Apparatus for ablating high-density array of vias or indentation in surface of object

[0002] This application is a continuation-in-part of Ser. No. 09/514,084 filed Feb. 28, 2000 which claims benefit of provisional No. 60/168,478 filed Oct. 8, 1999.

[0003] The present invention relates to a system for burning, drilling, or otherwise forming one or more desired vias, blind vias or other surface indentations, indicia, markings and/or other formations in a surface of a desired object, such as a substrate.

[0004] There are currently available a variety of systems for forming a hole, a via, a blind via or some other surface indentation in an exterior surface of an object, but many of these systems are very expensive to purchase and operate at relatively slow production rates.

[0005] Wherefore, the present invention seeks to overcome the above noted drawbacks of the prior art by providing a system which is relatively inexpensive to purchase and maintain while, at the same time, operates at increased production speeds so that the desired vias, blind vias, or other surface indentations, apertures or other surface markings can be achieved in a surface of a desired object during a shorter period of production time.

[0006] A further object of the present invention is to provide a method and apparatus for ablating a desired high-density array or pattern of vias or other surface indentations or formations in a surface of an object to be processed.

[0007] Another object of the invention is to facilitate use of a variety of different lasers which operate at different wavelengths and pulse durations, to minimize the associated costs in connection with ablating a high-density array of blind vias, vias or other surface indentations or formations in a surface of an object to be processed. It is to be appreciated that an ultraviolet, a visual, an infrared as well as other types of lasers, extending across the entire spectrum, could be utilized in accordance with the teaching of the present invention.

[0008] Yet another object of the present invention is to provide a method and apparatus which allows the number of vias or other indentations or formations, to be formed in a surface of an object being processed, to be easily varied during production of the same by control of the intensity and/or duration of a substantially collimated or non-collimated light beam emanating from the laser.

[0009] Still another object of the invention is to provide an apparatus which is relatively less inexpensive to purchase and operate, in comparison to other known systems, while still improving the production rates of the objects to be processed.

[0010] The present invention also relates to an imaging system for ablating a desired array of features in an object to be processed, the imaging system comprising: a laser for generating an outputting a coherent light beam; an X-axis and Y-axis automatic repeat position for redirecting a path of the coherent light beam; a focusing member for receiving the redirected light from the X- and Y-axis repeat positioners and focusing the coherent light beam at a desired one of a plurality of holographic imaging segments forming a holographic imaging lens; and each one of the holographic imaging segments, comprising the holographic imaging lens, forming a desired formation in a surface of the object to be processed.

[0011] The present invention also relates to an imaging system for ablating a desired array of features in an object to be processed, the imaging system comprising: a laser for generating an outputting a coherent light beam; at least one expansion lens for receiving the coherent light beam, outputted by the laser, and suitably altering a diameter of the coherent light beam; an X-axis and Y-axis automatic repeat position for redirecting a path of the coherent light beam; a focusing member for receiving the redirected light from the X- and Y-axis repeat positioners and focusing the coherent light beam at a desired one of a plurality of holographic imaging segments forming a holographic imaging lens; and each one of the holographic imaging segments, comprising the holographic imaging lens, forming a desired formation in a surface of the object to be processed; and a computer for controlling operation of one or more of the laser, the X- and Y-repeat positioners, the focusing member, the holographic imaging lens, and a position of the object to be processed to facilitate ablating a desired array of features in the object to be processed.

[0012] The present invention also relates to an imaging system for ablating a desired array of features in an object to be processed, the imaging system comprising: laser means for generating an outputting a coherent light beam; an X-axis and Y-axis automatic repeat positing means for redirecting a path of the coherent light beam; focusing means for receiving the redirected light from the X- and Y-axis repeat positing means and focusing the coherent light beam at a desired one of a plurality of holographic imaging means forming a holographic imaging lens means; and each one of the holographic imaging means, comprising the holographic imaging lens means, forming a desired formation in a surface of the object to be processed.

[0013] The invention will now be described, by way of example, with reference to the accompanying drawings in which:

[0014] FIG. 1 is a perspective view diagrammatically showing the entire system of the present invention;

[0015] FIG. 2 is an enlarged perspective diagrammatic view of FIG. 1 showing the laser image system according to the present invention;

[0016] FIG. 3 is a diagrammatic representation showing an X-axis and Y-axis automate repeat positioner, a collimating lens and a holographic lens which are combined as a single unit for use as the laser imaging system of the present invention;

[0017] FIG. 4 is a perspective view diagrammatically showing a mask for use with the laser imaging system of the present invention;

[0018] FIG. 5 is a diagrammatic transverse cross-sectional view of substrate having a plurality of different sizes blind vias formed therein by the laser imaging system of the present invention;

[0019] FIG. 6 is a diagrammatic perspective view of a second embodiment of the laser imaging system of the present invention;

[0020] FIG. 7 is a diagrammatic perspective view of a third embodiment the laser imaging system, according to the present invention, for forming indicia on either a stationary or a moving object to facilitate use of the laser imaging system as a typewriter;

[0021] FIG. 8 is a diagrammatic perspective view of a fourth embodiment the laser imaging system, according to the present invention, for forming a desired nozzle array on a stationary object;

[0022] FIG. 9 is a diagrammatic perspective view of a fifth embodiment of the laser imaging system, according to the present invention;

[0023] FIG. 10 is a diagrammatic perspective view of a sixth embodiment of the laser imaging system, according to the present invention;

[0024] FIG. 11 is a diagrammatic view showing peripheral components for use with the imaging system according to the present invention;

[0025] FIG. 12 is a diagrammatic perspective view showing a horizontal adjustment mechanism for the holographic imaging lens; and

[0026] FIG. 13 is a diagrammatic perspective view showing incorporation of the imaging system, according to the present invention, as part of a production line for processing a web.

[0027] Turning now to FIGS. 1-4, a detailed description of the imaging system 1 apparatus for ablating high-density array of vias or indentations in a surface of an object, according to the present invention, will now be provided. As can be seen in FIG. 1, a conventional laser 2 (only diagrammatically shown in this Figure) is employed for generating and outputting a laser beam 4. It is to be appreciated that the laser 2 can be either excimer or non-excimer laser and further details and operating parameters for the preferred laser, for use with the present invention, will be provided below. The laser beam 4, generated by the laser 2, is either an ultraviolet, a visible, an infrared, a coherent radiation beam or some other light radiation beam 4 which is supplied along a laser axis 6 toward at least a first expansion telescope or expansion lens 8 and also preferably then supplied to a second expansion telescope or expansion lens 10. The purpose of the expansion telescope or lens 8 and/or 10 is/are to suitably expand the diameter of the generated ultraviolet, visible, infrared or other light radiation laser beam 4 so as to have a desired resulting expanded laser diameter for the laser beam 4. As such expansion feature and teaching is conventional and well known in the art, a further detailed discussion concerning the same is not provided.

[0028] The expanded ultraviolet, visible, infrared or other light radiation beam 4 then continues, along the laser axis 6, and is directed at and impinges on a first reflective mirror 12 of an X-axis automated repeat positioner 14 of the system 1. The first reflective mirror 12 of the X-axis automated repeat positioner 14 controls the X-coordinate, along the surface 42 of the object to be processed O, at which the ultraviolet, visible, infrared or other light radiation laser beam 4 will be reflected. The first reflective mirror 12 suitably redirects or alters the path of substantially all of the ultraviolet, visible, infrared or other light radiation laser beam 4 and then reflects the laser beam toward a second reflective mirror 16, controlled by a Y-axis automated repeat positioner 18 of the system 1. The second reflective mirror 16, associated with the Y-axis automated repeat positioner 18, controls the Y-coordinate, along the surface 42 of the object to be processed O, at which the ultraviolet, visible, infrared or other light radiation laser beam 4 will be reflected. The expanded ultraviolet, visible, infrared or other light radiation beam 4 impinges on the second reflective mirror 16 and the second reflective mirror 16 suitably redirects or alters the path of the ultraviolet, visible, infrared or other light radiation laser beam 4 toward a rear surface 24 of a flat field collimating lens or some other refractive, detractive or holographic component 22, which is conventional and well known in this art.

[0029] Both the X-axis automated repeat positioner 14 and the Y-axis automated repeat positioner 18 are coupled to a computer 20 which controls the reflective positions of the first and second reflective mirrors 12 and 16, to suitably reflect and/or redirect the ultraviolet, visible, infrared or other light radiation laser beam at a desired impinging location along the rear surface 24 of the field collimating lens or holographic component 22. As such automated control feature of the X-axis and the Y-axis automated repeat positioners 14 and 18 is conventional and well known in the art, a further detail discussion concerning the same is not provided.

[0030] A suitable X-axis automated repeat positioner or a Y-axis automated repeat positioner 14 or 18 is sold by Cambridge Technology of Cambridge, Mass., as 6870M Optical Scanner Heads. It is to be appreciated that other currently available scanners or repeat positioners, which facilitate accurate reflecting and/or redirecting of a supplied laser beam, at a desired location of an X, Y coordinate system, could also be employed with the teaching of the present invention.

[0031] The reflected ultraviolet, visible, infrared or other light radiation laser beam 4′ enters the rear surface 24 of the field collimating lens or other holographic component 22, passes therethrough and is suitably altered in a conventional manner by the inherent characteristics of the field collimating lens or other holographic component 22 so that the ultraviolet, visible, infrared or other light radiation laser beam which is emitted from the front surface 26 of the field collimating lens or other holographic component 22 is a substantially collimated beam 28. This substantially collimated beam 28 is emitted and directed, by the front surface 26 of the field collimating lens or other holographic component 22, toward a desired area or portion of a rear surface 30 of a holographic imaging lens 32 and strikes and impinges on that desired area or portion.

[0032] The holographic imaging lens 32 is designed such that as the light enters by way of the rear surface 30 of one of the holographic imaging segments 36, the light will be focused, by that holographic imaging segment 36 of the holographic imaging lens 32, at a desired location or locations along a top surface 42 of the object to be processed O. The top surface 42 of the object to be processed O is located at a desired working distance D, for example, between 5 mm and 1000 mm, and preferably between about 200 to 300 mm from the front surface 38 of the holographic imaging lens 32. The altered light is emitted from the front surface 38 of the holographic imaging lens 32 as focused light beam 43.

[0033] This focused light beam 43 is directed at a desired location or locations-depending upon the inherent characteristics of the holographic imaging segment 36, along the top or other desired surface 42 of the object to be processed O for drilling, burning or otherwise forming a desired blind via(s), aperture(s), opening(s), indicia, indentation(s) or other surface formation(s) 44 therein of a desired size and a desired depth. It is to be appreciated that the size of the formation(s) 44 is determined and/or defined by the design characteristics of each holographic imaging segment 36 of the holographic imaging lens 32. In addition, the depth of the formation(s) 44 is a direct function of the duration or amount of pulses of the laser 2 emitted at the top surface 42 of the object to be processed. That is, the longer the duration or greater of the number of pulses of the laser 2, the greater the depth of the desired blind via(s), aperture(s), opening(s), indicia, indentation(s) or other surface formation(s) 44 in the object to be processed O, while the shorter the duration or the smaller the number of pulses from the laser 2, the smaller the depth of the desired blind via(s), aperture(s), opening(s), indicia, indentation(s) or other surface formation(s) 44 in the object to be processed O. As diagrammatically shown in FIGS. 1 and 2, the focused laser beam 43 is shown drilling, burning or otherwise forming a desired formation(s) 44, such as a blind via, in the top surface 42 of the object to be processed O.

[0034] An important distinction between the present invention and the prior art is that X-axis and the Y-axis automated repeat positioner 14, 18 are particularly adapted to reflecting the laser beam at only selected or desired rear area or areas of the holographic imaging lens 32, not the entire rear surface of the holographic imaging lens 32. As is conventionally done in the prior art, the scanners are employed to scan the laser beam across the entire rear surface of the holographic imaging lens, not only at a selected area or areas, as achieved by the present invention.

[0035] With reference to FIG. 3, a X-axis, Y-axis automated repeat positioner, collimating lens and holographic unit combined assembly 37 can be seen. The X and Y-axis automated repeat positioners are generally designated as 14, 18, the collimating lens or other holographic component 22 is located beneath the automated positioners, and the holographic imaging lens 32 is located to receive the collimated light from the collimating lens or other holographic component 22. The arrangement results in a compact design for the main components of the imaging system 1 of the present invention.

[0036] As can be seen in further detail in FIG. 4, the holographic imaging lens 32, according to the present invention, is partitioned into a plurality of desired separate holographic imaging segments 36 and each holographic imaging segment 36 is designed to form, burn or drill at least one, and possibly two or more, desired size via, blind via, hole, aperture, indicia, indentation, feature or other formation 44 in the top surface 42 of the object to be processed O. The holographic imaging lens 32, as shown in FIGS. 1, 2 and 4, is partitioned into thirty-six (36) different holographic imaging segment 36 and each holographic imaging segment 36 is designed to form, according to the first embodiment, a corresponding blind desired blind via(s), aperture(s), opening(s), indicia, indentation(s) or other surface formation(s) 44 in the top surface 42 of the object to be processed O.

[0037] It is to be appreciated that the number of holographic imaging segments 36, being incorporated into the holographic imaging lens 32, can vary from application to application. Further, the number of desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44, to be formed by each holographic imaging segment 36, can be vary from application to application. Accordingly, the holographic imaging lens 32, according to the present invention, can be designed to drill, form or otherwise burn only a few or many tens of thousands of desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 in the desired object to be processed O. The important feature, according to the present invention, is that all the holographic imaging segments 36 are arranged and located closely adjacent one another so as to all lie in the same plane P, which plane extends parallel to the top surface 42 of the object to be processed O, so as to be readily illuminated with the focused light beam 43.

[0038] The holographic segments 36 are either glued or otherwise are affixed to one another in a conventional manner or a perimeter retaining ring or some other retaining member encases and maintains the holographic segments in their close adjacent planar relationship. Alternatively, the holographic imaging lens 32 can be formed from a single unitary piece of material and each holographic segment can be designed to form the desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44.

[0039] According to the present invention, the X-axis and the Y-axis automated repeat positioners 14 and 18 are controlled by the computer 20, or other automated system to select the desired area or portion of the rear surface 24 of the field collimating lens or other holographic component 22 to be illuminated by the substantially collimated beam 28. The substantially collimated beam 28 passes through the field collimating lens or other holographic component 22 and emanates from a front surface 26 thereof toward the rear surface of a desired one of the holographic imaging segments 36 of the holographic imaging lens 32. The substantially collimated beam 28 strikes a desired area or portion, within the desired holographic imaging segment 36, and the substantially collimated beam 28 is focused, in a conventional manner, by the holographic imaging segment 36 to result in the focused beam 43 which facilitates drilling, burning, or formation of the desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 in the top surface 42 of the object to be processed O.

[0040] The holographic imaging lens 32, which comprises a plurality of holographic imaging segments 36, can be obtained from a variety of sources such as, for example, Diffraction Ltd. of Waitsfield, Vt., Digital Optics Corporation, of Charlotte, N.C., MEMS Optical, LLC. of Huntsville, Ala. and Rochester Photonics Corp. of Rochester, N.Y.

[0041] It is to be appreciated that if a total of thirty-six (36) holes or formations 44 were to be formed in the top surface 42 of the object to be processed O, as shown in FIGS. 1 and 2, each one of the holographic imaging segments 36 of the holographic imaging lens 32 would be designed to form a single desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 and be sequentially illuminated with the substantially collimated beam 28, in a desired sequential illumination order, for a desired number of pulses or a desired pulse duration. Alternatively, if only some desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 are required to be burned, drilled or formed in the top surface 42 of the object to be processed O, but other desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 are not required, only the holographic imaging segments 36 which are designed to form the desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 in the top surface 42 of the substrate to be processed O are illuminated with the substantially collimated beam 28 while the holographic imaging segments 36, which would form the unwanted blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 in the top surface 42 of the substrate to be processed O, are not illuminated with the substantially collimated beam 28.

[0042] The holographic imaging lens 32, as can be seen in FIG. 4, essentially comprises a plurality of separate holographic imaging lens or segments 36 which are all located closely adjacent one another, in a desired orientation and all lying substantially in the same plane P to form a continuous unitary component. This arrangement facilitates a compact design of the holographic imaging lens 32 and allows the system to selectively and readily control which holographic imaging segment or segments 36, of the holographic imaging lens 32, are activated during production of a desired substrate or object to be processed O via appropriate control of the X-axis and the Y-axis automated repeat positioners 14 and 18. Such construction provides the system, according to the present invention, with greater flexibility and allows variation in the amount and location of the desired blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44 to be formed, burnt or drilled in the top surface 42 of object to be processed O during commercial production of the same.

[0043] With reference to FIG. 5, an example of an object to be processed O can be seen. As shown in this Figure, the object to be processed O contains a base layer 50 which comprises, for example, a standard metal such as aluminum, copper, gold, molybdenum, nickel, palladium, platinum, silver, titanium, tungsten, metal nitrides or a combination(s) thereof. The thickness of the metal base layer 50 may vary but typically ranges between about 9 to about 36 μm and may be as thick as about 70 μm. The top layer 52 comprises, for example, a standard organic dielectric materials as BT, cardboard, cyanates esters, epoxies, phenolics, polyimides, PTFE, various polymer alloys, or combinations thereof. The thickness of the top layer 52 is generally thicker than the base layer 50 and typically ranges between about 50 to about 200 μm.

[0044] As can be seen in FIG. 5, a plurality of blind vias 46 are formed therein and some of the blind vias 46 can have different diameters. As noted above, the diameter of the blind vias 46 are determined by the focusing characteristics of the holographic imaging lens 32, e.g. the holographic imaging lens focuses the supplied collimated light beam 28 over a wider area to achieve larger diameter blind via and focuses the light over a narrower area to achieve narrower diameter blind via. In both cases, it is to be appreciated that the duration or number of pulses are controlled by the imaging system 1 to insure that the entire top layer 52 of the object to be processed O is obliterated to thereby expose the underlying metal base layer 50 while being of a substantially short enough intensity and duration so as not to in any way destroy or obliterate the underlying base layer 50.

[0045] It is to be appreciated that a variation of the holographic imaging lens, as shown in FIG. 6, can be substituted in place of the field collimating lens 22. If a collimating holographic imaging lens 22′ is employed as the field collimating lens, then the collimating holographic imaging lens 22′ is designed so as to receive light from the X-axis and the Y-axis automated repeat positioners 14 and 18 and redirect the supplied ultraviolet, visible, infrared or other light radiation laser beam 4, as a substantially collimated beam 28, at a desired rear surface of one of the holographic imaging segments 36 of the holographic imaging lens 32 . The collimating holographic imaging lens 22′ is designed to collimate the supplied light beam and redirect the beam 4′ light toward the holographic imaging lens 32 so that the substantially collimated beam 28 enters the rear surface of the holographic imaging lens 32 at an angle of about of between about 0° to about 90° or some other predetermined angle depending upon the design parameters of the imaging system 1.

[0046] The inventors have appreciated that if the substantially collimated beam 28, supplied by the field collimating lens or other holographic component 22, is redirected at the rear surface of the holographic imaging lens 32 at an angle of about 45° or so, the efficiency of the holographic imaging lens 32 is significantly increased over the efficiency when the substantially collimated beam 28 is redirected at the rear surface of the holographic imaging lens 32 at an angle of about 90°. That is, the efficiency of the holographic imaging lens 32 is less when the substantially collimated beam 28 enters the rear surface of the holographic imaging lens 32 at an angle of about 90° while the efficiency increases if the substantially collimated beam 28 enters the rear surface of the holographice imaging lens 32 at a suitable angle of about between 0° and 90°. Accordingly, thee desired angle in which the substantially collimated beam 28 enters the rear surface of the holographic imaging lens 32 can vary, from application to application, and can be determined by trial and error depending upon the parameters of the imaging system 1. Therefore, by using a collimating holographic imaging lens as the field collimating lens 22, the overall efficiency of this system can be increased without changing or modifying any of the other system requirements or parameters.

[0047] Turning now to FIG. 7, the holographic imaging lens 32 can be designed to result essentially in a holographic imaging keyboard 32Δ, e.g. there can be twenty-six (26) holographic imaging segments 36Δ with each holographic segment being designed to form, burn or drill a one of the 26 letters of the alphabet, an additional ten (10) holographic imaging segments 36Δ with each additional holographic segment being designed to form, burn or drill one number from zero through 9, and a further plurality of holographic imaging segments 36Δ with each further holographic segment being designed to form, burn or drill desired punctuation, indicia, emblem, design logo, etc. By operation of the laser (not shown in this Figure) and adequately controlling of the X-axis and the Y-axis automated repeat positioners 14, 18, via the computer 20 as described above, the ultraviolet, visible, infrared or other light radiation laser beam 4 can be suitably collimated and supplied at a rear surface of a desired one of the holographic imaging segments 36Δ of the holographic imaging keyboard 32Δ to type, drill or form a desired letter, numeral, indicia, etc., in a top surface of an object to be processed, e.g. a cable or wire 51 running at high speed which is to have a desired marking, such as “A 0903C”, formed in an exterior surface thereof.

[0048] According to this embodiment, each image or other indicia to be formed by the holographic imaging keyboard 32Δ is focused by an appropriated one of the holographic imaging segments 36Δ, once that segment is struck with the supplied ultraviolet, visible, infrared or other light radiation laser beam 4, to form the desired indicia at the same area or “printing location” 53. Accordingly, during operation of the imaging system 1, as a cable or wire 51, for example, moves past the “printing location” 53, the X-axis and the Y-axis automated repeat positioners 14, 18 are controlled by the computer 20 to select the desired one of the holographic imaging segment(s) 36Δ so as to type, burn, drill or form a desired letter, numeral, character, indicia, etc., in an exterior surface 54 of the wire 51 or other object as the wire 51 moves past the “printing location” 53. It is to be appreciated that the system, according to the present invention, incorporating the holographic imaging keyboard 32Δ operates at a very high speed such that the desired letter, numeral, character, indicia, etc., are essentially printed in sequential order, one after the other, to result in a desired imprinted pattern, e.g. “A 0903C”, on the wire 51.

[0049] Instead of using alphanumeric characters for the keyboard, each segment 36Δ can be provided with suitable light altering information for forming a desired bar code or other convention and when known marking indicia on an exterior surface of an object as it moves relative to the imaging system 1 or remains stationary at the “printing location” 53. As such teaching is conventional and well known to those skilled in the art, a further detailed description concerning the same will not be provided.

[0050] The above described embodiment is particularly useful for marking alpha-numeric characters at a rate that is approximately double the rate of any known marking system currently available on the market. The imaging system 1 uses a specially designed segmented array to create the required surface marks, which may be, for example, bar codes, letters, numbers, punctuation marks, logos, foreign characters, etc. This segmented array is designed to image every character of the array at the same location while the object or component, requiring the surface marking, is suitably moved or indexed relative to the printing zone or location 53 so as to mark the desired bar code(s), letter(s), number(s), punctuation mark(s), logo(s), foreign character(s), etc., in the exterior surface of the object or component.

[0051] A further application of the imaging system 1, according to the present invention, is to for use with marking different fiber materials with a code or code identifying or designating a specific production batch number(s), date(s), production facility, and other desired information that would be helpful or beneficial to a forensic investigator(s) when investigating a crime scene or when explosives have been used. Such small fibers can be made from a host of materials such as Kevlar®, carbon, glass, quartz, stainless steel, plastic, etc. The imaging system 1, according to the present invention, will allow these fibers to be effectively processed or marked, at extremely low costs and at a high speed, to assist with identification.

[0052] A further application of the present invention is two-dimensional bar code marking at high speed. The imaging system 1, according to the present invention, can be configured to provide high speed production marking of two-dimensional bar codes onto a either a stationary or a moving surface of a product or object. The system's segmented lens array can be used to image a series or group of associated indentations or other surface markings that can be formed into a two-dimensional bar code or other indicia that can be read using standard optical character recognition software. This method and system for marking is similar to the way the present invention drills, burns or forms the holes of a nozzle array except the system will only sufficiently mark the top surface to form the desired two-dimensional bar code character or other indicia. It is to be appreciated that a plurality of closely arranged and aligned indentations or surface marks will comprise or form each desired bar code(s), letter(s), number(s), punctuation, mark(s), logo(s), foreign character(s), etc. The imaging system 1 offers an extremely high rate marking capability that is currently not available by prior art marking systems.

[0053] It is to be appreciated that the imaging system 1, of the present invention, can be used to perforate a plurality of small orifices or holes (see FIG. 8), in a single or a multi-layered material, to enable the formation of a desired nozzle array for use in forcing a liquid (e.g. a perfumed, a solvent, a pharmaceutical, a chemical, etc.) therethrough to result in a desired spray configuration or pattern. The force fluid, upon exiting from the nozzle array, is atomized into small minute particles and dispersed in a desired spray configuration at a target. The imaging system, according to the present invention, allows the formation of such orifices, nozzles, holes, etc., in a variety of different materials including, but not limited to, stainless steel, polyimide, lexan, brass, molybdenum, copper, aluminum, etc, for example.

[0054] The present invention is also well-suited for forming a set of miniature surface markings on an interior surface adjacent a breech end of a gun barrel of a firearm. In particular, the present system can be employed to form a desired unique bar code, matrix, an alpha numeric code, or any desired identifying indicia on an inner surface of the firearm, adjacent the breech end of the gun barrel. Once the gun barrel is suitably processed or marked with the identifying indicia, when the firearm is discharged in a conventional manner, the loaded gun shell normally expands slightly, due to the gunpowder within the gun shell instantaneously igniting and heating the gun shell. This rapid expansion of the gun shell causes the exterior surface of the gun shell to be forced against the inwardly facing surface adjacent the breech end of the gun barrel such that the identifying indicia, formed on the inwardly facing surface of the breech end of the gun barrel, forms a mating or matching impression or marking on the exterior surface of the gun shell. Upon discharge of the gun shell from the gun barrel, this matching impression or marking facilitates identifying which gun shell was discharged from which gun barrel. Such marking of the gun shell assists ballistics experts with confirming that a particular gun shell was discharged from a particular barrel of a firearm. If desired, a plurality of identical miniature surface markings can be formed, at spaced locations about the interior surface adjacent the breech end of a gun barrel of a firearm, to make it more difficult for an end user to located and completely remove all of such miniature surface markings from the interior surface of the breech end of the gun barrel so processed or marked.

[0055] It is to be appreciated that a plurality of identical imaging systems 1, each similarly to any one of the above described embodiments, can be simultaneously used in combination with one another to form, drill or burn a desired matrix of features in the same object to be processed O. Further, it is to be appreciated that there are a variety of different arrangements that could be utilized to move the object to be processed O relative to the focused beam 43. For example, the object O, the field collimating lens other holographic component 22, and the holographic imaging lens 32 can all be mounted on a table 56 which is movable in the X-axis and the Y-axis directions and coupled to the computer 20 for controlling movement of the table 56 relative to the focused beam 43 (FIG. 9). Alternatively, the X-axis Y-axis repeat positioner 14, 18 can be replaced with a single mirror mounted on a table 12′ and movable in both the X- and Y-axis directions (FIG. 10). This table 12′ is also coupled to the computer 20 and appropriately moves to redirect the light beam 4 to a desired rear surface of the field collimating lens other holographic component 22 to facilitate illumination of a desired one of the holographic imaging segments 36. As such teaching in conventional and well known in the art, a further detailed description concerning the same is not provided.

[0056] With reference to FIG. 11, an embodiment is shown in which the entire imaging system 1 is diagrammatically housed within an enclosure 62. The enclosure 62 also accommodates the computer 20 which is coupled, as described above, to control operation of the imaging system 1. In addition, a monitor 64 as well as a keyboard 66 are coupled to the computer 20. The keyboard 66 facilitates inputting of a desired command(s), by an end user, to the computer 20 for controlling operation of the imaging system 1 and the monitor 64 facilitates viewing of any such entered command(s) as well as viewing of any warnings, error(s), messages, instructions, queries, data, information, etc., to be displayed by the imaging system 1. Computer software 68 is incorporated, in a conventional manner, into the computer 20 which facilitates operation and control of the laser 2 and the X-axis and Y-axis automated repeat positions 14, 18 as well as controlling relative movement between the object to be possessed O a remainder of the imaging system 1.

[0057] The support frame 72 generally comprises four legs or sides 74 (only two of which are shown in FIG. 11) which facilitates supporting a top working surface 76 at a desired distance from a floor or ground surface 78. As can be seen in FIG. 11, all of the components of the imaging system 1 are housed within the enclosure 62 which is suspended, at a fixed location by additional framework 80, a desired working distance D above a central area of the working surface 76. A desired object to be processed or marked 82 with blind via(s), aperture(s), opening(s), indicia, indentation(s), feature(s) or other surface formation(s) 44, e.g. a flexible coated or uncoated web, can be unwound and dispensed via conventional web dispensing equipment 84 and conveyed across the working surface 76 of the imaging system 1 of the present invention. As the desired object to be processed or marked 82 is conveyed across the working surface 76, the top surface of the desired object to be marked 82 is suitably marked, e.g. formed, burnt or drilled, with the desired blind via(s), aperture(s), opening(s), indicia(s), indentation(s), feature(s) or other surface formation(s) 44.

[0058] Following such marking, the processed object to be marked 82 is then rewound by conventional rewinding equipment 86 and ultimately conveyed, in a known manner, to other operation(s) for further processing. It is to be appreciated that the dispensing equipment 84 and the rewinding equipment 86 are both coupled to the computer 20, via conventional electrical couplings, to facilitate control of either uniform sequential indexing or continuous feed, of the desired object to be processed or marked 82, at a desired processing speed along the working surface 76 of the imaging system 1 to facilitate marking of the desired object to be processed or marked 82 at a desired production rate.

[0059] In a preferred form of the present invention, the holographic imaging lens 32 is supported by a holographic imaging array plate 87 which is mounted by a horizontal adjustment mechanism 88 (FIG. 12) to facilitate aligning the horizontal plane P of the holographic imaging lens 32 so that this horizontal plane is position exactly parallel with the top working surface 76 of the imaging system 1. To facilitate such alignment, preferably one corner portion of the holographic imaging lens 32 is fixedly mounted 90 to the enclosure 62 (not shown in detail) but that corner is allowed to pivot relative thereto. Each of the three other corners or portions of the holographic imaging lens 32 are also supported by a separate linear actuator 92. Each one of these three linear actuators 92 is coupled to a mating position sensor feedback device 94 and all of the linear actuators 92 and their associated position sensor feedback devices 94 are coupled to the computer 20 to facilitate controlling operation of those components.

[0060] Prior to processing of the desired object by the imaging system 1, the computer 20 sequentially actuates each one of the imaging segments 36, comprising the holographic imaging lens 32, to confirm that the working distance D between the holographic imaging lens 32 and the working surface 76 of the imaging system 1 are correctly positioned and/or that the holographic imaging lens 32 is aligned exactly parallel with respect to the working surface 76. In the event, that any adjustment of the holographic imaging lens 32 relative to the working surface 76 of the imaging system 1 is required, a suitable one or ones of the linear actuators 92 is/are supplied with electrical power to operate an internal drive (not shown in detail) in a first direction to raise that end portion of the holographic imaging lens 32, along a Z-axis extending perpendicular to the working surface 76, by a suitable distance, or in an opposite direction, along the Z-axis extending perpendicular to the working surface 76, to lower that end portion of the holographic imaging lens 32 by a suitable distance. Once this occurs, the computer 20 then again actuates each one of the imaging segments 36 to verify whether on not the holographic imaging lens 32 is properly horizontally aligned with the working surface 76. This alignment procedure continues until the computer 20 determines that the holographic imaging lens 32 is suitably horizontally aligned with respect to the working surface 76.

[0061] With reference to FIG. 13, incorporation of the imaging system 1, according to the present invention, as a component and incorporated in part of a production line, will now be briefly described. As can be seen in FIG. 13, an uncoated web 96 is initially manufactured by a conventional process and wound a core 98. The core 98 is supported by conventional dispensing or unwinding equipment 100 to facilitate unwinding of the uncoated web 96 in a uniform manner. During operation, the uncoated web 96 is transported, as is typical in this art, over a plurality of spaced rollers (not numbered) and fed into an inlet of a coater 102 where a suitable coating, e.g. powder, metal deposition, dielectric deposition, is applied to either one or both opposed surfaces of the uncoated web 96. The thus coated web 103 is then conveyed through an oven 104 where the heat emitted from the oven facilitates adhesion of the powder coating to one of both surfaces of the coated web 103.

[0062] Next, the coated web 103 is conveyed over a plurality of spaced rollers (not numbered) and fed across the working surface 76 of the imaging system 1, according to the present invention, where the desired blind via(s), aperture(s), opening(s), indicia(s), indentation(s), feature(s), or other surface formation(s) 44 are formed, burnt or drilled, as described above, in the top surface 42 of the coated web 103. Finally, the coated and appropriated processed or marked coated web 105 then passes over a plurality of spaced conventional rewind rollers (not numbered), to facilitate proper rewinding of the coated and appropriated processed or marked coated web 105, and is wound on a rewound core 106 by conventional rewind equipment 108. The rewound core 106 of suitably coated and appropriated processed or marked web 105 can then be further processed, as required by conventional equipment in a known manner.

[0063] In a preferred form of the invention, a machine vision camera 112 (only diagrammatically depicted in FIG. 13) is coupled to the computer 20 of the imaging system 2, via a conventional cable 114, for observing the object to be processed O to view the drilling, burning, and/or formation of the desired blind via(s), aperture(s), opening(s), indicia(s), indentation(s), feature(s), or other surface formation(s) 44 in a desired surface of the object to be processed O. Once the desired blind via(s), aperture(s), opening(s), indicia(s), indentation(s), feature(s), or other surface formation(s) 44 are formed, burnt or drilled in the object to be processed O by the imaging system 2, the object to be processed O can then be further manipulated by the production line, e.g. be rewound on a core, can be package or further conveyed, etc., depending upon the particular application. The computer 20 is typically electrically connected, by a cable 116 and 118, to motors (not shown) which control drive of the dispensing or unwinding equipment 100 and the rewinding equipment 108 for controlling further manipulation or manufacturing, inspection, transportation, processing, sorting, orientation, etc., of the object to be processed O As such teaching is well known in the art and as the present invention primarily relates to the imaging system 2, a further detailed description concerning the machine vision camera 112 and its associated components are not provided.

[0064] Suitable lasers, for use with the present invention, will now be briefly discussed. The present invention contemplates use of a variety of different lasers such as a slow flow CO2, CO2 TEA (transverse-electric-discharge), Impact CO2, and Nd:YAG, Nd:YLF, and Nd:YAP and Nd:YVO and Alexandrite lasers. In addition, it is to be appreciated that the imaging system 1, according to the present invention, can utilize all other forms of lasers including gas discharge lasers, solid state flash lamp pumped lasers, solid state diode pumped lasers, ion gas lasers, and RF wave-guided lasers. The above identified lasers are currently available on the market from a variety of different manufacturers.

[0065] As used in the appended claims, the term “coherent light beam” is intended to cover ultraviolet, visible, infrared, and/or other types of known light radiation beams employed to form a desired formation in a surface of the object to be processed.

[0066] It is to be appreciated that the present invention is applicable to both collimated light as well as non-collimated light.

[0067] Since certain changes may be made in the above described method and system, without departing from the spirit and scope of the invention herein involved, it is intended that all of the subject matter of the above description or shown in the accompanying drawings shall be interpreted merely as examples illustrating the inventive concept herein and shall not be construed as limiting the invention.