Lamp and Lamp Base Assembly

The present invention relates to electric lamps and in particular to electric lamps used in automobiles. More in particular, the present invention concerns automotive headlamp capsules and inexpensive ways of constructing adjustable mountings for the light source.

It is known to provide lamp assemblies which generally include a lamp coupled to a lamp base assembly. Typically, such a lamp base assembly includes a one piece base which has either a straight base design or an angled base design, such as a right angle base. In a straight base design, such as the type typically used in automotive headlamps in the United States, the base extends in a direction of the lamp axis. In a right angle base, such as the type typically used in automotive headlamps in Europe, the base includes a connector segment which extends at a right angle relative to the lamp axis. In addition to the existence of straight and angled bases, lamp base assemblies are designed for use with a specific type of lamp. In particular, each lamp design will typically require a specific mounting structure at the lamp base assembly to which the lamp is to be coupled.

It is costly for lamp manufacturers to produce and inventory such various alternative lamp bases. For example, heretofore it has been necessary to produce and inventory straight lamp bases and ninety degree lamp bases as well as different lamp bases for use with different types of lamps. In addition, lamp bases heretofore produced have typically been fabricated from a material designed to withstand the temperature of the lamp with which the base is to be used. One problem associated with this requirement is that lamps having very high temperatures typically require the use of more expensive high temperature plastic material. Other expenses incurred due to the need to provide a large range of base types relate to the need to provide multiple types of equipment, and multiple processing techniques, having various specifications.

In addition to the foregoing, the designs of lamp base assemblies heretofore provided inherently have very cramped physical features which cause undesirable space constraints. Such constraints provide difficulties when focusing a lamp being attached to the lamp base assembly. In some designs, such focusing problems result from the orientation of the welds during, for example, laser welding of the lamp leads to the contacts located within the lamp base.

It is an object of the present invention to provide an improved lamp base assembly for use with a lamp.

Another object of the present invention is to obviate the disadvantages of the prior art by providing an adjustable lamp base assembly.

A further object of the present invention is to provide an improved and cost efficient lamp base assembly.

Another object of the present invention is to provide a lamp base assembly which may be readily adjusted during assembly.

The present invention achieves these and other objects by providing a lamp base assembly which comprises separate first and second base components attached together. The first base component comprises a first portion structured and arranged for attachment to a lamp and an opposite second portion structured and arranged for attachment to the second base component. The separate second base component includes pins having heads that the first base component may be adjusted and welded to. A third portion may be structured and arranged for attachment to the second portion and a fourth portion comprising contacts structured and arranged for mechanical and electrical connection with (a) lead wires of the lamp and (b) a connector. The second base component may be a straight base component or an angled base component.

A lamp including each lamp base assembly of the present invention is also provided.

This invention may be clearly understood by reference to the attached drawings in which like reference numerals designate like parts and in which:

FIG. 1 is an exploded perspective view of one embodiment of the present invention illustrating two alternative lamp base assemblies;

FIG. 2 is a perspective view of one lamp base assembly of FIG. 1;

FIG. 3 is a perspective view partially in section of another lamp base assembly of FIG. 1;

FIG. 4 is an exploded perspective view of another embodiment of the present invention;

FIG. 5 is an enlarged perspective view of a portion of the embodiment of FIG. 4;

FIG. 6 is an exploded perspective view of a further embodiment of the present invention illustrating two other alternative lamp base assemblies;

FIG. 7 is a perspective view of one lamp base assembly of FIG. 6;

FIG. 8 is a cross-section of FIG. 7 taken along lines 8--8;

FIG. 9 is a cross-section of FIG. 7 taken along lines 9--9;

FIG. 10 is an enlargement of a portion of FIG. 8 rotated 180.degree.;

FIG. 11 is a bottom view of FIG. 7; and

FIG. 12 is a cross section similar to FIG. 8 of another lamp base assembly of FIG. 6.

For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.

The lamp base assembly of the present invention includes a base which comprises a base mounting portion structured and arranged for attachment to any one of a plurality of differently configured attachment members. For example, in the embodiment illustrated in FIG. 1, a lamp base assembly 20 is provided which comprises a base 22 having contacts 24 therein. Contacts 24 include respective ends 26 and 28. Contacts 24 are structured and arranged for mechanical and electrical connection of ends 26 with lead wires 30 of a lamp 32 when the lamp is coupled to the lamp base assembly 20. Contacts 24 are also structured and arranged for mechanical and electrical connection of ends 28 with contacts 34 of a mating connector 36 in a conventional manner. The base 22 of the lamp base assembly 20 includes a base mounting portion 38 which is structured and arranged for attachment to attachment member or nose 40 or alternatively to attachment member or nose 42. In the embodiment illustrated in FIG. 1, the attachment members 40 and 42 provide two different structural configurations either one of which may be attached to the base 22.

In the embodiment illustrated in FIG. 1, the attachment members 40 and 42 each comprises a respective cup-shaped element 44, 44' attachable to the base mounting portion 38, and a respective mounting element 46, 46' attachable to a lamp retainer 48. The base mounting portion 38 includes a recess 50 which comprises a substantially cylindrical inner wall 52 which extends in the direction 54 of a base axis 56.

In the embodiment illustrated in FIGS. 1 and 2, the cup-shaped element 44 may be fabricated from a high temperature plastic material such as Amoco Amodel 1145, and the base 22 may be fabricated from a low temperature plastic material such as valox 425. Element 44 comprises an outer peripheral partially cylindrical surface 58. The element 44 also includes a flange 60 having a diameter greater than the diameter of the partially cylindrical surface 58, and a flange 62 having a diameter greater than the diameter of flange 60. In assembling the lamp base assembly 20, the element 44 is inserted into the recess 50 until the flange 60 engages the base mounting portion 38 as illustrated in FIG. 2. Essentially, the surface 58 will mate with and engage the inner wall 52 of the recess 50. As will be apparent from FIG. 2, the surface 64 of the flange 62, the outer peripheral surface 66 of the flange 60 and the surface 68 of the base mounting portion 38 will form a groove 70 into which a gasket, O-ring and the like (not shown) may be inserted to provide a seal for use with the lamp base assembly 20 in a conventional manner. The base 22 and cup-shaped element 44 may be coupled together by ultrasonic welding or by screws and the like. The configuration of the groove 70 is essentially flash-free.

In the embodiment illustrated in FIG. 1, the mounting element 46 of the attachment member 40 comprises a cylindrical segment 72. The mounting element 46 also comprises at least one surface extending in a radial direction relative to the axis of the cylindrical segment 72. For example, in the embodiment illustrated in FIG. 1, the mounting element 46 includes a plurality of surfaces in the form of legs 74 which extend radially relative to the axis of the cylindrical segment 72. The diameter of the cylindrical segment 72 is equal to or slightly less than the diameter of a recess 76 of the cup-shaped element 44. The cylindrical segment 72 is force fit into the recess 76 and the legs 74 engage an upper surface 78 of element 44.

In the embodiment illustrated in FIGS. 1 and 3, the cup-shaped element 44' is similar to the cup-shaped element 44. In particular, element 44' comprises an outer peripheral partially cylindrical surface 58' which is inserted into the recess 50 in the same manner in which the element 44 is inserted into recess 50. Element 44' differs from element 44 to the extent that element 44' is structured and arranged for attachment thereto of a mounting element which differs from mounting element 46. In particular, the element 44' includes a plurality of recesses 80 into which respective pins 82 are inserted. The heads 84 of pins 82 collectively form mounting element 46'. Pins 82 may be stainless steel spiral drive pins, and may be in the form of Type U metallic drive screws manufactured by Parker-Kalon. The preferred pins have heads 84 with spherical sections. When in position, FIG. 3, the heads 84 are tangent to a plane defined by a surface on the lamp retainer 48, such as by the wings 92. The wings 92 can then be adjusted in this plane with respect to the heads 84. Use of such screws eliminates the need for the element 44' to have a metal piece to receive the pins. In particular, such screws may be pressed into recesses 80.

In the embodiment illustrated in FIG. 1, lamp retainer 48 includes a stainless steel first segment 88 attachable to the mounting elements 46 or 46' and a second segment 90 attachable to the first segment 88 and to lamp 32.

With reference to FIGS. 1 to 3, the segment 88 includes identical wings 92 which extend from opposing walls 94, in a radial direction relative to an axis of the segment 88. During assembly of the lamp base assembly illustrated in FIG. 2, the bottom surface of each wing 92 engages the upper surface of respective legs 74. During the assembly of the lamp base assembly of FIG. 3, the bottom surface of the wings 92 engages the upper surface of a respective head 84. In order to provide proper focusing to enhance the beam pattern of the lamp 32 being attached to the lamp base assembly 20, the segment 88 may be adjusted in a focusing mode relative to the attachment member 40, 42 by sliding the wings 92 in an X-Y plane upon the legs 74, or heads 84, as the case may be, in any direction transverse to axis 56. When focusing in such X-Y plane is achieved, the wings 92 may be welded to the legs 74, or heads 84, at welds 98. In the embodiment illustrated in FIG. 3, with several pins 82 welded to a common piece, each pin 82 is then prevented from rotating out of position by the other pins 82.

With reference to FIGS. 1 to 3, the segment 88 includes legs 100 which extend away from the wings 92. Segment 90 includes legs 102. Legs 100 and 102 may be structured and arranged such that respective outer surfaces 104 of legs 100 are spring biased against respective inner surfaces 106 of legs 102 to hold the segment 90 in place relative to the segment 88. In order to further provide proper focusing of the lamp 32 to be attached to the lamp base assembly 20, the segments 88 and 90 may be adjusted relative to each other in a focusing mode by sliding the inner surfaces 106 of legs 102 upon the outer surfaces 104 of legs 100 in a direction of a retainer axis (Z plane), such retainer axis extending in direction 54 when the segment 88 has been attached to the mounting element 46, 46'. When the focusing in such Z-plane is achieved, the legs 100 may be welded to respective legs 102 at 108. It will be noted that the segment 88 is substantially rectangular. Such a configuration allows for positioning the welds 108 relatively close to the axis 56 which allows for optimum translational movement of segment 88 during focusing. The two segment lamp retainer 48 allows for 5-axis laser welding of the retainer thereby providing substantially improved focussing tolerances. By providing a lamp such as, for example, lamp 32 with molybdenum lead wires 30, flexing of the lead wires and movement of the capsule during the 5-axis focusing process is facilitated. This feature is important since such flexing will eliminate any undesirable internal forces remaining caused by the lead wires acting on the lamp 30/segment 90 interface. Such forces are undesirable since they tend to impart excess stress in the glass lamp press and cause lamp explosions.

The manner in which the base contacts are connected to the lamp lead wires is illustrated with respect to the embodiment depicted in FIG. 3 and is equally applicable to the embodiments illustrated in FIGS. 2, 4 and 5. With reference to FIG. 3, contacts 24 are brass, and lead wires 30 are nickel plated. Contacts 24 are electrically and mechanically connected to respective lead wires 30 of lamp 32 by resistance welding at 110. Such welding may be effected through an opening 112 which may be subsequently closed with a cover 114. Cover 114 may be press fit into opening 112 and may include barbs (not shown) to assure the attachment thereto. A sealant may be provided at the opening 112/cover 114 interface to prevent leakage. Such sealant may be, for example, silicone. In this embodiment, contacts 24 are exactly symmetrical from top to bottom and end to end. This simplifies feeding of the material during processing and thereby lowers the cost of stamping the contacts.

In an alternative embodiment illustrated in FIGS. 4 and 5, a lamp base assembly 120 is illustrated. Lamp base assembly 120 comprises a base 122 having contacts 124 therein which are structured and arranged for mechanical and electrical connection to (a) lamp lead wires 126 of lamp 128 and (b) a connector 130, in a manner similar to the embodiment of FIGS. 1 to 3. Like contacts 24, contacts 124 are symmetrical top to bottom and end to end, and are brass.

The lamp base 122 comprises a base mounting portion 132 which is structured and arranged for attachment to an attachment member or nose in the form of a mounting element 134. The mounting element 134 may be a deep drawn metal can with a ring of plastic mounted onto it. Mounting element 134 comprises a cylindrical segment 136 attachable to the base mounting portion 132, and a radial surface 138 attachable to a lamp retainer 140. The base mounting portion 132 includes a recess 142 which comprises a cylindrical inner wall 144 which extends in direction 146 of base axis 148. It will be noted that the lamp retainer 140 is different from the lamp retainer 48 of FIGS. 1 to 3. Lamp retainers 48 and 140 are designed to accommodate a different type of lamp 32 and 128, respectively.

In the embodiment of FIGS. 4 and 5, the cylindrical segment 136 comprises an outer peripheral cylindrical surface 150. The radial surface 138 includes a flange 152 having a diameter greater than the diameter of the recess 142. In assembling the lamp base assembly 120, the cylindrical segment 136 is force fit into the recess 142 until the flange 152 engages the base mounting portion 132 as illustrated in FIG. 5. Essentially, the surface 150 will mate with the surface 144 (tubular interior wall). This allows for axial adjustment of the two pieces. With reference to FIGS. 4 and 5, the surface 154 of flange 152, the outer peripheral surface 156 (cylindrical wall) of the base mounting portion 132 and a flanged surface 158 (end face) of the base will form a groove 160 into which a seal (gasket or O-ring 162) may be inserted to provide a seal for use with the lamp base assembly 120 in a conventional manner. Since the outer peripheral wall 156 can be deep drawn, the wall 156 is then seamless. Similarly the flat flange 152 and flanged surface 158 can be seamless also, The resulting defined groove 160 then receives the seal 162 tightly without any interfering seams or flashings that frequently cause leaks in a small but now unacceptable number of lamp assemblies.

In the embodiment of FIGS. 4 and 5, the mounting element 134 is a single piece which is designed for attachment to the base 122 and the lamp retainer 140. In contrast, in the embodiment of FIGS. 1 to 3, each attachment member 40, 42 comprises two pieces including the cup-shaped element 44, 44' and the mounting element 46, 46', respectively. In a preferred embodiment, the mounting element 134 is a deep drawn metal can having a ring of plastic, such as Amoco Amodel 1145, partially molded onto it such that the top 164 of the can provides an exposed metal platform and the remainder of the flange provides a plastic ring. The top 164 forms a platform for 5-axis focusing and welding. During manufacture of the mounting element 134, the plastic flows through holes 166 from the outside of the metal can to the inside. This facilitates affixation of the plastic to the metal. The surface 154 of the plastic ring portion of the flange 152 forms the top of the groove 160 in the embodiment as illustrated in FIGS. 4 and 5.

In the embodiment of FIGS. 4 and 5, the base 122 is fabricated from low temperature plastic. The metal mounting element 134 shields the plastic base from sufficient heat to prevent outgassing or melting. Like groove 70 of the embodiment of FIGS. 1 to 3, the groove 160 is flash-free; the bottom and inside of the groove 160 are formed with a die draw thereby eliminating any parting lines in the O-ring groove. Being flash free, and not having parting lines means the o-ring is aligned well, departs an even locating force and is less likely to leak.

In the embodiment illustrated in FIGS. 4 and 5, the lamp retainer 140 includes a first segment 168 attachable to the mounting element 134 in a manner similar to that described herein regarding segment 88 of the embodiment illustrated in FIGS. 1 to 3. To this end, after focusing lamp 128 in an X-Y plane which is perpendicular to axis 146, wings 170 and 172 are welded to the metal platform 164 of the radial surface 138 at welds 174. Similarly, a second segment 176 is provided which is attachable to the first segment 168 after the lamp 128 has been focussed in the Z axis in a manner similar to that provided with respect to the embodiments of FIGS. 1 to 3. In the preferred embodiment the first segment 168 includes two pairs of spring arms 169 with one pair positioned on a long side of the first segment 168. The spring arms 169 are formed to press in an outward direction on the first segment. Each spring arm is formed with a slot (hole) formed in its root area extending up the center of the spring arm, sideways and downwards from the root area. The shape of the spring arms 169 reduce internal force on the first segment 168 (can), and also reduce heat conduction from the lamp and first segment 168 (can) to the radial surface 138 attached the lamp retainer 140 (metal nose and base). In the preferred embodiment the second segment 176 is formed as a downward facing can having a slot formed at the top to receive the lamp 128, and having inward facing spring tabs 177 to contact and retain the lamp 128. The exterior wall of the second segment 176 is then offset form the surface of the lamp 128 adjacent the press seal region. The four spring arms 169 fit inside the second segment 176 and press outwards on the interior side of the exterior wall of the second segment 176. The four spring arms 169 then hold the second segment 176 (can) which in turn holds the lamp 128. The spring arms 169 provide a constant spring force on to the inside of the second segment 176 (can) and maintain intimate contact for improved welding. The mating spring tension between the first segment and the second segment can then be made without regard to any cracking force placed directly on the press seal. The Z axis extends in direction 148. Attachment of the second segment 176 to the first segment 168 may be effected by welding the spring arms 169 together at weld points 178. The second segment 176 then standing off from the lamp's 128 press seal region, and the first segment having hollowed out spring arms, the heat conduction from the lamp 128 to the plastic base parts is then greatly reduced.

In the embodiment illustrated in FIGS. 1 to 5, the bases 22 and 122 are extruded, molded or otherwise fabricated as a one piece unit. In an alternative embodiment, the bases 22 and 122 may be modified to provide a first component and a separate second component attachable to the first component so that the base 22 or base 122 may be provided in the form of a straight base configuration or an angled configuration such as a 90 degree base configuration. Such structure also allows for providing a more expensive high temperature plastic base component nearest the lamp and a less expensive low temperature base component furthest from the lamp. For example, FIGS. 6 to 12 illustrate another embodiment of the present invention wherein the lamp base may be altered to provide a straight base configuration or an angled configuration such as a 90 degree base configuration.

With reference to FIG. 6, a lamp base assembly 200 is provided which includes a base comprising a high temperature plastic first base component 202 and a low temperature plastic second base component in the form of a straight base component 204, or a 90 degree base component 206, either of which is attachable to the first base component 202.

The first base component 202 comprises a first portion 208 structured and arranged for attachment to a lamp and a second portion 210 structured and arranged for attachment to the second base component 204 or 206, as desired. Each second base component 204 and 206 comprises a respective third portion 212 and 214 structured and arranged for attachment to the second portion 210. Each second base component 204 and 206 also comprises a respective fourth portion 216 and 218 comprising respective stainless steel contacts 220 and 222 structured and arranged for electrical and mechanical connection with (a) lead wires of a lamp and (b) a connector.

FIGS. 7 to 11 illustrate the lamp base assembly 200 in an embodiment where the base component 202 is attached to a straight base component 204. With reference to FIG. 8, the portion 210 of the base component 202 comprises a receptacle 224, and the portion 212 of the base component 204 provides an insert 212' which is configured to mate with such receptacle. The inner wall 226 of the receptacle 224 and the outer peripheral wall 228 of the insert 212' are substantially cylindrical and of equal diameter.

In the embodiment of the present invention illustrated in FIGS. 7 to 11, the portion 210 of the base component 202 may comprise at least one apertured protrusion through which the distal ends of lead wires of a lamp will protrude when the lamp is coupled to the lamp base. In such embodiment, the portion 212 of the base component 204 will comprise at least one corresponding aperture which is structured and arranged to mate with at least one apertured protrusion so that such apertured protrusion will extend into such corresponding aperture when the lamp base is assembled. For example, with reference to FIGS. 8, 10 and 11, there are three apertured protrusions 230 each of which is structured and arranged so that a respective lead wire end 232 of a lead wire 234 of the plurality of lead wires will extend therethrough when the lamp 236 is coupled to the lamp base assembly 200. Each apertured protrusion 230 mates with and extends into a respective aperture 238 of the portion 212 of the component 204. In the embodiment illustrated in FIGS. 8, 10 and 11, a contact end of at least one contact 220 is structured and arranged so as to be adjacent a respective lead wire end when the lamp has been coupled to the lamp base. For example, contact end 240 illustrated in FIGS. 8 and 10 is adjacent lead wire end 232.

In the embodiment illustrated in FIGS. 8 and 10, each apertured protrusion 230 is in the form of a truncated cone and comprises a beveled distal end 242, and each aperture 238 comprises a beveled peripheral edge 244. The beveled distal end 242 is adjacent the beveled peripheral edge 244 to form a V-shaped circular groove 246 adjacent the interface 248 of the apertured protrusion 230 and aperture 238. To perfect a seal at the interface of the base components 202 and 204 a UV sealant may be provided which runs around the groove 246 forming a complete sealing ring.

In the embodiment illustrated in FIGS. 8 and 10, the contact end 240 of the contact 220 comprises a funnel-shaped segment 250 having an apex 252 extending away from the aperture 238 when the base components 202 and 204 are attached to each other. In such embodiment, the lamp wire end 232 extends into and through the funnel-shaped segment 250. It will be noted that in the configuration illustrated in FIGS. 8 and 10, the lead wire end 232 extends beyond the apex 252 of the contact 220. One processing advantage of this design is that the length of such extended portion of the contact will not be critical since the lead wire 234 is laser welded to the contact 220 on the outer side of the funnel shaped segment 250 and is melted into the lead wire.

The portion 210 of base component 202 may comprise at least one heat stake pin, and the portion 212 of base component 204 may comprise at least one hole structured and arranged to mate with a respective heat stake pin. For example, with reference to FIGS. 9 and 11, the portion 210 includes two heat stake pins 254 and the portion 212 includes two holes 256 which mate with a respective heat stake pin. The pins 254 and the holes 256 are off center relative to a longitudinal axis 258 of the base components 202 and 204, such axis being coincident with the axis 260 of the lamp. In this manner, the pins act as rotational keys during assembly. Pins 254 serve to facilitate coupling the base component 202 to the base component 204 by ultrasonically welding the components together where the pins 254 and holes 256 engage one another. Pins 254 are designed to mate with (a) holes 256 in the straight base component 204 and (b) similar holes (not shown) in the right angle base component 206.

The lamp base illustrated in FIG. 12 is identical to the lamp base illustrated in FIGS. 7 to 11 with the exception that the second lamp component 206 and the contacts 222 are structured and arranged to provide a 90 degree base configuration. Therefore, the lamp base assembly and the lamp in each embodiment may be assembled using the same process and apparatus. In the embodiment of FIGS. 7 to 11, and with particular reference to FIG. 8, the portion 216 of base segment 204 extends in the direction 262 of a axis 258. The contacts 220 are L-shaped in this embodiment. With reference to FIG. 12, the portion 218 includes one segment 264 which extends in the direction 266 of a base axis 268 and a second segment 270 which extends in the direction 272 of an axis 274 which is at an angle 276 relative to axis 268. In the embodiment of FIG. 12, angle 276 is 90.degree.. In the embodiment illustrated in FIG. 12, the contacts 222 are S-shaped, each having legs 278 and 280 extending in direction 272 and joined by a leg 282 extending in direction 266 to provide a 90.degree. degree connector. Contacts 222 are molded into the base component 206.

Like the embodiments illustrated in FIGS. 1 to 5, the embodiments illustrated in FIGS. 6 to 12 provide a lamp base assembly comprising a base having a base mounting portion structured and arranged for attachment to any one of a plurality of differently configured lamp attachment members or noses. For example, FIG. 6 illustrates a base mounting portion 284 to which an attachment member in the form of a mounting element 286 may be attached. The mounting element 286 comprises a cylindrical segment 286' and radially projecting legs 288 which are structured and arranged to engage radially projecting legs 290 of the base mounting portion 284 of base component 202. The mounting element 286 is attached to the base component 202 by inserting the cylindrical insert 286' into a recess 292 of the portion 208 until the legs 288 engage legs 290. The cylindrical insert 286' may be press fit into the recess 292.

The base component 202 includes a flange 294 having a recess 296 therein into which a gasket or O-ring 298 may be inserted.

In the embodiment illustrated in FIG. 6, two different two piece lamp retainers for use with two different lamps are illustrated, each being attachable to the radial surfaces 288 of the mounting element 286. For example, lamp 236 may be coupled to the lamp base assembly using the lamp retainer 300. In particular, lamp retainer 300 comprises cylindrical segments 302 and 304. Segment 302 may be adjusted relative to the mounting element 286 for focusing lamp 236 in an X-Y plane which is perpendicular to axis 258, as described herein regarding the embodiment of FIGS. 1 to 5, by sliding the radially extending legs 306 of segment 302 upon legs 288 and then welding the pairs of legs together at 308 as illustrated in FIG. 8. The segments 302 and 304 may also be adjusted relative to each other for focusing lamp 236 in a Z direction which extends in the direction 262, as described herein regarding the embodiments of FIGS. 1 to 5, by axially sliding the segments relative to each other and then welding the segments together to provide welds 310 where the axially extending legs 312 of segment 302 engage an outer surface 314 of the segment 304 as illustrated in FIG. 8.

Lamp 316 may be coupled to the lamp base assembly 200 by the lamp retainer 318. In particular, lamp retainer 318 comprises cylindrical segments 320 and 322 which may be adjusted relative to each other for focusing purposes, as described herein regarding the embodiments of FIGS. 1 to 5. In particular, segment 320 may be adjusted relative to the mounting element 286 for focusing the lamp 316 in the X-Y plane as described herein regarding the embodiment of FIGS. 1 to 5, by sliding the radially extending legs 324 of segment 320 upon legs 288 and then welding the pairs of legs together at 326 as illustrated in FIG. 12. The segments 320 and 322 may also be adjusted in the Z direction by axially sliding the segments relative to each other and then welding the segments together to provide welds 328 where an inner surface 330 of segment 320 engages an outer surface 332 of the segment 322 as illustrated in FIG. 12.

The lamp base assembly of the present invention is typically combined with a reflector (not shown) to form a vehicle headlamp system. To this end, each of the lamp base assemblies of the present invention may include a spring which is useful in facilitating the accurate positioning of the lamp base assembly, and lamp attached thereto, relative to the reflector. Such a spring 400 is illustrated in FIGS. 6, 8 and 12. The use of such a spring 400 is described in U.S. Pat. No. 5,855,430 to Coushaine et al. This patent is commonly owned with the instant application, and is incorporated herein by reference.

The embodiments which have been described herein are but some of several which utilize this invention and are set forth here by way of illustration but not of limitation. It is apparent that many other embodiments which will be readily apparent to those skilled in the art may be made without departing materially from the spirit and scope of this invention.