Lamp assembly

[0001] 1. Technical Field

[0002] The present invention relates to lamp assemblies, and particularly to a lamp assembly with LED light sources.

[0003] 2. Discussion of Related Art

[0004] In recent years, light emitting diodes (LEDs) have been widely used in consumer and commercial applications, due to their low cost, long life, durability, and low power consumption. Fluorescent lamps have been gradually replaced by LED lamp assemblies.

[0005] However, the replacement rate is not as fast as expected. Because LED light assemblies are different with the fluorescent lamps in the structure, and more importantly, the cost of a LED lamp is higher than a fluorescent lamp. In addition, the LED lamp assemblies usually use a plurality of LEDs to reach the coordinative brightness comparing with the fluorescent lamps. For example, the LED lamp assembly to replace a 20 W fluorescent lamp will need at least sixteen LEDs in an array. Therefore, the cost of the LED lamp assembly may be expensive which may affect the replacement rate of the LED lamp assemblies.

[0006] Therefore, what is needed is a lamp assembly with LED light sources capable of overcoming the described limitations.

[0013] Reference will now be made to the drawings to describe in detail of the exemplary embodiments of the lamp assembly.

[0014] Referring to FIGS. 1 to 3, a lamp assembly 100, in accordance with an exemplary embodiment, includes a light guide member 11, a light reflective member 12 arranged opposite to the light guide member 11, and a light source 30 arranged adjacent to the light guide member 11.

[0015] The light guide member 11 includes a light incident surface 111, a light-emitting surface 112 adjacent to the light incident surface 111 and a concave surface 113 opposite to the light-emitting surface 112. The light guide member 11 is configured for guiding the light beams emitted from the light source 30 and converting the light source into surface light source, then exiting from the light-emitting surface 112. The light guide member 11 is a semi-cylinder. The concave surface 113 defines a groove 115 at the center of the light guide member 11. The groove 115 extends along a lengthwise direction of the light guide member 11. The shape of the cross-section of the groove 115 is semicircular. The light guide member 11 may be made of polymethyl methacrylate (PMMA), polycarbonate (PC) or glass, etc. The light sources 30 is arranged opposite to the light incident surface 111 of the light guide member 11. In the present embodiment, the light guide member 11 includes two light incident surfaces 111 arranged on two ends of the light guide member 11. The light sources 30 includes six light emitting diodes averagely divided into two groups and are respectively arranged opposite to two ends of the light guide member 11. A plurality of light scattering structures 114 is evenly arranged on the inner surface of the groove 115 to improve the uniformity of the surface light beams of the light guide member 11. The light scattering structures 114 may be a plurality of parallel V-shaped grooves extending along a lengthwise direction of the light guide member 11 (see FIG. 3) or a plurality of scattering dots (see FIG. 4)distributing on the concave surface 113.

[0016] The light reflective member 12 includes a semi-cylindrical main body 120, a reflective surface 121 opposite to the bottom surface 113 of the light guide member 11 and a protrusion 122 arranged on the center of the main body 120 protruding from the main body 120. The protrusion 122 extends in a lengthwise direction of the light reflective member 12 and is engaged in the groove 115 in the concave surface 113. The protrusion 122 is a semi-cylinder. The shape of the protrusion 122 is cooperated with the groove 115. Thus, the light guide member 11 is combined with the light reflective member 12 forming a cylinder. Furthermore, the reflective surface 121 of the light reflective member 12 is covered by a reflective film (not shown) to let the light beams from the bottom surface 113 of the light guide member 11 reflect to the light guide member 11, then emit from the light-emitting surface 112. Thus, the lightness of the lamp assembly 100 can be improved.

[0017] The light source 30 further includes two circuit boards 20 and two contact pins 21. The two circuit boards 20 are separately arranged on two ends of the light reflective member 12. Each circuit board 20 has three light emitting diodes electrically mounted on the inner side surface of the circuit board 20 and facing toward the light incident surface 111 of the light guide member 11. The three light emitting diodes are arranged in triangle distribution on the circuit board 20.

[0018] The contact pins 21 are electrically connected to the circuit boards 20 and extending in a direction away from the light incident surface 111 for electrically connection to a power source. Thus, the lamp assembly 100 is capable of directly replacing a fluorescent lamp in nowadays.

[0019] It should be understood that the total number of the circuit board 20 can be only one and is arranged on one end of the light reflective member 12. The light emitting diodes can be arranged only on one circuit board 20 facing toward the light incident surface 111 of the light guide member 11. The number of the light emitting diodes can be only one or more than one.

[0020] It should be understood that the shape of the light guide member 11 and the shape the light reflective member 12 are not limited as the present embodiment. For example, the light guide member 11 and the light reflective member 12 can be a semi truncated cone, a cuboid, a triangular prism or other shapes. What is required is that the reflective surface 121 of the light reflective member 12 and the bottom surface 113 of the light guide member 11 are opposite to each other, and light beams emitted from the bottom surface 113 can be reflected by the reflective surface 121.

[0021] The lamp assembly 100 of the present embodiment only use a few light emitting diodes to achieve the same brightness of the current lamp assembly that using LED as light sources. Therefore, the cost of the production can be reduced. Moreover, the specification of the lamp assembly 100 is as same as the specification of the present fluorescent lamp, such as size, shape and the plugs, so the lamp assembly 100 is capable of replacing the fluorescent lamp directly.

[0022] While the present invention has been described as having preferred or exemplary embodiments, the embodiments can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the embodiments using the general principles of the invention as claimed. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains and which fall within the limits of the appended claims or equivalents thereof.