Patent Application
20090002984
This application claims the priority benefit of Taiwan application serial no. 96123520, filed on Jun. 28, 2007. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification.
1. Field of the Invention
The invention relates to an illumination device and, more particularly, to an illumination device with an optical element fixing structure.
2. Description of the Related Art
The light emitting diode (LED) mainly is a light emitting element composed of III-V or II-IV compound semiconductor material. The light emitting principle of the LED is different from that of the conventional tungsten bulb. The tungsten bulb consumes power easily, generates a great deal of heat, lacks the feature of anti-collision and has a short lifespan. The LED has a small size, long lifespan, low driving voltage, rapid response speed and the feature of good anti-shake. Therefore, the LED is widely used in the field of electronic product such as the illumination device, traffic sign, outdoor display panel and the automobile light source.
In the household illumination device, the conventional table lamp, desk lamp or floor lamp mainly utilizes the electricity-saving lighting tube which has a long lifespan and consumes a little power as the light source. However, in the recently years, the LED technology develops rapidly, and the LED becomes a new generation illumination light source. Therefore, different LED lamp becomes commercialized. Some manufacturers emphasize that the table lamp has the feature of anti-glare and protecting eyes thus to attract the consumer. The table lamp with the feature of anti-glare and protecting eyes utilizes filters disposed under the lampshade. The reflect light and the glare that hurt eyes and interfere with the eyesight are filtered via the polarization principle. However, the brightness relatively decreases.
In addition, to gather the spot light source emitted by each LED in the table lamp to be an area light source and allow the light to illuminate evenly, the lampshade and reflector are often used to collect the useful illumination light. Conventionally, the lens assembly adheres to the lampshade by material such as glue to provide an ideal area light source to illuminate the desktop evenly.
The invention provides an illumination device which utilizes lenses to allow each LED to emit light evenly to provide ideal area light source.
The invention provides an optical element fixing structure, and the lenses in the optical element fixing structure are fixed on the supporter without glue, which saves time and decreases the defect rate.
The invention provides an illumination device including a plurality of LEDs, a plurality of lenses and a supporter. The LEDs are used to provide illuminative light. The lenses are provided at the optical paths of the LEDs. Each of the lenses has a body and a guiding part. The body has a light inlet surface and a light outlet surface at the opposite side. In addition, the supporter has a plurality of holding rooms for accommodating the lenses. each of the holding rooms has an embedded portion. Each of the guiding parts is guided to each of the embedded portions to allow the body of each of lenses to be held in the holding room.
The invention further provides an optical element fixing structure adapted to an illumination device having a plurality of LEDs. The optical element fixing structure includes a plurality of lenses and a supporter. The lenses are provided on the optical paths of the LEDs. Each of the lenses has a body and a guiding part, respectively. The body has a light inlet surface and a light outlet surface at the opposite side. The supporter has a plurality of holding rooms for accommodating the lenses. The holding room has an embedded portion. Each of the guiding parts is guided to each of the embedded portions.
In one embodiment of the invention, the guiding part includes a plate portion extending outside the body.
In one embodiment of the invention, the light inlet surface of each of the lenses is a concave structure. In addition, the light inlet surface may have an optical grain.
In one embodiment of the invention, the bottom of the holding room has an opening, and the light outlet surface of each of the bodies of the lenses is exposed from the opening correspondingly.
In one embodiment of the invention, the lenses and the LEDs are provided one to one or one to many.
In the illumination device having an optical element fixing structure of the invention, a plurality of lenses are provided on the optical paths of a plurality of LEDs via the supporter, and then light emitted by the LEDs is refracted via the lenses to obtain the ideal area light source which emits light evenly. In addition, the lenses are fixed on the supporter by the fastening of the holding rooms and the bodies of lenses instead of the glue. Therefore, the assembly is easy, the rework rate is low and the defect rate decreases.
These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings.
As shown in
In the embodiment, the illumination device 100 has an optical element fixing structure composed of at least a lens 130 and a supporter 140 and disposed in the shade 120 to increase the brightness of illumination and to allow the LEDs to emit light evenly to provide an ideal area light source. The lenses 130 are provided on the optical paths of the LEDs 110. After the light emits in through the light inlet surface 132 of the lens 130, it emits out the light outlet surface 134 at the opposite side and illuminates evenly.
The lens 130 is an optical lens having the function of controlling the light emitting angle and adjusting the light shape. The supporter 140 is made of a common transparent material such as transparent acryl, glass or other transparent material. Furthermore, the system temperature increases when the LED emits light. If the lenses 130 are fixed at the supporter 140 via the glue, the lifespan of the glue decreases under the high temperature. With the increase of the defect rate of the glue, the rework rate becomes high. Therefore, in the invention, the lenses 130 are assembled via the fixing mechanism of the supporter 140 instead of the glue to save the working time and decrease the defect rate.
In
As shown in
In the embodiment, although the lenses 130 and the LEDs 110 shown in
In the embodiment, the body 131 of the lens 130 is preferred to be integrally formed with the guiding part 136 by injection molding, and the holding room 142 and the embedded portion 146 of the supporter 140 are preferred to be formed via the molding. In other embodiment, the body 131 of the lens 130 also may be fixed on the supporter 140 via the fastening structure, locking structure or structure with the feature of easy and fast assembly and easy rework to decrease the defect rate of the assembly.
To sum up, the illumination device of embodiment of the invention has an optical element fixing structure, and a plurality of lenses are provided on the optical paths of a plurality of LEDs via a supporter, and then the LEDs utilize the lenses to refract the light to obtain an ideal area light source which emits the light evenly. In addition, the lenses are fixed on the supporter via the fastening of the holding rooms and the bodies of the lenses instead of the glue. Therefore, the assembly is easy, the rework rate is low and the defect rate decreases.
Although the present invention has been described in considerable detail with reference to certain preferred embodiments thereof, the disclosure is not for limiting the scope of the invention. Persons having ordinary skill in the art may make various modifications and changes without departing from the scope and spirit of the invention. Therefore, the scope of the appended claims should not be limited to the description of the preferred embodiments described above.
| Number | Date | Country | Kind |
|---|---|---|---|
| 96123520 | Jun 2007 | TW | national |
