Illumination device
First Claim
1. An illumination device for mixing and radiating the light emitted by a plurality of multi-color light emitting diodes, the illumination device comprising:
- a plurality of first lenses disposed in correspondence to each of said plurality of multi-color light emitting diodes in contact with or in the proximity of a front side thereof;
a second lens disposed on a front side of the plurality of first lenses, said second lens has a concave rear surface and a corrugated sheet-like unevenly profiled portion provided by a plurality of rows of recessed portions with concave shaped cross-sections on the concave rear surface,a hood covering the front side of said second lens, said hood has a shape with a front end portion extending obliquely and is arranged rotatably around an optical axis of said second lens;
a rear cylindrical portion having said plurality of multi-color light emitting diodes, the rear cylindrical portion being connected to said first lens with a front cylindrical portion having said second lens and said hood;
said front cylindrical portion includes a combining cylindrical portion detachably connected to said rear cylindrical portion, said hood extended over the periphery of the combining cylindrical portion, said second lens rotatably provided on the front end side in said combining cylindrical portion, and a rectangular shaped spring member provided on the rear side of the second lens in said combining cylindrical portion;
an inward edge portion extending inwardly to contact the second lens from the front side is provided at the front edge of said combining cylindrical portion; and
an annular groove continuing throughout the circumference of the hood is provided on an inner peripheral surface of said hood, whereinsaid rectangular shaped spring member defining ends of the rectangular shaped spring member and knobs provided at ends of the rectangular shaped spring member, the cut and knobs are configured to allow the rectangular shaped spring member to pass through said combining cylindrical portion such that outer peripheral portions of the rectangular shaped spring member fit in said annular groove, whereby said rectangular shaped spring member is latched with said combining cylindrical portion such that said rectangular shaped spring member elastically presses said second lens from the rear side while holding said hood rotatably and unmovably in the back-and-forth direction, andthe degree of diffusion of light incident from the rear surface side of the second lens, that is diffused and radiated from a front surface of the second lens, is larger in a direction orthogonal to a direction in which the plurality of rows of recessed portions extend, than in the direction in which the plurality of rows of recessed portions extend.
1 Assignment
0 Petitions
Accused Products
Abstract
Light having little color inconsistency is effectively emitted with a simple structure achieving favorable productivity. A plurality of multi-color light emitting diodes comprising a plurality of LED chips having different light emission colors is disposed on the same surface such that the light emitted by the plurality of the multi-color light emitting diodes is mixed and emitted in a illumination device, wherein at least one multi-color light emitting diode from among the plurality of multi-color light emitting diodes is disposed while being rotated by a prescribed angle with reference to one other multi-color light emitting diode in such a manner that when translating the one multi-color light emitting diode so as to overlap with the one other multi-color light emitting diode, LED chips having the same light emission color do not overlap with each other.
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Citations
5 Claims
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1. An illumination device for mixing and radiating the light emitted by a plurality of multi-color light emitting diodes, the illumination device comprising:
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a plurality of first lenses disposed in correspondence to each of said plurality of multi-color light emitting diodes in contact with or in the proximity of a front side thereof; a second lens disposed on a front side of the plurality of first lenses, said second lens has a concave rear surface and a corrugated sheet-like unevenly profiled portion provided by a plurality of rows of recessed portions with concave shaped cross-sections on the concave rear surface, a hood covering the front side of said second lens, said hood has a shape with a front end portion extending obliquely and is arranged rotatably around an optical axis of said second lens; a rear cylindrical portion having said plurality of multi-color light emitting diodes, the rear cylindrical portion being connected to said first lens with a front cylindrical portion having said second lens and said hood; said front cylindrical portion includes a combining cylindrical portion detachably connected to said rear cylindrical portion, said hood extended over the periphery of the combining cylindrical portion, said second lens rotatably provided on the front end side in said combining cylindrical portion, and a rectangular shaped spring member provided on the rear side of the second lens in said combining cylindrical portion; an inward edge portion extending inwardly to contact the second lens from the front side is provided at the front edge of said combining cylindrical portion; and an annular groove continuing throughout the circumference of the hood is provided on an inner peripheral surface of said hood, wherein said rectangular shaped spring member defining ends of the rectangular shaped spring member and knobs provided at ends of the rectangular shaped spring member, the cut and knobs are configured to allow the rectangular shaped spring member to pass through said combining cylindrical portion such that outer peripheral portions of the rectangular shaped spring member fit in said annular groove, whereby said rectangular shaped spring member is latched with said combining cylindrical portion such that said rectangular shaped spring member elastically presses said second lens from the rear side while holding said hood rotatably and unmovably in the back-and-forth direction, and the degree of diffusion of light incident from the rear surface side of the second lens, that is diffused and radiated from a front surface of the second lens, is larger in a direction orthogonal to a direction in which the plurality of rows of recessed portions extend, than in the direction in which the plurality of rows of recessed portions extend. - View Dependent Claims (2, 3, 4, 5)
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Specification