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Linear illumination device
| Details |
Inventors: Nakamura, Tetsuroh; Hongou, Kouki; Tanaka, Eiichiro; Fujiwara, Shinji; Murata, Takahiko; Kajita, Yuka;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Lee; John R.
Assistant Examiner:
Attorney, Agent or Firm: Ratner & Prestia
A linear illumination device of the present invention includes: a guide made of a light transmitting material extending in a first direction, having a side face and at least one end face; at least one light emitter for allowing light to enter interior of the guide from the at least one end face of the guide; and a light diffusing section formed on part of the side face of the guide, for diffusing the light incident thereon, wherein at least part of the light entering the interior of the guide goes out from part of the side face of the guide facing the light diffusing section, thereby providing substantially linear illumination light along the first direction. |
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DETAILED DESCRIPTION The linear illumination device of this invention, includes: a guide made of a light transmitting material extending in a first direction, having a side face and at least one end face; light emitting means for allowing light to enter interior of the guide from the at least one end face of the guide; and a light diffusing section formed on part of the side face of the guide, for diffusing the light incident thereon, wherein at least part of the light entering the interior of the guide goes out from part of the side face of the guide facing the light diffusing section, thereby providing substantially linear illumination light along the first direction.
In one embodiment of the present invention, the light transmitting material has a light transmittance of 80% or more (according to ASTM measuring method D1003).
In another embodiment of the present invention, a refractive index of the light transmitting material is substantially in the range of 1.
4 to 1.
7.
In still another embodiment of the present invention, the light transmitting material is acrylic.
In still another embodiment of the present invention, the light transmitting material is polycarbonate.
In still another embodiment of the present invention, the guide has two end faces opposing each other, and the light emitting means includes two light emitters for allowing the light to enter the guide from the two end faces.
In still another embodiment of the present invention, the guide has two end faces opposing each other, and the light emitting means allows the light to enter the guide from one of the two end faces, the other end face being a mirror face or a reflective face.
In still another embodiment of the present invention, the light diffusing section includes a groove formed on part of the side face of the guide and a light diffusing layer provided on the groove.
In still another embodiment of the present invention, the light diffusing section has a rough surface.
In still another embodiment of the present invention, the light diffusing section has center line average roughness Ra is in the range of (100 to 0
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