发明名称 |
Light irradiation device and image forming apparatus |
摘要 |
A light irradiation device includes: a light source to output diffused light; and a light guide member to guide the diffused light to an irradiation point. The light guide member includes an incidence surface which the diffused light enters, a first emission surface to emit the entered diffused light, while further diffusing the entered diffused light with a first diffusion characteristic to emit the diffused light at a first diffusion angle, and a second emission surface to emit the entered diffused light, while further diffusing the entered diffused light with a second diffusion characteristics to emit the diffused light at a second diffusion angle. The second diffusion angle provided by the second diffusion characteristic is smaller than the first diffusion angle provided by the first diffusion characteristic. |
申请公布号 |
US9057809(B2) |
申请公布日期 |
2015.06.16 |
申请号 |
US201414468382 |
申请日期 |
2014.08.26 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
Iwamatsu Akihiro;Fujimoto Tsuyoshi;Inoue Tokiko |
分类号 |
H04N1/04;F21V8/00;H04N1/028 |
主分类号 |
H04N1/04 |
代理机构 |
Harness, Dickey & Pierce, P.L.C. |
代理人 |
Harness, Dickey & Pierce, P.L.C. |
主权项 |
1. A light irradiation device comprising:
a light source to output diffused light; and a light guide member to guide the diffused light to an irradiation point, the light guide member including:
an incidence surface which the diffused light outputted from the light source enters;a first emission surface to emit an optical-axis center portion of the entered diffused light, while further diffusing the entered diffused light with a first diffusion characteristic to emit the diffused light at a first diffusion angle; anda second emission surface to emit a peripheral portion of the entered diffused light, the peripheral portion being around the optical-axis center portion, while further diffusing the entered diffused light with a second diffusion characteristics to emit the diffused light at a second diffusion angle, wherein the second diffusion angle provided by the second diffusion characteristic is smaller than the first diffusion angle provided by the first diffusion characteristic. |
地址 |
Tokyo JP |