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.

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.