Screen Holdings Co., Ltd.

Masaki Sasada

Masahiko Kokubo

Yoshio Furuya

Fujikazu Kitamura

A light irradiation apparatus () includes a light source unit () and an irradiation optical system (). In the light source unit, light source parts () arrayed in a plane emit laser light toward the irradiation optical system from different directions along the plane, and by the irradiation optical system, the laser light is guided along an optical axis (J) to an irradiation plane (). The irradiation optical system includes a division lens part (), an optical path length difference generation part (), and a condensing lens part (). The division lens part includes element lenses () that divide light incident from the light source parts. The optical path length difference generation part includes transparent parts () having different optical path lengths from each other, and light that has passed through the element lenses respectively enters the transparent parts. The condensing lens part superimposes irradiation regions () of the light from the transparent parts on each other on the irradiation plane. Accordingly, the irradiation plane can be irradiated with high-intensity light having a uniform intensity distribution.

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Kyoto, Japan

Masaki Sasada