Ricoh Optical Industries Co., Ltd.

Mitsuhiro Kudou

Hiroaki Takahashi

Akira Takahashi

Katsuya Kusaka

Masaharu Odashima

Hiroyuki Anbe

Shigeru Umeki

Ichiroh Oikawa

An optical system includes a plurality of separate light sources with a number M of the light sources arranged in a first direction and a number N of the light sources arranged in a second direction. Each of the light sources has an asymmetric light emission area. The light sources are arranged so that a light beam passing a collimator optical element has a beam width in the first direction greater than a beam width in the second direction. An anamorphic optical element is arranged to have a beam-size reduction rate in the first direction greater than a beam-size reduction rate in the second direction and converts the plurality of light beams from the light sources into a light beam having a symmetric beam cross-section. A light-condensing optical element condenses the light beam having the symmetric beam cross-section into a light receiving element, and the anamorphic optical element includes an array of a number of prisms integrally arranged.

Power combination optical system and light source module

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Iwate, Japan

Mitsuhiro Kudou