Kyoto Semiconductor Co., Ltd.

Ken Usui

Etsuji Omura

Takatomo Isomura

In the optical power supply converters (A toC) having a semiconductor light receiving element () including a light receiving section () on a main surface () side of a semiconductor substrate (), the semiconductor substrate () has at least one inclined end surface () that intersects the main surface () at an acute angle, and the light incident on the inclined end surface () is refracted so as to be incident on the receiving section ().

Optical power supply converter

A semiconductor light receiving element comprises a light absorption region formed in the vicinity of the main surface of the semiconductor substrate transparent to the incident light; an incident region set to be concentric with and larger than the light absorption region; and a partially spherical concave reflecting portion formed on a back surface of the semiconductor substrate and capable of reflecting incident light incident on the incident region from the main surface side toward the light absorbing region; wherein, when the radius of curvature of the portion is R, the diameter of the incident region is B, the distance between the light absorbing region and the concave reflecting portion is W, and the diameter of the light absorbing region is P, then the radius of curvature R satisfies a condition of 2 BW/(B&#x2212;P/2)&#x2264;R&#x2264;2BW/(B&#x2212;P).

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Kyoto, Japan

Ken Usui