Sumitomo Electric Industries, Limited

Hideaki Koseki

Yoshiki Kuhara

Ichiro Tonai

Hisato Michikoshi

A semiconductor light detecting device in which a housing with an optical fiber is inserted in is secured to a header with a photodiode chip mounted on integral therewith, and a light detecting surface of the photodiode chip is opposed to a light emitting surface of the optical fiber, the photodiode chip having a pn junction, the first region is surrounded by a second region of the second conductivity type formed at a portion of the semiconductor layer. The second region has the same or larger depth as or than that of the first region. Thus, even if a light is directed to the outside of the photo-sensing region, extra charges into the photo-sensing region is prevented. As a result, no optical lens system is necessary, and if an optical lens system is used, an inexpensive optical system may be used. Further, the device itself can be fabricated at low costs and easily.

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Osaka, Japan

Hideaki Koseki