Semiconductor light receiving apparatus

Details Semiconductor light receiving apparatus Semiconductor light receiving apparatus

1994-09-22

1996-08-27

Shafer, Ricky D.

Optical: systems and elements

Protection from moisture or foreign particle

Sealing

359894, 372 33, 372 36, 372 43, 257 98, 257 99, 257680, H01L 310232, H01L 3300, H01S 318, G02B 700

Patent

active

055506755

ABSTRACT:
It is the object of the invention to suppress noises caused by reflections of a ray of light from a light receiving surface of a photodiode chip and inner and outer surfaces of a glass in a semiconductor light receiving apparatus. A construction of a light receiving apparatus is that, a photodiode chip 4 is mounted on a carrier 2 fixed to a stem 1, and a chip 4 is sealed up by a cap 7, which is provided with an opening 7a covered with glass 8. A ray of light transmits through an opening 7a, and incidents on a light receiving surface of a chip 4. A light receiving surface of a chip 4 and an outer surface of a glass 8 are inclined to the optical axis, where directions of inclinations are different to each other. An angle of inclination of a chip 4 is selected such that reflected rays from a chip 4 does not incident on an opening 7a. Accordingly, there is no ray which returns to a light source (not shown), and generation of delayed incidences to a chip 4 can be prevented.

REFERENCES:
patent: 4351051 (1982-09-01), Van Alem et al.
patent: 4686678 (1987-08-01), Ohta et al.
patent: 4768070 (1988-08-01), Takizawa et al.
patent: 4803689 (1989-02-01), Shibanuma
patent: 5033052 (1991-07-01), Masuko et al.
patent: 5089861 (1992-02-01), Tanaka et al.

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