Light receiver apparatus for mobile body

Details Light receiver apparatus for mobile body Light receiver apparatus for mobile body

2007-05-01

2007-05-01

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S2140RC

Reexamination Certificate

active

11093163

ABSTRACT:
A light receiver apparatus for a vehicle comprises a photo diode for receiving an incident light form a surrounding environment, a FET connected in series with the photo diode and a filter for extracting an a.c. signal from a received light signal developed at a junction with the photo diode when a reverse-bias voltage is applied to the photo diode. The a.c. signal is produced by removing from the received light signal a signal corresponding to a background light in the incident light. The FET varies a resistance thereof in accordance with the received light signal so that a d.c. signal in the received light signal is regulated to a fixed level irrespective of the intensity of the background light in the received light.

REFERENCES:
patent: 5057694 (1991-10-01), Idaka
patent: 5864391 (1999-01-01), Hosokawa
patent: 2003/0089841 (2003-05-01), Zheng-Yi
patent: 7-191145 (1995-07-01), None
patent: 10-197635 (1998-07-01), None
patent: 11-23250 (1999-01-01), None
patent: 11-160432 (1999-06-01), None
patent: 2002-22827 (2002-01-01), None

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