Synchronizing signal generating circuit for optical scanning dev

Details Synchronizing signal generating circuit for optical scanning dev Synchronizing signal generating circuit for optical scanning dev

1996-09-27

1998-08-11

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358481, H01J 314

Patent

active

057930368

ABSTRACT:
A synchronizing signal generating circuit for an optical scanning device. The synchronizing signal gernerating circuit including a photodiode, a high-pass filter circuit, and a signal processing circuit. The high-pass filter circuit is the load for the photodiode and is comprised of an inductance and a resistance arranged in parallel. The high-pass filter circuit is configured to have a cutoff frequency that is marginally below the frequency of a synchronizing signal. The signal processing circuit is connected to the connection point of the photodiode and the high-pass filter circuit and receives a detection signal. The signal processing circuit amplifies the detection signal, cuts the DC component, and compares the resulting signal to a reference voltage to produce the synchronizing signal.

REFERENCES:
patent: 4663523 (1987-05-01), Swanberg
patent: 5001341 (1991-03-01), Negishi
patent: 5084616 (1992-01-01), Morimoto
patent: 5087813 (1992-02-01), Negishi
patent: 5138479 (1992-08-01), Ando

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