Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-08-09
2005-08-09
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S2140LS, C398S158000, C398S172000, C340S556000
Reexamination Certificate
active
06927385
ABSTRACT:
An optical sensor includes a light transmitter for transmitting pulsed light signals and a light receiver for receiving them. In order to suppress the effects of interfering noise light, the light signals are transmitted according to a specified pattern including pulses in packages separated from each other by a specified interval, the pulses within each of the packages following one another with a specified carrier frequency. Groups each including two or more such pulse packages may be employed. The light receiver converts a received light signal into an electrical signal and directly thereafter passes the electrical signal through a bandpass filter with a pass band including this carrier frequency. The light receiver may normalize received electrical pulses by suppressing those which are too low or narrow and uniformizing the width of those not suppressed, expand the pulses with the uniformized widths to improve accuracy of evaluation, integrate the expanded pulses and examine whether the integrated signal exceeds a specified threshold value.
REFERENCES:
patent: 3097340 (1963-07-01), Dobbie
patent: 3676699 (1972-07-01), Warren
patent: 3866177 (1975-02-01), Kawamata et al.
patent: 4095125 (1978-06-01), Ingle
patent: 4724312 (1988-02-01), Snaper
patent: 5103085 (1992-04-01), Zimmerman
patent: 5532472 (1996-07-01), Furuta
patent: 5574585 (1996-11-01), Thaler et al.
patent: 5801376 (1998-09-01), Haberl et al.
patent: 5901376 (1999-05-01), Deirmendjian et al.
patent: 5933040 (1999-08-01), Rokhsaz et al.
patent: 6169765 (2001-01-01), Holcombe
patent: 6396060 (2002-05-01), Ramsey
patent: 3125728 (1982-02-01), None
patent: 3435097 (1985-04-01), None
patent: 3823007 (1990-01-01), None
patent: 4015912 (1991-01-01), None
patent: 19613940 (1997-10-01), None
patent: 19848949 (1999-05-01), None
patent: 19924351 (1999-12-01), None
Adamietz Hubert
Betz Jochen
Ojemann Folke
Sakai Yasunobu
Schurer Martin
Beyer Weaver & Thomas LLP
Luu Thanh X.
Omron Corporation
Yam Stephen
LandOfFree
Optical sensor and method of suppressing interference light... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical sensor and method of suppressing interference light..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical sensor and method of suppressing interference light... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3481838