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Primary Examiner: Smith, Alfred E.
Assistant Examiner: Moore, David K.
Attorney: Marshall; Dwight A.

Next ten patents ordered by date:

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Title: Photoelectric sensing system with light source compensating means

Abstract: A photoelectric sensing system for detecting the occurrence of interruptions of a light beam is arranged to compensate for non-interrupting short-term variations occurring during transmission of the light beam. A clock controlled memory element enables a light emitting generator to generate a serial train of light pulse signals. Each generated light pulse signal is sensed by a sensor arranged to control the memory element to modulate the emitted light pulse signal to compensate for short-term variations occurring in the light signal transmission path.

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Inventors: Kinder, George William (Columbus, OH, US)

Application Number: 641274
Filing Date: 1975-12-16
Publication_date: 1977-10-18
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 250/205 250/214AG, 250/552
Other Classes:
US Patent Ref:

3742222	Jun, 1973	Endl	250/209.
3819947	Jun, 1974	Johnson et al.	250/552.

Other Refs: Other References: Thomas, Jr. and Tyndall, Jr. "Digital Feedback Light-Emitting Diode Control" IBM Technical Disclosure Bulletin, vol. 16, No. 8, Jan. 1974.