The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 1986
Filed:
Nov. 17, 1980
Applicant:
Inventor:
Stephen K Shu, Fountain Valley, CA (US);
Assignee:
Del Mar Avionics, Irvine, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
250221 ; 2502 / ;
Abstract
An opto-electronic end-of-tape sensor has a pulsed light source for producing high intensity, short duration light pulses and a photodetector controlling a clock driven digital counter. In a normal condition with tape blocking the light pulses, the counter is kept in a reset state. If a clear light path of sufficient time duration is detected the photodetector output enables the counter to reach a predetermined count to obtain an end-of-tape signal output. The sensor circuit discriminates against pinholes in the tape by requiring detection of an uninterrupted predetermined number of light pulses to generate the end-of-tape signal.