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:
Nov. 03, 1981
Filed:
Aug. 23, 1979
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A distance measuring device is disclosed which includes a light emitting diode for projecting a light beam and photoresponsive elements for receiving the reflected light beam from an object. The photoresponsive elements are coupled to a circuit for producing a signal indicative of the distance between the device and the object. A circuit is provided for generating a timing signal in relation to the phase of the alternative fluctuations in the intensity of the ambient light. The light emitting diode is so controlled as to be allowed to project light beam when the timing signal is produced. The timing signal is arranged to occur during periods of zero or minimal ambient light fluctuations so that the distance measuring device is immune to the ambient light fluctuations.