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:
Feb. 09, 1993
Filed:
Feb. 05, 1992
Masanori Inamori, Tenri, JP;
Toshihide Miyake, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
For use with an automatic focusing device, a semiconductor integrated circuit is provided for measuring distance having a light-detecting element for receiving light from an object, the distance to the subject is to be measured, and outputting a signal according to the distance from the object. The semiconductor integrated circuit is formed in one chip and includes a distance measurement arithmetic unit for forming digital distance measurement data inversely proportional to the distance to the object from the signal from the light-detecting element; a memory unit for writing therein two items of distance measurement data output from the distance measurement arithmetic unit with regard to two known distances in a calibration mode, and a data arithmeteic unit for computing an automatic focusing device control signal from the two items of distances measurement data stored in the memory unit and distance measurement data output from the distance measurement arithmetic unit in a distance measuring mode.