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:
Apr. 06, 1999
Filed:
Dec. 02, 1997
Yuko Abe, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
An automatic focussing method and an automatic focussing device capable of performing correct focussing. The relative position between an object 4 and an objective lens 2 is measured for focussing. The laser light illuminated on the object is transmitted through a cylindrical lens 7 so as to be condensed only as to one direction. The laser light condensed as to the one direction is illuminated via the objective lens 2 on the object 4 in a linear form. The illuminated laser light reflected by the object 4 is integrated and detected by a detection unit. The relative position between the object and the objective lens is measured from the spot of the detected reflected laser light in order to perform focussing.