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. 04, 2008
Filed:
May. 25, 2007
Method of manufacturing a molded article, manufacturing device and objective lens for optical pickup
Yasuhiro Yoneda, Iida, JP;
Teruo Yamashita, Akishima, JP;
Yasuhiro Yoneda, Iida, JP;
Teruo Yamashita, Akishima, JP;
Hoya Corporation, Tokyo, JP;
Abstract
A method of manufacturing an optical element, such as an objective lens, by heat-softening optical glass and press molding it with high precision in a pressing mold. The method comprises press-molding a molding material with a pressing device, comprising a pair of molds with prescribed shape, to make a molded article, measuring an optical property of the molded article, correcting pressing rate of at least one of the pressing molds based on the optical property thus measured, and further press-molding to make a molded article with the corrected pressing rate. The device has a means of driving one of the pair of pressing molds at a prescribed rate, a means for detecting an optical property, a shape or a number of the molded articles, and a means for controlling driving of the means of driving by correcting pressing rate of the molds based on the detected property, shape or number.