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:
Mar. 07, 1989
Filed:
May. 30, 1986
Hiroshi Maeno, Tokyo, JP;
Hideo Tamamura, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a camera having the body thereof molded with optical members inserted in a synthetic resin material, the parts of the resin material covering the periphery of each of the optical members on the inner and outer sides thereof are arranged to have a thickness ratio varying between about 1:0.5 and about 1:2. Each of chamfers 'c' which are provided on the optical member in the direction of thickness 't' thereof is arranged to be about 0.1 (mm).ltoreq.c.ltoreq. about 0.2 t. Further, each intersecting angular part between two adjacent sides of the optical member is chamfered with the chamfer measuring about 0.1 l to 0.45 l or thereabout relative to the length l of the shorter of the two sides. The bevelling arrangement prevents the optical members from cracking due to uneven stress developing during the forming and contracting processes of insert molding.