Camera
US4811039A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1986 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | May 30, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/08
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.