Camera

Details Camera Camera

1986-05-30

1989-03-07

Perkey, W. B.

354288, G03B 1708

Patent

active

048110396

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.

REFERENCES:
patent: 3065666 (1962-11-01), Sampson
patent: 3206017 (1965-09-01), Williams
patent: 3906535 (1975-09-01), Takahama et al.

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