Plate member for use as material of light shielding blades

Details Plate member for use as material of light shielding blades Plate member for use as material of light shielding blades

1992-06-23

1993-04-13

Gellner, Michael L.

G03B 940

Patent

active

052027155

ABSTRACT:
A laminated plate member having a thickness of 60 to 120 .mu.m and used as a material of focal plane shutter blades or iris blades of a camera has an intermediate layer made from a material composed of uni-directionally oriented continuous (long) or short carbon fibers and a matrix resin enveloping the carbon fibers, the material having a resin content ranging from 50 to 60 wt % when the carbon fibers are long fibers and 60 to 75 wt % when the fibers are short fibers, and surface layers on both sides of the intermediate layer, each surface layer being made from a material composed of a matrix resin enveloping long carbon fibers uni-directionally oriented in a direction substantially orthogonal to that of the carbon fibers in the intermediate layer, the material of the surface layers having a resin content ranging from 30 to 45 wt %.

REFERENCES:
patent: 4482231 (1984-11-01), Kato et al.
patent: 5025278 (1991-06-01), Matsubara

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