Shielding blades for TTL multi-pattern light adjustment preventi

Details Shielding blades for TTL multi-pattern light adjustment preventi Shielding blades for TTL multi-pattern light adjustment preventi

1995-02-22

1995-12-05

Perkey, W. B.

354480, 354246, G03B 940

Patent

active

054734053

ABSTRACT:
According to one aspect of the present invention, a focal plane shutter of a camera for conducting TTL multi-pattern light adjustment is provided that comprises a plurality of shielding blades for covering an aperture in a developed position. Each of the shielding blades has at least one edge thereof overlapped by one of the shielding blades immediately adjacent thereto in the developed position, the overlapped edge having a predetermined minimum overlap width. Each of the shielding blades has the lens-side surface thereof formed to be light-reflective having a rate of diffused reflection. The rate of diffused reflection is set within a range according to the predetermined minimum overlap width, such that TTL multi-pattern exposure is enabled and light leakage between the shielding blades does not occur.

REFERENCES:
patent: 4065777 (1977-12-01), Maitani et al.
patent: 4459007 (1984-07-01), Nemoto et al.
patent: 4797699 (1989-01-01), Nemoto et al.
patent: 4926202 (1990-05-01), Fukuda et al.
patent: 5231448 (1993-07-01), Sato et al.

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