Focal plane shutter apparatus

Details Focal plane shutter apparatus Focal plane shutter apparatus

2007-05-01

2007-05-01

Vu, Ngoc-Yen (Department: 2622)

Television

Camera, system and detail

Optics

C396S487000, C348S374000

Reexamination Certificate

active

10280089

ABSTRACT:
A focal plane shutter apparatus is constructed by a light shielding blade, a fitting pin attached to the blade and an arm which is slidably engaged with the fitting pin to open or close the blade. A surface hardness of the fitting pin is higher than that of the arm. Concretely, the surface hardness of the arm is Hv300 to 600, and the surface hardness of the fitting pin is Hv450 to 1000. The arm and the fitting pin are subjected to chemical polishing treatment. Furthermore, the fitting pin is plated with nickel, chromium, palladium or rhodium. The fitting pin and arm have a substantially equal material hardness, or the material hardness of the fitting pin is higher. As the case may be, the fitting pin or arm may be plated with gold. Such an arrangement can suppress generation and accumulation of abrasion powder in the focal plane shutter apparatus assembled into a digital camera.

REFERENCES:
patent: 5664247 (1997-09-01), Hasuda et al.
patent: 6474880 (2002-11-01), Toyoda et al.
patent: 6805500 (2004-10-01), Miyazaki
patent: 2004/0042787 (2004-03-01), Miyazaki
patent: 2004/0213561 (2004-10-01), Ichinose et al.
patent: 11-064925 (1999-03-01), None
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patent: 2001-311997 (2001-11-01), None
patent: 2002-010137 (2002-01-01), None
patent: 2002-156685 (2002-05-01), None

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