Lens-shutter device

Details Lens-shutter device Lens-shutter device

1998-10-09

2000-08-08

Gray, David M.

Photography

Camera detail

Diaphragm shutter unit

396462, 396497, G03B 1724

Patent

active

060991712

ABSTRACT:
A lens-shutter device of the present invention includes main blades and sub blades which can rotate in the opening and closing directions within an inner space formed by a case and a case cover. When the shutter is closed, protrusions of the case cover disposed on a rotating path of the main blades and protrusions of the case disposed on the same path permit each blade to be maintained in a state where gaps are more even and much smaller. This enables a satisfactory shield condition to be obtained. Furthermore, in a traveling range from the closed state to the open state of the shutter, drive load of the main blades is reduced by being released from the protrusions to enable smooth opening and closing, which results in effective shielding and a lighter drive load.

REFERENCES:
patent: 5381200 (1995-01-01), Takagai

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