Camera shutter unit having a shutter blade to open and close an exposure aperture
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United States of America Patent
Stats
-
Jul 1, 2003
Grant Date -
Nov 15, 2001
app pub date -
May 15, 2001
filing date -
May 15, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The camera shutter unit of the present invention is provided with a diaphragm blade arranged to be capable of moving between a stopping-down position wherein an aperture is stopped down, and an evacuating position wherein the aperture is opened. A shutter blade is arranged to be capable of moving between an opening position, wherein the aperture is opened, and a closing position, wherein the aperture is closed. A drive-control mechanism is provided for drive-controlling the shutter blade and the diaphragm blade. The drive-control mechanism has a single electromagnetic drive source, and a spring for restricting movement of the shutter blade toward the closing position when the diaphragm blade is positioned in the stopping-down position, and for releasing its restriction by a predetermined or more drive force generated by the electromagnetic drive source. Therefore, the unit can be of a small size and low in cost, and its reliability of function can be improved.
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