Method of controlling exposure of camera and diaphragm driving device for performing same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 23, 2001
Grant Date -
N/A
app pub date -
Jul 28, 1998
filing date -
Jul 29, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A diaphragm driving device for a camera with a single type sector includes a shutter base, a driver installed on the shutter base, and a diaphragm ring rotatably placed on the shutter base with the same center and connected to the driving source to receive rotational force from the driving source. The diaphragm ring has a cam side composed of a plurality of circular arc portions spaced apart from each other with a respective radius corresponding to an appropriate diaphragm value and rectilinear portions interconnecting the neighboring circular arc portions. A sector opening and closing device is rotatably fixed on the shutter base at its bottom portion. The head of the sector opening and closing device contacts the cam side of the diaphragm ring. The sector opening and closing device opens and closes the sector by rotating along the cam side. A desired aperture value is pre-determined by stopping rotation of the diaphragm ring when the sector opening and closing device is positioned on one of the circular arc portions corresponding to the aperture value. Thereafter, opening and closing speeds of the sector assembly is established.
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