Photography – Exposure control circuit – Program mode
Patent
1998-08-31
1999-12-21
Perkey, W. B.
Photography
Exposure control circuit
Program mode
G03B 7087
Patent
active
060060409
ABSTRACT:
A shatter device includes an exposure opening. Shutter blades slide in an opening direction to a maximum open position to open the exposure opening so as to provide an exposure. Then the shutter blades slide in a closing direction to close the exposure opening. An opening diameter is determined in accordance with the maximum open position, and is controlled smaller according to highness of subject brightness. A solenoid slides the shatter blades in the opening direction. A position detecting photo interrupter detects a reach of the shutter blades to a reference position while the solenoid slides the shutter blades in the opening direction. A controller obtains a timer time in accordance with the subject brightness, and starts measuring elapsed time in response to a signal from the photo interrupter. The solenoid is turned off when the measured elapsed time comes up to the timer time while the shutter-blades are slid further in the opening direction. Thereafter the shutter-blades are slid by inertia to the maximum open position, and then slid in the closing direction. Tho reference position is so predetermined that the maximum open position is changeable in a range limited by one limit open position located in the closing direction. The shutter blades, when located in the limit open position, open the exposure opening to a small extent. Thus opening operation of the shutter blades for the exposure opening is ensured even when the timer time is small.
REFERENCES:
patent: 5287140 (1994-02-01), Kohno
patent: 5794085 (1998-08-01), Nomura et al.
Aosaki Ko
Nishinou Naoyuki
Takeshita Yukitaka
Fuji Photo Film Co. , Ltd.
Perkey W. B.
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