Driving device and light-amount adjusting device provided...

Details Driving device and light-amount adjusting device provided... Driving device and light-amount adjusting device provided...

2008-05-27

2008-05-27

Perkey, W. B. (Department: 2862)

Photography

Exposure control circuit

Diaphragm function only

C396S280000, C318S696000

Reexamination Certificate

active

10942641

ABSTRACT:
A driving device includes a stepping motor for causing the light-amount adjusting member to open and close so as to adjust an amount of light passing through an optical system. A driving range where the light-amount adjusting member is actually used for effecting light amount adjustment is set to a range exceeding an electrical angle 360° of the stepping motor. A mechanical abutment portion is provided at a position outside the driving range, and a portion of the light-amount adjusting member is brought into abutment with the mechanical abutment portion when an initial reset of the stepping motor is performed. The light-amount adjusting member is brought to a position a predetermined distance away from the mechanical abutment portion when a light-amount adjusting function of the light-amount adjusting member is stopped.

REFERENCES:
patent: 5572270 (1996-11-01), Yamamoto et al.
patent: S62-193530 (1987-08-01), None
patent: H07-308098 (1995-11-01), None

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