To provide an optical quantity controller that can prevent the amount of light at an opening from being lost by the opening and closing operation of a shutter blade when an optical quantity adjust member is opened and closed.
An arm member can be moved to a first, a second, a third, and a fourth positions in order by driving a stepping motor in one direction. When the arm member is at the first position, the shutter blade closes an opening and an optical quantity adjustment member approaches the opening. When the arm member is at the second position, the shutter blade opens the opening and the optical quantity adjustment blade approaches the opening. When the arm member is at the third position, the shutter blade opens the opening and the optical quantity adjustment blade retracts from the opening. When the arm member is at the fourth position, the shutter blade closes the opening and the optical quantity adjustment blade retracts from the opening.
JP2007212645A | 2007-08-23 | |||
JP2005354875A | 2005-12-22 | |||
JPS5910934A | 1984-01-20 | |||
JP2003274629A | 2003-09-26 | |||
JP2001117135A | 2001-04-27 | |||
JPH0954354A | 1997-02-25 | |||
JP2005077760A | 2005-03-24 |
Atsushi Mizumoto
Hirayama Tomoya
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