Improved control circuit for a shutter mechanism

Details Improved control circuit for a shutter mechanism Improved control circuit for a shutter mechanism

G - Physics

05

D

88/114, 341/97

G05D 27/02 (2006.01) G03B 9/10 (2006.01) G03B 9/58 (2006.01) G03B 27/00 (2006.01) G03F 7/20 (2006.01)

Patent

CA 1151751

ABSTRACT A shutter is rotatably mounted within a housing for opening and closing a shutter aperture formed in the housing. The shutter is coupled to a drive unit for unidirectionally rotating the shutter with the same velocity profile to open and close the shutter aperture during each exposure period. This drive unit includes a drive motor and a control circuit having a source of position and velocity reference data and a feedback control loop configurable for either position or velocity control of the shutter as determined by a control command.

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