Camera encoder assembly, system and method thereof

Details Camera encoder assembly, system and method thereof Camera encoder assembly, system and method thereof

1996-12-03

1997-12-23

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Dual purpose motor

396133, 396235, 396463, 396490, 25023116, 250237G, G03B 908, G03B 1334, G01D 536

Patent

active

057015252

ABSTRACT:
A camera shutter and focus encoder assembly comprises an encoder mask fixed in a camera housing and having an arcuate window having alternating opaque and transmissive portions, and an encoder sheet mounted in the housing in abutting relationship with the encoder mask, the encoder sheet being movable with exposure blades and the focus lens of the camera and having an arcuate window having alternating opaque and transmissive portions therein. Means are provided for pressing the encoder mask and the encoder sheet together with the mask and sheet windows in registration with each other. A sensor passes pulses of light through the mask and sheet windows when the transmissive portions thereof are in registration and detects the pulses of light, converts the light pulses to electrical signals, and transmits the electrical signals. A controller receives the electrical signals and determines therefrom the position and direction of movement of the shutter blades, compares the blade position and movement direction with a preselected program and sends to a motor a signal instructing any required compensating shutter blade movement change, and in like manner monitors the focus assembly and sends to the motor a signal instructing any required compensating lens movement change.

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