Optical chopper with high rate of focus dither

Details Optical chopper with high rate of focus dither Optical chopper with high rate of focus dither

1984-07-13

1987-02-03

Corbin, John K.

350272, G02B 2602

Patent

active

046405801

ABSTRACT:
In an optical system with an optical axis in which an image is to be focused at an image plane, an improved chopper which can be driven at a high rate for obtaining dither about the focal point in the system includes first and second chopper blades, each having at least one notch in their periphery, the chopper blades mounted to a common shaft adapted for rotation, parallel to each other and essentially perpendicular to the optical axis and on opposite side of the image plane, the outputs of one of the blades will representing an ahead of focus edge response and the other of said blades a behind focus edge response which can be sensed and processed to carry out correction of the optical system.

REFERENCES:
patent: 3435213 (1969-03-01), Colbow et al.

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