Optical scanner

Details Optical scanner Optical scanner

1978-10-10

1980-08-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250235, G01J 120

Patent

active

042163781

ABSTRACT:
An optical scanner for scanning an image on a document to produce an electrical signal representing the image density of the image at successively scanned points positioned along a scan line on the document includes a platen for supporting the document in a scan plane. A rotatable mirror in the scanner optical system is rotated at a non-uniform angular velocity to scan the document at a controlled scan rate which may be selected as a uniform scan rate. Rotation of the mirror is controlled by means of a servo control loop responsive to a reference signal and to the output of a reference transducer which receives light from a reference grating as the mirror is rotated.

REFERENCES:
patent: 3389403 (1968-06-01), Cottingham et al.
patent: 3814494 (1974-06-01), Shiragai et al.
patent: 3997828 (1976-12-01), Bottcher et al.
patent: 4037231 (1977-07-01), Broyles et al.
patent: 4041454 (1977-08-01), Shephard et al.
patent: 4060907 (1977-12-01), Van Hook

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