Focus adjustable image reading device for calculating a focus po

Details Focus adjustable image reading device for calculating a focus po Focus adjustable image reading device for calculating a focus po

1996-09-20

1998-04-21

Fuller, Benjamin R.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347262, B41J 247, B41J 2435, G01D 1534, G01D 1524

Patent

active

057423261

ABSTRACT:
An image reading device and method for producing a uniformly focused light image on a source document includes a document mount, an imaging device, and a drive assembly for moving at least one of the mounting device and the imaging device in a secondary scanning direction. The image reading device includes a control circuit for establishing multiple designated positions on the source document in the primary scanning direction and in the secondary scanning direction and for calculating the focus position from a signal output from the imaging device for the multiple designated positions. A cam member can be provided to adjust the position of the document mount along the optical axis of the light striking the document, a cam surface of the cam member contacting the document mount.

REFERENCES:
patent: 4131782 (1978-12-01), Einstein et al.
patent: 4732473 (1988-03-01), Bille et al.
patent: 5008684 (1991-04-01), Kurafuji
patent: 5146087 (1992-09-01), Van Dusen

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