Autofocus mechanism for laser imager

Details Autofocus mechanism for laser imager Autofocus mechanism for laser imager

1996-04-24

1998-06-09

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347257, 347258, B41J 247

Patent

active

057642729

ABSTRACT:
A laser imager autofocus apparatus, adapted to receive media with an image surface to be scanned, includes a laser and laser optics for producing a beam of light focused at an image plane. A photodiode is associated with the laser and adapted to produce a signal characteristic of the amount of light from the laser that is reflected from the image surface of received media onto the photodiode. Focus of the laser beam on the image surface is adjusted in response to the characteristic signal to maintain close association of the image surface of received media and the image plane of the laser and laser optics. The focus adjusting means may move one or more of the laser, the laser optics, or the image surface of received media. The laser source may be an array of plural laser sources in a line, and the plural laser sources may tilt relative to the image surface of received media.

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patent: 5159352 (1992-10-01), Ferla et al.
patent: 5270734 (1993-12-01), Ferschl

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