Weak lens focus adjusting mechanism based upon thickness of scan

Details Weak lens focus adjusting mechanism based upon thickness of scan Weak lens focus adjusting mechanism based upon thickness of scan

1995-01-17

1997-09-02

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502015, 25055927, 359210, H01J 120

Patent

active

056635540

ABSTRACT:
An adjustable focusing apparatus in a scanning device is used in imagesetters, scanners, and platemaking devices to focus a scanning beam on an element to be scanned. Precise focusing is achieved with the adjustable focusing apparatus to produce output images free of undesirable artifacts. The scanning device produces a beam from a light source to scan the element. An optical system focuses the beam on a particular surface within the element. The adjustable focusing apparatus adjusts the focus position of the scanning beam relative to the element according to the thickness of the element.

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