Auto-focus detector mask

Details Auto-focus detector mask Auto-focus detector mask

1991-08-23

1993-12-14

Fuller, Benjamin R.

Recorders

Thermal recording

346108, G01D 1510

Patent

active

052707342

ABSTRACT:
An imaging system comprising a source of light movable with respect to a writing element and projectable thereon to generate an image, a focusing device is provided for focusing a light source which generates a first beam of light of a wavelength selected to be actinic with respect to the writing element. The focusing device includes a focusing light detector which is mounted adjacent the light source and is provided with a micromask to protect it from unwanted light to improve the sensitivity of the detector and the focusing device.

REFERENCES:
patent: 4982206 (1991-01-01), Kessler et al.
patent: 5053791 (1991-10-01), Baek et al.
patent: 5146242 (1992-08-01), Zielinski
patent: 5159412 (1992-10-01), Willenborg et al.

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