Initial set-up procedure for an auto-focus lens

Details Initial set-up procedure for an auto-focus lens Initial set-up procedure for an auto-focus lens

1991-08-23

1993-06-15

Fuller, Benjamin

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346108, 346139R, H04N 121

Patent

active

052203441

ABSTRACT:
An imaging system comprising a source of light movable with respect to an image carrier element and projectable thereon to generate an image, and an auto-focusing system for focusing the image-generating light source. The auto-focus system includes a second beam of light of a wavelength selected not to be actinic with respect to the image carrier element. The initial set up of the auto-focus system is enhanced by the use of the focusing system and a sensor for indicating the output of the focus photodetector to register a zero output which indicates the initial set position.

REFERENCES:
patent: 4435055 (1984-03-01), Berdat et al.
patent: 4975714 (1990-12-01), Rose

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