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H - Electricity

04

N

350/16

H04N 1/04 (2006.01) H04N 1/028 (2006.01) H04N 5/232 (2006.01)

Patent

CA 1210133

ABSTRACT The state of focus of an image of a document is converted into a video signal by sequentially inspecting the incident light level at points within the image and generating an electrical signal having a parameter which varies with the light level. A device for achieving this result includes a circuit responsive to the electrical signal from sequential inspection of the image for integrating amplitude variations thereof to produce a varying amplitude focus indication signal. An indicator comprises a linear array of lamps, the operating current for the lamps being related to the ampli- tude of the focus indication signal, such that, with increasing amplitude of the latter, more of the lamps are caused to be illuminated or vice versa, where all the lamps are illuminated to indicate a state of poor focus. The focus of the image is adjusted in response to visual inspection of the illuminated lamps.

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