Image scanning device

Details Image scanning device Image scanning device

1997-06-19

1999-01-12

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502012, H01J 314

Patent

active

058594272

ABSTRACT:
An image scanning device is provided for reading an image of an object. The image scanning device includes: a linear image sensor outputting an image signal corresponding to a received image; an imaging lens positioned between the object and the image sensor; a scanning system rotatable through a predetermined scanning range around a predetermined axis parallel to the line of image receiving elements to scan an image of the object onto the image sensor; a focusing system for adjusting a focusing condition of the image scanning device; and a controller which, based on an image signal from the image sensor, adjusts the focusing system to set an in-focus focusing condition for a portion of the object located at a substantially central portion of the scanning range. The image scanning system may be set to the center of the scanning range and the controller, using image signals from the image sensor, may monitor the contrast of the image while adjusting the position of the imaging lens until the contrast is maximum.

REFERENCES:
patent: 5095383 (1992-03-01), Omura et al.

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