Automatic focus adjustment system

Details Automatic focus adjustment system Automatic focus adjustment system

1990-06-07

1991-10-29

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 1336, H04N 5232

Patent

active

050619543

ABSTRACT:
An automatic focus adjustment system comprises a focusing device which varies an image forming position; and a control circuit which is capable of setting first and second focusing modes. In the first focusing mode, the control cirucit causes the focusing device to move to an in-focus point within its morning area. In the second focusing mode, the control circuit causes the focusing device to move to an in-focus point on the nearest focusing distance side. The control circuit is arranged to divide a moving range of the focusing device into a first area and a second area which is set on the nearest focusing distance side of the first area to make the focusing device movable within the first area in the first focusing mode, and to make it movable within both the first and second areas in the second focusing mode.

REFERENCES:
patent: 4592638 (1986-06-01), Koneda et al.
patent: 4611244 (1986-09-01), Hanma et al.
patent: 4660954 (1987-04-01), Fujita et al.
patent: 4825237 (1989-04-01), Hatase et al.

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