Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-05-14
1988-01-05
Dwyer, James L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
354402, H04N 538
Patent
active
047179597
ABSTRACT:
An automatic focusing device for use with a solid-state self-scanned image sensor having a rectangular light detecting area for scanning an object image and converting the same to a video signal, including a focus detecting means, a driver means and a control means. The focus detecting means produces a focus signal from the video signal. The driver means moves a focusing lens group in an image-forming lens system in one direction or the other along its optical axis in increments or steps each equal to a predetermined small distance .DELTA.x. The control means is responsive to the focus signal for controlling the driver means to bring the lens group into a position in which a maximum focus signal is produced. Even after the lens group has been brought into the properly focused position, the control means controls the focus detecting means to generate a focus signal and resumes the focusing process when the generated focus signal varies beyond a certain value.
REFERENCES:
patent: 4422097 (1983-12-01), Inuiya
patent: 4615598 (1986-10-01), Koshiishi
Dwyer James L.
Ricoh & Company, Ltd.
Schroeder L. C.
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