Image reading device having variable internal synronization sett

Details Image reading device having variable internal synronization sett Image reading device having variable internal synronization sett

1993-02-26

1996-01-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Synchronization

358409, H04N 136

Patent

active

054813719

ABSTRACT:
An image reading device has a photoelectric transducer for scanning an image to read it line by line and converting the resulting optical data to an electric signal. A driver drives the photoelectric transducer in response to a synchronizing signal. An internal period signal generating circuit generates an internal period signal having a predetermined period. A period setting circuit sets the predetermined period of the internal period signal. A synchronization switching circuit selects and outputs either of the internal period signal or an external period signal sent from the outside of the image reading device as the synchronizing signal. Even when an external period signal from an image recorder including a polygon motor or similar external apparatus is not available or when the external apparatus is not operated, the device can surely read a document. When the device is used as a terminal unit of an external apparatus, it can flexibly match itself to the external apparatus with respect to the synchronizing signal.

REFERENCES:
patent: 4079425 (1978-03-01), Vandling
patent: 5014137 (1991-05-01), Shimada
patent: 5164845 (1992-11-01), Takeuchi
patent: 5202774 (1993-04-01), Ishimitsu
patent: 5239393 (1993-08-01), Takeuchi
patent: 5283662 (1994-02-01), Nakajima

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