Apparatus for reading character or graphics image on document

Details Apparatus for reading character or graphics image on document Apparatus for reading character or graphics image on document

1990-06-21

1992-09-22

Boudreau, Leo H.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358474, 358412, 355235, H04N 104

Patent

active

051502275

ABSTRACT:
An apparatus is capable of reading a character or graphics image on a document at a plurality of reading linear densities. An illuminating device for illuminating the document, a focusing device for focusing the light beam reflected by the document, and a CCD reading sensor for converting the focused light beam into an electric image signal, are integrally assembled together to constitute a carriage device. This carriage device is shifted in a desirable shifting which is determined on the basis of the reading sensitivity of the CCD reading sensor and which corresponds to the linear reading density. The rotation speed of a driving device used for driving the carriage device is reduced to a desirable value by means of a transmission, the conversion ratio of which is determined on the basis of the least common multiple (LCM) of a plurality of reading linear densities. The driving pulses which should be supplied to the driving device can be easily calculated by use of the product of the "reference pulse " .phi.p and the "multiplier unit" Un, which are also determined on the basis of the above least common multiple.

REFERENCES:
patent: 4159488 (1979-06-01), Tanaka et al.
patent: 4571061 (1986-02-01), Osanai et al.
patent: 4943870 (1990-07-01), Sugishima

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