Image reading method and apparatus determining synchronous posit

Details Image reading method and apparatus determining synchronous posit Image reading method and apparatus determining synchronous posit

1993-07-22

1994-02-22

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358497, H01J 314, H04N 121

Patent

active

052890007

ABSTRACT:
An image reading method and apparatus are capable of high-quality reading of a transparent original with an optimum light quantity by maintaining both a transmitting light source unit and a reading scanner at an adequate relative position to keep their optical axes in alignment during scan reading. Such alignment is achieved by providing synchronization in scanning speed by placing either one of the transmitting light source unit and the reading scanner at an arbitrary selected position, scanning the proximity of the selected position with the other, determining a light quantity distribution, determining a synchronous position from the distribution, carrying out such synchronous position detection at two or more distinct positions, and calculating the scanning speed ratio of the transmitting light source unit to the reading scanner from the result. Alternatively, alignment is achieved by carrying out similar synchronous position detection, determining the relative spacing between the base points of said transmitting light source and said reading scanner from the distances from the respective base points to the synchronous position, and matching the scan start positions of the transmitting light source unit and the reading scanner in accordance with the relative spacing.

REFERENCES:
patent: 4893196 (1990-01-01), Koshiyouji et al.
patent: 5107344 (1992-04-01), Nosaki et al.
patent: 5109288 (1992-04-01), Moriya
patent: 5142382 (1992-08-01), Yamada

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