Reading apparatus with position calculation and focus adjustment

Details Reading apparatus with position calculation and focus adjustment Reading apparatus with position calculation and focus adjustment

1993-04-01

1994-11-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502012, H01J 4014

Patent

active

053629582

ABSTRACT:
In an image reading apparatus, a spot-light position calculator calculates a distance between a document original and a solid state imaging device using the output signals of a light sensing device, which receives a reflected spot light from the original. A image reading section is moved to a read position according to the calculation results, by a drive mechanism. Thereafter, the original is read. A distorted-image processor extends the data on the image on the undulated portion of the original and corrects the density of the extended image data. The data extension and the density adjustment are performed on the basis of the calculation results from the spot-light position calculator.

REFERENCES:
patent: 5003167 (1991-03-01), Arques
"3-D Measurement Methods Using Active Illumination Techniques" by Yukio Sato and Kazuo Araki, T. IEE Japan, vol. 107-C, No. 7 1987, pp. 625-631.
"Detection of Three Dimensional Coordinates by PSD Camera with Disturbance Correction of Background Light" by Teizo Aida et al., T. IEEE Japan, vol. 107-C, No. 7, 1987, pp. 632-639.

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