Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-11-13
2007-11-13
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S236000, C347S234000, C347S236000
Reexamination Certificate
active
11036025
ABSTRACT:
A light beam scanning device is disclosed that includes a light emission source to emit a light beam, a deflection part to deflect the emitted light beam in the main scanning direction, first and second light beam detection parts to detect the deflected light beam at first and second positions, respectively, outside an image area on the opposite sides thereof in the main scanning direction, a time difference measurement part to measure the time difference between the light beam detections by the first and second light beam detection parts, and a control part to perform control so as to correct image magnification in the main scanning direction in the image area from the measured time difference. The control part performs control so that the condition of the amount of light at the time of detecting the light beam by the first and second light beam detection parts is constant.
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Pyo Kevin
Ricoh & Company, Ltd.
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