Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1993-02-04
1998-04-21
Fuller, Benjamin R.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347252, 347144, 358298, B41J 247, B41J 2435, G02B 2602, G03B 2772
Patent
active
057423237
ABSTRACT:
An image forming apparatus which can form gray-scale images comprises a pulse width modulation device for outputting a pulse width modulation signal according to image data, a light emitting device for emitting modulated light in response to the pulse width modulation signal outputted from the pulse width modulation device, a detecting device for detecting quantity of the modulated light, a current control device for controlling, at a time when the light emitting device emits modulated light continuously, current to be supplied to the light emitting device in accordance with the quantity of light detected by the detecting device, and a condition control device for controlling a condition of the pulse width modulation device according to the quantity of light detected by the detecting device at a time when the light emitting device emits the modulated light according to the pulse width modulation signal.
REFERENCES:
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4837787 (1989-06-01), Takesue et al.
patent: 4862289 (1989-08-01), Shimada
patent: 5153609 (1992-10-01), Ando et al.
Canon Kabushiki Kaisha
Fuller Benjamin R.
Gordon Raquel Yvette
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