Image forming apparatus with pulse width modulated laser driver
First Claim
1. An image processing apparatus comprising:
- gradation processing means for processing gradation data to generate a modulation signal for modulating a beam emitted from a light source;
bias current setting means for variably setting a bias current which is supplied to said light source; and
condition setting means for setting a condition of said gradation processing means to correct a rising characteristic of said light source which varies depending upon the bias current variably set by said bias current setting means.
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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.
16 Citations
10 Claims
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1. An image processing apparatus comprising:
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gradation processing means for processing gradation data to generate a modulation signal for modulating a beam emitted from a light source; bias current setting means for variably setting a bias current which is supplied to said light source; and condition setting means for setting a condition of said gradation processing means to correct a rising characteristic of said light source which varies depending upon the bias current variably set by said bias current setting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification