Laser beam printing machine

Details Laser beam printing machine Laser beam printing machine

1996-09-10

1999-08-24

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347235, 347132, 347261, B41J 247

Patent

active

059430877

ABSTRACT:
A laser beam printing machine according to the present invention includes a polygon mirror motor; a first control circuit which generates, in response to an error in rotation of the polygon mirror motor, a control signal which bring about the rotation of the polygon mirror motor to a target rpm and performs a PWM control; an output circuit which receives data for printing and, in response to the received data, outputs data for controlling a laser beam; a voltage controlled oscillator which generates clock pulses for determining the transmission timing of the data from the output circuit; and a second control circuit which controls, in response to the control signal, a control voltage of the voltage controlled oscillator to follow up the rotation fluctuation of the polygon mirror motor.

REFERENCES:
patent: 4613877 (1986-09-01), Spencer et al.
patent: 4862289 (1989-08-01), Shimada
patent: 4975626 (1990-12-01), Yagi et al.
patent: 5541637 (1996-07-01), Ohashi et al.

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