Light beam scanning apparatus which controls power and spot shap

Details Light beam scanning apparatus which controls power and spot shap Light beam scanning apparatus which controls power and spot shap

1996-05-24

1999-09-28

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347236, 347247, 250205, G01J 132

Patent

active

059596554

ABSTRACT:
A light beam scanning apparatus in which laser power and spot shape of an emitted laser beam are controlled, has a laser control signal generating part for changing a picture signal to a laser power control signal and a spot shape control signal, a laser power control current generating part which is driven by the laser power control signal, a spot shape control current generating part which is driven by the shape control signal, and a laser beam emission part for emitting a laser beam having a laser power and a spot shape which are controlled by the control signals via a commonly used light wave guiding part, wherein the control signal generating part generates or corrects the control signals based on at least one of the difference between the laser power of a beam to be emitted and a detected laser power, the difference between the spot shape of a beam to be emitted and a detected laser power, a detected temperature at the laser beam emission part, and an effective light emission pixel number.

REFERENCES:
patent: 5130524 (1992-07-01), Egawa et al.
patent: 5146240 (1992-09-01), Hayashi et al.

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