Abstract A laser beam recording apparatus is provided with a semiconductor laser for producing a laser beam, and a beam scanning system for scanning the laser beam on a photosensitive material. A laser operation control circuit produces a light emission level instructing signal corresponding to an image signal and controls a drive current for the semiconductor laser over a natural light emission region and a laser oscillation region on the basis of the light emission level instructing signal, thereby to modulate the intensity of the laser beam. A device superimposes a radio-frequency current upon the drive current for the semiconductor laser only in a region in which the drive current exceeds a predetermined value.
A laser beam recording apparatus provided with a semiconductor laser for producing a laser beam, a beam scanning system for scanning the laser beam on a photosensitive material, and a laser operation control circuit for producing a light emission level instructing signal corresponding to an image signal, and controlling a drive current for the semiconductor laser over a natural light emission region and a laser oscillation region on the basis of the light emission level instructing signal, thereby to modulate the intensity of the laser beam, wherein the improvement comprises the provision of a means for superimposing a radio-frequency current upon the drive current for the semiconductor laser only in a region in which the drive current exceeds a predetermined value.
Claim 2
Dependent Claim
121 words
A laser beam recording apparatus provided with a semiconductor laser for producing a laser beam, a beam scanning system for scanning the laser beam on a photosensitive material, and a laser operation control circuit for producing a light emission level instructing signal corresponding to an image signal, and controlling a drive current for the semiconductor laser over a natural light emission region and a laser oscillation region on the basis of the light emission level instructing signal, thereby to modulate the intensity of the laser beam, wherein the improvement comprises the provision of a means for superimposing a radio-frequency current upon the drive current for the semiconductor laser only in a region in which the drive current exceeds a predetermined value.
Claim 3
Dependent Claim
40 words
An apparatus as defined in claim 1 wherein said means for superimposing the radio-frequency current upon the drive current for the semiconductor laser increases an amplitude of the radio-frequency current as the drive current for the semiconductor laser becomes larger.