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US 4,366,492 AGranted
Semiconductor laser device
AssigneeCanon Kabushiki Kaisha
InventorTakashi Kitamura
Life of this patent
Estimating the term…
Abstract
A semiconductor laser device of a construction, wherein projection of a laser beam (or rear beam) backwardly from a semiconductor laser element in the device is prevented.
Claims19
A semiconductor laser device, comprising:
- (a) semiconductor laser means for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means therethrough;
- and
- (c) antireflecting means coated on at least a portion of the internal walls of said casing in order to prevent the rear laser beam generated by said semiconductor laser means from being reflected to and transmitted through said optical for emission from said casing window.
1 more element
A semiconductor laser device, comprising:
- (a) a semiconductor laser means for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means;
- therethrough;
- and
- (c) antireflecting means provided on a surface irradiated by the rear laser beam generated by said semiconductor laser means in order to prevent the rear laser beam from being reflected to and transmitted through said optical window for emission from said casing, said antireflecting means comprising a matting material for scattering the rear laser beam.
2 more elements
A semiconductor laser device, comprising:
- (a) semiconductor laser device for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means;
- therethrough;
- and
- (c) antireflecting means provided on a surface of said device irradiated by the rear laser beam generated by said semiconductor laser means in order to prevent the rear laser beam from being reflected to and transmitted through said optical window for emission from said casing, said antireflecting means comprising powdered silica for scattering rear laser beam.
2 more elements
A semiconductor laser device, comprising:
- (a) semiconductor laser device for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means;
- therethrough;
- and
- (c) antireflecting means provided on a surface of said device irradiated by the rear laser beam generated by said semiconductor laser means and comprising absorbing means capable of absorbing the light in the oscillating wavelength range characteristic of said semiconductor laser means in order to prevent the rear laser beam from being reflected to and transmitted through said optical window for emission from said casing.
2 more elements
A semiconductor laser device, comprising:
- (a) semiconductor laser device for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means;
- therethrough, the laser beam emitting portion of said semiconductor laser means being positioned directly below the center of said optical window;
- (c) support means for supporting said semiconductor laser means in said casing;
- and
- (d) blocking means provided on a surface within said casing irradiated by the rear laser beam generated by said semiconductor laser means in order to prevent the rear laser beam being reflected to and transmitted through said optical window for emission from said casing, said blocking means comprising an inclined reflecting face positioned at an oblique angle to the exit face of the front laser beam, dimension of said inclined reflecting face in the direction perpendicular to that in which the front laser beam is emitted from the position directly below the center of said optical window being at least equal to 1/4 of the maximum diameter of said optical window.
3 more elements
A semiconductor laser device, comprising:
- (a) semiconductor laser device for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means therethrough;
- (c) support means for supporting said semiconductor laser means in said casing;
- and
- (d) antireflecting means provided on said support means in an area irradiated by the rear laser beam generated by said semiconductor laser means in order to prevent the rear laser beam being reflected to and transmitted through said optical window for emission from said casing.
2 more elements
A semiconductor laser device, comprising:
- (a) semiconductor laser device for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means therethrough;
- (c) a fiber cable for guiding the rear laser beam generated by said semiconductor laser means in a direction different from the direction of the front laser beam as it is transmitted through said optical window;
- and
- (d) a cavity into which one end of said fiber cable leads for attenuating within said cavity said rear laser beam guided thereto by said fiber cable.
2 more elements
A semiconductor laser device, comprising:
- (a) semiconductor laser device for generating a front laser beam and a rear laser beam;
- (b) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means therethrough;
- (c) blocking means for attenuating the rear laser beam generated by said semiconductor laser means totally inside of said casing in order to prevent the rear laser beam from being reflected to and transmitted through said optical window for emission from said casing.
A laser recording apparatus, comprising:
- (a) semiconductor laser means for generating a front laser beam and a rear laser beam;
- (b) scanning means for scanning said recording medium with the front laser beam generated by said semiconductor laser means;
- (c) modulating means for modulating the output intensity of the front laser beam generated by said semiconductor laser means;
- (d) a casing for covering said semiconductor laser means and provided with an optical window for transmitting the front laser beam generated by said semiconductor laser means therethrough, to emit the front laser beam from a position directly below the center of said optical window;
- and
- (e) support means for supporting said semiconductor laser means in said casing;
- (f) blocking means provided on a surface of said device irradiated by the rear laser beam generated by said semiconductor laser means in order to prevent said rear laser beam being reflected to and transmitted through said optical window for emission from said casing, in said blocking means comprising an inclined reflecting face positioned at an oblique angle to the exit face of said front laser beam;
- the dimension of said inclined reflecting face in the direction perpendicular to the direction in which front laser beam is emitted from said position directly below the center of the optical window being at least equal to 1/4 of the maximum diameter of said optical window.
5 more elements
Dependencies are inferred from the claim text.