Light scanning apparatus
AssigneeCanon Kabushiki Kaisha
InventorJun Koide
Life of this patent
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Abstract
A light scanning apparatus comprises a light source having a plurality of light emitting unit, a deflector for deflecting a plurality of light beams emanated from the light source, a first optical system which is for focusing the plural light beams deflected by the deflector and which is afocal in a refractive power in a sub-scan direction and has an f-.theta. characteristic in a refractive power in a scan direction, and a second optical system which is for directing the light beams from the first optical system to a predetermined plane and is provided for each of the light beams.
Claims46
A light scanning apparatus comprising:
- a light source having a plurality of light emitting units;
- a deflector for deflecting a plurality of light beams emanated from said light source;
- a first optical system for focusing the plural light beams deflected by said deflector, said first optical system being afocal in a refractive power in a sub-scan direction and exhibiting an f-.theta. characteristic in a refractive power in a scan direction;
- and
- a second optical system positioned in proximity to a predetermined plane for directing the light beams from said first optical system to the predetermined plane, said second optical system being provided for each of the light beams.
A light scanning apparatus comprising:
- a light source unit for generating a plurality of light beams;
- deflecting means for deflecting said plurality of light beams emanated from said light source unit;
- a first optical system on which the plurality of light beams deflected by said deflecting means are incident, said first optical system being afocal in a refractive power in a sub-scan direction;
- and
- a second optical system positioned in proximity to a predetermined plane for directing the plurality of light beams from said first optical system to the predetermined plane, said second optical system being provided for each of said plurality of light beams.
A laser beam printer apparatus comprising:
- a light source unit for generating a plurality of light beams;
- deflecting means for deflecting said plurality of light beams emanated from said light source unit;
- a recording medium for receiving the light beams deflected by said deflecting means;
- a first optical system on which the plurality of light beams deflected by said deflecting means are incident, said first optical system being afocal in a refractive power in a sub-scan direction;
- and
- a second optical system provided in proximity to said recording medium for directing the plurality of light beams from said first optical system to said recording medium, said second optical system being provided for each of said plurality of light beams.
A scanning method in a light scanning apparatus, said method comprising the steps of:
- deflecting a plurality of light beams by deflecting means;
- directing said plurality of light beams deflected by said deflecting means to a first optical system which is afocal in a refractive power in a sub-scan direction;
- and
- directing said plurality of light beams from said first optical system to a predetermined plane by a second optical system which is provided in proximity to the predetermined plane for each of said plurality of light beams.
A recording method in a laser beam printer apparatus said method comprising the steps of:
- deflecting a plurality of light beams by deflecting means;
- directing said plurality of light beams deflected by said deflecting means to a first optical system which is afocal in a refractive power in a sub-scan direction;
- and
- directing said plurality of light beams from said first optical system to a recording medium by a second optical system which is provided in proximity to the recording medium for each of said plurality of light beams.
Dependencies are inferred from the claim text.