Optical scanning device and image forming apparatus in which a plurality of scanning optical systems except one include a reflecting mirror
First Claim
1. An optical scanning device that scans a plurality of scanned surfaces in a main-scanning direction with a plurality of light beams, the optical scanning device comprising:
- a light source device including at least one light source and configured to emit a plurality of light beams including a plurality of light beams corresponding to at least process colors;
a deflector configured to deflect the plurality of light beams emitted from the light source device; and
a plurality of scanning optical systems configured to guide the plurality of light beams deflected at the deflector to the plurality of corresponding scanned surfaces,wherein;
one light beam in a first waveband of the plurality of light beams corresponding to the process colors enters one scanning optical system of the plurality of scanning optical systems,the one scanning optical system includes an optical member configured to reflect the one light beam and transmit a light beam in a second waveband different from the first waveband,an angle formed between a normal to an incidence plane of the optical member and orthogonal projection to an assumed plane orthogonal to a direction corresponding to the main-scanning direction of an incident path of the light beam to the incidence plane of the optical member is an angle of 0°
or more and an angle of 45°
or less,the scanning optical systems of the plurality of scanning optical systems except the one scanning optical system include a reflecting mirror to reflect the corresponding light beam, andthe angle is smaller than an angle formed between a normal to a reflecting surface of the reflecting mirror and orthogonal projection to an assumed plane of an incident path of the corresponding light beam to the reflecting surface of the reflecting mirror.
1 Assignment
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Accused Products
Abstract
An optical scanning device includes: a light source device that emits five light beams corresponding to four basic colors and a single specific color; and five scanning optical systems corresponding the five light beams. One light beam in a first waveband among the light beams corresponding to the four basic colors enters one scanning optical system of the five scanning optical systems. The one scanning optical system includes a dichroic mirror that transmits a light beam in a second waveband different from the first waveband. An angle θb formed between a normal to the incidence plane of the dichroic mirror and orthogonal projection to an assumed plane orthogonal to the main scanning corresponding direction of the incident path of the light beam to the incidence plane of the dichroic mirror is set at an angle of 0° or more and an angle of 45° or less.
64 Citations
13 Claims
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1. An optical scanning device that scans a plurality of scanned surfaces in a main-scanning direction with a plurality of light beams, the optical scanning device comprising:
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a light source device including at least one light source and configured to emit a plurality of light beams including a plurality of light beams corresponding to at least process colors; a deflector configured to deflect the plurality of light beams emitted from the light source device; and a plurality of scanning optical systems configured to guide the plurality of light beams deflected at the deflector to the plurality of corresponding scanned surfaces, wherein; one light beam in a first waveband of the plurality of light beams corresponding to the process colors enters one scanning optical system of the plurality of scanning optical systems, the one scanning optical system includes an optical member configured to reflect the one light beam and transmit a light beam in a second waveband different from the first waveband, an angle formed between a normal to an incidence plane of the optical member and orthogonal projection to an assumed plane orthogonal to a direction corresponding to the main-scanning direction of an incident path of the light beam to the incidence plane of the optical member is an angle of 0°
or more and an angle of 45°
or less,the scanning optical systems of the plurality of scanning optical systems except the one scanning optical system include a reflecting mirror to reflect the corresponding light beam, and the angle is smaller than an angle formed between a normal to a reflecting surface of the reflecting mirror and orthogonal projection to an assumed plane of an incident path of the corresponding light beam to the reflecting surface of the reflecting mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image forming apparatus comprising:
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a plurality of image carriers including a plurality of image carriers corresponding to at least process colors; and an optical scanning device that scans a plurality of image carriers in a main-scanning direction with a plurality of light beams, wherein; the optical scanning device comprises; a light source device including at least one light source and configured to emit a plurality of light beams including a plurality of light beams corresponding to at least process colors, a deflector configured to deflect the plurality of light beams emitted from the light source device, and a plurality of scanning optical systems configured to guide the plurality of light beams deflected at the deflector to the plurality of corresponding image carriers, one light beam in a first waveband of the plurality of light beams corresponding to the process colors enters one scanning optical system of the plurality of scanning optical systems, the one scanning optical system includes an optical member configured to reflect the one light beam and transmit a light beam in a second waveband different from the first waveband, an angle formed between a normal to an incidence plane of the optical member and orthogonal projection to an assumed plane orthogonal to a direction corresponding to the main-scanning direction of an incident path of the light beam to the incidence plane of the optical member is an angle of 0°
or more and an angle of 45°
or less,the optical scanning device scans one image carrier of the plurality of image carriers corresponding to the process colors with the one light beam, the scanning optical systems of the plurality of scanning optical systems except the one scanning optical system include a reflecting mirror to reflect the corresponding light beam, and the angle is smaller than an angle formed between a normal to a reflecting surface of the reflecting mirror and orthogonal projection to an assumed plane of an incident path of the corresponding light beam to the reflecting surface of the reflecting mirror. - View Dependent Claims (12)
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13. An optical scanning device that scans a plurality of scanned surfaces in a main-scanning direction with a plurality of light beams, the optical scanning device comprising:
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a light source device including at least one light source and configured to emit a plurality of light beams including a plurality of light beams corresponding to at least process colors; a deflector configured to deflect the plurality of light beams emitted from the light source device; and a plurality of scanning optical systems configured to guide the plurality of light beams deflected at the deflector to the plurality of corresponding scanned surfaces, wherein; one light beam in a first waveband of the plurality of light beams corresponding to the process colors enters one scanning optical system of the plurality of scanning optical systems, the one scanning optical system includes an optical member configured to reflect a large quantity of the light beam in the first waveband in concurrence with transmitting a small quantity of the light beam in the first waveband, and transmit a large quantity of light beam in a second waveband different from the first waveband in concurrence with reflecting a small quantity of the light beam in the second waveband, an angle formed between a normal to an incidence plane of the optical member and orthogonal projection to an assumed plane orthogonal to a direction corresponding to the main-scanning direction of an incident path of the light beam to the incidence plane of the optical member is an angle of 0°
or more and an angle of 45°
or less, anda light quantity of the light beam reflected at the optical member in the light beam in the second waveband is smaller than a light quantity of the light beam transmitted through the optical member in the light beam in the first waveband, the scanning optical systems of the plurality of scanning optical systems except the one scanning optical system include a reflecting mirror to reflect the corresponding light beam, and the angle is smaller than an angle formed between a normal to a reflecting surface of the reflecting mirror and orthogonal projection to an assumed plane of an incident path of the corresponding light beam to the reflecting surface of the reflecting mirror.
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Specification