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US 8,896,893 B2Granted
Light scanning apparatus and image forming apparatus using the same
AssigneeCanon Kabushiki Kaisha
InventorGenichiro Kudo
Life of this patent
Estimating the term…
Abstract
The object of the present invention is to provide a light scanning apparatus of a simple arrangement which can reduce print misregistration of respective beams in a main scanning direction in an image region even when an inexpensive imaging optical unit which forms a spot image on the image region of a surface to be scanned, and can form a high-resolution image, and an image forming apparatus using the same.
Claims7
A light scanning apparatus comprising:
- a deflection unit configured to deflect a first beam and a second beam from a light source unit, which includes a first light-emitting point which intermittently emits the first beam and a second light-emitting point which intermittently emits the second beam, along a main scanning direction;
- and
- an imaging optical system configured to focus the first beam and the second beam emitted from the deflection unit on a surface to be scanned so as to form a plurality of spots using the first beam and a plurality of spots using the second beam,
- wherein letting a first spot and a second spot be two neighboring spots of the plurality of spots formed by the first beam, and a third spot and a fourth spot be two spots of the plurality of spots formed by the second beam having the same positions as the first spot and the second spot in the main scanning direction, a time difference when the first light-emitting point emits the beam so as to form the first spot and the second spot and a time difference when the second light-emitting point emits the beam so as to form the third spot and the fourth spot are different from each other.
1 more element
An image forming apparatus comprising:
- a deflection unit configured to deflect a first beam and a second beam from a light source unit, which includes a first light-emitting point which intermittently emits the first beam and a second light-emitting point which intermittently emits the second beam, along a main scanning direction;
- an imaging optical system configured to focus the first beam and the second beam emitted from the deflection unit on a surface to be scanned so as to form a plurality of spots using the first beam and a plurality of spots using the second beam, wherein letting a first spot and a second spot be two neighboring spots of the plurality of spots formed by the first beam, and a third spot and a fourth spot be two spots of the plurality of spots formed by the second beam having the same positions as the first spot and the second spot in the main scanning direction, a time difference when the first light-emitting point emits the beam so as to form the first spot and the second spot and a time difference when the second light-emitting point emits the beam so as to form the third spot and the fourth spot are different from each other,
- a photosensitive body arranged on the surface to be scanned,
- a developing unit configured to develop an electrostatic latent image formed on the photosensitive body by a light beam scanned by the light scanning apparatus as a toner image,
- a transferring unit configured to transfer the developed toner image onto a transfer material, and
- a fixing unit configured to fix the transferred toner image onto the transfer material.
3 more elements
An image forming apparatus comprising:
- a deflection unit configured to deflect a first beam and a second beam from a light source unit, which includes a first light-emitting point which intermittently emits the first beam and a second light-emitting point which intermittently emits the second beam, along a main scanning direction;
- an imaging optical system configured to focus the first beam and the second beam emitted from the deflection unit on a surface to be scanned so as to form a plurality of spots using the first beam and a plurality of spots using the second beam, wherein letting a first spot and a second spot be two neighboring spots of the plurality of spots formed by the first beam, and a third spot and a fourth spot be two spots of the plurality of spots formed by the second beam having the same positions as the first spot and the second spot in the main scanning direction, a time difference when the first light-emitting point emits the beam so as to form the first spot and the second spot and a time difference when the second light-emitting point emits the beam so as to form the third spot and the fourth spot are different from each other, and
- a printer controller configured to convert code data input from an external apparatus into an image signal and to input the image signal to the light scanning apparatus.
Dependencies are inferred from the claim text.