Exposure head and image forming apparatus
AssigneeSeiko Epson Corporation
InventorsTakeshi Sowa, Ken Ikuma
Life of this patent
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Abstract
An image forming apparatus includes an image carrier having a curvature in a first direction; and an exposure head including a first light emitting element that emits a light having a wavelength λ11 and a light having a wavelength λ12, a first optical system that converges each of the light emitted from the first light emitting element onto the image carrier, a second light emitting element, and a second optical system that converges a light emitted from the second light emitting element onto the image carrier, wherein a position at which the first optical system converges each of the light and a position at which the second optical system converges the light are different from each other with respect to the first direction.
Claims8
An image forming apparatus comprising:
- an image carrier having a curvature in a first direction;
- and
- an exposure head including
- a first light emitting element that emits a light having a wavelength λ11 and a light having a wavelength λ12,
- a first optical system that converges a light emitted from the first light emitting element onto the image carrier,
- a second light emitting element, and
- a second optical system that converges a light emitted from the second light emitting element onto the image carrier,
- wherein a position at which the first optical system converges light and a position at which the second optical system converges the light are different from each other with respect to the first direction,
- wherein the first optical system focuses the light having the wavelength λ11 at an imaging position P11 and focuses the light having the wavelength λ12 at an imaging position P12, the imaging position P11 and the imaging position P12 being different from each other with respect to an optical axis direction of the first optical system, and
- wherein a distance Δ1 between the imaging position P11 and the imaging position P12 with respect to the optical axis direction of the first optical system is equal to or larger than a distance d between an intersection point I1 and an intersection point I2 with respect to the optical axis direction of the first optical system, the intersection point I1 being a point at which the optical axis of the first optical system intersects the image carrier, the intersection point I2 being a point at which an optical axis of the second optical system intersects the image carrier, wherein the distance d is a positive number.
An exposure head comprising:
- a first light emitting element that emits a light having a wavelength λ11 and a light having a wavelength λ12;
- a first optical system that converges a light emitted from the first light emitting element onto an exposure surface having a curvature in a first direction;
- a second light emitting element;
- and
- a second optical system that converges a light emitted from the second light emitting element onto the exposure surface,
- wherein a position at which the first optical system converges the light and a position at which the second optical system converges the light are different from each other with respect to the first direction,
- wherein the first optical system focuses the light having the wavelength λ11 at an imaging position P11 and focuses the light having the wavelength λ12 at an imaging position P12, the imaging position P11 and the imaging position P12 being different from each other with respect to an optical axis direction of the first optical system, and
- wherein a distance Δ1 between the imaging position P11 and the imaging position P12 with respect to the optical axis direction of the first optical system is equal to or larger than a distance d between an intersection point I1 and an intersection point I2 with respect to the optical axis direction of the first optical system, the intersection point I1 being a point at which the optical axis of the first optical system intersects the exposure surface, the intersection point I2 being a point at which an optical axis of the second optical system intersects the exposure surface, wherein the distance d is a positive number.
Dependencies are inferred from the claim text.