Image forming apparatus, drum unit, and manufacturing method for the image forming apparatus
First Claim
1. An image forming apparatus, comprising:
- a photosensitive drum assembly comprising;
a photosensitive drum; and
a flange disposed at an end of the photosensitive drum in an axial direction of an axis of the photosensitive drum, the flange contacting an inner surface of the photosensitive drum;
an exposure head comprising;
a plurality of light emitters aligned along the axial direction;
a lens array focusing light from the light emitters on the photosensitive drum; and
a head frame supporting the light emitters and the lens array, anda bearing directly supporting the flange rotatably, the bearing including a first contact face, the first contact face being in contact with the exposure head to define a distance between the lens array and the photosensitive drum along a direction of an optical axis of the light.
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Accused Products
Abstract
An image forming apparatus, having a photosensitive drum assembly, an exposure head, and a bearing, is provided. The photosensitive drum assembly includes a photosensitive drum and a flange disposed at an end of the photosensitive drum in an axial direction of an axis of the photosensitive drum. The flange contacts an inner surface of the photosensitive drum. The exposure head includes a plurality of light emitters aligned along the axial direction of the photosensitive drum, a lens array focusing light from the light emitters on the photosensitive drum, and a head frame to support the light emitters and the lens array. The bearing has a first contact face to contact the exposure head to define a distance between the lens array and the photosensitive drum along a direction of an optical axis of the light.
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Citations
20 Claims
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1. An image forming apparatus, comprising:
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a photosensitive drum assembly comprising; a photosensitive drum; and a flange disposed at an end of the photosensitive drum in an axial direction of an axis of the photosensitive drum, the flange contacting an inner surface of the photosensitive drum; an exposure head comprising; a plurality of light emitters aligned along the axial direction; a lens array focusing light from the light emitters on the photosensitive drum; and a head frame supporting the light emitters and the lens array, and a bearing directly supporting the flange rotatably, the bearing including a first contact face, the first contact face being in contact with the exposure head to define a distance between the lens array and the photosensitive drum along a direction of an optical axis of the light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image forming apparatus, comprising:
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a drum unit comprising a photosensitive drum; and an exposure head, comprising; a plurality of light emitters aligned along a direction of a rotation axis of the photosensitive drum; a lens array focusing light from the light emitters on the photosensitive drum; a head frame supporting the light emitters and the lens array, the head frame having a reference face facing toward the rotation axis; a solid spacer having a first face, the first face facing toward the reference face, and a second face, the second face contacting the drum unit; and a sheet-like spacer interposed between the reference face and the first face. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method to manufacture an image forming apparatus, the image forming apparatus comprising:
- a drum unit including a photosensitive drum and an exposure head;
the exposure head including a plurality of light emitters aligned along a direction of a rotation axis of the photosensitive drum, a lens array focusing light from the light emitters on the photosensitive drum, a head frame supporting the light emitters and the lens array, the head frame having a reference face facing toward the rotation axis, and a solid spacer having a first face facing toward the reference face and a second face contacting the drum unit, and a sheet-like spacer interposed between the reference face and the first face,the method comprising; obtaining a position of a focal point of the exposure head with respect to the reference face and a length between the first face and the second face in a direction of an optical axis of the light from the light emitters; determining the sheet-like spacer to be adopted based on the obtained position of the focal point and the obtained length; and assembling the adopted sheet-like spacer into the exposure head at a position between the reference face and the first face.
- a drum unit including a photosensitive drum and an exposure head;
Specification