Exposure apparatus and image-forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYasutomo Furuta
Life of this patent
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Abstract
An exposure apparatus includes a printed circuit board on which light-emitting chips each having a light-emitting element array are arranged in a staggered manner along a reference line that is parallel to an axial direction of a photosensitive member, and a rod lens array that images light from the light-emitting chips onto a surface of the photosensitive member. The rod lens array is constituted by two rows of lenses. The reference line is equidistant from central lines of the first and second lens rows. A proportion of a width of the light-emitting element array in a circumferential direction of the photosensitive member to a lens diameter is about 0.28, and an interval between the reference line and each light-emitting element array belongs to a range from 0.56 to 0.84 times the lens diameter.
Claims6
An exposure apparatus comprising:
- a printed circuit board on which a plurality of light-emitting chips each having a light-emitting element array are arranged in a staggered manner along a reference line that is parallel to an axial direction of a photosensitive member;
- and
- a rod lens array configured to image light from the plurality of light-emitting chips onto a surface of the photosensitive member,
- wherein the rod lens array is constituted by two rows of lenses arranged in a close-packed manner,
- the reference line is equidistant from a central line of a first lens row and a central line of a second lens row of the rod lens array on the printed circuit board,
- a proportion of a width of the light-emitting element array in a circumferential direction of the photosensitive member to a lens diameter of the rod lens array is about 0.28, and
- an interval between the reference line and each light-emitting element array belongs to a range from 0.56 to 0.84 times the lens diameter.
An image-forming apparatus comprising:
- an exposure apparatus;
- and
- a photosensitive member,
- wherein the exposure apparatus includes:
- a printed circuit board on which a plurality of light-emitting chips each having a light-emitting element array are arranged in a staggered manner along a reference line that is parallel to an axial direction of a photosensitive member;
- and
- a rod lens array configured to image light from the plurality of light-emitting chips onto a surface of the photosensitive member,
- wherein the rod lens array is constituted by two rows of lenses arranged in a close-packed manner,
- the reference line is equidistant from a central line of a first lens row and a central line of a second lens row of the rod lens array on the printed circuit board,
- a proportion of a width of the light-emitting element array in a circumferential direction of the photosensitive member to a lens diameter of the rod lens array is about 0.28, and
- an interval between the reference line and each light-emitting element array belongs to a range from 0.56 to 0.84 times the lens diameter.
Dependencies are inferred from the claim text.