IMAGE FORMING APPARATUS
First Claim
1. An image forming apparatus comprising:
- a light-emitting element that includes light-emitting point groups arranged two-dimensionally; and
an optical system that includes imaging systems focusing light from light-emitting points of the light-emitting point groups, on different positions on a light-receiving surface,wherein the light-emitting point groups and the imaging systems are combined into a plurality of sets,the light-receiving surface has a cylindrical shape,each of the imaging systems has a negative imaging magnification,a plurality of light-emitting point groups provided adjacently in a main scanning direction in the light-emitting element is arranged at different positions in the main scanning direction and in a sub-scanning direction corresponding to the main scanning direction,the imaging systems adjacent to each other have optical axes non-parallel to each other having different angles according to positions in the sub-scanning direction when viewed in a direction of a rotation axis of the light-receiving surface,when a central normal passing through the center of each of the light-emitting point groups is not perpendicular to the light-receiving surface, each of the optical axes has an angle being not zero relative to the central normal, and a plane including the optical axis and the central normal is perpendicular to a rotational symmetry axis corresponding to the rotation axis of the light-receiving surface, andan angle between the optical axis and a line normal to the light-receiving surface at the point of intersection between the optical axis and the light-receiving surface is smaller, in absolute value, than an angle between the central normal and a line normal to the light-receiving surface at the point of intersection between the central normal and the light-receiving surface, and the angles are directed in the same direction.
1 Assignment
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Accused Products
Abstract
An image forming apparatus includes: a light-emitting element that includes light-emitting point groups; and an optical system that includes imaging systems focusing light from light-emitting points of the light-emitting point groups, wherein the light-emitting point groups and the imaging systems are combined into sets, the light-receiving surface has a cylindrical shape, each imaging system has a negative imaging magnification, light-emitting point groups are arranged at different positions, the imaging systems adjacent to each other have optical axes non-parallel to each other, each optical axis has an angle being not zero relative to the central normal, and a plane including the optical axis and the central normal is perpendicular to a rotational symmetry axis, and an angle between the optical axis and a line normal to the light-receiving surface is smaller than an angle between the central normal and a line normal to the light-receiving surface.
1 Citation
11 Claims
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1. An image forming apparatus comprising:
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a light-emitting element that includes light-emitting point groups arranged two-dimensionally; and an optical system that includes imaging systems focusing light from light-emitting points of the light-emitting point groups, on different positions on a light-receiving surface, wherein the light-emitting point groups and the imaging systems are combined into a plurality of sets, the light-receiving surface has a cylindrical shape, each of the imaging systems has a negative imaging magnification, a plurality of light-emitting point groups provided adjacently in a main scanning direction in the light-emitting element is arranged at different positions in the main scanning direction and in a sub-scanning direction corresponding to the main scanning direction, the imaging systems adjacent to each other have optical axes non-parallel to each other having different angles according to positions in the sub-scanning direction when viewed in a direction of a rotation axis of the light-receiving surface, when a central normal passing through the center of each of the light-emitting point groups is not perpendicular to the light-receiving surface, each of the optical axes has an angle being not zero relative to the central normal, and a plane including the optical axis and the central normal is perpendicular to a rotational symmetry axis corresponding to the rotation axis of the light-receiving surface, and an angle between the optical axis and a line normal to the light-receiving surface at the point of intersection between the optical axis and the light-receiving surface is smaller, in absolute value, than an angle between the central normal and a line normal to the light-receiving surface at the point of intersection between the central normal and the light-receiving surface, and the angles are directed in the same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification