×

IMAGE FORMING APPARATUS

  • US 20200133157A1
  • Filed: 10/17/2019
  • Published: 04/30/2020
  • Est. Priority Date: 10/31/2018
  • Status: Active Grant
First Claim
Patent Images

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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×