Optical scanning device and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsShinsuke Miyake, Nobuaki Kubo
Life of this patent
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Abstract
A light beam splitting element that is arranged on an optical path of a light beam emitted from a VCSEL element splits an incident light beam into a first light beam and a second light beam. An optical system focuses the first light beam on the scanning surface and moves an optical spot formed by a focused light beam on the scanning surface in the main scanning direction. A light receiving element that is mounted on a circuit board receives the second light beam. A dust-proof member bridges a space between the circuit board and a circuit-board holding member that holds the circuit board and surrounds the light receiving element.
Claims15
An optical scanning device that scans a scanning surface with a light beam in a main scanning direction, the optical scanning device comprising:
- a vertical cavity surface emitting laser element that emits a light beam;
- a light beam splitting element that is arranged on an optical path of the light beam and splits an incident light beam into a first light beam and a second light beam;
- an optical system that focuses the first light beam on the scanning surface and moves an optical spot formed by a focused light beam on the scanning surface in the main scanning direction;
- a light receiving element that receives the second light beam;
- a circuit board on which the light receiving element is mounted;
- a circuit-board holding member that holds the circuit board;
- and
- a dust-proof member that bridges a space between the circuit board and the circuit-board holding member and surrounds the light receiving element.
An image forming apparatus comprising:
- at least one image carrier;
- and
- at least one optical scanning device that scans the image carrier with a light beam modulated to image data in a main scanning direction, the optical scanning device including
- a vertical cavity surface emitting laser element that emits a light beam,
- a light beam splitting element that is arranged on an optical path of the light beam and splits an incident light beam into a first light beam and a second light beam,
- an optical system that focuses the first light beam on the scanning surface and moves an optical spot formed by a focused light beam on the scanning surface in the main scanning direction,
- a light receiving element that receives the second light beam,
- a circuit board on which the light receiving element is mounted,
- a circuit-board holding member that holds the circuit board, and
- a dust-proof member that bridges a space between the circuit board and the circuit-board holding member and surrounds the light receiving element.
Dependencies are inferred from the claim text.