Fixing device and image forming apparatus

摘要

A fixing device includes a light source that radiates a laser beam, a converging member that converges the laser beam, and a roller that is positioned so as to be in contact with the converging member and that transports a recording medium, which enters between the roller and the converging member. The converging member includes a lens that converges the laser beam, which is incident on a first surface of the lens, and emits the laser beam from a second surface of the lens and a holding member made of a material that does not transmit the laser beam, the holding member holding the lens. In the cross-sectional view perpendicular to a rotation axis of the roller, a contact surface in which the roller and the converging member are in contact with each other includes at least a portion of a surface of the holding member and the second surface.

主权项

1. A fixing device comprising:
a light source configured to radiate a laser beam; a converging member configured to converge the laser beam,
wherein the converging member comprises:
a lens having a first surface and a second surface,
wherein the lens is configured to converge the laser beam, which has been incident on the first surface, andwherein the lens is configured to emit the laser beam from the second surface;a holding member comprising a first material configured prevent transmission of the laser beam,
wherein the holding member is configured to hold the lens; anda cylinder member comprising a second material configured to transmit the laser beam,wherein the lens and the holding member are accommodated in the cylinder member, andwherein the cylinder member is configured to rotate relative to the lens and the holding member; and a roller that is disposed at a position where the roller is in contact with the cylinder member, wherein the roller is configured to transport a recording medium, which enters between the roller and the cylinder member, and wherein in a cross-sectional view perpendicular to a rotation axis of the roller, a contact surface at which the roller and the cylinder member are in contact with each other is longer than the second surface.