Polygonal mirror with a reflection film and method for manufacturing the same
AssigneeKabushiki Kaisha Toshiba
InventorsMizuo Morita, Hiroshi Kaneko
Life of this patent
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Abstract
A polygonal mirror includes a base body having a circumferential surface composed of a plurality of plane surfaces or a columnar surface, a surface element, formed on the circumferential surface of the base body with a synthetic resin, whose circumferential surface is formed in a non-spherical shape, a reflection film formed on the surface of the surface element.
Claims10
A polygonal mirror for reflecting an optical beam from a generator, comprising:
- a base body having a circumferential surface composed of a plurality of flat surfaces;
- a surface element attached to the circumferential surface of the base body to cover each of the flat surfaces, the surface element corresponding to each of the flat surfaces being formed an a non-spherical surface which has a continuously varied curvature;
- and
- reflection means, attached on the circumferential surface of the surface element to cover each of the non-spherical surfaces, for reflecting the optical beam.
A method for manufacturing a polygonal mirror having a non-spherical circumferential surface, comprising the steps of:
- preparing a base body having a circumferential surface composed of a plurality of flat surfaces;
- forming a non-spherical shaped surface element on the circumferential surface of the base body with a resin, to cover each of the flat surfaces, the surface element corresponding to each of the flat surfaces being formed as a non-spherical surface which has a continuously varied curvature;
- and
- forming a reflection film on the surface element to cover each of the non-spherical surfaces.
A method for manufacturing a polygonal mirror having a non-spherical surface, comprising the steps of:
- forming a base body having a circumferential surface composed of a plurality of flat surfaces and a central hole from a material which transmits ultraviolet rays;
- placing the base body in a mold housing which has a non-spherical shaped inner surface;
- filling an ultraviolet hardening resin between the circumferential surface of the base body and the mold housing to form a surface element on the base body, the surface element corresponding to each of the flat surfaces being formed as a non-spherical surface which has a continuously varied curvature;
- radiating ultraviolet rays toward the surface element through the central hole and the base body to cure the ultraviolet hardening resin;
- and
- forming a reflection film on the surface element to cover each of the non-spherical surfaces.
A system for reflecting a laser beam to an image carrier having an image forming surface, comprising:
- means for radiating a laser beam controlled by an image signal;
- and
- rotatable mirror means for reflecting the laser beam toward the image carrier to scan the image forming surface of the image carrier, the mirror means including,
- a base body having a circumferential surface composed of a plurality of flat surfaces;
- a surface element, formed on the circumferential surface of the base body to cover each of the flat surfaces, the surface element corresponding to each of the flat surfaces being formed as a non-spherical surface which has a continuously varied curvature;
- and
- reflection means, attached on the circumferential surface of the surface element to cover each of the non-spherical surfaces, for reflecting the laser beam.
Dependencies are inferred from the claim text.