Optical beam scanning apparatus
AssigneeMinolta Camera Kabushiki Kaisha
InventorsJun Kohsaka, Hiromu Nakamura, Masanori Yamamoto, Shinya Sakanashi
Life of this patent
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Abstract
An optical beam scanning apparatus wherein a resin polygonal scanner deflects a light beam radiated from a laser diode as the polygonal scanner is rotating. The polygonal scanner is pressed by a pressing member against a scanner rest which rotates together with a rotary shaft of a motor and thus fixed on the scanner rest. The pressing member has a plurality of tabs, and the polygonal scanner is pressed evenly when the tabs pierce the polygonal scanner.
Claims33
An optical beam scanning apparatus comprising:
- a polygonal scanner which is made of resin and has a plurality of reflective facets on its periphery;
- a motor which has a rotary shaft for rotating the polygonal scanner;
- a scanner rest for supporting the polygonal scanner thereon, the scanner rest being rotatable together with the rotary shaft of the motor;
- and
- a pressing member which presses the polygonal scanner against the scanner rest to fasten the polygonal scanner to the rotary shaft of the motor, the pressing member pressing the polygonal scanner at such points that forces caused by the pressure and applied to all the reflective facets will be substantially even.
An optical beam scanning apparatus comprising:
- a polygonal scanner which is made of resin and has a plurality of reflective facets in its periphery;
- a motor which has a rotary shaft for rotating the polygonal scanner;
- a scanner rest for supporting the polygonal scanner thereon, the scanner rest being rotatable together with the rotary shaft of the motor;
- and
- a pressing member which presses the polygonal scanner against the scanner rest to fasten the polygonal scanner to the rotary shaft of the motor, the pressing member pressing the polygonal scanner at points within an area supported by the scanner rest.
An optical beam scanning apparatus comprising:
- a polygonal scanner which is made of resin and has a plurality of reflective facets in its periphery;
- a motor which has a rotary shaft for rotating the polygonal scanner;
- a scanner rest for supporting the polygonal scanner thereon, the scanner rest being rotatable together with the rotary shaft of the motor;
- and
- a pressing member which presses the polygonal scanner against the scanner rest to fasten the polygonal scanner to the rotary shaft of the motor, the pressing member pressing the polygonal scanner at points each of which is on an upper surface of the polygonal scanner out of an area enclosed by lines from an axis of rotation of the polygonal scanner and both ends of an effective reflective area of each reflective facet.
Dependencies are inferred from the claim text.