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Optical-deflection-scanning-apparatus

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Optical deflection/scanning apparatus

Details

Inventors: Miyamoto, Hideyuki;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Spyrou; Cassandra
Assistant Examiner: Cherry; Euncha
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

An optical deflection/scanning apparatus includes a rotary polygon mirror for reflectively scanning a light beam and a motor for rotating the rotary polygon mirror. The motor has a rotor yoke and a rotor magnet. The rotor magnet is attached inside of the rotor yoke such that a curved portion of the rotor yoke projects vertically from one end of the rotor magnet so as to prevent any trouble caused on the lower end of the rotor due to a centrifugal force during rotation of the rotary polygon mirror.

DETAILED DESCRIPTION The present invention has been made in consideration of the above problems of the prior art, and has as its object to provide an optical deflection/scanning apparatus in which the speed of a rotary polygon mirror can be greatly increased while preventing troubles such as separation and fracture of the lower end of the rotor of a motor by a centrifugal force during the rotation of the rotary polygon mirror.
To achieve the above object, according to the present invention, there is provided an optical deflection/scanning apparatus comprising a rotary polygon mirror for reflecting a light beam, and a motor for rotating the rotary polygon mirror, the motor having a rotor yoke with a curved portion at one end, and a rotor magnet attached to an inside of the rotor yoke, wherein the curved portion of the rotor yoke projects from one end of the rotor magnet in a direction of height.
The optical deflection/scanning apparatus may comprise a rotary polygon mirror for reflecting a light beam, and a motor for rotating the rotary polygon mirror, the motor having a rotor yoke with a curved portion at one end, and a rotor magnet attached to an inside of the rotor yoke, wherein one end of the rotor magnet is made locally thin at the same level as the curved portion of the rotor yoke.
The optical deflection/scanning apparatus may comprise a rotary polygon mirror for reflecting a light beam, and a motor for rotating the rotary polygon mirror, the motor having a rotor yoke with a curved portion at one end, and a rotor magnet attached to an inside of the rotor yoke, wherein a gap between one end of the rotor magnet and the curved portion of the rotor yoke is filled with a filler.
The optical deflection/scanning apparatus may comprise a rotary polygon mirror for reflecting a light beam, and a motor for rotating the rotary polygon mirror, the motor having a rotor yoke with a curved portion at one end, and a rotor magnet attached to an inside of the rotor yoke, wherein an array of dimples of the rotor magnet is arranged at a remaining portion except for one end at the same level as the curved portion of the rotor yoke

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