Rotary polygon mirror optical scanning device

Details Rotary polygon mirror optical scanning device Rotary polygon mirror optical scanning device

1997-12-24

1999-06-08

Spyrou, Cassandra

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359198, 359216, 359217, 347261, 384114, 384120, G02B 2608

Patent

active

059108533

ABSTRACT:
A rotary polygon mirror optical scanning device comprises a fixed shaft and a rotor having a shaft hole, to which the fixed shaft is inserted, and is rotatably supported against an outer perimeter of the fixed shaft. The device also includes a hydrodynamic bearing mechanism for supporting the rotor. The hydrodynamic bearing mechanism has first and second hydrodynamic pressure generating grooves which are, axially away from one another, formed on at least one of an outer surface of the fixed shaft and an inner surface of the shaft hole of the rotor. A rotary mirror is mounted on the rotor. A motor portion is arranged for rotating the rotor. The fixed shaft has a diameter bearing which is one-third or more of a diameter of a polygonal inscribed circle of the rotary polygon mirror. An area for cutting the first hydrodynamic pressure generating groove is arranged at an axially identical position with the rotary polygon mirror.

REFERENCES:
patent: 5069515 (1991-12-01), Itami et al.
patent: 5142176 (1992-08-01), Takahashi
patent: 5606448 (1997-02-01), Suzuki et al.
patent: 5642150 (1997-06-01), Takahashi

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