Optical deflector

Details Optical deflector Optical deflector

1985-05-20

1986-08-26

Corbin, John K.

G02B 2610

Patent

active

046079084

ABSTRACT:
In an optical deflector of a polygonal mirror type, a rotating shaft is supported by a pair of journal bearings of a herringbone dynamic pressure type and a magnetic thrust bearing. The magnetic thrust bearing comprises first and second annular magnets. The first annular magnet is coaxially fixed to the shaft and has a first magnetic pole arrangement on its outer surface. The second annular magnet is fixed to a housing, and has its inner surface opposed to the outer surface of the first magnet and magnetized with a pole arrangement different from the pole arrangement of the first magnet, so that the first and second magnet attract one another to suspend the shaft. Ferromagnetic plates are fixed on both upper and lower surfaces of the first and second magnets.

REFERENCES:
patent: 4443043 (1984-04-01), Yamaguchi
patent: 4523800 (1985-06-01), Yamashita et al.

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