Optical deflector with a pneumatic and a magnetic bearing

Details Optical deflector with a pneumatic and a magnetic bearing Optical deflector with a pneumatic and a magnetic bearing

1986-09-24

1988-02-23

Arnold, Bruce Y.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 905, 350486, G02B 2608, H02K 516

Patent

active

047266406

ABSTRACT:
An optical deflector for deflecting a laser beam from a laser by rotating a polygon mirror uses a dynamic pressure pneumatic bearing as a radial bearing and a magnetic bearing as a thrust bearing. The deflector includes a hollow rotor rotatable integrally with the mirror, a stationary shaft received in said hollow rotor, a casing member accommodating the rotor and stationary shaft, and an annular rotor magnet assembly mounted on the outer periphery of the rotor. A first rotary magnet is mounted in an upper end portion of a rotary shaft and a first stationary magnet in an upper end portion of the stationary shaft in such a manner as to face each other with the same polarity, a repulsive force acting between the two magnets serving as a thrust magnetic bearing. A second stationary magnet is arranged to face the first rotary magnet with the same polarity. Further, a second rotary magnet is mounted in a lower end portion of the rotary shaft and a third stationary magnet in a lower end portion of the stationary shaft in such a manner as to face each other with the same polarity.

REFERENCES:
patent: 3791704 (1974-02-01), Perper
patent: 4153993 (1979-05-01), Kataoka et al.
patent: 4154489 (1979-05-01), Lyman
patent: 4303281 (1981-12-01), Irby
patent: 4443043 (1984-04-01), Yamaguchi
patent: 4523800 (1985-06-01), Yamashita et al.
patent: 4538081 (1985-08-01), Kamiya et al.

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