Polygonal mirror optical deflector

Details Polygonal mirror optical deflector Polygonal mirror optical deflector

1983-07-14

1985-06-18

Skudy, R.

Cutlery

308 10, 310 90, 384115, G02B 2717

Patent

active

045238006

ABSTRACT:
A shaft is fixed within a motor housing in an electric motor unit. The shaft is provided with bearing sections having herringbone-shaped grooves formed therein. The shaft is inserted into a hollow cylindrical spindle and the journal sections in the smooth inner surface of the spindle are allowed to face the bearing sections so as to constitute a dynamic pressure type radial bearing supporting the spindle in the radial direction. Stator ring magnets are fixed to the motor housing, and rotor ring magnets are fixed to the hollow cylindrical shaft. The inner surface of the stator magnets faces the outer surface of the ring magnets. These magnets are magnetized such that the mutually facing regions have opposite magnetic poles. The stator and rotor magnets form a magnetic thrust bearing; that is, the spindle is suspended by the attractive force generated between the magnets.

REFERENCES:
patent: 2766695 (1956-10-01), Gailloud
patent: 2904709 (1959-09-01), Lautner
patent: 3851933 (1974-12-01), Jacobson
patent: 4438987 (1984-03-01), Kapaan
patent: 4443043 (1984-04-01), Yamaguchi
Nikkei Mechanical; 1981/11/9; pp. 33, 34.
NHK Lab's Note; No. 242; Y. Kameyama et al.; 10/79; pp. 3-10.

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