Diaphragm drive device

Details Diaphragm drive device Diaphragm drive device

1986-10-27

1988-09-20

Adams, Russell E.

3542351, 3542341, G03B 902

Patent

active

047729040

ABSTRACT:
A diaphragm drive device comprising a first yoke having a plurality of radially extending pole teeth toward the optical axis, a second yoke having a plurality of radially extending pole teeth toward the optical axis, the pole teeth of the first and second yokes alternating each other in a common plane, exciting coils for exciting all the pole teeth of the first and second yokes as held on these yokes, and an apertured disc-like permanent magnet arranged to be rotatable in spaced relation to the plane of the pole teeth of the first and second yokes by a constant axial distance, the magnet being made of a mixture of resin and magnetic materials by molding techniques and magnetized in such a way that the magnetic axes of the domains of the magnetic material are oriented toward only one of the radial surfaces of the disc, wherein the apertured disc-shaped permanent magnet is drivingly connected to the diaphragm blades.

REFERENCES:
patent: 4100558 (1978-07-01), Koike et al.
patent: 4113359 (1978-09-01), Koike et al.
patent: 4320950 (1982-03-01), Senuma et al.
patent: 4390262 (1983-06-01), Hirohata et al.
patent: 4460253 (1984-07-01), Kawai et al.
patent: 4470687 (1984-09-01), Saito et al.
patent: 4472039 (1984-09-01), Iwata et al.
patent: 4534624 (1985-08-01), Toda et al.
patent: 4598989 (1986-07-01), Yamada et al.
patent: 4623233 (1986-11-01), Yamada et al.

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