Two axis linear motor for optical focusing and tracking system i

Details Two axis linear motor for optical focusing and tracking system i Two axis linear motor for optical focusing and tracking system i

1982-12-09

1986-05-06

Duggan, Donovan F.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Plural linear-movement motors

318135, 318115, 310 13, 310 27, 358128, H02K 4102

Patent

active

045874662

ABSTRACT:
A two axis linear motor for carrying the objective lens for optical focusing and optical tracking in an optical recording system has a stationary structure for providing a magnetic field and a moving armature structure. The stationary structure may have two permanent magnets and several pole pieces to properly shape the field with respect to the armature. In one embodiment, a central elongated pole piece and two parallel adjacent elongated pole pieces which are associated with two permanent magnets to form flux gaps with the central pole piece. Flux returns to the magnets through a lower pole piece to which the central pole piece is attached. The central and lower pole pieces have an aperture through which the laser beam may pass on its way to and from the objective lens.

REFERENCES:
patent: 3641583 (1972-02-01), Cless et al.
patent: 3745433 (1973-07-01), Kelby, Jr. et al.
patent: 3771034 (1973-11-01), Wallskog
patent: 3771035 (1973-11-01), Cless
patent: 3881139 (1975-04-01), Inaba et al.
patent: 4135206 (1979-01-01), Kleuters et al.
patent: 4421997 (1983-12-01), Forys

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