External magnetic field application device including a heat diss

Details External magnetic field application device including a heat diss External magnetic field application device including a heat diss

1993-05-11

1994-11-01

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 66, G11B 1304

Patent

active

053612426

ABSTRACT:
Disclosed is an external magnetic field application device for use in an optical information recording and reproducing apparatus. The device has a winding wound on an outer periphery of a magnetic pole piece and a magnetic plate attached to the magnetic pole piece to form a magnetic circuit. The device includes a heat dissipation member arranged to contact an outer periphery of the winding for conducting heat generated in the winding, when the winding is energized, to the magnetic plate, and a metal plate arranged on top of the heat dissipation member for dissipating heat of the heat dissipation member.

REFERENCES:
patent: 4796241 (1989-01-01), Hayakawa et al.

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