Linear actuator for driving an optical head incorporated in an o

Details Linear actuator for driving an optical head incorporated in an o Linear actuator for driving an optical head incorporated in an o

1990-06-13

1994-05-31

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4416, 359814, 359824, G11B 709

Patent

active

053175522

ABSTRACT:
In an electro-magnetic actuator, an objective lens is mounted on a lens holder which is elastically supported by two leaf springs and a focusing coil is wound around the lens holder. The lead springs is fixed on a carriage to which tracking coil is also fixed. Guide roller mechanisms are provided on the both sides of the tracking coil and are slidably mounted on guide rails, respectively. The tracking coil are so arranged as to be extended in magnetic gaps of magnetic circuits disposed between the carrier and the guide rails. In each of the magnetic circuit, first and second yokes are so faced to each other as to defined the magnetic gap, a pair of permanent magnets are interposed between the first and second yokes, a third yoke also so faced to the second yoke as to defined the magnetic gap, a pair of permanent magnets are also interposed between the second and third yokes, and a permanent magnet is provide at the first yoke to apply a magnetic flux to the focusing coil.

REFERENCES:
patent: 4545046 (1985-10-01), Jansen et al.
patent: 4613962 (1986-09-01), Inoue et al.
patent: 4958336 (1990-09-01), Suzuki et al.
patent: 5007712 (1991-04-01), Kikuchi et al.
patent: 5073883 (1991-12-01), Mitsunori
"Development of high performance head positioner for an optical disk storage system", Tetsu Yamamoto, Takashi Yumura, Hiroo Shimegi; SPIE vol. 695, Optical Mass Data Storage II, 1986; pp. 153-159.
"Industrial Linear Motor", Chap. 2, Linear DC Motor, p. 37, Table 2.10 (Pen Recorder Indicating Meter For Linear DC Motor).

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