Patent
External magnetic field application device including a heat dissipation member and a metal plate for dissipating heat
Masahiko Chaya,Toru Takahashi +1 more
TLDR
In this paper, an external magnetic field application device for use in an optical information recording and reproducing apparatus is described, which 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.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.read more
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Patent
Servo control system for information storage device
Randolph Scott Crupper,Marvin Benjamin Davis,Kurt Walter Getreuer,Grassens Leonardus J,David Earl Lewis,David Louis Schell +5 more
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Randolph Scott Crupper,Marvin Benjamin Davis,Kurt Walter Getreuer,Grassens Leonardus J,David Earl Lewis,David Louis Schell +5 more
TL;DR: In this paper, an optical drive system includes an optical assembly, an objective lens positioned to direct light between the optical assembly and a respective information storage medium, and an actuator suspending the objective lens for relative motion thereof with respect to the actuator.
Patent
Laser driver for controlling electrical current passed to a laser in an optical disc system
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References
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Patent
Device for producing a high frequency modulation magnetic field used in magneto-optical recording
TL;DR: In this article, a device for producing a high frequency modulating magnetic field is disclosed. The device is especially useful to achieve real-time overwriting in magneto-optical re-cording.
Patent
Photomagnetic recording and reproducing device
TL;DR: In this paper, the authors proposed to increase vertical components in a magnetic field and to reduce the variation of the magnetic field due to a distance by constituting the titled device so that an outside york is arranged so as to surround an exciting coil in a center york adjacently to the tip of the center York.
Patent
Magnetic field impressing device for magneto-optical recording device
TL;DR: In this paper, the authors proposed to fill a material with a high coefficient of thermal conductivity in the gap between the conductive coil of a magnetic field generating element and a yoke.
Patent
Impact type dot head
Hasumi Hitoshi,Hirano Hirofumi +1 more
TL;DR: In this article, an impact type dot head with short wires was used to obtain an accuracy enhanced by using short wires and capable of reducing power consumption, by arranging wires in parallel.