Registers – Coded record sensors – Particular sensor structure
Patent
1988-12-21
1991-10-01
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235476, 235486, 369 13, G06K 710, G06K 701
Patent
active
050536117
ABSTRACT:
A recording and reproducing device for a magneto-optical card includes an optical head for irradiating a magneto-optical recording medium of a magneto-optical card placed into the device with a laser beam. A magnetic field generator applies a biased magnetic field to the magneto-optical recording medium, and an optical system manipulating mechanism for the optical system of the above-mentioned optical head varies the spot irradiated by the laser beam. The optical head is fixed to the main frame of the device. The magneto-optical card is also supported where it is irradiated by the laser beam emitted from the optical head. The magneto-optical card is moved in a plane parallel to the surface of the magneto-optical card for rough searching and then a part of or the whole magnetic field generator is moved to come into contact with the magneto-optical card to stop the vibration of the magneto-optical card. The spot to be irradiated by the laser beam is then varied by means of the optical system of the optical head.
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Katayama Hiroyuki
Mieda Michinobu
Murakami Yoshiteru
Nakayama Junichiro
Ohta Kenji
Levy Stuart S.
Sharp Kabushiki Kaisha
Weinhardt Robert
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