Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1991-01-23
1993-05-18
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4414, 359824, G11B 712
Patent
active
052126730
ABSTRACT:
An optical disk drive unit has an objective lens for converging light emitted from a light source and irradiating the converged light to an optical information recording medium; an objective lens holder for holding the objective lens; a carriage for supporting elastically the objective lens holder thereto; and a magnetic circuit for performing a seeking operation and having a magnet and a yoke arranged outside the carriage and extending along a radial direction of the optical information recording medium, the magnetic circuit having a movable coil fixed to the carriage so as to surround one side of the yoke. The movable coil is formed in a polygonal shape in cross section and is constructed such that one carriage side of the movable coil is located below a moving part of the objective lens and another side of the movable coil opposite to the one carriage side thereof is set to be longer than the one carriage side. The movable coil may be wound around the one side of the yoke and a guide member movable in the radial direction of the optical information recording medium. A shorter side of the movable coil may be located below the moving part of the objective lens and no constructional portion may be located above a longer side of the movable coil.
REFERENCES:
patent: 4607913 (1986-08-01), Jansen
patent: 5023861 (1991-06-01), Champagne et al.
patent: 5128806 (1992-07-01), Ohno
Edun Mohammad
Psitos Aristotelis
Ricoh & Company, Ltd.
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