Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-04-14
1984-10-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 44, 350247, G05B 100
Patent
active
044790511
ABSTRACT:
An apparatus for driving an objective lens which projects a light spot onto an information track or tracks recorded spirally or concentrically on a disc-shaped record medium to read out information, in order to correct a tracking error, comprises a pair of leaf springs for supporting the objective lens movably in a tracking direction perpendicular to the optical axis of objective lens as well as to the track direction, a movable member made of magnetic material and being coupled with the movable member to move in the tracking direction in conjunction with the objective lens, first and second magnetic members made of magnetic material and arranged in such a manner that the movable member is interposed between the first and second magnetic members at their one end portions via gaps, a third magnetic member made of magnetic material for coupling the first and second magnetic members at their other end portions, first and second coils wound on the one end portions of the first and second magnetic members, respectively, and magnetic flux producing means such as a permanent magnet and an electromagnet for producing a constant magnetic flux through the first, second and third magnetic members and the movable member. The gaps may be filled with magnetic fluids.
REFERENCES:
patent: 4123147 (1978-10-01), Hill et al.
patent: 4144542 (1979-03-01), Preuss
patent: 4193091 (1980-03-01), Kleuters et al.
Nelms David C.
Olympus Optical Co,. Ltd.
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