Patent EP0178077B1 successfully refreshed from Google Patents.
EP0178077B1
Expired / Lapsed
EP
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Optical head apparatus for recording and reproducing data on a recording medium
Assignee: Toshiba Corp
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Filing: 1985-09-10
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Granted: 1989-11-15
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Expires: 2005-09-10
Abstract
No abstract record available.
Inventors
- 👤 Akihiro C/O Patent Division Kasahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:06
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/0935; G11B7/0932
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
An optical head apparatus for recording and reproducing data by forming optical dots on a recording surface of recording medium, comprising: a base (50, 100), which is movably in a prescribed direction; a movably body (32, 118) movably provided in relation to said base; a lens (30, 124) which is attached to said movably body; a pair of magnets (36, 130a, 130b); and a pair of positioning adjustment coils (14, 16, 44, 46, 146a, 146b, 148a, 148b) which are wound such that planes including respective loops of the coils are perpendicular to the direction of magnetization of said magnets, characterized in that said pair of magnets are fixed to the side surfaces of said movably body, that said pair of positioning adjustment coils are attached to said base facing said pair of magnets for operating together with said magnets to move said movable body in a prescribed direction, that when currents flow through said coils, forces based on Fleming's left had rule act on said respective coils, and that the area of said position adjustment coil which faces said magnet is not more than one half of a total area of both said coils and openings surrounded by said coils.
Claim 2
Dependent Claim
200 words
An optical head apparatus for recording and reproducing data by forming optical dots on a recording surface of recording medium, comprising: a base (50, 100), which is movably in a prescribed direction; a movably body (32, 118) movably provided in relation to said base; a lens (30, 124) which is attached to said movably body; a pair of magnets (36, 130a, 130b); and a pair of positioning adjustment coils (14, 16, 44, 46, 146a, 146b, 148a, 148b) which are wound such that planes including respective loops of the coils are perpendicular to the direction of magnetization of said magnets, characterized in that said pair of magnets are fixed to the side surfaces of said movably body, that said pair of positioning adjustment coils are attached to said base facing said pair of magnets for operating together with said magnets to move said movable body in a prescribed direction, that when currents flow through said coils, forces based on Fleming's left had rule act on said respective coils, and that the area of said position adjustment coil which faces said magnet is not more than one half of a total area of both said coils and openings surrounded by said coils.
Claim 3
Dependent Claim
36 words
An optical head apparatus according to claim 1, characterized by further comprising support shaft means (116), which is implanted in said base, and has a bearing, for allowing said movable body to slide in said bearing.
Claim 4
Dependent Claim
35 words
An optical head apparatus according to claim 2, characterized in that the surface of said magnet (130a, 130b) facing said position adjustment coil (146a, 146b, 148a, 148b) is convex for preventing contact with said coil.
Claim 5
Dependent Claim
76 words
An optical head apparatus according to claim 2, characterized by further comprising a damper member (134) attached to said base (100) at at least one location, and attached to said movable body (118) at at least one other location, a first groove (128a, 128b) provided in the side surface of said movable body for attaching said magnet and a second groove (132a, 132b) provided at the bottom of said first groove for engaging said damper member.
Claim 6
Dependent Claim
34 words
An optical head apparatus according to claim 4, characterized in that said damper member has a portion (138a, 138b) of differing width and said second groove has a portion (136a, 136b) of differing width.
Claim 7
Dependent Claim
30 words
An optical head apparatus according to claim 4, characterized in that said damper member has a portion of differing thickness and said second groove has a portion of differing thickness.
Claim 8
Dependent Claim
30 words
An optical head apparatus according to claim 1, characterized in that said pair of position adjustment coils (146a, 146b, 148a, 148b) are fastened on a flexible printed circuit board (144).
Claim 9
Dependent Claim
36 words
An optical head apparatus according to claim 7, characterized in that hole means (150a, 150b) are provided in said printed circuit board (144) for attaching said coil in a prescribed position on said printed circuit board.
References Cited (Backward Citations)
EP0112595A1
Cited
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