US4462096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickup assembly for disc player
Assignee: Sony Corp
•
Filing: 1981-10-23
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Granted: 1984-07-24
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Expires: 2001-10-23
Abstract
Abstract A pickup assembly for a disc player includes a magnetic circuit for generating magnetic fluxes perpendicular to each other, a first coil group through which a current flows in a direction perpendicular to the magnetic fluxes, a second coil group through which a current flows in a direction perpendicular to one of the magnetic fluxes, a third coil group through which a current flows in a direction perpendicular to the other of the magnetic fluxes, a bobbin on which the first, second and third coil groups are wound, and a supporting member for supporting the bobbin so as to be movable in the three ways as along X-, Y- and Z axes.
Inventors
- 👤 Satoshi Kusaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/093
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
168 words
A pickup assembly for a disc player comprising: (A) a tube-like movable member having an optical system; (B) a first coil group wound on said movable member in the direction parallel to the axis of said movable member; (C) second and third coil groups arranged on said movable member, perpendicular to said first coil group in the space relationship of angle 90° to each other, said second and third coil groups each including a pair of adjoining coils, respectively; and (D) a magnetic circuit for supplying magnetic fluxes to said first, second and third coil groups, said magnetic circuit including magnetic poles being arranged in the space relationship of angle 90° to each other so as to face to said second and third coil groups respectively, and said movable member being axially and radially supported by spring means to align and bias the adjoining side portions of said paired coils of the second and third coil groups substantially with and toward the center of said magnetic poles respectively.
Claim 2
Dependent Claim
168 words
A pickup assembly for a disc player comprising: (A) a tube-like movable member having an optical system; (B) a first coil group wound on said movable member in the direction parallel to the axis of said movable member; (C) second and third coil groups arranged on said movable member, perpendicular to said first coil group in the space relationship of angle 90° to each other, said second and third coil groups each including a pair of adjoining coils, respectively; and (D) a magnetic circuit for supplying magnetic fluxes to said first, second and third coil groups, said magnetic circuit including magnetic poles being arranged in the space relationship of angle 90° to each other so as to face to said second and third coil groups respectively, and said movable member being axially and radially supported by spring means to align and bias the adjoining side portions of said paired coils of the second and third coil groups substantially with and toward the center of said magnetic poles respectively.
Claim 3
Dependent Claim
58 words
A pickup assembly for a disc player according to claim 1, in which said second coil group is symmetrically arranged with respect to the axis of said movable member, and said third coil group is symmetrically arranged in the space relationship of angle 90° to said second coil group with respect to the axis of said movable member.
Claim 4
Dependent Claim
70 words
A pickup assembly for a disc player according to claim 1, in which said magnetic circuit includes a first hollow yoke arranged within said movable member and a second yoke having permanent magnets, said second yoke being magnetically integral with said first yoke and said permanent magnets facing to said first, second and third coil group, and said spring means is arranged between said magnetic circuit and said movable member.
Claim 5
Dependent Claim
74 words
A pickup assembly for a disc player according to claim 3, in which said spring means includes a first leaf spring having plural arms, arranged between one end of said movable member and said magnetic circuit, and a second leaf spring having plural arms, arranged between another end of said movable member and said magnetic circuit, said arms of the first leaf spring being angularly shifted from said arms of the second leaf spring.
Claim 6
Dependent Claim
47 words
A pickup assembly for a disc player according to claim 3, in which said second yoke includes four magnetic pole members formed integrally with said first yoke and in the axis direction of said movable member, said permanent magnets being attached to said magnetic pole elements, respectively.
Claim 7
Dependent Claim
26 words
A pickup assembly for a disc player according to claim 5, in which auxiliary tapered yokes are attached to the surfaces of said permanent magnets, respectively.
Claim 8
Dependent Claim
29 words
A pickup assembly for a disc player according to claim 1, in which said spring means comprises a foaming urethane arranged between said movable member and said magnetic circuit.
Claim 9
Dependent Claim
52 words
A pickup assembly for a disc player according to claim 1, in which said magnetic circuit includes a first yoke having a central hollow, a ringular permanent magnet coupled magnetically with said first yoke, and a second yoke having magnetic pole elements which face to said first, second and third coil groups.
Claim 10
Dependent Claim
75 words
A pickup assembly for a disc player according to claim 1, in which said first coil group includes a first coil part for driving said movable member in its axis direction, a second coil part for detecting the axial movement of said movable member, and generating detecting output, and means for feeding back said detecting output of the second coil part to said first coil part to prevent any undesirable movement of said movable member.
Claim 11
Dependent Claim
91 words
A pickup assembly for a disc player according to claim 1, in which a current flowing through one of said paired coils of the second coil group functions to drive said movable member in the first direction normal to the axis of said movable member, and the other of said paired coils of the second coil generates an electrical signal in response to the movement of said movable member in said first direction, said electrical signal being supplied to prevent the undesirable movement of said movable member in said first direction.
Claim 12
Dependent Claim
91 words
A pickup assembly for a disc player according to claim 1, in which a current flowing through one of said paired coils of the third coil group functions to drive said movable member in the second direction normal to the axis of said movable member, and the other of said paired coils of the third coil generates an electrical signal in response to the movement of said movable member in said second direction, said electrical signal being supplied to prevent the undesirable movement of said movable member in said second direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |