EP0419097A2
Expired / Lapsed
EP
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Objective lens driving devices
Assignee: Sony Corp
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Filing: 1990-09-07
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Granted: —
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Expires: 2010-09-07
Abstract
Abstract An objective lens driving device for an optical pick-up comprises a supporting member (12) to which an objective lens (11) is attached, the supporting member (12) being freely translated in the direction parallel to the optical axis direction of the objective lens (11) and in the plane direction perpendicular to the optical axis direction, a stationary portion (14) to which the supporting member (12) is attached, a magnetic circuit (15) provided on the supporting member (12) to form a closed magnetic path, a focusing coil (20) for driving the objective lens (11) in cooperation with the magnetic circuit (15) so that the objective lens (11) is translated parallel to the optical axis direction of the objective lens (11) and perpendicular to the optical axis direction and a plurality of tracking coils (21) attached to the focusing coil (20), wherein the focusing coil (20) and the tracking coils (21) are mounted on the stationary portion (14) so as to oppose the magnetic circuit (15) with a predetermined spacing therebetween.
Inventors
- 👤 Hidehiro C/O Patents Division Kume
- 👤 Koji C/O Patents Division Mitsumori
- 👤 Tomoyuki C/O Patents Division Ishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:32
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/12; G11B7/0925; G11B7/0932; G11B7/0933; G11B7/0935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
An objective lens driving device comprising: supporting means (12) having an objective lens (11) attached thereto and being supported such that said supporting means (12) can be translated parallel to the optical axis direction of said objective lens (11) and perpendicular to said optical axis direction; a magnetic circuit (15) provided on said supporting means (12) to form a closed magnetic path; a focusing coil (20) for moving said objective lens (11) parallel to said optical axis direction in cooperation with said magnetic circuit (15); and a tracking coil (21) for moving said objective lens (11) perpendicular to said optical axis direction in cooperation with said magnetic circuit (15); wherein said focusing coil (20) and said tracking coil (21) are opposed to each other with a predetermined spacing relative to said magnetic circuit (15).
Claim 2
Dependent Claim
134 words
An objective lens driving device comprising: supporting means (12) having an objective lens (11) attached thereto and being supported such that said supporting means (12) can be translated parallel to the optical axis direction of said objective lens (11) and perpendicular to said optical axis direction; a magnetic circuit (15) provided on said supporting means (12) to form a closed magnetic path; a focusing coil (20) for moving said objective lens (11) parallel to said optical axis direction in cooperation with said magnetic circuit (15); and a tracking coil (21) for moving said objective lens (11) perpendicular to said optical axis direction in cooperation with said magnetic circuit (15); wherein said focusing coil (20) and said tracking coil (21) are opposed to each other with a predetermined spacing relative to said magnetic circuit (15).
Claim 3
Dependent Claim
37 words
A device according to claim 1 further comprising a stationary portion (14) on which said supporting means (12) is mounted, wherein said focusing coil (20) and said tracking coil (21) are mounted on said stationary portion (14).
Claim 4
Dependent Claim
31 words
A device according to claim 2 wherein said stationary portion (25) has formed thereon a wiring pattern (26) for supplying a drive current to said focusing and tracking coils (20, 21).
Claim 5
Dependent Claim
55 words
A device as cited in claim 1 wherein said magnetic circuit (15) comprises a yoke (16) formed of a pair of plane portions opposed to each other and a coupling portion for connecting said pair of plane portions and a magnetic piece (17) provided in any one of said plane portions of said yoke (16).
Claim 6
Dependent Claim
49 words
A device according to claim 4 wherein said magnetic circuit (15) has return magnetic paths for said yoke (26a, 26b) and said return magnetic paths are asymmetrical with respect to a straight line passing through the centre of gravity of a movable portion of said objective lens drive device.
Claim 7
Dependent Claim
25 words
A device according to claim 5 wherein said coupling portion of said yoke (26a, 26b) couples said plane portions at portions displaced to the rearward.
Claim 8
Dependent Claim
23 words
A device according to claim 1 wherein said magnetic circuit (15) is provided at substantially the central portion of said supporting means (12).
Claim 9
Dependent Claim
24 words
A device according to claim 7 wherein said magnetic circuit (15) is provided at the centre of gravity portion of said supporting means (12).
Claim 10
Dependent Claim
61 words
A device according to claim 8 wherein said magnetic circuit comprises a yoke (36) formed of first and second plane portions, a third plane portion opposed to said first and second plane portions with a predetermined spacing and a coupling portion for coupling said first, second and third plane portions and a magnetic piece (37) attached to said third plane portion.
Claim 11
Dependent Claim
27 words
A device according to claim 9 wherein said first and second plane portions of said yoke (36) are provided so as to oppose said tracking coil (41).
Claim 12
Dependent Claim
76 words
A device according to claim 1 wherein said magnetic circuit comprises a pair of yokes (46) formed of a pair of plane portions opposed to each other across said coil and a first coupling portion for coupling said first and second plane portions at their one ends, a second coupling portion for coupling said pair of yokes at their other ends and a magnet piece attached to any one of said plane portions of said yokes.
Claim 13
Dependent Claim
16 words
A device according to claim 11 wherein said second coupling portion has formed therethrough an opening.
References Cited (Backward Citations)
No citation records indexed.
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