Patent US5285040A successfully refreshed from Google Patents.
Patent EP0212941A2 successfully refreshed from Google Patents.
EP0212941A2
Expired / Lapsed
EP
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Optical pick-up devices
Assignee: Sony Corp
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Filing: 1986-08-13
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Granted: —
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Expires: 2006-08-13
Abstract
Abstract An optical pick-up device (1) comprising an objective lens (23) having an optical axis for focusing a light beam emitted from a light source onto an optical recording medium. The objective lens (23) is carried on a support member (19) which is coupled with a base (2) through a coupling unit (10). The coupling unit (10) has a first rotation axis parallel to the optical axis for permitting rotation of the support member (19) about the first rotation axis in a tracking direction perpendicular to the optical axis and a second rotation axis perpendicular to the optical axis for permitting rotation of the support member (19) about the second rotation axis in a focusing direction parallel to the optical axis. The support member (19) has a centre of gravity positioned substantially on the first rotation axis. A light beam reflected from the optical recording medium is sensed for deriving a force to be exerted on the support member (19) to move the objective lens (23) in the focusing and/or tracking directions so as to adjust the optical axis to a desired position.
Inventors
- 👤 Hiroshi Patents Division Oinoue
- 👤 Yoshimasa Patents Division Goda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:16
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/0932; G11B7/093
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
211 words
An optical pick-up device (1) comprising a base (2), an objective lens (23) having an optical axis for focusing a light beam emitted from a light source onto an optical recording medium, a support member (19) carrying said objective lens (23) thereon, a coupling unit (10) coupling said support member (19) to said base (2) for permitting movement of said support member (19), and means (30, 31) responsive to a light beam reflected from said optical recording medium for exerting a force on said support member (19) to move said objective lens (23); characterised in that: said coupling unit (10) has a first rotation axis parallel to said optical axis for permitting rotation of said support member (19) about said first rotation axis in a tracking direction perpendicular to said optical axis, said coupling unit (10) having a second rotation axis perpendicular to said optical axis for permitting rotation of said support member (19) about said second rotation axis in a focusing direction parallel to said optical axis; said support member (19) has a centre of gravity positioned substantially on said first rotation axis; and said means (30, 31) moves said objective lens (23) in the focusing and/or tracking direction so as to adjust said optical axis to a desired position.
Claim 2
Dependent Claim
211 words
An optical pick-up device (1) comprising a base (2), an objective lens (23) having an optical axis for focusing a light beam emitted from a light source onto an optical recording medium, a support member (19) carrying said objective lens (23) thereon, a coupling unit (10) coupling said support member (19) to said base (2) for permitting movement of said support member (19), and means (30, 31) responsive to a light beam reflected from said optical recording medium for exerting a force on said support member (19) to move said objective lens (23); characterised in that: said coupling unit (10) has a first rotation axis parallel to said optical axis for permitting rotation of said support member (19) about said first rotation axis in a tracking direction perpendicular to said optical axis, said coupling unit (10) having a second rotation axis perpendicular to said optical axis for permitting rotation of said support member (19) about said second rotation axis in a focusing direction parallel to said optical axis; said support member (19) has a centre of gravity positioned substantially on said first rotation axis; and said means (30, 31) moves said objective lens (23) in the focusing and/or tracking direction so as to adjust said optical axis to a desired position.
Claim 3
Dependent Claim
76 words
An optical pick-up device (1) according to claim 1 wherein said coupling unit (10) includes a mounting base (11) secured on said base (2), a hinge member (15) secured on said support member (19) for permitting rotation of said support member (19) about said first rotation axis, and a parallel link (13) coupled between said mounting base (11) and said hinge member (15) for permitting rotation of said support member (19) about said second rotation axis.
Claim 4
Dependent Claim
35 words
An optical pick-up device (1) according to claim 2 wherein at least one weight (25, 26) is mounted on said support member (19) for positioning said centre of gravity substantially on said first rotation axis.
Claim 5
Dependent Claim
30 words
An optical pick-up device (1) according to claim 2 wherein said mounting base (11), said hinge member (15) and said parallel link (13) are made integrally of a synthetic resin.
Claim 6
Dependent Claim
34 words
An optical pick-up device (1) according to claim 2 wherein said parallel link (13) comprises a pair of resilient plates placed in parallel-spaced relation between said mounting base (11) and said hinge member (15).
Claim 7
Dependent Claim
79 words
An optical pick-up device (1) according to claim 1 wherein said coupling unit (10) includes a mounting base (36) secured on said base (2), a hinge member (15) secured on said mounting base (36), and a parallel link (39) coupled between said hinge member (15) and said support member (19) for permitting rotation of said support member (19) about said second rotation axis, said hinge member (15) permitting rotation of said support member (19) about said first rotation axis.
Claim 8
Dependent Claim
34 words
An optical pick-up device according to claim 6 wherein at least one weight (25, 38) is mounted on said support member (37) for positioning said centre of gravity substantially on said first rotation axis.
Claim 9
Dependent Claim
33 words
An optical pick-up device according to claim 6 wherein said parallel link (39) comprises a pair of resilient plates placed in parallel-spaced relation between said hinge member (15) and said support member (37).
References Cited (Backward Citations)
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