US5200940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical unit actuator for information recording/reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1991-02-13
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Granted: 1993-04-06
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Expires: 2011-02-13
Abstract
Abstract An optical unit actuator for an optical information recording/reproducing apparatus includes an electromagnetic drive mechanism composed of a coil and a magnet cooperative to drive an objective lens mounted on an optical unit. One of the coil and the magnet is secured to the optical unit. The other of the coil and the magnet is held on a fixed unit with an elastic support member disposed therebetween, the fixed unit being immovable as against the movable optical unit. The elastic support member substantially dampens or takes up vibration caused by a reaction force creased as a result of acceleration of the objective lens when the objective lens is driven to follow a dynamic radial runout and an axial deflection of an optical disk. With the elastic support member thus provided, an optical component, a photo-electric transducer or the optical disk which is disposed on the side of the fixed unit is isolated from vibration. The control characteristics of a system including an optical head, the optical disk and a control circuit for the optical head can, therefore, be improved.
Inventors
- 👤 Shoji Goto
- 👤 Ichiro Kawamura
- 👤 Hiroshi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:01
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/085; G11B7/0857; G11B7/08582
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
An optical unit actuator for an information recording/reproducing apparatus, comprising: an optical unit including an objective lens and displaceable in a predetermined direction relative to a recording medium; a fixed unit immovable as against the displacement of said optical unit, said fixed unit including a magnetic circuit; an electromagnetic drive mechanism including at least one coil and a magnet cooperative with said coil to drive said optical unit in said predetermined direction relative to said recording medium, one of said coil and said magnet being fixed to said optical unit, the other of said coil and said magnet being held on said fixed unit in confronting relation to said one of said coil and said magnet so as to form a part of said magnetic circuit; and an elastic support means disposed between said other of said coil and said magnet and said fixed unit for substantially taking up vibration caused by a reaction force produced between said coil and said magnet as a result of acceleration produced when said optical unit including an objective lens moves in said predetermined direction relative to said recording medium.
Claim 2
Dependent Claim
186 words
An optical unit actuator for an information recording/reproducing apparatus, comprising: an optical unit including an objective lens and displaceable in a predetermined direction relative to a recording medium; a fixed unit immovable as against the displacement of said optical unit, said fixed unit including a magnetic circuit; an electromagnetic drive mechanism including at least one coil and a magnet cooperative with said coil to drive said optical unit in said predetermined direction relative to said recording medium, one of said coil and said magnet being fixed to said optical unit, the other of said coil and said magnet being held on said fixed unit in confronting relation to said one of said coil and said magnet so as to form a part of said magnetic circuit; and an elastic support means disposed between said other of said coil and said magnet and said fixed unit for substantially taking up vibration caused by a reaction force produced between said coil and said magnet as a result of acceleration produced when said optical unit including an objective lens moves in said predetermined direction relative to said recording medium.
Claim 3
Dependent Claim
53 words
An optical unit actuator according to claim 1, wherein said optical unit includes an objective lens holder to which said coil is secured, said magnetic circuit including an elongate back yoke along which said optical unit is movable, said magnet being held on said back yoke with said elastic support means disposed therebetween.
Claim 4
Dependent Claim
64 words
An optical unit actuator according to claim 1, wherein said optical unit includes an objective lens holder to which said objective lens is secured, said fixed unit including an actuator base on which said objective lens holder is movably mounted, said coil being secured to said objective lens holder, said magnet being supported on said actuator base with said elastic support means disposed therebetween.
Claim 5
Dependent Claim
71 words
An optical unit actuator according to claim 3, wherein said optical unit further includes an optical base on which said actuator base is fixedly mounted, said fixed unit including a drive base on which said optical base is movably supported, said electromagnetic drive mechanism further including a second coil secured to said optical base, and a second magnet held on said drive base with a second elastic support means disposed therebetween.
Claim 6
Dependent Claim
17 words
An optical unit actuator according to claim 1, wherein said elastic support means is made of rubber.
Claim 7
Dependent Claim
190 words
An optical unit actuator for an information recording/reproducing apparatus, comprising: an optical unit including an objective lens and displaceable in a predetermined direction relative to a recording medium; a fixed unit immovable as against the displacement of said optical unit; an electromagnetic drive mechanism including at least one coil and a magnet cooperative with said coil to drive said optical unit in said predetermined direction relative to said recording medium; and one of said coil and said magnet being fixed to said optical unit, the other of said coil and said magnet being held on said fixed unit with an elastic support means disposed therebetween, wherein: said optical unit includes an objective lens holder to which said coil is secured, said fixed unit including a magnetic circuit having an elongate back yoke along which said optical unit is movable, said magnet being held on said back yoke with said elastic support means disposed therebetween, and further includes a carriage movably supporting thereon said objective lens holder and slidably movable in the longitudinal direction of said back yoke, said electromagnetic drive mechanism further including a second coil secured to said carriage.
Claim 8
Dependent Claim
190 words
An optical unit actuator for an information recording/reproducing apparatus, comprising: an optical unit including an objective lens and displaceable in a predetermined direction relative to a recording medium; a fixed unit immovable as against the displacement of said optical unit; an electromagnetic drive mechanism including at least one coil and a magnet cooperative with said coil to drive said optical unit in said predetermined direction relative to said recording medium; and one of said coil and said magnet being fixed to said optical unit, the other of said coil and said magnet being held on said fixed unit with an elastic support means disposed therebetween, wherein: said optical unit includes an objective lens holder to which said coil is secured, said fixed unit including a magnetic circuit having an elongate back yoke along which said optical unit is movable, said magnet being held on said back yoke with said elastic support means disposed therebetween, and further includes a carriage movably supporting thereon said objective lens holder and slidably movable in the longitudinal direction of said back yoke, said electromagnetic drive mechanism further including a second coil secured to said carriage.
References Cited (Backward Citations)
US4367543A
Cited
JPS59124043A
Cited
US4613202A
Cited
EP0178719A1
Cited
US4960321A
Cited
US5046821A
Cited
US5070489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |