Patent US4687296A successfully refreshed from Google Patents.
US4687296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical pickup
Assignee: Sony Corp
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Filing: 1985-08-22
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Granted: 1987-08-18
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Expires: 2005-08-22
Abstract
Abstract An optical pickup of the invention has an objective lens holder holding an objective lens, a support shaft which supports the objective lens holder such that the holder is slidable along the axial direction and pivotable about its axis, and a press member for pressing the objective lens holder against the support shaft.
Inventors
- 👤 Yasunori Terayama
- 👤 Masashi Nakamura
- 👤 Kazuhiko Fujiie
- 👤 You Yoshitoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:14
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/0933; G11B7/0932
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
An optical pickup comprising an objective lens holder, an objective lens received within said holder, a base, a support shaft secured to said base and supporting said objective lens holder such that said objective lens holder is slidable along an axial direction and pivotable about an axis thereof, a press member composed of an elastic material interposed between said objective lens holder and said base, said press member being compressed between said objective lens holder and said base such that said objective lens holder is urged in a direction perpendicular to said support shaft.
Claim 2
Dependent Claim
94 words
An optical pickup comprising an objective lens holder, an objective lens received within said holder, a base, a support shaft secured to said base and supporting said objective lens holder such that said objective lens holder is slidable along an axial direction and pivotable about an axis thereof, a press member composed of an elastic material interposed between said objective lens holder and said base, said press member being compressed between said objective lens holder and said base such that said objective lens holder is urged in a direction perpendicular to said support shaft.
Claim 3
Dependent Claim
91 words
An optical pickup comprising an objective lens holder, an objective lens received within said holder, a base, a support shaft secured to said base and supporting said objective lens holder such that said objective lens holder is slidable along an axial direction and pivotable about an axis thereof, a press member comprising a magnetic member fixed to said objective lens holder and a magnet oriented to repel said magnetic member, said objective lens holder being biased in a direction perpendicular to said support shaft by the the force of said magnet.
Claim 4
Dependent Claim
91 words
An optical pickup comprising an objective lens holder, an objective lens received within said holder, a base, a support shaft secured to said base and supporting said objective lens holder such that said objective lens holder is slidable along an axial direction and pivotable about an axis thereof, a press member comprising a magnetic member fixed to said objective lens holder and a magnet oriented to repel said magnetic member, said objective lens holder being biased in a direction perpendicular to said support shaft by the the force of said magnet.
Claim 5
Dependent Claim
21 words
An optical pickup according to claim 2, wherein said magnetic member comprises a plate member made of an amorphous magnetic material.
Claim 6
Dependent Claim
27 words
An optical pickup according to claim 2, wherein said magnetic member comprises a plate member which consists of a non-magnetic material and coated with a magnetic paint.
Claim 7
Dependent Claim
26 words
An optical pickup according to any one of claims 1 or 2, wherein the urging or biasing direction is a direction perpendicular to a tracking 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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |