US4472024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for driving objective lens
Assignee: Olympus Corp
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Filing: 1982-01-07
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Granted: 1984-09-18
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Expires: 2002-01-07
Abstract
Abstract In an apparatus for driving an objective lens which projects a light spot onto an information track recorded spirally or concentrically on a disc-shaped record medium to read out information, a lens holder for holding the objective lens is supported by an intermediate cylindrical member by means of a pair of upright leaf springs movably in a tracking direction, the intermediate cylindrical member is then supported by an outer fixed cylindrical member via a pair of spiral leaf springs movably in a focussing direction parallel to an optical axis of the objective lens, dampers made of elastic material are secured to the upright leaf springs and the spiral leaf springs so as to suppress resonance caused by the leaf springs. Therefore, precise focussing and tracing controls can be carried out without being affected by the undesired resonance of the leaf springs.
Inventors
- 👤 Yutaka Konomura
- 👤 Takashi Hamaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/373; G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/0932
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
185 words
An apparatus for driving an objective lens in its optical axis direction for effecting a focussing control comprising: a cylindrical frame; means for holding the objective lens; a plurality of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to the objective lens holding means and each sprial leaf spring having a plurality of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion; means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; and a plurality of damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.
Claim 2
Independent Claim
185 words
An apparatus for driving an objective lens in its optical axis direction for effecting a focussing control comprising: a cylindrical frame; means for holding the objective lens; a plurality of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to the objective lens holding means and each sprial leaf spring having a plurality of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion; means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; and a plurality of damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.
Claim 3
Dependent Claim
48 words
The apparatus of claim 1, wherein said damping members comprise elastic disc-shaped annular damper sheets, a surface adjacent to an inside diameter of one disc-shaped annular sheet is secured to a parallel surface on one spiral leaf spring adjacent the annular root portion of the spiral leaf spring.
Claim 4
Dependent Claim
51 words
The apparatus of claim 1, wherein said damping members comprise a plurality of elastic damper chips, each chip having a first end portion and a second end portion, said first end portion is secured to a first arcuate arm and said second end portion is secured to a second arcuate arm.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3, wherein said first arcuate arm and said second arcuate arm are circumferentially, consecutively located.
Claim 6
Dependent Claim
31 words
The apparatus of claim 3, wherein surfaces adjacent to said first and second end portions are respectively secured to parallel surfaces on said first arcuate arm and said second arcuate arm.
Claim 7
Dependent Claim
12 words
The apparatus of claim 1, wherein there are two spiral leaf springs.
Claim 8
Dependent Claim
11 words
The apparatus of claim 1, wherein there are two damping members.
Claim 9
Dependent Claim
14 words
The apparatus of claim 2, wherein there are two elastic disc-shaped annular damper sheets.
Claim 10
Dependent Claim
24 words
The apparatus of claim 1, wherein said second end of each arcuate arm is circumferentially wider than said first end of each arcuate arm.
Claim 11
Dependent Claim
126 words
The apparatus of claim 1, wherein said objective lens holding means comprises an annular lens holder, an intermediate cylindrical body secured to the spiral leaf springs adjacent said annular root portions on the spiral leaf springs, a plurality of elongated leaf springs having a first end portion secured to said intermediate cylindrical body and a second end portion secured to the annular lens holder, the plurality of elongated leaf springs extending in a substantially parallel relationship with the optical axis of the objective lens, means for driving the objective lens in a direction perpendicular to said optical axis, thereby providing for a tracking control, and a plurality of second damping members, each damping member is provided adjacent said first end portion of each elongated leaf spring.
Claim 12
Dependent Claim
28 words
The apparatus of claim 10, wherein each of said second damping members comprises an elastic damper block positioned between each elongated leaf spring and the intermediate cylindrical body.
Claim 13
Dependent Claim
32 words
The apparatus of claim 11, wherein the elastic damper block is adhered to at least one surface of each elongated leaf spring near said first end portion of each elongated leaf spring.
Claim 14
Dependent Claim
31 words
The apparatus of claim 10, wherein each of said second damping members comprises an elastic filling filled into a space created between each elongated leaf spring and the intermediate cylindrical body.
Claim 15
Dependent Claim
24 words
The apparatus of claim 13, wherein the elastic filling is filled into a space near said first end portion of each elongated leaf spring.
Claim 16
Dependent Claim
28 words
The apparatus of claim 10, wherein each of said second damping members comprises a sheet-like elastic chip adhered to at least one surface of each elongated leaf spring.
Claim 17
Dependent Claim
32 words
The apparatus of claim 15, wherein the sheet-like elastic chip is adhered to at least one surface of each elongated leaf spring near said first end portion of each elongated leaf spring.
Claim 18
Dependent Claim
12 words
The apparatus of claim 10, wherein there are two spiral leaf springs.
Claim 19
Dependent Claim
12 words
The apparatus of claim 10, wherein there are two elongated leaf springs.
Claim 20
Independent Claim
185 words
An apparatus for driving an objective lens in its optical axis direction for effecting a focussing control comprising: a cylindrical frame; means for holding the objective lens; a pair of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to the objective lens holding means and each spiral leaf spring having a pair of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion; means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; and a pair of damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.
Claim 21
Independent Claim
185 words
An apparatus for driving an objective lens in its optical axis direction for effecting a focussing control comprising: a cylindrical frame; means for holding the objective lens; a pair of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to the objective lens holding means and each spiral leaf spring having a pair of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion; means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; and a pair of damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.
Claim 22
Independent Claim
326 words
An apparatus for driving an objective lens in its optical axis direction and in a direction perpendicular to its optical axis direction for effecting a focussing control and a tracking control comprising: a cylindrical frame; means for holding the objective lens comprising an annular lens holder, an intermediate cylindrical body, a plurality of elongated leaf springs having a first end portion secured to said intermediate cylindrical body and a second end portion secured to the annular lens holder, the plurality of elongated leaf springs extending in a substantially parallel relationship with the optical axis of the objective lens, means for driving the objective lens in a direction perpendicular to said optical axis, thereby providing for a tracking control, and a plurality of first damping members, each damping member is provided adjacent said first end portion of each elongated leaf spring; a plurality of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to said intermediate cylindrical body and each spiral leaf spring having a plurality of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion; means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; means for driving the objective lens in a direction perpendicular to the optical axis direction in accordance with a tracking control signal, thereby correcting any tracking error; and a plurality of second damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said second damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.
Claim 23
Independent Claim
326 words
An apparatus for driving an objective lens in its optical axis direction and in a direction perpendicular to its optical axis direction for effecting a focussing control and a tracking control comprising: a cylindrical frame; means for holding the objective lens comprising an annular lens holder, an intermediate cylindrical body, a plurality of elongated leaf springs having a first end portion secured to said intermediate cylindrical body and a second end portion secured to the annular lens holder, the plurality of elongated leaf springs extending in a substantially parallel relationship with the optical axis of the objective lens, means for driving the objective lens in a direction perpendicular to said optical axis, thereby providing for a tracking control, and a plurality of first damping members, each damping member is provided adjacent said first end portion of each elongated leaf spring; a plurality of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to said intermediate cylindrical body and each spiral leaf spring having a plurality of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion; means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; means for driving the objective lens in a direction perpendicular to the optical axis direction in accordance with a tracking control signal, thereby correcting any tracking error; and a plurality of second damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said second damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.
Claim 24
Dependent Claim
12 words
The apparatus of claim 20, wherein there are two spiral leaf springs.
Claim 25
Dependent Claim
20 words
The apparatus of claim 20, wherein the plurality of said second damping members comprise two elastic disc-shaped annular damper sheets.
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |