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US5737302A
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Galvanomirror and optical disk drive using the same
Assignee: Toshiba Corp
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Filing: 1995-11-09
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Granted: 1998-04-07
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Expires: 2015-11-09
Abstract
Abstract A galvanomirror includes a rocking member provided with a reflector. The rocking member is constituted of a semiconductor such as silicon, and connected to a hollow portion of a first plate through two elastic members. Second and third plates are insulatively bonded onto both sides of the first plate. Four electrodes are symmetrically provided on those portions of the second and third plates that correspond to the rocking member. In this constitution, if the rocking member is charged positively (negatively), the electrodes are charged negatively (positively), and the electrodes are charged positively (negatively), the rocking member is rotated (rocked) while the elastic members are twistedly deformed.
Inventors
- 👤 Akihiro Kasahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1362; G11B7/08; G11B7/085; G02; G02B; G02B26/00; G02B26/08; G02B26/0816; G02B26/0833; G02B26/0841; G02B7/00; G02B7/18; G02B7/182; G02B7/1821; G11B7/08547; G11B7/08564; G11B7/09; G11B7/0901; G11B7/0903; G11B7/094
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
An optical disk drive comprising: an objective lens for focusing a laser beam on an optical disk an optical head supporting said objective lens and movable along a surface of the optical disk; a galvanomirror, connected to said optical head, driven by electrostatic force, and disposed to reflect the laser beam; a magnet, operatively coupled to said objective lens and producing a magnetic field; and a coil, disposed to interact with the magnetic field of said magnet, and producing electromagnetic force to move said objective lens.
Claim 2
Dependent Claim
86 words
An optical disk drive comprising: an objective lens for focusing a laser beam on an optical disk an optical head supporting said objective lens and movable along a surface of the optical disk; a galvanomirror, connected to said optical head, driven by electrostatic force, and disposed to reflect the laser beam; a magnet, operatively coupled to said objective lens and producing a magnetic field; and a coil, disposed to interact with the magnetic field of said magnet, and producing electromagnetic force to move said objective lens.
Claim 3
Dependent Claim
55 words
The drive according to claim 1, wherein said galvanomirror comprises: a chargeable rocking member with a reflector; a supporting member for supporting said rocking member to allow said rocking member to be rocked; and a chargeable electrode for moving said rocking member by electrostatic force such that said reflector reflects light at a desired angle.
Claim 4
Dependent Claim
20 words
The drive according to claim 2, wherein: said reflector of said rocking member is formed by mirror-finishing said rocking member.
Claim 5
Dependent Claim
15 words
The drive according to claim 3, wherein: said rocking member is formed of semiconductor material.
Claim 6
Dependent Claim
12 words
The drive according to claim 4, wherein: said semiconductor material includes silicon.
Claim 7
Dependent Claim
17 words
The drive according to claim 3, wherein: said rocking member includes material having an anisotropic crystal structure.
Claim 8
Dependent Claim
23 words
The drive according to claim 2 wherein: said rocking member and said supporting member are formed integrally as one component by same material.
Claim 9
Dependent Claim
19 words
The drive according to claim 7, wherein: said rocking member and said supporting member are formed of semiconductor material.
Claim 10
Dependent Claim
12 words
The drive according to claim 8, wherein: said semiconductor material includes silicon.
Claim 11
Dependent Claim
15 words
The drive according to claim 7, wherein: said supporting member rotatably supports said rocking member.
Claim 12
Dependent Claim
16 words
The drive according to claim 10, wherein: said supporting member is constituted of an elastic member.
Claim 13
Dependent Claim
23 words
The drive according to claim 2, wherein said galvanomirror further comprises: a sensor for sensing capacitance between said rocking member and said electrode.
Claim 14
Dependent Claim
31 words
The drive according to claim 12, wherein said galvanomirror further comprises: a circuit for correcting an amount of rocking of said rocking member based on the capacitance sensed by said sensor.
Claim 15
Dependent Claim
23 words
The optical disk drive of claim 2, wherein: said supporting member allows said rocking member to be rocked by said supporting member twisting.
Claim 16
Dependent Claim
23 words
The optical disk drive of claim 2, wherein: said supporting member allows said rocking member to be rocked by said supporting member bending.
Claim 17
Dependent Claim
28 words
The optical disk drive of claim 1, wherein: said galvanomirror is operable for rocking about an axis of rotation located near a symmetrical center line of said galvanomirror.
Claim 18
Dependent Claim
19 words
The optical disk drive of claim 1, wherein: said galvanomirror is operable to rock in at least two directions.
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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) | 2001-04-06 | 2001-10-06 | 2002-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-06 | 2005-10-06 | 2006-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-06 | 2009-10-06 | 2010-04-07 | $7700.00 | Window Closed / Lapsed |