Patent US4637004A successfully refreshed from Google Patents.
US4637004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical data reading device
Assignee: Pioneer Corp
•
Filing: 1985-03-22
•
Granted: 1987-01-13
•
Expires: 2005-03-22
Abstract
Abstract An optical data reading device wherein an optical pick-up head (10), which reads the light reflected from a disk data recording carrier (1) by detecting a light flux (8) onto a data track of the disk, is movable radially of the disk along a carrier (15) that is tiltable about an axis (18). The spacing between the optical pick-up head and the disk may then be kept almost constant by tilting the mounting plate and optical pick-up head in response to an output signal of a detector which detects warp of the disk.
Inventors
- 👤 Yoshitsugu Araki
- 👤 Taichi Akiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:14
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/085; G11B7/0857; G11B7/08582; G11B7/09; G11B7/095; G11B7/0956
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
An optical data reading device comprising means for supporting and rotating a disk; an optical pick-up head which reads data by focusing light, in use, onto a data track of the disk and detecting the light reflected from the data track; a carrier for supporting the head; means for moving the head to and fro along the carrier radially of the disk; and means for tilting the carrier about an axis extending perpendicularly to an axial plane of the disk containing the radial direction of movement of the head; whereby variation in the spacing of the head from the disk owing to warp of the disk may be at least partially compensated.
Claim 2
Dependent Claim
112 words
An optical data reading device comprising means for supporting and rotating a disk; an optical pick-up head which reads data by focusing light, in use, onto a data track of the disk and detecting the light reflected from the data track; a carrier for supporting the head; means for moving the head to and fro along the carrier radially of the disk; and means for tilting the carrier about an axis extending perpendicularly to an axial plane of the disk containing the radial direction of movement of the head; whereby variation in the spacing of the head from the disk owing to warp of the disk may be at least partially compensated.
Claim 3
Dependent Claim
42 words
A device according to claim 1, wherein the carrier comprises a plate located in the axial plane and pivoted about the axis on a base; and guide rail means which is fixed to the plate and along which the head is slidable.
Claim 4
Dependent Claim
27 words
A device according to claim 2, wherein the tilting means comprises a tilt motor mounted on the base and coupled to the plate by a lead screw.
Claim 5
Dependent Claim
29 words
A device according to claim 2, wherein the headmoving means comprises a motor mounted on the plate and driving a pinion which engages a rack fixed to the head.
Claim 6
Dependent Claim
31 words
A device according to claim 1, further comprising a warp detector for sensing warp of the disk and providing a compensating signal, the tilting means being responsive to the compensating signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |