US4683559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical pickup with a two-detector arrangement
Assignee: Ricoh Co Ltd
•
Filing: 1984-04-19
•
Granted: 1987-07-28
•
Expires: 2004-04-19
Abstract
Abstract An optical pickup for detecting a distance to an optical disk on which information is optically stored includes a tracking error detecting device for detecting a tracking error by receiving a part of the light reflected from the disk and a focusing error detecting device for detecting the remaining part of the light reflected from the disk, structured such that the tracking error detecting device receives 60% or more of the reflected light.
Inventors
- 👤 Masami Emoto
- 👤 Hiroshi Gotoh
- 👤 Hideo Inuzuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:31
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0901; G11B7/0908; G11B7/0916; G11B7/12; G11B7/13
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
An optical pickup for detecting the position of a subject in a first direction and second direction, comprising: a light source; an optical system for directing a light beam emitted from said light source onto said subject and for collecting a reflected light beam for said subject; first detecting means for detecting the position of said subject in a first direction by receiving a first part of said reflected light beam; and second detecting means for detecting the position of said subject in a second direction which is different from said first direction by receiving a second part of said reflected light beam, said first part being larger in amount than said second part.
Claim 2
Dependent Claim
114 words
An optical pickup for detecting the position of a subject in a first direction and second direction, comprising: a light source; an optical system for directing a light beam emitted from said light source onto said subject and for collecting a reflected light beam for said subject; first detecting means for detecting the position of said subject in a first direction by receiving a first part of said reflected light beam; and second detecting means for detecting the position of said subject in a second direction which is different from said first direction by receiving a second part of said reflected light beam, said first part being larger in amount than said second part.
Claim 3
Dependent Claim
19 words
The optical pickup of claim 1 wheren said subject is an optical disk on which information is optically stored.
Claim 4
Dependent Claim
23 words
The optical pickup of claim 2 wherein said optical disk is provided with a plurality of tracks along which information is optically recorded.
Claim 5
Dependent Claim
25 words
The optical pickup of claim 3 wherein said first detecting means includes a tracking error detecting device for detecting a tracking error of said disk.
Claim 6
Dependent Claim
34 words
The optical pickup of claim 4 wherein said tracking error detecting device is comprised of a pair of light receiving elements arranged side-by-side, with the partition line therebetween directed in parallel with said tracks.
Claim 7
Dependent Claim
25 words
The optical pickup of claim 4 wherein said second detecting means includes a focusing error detecting device for detecting a focusing error of said disk.
Claim 8
Dependent Claim
40 words
The optical pickup of claim 6 wherein said focusing error detecting device is comprised of a pair of light receiving elements arranged side-by-side, with the partition line therebetween directed perpendicular to said partition line of said tracking error detecting device.
Claim 9
Dependent Claim
36 words
The optical pickup of claim 6 wherein said tracking error detecting device receives 60% or more of said reflected light beam and said focusing error detecting device receives the remaining % of said reflected light beam.
Claim 10
Dependent Claim
33 words
The optical pickup of claim 6 wherein said tracking error detecting device receives 60-90% of said reflected light beam and said focusing error detecting device correspondingly receives 40-10% of said reflected light beam.
Claim 11
Dependent Claim
24 words
The optical pickup of claim 2 including means for producing a signal indicating the information stored in said disk from said first detecting means.
References Cited (Backward Citations)
US4414658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |