JPH0213374B2 - - Google Patents
Info
- Publication number
- JPH0213374B2 JPH0213374B2 JP55177024A JP17702480A JPH0213374B2 JP H0213374 B2 JPH0213374 B2 JP H0213374B2 JP 55177024 A JP55177024 A JP 55177024A JP 17702480 A JP17702480 A JP 17702480A JP H0213374 B2 JPH0213374 B2 JP H0213374B2
- Authority
- JP
- Japan
- Prior art keywords
- focus lens
- lens
- error signal
- focus
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 3
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17702480A JPS57100636A (en) | 1980-12-15 | 1980-12-15 | Optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17702480A JPS57100636A (en) | 1980-12-15 | 1980-12-15 | Optical information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57100636A JPS57100636A (en) | 1982-06-22 |
JPH0213374B2 true JPH0213374B2 (de) | 1990-04-04 |
Family
ID=16023817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17702480A Granted JPS57100636A (en) | 1980-12-15 | 1980-12-15 | Optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57100636A (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914138A (ja) * | 1982-07-14 | 1984-01-25 | Minolta Camera Co Ltd | 光デイスクのトラツキング制御光学系 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55135340A (en) * | 1979-04-06 | 1980-10-22 | Discovision Ass | Apparatus for keeping scanning means in place |
-
1980
- 1980-12-15 JP JP17702480A patent/JPS57100636A/ja active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55135340A (en) * | 1979-04-06 | 1980-10-22 | Discovision Ass | Apparatus for keeping scanning means in place |
Also Published As
Publication number | Publication date |
---|---|
JPS57100636A (en) | 1982-06-22 |
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