KR840006334U - 초점오차 검출장치 - Google Patents
초점오차 검출장치Info
- Publication number
- KR840006334U KR840006334U KR2019830005284U KR830005284U KR840006334U KR 840006334 U KR840006334 U KR 840006334U KR 2019830005284 U KR2019830005284 U KR 2019830005284U KR 830005284 U KR830005284 U KR 830005284U KR 840006334 U KR840006334 U KR 840006334U
- Authority
- KR
- South Korea
- Prior art keywords
- detection device
- error detection
- focus error
- focus
- error
- Prior art date
Links
- 238000001514 detection method Methods 0.000 title 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
- G11B7/0908—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 for focusing only
- G11B7/0909—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 for focusing only by astigmatic methods
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP90828 | 1982-06-17 | ||
| JP1982090828U JPS58193335U (ja) | 1982-06-17 | 1982-06-17 | フオ−カスエラ−検出装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR840006334U true KR840006334U (ko) | 1984-12-03 |
| KR880001788Y1 KR880001788Y1 (ko) | 1988-05-11 |
Family
ID=14009445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019830005284U KR880001788Y1 (ko) | 1982-06-17 | 1983-06-16 | 초점오차 검출장치 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4631396A (ko) |
| JP (1) | JPS58193335U (ko) |
| KR (1) | KR880001788Y1 (ko) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8600253A (nl) * | 1986-02-03 | 1987-09-01 | Philips Nv | Optisch afbeeldingssysteem voorzien van een opto-elektronisch fokusfoutdetektiestelsel. |
| US5036185A (en) * | 1988-12-27 | 1991-07-30 | Kabushiki Kaisha Toshiba | Optical apparatus for detecting a focusing state |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4025949A (en) * | 1975-12-31 | 1977-05-24 | Zenith Radio Corporation | Symmetrical astigmatic focus sensing system |
| JPS5317705A (en) * | 1976-08-02 | 1978-02-18 | Hitachi Ltd | Automatic focusing system |
| JPS5538639A (en) * | 1978-09-07 | 1980-03-18 | Pioneer Video Corp | Servo drawing-in unit for focus lens of optical information reader |
-
1982
- 1982-06-17 JP JP1982090828U patent/JPS58193335U/ja active Pending
-
1983
- 1983-06-16 KR KR2019830005284U patent/KR880001788Y1/ko not_active IP Right Cessation
- 1983-06-16 US US06/504,800 patent/US4631396A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58193335U (ja) | 1983-12-22 |
| US4631396A (en) | 1986-12-23 |
| KR880001788Y1 (ko) | 1988-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 19920501 Year of fee payment: 5 |
|
| LAPS | Lapse due to unpaid annual fee |