JPS641858B2 - - Google Patents
Info
- Publication number
- JPS641858B2 JPS641858B2 JP13699679A JP13699679A JPS641858B2 JP S641858 B2 JPS641858 B2 JP S641858B2 JP 13699679 A JP13699679 A JP 13699679A JP 13699679 A JP13699679 A JP 13699679A JP S641858 B2 JPS641858 B2 JP S641858B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflected
- error signal
- objective lens
- prism
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005236 sound signal 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
- 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
Landscapes
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13699679A JPS5661044A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
| GB8020097A GB2057218B (en) | 1979-06-25 | 1980-06-19 | Detecting focussing error |
| NL8003659A NL192406C (nl) | 1979-06-25 | 1980-06-24 | Inrichting voor het detecteren van een focusseringsfoutsignaal voor een objectieflens bij het aftasten van een informatiedrager. |
| FR8014007A FR2459991A1 (fr) | 1979-06-25 | 1980-06-24 | Procede et dispositif de detection d'un signal d'erreur de focalisation |
| DE19803023779 DE3023779A1 (de) | 1979-06-25 | 1980-06-25 | Verfahren zum feststellen der scharfeinstellung eines objektivs in bezug auf einen gegenstand und vorrichtung zur durchfuehrung des verfahrens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13699679A JPS5661044A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5661044A JPS5661044A (en) | 1981-05-26 |
| JPS641858B2 true JPS641858B2 (nl) | 1989-01-12 |
Family
ID=15188344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13699679A Granted JPS5661044A (en) | 1979-06-25 | 1979-10-25 | Optical information reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5661044A (nl) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5766533A (en) * | 1980-10-09 | 1982-04-22 | Olympus Optical Co Ltd | Optical information reader |
| JPS6043240A (ja) * | 1983-08-19 | 1985-03-07 | Mitsubishi Electric Corp | 光学的信号読出装置 |
-
1979
- 1979-10-25 JP JP13699679A patent/JPS5661044A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5661044A (en) | 1981-05-26 |
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