JPS5718032A - Focus error detecting device - Google Patents
Focus error detecting deviceInfo
- Publication number
- JPS5718032A JPS5718032A JP9132880A JP9132880A JPS5718032A JP S5718032 A JPS5718032 A JP S5718032A JP 9132880 A JP9132880 A JP 9132880A JP 9132880 A JP9132880 A JP 9132880A JP S5718032 A JPS5718032 A JP S5718032A
- Authority
- JP
- Japan
- Prior art keywords
- divided
- photodivider
- focus
- positions
- light
- 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.)
- Pending
Links
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
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To eliminate an effect of flaws or the like at the twilled part of photodivider, by setting the photodivider at the front side of the conjugate point of the light reflected from a disk surface. CONSTITUTION:The light emitted from a light source 2 is irradiated on a disk surface 1 through a condenser lens 3, and this reflected light is led to a photodivider 5 with a half-mirror 4. Then divided luminous fluxes 9g and 9h have the focal points at the boundaries 7a and 7b among divided detectors 6o, 6i, 7o and 7i which are distributed at the positions corresponding to the conjugate points on the surface 1 during a just-in-focus. When the surface 1 moves up and down to get the focus position out of the positions of divided detectors, the fluxes 9g and 9h irradiate the inside or the outside of the divided detector. As a result, the positive and negative signals are delivered to the terminal 11 to ensure a detection for an out-of-focus. The inclination of a photodisk, if arises, is cancelled to give no effect since the irradiating positions of divided luminous fluxes shift in the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9132880A JPS5718032A (en) | 1980-07-04 | 1980-07-04 | Focus error detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9132880A JPS5718032A (en) | 1980-07-04 | 1980-07-04 | Focus error detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5718032A true JPS5718032A (en) | 1982-01-29 |
Family
ID=14023376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9132880A Pending JPS5718032A (en) | 1980-07-04 | 1980-07-04 | Focus error detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5718032A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04261944A (en) * | 1991-02-15 | 1992-09-17 | Mitsui Constr Co Ltd | Structure for earthquake resisting wall and beam |
-
1980
- 1980-07-04 JP JP9132880A patent/JPS5718032A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04261944A (en) * | 1991-02-15 | 1992-09-17 | Mitsui Constr Co Ltd | Structure for earthquake resisting wall and beam |
| JP2536795B2 (en) * | 1991-02-15 | 1996-09-18 | 三井建設株式会社 | Seismic wall and beam structure |
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