JPS5769537A - Focus adjusting device - Google Patents
Focus adjusting deviceInfo
- Publication number
- JPS5769537A JPS5769537A JP14444480A JP14444480A JPS5769537A JP S5769537 A JPS5769537 A JP S5769537A JP 14444480 A JP14444480 A JP 14444480A JP 14444480 A JP14444480 A JP 14444480A JP S5769537 A JPS5769537 A JP S5769537A
- Authority
- JP
- Japan
- Prior art keywords
- actuator
- error signal
- circuit
- detected
- optical axis
- 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
Abstract
PURPOSE:To position automatically an actuator correctly, by oscillating the actuator in the direction of the optical axis of an object lens and by stopping the oscillation when a required focus error signal is detected and by performing the focus adjustment on the basis of the error signal. CONSTITUTION:An actuator 1 is oscillated in the direction of the optical axis through a sawtooth wave generating circuit 41, a motor driving circuit 40, and a motor 15 to bring an object lens fitted to the actuator 1 into a range where autofocusing due to a focusing driving mechanism is possible. A required focus error signal is detected through an optical system 33 and a focus error signal detecting circuit 34, and a focusing point is detected by a focus detecting circuit 37, and at this time, the circuit 41 is stopped to operate a focusing driving circuit 39. When DC components of the error signal is fluctuated by the warp or the like of a disc 32, the actuator 1 displaced in the direction of the optical axis through DC components detecting circuit 38 and the driving circuit 40. Thus, the actuator is always positioned correctly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14444480A JPS5769537A (en) | 1980-10-17 | 1980-10-17 | Focus adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14444480A JPS5769537A (en) | 1980-10-17 | 1980-10-17 | Focus adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5769537A true JPS5769537A (en) | 1982-04-28 |
Family
ID=15362357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14444480A Pending JPS5769537A (en) | 1980-10-17 | 1980-10-17 | Focus adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5769537A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58173032U (en) * | 1982-05-11 | 1983-11-18 | パイオニアビデオ株式会社 | Focus lens movement control device in optical equipment |
-
1980
- 1980-10-17 JP JP14444480A patent/JPS5769537A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58173032U (en) * | 1982-05-11 | 1983-11-18 | パイオニアビデオ株式会社 | Focus lens movement control device in optical equipment |
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