JPS5577041A - Optical recording carrier reader - Google Patents
Optical recording carrier readerInfo
- Publication number
- JPS5577041A JPS5577041A JP15134378A JP15134378A JPS5577041A JP S5577041 A JPS5577041 A JP S5577041A JP 15134378 A JP15134378 A JP 15134378A JP 15134378 A JP15134378 A JP 15134378A JP S5577041 A JPS5577041 A JP S5577041A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- servo control
- detector
- information
- detection
- 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
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To make rapid and stable leading-in of automatic focus control of a reading optical system possible by opening a gate to perform servo control of the optical system dependent upon phase comparison only when read information dependent upon a photo detector becomes over a prescribed value.
CONSTITUTION: Information of disc 17 is read by photo detectors 18a and 18b, and the detection output of detector 18b passes through BPF19, envelope detector 23 and waveform shaping circuit 24; and when the detection output becomes over a prescribed value, gate 22 is opened. Therefore, a signal according to phase difference of detection outputs of detectors 18a and 18b generated by phase comparator 21 is applied to voice coil 27 to perform servo control of focusing of object lens 16 of the reading optical system. Consequently, this servo control does not respond to needless noise and detection outputs of information non-recording parts and recording parts, and leading-in of automatic control is performed rapidly and stably even if a system of a narrow focus error detection range is adopted.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15134378A JPS5577041A (en) | 1978-12-06 | 1978-12-06 | Optical recording carrier reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15134378A JPS5577041A (en) | 1978-12-06 | 1978-12-06 | Optical recording carrier reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5577041A true JPS5577041A (en) | 1980-06-10 |
Family
ID=15516487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15134378A Pending JPS5577041A (en) | 1978-12-06 | 1978-12-06 | Optical recording carrier reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5577041A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58102340A (en) * | 1981-12-11 | 1983-06-17 | Teac Co | Optical reproducing device |
EP0569942A2 (en) * | 1992-05-12 | 1993-11-18 | United Parcel Service Of America, Inc. | Voice coil focusing system |
-
1978
- 1978-12-06 JP JP15134378A patent/JPS5577041A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58102340A (en) * | 1981-12-11 | 1983-06-17 | Teac Co | Optical reproducing device |
JPS6343814B2 (en) * | 1981-12-11 | 1988-09-01 | Teac Corp | |
EP0569942A2 (en) * | 1992-05-12 | 1993-11-18 | United Parcel Service Of America, Inc. | Voice coil focusing system |
EP0569942A3 (en) * | 1992-05-12 | 1994-01-12 | United Parcel Service Inc |
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