JPS57150101A - Detecting method for eccentricity of record disc - Google Patents
Detecting method for eccentricity of record discInfo
- Publication number
- JPS57150101A JPS57150101A JP3421381A JP3421381A JPS57150101A JP S57150101 A JPS57150101 A JP S57150101A JP 3421381 A JP3421381 A JP 3421381A JP 3421381 A JP3421381 A JP 3421381A JP S57150101 A JPS57150101 A JP S57150101A
- Authority
- JP
- Japan
- Prior art keywords
- arm
- eccentricity
- record disc
- rotating angle
- sensors
- 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.)
- Granted
Links
Abstract
PURPOSE: To simply detect the eccentricity of a record disc, by detecting a rotating angle for 4 points, when an arm tracing a cutting groove with a recording stylus moving at a constant speed passes over three separated points with a rotating angle of 90° partly duplicatedly.
CONSTITUTION: A reflecting member 11 is fitted at one part of a circumference of a turntable 4, and optical sensors 101W103 consisting of light emitting elements L1WL3 and photodetectors R1WR3 are arranged at a position apart by 90°. A cutting groove is traced with a recording stylus moving at a constant speed on a tone arm 6 supported on a base plate 7 freely turnably which moves toward the direction A-A in parallel with a prolonged line of the sensors 101 and 103, and the rotating angle of the arm when the arm passes through the sensors 101W103 and the sensor 101 is detected with an optical sensor 100. The eccentricity of a record disc can be detected simply through the operation of data.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3421381A JPS57150101A (en) | 1981-03-10 | 1981-03-10 | Detecting method for eccentricity of record disc |
US06/343,878 US4441178A (en) | 1981-02-02 | 1982-01-29 | Method of correcting a position of a disk record on a turntable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3421381A JPS57150101A (en) | 1981-03-10 | 1981-03-10 | Detecting method for eccentricity of record disc |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57150101A true JPS57150101A (en) | 1982-09-16 |
JPS645361B2 JPS645361B2 (en) | 1989-01-30 |
Family
ID=12407874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3421381A Granted JPS57150101A (en) | 1981-02-02 | 1981-03-10 | Detecting method for eccentricity of record disc |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57150101A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5081305A (en) * | 1973-11-17 | 1975-07-02 |
-
1981
- 1981-03-10 JP JP3421381A patent/JPS57150101A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5081305A (en) * | 1973-11-17 | 1975-07-02 |
Also Published As
Publication number | Publication date |
---|---|
JPS645361B2 (en) | 1989-01-30 |
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