JPS57130201A - Detecting method for eccentricity of record - Google Patents
Detecting method for eccentricity of recordInfo
- Publication number
- JPS57130201A JPS57130201A JP56014081A JP1408181A JPS57130201A JP S57130201 A JPS57130201 A JP S57130201A JP 56014081 A JP56014081 A JP 56014081A JP 1408181 A JP1408181 A JP 1408181A JP S57130201 A JPS57130201 A JP S57130201A
- Authority
- JP
- Japan
- Prior art keywords
- record
- eccentricity
- tracing
- turntable
- detected
- 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
Landscapes
- Rotational Drive Of Disk (AREA)
Abstract
PURPOSE: To prevent trouble due to the eccentricity of a record by positioning the record by detecting its eccentric state from the angular displacement of an arm which is in process of tracing the final groove of the record.
CONSTITUTION: A tone arm 5 is supported rotatably so that its stylus tip traces concentric grooves formed on a record mounted on a turntable 3 by inserting a fit shaft part 2 into the center hole 11 of the record. In tracing a final groove 12, a shutter plate 8 is positioned between a light emitting element 61 and a photodetecting element 71 and the angular displacement of the tone arm 5 is detected from variation in the quantity of light. On the other hand, a reflecting member 9 fitted at one position of the turntable 3 is detected by four optical sensors 101W104 to find the extent and direction of the eccentricity of the record 1.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56014081A JPS57130201A (en) | 1981-02-02 | 1981-02-02 | Detecting method for eccentricity of record |
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 |
---|---|---|---|
JP56014081A JPS57130201A (en) | 1981-02-02 | 1981-02-02 | Detecting method for eccentricity of record |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57130201A true JPS57130201A (en) | 1982-08-12 |
JPH0230103B2 JPH0230103B2 (en) | 1990-07-04 |
Family
ID=11851148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56014081A Granted JPS57130201A (en) | 1981-02-02 | 1981-02-02 | Detecting method for eccentricity of record |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57130201A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59157801A (en) * | 1983-02-24 | 1984-09-07 | Nakamichi Corp | Signal processing circuit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5081305A (en) * | 1973-11-17 | 1975-07-02 |
-
1981
- 1981-02-02 JP JP56014081A patent/JPS57130201A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5081305A (en) * | 1973-11-17 | 1975-07-02 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59157801A (en) * | 1983-02-24 | 1984-09-07 | Nakamichi Corp | Signal processing circuit |
JPH0435801B2 (en) * | 1983-02-24 | 1992-06-12 | Nakamichi Corp |
Also Published As
Publication number | Publication date |
---|---|
JPH0230103B2 (en) | 1990-07-04 |
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