JPS57130201A - Detecting method for eccentricity of record - Google Patents

Detecting method for eccentricity of record

Info

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
Application number
JP56014081A
Other languages
Japanese (ja)
Other versions
JPH0230103B2 (en
Inventor
Kozo Kobayashi
Hiroshi Meguro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nakamichi Corp
Original Assignee
Nakamichi Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nakamichi Corp filed Critical Nakamichi Corp
Priority to JP56014081A priority Critical patent/JPS57130201A/en
Priority to US06/343,878 priority patent/US4441178A/en
Publication of JPS57130201A publication Critical patent/JPS57130201A/en
Publication of JPH0230103B2 publication Critical patent/JPH0230103B2/ja
Granted legal-status Critical Current

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
JP56014081A 1981-02-02 1981-02-02 Detecting method for eccentricity of record Granted JPS57130201A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59157801A (en) * 1983-02-24 1984-09-07 Nakamichi Corp Signal processing circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081305A (en) * 1973-11-17 1975-07-02

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081305A (en) * 1973-11-17 1975-07-02

Cited By (2)

* Cited by examiner, † Cited by third party
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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