JPS57130273A - Automatic positioning method for record - Google Patents

Automatic positioning method for record

Info

Publication number
JPS57130273A
JPS57130273A JP1486081A JP1486081A JPS57130273A JP S57130273 A JPS57130273 A JP S57130273A JP 1486081 A JP1486081 A JP 1486081A JP 1486081 A JP1486081 A JP 1486081A JP S57130273 A JPS57130273 A JP S57130273A
Authority
JP
Japan
Prior art keywords
record
center
signals
rotation
turntable
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
JP1486081A
Other languages
Japanese (ja)
Other versions
JPS6259384B2 (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 JP1486081A priority Critical patent/JPS57130273A/en
Priority to US06/343,878 priority patent/US4441178A/en
Publication of JPS57130273A publication Critical patent/JPS57130273A/en
Publication of JPS6259384B2 publication Critical patent/JPS6259384B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B7/31—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B7/312—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To make the record center coincident with the center of rotation of a turntable, by detecting the eccentricity of the record center from the center of rotation of the turntable by using the final groove of the record. CONSTITUTION:To trace the final groove 12 of a record 1, a tone arm 5 has a shutter plate 8 arranged between a light emitting element 61 and a photodetecting element 71. This optical sensor generates an electric signal V which corresponds to the angular displacement of the tone arm 5. Optical sensors 101-104 consisting of light emitting elements 62-65 and photodetecting elements 72- 75 arranged and fixed at 90 deg. rotation angle intervals generate position signals P1-P4 when a reflecting member 9 fitted to the circumferential side surface of a turntable 3 arrives. By detecting electric signals V1-V4 when the position signals P1-P4 are generated, signals V1 and V3 are information on the eccentricity of the record 1 from the rotation center of the turn table 3 in the direction X-X, and signals V2 and V4 is that in the direction Y-Y.
JP1486081A 1981-02-02 1981-02-03 Automatic positioning method for record Granted JPS57130273A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1486081A JPS57130273A (en) 1981-02-03 1981-02-03 Automatic positioning method for 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
JP1486081A JPS57130273A (en) 1981-02-03 1981-02-03 Automatic positioning method for record

Publications (2)

Publication Number Publication Date
JPS57130273A true JPS57130273A (en) 1982-08-12
JPS6259384B2 JPS6259384B2 (en) 1987-12-10

Family

ID=11872775

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1486081A Granted JPS57130273A (en) 1981-02-02 1981-02-03 Automatic positioning method for record

Country Status (1)

Country Link
JP (1) JPS57130273A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109029514A (en) * 2018-07-13 2018-12-18 重庆理工大学 Gating angular displacement measuring system when single-code channel absolute type

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5468603A (en) * 1977-11-11 1979-06-01 Sanyo Electric Co Ltd Reducing system of variations of time axis of disc player

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5468603A (en) * 1977-11-11 1979-06-01 Sanyo Electric Co Ltd Reducing system of variations of time axis of disc player

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109029514A (en) * 2018-07-13 2018-12-18 重庆理工大学 Gating angular displacement measuring system when single-code channel absolute type

Also Published As

Publication number Publication date
JPS6259384B2 (en) 1987-12-10

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