JPS55122269A - Player unit - Google Patents

Player unit

Info

Publication number
JPS55122269A
JPS55122269A JP3074279A JP3074279A JPS55122269A JP S55122269 A JPS55122269 A JP S55122269A JP 3074279 A JP3074279 A JP 3074279A JP 3074279 A JP3074279 A JP 3074279A JP S55122269 A JPS55122269 A JP S55122269A
Authority
JP
Japan
Prior art keywords
speed
turntable
circuit
player
driving motor
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
Application number
JP3074279A
Other languages
Japanese (ja)
Inventor
Makoto Goto
Yoshiaki Igarashi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3074279A priority Critical patent/JPS55122269A/en
Publication of JPS55122269A publication Critical patent/JPS55122269A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To improve a speed detection precision to make rotation control of a player simple and accurate, by detecting optically a speed change part provided in the turntable to perform servo control of the turntable driving motor. CONSTITUTION:Uneven speed change parts 4... are provided on the side face of turntable 3 and are detected by opposite detectors 7 and 5 and opposite detectors 8 and 6 such as luminous elements and photoelectric conversion elements, and a pulse is generated from waveform shaping circuits 11 and 12 at every period corresponding to the rotation speed of table 3. The driving motor of table 3 is so subjected to servo control that the sample hold voltage in sample hold circuit 14 dependent upon output pulses of circuit 12 of the saw tooth waveform generated through circuit 11 and saw tooth wave generation circuit 13 may be a prescribed fixed value, and table 3 is rotated in a fixed speed. In this case, Rotation speed detection becomes high-precision because of the use of the large-diameter turntable side part, and the fixed-speed rotation control of the player is performed simple and accurately.
JP3074279A 1979-03-15 1979-03-15 Player unit Pending JPS55122269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3074279A JPS55122269A (en) 1979-03-15 1979-03-15 Player unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3074279A JPS55122269A (en) 1979-03-15 1979-03-15 Player unit

Publications (1)

Publication Number Publication Date
JPS55122269A true JPS55122269A (en) 1980-09-19

Family

ID=12312122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3074279A Pending JPS55122269A (en) 1979-03-15 1979-03-15 Player unit

Country Status (1)

Country Link
JP (1) JPS55122269A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523775U (en) * 1992-06-05 1993-03-26 フアナツク株式会社 Rotating device
US5504723A (en) * 1990-03-15 1996-04-02 Cyberkinetics, Ltd. Apparatus for controlling movement of a compact disk carousel and a compact disk insertion/extraction arm

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504723A (en) * 1990-03-15 1996-04-02 Cyberkinetics, Ltd. Apparatus for controlling movement of a compact disk carousel and a compact disk insertion/extraction arm
JPH0523775U (en) * 1992-06-05 1993-03-26 フアナツク株式会社 Rotating device

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