JPS54107307A - Record player - Google Patents

Record player

Info

Publication number
JPS54107307A
JPS54107307A JP1385978A JP1385978A JPS54107307A JP S54107307 A JPS54107307 A JP S54107307A JP 1385978 A JP1385978 A JP 1385978A JP 1385978 A JP1385978 A JP 1385978A JP S54107307 A JPS54107307 A JP S54107307A
Authority
JP
Japan
Prior art keywords
end parts
thru
turntable
reception
axial center
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
JP1385978A
Other languages
Japanese (ja)
Inventor
Yoshimoto Omura
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP1385978A priority Critical patent/JPS54107307A/en
Publication of JPS54107307A publication Critical patent/JPS54107307A/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
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • G11B19/124—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving the detection of diameter of disks

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To achieve the improvement in the detection accuracy of record sizes by disposing the portion of performing emission and reception of light near the axial center of the turntable. CONSTITUTION:Emission and reception of light are accomplished between one end parts 11a, 12a of photoconductive members 11, 12 and the other end parts 5b, 6b, 7b, 8b of photoconductive members 5 and 6, 7 and 8. These other end parts 5b thru 8b are disposed near the spindle 9 of the axial center of the turn table 1. Hence, the peripheral speeds at which the other end parts 5b thru 8b rotate along with the revolution of the turntable 1 become low and the time at which the other end parts 5b thru 8b pass over the one end parts 11a, 12a becomes longer, by which the pulses of a large pulse width may be obtained from a photo detector 14, and the accuracy of record size discrimination may be enhanced.
JP1385978A 1978-02-09 1978-02-09 Record player Pending JPS54107307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1385978A JPS54107307A (en) 1978-02-09 1978-02-09 Record player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1385978A JPS54107307A (en) 1978-02-09 1978-02-09 Record player

Publications (1)

Publication Number Publication Date
JPS54107307A true JPS54107307A (en) 1979-08-23

Family

ID=11844985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1385978A Pending JPS54107307A (en) 1978-02-09 1978-02-09 Record player

Country Status (1)

Country Link
JP (1) JPS54107307A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5677951A (en) * 1979-11-29 1981-06-26 Matsushita Electric Ind Co Ltd Record player
JPS5741111U (en) * 1980-08-20 1982-03-05

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5677951A (en) * 1979-11-29 1981-06-26 Matsushita Electric Ind Co Ltd Record player
JPS5741111U (en) * 1980-08-20 1982-03-05

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