JPS57191803A - Turntable - Google Patents

Turntable

Info

Publication number
JPS57191803A
JPS57191803A JP7558081A JP7558081A JPS57191803A JP S57191803 A JPS57191803 A JP S57191803A JP 7558081 A JP7558081 A JP 7558081A JP 7558081 A JP7558081 A JP 7558081A JP S57191803 A JPS57191803 A JP S57191803A
Authority
JP
Japan
Prior art keywords
turntable
al2o3
records
record
compound
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
JP7558081A
Other languages
Japanese (ja)
Inventor
Kazushige Ishikawa
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP7558081A priority Critical patent/JPS57191803A/en
Publication of JPS57191803A publication Critical patent/JPS57191803A/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
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive

Abstract

PURPOSE:To obtain an inexpensive turntable which is usable as a hard turntable sheet without causing damage of a record, by using Al2O3 (compound) for the turntable. CONSTITUTION:At certain temperature, Al2O3 (compound) is fused and then extruded by using the forming die for a turntable, thus obtaining the turntable formed in one body with a hard turntable sheet while having a recessed groove part which coincides with the label projecting part of a record and recessed groove parts which correspond to external circumference positions of records. Consequently, the surface hardness is lower than that of Al, records are hardly scratched and the specific gravity is greater than Al, so the inertial mass of the turntable is increased, thereby reducing wows and flutters.
JP7558081A 1981-05-19 1981-05-19 Turntable Pending JPS57191803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7558081A JPS57191803A (en) 1981-05-19 1981-05-19 Turntable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7558081A JPS57191803A (en) 1981-05-19 1981-05-19 Turntable

Publications (1)

Publication Number Publication Date
JPS57191803A true JPS57191803A (en) 1982-11-25

Family

ID=13580266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7558081A Pending JPS57191803A (en) 1981-05-19 1981-05-19 Turntable

Country Status (1)

Country Link
JP (1) JPS57191803A (en)

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