JPS5512582A - Detector for record disc - Google Patents

Detector for record disc

Info

Publication number
JPS5512582A
JPS5512582A JP8557278A JP8557278A JPS5512582A JP S5512582 A JPS5512582 A JP S5512582A JP 8557278 A JP8557278 A JP 8557278A JP 8557278 A JP8557278 A JP 8557278A JP S5512582 A JPS5512582 A JP S5512582A
Authority
JP
Japan
Prior art keywords
ultrasonic
record disc
microphones
speakers
holes
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
JP8557278A
Other languages
Japanese (ja)
Inventor
Akira Oinuma
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 JP8557278A priority Critical patent/JPS5512582A/en
Publication of JPS5512582A publication Critical patent/JPS5512582A/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

  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Abstract

PURPOSE:To enable to detect the presence and size of the record disc, by providing a plurality of ultrasonic microphones and ultrasonic speakers corresponding to them. CONSTITUTION:A plurality of through-holes 24A to 24C are placed from the center of the turn table 23 radially which is fitted to the rotary shaft 22 and turned unifiedly with the shaft. The ultrasonic microphones 26A to 26C are placed on the player main body 21 corresponding to the through-holes, and the ultrasonic speakers 27A to 27C are placed corresponding to each microphone via the turn table. Thus, the ultrasonic waves emitted from the speakers 27A to 27C are detected with the microphones 26A to 26C and the detection signal is processed at the signal processing circuit, allowing to discriminate the presence and the size of the record disc 25 with non-contact.
JP8557278A 1978-07-12 1978-07-12 Detector for record disc Pending JPS5512582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8557278A JPS5512582A (en) 1978-07-12 1978-07-12 Detector for record disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8557278A JPS5512582A (en) 1978-07-12 1978-07-12 Detector for record disc

Publications (1)

Publication Number Publication Date
JPS5512582A true JPS5512582A (en) 1980-01-29

Family

ID=13862518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8557278A Pending JPS5512582A (en) 1978-07-12 1978-07-12 Detector for record disc

Country Status (1)

Country Link
JP (1) JPS5512582A (en)

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