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JPS5512584A - Detector for record disc - Google Patents

Detector for record disc

Info

Publication number
JPS5512584A
JPS5512584A JP8557478A JP8557478A JPS5512584A JP S5512584 A JPS5512584 A JP S5512584A JP 8557478 A JP8557478 A JP 8557478A JP 8557478 A JP8557478 A JP 8557478A JP S5512584 A JPS5512584 A JP S5512584A
Authority
JP
Japan
Prior art keywords
ultrasonic
holes
angle detector
position angle
record disc
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
JP8557478A
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 JP8557478A priority Critical patent/JPS5512584A/en
Publication of JPS5512584A publication Critical patent/JPS5512584A/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)
  • Feeding And Guiding Record Carriers (AREA)

Abstract

PURPOSE:To enable to detect the presence and size of the record disc with non- contact, by providing an ultrasonic speaker emitting different ultrasonic wave signal to a plurality of ultrasonic microphones and the turntable position angle detector. CONSTITUTION:A plurality of through-holes 24A to 24C are placed from the center of the turntable 23 radially which is fitted to the rotary shaft 22 and turned unifiedly with this shaft. The reversible electro-acoustic converters 26A to 26C which act like the ultrasonic microphone and speaker are provided with the player main body 21 corresponding to the through-holes. Further, the reflection plates 27A and 27B are placed inside the external circumference of the table 23 corresponding to the through-holes and the photo electric elements 28A and 28B as the position angle detector are provided to the main body 21 corresponding to the reflection plates. Thus, the presence and size of the record disc can be detected with non-contact and the power consumption of player can be restricted since the position angle detector controls the period of ultrasonic wave emission.
JP8557478A 1978-07-12 1978-07-12 Detector for record disc Pending JPS5512584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8557478A JPS5512584A (en) 1978-07-12 1978-07-12 Detector for record disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8557478A JPS5512584A (en) 1978-07-12 1978-07-12 Detector for record disc

Publications (1)

Publication Number Publication Date
JPS5512584A true JPS5512584A (en) 1980-01-29

Family

ID=13862575

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8557478A Pending JPS5512584A (en) 1978-07-12 1978-07-12 Detector for record disc

Country Status (1)

Country Link
JP (1) JPS5512584A (en)

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