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JPS5512580A - Detector for record disc - Google Patents

Detector for record disc

Info

Publication number
JPS5512580A
JPS5512580A JP8557078A JP8557078A JPS5512580A JP S5512580 A JPS5512580 A JP S5512580A JP 8557078 A JP8557078 A JP 8557078A JP 8557078 A JP8557078 A JP 8557078A JP S5512580 A JPS5512580 A JP S5512580A
Authority
JP
Japan
Prior art keywords
ultrasonic
microphones
main body
holes
turntable
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
JP8557078A
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 JP8557078A priority Critical patent/JPS5512580A/en
Publication of JPS5512580A publication Critical patent/JPS5512580A/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 of the record disc and the size of it with non-contact method, by using common ultrasonic speaker to a plurality of ultrasonic microphones and matching the resonant frequency of the both with a single frequency. CONSTITUTION:A pulrality of through-holes 24A to 24C are placed at the position different in radius respectively on the straight lines extended from the center of the turntable 23 radially which is mounted on the turn shaft 22 and turned unifiedly with the shaft 22. Ultrasonic microphones 26A to 26C are placed on the straight line of the player main body corresponding to the through-holes, common ultrasonic speaker 27 is provided by opposing to each microphone through the table 23, and the ultrasonic frequency signal in a single frequency is emitted to the microphones 26A to 26C. Further, the reflection plates 28A to 28C as the turntable position angle detector are provided corresponding to each through-hole inside the table external circumference, and the photo electric conversion element 29 is placed at the specific part of the main body 21.
JP8557078A 1978-07-12 1978-07-12 Detector for record disc Pending JPS5512580A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8557078A JPS5512580A (en) 1978-07-12 1978-07-12 Detector for record disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8557078A JPS5512580A (en) 1978-07-12 1978-07-12 Detector for record disc

Publications (1)

Publication Number Publication Date
JPS5512580A true JPS5512580A (en) 1980-01-29

Family

ID=13862462

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8557078A Pending JPS5512580A (en) 1978-07-12 1978-07-12 Detector for record disc

Country Status (1)

Country Link
JP (1) JPS5512580A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56170571U (en) * 1980-05-21 1981-12-16
JPS58164056A (en) * 1982-03-20 1983-09-28 Pioneer Electronic Corp Disk player
JPS58164059A (en) * 1982-03-20 1983-09-28 Pioneer Electronic Corp Disk player
EP0753846A1 (en) * 1995-07-13 1997-01-15 Sony Corporation Apparatus for producing optical disc and method of production thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56170571U (en) * 1980-05-21 1981-12-16
JPS58164056A (en) * 1982-03-20 1983-09-28 Pioneer Electronic Corp Disk player
JPS58164059A (en) * 1982-03-20 1983-09-28 Pioneer Electronic Corp Disk player
JPH0452545B2 (en) * 1982-03-20 1992-08-24 Pioneer Electronic Corp
JPH0452544B2 (en) * 1982-03-20 1992-08-24 Pioneer Electronic Corp
EP0753846A1 (en) * 1995-07-13 1997-01-15 Sony Corporation Apparatus for producing optical disc and method of production thereof

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