JPS5522269A - Record disk detecting device - Google Patents

Record disk detecting device

Info

Publication number
JPS5522269A
JPS5522269A JP9485178A JP9485178A JPS5522269A JP S5522269 A JPS5522269 A JP S5522269A JP 9485178 A JP9485178 A JP 9485178A JP 9485178 A JP9485178 A JP 9485178A JP S5522269 A JPS5522269 A JP S5522269A
Authority
JP
Japan
Prior art keywords
record disk
diodes
ambient light
photoelectric conversion
output
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
JP9485178A
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 JP9485178A priority Critical patent/JPS5522269A/en
Publication of JPS5522269A publication Critical patent/JPS5522269A/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

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To eliminate the effect of the ambient light and thus to obtain an economical detecting device which is free from malfunction by using the photoelectric conversion element to detect optically the record disk on the turntable plus another photoelectric conversion element to detect the ambient light respectively. CONSTITUTION:Three units of through-holes 2a, 2b and 2c are provided on turntable 1 to identify the record disk size, and light emitting diodes 4a, 4b and 4c are provided on substrate 3 to correspond to the three though-holes. At the same time, photoelectric conversion elements 5a and 5b are provided at the upper part of table 1 to receive the light from the diodes and only the ambient light respectively. In logic arithmetic circuit 6, the pulse of frequency of about 1KHz is converted into three-phase A, B and C to emit diodes 4a, 4b and 4c in time division and sequentially. Then the output of element 5 which received the light from the diodes is compared with the output of element 5b at comparator 13. And the effect of the ambient light is subtracted, and this output undergoes a logic operation with pulses A, B and C to obtain signals G, H and I to identify the size of the record disk.
JP9485178A 1978-08-02 1978-08-02 Record disk detecting device Pending JPS5522269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9485178A JPS5522269A (en) 1978-08-02 1978-08-02 Record disk detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9485178A JPS5522269A (en) 1978-08-02 1978-08-02 Record disk detecting device

Publications (1)

Publication Number Publication Date
JPS5522269A true JPS5522269A (en) 1980-02-16

Family

ID=14121522

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9485178A Pending JPS5522269A (en) 1978-08-02 1978-08-02 Record disk detecting device

Country Status (1)

Country Link
JP (1) JPS5522269A (en)

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