JPS5522265A - Record disk detecting device - Google Patents

Record disk detecting device

Info

Publication number
JPS5522265A
JPS5522265A JP9484778A JP9484778A JPS5522265A JP S5522265 A JPS5522265 A JP S5522265A JP 9484778 A JP9484778 A JP 9484778A JP 9484778 A JP9484778 A JP 9484778A JP S5522265 A JPS5522265 A JP S5522265A
Authority
JP
Japan
Prior art keywords
photoelectric conversion
record disk
light
turntable
light emitting
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
JP9484778A
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 JP9484778A priority Critical patent/JPS5522265A/en
Publication of JPS5522265A publication Critical patent/JPS5522265A/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

  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

PURPOSE:To secure the detection for the presence and the size of the record disk to be put on the turntable through a simple modification by providing the light reflecting surface on the upper surface of the turntable of the record player and then the light emitting element and the photoelectric conversion element opposing to each other onto the light reflecting surface. CONSTITUTION:Several light reflecting surfaces 2 are formed from the center toward the outer circumference on the upper surface of turntable 1 by sticking the aluminum foil or the like, and light emitting elements 11a, 11b and 11c plus corresponding photoelectric conversion elements 12a, 12b and 12c are provided at the upper part of table 1 and opposing to surface 2. Thus the photoelectric conversion element detects the light which is emitted from the light emitting element and reflected on surface 2 when table 1 is turning. In this case, the different photoelectric conversion elements receive the light according to the presence and the size of the record disk on table 1. And the state of the record disk is detected by giving operation to the output given from each element, and thus the position of pickup arm is controlled.
JP9484778A 1978-08-02 1978-08-02 Record disk detecting device Pending JPS5522265A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9484778A JPS5522265A (en) 1978-08-02 1978-08-02 Record disk detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9484778A JPS5522265A (en) 1978-08-02 1978-08-02 Record disk detecting device

Publications (1)

Publication Number Publication Date
JPS5522265A true JPS5522265A (en) 1980-02-16

Family

ID=14121415

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9484778A Pending JPS5522265A (en) 1978-08-02 1978-08-02 Record disk detecting device

Country Status (1)

Country Link
JP (1) JPS5522265A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51124414A (en) * 1975-04-22 1976-10-29 Mitsubishi Electric Corp Protective apparatus for magnetic sheet

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51124414A (en) * 1975-04-22 1976-10-29 Mitsubishi Electric Corp Protective apparatus for magnetic sheet

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