JPS57105858A - Preventing device for misdetection of disc diameter for player - Google Patents

Preventing device for misdetection of disc diameter for player

Info

Publication number
JPS57105858A
JPS57105858A JP18213980A JP18213980A JPS57105858A JP S57105858 A JPS57105858 A JP S57105858A JP 18213980 A JP18213980 A JP 18213980A JP 18213980 A JP18213980 A JP 18213980A JP S57105858 A JPS57105858 A JP S57105858A
Authority
JP
Japan
Prior art keywords
disc diameter
slit plate
stylus
arm
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
JP18213980A
Other languages
Japanese (ja)
Inventor
Atsushi Takeuchi
Hideo Goto
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP18213980A priority Critical patent/JPS57105858A/en
Publication of JPS57105858A publication Critical patent/JPS57105858A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent a stylus from slip-off outside of a disc, by detecting that the stylus is slightly at inside than the disc diameter.
CONSTITUTION: A slit plate 11 in interlocking with a rotating shaft 3 of a tone arm 1 is fitted to the shaft 3, and upper and lower parts of the slit plate 11 are provided with a photo coupler consisting of a light emitting diode D2 and a photo transistor P-TR2. The slit plate 11 and the photo coupler constitute an arm position detector 12. The arm position detector detects the position of the tone arm corresponding to the disc diameter. That is, the slit plate 11 has slits 1117, 1125, 1130 at positions with angles respectively corresponding to inner position somewhat from the disc diameter from the center of a turn table 9, for example, and when the stylus 10 at the tip of the tone arm 1 reaches respective position on the turn table 9, the light of the diode D2 is incident to the photo transistor P-TR via either one of the slits 1117, 1125, 1130.
COPYRIGHT: (C)1982,JPO&Japio
JP18213980A 1980-12-24 1980-12-24 Preventing device for misdetection of disc diameter for player Pending JPS57105858A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18213980A JPS57105858A (en) 1980-12-24 1980-12-24 Preventing device for misdetection of disc diameter for player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18213980A JPS57105858A (en) 1980-12-24 1980-12-24 Preventing device for misdetection of disc diameter for player

Publications (1)

Publication Number Publication Date
JPS57105858A true JPS57105858A (en) 1982-07-01

Family

ID=16113020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18213980A Pending JPS57105858A (en) 1980-12-24 1980-12-24 Preventing device for misdetection of disc diameter for player

Country Status (1)

Country Link
JP (1) JPS57105858A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424978A2 (en) * 1986-12-02 1991-05-02 Mitsubishi Denki Kabushiki Kaisha Optical disk drive device and information storage device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5477103A (en) * 1977-12-01 1979-06-20 Aiwa Co Fully automatic record player

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5477103A (en) * 1977-12-01 1979-06-20 Aiwa Co Fully automatic record player

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424978A2 (en) * 1986-12-02 1991-05-02 Mitsubishi Denki Kabushiki Kaisha Optical disk drive device and information storage device

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