JPS57105858A - Preventing device for misdetection of disc diameter for player - Google Patents
Preventing device for misdetection of disc diameter for playerInfo
- 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
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
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5477103A (en) * | 1977-12-01 | 1979-06-20 | Aiwa Co | Fully automatic record player |
-
1980
- 1980-12-24 JP JP18213980A patent/JPS57105858A/en active Pending
Patent Citations (1)
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)
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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