JPS56124174A - Magnetic disc device - Google Patents
Magnetic disc deviceInfo
- Publication number
- JPS56124174A JPS56124174A JP2655480A JP2655480A JPS56124174A JP S56124174 A JPS56124174 A JP S56124174A JP 2655480 A JP2655480 A JP 2655480A JP 2655480 A JP2655480 A JP 2655480A JP S56124174 A JPS56124174 A JP S56124174A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- disc pack
- shaft
- output
- reliability
- 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
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
PURPOSE: To obtain a high-reliability and inexpensive disc pack detecting mechanism, by providing a sensor plate which is moved upward to link with the sensor and detects rotating state of the disc pack due to a notch part when the disc pack is mounted.
CONSTITUTION: When disc pack 5 is not fitted to shaft 7 of spindle 1, shaft 7 is moved downward (to the position indicated by the broken line), and the photo transistor of sensor 14 receives the light of the light emitting diode because sensor plate 12 is not linked to sensor 14, and sensor 14 generates the output. When the disc pack is mounted, sensor plate 12 of shaft 7 is linked to sensor 14, and notch 12a does not exist in the position of sensor 14, and therefore, sensor 14 does not generate the output. When disc pack 5 is rotated and becomes the acceleration state, the period of output pulses of sensor becomes shorter according to rotation of notch part 12a, and thus, it is detected that the disc pack reaches the steady state. As a result, a high-reliability and inexpensive disc pack detecting mechanism is obtained.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2655480A JPS56124174A (en) | 1980-03-05 | 1980-03-05 | Magnetic disc device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2655480A JPS56124174A (en) | 1980-03-05 | 1980-03-05 | Magnetic disc device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56124174A true JPS56124174A (en) | 1981-09-29 |
Family
ID=12196739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2655480A Pending JPS56124174A (en) | 1980-03-05 | 1980-03-05 | Magnetic disc device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56124174A (en) |
-
1980
- 1980-03-05 JP JP2655480A patent/JPS56124174A/en active Pending
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