JPS5671853A - Detection system of magnetic disc deformation - Google Patents
Detection system of magnetic disc deformationInfo
- Publication number
- JPS5671853A JPS5671853A JP14873079A JP14873079A JPS5671853A JP S5671853 A JPS5671853 A JP S5671853A JP 14873079 A JP14873079 A JP 14873079A JP 14873079 A JP14873079 A JP 14873079A JP S5671853 A JPS5671853 A JP S5671853A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disc
- control circuit
- signal
- linear motor
- deformation
- 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
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
- G11B19/20—Driving; Starting; Stopping; Control thereof
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
PURPOSE:To obtain the system which can surely and easily detect the deformation of a magnetic disc, by detecting the amount of light reaching to a photo detector from the light source, which is changed at the deformation of a magnetic disc. CONSTITUTION:If a magnetic disc 1 has deformation, a part of light emitted from the light source 2 is interferred for the path at the magnetic disc, and the amount of light reaching a photo sensor 3 is reduced. The level detection circuit 4 detects it, and when the amount of this change reaches a given value, a signal is delivered to a linear motor control circuit 6 via a device control circuit 5. When this signal is delivered at the start of the magnetic disc, the linear motor control circuit 6 feeds a signal A to the linear motor for magnetic disc drive to inhibit the initial seek operation. Further, when the signal is fed during the rotation of magnetic disc, the linear motor control circuit 6 feeds a signal B to the linear motor for head retract and the control circuit 5 for the device performs unsafe display C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14873079A JPS5671853A (en) | 1979-11-16 | 1979-11-16 | Detection system of magnetic disc deformation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14873079A JPS5671853A (en) | 1979-11-16 | 1979-11-16 | Detection system of magnetic disc deformation |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5671853A true JPS5671853A (en) | 1981-06-15 |
Family
ID=15459317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14873079A Pending JPS5671853A (en) | 1979-11-16 | 1979-11-16 | Detection system of magnetic disc deformation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5671853A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8708183B2 (en) | 2011-05-10 | 2014-04-29 | Channell Commercial Corporation | Lid-lift hole liner and containment box for utility vault lids |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5222529A (en) * | 1975-08-13 | 1977-02-19 | Nickel Le | Electrodeposition process for ferroonickel alloy |
-
1979
- 1979-11-16 JP JP14873079A patent/JPS5671853A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5222529A (en) * | 1975-08-13 | 1977-02-19 | Nickel Le | Electrodeposition process for ferroonickel alloy |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8708183B2 (en) | 2011-05-10 | 2014-04-29 | Channell Commercial Corporation | Lid-lift hole liner and containment box for utility vault lids |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS56129191A (en) | Printer | |
JPS5465536A (en) | Ink jet recorder | |
JPS5652132A (en) | Control system for feeding | |
JPS6449915A (en) | Shaft run-out insensitive type optical rotary encoder | |
GB1435443A (en) | Detecting mechanism for detecting a missing or displaced film end portion of a film magazine | |
JPS5671853A (en) | Detection system of magnetic disc deformation | |
JPS578072A (en) | Detection of use limit of grinding wheel of grinder | |
GB1529880A (en) | Loading of magnetic tape unit | |
JPS57103870A (en) | Checking method for type wheel | |
JPS5654359A (en) | Abnormality detecting method in vehicle speed measurement | |
JPS5271070A (en) | Apparatus for detecting elongation of conveyor | |
JPS5633975A (en) | Feeding mechanism of ink ribbon | |
JPS5619558A (en) | Information recording and reproducing unit of disc shape | |
JPS5621920A (en) | Driving-asleep operation detector | |
JPS5746352A (en) | Disk device | |
JPS57123561A (en) | Auto loading control system | |
JPS57210359A (en) | Transfer sheet size detector of copying machine | |
JPS5774863A (en) | Record player | |
JPS5736482A (en) | Position controller for signal pickup | |
JPS5658181A (en) | Dial turn control unit | |
JPS5537667A (en) | Stop position controller | |
JPS59220471A (en) | Position detector for car character line | |
JPS57109951A (en) | Loop detector of photographic printer | |
JPS51123901A (en) | Detector device for detecting clogging of plunger pump | |
JPS6459665A (en) | Optical disk device |