[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JPS5782258A - Magnetic disc device - Google Patents

Magnetic disc device

Info

Publication number
JPS5782258A
JPS5782258A JP15536280A JP15536280A JPS5782258A JP S5782258 A JPS5782258 A JP S5782258A JP 15536280 A JP15536280 A JP 15536280A JP 15536280 A JP15536280 A JP 15536280A JP S5782258 A JPS5782258 A JP S5782258A
Authority
JP
Japan
Prior art keywords
dust
shroud
meter
digital signal
scattering
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
JP15536280A
Other languages
Japanese (ja)
Inventor
Shoji Ishida
Kenichi Ito
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15536280A priority Critical patent/JPS5782258A/en
Publication of JPS5782258A publication Critical patent/JPS5782258A/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
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs

Abstract

PURPOSE:To prevent head crash in advance, by providing a means detecting compared density of dust in a shroud. CONSTITUTION:An optional control module 20 of a linear motor operated with a digital signal from an optical digital dust meter 10, and the said meter are provided. That is, the light axis of a projector 11 of the optical digital dust meter 10 such as transmitting light measuring photoelectric photometry and scattered light meansurement photoelectric photometry and the light axis of a photodetector are transmitted in parallel with the external line of one gap under a disc pack 5 to be built in a shroud 3. Even if a slight scattering of minute dust is present in the shroud 3, the number of digital signal counts changes with the chabge in the scattering, allowing to detect so-called compared density.
JP15536280A 1980-11-05 1980-11-05 Magnetic disc device Pending JPS5782258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15536280A JPS5782258A (en) 1980-11-05 1980-11-05 Magnetic disc device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15536280A JPS5782258A (en) 1980-11-05 1980-11-05 Magnetic disc device

Publications (1)

Publication Number Publication Date
JPS5782258A true JPS5782258A (en) 1982-05-22

Family

ID=15604248

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15536280A Pending JPS5782258A (en) 1980-11-05 1980-11-05 Magnetic disc device

Country Status (1)

Country Link
JP (1) JPS5782258A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214483A (en) * 1984-04-11 1985-10-26 Matsushita Electric Ind Co Ltd Magnetic recording and reproducing device
JPS6271083A (en) * 1985-09-25 1987-04-01 Hitachi Ltd Magnetic disc device
JPS62154394A (en) * 1985-12-27 1987-07-09 Mitsubishi Electric Corp Storage device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214483A (en) * 1984-04-11 1985-10-26 Matsushita Electric Ind Co Ltd Magnetic recording and reproducing device
JPS6271083A (en) * 1985-09-25 1987-04-01 Hitachi Ltd Magnetic disc device
JPS62154394A (en) * 1985-12-27 1987-07-09 Mitsubishi Electric Corp Storage device

Similar Documents

Publication Publication Date Title
JPS55154439A (en) Method and apparatus for measuring moisture content of paper
JPS5782258A (en) Magnetic disc device
JPS5639554A (en) Original density measuring method
JPS5722511A (en) Pulse encoder
TW264538B (en)
JPS5750606A (en) Solar sensor
JPS5666713A (en) Measuring device of beam diameter of laser light
JPS5462879A (en) Optical temperature detector
JPS57143764A (en) Head position detector
JPS56129830A (en) Pressure measuring apparatus
JPS56111403A (en) Sensor for parallel luminous flux photodetection
JPS56168502A (en) Film thickness gauge utilizing infrared ray
SU577555A1 (en) Photoelectric tape speed sensor
JPS5498260A (en) Position indicator
JPS57181434A (en) Position detector for head in disc storage device
JPS54100705A (en) Servo control mechanism for tape recorder
JPS56130856A (en) Program search device for record player
JPS5723844A (en) Method and apparatus for measuring light scattering removed of influence of unnecessary scattered light in solution
JPS576342A (en) Detector for state of road surface
JPS5722537A (en) Device for measuring amount of water content in paper and rate of water content and the like
JPS57111406A (en) Detector for optical inclination
JPS6466639A (en) Device for detecting size of original
JPS52149132A (en) Heat sensitive type signal recording system
JPS56118376A (en) Optical sensor array device
JPS5468203A (en) Detecting system of light reflecting face positions