JPS57137841A - Measuring method of film strength - Google Patents

Measuring method of film strength

Info

Publication number
JPS57137841A
JPS57137841A JP56023804A JP2380481A JPS57137841A JP S57137841 A JPS57137841 A JP S57137841A JP 56023804 A JP56023804 A JP 56023804A JP 2380481 A JP2380481 A JP 2380481A JP S57137841 A JPS57137841 A JP S57137841A
Authority
JP
Japan
Prior art keywords
head
magnetic
output
film
disk
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
JP56023804A
Other languages
Japanese (ja)
Inventor
Tadatoshi Suenaga
Mitsuru Hamada
Seiya Ogawa
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 JP56023804A priority Critical patent/JPS57137841A/en
Publication of JPS57137841A publication Critical patent/JPS57137841A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/56—Investigating resistance to wear or abrasion

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Magnetic Variables (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE:To evaluate the strength of a coated film quantitatively and automatically by recording an information signal for measurement on the film and regenerating continuously by a reproducing head, in an abrasion resistance test for a film of a magnetic recording medium. CONSTITUTION:An information signal for measurement is recorded on a magnetic coated film 2 on the surface of a magnetic disk 1, and a magnetic head 4 repeats operations of stop and start-up. Signal which is outputted from the head 4 is inputted to an analog comparator 9 and a threshold value setting circuit 10 through a preamplifier 8. A detector for rotatinal frequency 11' is provided to a revolving plate 18 equipped to a rotating shaft of the disk 1, and its output is inputted to a gate 11 and operation signal is outputted only in the time when the disk 1 is stationarily rotating. When the output from the head 4 becomes smaller than the input signal to the coated film 2 in a certain degree, the comparator 9 stops the output of a counter 12 and a motor 17 is stopped and then the test is finished.
JP56023804A 1981-02-20 1981-02-20 Measuring method of film strength Pending JPS57137841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56023804A JPS57137841A (en) 1981-02-20 1981-02-20 Measuring method of film strength

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56023804A JPS57137841A (en) 1981-02-20 1981-02-20 Measuring method of film strength

Publications (1)

Publication Number Publication Date
JPS57137841A true JPS57137841A (en) 1982-08-25

Family

ID=12120508

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56023804A Pending JPS57137841A (en) 1981-02-20 1981-02-20 Measuring method of film strength

Country Status (1)

Country Link
JP (1) JPS57137841A (en)

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