JPS63214916A - Glide tester for magnetic disk - Google Patents

Glide tester for magnetic disk

Info

Publication number
JPS63214916A
JPS63214916A JP4839587A JP4839587A JPS63214916A JP S63214916 A JPS63214916 A JP S63214916A JP 4839587 A JP4839587 A JP 4839587A JP 4839587 A JP4839587 A JP 4839587A JP S63214916 A JPS63214916 A JP S63214916A
Authority
JP
Japan
Prior art keywords
projection
sensors
projections
circuit
detecting
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.)
Granted
Application number
JP4839587A
Other languages
Japanese (ja)
Other versions
JPH07105041B2 (en
Inventor
Hiroshi Mizusawa
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.)
Hitachi High Tech Corp
Original Assignee
Hitachi Electronics Engineering Co 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 Hitachi Electronics Engineering Co Ltd filed Critical Hitachi Electronics Engineering Co Ltd
Priority to JP4839587A priority Critical patent/JPH07105041B2/en
Publication of JPS63214916A publication Critical patent/JPS63214916A/en
Publication of JPH07105041B2 publication Critical patent/JPH07105041B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To decrease the number of changing-over to varnishing and projection detecting operations by mounting 1st projection sensors for detecting the approximate value of the size of projections to a varnishing head and providing a projection detecting head having 2nd projection sensors which detect the residual projections with high accuracy after the operation for removing the projections. CONSTITUTION:Two pieces of the 1st projection sensors 3b'-1, 3b'-2 and two pieces of the 2nd projection sensors 3b-1, 3b-2 are respectively amplified by preamplifiers 14-1-14-4 and the sensors under working are selected by a selection circuit 15 in accordance with the instruction from a microcomputer 19 and are inputted via a main amplifier 16 and a band pass filter 17 to a projection detecting circuit 18. A threshold Vs is previously set at a terminal 18a of the circuit 18 and the detection voltage exceeding said value is outputted as significant. Noises are cut. The output signal of the circuit 18 is subjected to prescribed processing by the microcomputer 19. Since the state in which the projections are cut off occasionally can, therefore, be occasionally detected during the operation, the need for changing over the head is eliminated.
JP4839587A 1987-03-03 1987-03-03 Glide tester of magnetic disk Expired - Lifetime JPH07105041B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4839587A JPH07105041B2 (en) 1987-03-03 1987-03-03 Glide tester of magnetic disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4839587A JPH07105041B2 (en) 1987-03-03 1987-03-03 Glide tester of magnetic disk

Publications (2)

Publication Number Publication Date
JPS63214916A true JPS63214916A (en) 1988-09-07
JPH07105041B2 JPH07105041B2 (en) 1995-11-13

Family

ID=12802109

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4839587A Expired - Lifetime JPH07105041B2 (en) 1987-03-03 1987-03-03 Glide tester of magnetic disk

Country Status (1)

Country Link
JP (1) JPH07105041B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03230321A (en) * 1990-02-05 1991-10-14 Hitachi Ltd Adhesion measuring instrument
JPH03230320A (en) * 1990-02-05 1991-10-14 Fuji Electric Co Ltd Method for removing projection on disk surface of disk memory device
JP2006344312A (en) * 2005-06-09 2006-12-21 Fuji Electric Device Technology Co Ltd Projection inspection method of magnetic medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03230321A (en) * 1990-02-05 1991-10-14 Hitachi Ltd Adhesion measuring instrument
JPH03230320A (en) * 1990-02-05 1991-10-14 Fuji Electric Co Ltd Method for removing projection on disk surface of disk memory device
JP2006344312A (en) * 2005-06-09 2006-12-21 Fuji Electric Device Technology Co Ltd Projection inspection method of magnetic medium
JP4513655B2 (en) * 2005-06-09 2010-07-28 富士電機デバイステクノロジー株式会社 Method for inspecting magnetic medium protrusions

Also Published As

Publication number Publication date
JPH07105041B2 (en) 1995-11-13

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