JPS6491076A - Measuring apparatus for magnetic recording medium - Google Patents
Measuring apparatus for magnetic recording mediumInfo
- Publication number
- JPS6491076A JPS6491076A JP24784887A JP24784887A JPS6491076A JP S6491076 A JPS6491076 A JP S6491076A JP 24784887 A JP24784887 A JP 24784887A JP 24784887 A JP24784887 A JP 24784887A JP S6491076 A JPS6491076 A JP S6491076A
- Authority
- JP
- Japan
- Prior art keywords
- image
- taken
- medium
- camera
- transfer plate
- 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
Links
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
PURPOSE:To measure the position and attitude of a signal recorded on a medium at a high accuracy, by providing an image processing section to pick up an image of a recording signal taken with an image sensor several times as multilevel image for addition or subtraction. CONSTITUTION:A magnetic transfer plate 2 is brought in close contact with a magnetic recording medium 1 as object to be measured to transfer the state of magnetization of a signal recorded on the medium 1. In an optical system 3, light from a light source 3b is linearly polarized with a polarizer 3c to be incident into the transfer plate 2 via a half mirror 3d and an objective lens 3e. The reflected light from the transfer plate 2 turns in the polarization plane and is transmitted through an analyzer 3f to be taken with a TV camera 3a. An image brought into the camera 3a is inputted into an image processing section 4 and image data taken in several times are processed for addition and subtraction to remove noise of an image taken with the camera 3a. The image data processed undergoes a computation processing with a computer 5 thereby enabling highly accurate measurement of the position and attitude of a signal on the medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62247848A JPH0774821B2 (en) | 1987-10-02 | 1987-10-02 | Measuring method of magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62247848A JPH0774821B2 (en) | 1987-10-02 | 1987-10-02 | Measuring method of magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6491076A true JPS6491076A (en) | 1989-04-10 |
JPH0774821B2 JPH0774821B2 (en) | 1995-08-09 |
Family
ID=17169561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62247848A Expired - Lifetime JPH0774821B2 (en) | 1987-10-02 | 1987-10-02 | Measuring method of magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0774821B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5565772A (en) * | 1994-11-30 | 1996-10-15 | Eastman Kodak Company | High sensitivity magnetic viewer using anhysteretic transfer for viewing weak magnetic patterns |
US5750449A (en) * | 1993-06-14 | 1998-05-12 | Sumitomo Electric Industries, Ltd. | Ceramic porous bodies and method of producing the same |
US7206112B2 (en) | 2002-10-01 | 2007-04-17 | Pioneer Corporation | Image display device and manufacuring method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5350777A (en) * | 1976-10-19 | 1978-05-09 | Kokusai Denshin Denwa Co Ltd | Magnetic field distribution measuring device |
JPS56124064A (en) * | 1980-03-05 | 1981-09-29 | Ricoh Co Ltd | Floating magnetic field measurement |
JPS5930075A (en) * | 1982-08-12 | 1984-02-17 | Nippon Hoso Kyokai <Nhk> | Apparatus for observing magnetic domain |
JPS61256237A (en) * | 1985-05-09 | 1986-11-13 | Dainippon Printing Co Ltd | Defect inspection for cyclic pattern |
JPS62102103A (en) * | 1985-10-30 | 1987-05-12 | Hitachi Ltd | Measuring instrument for fine magnetized pattern |
JPS62201335A (en) * | 1986-02-28 | 1987-09-05 | Dainippon Printing Co Ltd | Speckle inspecting method for periodic pattern |
-
1987
- 1987-10-02 JP JP62247848A patent/JPH0774821B2/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5350777A (en) * | 1976-10-19 | 1978-05-09 | Kokusai Denshin Denwa Co Ltd | Magnetic field distribution measuring device |
JPS56124064A (en) * | 1980-03-05 | 1981-09-29 | Ricoh Co Ltd | Floating magnetic field measurement |
JPS5930075A (en) * | 1982-08-12 | 1984-02-17 | Nippon Hoso Kyokai <Nhk> | Apparatus for observing magnetic domain |
JPS61256237A (en) * | 1985-05-09 | 1986-11-13 | Dainippon Printing Co Ltd | Defect inspection for cyclic pattern |
JPS62102103A (en) * | 1985-10-30 | 1987-05-12 | Hitachi Ltd | Measuring instrument for fine magnetized pattern |
JPS62201335A (en) * | 1986-02-28 | 1987-09-05 | Dainippon Printing Co Ltd | Speckle inspecting method for periodic pattern |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5750449A (en) * | 1993-06-14 | 1998-05-12 | Sumitomo Electric Industries, Ltd. | Ceramic porous bodies and method of producing the same |
US5565772A (en) * | 1994-11-30 | 1996-10-15 | Eastman Kodak Company | High sensitivity magnetic viewer using anhysteretic transfer for viewing weak magnetic patterns |
US7206112B2 (en) | 2002-10-01 | 2007-04-17 | Pioneer Corporation | Image display device and manufacuring method |
Also Published As
Publication number | Publication date |
---|---|
JPH0774821B2 (en) | 1995-08-09 |
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