GB1267434A - Apparatus and method of testing a magnetic recording medium - Google Patents
Apparatus and method of testing a magnetic recording mediumInfo
- Publication number
- GB1267434A GB1267434A GB5028569A GB5028569A GB1267434A GB 1267434 A GB1267434 A GB 1267434A GB 5028569 A GB5028569 A GB 5028569A GB 5028569 A GB5028569 A GB 5028569A GB 1267434 A GB1267434 A GB 1267434A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- magnetic
- flux pattern
- winding
- resulting
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1207—Testing individual magnetic storage devices, e.g. records carriers or digital storage elements
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
1,267,434. Magnetic flaw testing. INTERNATIONAL BUSINESS MACHINES CORP. Oct.14, 1969 [Oct.16, 1968], No.50285/69. Heading G1N. Magnetic recording tape is tested for flaws by saturating it in one direction, then magnetizing it below saturation in the opposite direction, and detecting any inconsistencies in the resulting recorded flux pattern. As shown in Fig.9, head 120 produces a magnetic field which decreases in the thickness of the magnetic coating 112 of the tape so that the resulting flux pattern varies as shown by arrows VWXYZ. Pick-up head 124 detects any inconsistency in the resulting flux pattern due to a hole, Fig. 15D, or a bump, Fig. 16D. The detector winding 128, which may be centre-tapped to give a differential output, is preferably connected to an integrator having a frequency/gain characteristic complementary to that of the detector head so that the overall response is linear. In an alternative arrangement, Figs.1-8 (not shown), a common winding (34) Fig.4 (not shown) may serve as a bias and sense winding, means (40) being provided to adjust the bias field.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76801468A | 1968-10-16 | 1968-10-16 | |
| US76809268A | 1968-10-16 | 1968-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1267434A true GB1267434A (en) | 1972-03-22 |
Family
ID=27117998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5028569A Expired GB1267434A (en) | 1968-10-16 | 1969-10-14 | Apparatus and method of testing a magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1267434A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000295A (en) * | 1977-06-10 | 1979-01-04 | Basf Ag | Method and device for determining the homogeneity of a magnetic dispersion and method of manufacturing a magnetic recording medium from such a dispersion |
| WO1987005112A1 (en) * | 1986-02-17 | 1987-08-27 | Julius Hartai | Method and apparatus for non-destructive materials testing and magnetostructural materials investigations |
| EP0297922A2 (en) * | 1987-07-02 | 1989-01-04 | Seagate Technology, Inc. | Non-destructive method for magnetic measurements of recording disc members |
-
1969
- 1969-10-14 GB GB5028569A patent/GB1267434A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000295A (en) * | 1977-06-10 | 1979-01-04 | Basf Ag | Method and device for determining the homogeneity of a magnetic dispersion and method of manufacturing a magnetic recording medium from such a dispersion |
| GB2000295B (en) * | 1977-06-10 | 1982-03-10 | Basf Ag | Method and device for determining the homogeneity of a magnetic dispersion and method of manufacturing a magnetic recording medium from such a dispersion |
| WO1987005112A1 (en) * | 1986-02-17 | 1987-08-27 | Julius Hartai | Method and apparatus for non-destructive materials testing and magnetostructural materials investigations |
| US4931730A (en) * | 1986-02-17 | 1990-06-05 | Dam Patent A/S | Method and apparatus for non-destructive materials testing and magnetostructural materials investigations |
| EP0297922A2 (en) * | 1987-07-02 | 1989-01-04 | Seagate Technology, Inc. | Non-destructive method for magnetic measurements of recording disc members |
| EP0297922A3 (en) * | 1987-07-02 | 1990-10-10 | Seagate Technology, Inc. | Non-destructive method for magnetic measurements of recording disc members |
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