GB749162A - Improvements in or relating to arrangements for scanning and reproducing magnetic fields - Google Patents
Improvements in or relating to arrangements for scanning and reproducing magnetic fieldsInfo
- Publication number
- GB749162A GB749162A GB16453/54A GB1645354A GB749162A GB 749162 A GB749162 A GB 749162A GB 16453/54 A GB16453/54 A GB 16453/54A GB 1645354 A GB1645354 A GB 1645354A GB 749162 A GB749162 A GB 749162A
- Authority
- GB
- United Kingdom
- Prior art keywords
- branches
- gap
- coils
- fluxes
- coil
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
- H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/335—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only with saturated jig, e.g. for detecting second harmonic; balanced flux head
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
749,162. Magnetic recording and reproducing heads. PHILIPS ELECTRICAL INDUSTRIES, Ltd. June 3, 1954 [June 6, 1953], No. 16453/54. Class 40(2) A magnetic head for scanning signals- and modulating same with a carrier A.C. for subsequent detection, has a magnet having a part comprising two parallel branches of a material with a non-linear polarization characterization and in which D.C. and the A.C. carrier is generated in such a manner that their effect is a null one at the gap, and output winding or windings on said branches imposing an equal load thereon. Fig. 2 illustrates one embodiment in which the parallel branches 4, 5 of the magnet carry coils a and b which carry A.C. from a source G and produce alternating fluxes of an intensity effecting non-linear polarization of the branches 4, 5, the direction of winding being such as to be in aiding relationship to each other but producing a null effect at the gap 3. At the same time, a D.C. bias is produced in the branches 4, 5 from a source V by coils f and g which are arranged in similar self-aiding relationship as with the coils a and b. Coils f and g may be dispensed with if an element of D.C. is introduced by way of source G. When a signal is received at the gap 3, an A.C. modulated signal may be taken from coil d by a grid 6 of a valve for amplification and thence to a circuit 10 tuned for subsequent detection. The amplification stage may be dispensed with if the coil e has an equal load imposed on it, for example, another detector, the two detected voltages being combined, if. required. Fig. 3 shows an embodiment enabling voltages induced by the fluxes to be directly detected. The branches 4, 5 are connected by a bridge 11 and coil h carrying the A.C. which thereby produces opposition fluxes in the gap 3. The branch windings k and l are connected to identical detector arrangements 12; 13 producing D.C. fluxes in the two parts of branch 4 which are equal in value but opposite in direction, thereby producing no D.C. flux in the gap 3 but imposing equal loads on the branches.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL749162X | 1953-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB749162A true GB749162A (en) | 1956-05-16 |
Family
ID=19822897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16453/54A Expired GB749162A (en) | 1953-06-06 | 1954-06-03 | Improvements in or relating to arrangements for scanning and reproducing magnetic fields |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1019098B (en) |
| FR (1) | FR1101937A (en) |
| GB (1) | GB749162A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4050012A (en) * | 1975-04-04 | 1977-09-20 | Flora James D | Dual biased static sensing magnetic transducer |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE558166A (en) * | 1956-06-08 | |||
| US3016427A (en) * | 1956-08-24 | 1962-01-09 | North American Aviation Inc | Saturable magnetic head |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2536260A (en) * | 1948-12-30 | 1951-01-02 | Rca Corp | Device for reproducing magnetic records |
-
1954
- 1954-06-02 DE DEN9007A patent/DE1019098B/en active Pending
- 1954-06-03 GB GB16453/54A patent/GB749162A/en not_active Expired
- 1954-06-04 FR FR1101937D patent/FR1101937A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4050012A (en) * | 1975-04-04 | 1977-09-20 | Flora James D | Dual biased static sensing magnetic transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1101937A (en) | 1955-10-12 |
| DE1019098B (en) | 1957-11-07 |
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