GB1018550A - Improved parametric reproducing head - Google Patents
Improved parametric reproducing headInfo
- Publication number
- GB1018550A GB1018550A GB2058864A GB2058864A GB1018550A GB 1018550 A GB1018550 A GB 1018550A GB 2058864 A GB2058864 A GB 2058864A GB 2058864 A GB2058864 A GB 2058864A GB 1018550 A GB1018550 A GB 1018550A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parametric
- magnetic
- insulation
- pump
- stripes
- 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
- 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
-
- 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
- G11B5/332—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using thin films
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F7/00—Parametric amplifiers
- H03F7/02—Parametric amplifiers using variable-inductance element; using variable-permeability element
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Magnetic Heads (AREA)
Abstract
1,018,550. Magnetic playback heads. AMPEX CORPORATION. May 19, 1964 [Sept. 5, 1963], No. 20588/64. Heading G5R. [Also in Division H3] A parametric playback head comprises a pair of magnetic polepieces 11, 12 (Fig. 1) positioned to form a gap for sensing flux in an adjacent magnetic medium 15, such as a tape or a drum, and a magnetic flux sensitive parametric amplifier device 17 is positioned in series with the magnetic circuit of the polepieces, for example in a back gap as shown. The device 17 is fed from a source 30 with a pumping signal which preferably has a frequency eight times the maximum input frequency recorded on the tape 15, for example 80 Mc/s., and the output winding 36 is tuned to half the pump frequency to suppress the pump signal. The head can read information such as digital signals from the medium 15 whilst the latter is stationary. Parametric devices.-Fig. 3 shows a plan view of the parametric device 17 which comprises a glass or like substrate 20 on which diagonal conducting stripes 38 are applied and coated with insulation. A permalloy film 41 is deposited over the insulation and annealed to have a preferred direction of magnetization parallel to one side of the device. An insulating coating is applied over the film, followed by an output winding 35, further insulation, and upper stripes 47 which connect to the lower stripes 38 to form the pump winding.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US30676363A | 1963-09-05 | 1963-09-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1018550A true GB1018550A (en) | 1966-01-26 |
Family
ID=23186725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2058864A Expired GB1018550A (en) | 1963-09-05 | 1964-05-19 | Improved parametric reproducing head |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1449704A1 (en) |
GB (1) | GB1018550A (en) |
NL (1) | NL6407580A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2209154A1 (en) * | 1972-07-03 | 1974-06-28 | Inf Ci Interna | |
GB2126819A (en) * | 1982-09-01 | 1984-03-28 | Clarion Co Ltd | Parametric amplifier |
-
1964
- 1964-05-19 GB GB2058864A patent/GB1018550A/en not_active Expired
- 1964-07-03 NL NL6407580A patent/NL6407580A/xx unknown
- 1964-07-16 DE DE19641449704 patent/DE1449704A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2209154A1 (en) * | 1972-07-03 | 1974-06-28 | Inf Ci Interna | |
GB2126819A (en) * | 1982-09-01 | 1984-03-28 | Clarion Co Ltd | Parametric amplifier |
Also Published As
Publication number | Publication date |
---|---|
NL6407580A (en) | 1965-03-08 |
DE1449704A1 (en) | 1968-12-19 |
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