GB665461A - Magnetic recording and reproducing - Google Patents
Magnetic recording and reproducingInfo
- Publication number
- GB665461A GB665461A GB18398/48A GB1839848A GB665461A GB 665461 A GB665461 A GB 665461A GB 18398/48 A GB18398/48 A GB 18398/48A GB 1839848 A GB1839848 A GB 1839848A GB 665461 A GB665461 A GB 665461A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paper
- july
- transducer
- iron oxide
- per cent
- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/62—Maintaining desired spacing between record carrier and head
-
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
-
- 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
- G11B5/10—Structure or manufacture of housings or shields for heads
-
- 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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/21—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features the pole pieces being of ferrous sheet metal or other magnetic layers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paints Or Removers (AREA)
- Credit Cards Or The Like (AREA)
Abstract
665,461. Magnetic recording and reproducing apparatus. BRUSH DEVELOPMENT CO. July 8, 1948. [July 21, 1947] No. 18398/48. Class 40 (ii). [Also in Groups VIII and XXXV] In a magnetic transducing apparatus, A.C. bias is employed, having a frequency of at least twice the highest frequency to be recorded and a record track material is used of interfelted fibre or paper less than about 3 mils thick containing a permanently magnetizable iron oxide powder having a particle size of 1 micron or less, the distribution of the particles in the surface adjacent to the pole pieces of the transducer being about 6 per cent to about 25 per cent by volume. The powdered magnetic iron oxide may be mixed with a slurry of papermaking fibres, preferably Kraft, containing bonding agents, such as polymerized resins, ethylenes, vinyl compounds, cellulose, casein, rubber latex, gum, starch, &c., and smoothed as by calendering by pressing between polished and heated rollers in such a manner that an element of slippage between the rollers is produced which is effective for densifying and levelling the surface of the paper. Details are given of various processes of manufacture of the paper. The tape which is slightly wider than the guide structure 2-26, Fig. 7 of the transducer is guided over the pole pieces 2-21 by guide walls 2-31, and may be provided with coloured coatings or labels to indicate parts of the record, or the coating may include a layer of electrically conducting substance for controlling a starting or stopping operation. Specifications 647,962, 670,573 and 676,761 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US665461XA | 1947-07-21 | 1947-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB665461A true GB665461A (en) | 1952-01-23 |
Family
ID=22070190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18398/48A Expired GB665461A (en) | 1947-07-21 | 1948-07-08 | Magnetic recording and reproducing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB665461A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0018267A1 (en) * | 1979-04-11 | 1980-10-29 | EASTMAN KODAK COMPANY (a New Jersey corporation) | Magnetic recording method and apparatus |
-
1948
- 1948-07-08 GB GB18398/48A patent/GB665461A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0018267A1 (en) * | 1979-04-11 | 1980-10-29 | EASTMAN KODAK COMPANY (a New Jersey corporation) | Magnetic recording method and apparatus |
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