GB322033A - Improvements in or relating to the recording and reproduction of sound - Google Patents
Improvements in or relating to the recording and reproduction of soundInfo
- Publication number
- GB322033A GB322033A GB2717028A GB2717028A GB322033A GB 322033 A GB322033 A GB 322033A GB 2717028 A GB2717028 A GB 2717028A GB 2717028 A GB2717028 A GB 2717028A GB 322033 A GB322033 A GB 322033A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- electromagnet
- blank
- over
- ridge
- 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
- G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
Landscapes
- Toys (AREA)
Abstract
322,033. Brown, S. G. Sept. 21, 1928. Records ; magnetic apparatus.-A sound record is formed by guiding an electromagnet A immediately over a ridge b<1> in the form of a spiral or other uninterrupted path provided on the surface of an unmagnetized blank B of permanently magnetizable material, and a current which varies in accordance with the sounds to be recorded is passed through the coils of the electromagnet. The electromagnet A, which has a pole a, may be carried on the end of an arm C similar to a gramophone tone-arm, and in the construction shown in Fig. 2, two pins D are adapted to run in adjacent convolutions in the spiral groove b and guide the electromagnet during rotation of the disc b. A horse-shoe magnet may be employed in conjunction with a blank having two parallel spiral ridges b<1>, b<2>, Fig. 3, the magnet being arranged to have one pole over each ridge. If desired, two magnets may be provided in connection with a single disc, one being arranged above and the other below the disc. The end of the electromagnet A may be shielded by a copper disc E, Fig. 4, which is carried pivotally in the forked end of the arm C by means of two screws C<1> projecting into the ends of a recess e<3> in the edge of the disc E. The pole a of the electromagnet projects through a central hole e of the disc E and lies over the ridge in the blank B. The undersurface of the disc E is provided with grooves corresponding to the spiral grooves b in the blank for the purpose of guiding the copper disc over its surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2717028A GB322033A (en) | 1928-09-21 | 1928-09-21 | Improvements in or relating to the recording and reproduction of sound |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2717028A GB322033A (en) | 1928-09-21 | 1928-09-21 | Improvements in or relating to the recording and reproduction of sound |
Publications (1)
Publication Number | Publication Date |
---|---|
GB322033A true GB322033A (en) | 1929-11-28 |
Family
ID=10255330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2717028A Expired GB322033A (en) | 1928-09-21 | 1928-09-21 | Improvements in or relating to the recording and reproduction of sound |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB322033A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2428701A (en) * | 1945-02-02 | 1947-10-07 | Wolgen Co | Magnetic head |
US2431541A (en) * | 1945-05-31 | 1947-11-25 | Armour Res Found | Magnetic recording head |
US2537657A (en) * | 1945-05-05 | 1951-01-09 | Western Union Telegraph Co | Disk type magnetic recordingreproducing apparatus |
US2621259A (en) * | 1949-06-29 | 1952-12-09 | Rca Corp | Magnetic transducer |
-
1928
- 1928-09-21 GB GB2717028A patent/GB322033A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2428701A (en) * | 1945-02-02 | 1947-10-07 | Wolgen Co | Magnetic head |
US2537657A (en) * | 1945-05-05 | 1951-01-09 | Western Union Telegraph Co | Disk type magnetic recordingreproducing apparatus |
US2431541A (en) * | 1945-05-31 | 1947-11-25 | Armour Res Found | Magnetic recording head |
US2621259A (en) * | 1949-06-29 | 1952-12-09 | Rca Corp | Magnetic transducer |
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