GB322033A - Improvements in or relating to the recording and reproduction of sound - Google Patents

Improvements in or relating to the recording and reproduction of sound

Info

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
Application number
GB2717028A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB2717028A priority Critical patent/GB322033A/en
Publication of GB322033A publication Critical patent/GB322033A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012Recording 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.
GB2717028A 1928-09-21 1928-09-21 Improvements in or relating to the recording and reproduction of sound Expired GB322033A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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