GB429987A - Improvements in or relating to sound recording and reproduction devices - Google Patents
Improvements in or relating to sound recording and reproduction devicesInfo
- Publication number
- GB429987A GB429987A GB36166/34A GB3616634A GB429987A GB 429987 A GB429987 A GB 429987A GB 36166/34 A GB36166/34 A GB 36166/34A GB 3616634 A GB3616634 A GB 3616634A GB 429987 A GB429987 A GB 429987A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- winding
- magnet
- carrier
- ring
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
429,987. Telegraphones. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London. Dec. 17, 1934, No. 36166. Convention date, Dec. 23, 1933. [Class 40 (ii)] Leakage is reduced to a minimum in a magnetic sound recording or reproducing head by employ. ing a laminated sheet iron or compressed iron powder ring-shaped core 4 having an air gap 3 filled with insulating material, the core being surrounded by an audio current winding 5 which may also be supplied with direct current to bring the working point to a favourable position on the hysteresis loop. For cancelling and premagnetizing, a ring shaped permanent magnet 1 having an air gap 3 may also be provided as shown. According to a modification, Fig. 3, (not shown), a ring-shaped magnet may be provided on the other side of the carrier 2 and opposite the core 4 in which case the D.C. in winding 5 serves only for accurately regulating the working point determined by such magnet. Alternatively, the magnet may be provided with an adjustable magnetic shunt in which case no direct current is supplied to winding 5. If desired, a separate core carrying the D.C. winding may be arranged on the other side of the carrier opposite core 4, Fig. 2, (not shown). According to further modifications, the core is surrounded by a screen of magnetic material, preferably a highly permeable substance, Fig. 4, (not shown), or the winding 5 may be arranged on the side of the core at which the carrier runs on, Fig. 5, (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE429987X | 1933-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB429987A true GB429987A (en) | 1935-06-11 |
Family
ID=6477685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36166/34A Expired GB429987A (en) | 1933-12-23 | 1934-12-17 | Improvements in or relating to sound recording and reproduction devices |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR782755A (en) |
GB (1) | GB429987A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2538405A (en) * | 1948-04-27 | 1951-01-16 | Armour Res Found | Electromagnetic transducer head assembly |
US2563445A (en) * | 1951-08-07 | Mount for magnetic transducing | ||
US2585932A (en) * | 1948-07-29 | 1952-02-19 | Magnetic Equipment Inc | Device for reducing noise in magnetic recording systems |
US2632816A (en) * | 1951-03-26 | 1953-03-24 | Stromberg Carlson Co | Magnetic recording and reproducing head |
US2754569A (en) * | 1952-10-21 | 1956-07-17 | Clevite Corp | Method of making a magnetic transducer head |
US2917589A (en) * | 1955-01-07 | 1959-12-15 | Clevite Corp | High efficiency magnetic recording and reproducing head |
US2987583A (en) * | 1955-09-07 | 1961-06-06 | Armour Res Found | Magnetic transducer head |
US3230517A (en) * | 1962-09-24 | 1966-01-18 | Ibm | External field magnetic head |
-
1934
- 1934-12-15 FR FR782755D patent/FR782755A/en not_active Expired
- 1934-12-17 GB GB36166/34A patent/GB429987A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563445A (en) * | 1951-08-07 | Mount for magnetic transducing | ||
US2538405A (en) * | 1948-04-27 | 1951-01-16 | Armour Res Found | Electromagnetic transducer head assembly |
US2585932A (en) * | 1948-07-29 | 1952-02-19 | Magnetic Equipment Inc | Device for reducing noise in magnetic recording systems |
US2632816A (en) * | 1951-03-26 | 1953-03-24 | Stromberg Carlson Co | Magnetic recording and reproducing head |
US2754569A (en) * | 1952-10-21 | 1956-07-17 | Clevite Corp | Method of making a magnetic transducer head |
US2917589A (en) * | 1955-01-07 | 1959-12-15 | Clevite Corp | High efficiency magnetic recording and reproducing head |
US2987583A (en) * | 1955-09-07 | 1961-06-06 | Armour Res Found | Magnetic transducer head |
US3230517A (en) * | 1962-09-24 | 1966-01-18 | Ibm | External field magnetic head |
Also Published As
Publication number | Publication date |
---|---|
FR782755A (en) | 1935-06-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB429987A (en) | Improvements in or relating to sound recording and reproduction devices | |
GB1460744A (en) | Loud speakers of the moving coil type | |
GB672465A (en) | Permanent magnet structure for a loudspeaker | |
GB445935A (en) | An improved sound reproducing device | |
GB495171A (en) | Improvements in deaf-aids for use in cinema auditoriums or the like | |
GB672467A (en) | Improvements in and relating to sound reproducing devices | |
GB943321A (en) | Improvements in earphones | |
GB341531A (en) | Loud speakers | |
GB709287A (en) | Improvements in or relating to magnetic heads for magnetic sound recording apparatusemploying high-frequency bias | |
GB306044A (en) | Improvements in and relating to sound reproducing apparatus | |
GB447846A (en) | Improvements in and relating to moving-coil loud speakers | |
GB547082A (en) | Improvements in sound receiving apparatus | |
GB456573A (en) | Improvements in and relating to magnetic sound recording apparatus | |
GB669458A (en) | An improved core for electro-magnets | |
GB746537A (en) | Improvements in or relating to magnetic transducer heads | |
GB324994A (en) | Improvements relating to recording and reproducing sound | |
GB377141A (en) | Improvements in or relating to electrodynamic loudspeakers | |
JPS5325419A (en) | Speaker | |
GB798930A (en) | Improvements in and relating to broad band magnetic tape reproduction systems | |
GB635868A (en) | Improvements in or relating to gramophone records | |
GB474898A (en) | Improvements relating to apparatus for use in the recording and reproduction of sound | |
GB394857A (en) | Improvements in electro-dynamic speakers | |
GB392524A (en) | Improvements in and relating to sound reproducing devices | |
GB423807A (en) | Improvements in or relating to sound reproducing devices | |
GB664140A (en) | Improvements in magnetic phonographs |