GB462888A - Improvements in or relating to electro-mechanical impedances - Google Patents
Improvements in or relating to electro-mechanical impedancesInfo
- Publication number
- GB462888A GB462888A GB24812/36A GB2481236A GB462888A GB 462888 A GB462888 A GB 462888A GB 24812/36 A GB24812/36 A GB 24812/36A GB 2481236 A GB2481236 A GB 2481236A GB 462888 A GB462888 A GB 462888A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- impedance
- vibration
- zero
- shaped
- 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
- 239000012528 membrane Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0095—Balance-unbalance or balance-balance networks using bulk acoustic wave devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/24—Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
- 462,888. Impedance networks. STANDARD TELEPHONES & CABLES, Ltd. Sept. 11, 1936, No. 24812. Convention date, Oct. 2, 1935. [Class 40 (iii)] According to one aspect of the invention, a two - terminal impedance element comprises a stretched wire 1, Fig. 1, between magnetic polepieces 2, 3, so shaped that the field diminishes sinusoidally from the centre outwards. The back E.M.F. generated. when the wire vibrates is then zero for harmonic vibrations, and the impedance element exhibits a " resonance " only at the fundamental mode of vibration. Alternatively, the polepieces may be plane and the wire extend by <1>/6 of its length beyond each end, Fig. 8 (not shown) ; the back E.M.F. generated for the 3rd harmonic mode of vibration is then zero. In a further modification, a stretched membrane 8, Fig. 4, is positioned between electrostatic electrodes 6, 7 shaped to give a field varying sinusoidally from the centre outwards. Impedance elements of this last type are indicated at 13, 13<1>, 14, 14<1>, Fig. 7, in a lattice type wave filter. U.S.A. Specification 1,828,454 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US43154A US2094062A (en) | 1935-10-02 | 1935-10-02 | Electromechanical impedance |
Publications (1)
Publication Number | Publication Date |
---|---|
GB462888A true GB462888A (en) | 1937-03-17 |
Family
ID=21925767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24812/36A Expired GB462888A (en) | 1935-10-02 | 1936-09-11 | Improvements in or relating to electro-mechanical impedances |
Country Status (5)
Country | Link |
---|---|
US (1) | US2094062A (en) |
DE (1) | DE745757C (en) |
FR (1) | FR816361A (en) |
GB (1) | GB462888A (en) |
NL (1) | NL47516C (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2958040A (en) * | 1958-02-10 | 1960-10-25 | J B T Instr Inc | Electrical frequency responsive device |
US3218846A (en) * | 1960-10-26 | 1965-11-23 | Chemetron Corp | Ultrasonic flaw testing apparatus |
US3164987A (en) * | 1961-03-28 | 1965-01-12 | Bosch Arma Corp | Electrostatic vibration transducer |
US3190129A (en) * | 1961-07-10 | 1965-06-22 | Bosch Arma Corp | Accelerometer and parts therefor |
US3465597A (en) * | 1965-05-25 | 1969-09-09 | Singer General Precision | Vibrating-column accelerometer |
WO2013091736A1 (en) * | 2011-12-23 | 2013-06-27 | L-3 Communications Magnet-Motor Gmbh | Permanent magnet excited electric machine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE494716C (en) * | 1927-07-08 | 1930-04-29 | Elektrotechnischer Trust Der S | Piezoelectric vibration generator |
GB344034A (en) * | 1929-11-28 | 1931-03-02 | James Robinson | Improvements in or relating to wireless receiving systems |
US1906250A (en) * | 1931-11-18 | 1933-05-02 | Union Switch & Signal Co | Electric filtering apparatus |
-
0
- NL NL47516D patent/NL47516C/xx active
-
1935
- 1935-10-02 US US43154A patent/US2094062A/en not_active Expired - Lifetime
-
1936
- 1936-09-11 GB GB24812/36A patent/GB462888A/en not_active Expired
- 1936-09-23 DE DEI55993D patent/DE745757C/en not_active Expired
- 1936-09-23 FR FR816361D patent/FR816361A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2094062A (en) | 1937-09-28 |
NL47516C (en) | |
FR816361A (en) | 1937-08-06 |
DE745757C (en) | 1944-05-22 |
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