GB582232A - Improvements in electromechanical delay devices - Google Patents
Improvements in electromechanical delay devicesInfo
- Publication number
- GB582232A GB582232A GB12546/44A GB1254644A GB582232A GB 582232 A GB582232 A GB 582232A GB 12546/44 A GB12546/44 A GB 12546/44A GB 1254644 A GB1254644 A GB 1254644A GB 582232 A GB582232 A GB 582232A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid
- crystals
- frequency
- cellulose acetate
- plastic
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/30—Time-delay networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/30—Time-delay networks
- H03H9/36—Time-delay networks with non-adjustable delay time
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Liquid Crystal Substances (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
582,232. Electromechanical delay lines. WESTERN ELECTRIC CO., Inc. June 30, 1944, No. 12546. Convention date, July 8, 1943. [Classes 40 (iii) and 40 (v)] A wide-band high-frequency delay line comprises an aperiodic liquid or solid medium for transmitting mechanical vibrations and is terminated by L-cut crystals which, Fig. 1 (not shown), have their faces equally inclined to the three crystallographic arcs in Rochelle salt and vibrate longitudinally, i.e. parallel to the applied electric field, with broad resonance. The transmission band is widened by using, at each end of the line, two or more such crystals having overlapping characteristics. A common transmission path may comprise a tube 16, Fig. 4, of metal, glass, plastic or the like containing a liquid such as xylene hexafluoride, in which vibrations travel with low velocity, in lieu of castor oil. At each end is a header 17 mounting two or more transducer units corresponding to different bands of frequency, each of which contains a crystal 21 supported on a plate 22 and backed by a steel resonator 23. In order to prevent reflection and interaction between adjacent units, each unit is provided with an attenuator comprising fine-mesh screens 20 and a damping liquid enclosed by a soft rubber diaphragm 19. The capacitance of the crystals is tuned out by inductances 24. A separate tube 16 may be provided for each frequency range, the attenuators being omitted. Instead of a liquid, the transmission medium may comprise a solid such as cellulose acetate butyrate or some of the polyesters, loaded with heavy particles of a metal such as permalloy or tungsten to reduce the velocity, Fig. 5 (not shown). High attenuation is secured at the terminal transducer units in this case by interposing a length of a plastic such as cellulose acetate between each transducer unit and the transmission medium.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US493856A US2421026A (en) | 1943-07-08 | 1943-07-08 | Delay device |
Publications (1)
Publication Number | Publication Date |
---|---|
GB582232A true GB582232A (en) | 1946-11-08 |
Family
ID=23961976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12546/44A Expired GB582232A (en) | 1943-07-08 | 1944-06-30 | Improvements in electromechanical delay devices |
Country Status (2)
Country | Link |
---|---|
US (1) | US2421026A (en) |
GB (1) | GB582232A (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2659080A (en) * | 1945-08-01 | 1953-11-10 | Adalbert E Benfield | Self-synchronous moving target indication system |
US2559905A (en) * | 1945-09-29 | 1951-07-10 | Raytheon Mfg Co | Electric impulse handling system |
US2522389A (en) * | 1946-03-16 | 1950-09-12 | Bell Telephone Labor Inc | Electric power source |
US2577500A (en) * | 1946-04-02 | 1951-12-04 | David L Arenberg | Absorbing means for delay lines |
US2702885A (en) * | 1946-04-17 | 1955-02-22 | Shapiro Herbert | Supersonic delay line |
BE475404A (en) * | 1946-08-16 | |||
US2490452A (en) * | 1946-08-16 | 1949-12-06 | Bell Telephone Labor Inc | Generation of transverse vibrations in liquids |
US2990515A (en) * | 1946-12-13 | 1961-06-27 | Philco Corp | Multiple signal delay device |
GB688120A (en) * | 1947-10-31 | 1953-02-25 | John Presper Eckert | Data storage system |
US2685067A (en) * | 1948-03-12 | 1954-07-27 | Raytheon Mfg Co | Means for delaying electrical signals |
US2663006A (en) * | 1948-11-19 | 1953-12-15 | Crystal Res Lab Inc | Crystal mounting for delay lines |
US2727214A (en) * | 1949-11-02 | 1955-12-13 | Bell Telephone Labor Inc | Acoustic delay line using solid rods |
US2707755A (en) * | 1950-07-20 | 1955-05-03 | Sperry Prod Inc | High absorption backings for ultrasonic crystals |
US2688121A (en) * | 1951-11-03 | 1954-08-31 | Andersen Lab Inc | Ultrasonic delay line |
US2736823A (en) * | 1952-03-31 | 1956-02-28 | Sperry Rand Corp | Acoustic transducer and damping assembly |
US2754481A (en) * | 1952-08-09 | 1956-07-10 | Hazeltine Research Inc | Electrostrictive time-delay signaltranslating device |
US3048815A (en) * | 1952-11-05 | 1962-08-07 | Edward G Thurston | Low frequency transducer |
US2861247A (en) * | 1954-04-30 | 1958-11-18 | Bell Telephone Labor Inc | Low loss, broad band, ultrasonic transmission systems |
US2826745A (en) * | 1956-08-05 | 1958-03-11 | Irving H Page | Grid-type liquid delay line |
US3178681A (en) * | 1960-01-07 | 1965-04-13 | Rayflex Exploration Company | Hydrophone |
US3174120A (en) * | 1960-04-18 | 1965-03-16 | Corning Glass Works | Ultrasonic delay line having means to reduce third-time echo |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1111463A (en) * | 1905-09-15 | 1914-09-22 | Lovell Mcconnell Mfg Co | Horn and similar instrument. |
GB357957A (en) * | 1930-06-19 | 1931-09-21 | Standard Telephones Cables Ltd | Improvements in or relating to wave signalling systems |
US1981999A (en) * | 1932-08-20 | 1934-11-27 | American Telephone & Telegraph | Optical telephone system |
US2104811A (en) * | 1935-03-21 | 1938-01-11 | Rca Corp | Variable acoustical reverberation system |
FR820425A (en) * | 1936-07-18 | 1937-11-10 | Materiel Telephonique | Electromagnetic wave selection systems, for example |
GB509040A (en) * | 1937-10-06 | 1939-07-06 | James Robinson | Improvements in electrical frequency selective circuits |
US2263902A (en) * | 1938-02-08 | 1941-11-25 | Emi Ltd | Delay device for use in transmission of oscillations |
FR846812A (en) * | 1938-06-01 | 1939-09-26 | Csf | Improvements to sound and ultrasonic signaling devices with a directive effect |
-
1943
- 1943-07-08 US US493856A patent/US2421026A/en not_active Expired - Lifetime
-
1944
- 1944-06-30 GB GB12546/44A patent/GB582232A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2421026A (en) | 1947-05-27 |
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