GB535507A - Piezo-electric devices - Google Patents
Piezo-electric devicesInfo
- Publication number
- GB535507A GB535507A GB5556/40A GB555640A GB535507A GB 535507 A GB535507 A GB 535507A GB 5556/40 A GB5556/40 A GB 5556/40A GB 555640 A GB555640 A GB 555640A GB 535507 A GB535507 A GB 535507A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piezo
- plates
- electric
- shows
- curie point
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
- G02B26/04—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light by periodically varying the intensity of light, e.g. using choppers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
535,507. Piezo-electric crystals telephone instruments. ELECTRICAL RESEARCH PRODUCTS, Inc. March 28, 1940, No. 5556. Convention date, April 5, 1939. [Classes 40 (iii)] and 40 (v)] [Also in Groups XXXVI and XXXIX] A piezo-electric device comprises two or more superposed plates of piezo-electric material, each provided with electrodes and clamped together so as to vibrate as a unit, one or more of the plates consisting of a material having a different Curie point from the other plate or plates. The arrangement is designed to give efficient working over a considerable temperature range and three substances for use in combination are sodium potassium tartrate, sodium potassium tartrate crystallised from heavy water this having a higher Curie point, and sodium rubidium tartrate having a lower Curie point. The plates may be mounted so as to produce longitudinal vibration or to produce warping. Fig. 6 shows an electromechanical wave filter in which circuits 10, 11 are coupled to a longitudinally vibrating bar 12 by means of piezo-electric units 13, 14 each comprising six plates arranged to expand or -contract simultaneously, and consisting of materials having different Curie points. Fig. 7 shows a stack of plates arranged to produce bending and provided with a mirror 19 which, in conjunction with a light source, serves as a light valve or oscillograph. Fig. 9 shows a telephone receiver in which a square piezo-electric element 25 is clamped across one diagonal by a bar 24, the bending of the other diagonal serving to operate a diaphragm 22 through blocks 26, 27. The diaphragm is held between the two halves of a moulded casing by a metal ring 23.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US535507XA | 1939-04-05 | 1939-04-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB535507A true GB535507A (en) | 1941-04-10 |
Family
ID=21985049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5556/40A Expired GB535507A (en) | 1939-04-05 | 1940-03-28 | Piezo-electric devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB535507A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2480446A1 (en) * | 1980-04-15 | 1981-10-16 | Kernforschungsanlage Juelich | DEVICE FOR MODULATING THE OPTICAL TRANSMISSION OF A RADIATION BEAM AND USE THEREOF IN GAS ANALYSIS APPARATUS |
-
1940
- 1940-03-28 GB GB5556/40A patent/GB535507A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2480446A1 (en) * | 1980-04-15 | 1981-10-16 | Kernforschungsanlage Juelich | DEVICE FOR MODULATING THE OPTICAL TRANSMISSION OF A RADIATION BEAM AND USE THEREOF IN GAS ANALYSIS APPARATUS |
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