GB554789A - Rochelle salt piezoelectric crystal apparatus - Google Patents
Rochelle salt piezoelectric crystal apparatusInfo
- Publication number
- GB554789A GB554789A GB9960/42A GB996042A GB554789A GB 554789 A GB554789 A GB 554789A GB 9960/42 A GB9960/42 A GB 9960/42A GB 996042 A GB996042 A GB 996042A GB 554789 A GB554789 A GB 554789A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- electrodes
- flexural
- length
- modes
- 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
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02157—Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
-
- 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
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
554,789. Piezo-electric crystals. STANDARD TELEPHONES & CABLES, Ltd. July 17, 1942, No. 9960. Convention date, May 22, 1941. [Classes 40 (iii) and 40 (v)] A rectangular Rochelle salt crystal element is cut with its major plane at right-angles to the X or Y axis of the natural crystal and the length dimension is at an acute angle to the other two axes, the crystal being provided with sets of electrodes which give uncoupled resonances in a flexural and an extensional mode, the ratio of width to length being between .05 and .5. Fig. 1 shows an X cut plate 1 of Rochelle salt with the major length dimension at an angle of 49 degrees 561 to the Y axis. In this position the longitudinal flexural vibrations depending on the ratio W/L of width to length and the extensional vibrations depending on length are uncoupled to any other modes. When energised by electrodes 10 ... 13 connected as shown in Fig. 5 the second flexural and fundamental extensional modes are excited and may be used simultaneously in a filter circuit such as those described in Specifications 531,662, 542,452, and 553,457. A similar Y-cut crystal is shown, also electrode arrangements, for a second harmonic flexural mode using four pairs of electrodes, with means for varying the relative impedances associated with the two modes of vibration by altering the position and angle of the line of division between the two pairs of electrodes on each crystal face. The crystal may be mounted by suspension or clamping at the nodal points. Specifications 532,925, 533,204 and 554,788 also are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US554789XA | 1941-05-22 | 1941-05-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB554789A true GB554789A (en) | 1943-07-19 |
Family
ID=21998104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9960/42A Expired GB554789A (en) | 1941-05-22 | 1942-07-17 | Rochelle salt piezoelectric crystal apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB554789A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2635199A (en) * | 1948-01-08 | 1953-04-14 | John M Wolfskill | Piezoelectric crystal apparatus |
US5075651A (en) * | 1990-02-15 | 1991-12-24 | Motorola, Inc. | VHF wide-bandwidth low impedance monolithic crystal filter having bridged electrodes |
-
1942
- 1942-07-17 GB GB9960/42A patent/GB554789A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2635199A (en) * | 1948-01-08 | 1953-04-14 | John M Wolfskill | Piezoelectric crystal apparatus |
US5075651A (en) * | 1990-02-15 | 1991-12-24 | Motorola, Inc. | VHF wide-bandwidth low impedance monolithic crystal filter having bridged electrodes |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1028102A (en) | Piezoelectric crystal elements | |
GB2006520A (en) | Piezo-electric resonator | |
FR1341963A (en) | Electromechanical crystal filter, vibration shear in thickness | |
GB554789A (en) | Rochelle salt piezoelectric crystal apparatus | |
GB720702A (en) | Piezoelectric crystal resonator support | |
GB634775A (en) | Improvement in piezoelectric crystal means and method of using same | |
GB553050A (en) | Piezoelectric crystal elements | |
GB553121A (en) | Piezoelectric crystal apparatus | |
FR2411508B1 (en) | QUARTZ RESONATOR | |
GB555400A (en) | Piezoelectric crystal apparatus | |
US2292388A (en) | Rochelle salt piezoelectric crystal apparatus | |
US1977169A (en) | Piezo-electric system | |
GB554963A (en) | Rochelle salt piezoelectric crystal apparatus | |
GB1073963A (en) | Improvements in or relating to electromechanical oscillators | |
GB554788A (en) | Rochelle salt piezoelectric crystal apparatus | |
GB553457A (en) | Piezoelectric crystal apparatus | |
GB549594A (en) | Piezoelectric crystal apparatus | |
GB554787A (en) | Rochelle salt piezoelectric crystal apparatus | |
GB548157A (en) | Piezoelectric crystal apparatus | |
GB641471A (en) | Piezoelectric crystal elements | |
GB1028134A (en) | Improvements relating to piezoelectric crystal resonators | |
GB552835A (en) | Piezoelectric crystal apparatus | |
GB568468A (en) | Improvements in and relating to piezo-electric crystals | |
GB474701A (en) | Improvements in or relating to piezo-electric crystals | |
GB679575A (en) | Improvements in or relating to piezo-electric crystal plates |