US1844705A - Piezo-electric apparatus - Google Patents
Piezo-electric apparatus Download PDFInfo
- Publication number
- US1844705A US1844705A US274347A US27434728A US1844705A US 1844705 A US1844705 A US 1844705A US 274347 A US274347 A US 274347A US 27434728 A US27434728 A US 27434728A US 1844705 A US1844705 A US 1844705A
- Authority
- US
- United States
- Prior art keywords
- piezo
- electrode
- floating electrode
- adjusting member
- electric apparatus
- 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 - Lifetime
Links
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 241001585751 Paenibacillus phage Tripp Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 241001527902 Aratus Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders or supports
- H03H9/09—Elastic or damping supports
Definitions
- My invention relates to piezo-electric apparatus, and has for its principal object the provision of an improved piezo-electric cell which is so constructed as to permit ready assembly and accurate adjustment of its various parts.
- a piezo-electric element such as a crystal of quartz or the like, will oscillate at a frequency dependent on its mechanical dimensions when it is subjected to an electrostatic field and that this characteristic of the piezo-electric element may be utilized to predetermine very accurately the frequency at which current is supplied from a source to an output circuit.
- the electrodes through which the electro-static field is applied to the active surfaces of the element be capable of accurate adjustment with respect to one another. In making this adjustment, the element may be subjected to a compressive force applied through the electrodes or may rest upon one of the electrodes and be slightly spaced from the other.
- the drawing illustrates a piezo-electric ap paratus constructed in accordance with my invention.
- This apparatus includes a piezoelectric element 1 which is interposed between an adjustable electrode 2 and a floating electrode 8. This element is surrounded at its outer edges by an insulation collar 4, and is protected from variations in temperature by an insulation cover 5 mounted on an insula- 18%8. Setialflo. 274,3".
- tion base 6 Potential is applied to the adjustable electrode 2 through a terminal 8 and a threaded support 9 and to the floating electrode 3 through a terminal 7, a threaded pedestal 10, an adjusting member '11 threaded into the pedestal 10 and a bolt 12 or a spiral spring 13 which surrounds the bolt 12 and is interposed between the adjusting member 11 and the electrode 3. 7
- the adjustable mechanical coupling between the electrodes 2 and 3 includes the member 9, the base 6, the pcdestal lO, the adjusting member 11, the bolt 12 and the spring 13.
- the floating electrode 3, the spring 13, the bolt 1:? and the threaded plug or adjusting member 11 are arranged to form a unit assembly which may be adjusted readily to apply any desired pressure to the active surfaces of the element 1.
- the proper adjust- 5 meat of the electrode 2 is preferably made by first screwing it down until the floating electrode 3 is clamped against the top of the pedestal 10 by pressure exerted through the element 1 and then unscrewing the electrode i 2 slightly so as to free the floating electrode 3 and leave it pressed against the element 1 by a pressure dependent on the adjustment of the unit assembly formed by the members 3, 11, 12 and 13.
- the maintenance of the electrodes in contact with the active surfaces of the piezo-electric element has the advantage that change in output due to temperature variations is largely avoided. This advantage is most marked in the case of very thin elements.
- the floating electrode 3 and the element 1 are prevented from lateral displacement by the insulation barrier 4 which closely fits the upper periphery of the pedestal 10 and keeps the element 1 between the electrodes 2 and 3. It has been found that a piezoelectric cell of this construction can be roughly treated without damage and can be satisfactorily used in any desired position.
- a unit assembly including a floating electrode, an adjusting member, a member fixed to said hand this 28th floating electrode and extending through said adjusting member, and a spiral spring interposed between said adjusting member and said floating electrode.
- a unit assembly includi'ng a floating electrode, an adjusting member, a pin fixed to said electrode and extending through said adjusting member, and a spiral spring surrounding said pin and extending between said floating electrode and said adjusting member.
- a unit assembly including a floating electrode, an adjustable electrode spaced from said floating electrode for forming a crystal chamber, a spring arranged to support said floating electrode and means comprising a pair of threaded members for ad- 7 justing the position of said spring.
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
Febl9, 1932- A. B. TRIPP PIEZO ELECTRIC APf'ARATUS Filed May 1. 1928 W by Mi His Attorney.
Patented Feb. 9, 1932 UNITED STATES PATENT OFFICE AUGUSTUS B. TRIPP, OF CLIFTONDALE, MASSACHUSETTS, ASSIGNOR T GENERAL ELEC- TRIO COMPANY, A CORPORATION OF NENV YORK PIEZO-ELECTRIC APPARATUS Application filed May 1,
My invention relates to piezo-electric apparatus, and has for its principal object the provision of an improved piezo-electric cell which is so constructed as to permit ready assembly and accurate adjustment of its various parts.
It is wellknown that a piezo-electric element, such as a crystal of quartz or the like, will oscillate at a frequency dependent on its mechanical dimensions when it is subjected to an electrostatic field and that this characteristic of the piezo-electric element may be utilized to predetermine very accurately the frequency at which current is supplied from a source to an output circuit. It is de sirable that the electrodes through which the electro-static field is applied to the active surfaces of the element be capable of accurate adjustment with respect to one another. In making this adjustment, the element may be subjected to a compressive force applied through the electrodes or may rest upon one of the electrodes and be slightly spaced from the other. The latter arrangement has the advantage that oscillation of the element is readily initiated but has the disadvantage that the output is not so constant as it is when the element is subjected to slight pressure. In accordance with my invention, variation in the output is avoided by the provision of an improved cell including a resilient mechanical coupling which permits very accurate adjustment in the pressure applied to the active surfaces of the piezo-electric element.
My invention will be better understood from the following description when considered in connection with the accompanying drawing and its scope will be pointed out in the appended claims.
The drawing illustrates a piezo-electric ap paratus constructed in accordance with my invention.
This apparatus includes a piezoelectric element 1 which is interposed between an adjustable electrode 2 and a floating electrode 8. This element is surrounded at its outer edges by an insulation collar 4, and is protected from variations in temperature by an insulation cover 5 mounted on an insula- 18%8. Setialflo. 274,3".
tion base 6. Potential is applied to the adjustable electrode 2 through a terminal 8 and a threaded support 9 and to the floating electrode 3 through a terminal 7, a threaded pedestal 10, an adjusting member '11 threaded into the pedestal 10 and a bolt 12 or a spiral spring 13 which surrounds the bolt 12 and is interposed between the adjusting member 11 and the electrode 3. 7
With this construction, the adjustable mechanical coupling between the electrodes 2 and 3 includes the member 9, the base 6, the pcdestal lO, the adjusting member 11, the bolt 12 and the spring 13. A It should be noted that the floating electrode 3, the spring 13, the bolt 1:? and the threaded plug or adjusting member 11 are arranged to form a unit assembly which may be adjusted readily to apply any desired pressure to the active surfaces of the element 1. The proper adjust- 5 meat of the electrode 2 is preferably made by first screwing it down until the floating electrode 3 is clamped against the top of the pedestal 10 by pressure exerted through the element 1 and then unscrewing the electrode i 2 slightly so as to free the floating electrode 3 and leave it pressed against the element 1 by a pressure dependent on the adjustment of the unit assembly formed by the members 3, 11, 12 and 13. The maintenance of the electrodes in contact with the active surfaces of the piezo-electric element has the advantage that change in output due to temperature variations is largely avoided. This advantage is most marked in the case of very thin elements.
The floating electrode 3 and the element 1 are prevented from lateral displacement by the insulation barrier 4 which closely fits the upper periphery of the pedestal 10 and keeps the element 1 between the electrodes 2 and 3. It has been found that a piezoelectric cell of this construction can be roughly treated without damage and can be satisfactorily used in any desired position.
What I claim as new and desire to secure by Letters Patent of the United States, is
1. In a piezo-electric apparatus, a unit assembly including a floating electrode, an adjusting member, a member fixed to said hand this 28th floating electrode and extending through said adjusting member, and a spiral spring interposed between said adjusting member and said floating electrode.
2. In a piezo-electric apparatus, a unit assembly includi'ng a floating electrode, an adjusting member, a pin fixed to said electrode and extending through said adjusting member, and a spiral spring surrounding said pin and extending between said floating electrode and said adjusting member.
3. In a piezo electric apparatus, the combination of a unit assembly including a floating electrode, an adjustable electrode spaced from said floating electrode for forming a crystal chamber, a spring arranged to support said floating electrode and means comprising a pair of threaded members for ad- 7 justing the position of said spring.
4:; In a piezo electric apparatus, the combination of an adjustable electrode, a floating electrode spaced from said adjustable electrode for forming a crystal chamber, an adjusting member, and a spiral spring interposed between said floatlng electrode and said adjusting member. p
In witness whereof, I have hereunto set my day of April, 1928. AUGUSTUS B. TRIPP.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US274347A US1844705A (en) | 1928-05-01 | 1928-05-01 | Piezo-electric apparatus |
| FR36844D FR36844E (en) | 1928-05-01 | 1929-04-27 | Improvements to piezoelectric devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US274347A US1844705A (en) | 1928-05-01 | 1928-05-01 | Piezo-electric apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1844705A true US1844705A (en) | 1932-02-09 |
Family
ID=23047805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US274347A Expired - Lifetime US1844705A (en) | 1928-05-01 | 1928-05-01 | Piezo-electric apparatus |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1844705A (en) |
| FR (1) | FR36844E (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2431233A (en) * | 1944-04-21 | 1947-11-18 | Gen Motors Corp | Supersonic measuring means |
| US2454769A (en) * | 1942-01-23 | 1948-11-30 | Int Standard Electric Corp | Piezoelectric crystal support |
| US2457563A (en) * | 1944-04-10 | 1948-12-28 | Dan W Keller | Crystal mounting |
-
1928
- 1928-05-01 US US274347A patent/US1844705A/en not_active Expired - Lifetime
-
1929
- 1929-04-27 FR FR36844D patent/FR36844E/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2454769A (en) * | 1942-01-23 | 1948-11-30 | Int Standard Electric Corp | Piezoelectric crystal support |
| US2457563A (en) * | 1944-04-10 | 1948-12-28 | Dan W Keller | Crystal mounting |
| US2431233A (en) * | 1944-04-21 | 1947-11-18 | Gen Motors Corp | Supersonic measuring means |
Also Published As
| Publication number | Publication date |
|---|---|
| FR36844E (en) | 1930-09-20 |
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