US4628285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-terminal oscillating element and oscillator employing the same
Assignee: Murata Manufacturing Co Ltd
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Filing: 1984-12-27
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Granted: 1986-12-09
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Expires: 2004-12-27
Abstract
Abstract A 3-terminal oscillating element has a square plate-like piezoelectric body, first and second electrodes provided on one surface of the piezoelectric body and a common electrode provided on the other surface of the piezoelectric body. The piezoelectric body is polarized in one direction between the first and common electrodes and in the opposite direction between the second and common electrode. The 3-terminal oscillating element, when provided in place of a combination of 2-terminal oscillating element and two externally provided capacitors C 1 and C 2 in a Colpitts circuit, substantially satisfies the following equations: ##EQU1## wherein C 01 is an electrostatic capacitance between the first electrode and the counter electrode, C 02 is an electrostatic capacitance between the second electrode and the counter electrode, and n is an transformation ratio of an ideal transformer; and ##EQU2## wherein S 1 and S 2 are areas of first and second electrodes, respectively.
Inventors
- 👤 Hiroshi Nakatani
- 👤 Jiro Inoue
- 👤 Masashige Miyamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:26
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/323
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
268 words
A 3-terminal oscillating element (CR 2 ) provided in place of a combination of 2-terminal oscillating element (CR 1 ) and two externally provided capacitors (C 1 and C 2 ) in a Colpitts circuit, wherein the first external capacitor (C 1 ) is connected to the input side of an amplifier of said Colpitts circuit and the second external capacitor (C 2 ) is connected to the output side of said amplifier, said 3-terminal oscillating element (CR 2 ) having: a piezoelectric body (1) having first and second surfaces in face-to-face relation to each other, said piezoelectric body having a central section pre-polarized in one direction between said first and second surfaces and a perimeter section pre-polarized in the opposite direction to said one direction; a first electrode (2) provided on the first surface over said central section of the piezoelectric body; a second electrode (3) provided on the first surface, in a spaced relation to said first electrode (2) and over said perimeter section of the piezoelectric body (1); and a counter electrode (4) provided on said second surface covering both said first and second sections of said piezoelectric body, said 3-terminal oscillating element (CR 2 ) characterized in that: the following equations are substantially satisfied: ##EQU14## wherein C 01 is an electrostatic capacitance between the first electrode (2) and the counter electrode (4), C 02 is an electrostatic capacitance between the second electrode (3) and the counter electrode (4), and n is an transformation ratio of an ideal transformer; and ##EQU15## wherein S 1 and S 2 are areas of first and second electrodes, respectively.
Claim 2
Dependent Claim
268 words
A 3-terminal oscillating element (CR 2 ) provided in place of a combination of 2-terminal oscillating element (CR 1 ) and two externally provided capacitors (C 1 and C 2 ) in a Colpitts circuit, wherein the first external capacitor (C 1 ) is connected to the input side of an amplifier of said Colpitts circuit and the second external capacitor (C 2 ) is connected to the output side of said amplifier, said 3-terminal oscillating element (CR 2 ) having: a piezoelectric body (1) having first and second surfaces in face-to-face relation to each other, said piezoelectric body having a central section pre-polarized in one direction between said first and second surfaces and a perimeter section pre-polarized in the opposite direction to said one direction; a first electrode (2) provided on the first surface over said central section of the piezoelectric body; a second electrode (3) provided on the first surface, in a spaced relation to said first electrode (2) and over said perimeter section of the piezoelectric body (1); and a counter electrode (4) provided on said second surface covering both said first and second sections of said piezoelectric body, said 3-terminal oscillating element (CR 2 ) characterized in that: the following equations are substantially satisfied: ##EQU14## wherein C 01 is an electrostatic capacitance between the first electrode (2) and the counter electrode (4), C 02 is an electrostatic capacitance between the second electrode (3) and the counter electrode (4), and n is an transformation ratio of an ideal transformer; and ##EQU15## wherein S 1 and S 2 are areas of first and second electrodes, respectively.
Claim 3
Dependent Claim
49 words
A 3-terminal oscillating element as claimed in claim 1, wherein said second electrode is connected to an output terminal, which is connected to said output side of said amplifier, and said first electrode is connected to an input terminal, which is connected to said input side of said amplifier.
Claim 4
Dependent Claim
13 words
A 3-terminal oscillating element as claimed in claim 1, characterized in that: ##EQU16##
Claim 5
Dependent Claim
285 words
An oscillator comprising: a 3-terminal oscillating element (CR 2 ) provided in place of a combination of 2-terminal oscillating element (CR 1 ) and two externally provided capacitors (C 1 and C 2 ) in a Colpitts circuit, wherein the first external capacitor (C 1 ) is connected to the input side of an amplifier of said Colpitts circuit and the second external capacitor (C 2 ) is connected to the output side of said amplifier, said 3-terminal oscillating element (CR 2 ) having: a piezoelectric body (1) having first and second surfaces in face-to-face relation to each other, said piezoelectric body having a perimeter section pre-polarized in one direction between said first and second surfaces and a central section pre-polarized in the opposite direction to said one direction; a first electrode (2) provided on the first surface over said perimeter section of the piezoelectric body; a second electrode (3) provided on the first surface, in a spaced relation to said first electrode (2) and over said central section of the piezoelectric body (1); and a counter electrode (4) provided on said second surface covering both said first and second sections of said piezoelectric body, said 3-terminal oscillating element (CR 2 ) satisfying the following equations: ##EQU17## wherein C 01 is an electrostatic capacitance between the first electrode (2) and the counter electrode (4), C 02 is an electrostatic capacitance between the second electrode (3) and the counter electrode (4), and n is an transformation ratio of an ideal transformer; and ##EQU18## wherein S 1 and S 2 are areas of first and second electrodes, respectively; and said amplifier having its output connected to said first electrode and its input connected to said second electrode.
Claim 6
Dependent Claim
285 words
An oscillator comprising: a 3-terminal oscillating element (CR 2 ) provided in place of a combination of 2-terminal oscillating element (CR 1 ) and two externally provided capacitors (C 1 and C 2 ) in a Colpitts circuit, wherein the first external capacitor (C 1 ) is connected to the input side of an amplifier of said Colpitts circuit and the second external capacitor (C 2 ) is connected to the output side of said amplifier, said 3-terminal oscillating element (CR 2 ) having: a piezoelectric body (1) having first and second surfaces in face-to-face relation to each other, said piezoelectric body having a perimeter section pre-polarized in one direction between said first and second surfaces and a central section pre-polarized in the opposite direction to said one direction; a first electrode (2) provided on the first surface over said perimeter section of the piezoelectric body; a second electrode (3) provided on the first surface, in a spaced relation to said first electrode (2) and over said central section of the piezoelectric body (1); and a counter electrode (4) provided on said second surface covering both said first and second sections of said piezoelectric body, said 3-terminal oscillating element (CR 2 ) satisfying the following equations: ##EQU17## wherein C 01 is an electrostatic capacitance between the first electrode (2) and the counter electrode (4), C 02 is an electrostatic capacitance between the second electrode (3) and the counter electrode (4), and n is an transformation ratio of an ideal transformer; and ##EQU18## wherein S 1 and S 2 are areas of first and second electrodes, respectively; and said amplifier having its output connected to said first electrode and its input connected to said second electrode.
Claim 7
Independent Claim
288 words
A method of manufacturing a 3-terminal oscillating element (CR 2 ) provided in place of a combination of 2-terminal oscillating element (CR 1 ) and two externally provided capacitors (C 1 and C 2 ) in a Colpitts circuit, wherein the first external capacitor (C 1 ) is connected to the input side of an amplifier of said Colpitts circuit and the second external capacitor (C 2 ) is connected to the output side of said amplifier, said 3-terminal oscillating element (CR 2 ) having: a piezoelectric body (1) having first and second surfaces in face-to-face relation to each other, said piezoelectric body having a perimeter section pre-polarized in one direction between said first and second surfaces and a central section pre-polarized in the opposite direction to said one direction; a first electrode (2) provided on the first surface over said perimeter section of the piezoelectric body; a second electrode (3) provided on the first surface, in a spaced relation to said first electrode (2) and over said central section of the piezoelectric body (1); and a counter electrode (4) provided on said second surface covering both said first and second sections of said piezoelectric body, said method comprising the steps of: measuring a capacitance ratio C 2 /C 1 ; and preparing said 3-terminal oscillating element (CR 2 ) so as to substantially satisfy the following equations: ##EQU19## wherein C 01 is an electrostatic capacitance between the first electrode (2) and the counter electrode (4), C 02 is an electrostatic capacitance between the second electrode (3) and the counter electrode (4), and n is an transformation ratio of an ideal transformer; and ##EQU20## wherein S 1 and S 2 are areas of first and second electrodes, respectively.
Claim 8
Independent Claim
288 words
A method of manufacturing a 3-terminal oscillating element (CR 2 ) provided in place of a combination of 2-terminal oscillating element (CR 1 ) and two externally provided capacitors (C 1 and C 2 ) in a Colpitts circuit, wherein the first external capacitor (C 1 ) is connected to the input side of an amplifier of said Colpitts circuit and the second external capacitor (C 2 ) is connected to the output side of said amplifier, said 3-terminal oscillating element (CR 2 ) having: a piezoelectric body (1) having first and second surfaces in face-to-face relation to each other, said piezoelectric body having a perimeter section pre-polarized in one direction between said first and second surfaces and a central section pre-polarized in the opposite direction to said one direction; a first electrode (2) provided on the first surface over said perimeter section of the piezoelectric body; a second electrode (3) provided on the first surface, in a spaced relation to said first electrode (2) and over said central section of the piezoelectric body (1); and a counter electrode (4) provided on said second surface covering both said first and second sections of said piezoelectric body, said method comprising the steps of: measuring a capacitance ratio C 2 /C 1 ; and preparing said 3-terminal oscillating element (CR 2 ) so as to substantially satisfy the following equations: ##EQU19## wherein C 01 is an electrostatic capacitance between the first electrode (2) and the counter electrode (4), C 02 is an electrostatic capacitance between the second electrode (3) and the counter electrode (4), and n is an transformation ratio of an ideal transformer; and ##EQU20## wherein S 1 and S 2 are areas of first and second electrodes, respectively.
References Cited (Backward Citations)
US4336510A
Cited
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