JP4054575B2 - Support structure of piezoelectric vibrator - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a support structure for a piezoelectric element plate in a piezoelectric vibrator having two metal terminals.
[0002]
[Prior art]
With the rapid growth of the mobile communication market in recent years, the demand for communication devices has increased dramatically. As a result, piezoelectric vibrators used as a source of frequency as a reference in communication devices are used in the surrounding environment. However, there is a demand for ensuring a more stable operation of the specified frequency output even under severer conditions.
[0003]
Accordingly, there is a need for a piezoelectric vibrator that can maintain more stable characteristics under vibration conditions that are actually in operation, as well as frequency stability that is a reference against external stress such as impact resistance. However, a piezoelectric vibrator having a shape having two external metal terminals hermetically penetrating the metal base has an instability that the frequency fluctuates when an external impact or stress is applied due to its structure.
[0004]
In addition, when manufacturing a piezoelectric vibrator having this shape, the weld pressure deforms the metal base during welding, and the stress associated with the deformation is retained inside the piezoelectric vibrator through the metal terminal and the support. There is a problem that the specified frequency changes to the board.
[Problems to be solved by the invention]
[0005]
The problem to be solved by the present invention is that each of the metal terminals (leads) is held by a support branch fixed to a metal base inside the piezoelectric vibrator, thereby being resistant to external vibrations and impacts and during welding. To provide a support structure for a piezoelectric vibrator having a stable frequency by greatly reducing the stress applied to the piezoelectric element plate.
[0006]
[Means for Solving the Problems]
In addition to vibration and impact applied from the outside, the weld pressure applied to the metal base during the welding process during the manufacture of the piezoelectric vibrator deforms the metal base, and the stress accompanying the deformation penetrates the metal base in an airtight manner. Eliminates the problem that the oscillation frequency changes from the specified value through two metal terminals and the support provided between the metal terminals and the piezoelectric element plate, and is transmitted to the piezoelectric element plate inside the piezoelectric vibrator. In addition to the conventional support structure of the piezoelectric element plate, a support branch is further added so that the vibration resistance and impact resistance applied from the outside of the piezoelectric vibrator are enhanced and the piezoelectric vibrator maintains a stable frequency. It is provided inside the piezoelectric vibrator so as to serve as a buffer for absorbing external stress.
[0007]
[Embodiments of the Invention]
Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same objects.
[0008]
FIG. 1 is a front perspective view of a support structure for a piezoelectric vibrator according to the present invention. The piezoelectric element plate 1 is held in a vertical direction by a metal terminal 5 and a support branch 6 according to the present invention through a support 7. The support branch 6 protrudes from the metal base 3, and the tip of the support branch 6 is branched into two to support two metal terminals (leads) 5 inside the piezoelectric vibrator. The portion in contact with the metal terminal 5 is composed of a glass portion 8 which is an insulator as in the portion where the metal terminal 5 penetrates the metal base 3 in an airtight manner, and is electrically insulated from the metal terminal 5. It is electrically insulated from the metal terminal 5 and does not affect the oscillation frequency of the piezoelectric vibrator. Due to the support branch 6 of the present invention, vibration and impact applied to the metal terminal 5 outside the metal case 2 from the outside do not directly apply to the piezoelectric element plate 1 via the metal terminal 5 and the support 7. The stress generated when the metal base 3 is deformed by the weld pressure applied to the weld joint portion 4 in the weld process at the time of manufacturing the piezoelectric vibrator is absorbed by the support branch 6 and is not applied to the piezoelectric element plate 1 but is defined. The oscillation frequency of the piezoelectric vibrator is not changed.
[0009]
FIG. 2 is a diagram of another embodiment. FIG. 2 is a front perspective view of a support structure for a piezoelectric vibrator as in FIG. 1. The piezoelectric element plate 1 is held in a vertical direction by a metal terminal 5 via a support 7. Inside the piezoelectric vibrator, the two metal terminals 5 are bent so as to approach each other, do not contact each other, and pass through the inside of the glass support branch 9. The glass support branch 9 prevents external stress applied to the metal terminal 5 on the outside of the metal case 2 by the glass support branch 9, and directly passes through the metal terminal 5 and the support 7 to the piezoelectric element plate 1. In addition, the glass support branch 9 also prevents the stress caused by the deformation of the metal base 3 due to the weld pressure applied to the weld joint portion 4 in the weld process during the manufacture of the piezoelectric vibrator. It is not added to the piezoelectric element plate 1, and the oscillation frequency of the specified piezoelectric vibrator is not changed.
[0010]
The support branch 6 may be configured using the same material as the piezoelectric body of the piezoelectric vibrator. When the piezoelectric body is quartz, quartz is also used as the material of the support branch 6. In this case, since the support branch 6 has the same thermal expansion coefficient as that of the piezoelectric body, even when the temperature changes, the support branch 6 portion generates unnecessary thermal distortion and acts on the oscillation frequency of the piezoelectric vibrator. There is no.
[0011]
Glass and quartz have been taken as examples of the insulator constituting the support branch, but other insulators may be used.
[0012]
【The invention's effect】
By using the support structure of the piezoelectric vibrator according to the present invention, the weld pressure applied to the metal base during the weld process during the manufacture of the piezoelectric vibrator deforms the metal base, and the stress accompanying the deformation is a specified value of the frequency. In addition, the vibration resistance and impact resistance applied from the outside of the piezoelectric vibrator are improved, and the piezoelectric vibrator can maintain a stable frequency.
[0013]
In addition, the piezoelectric oscillator constituting the piezoelectric vibrator of the present invention is not limited to the piezoelectric vibrator alone of the present embodiment, and the effect of eliminating the change in the characteristics such as the frequency as described above can be obtained. As a result, it was possible to improve the overall yield of the piezoelectric oscillator.
[Brief description of the drawings]
FIG. 1 is a front perspective view of a support structure of a piezoelectric vibrator according to the present invention.
FIG. 2 is a front perspective view of a piezoelectric vibrator support structure according to another embodiment of the present invention.
FIG. 3 is a front perspective view of a conventional support structure for a piezoelectric vibrator.
1 Piezoelectric base plate 3 Metal base 5 Metal terminal (lead)
6 Support branch 7 Support

Claims (1)

In the piezoelectric vibrator supporting structure in which the piezoelectric element plate is held by a support fixed to two metal terminals hermetically penetrating the metal base,
A support branch projecting from the metal base to the inside of the piezoelectric vibrator branches,
A structure for supporting a piezoelectric vibrator, wherein the branched support branches support the two metal terminals while being electrically insulated from the two metal terminals.

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