JPH0518119U - Piezoelectric parts - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a piezoelectric component that can detect and even correct a positional deviation even in the middle of the manufacturing process. [Structure] 1 or 2 having electrodes 11a on both sides of a flat plate
The above piezoelectric vibrator 11 is sandwiched by two or more conductive terminal board plates 12 having one or two or more notches in the periphery,
In the piezoelectric component in which the piezoelectric vibrator 11 is incorporated in the case 14, one or more viewing windows 14a are provided in the case 14.
A piezoelectric component having.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to piezoelectric components, and more particularly to piezoelectric components such as oscillators, frequency filters and discriminators.

[0002]

[Prior Art]

 A ceramic oscillator is a kind of piezoelectric vibrating component, and in a frequency range of 10 KHz to 10 MHz, a vibration mode usually called a spreading vibration mode is used.

FIG. 7 shows an exploded perspective view of a ceramic oscillator using a conventional spreading vibration mode. Reference numeral 71 in the figure denotes a piezoelectric vibrator, and the piezoelectric vibrator 71 has electrodes 71a attached to both surfaces of a piezoelectric substrate 70. Further, conductive terminal plates 72 and 73 for sandwiching the piezoelectric vibrator 71 are arranged on both sides of the piezoelectric vibrator 71, and semicircular cutouts 72b are formed on the four sides of the conductive terminal plate 72, so A protrusion 72 a is formed at the center of the terminal plate 72. Further, the conductive terminal plate 73 is not formed with a semicircular cutout 72b, but is formed with a protrusion 73a at the center. Further, external lead-out portions 72c and 73c are formed on the lower portions of the conductive terminal plates 72 and 73, respectively. The main body case 74 in which the piezoelectric vibrator 71 and the conductive terminal plates 72 and 73 are housed has an opening 74a on the front surface and a groove 74b for accommodating the external lead-out leads 72c and 73c in the lower part. Has been formed. The case opening 74a of the main body case 74 is sealed by a lid 75.

In the piezoelectric component configured as described above, the piezoelectric vibrator 71 is sandwiched between the conductive terminal plates 72 and 73 on both sides thereof, and the piezoelectric vibrator 71 and the conductive terminal plates 72 and 73 are contained in the main body case 74. It is assembled by storing and sealing with the lid 75.

The ceramic piezoelectric vibrator 71 mechanically vibrates in a vibration mode determined by factors such as a shape and a polarization state according to an electric signal applied to the electrode 71a. FIG. 8 is a schematic front view showing a vibration mode of the expansion vibration mode piezoelectric vibrator 71. The outer circumference 71b of the piezoelectric vibrator 71 drawn by a solid line shows a normal state, and the outer circumference 71b of the piezoelectric vibrator 71 is displaced as drawn by a broken line in accordance with an electric signal applied to the electrode 71a. However, the electrode center portion 71c is hardly displaced. Therefore, the piezoelectric vibrator 71 is normally held and the electric signal is input and output by sandwiching the electrode central portion 71c having a small displacement amount by the projections 72a and 73a of the conductive terminal plate plates 72 and 73. Since the piezoelectric vibrator 71 is displaced according to the electric signal in this manner, when it is housed in the main body case 74, great care must be taken not to contact the inner wall 74d of the case and hinder the vibration. There is.

[0006]

[Problems to be solved by the device]

 However, in the piezoelectric component in which the above-described conventional piezoelectric vibrator 71 and conductive terminal plates 72 and 73 are mounted, the piezoelectric vibrator 71 is housed in the main body case 74 while being sandwiched between the conductive terminal plates 72 and 73. At the time of sealing the case opening 74a by the lid 75 in the final step, the protrusions 72a and 73a may be displaced from the electrode central portion 71c due to a temporary reduction in the pressure that holds the piezoelectric vibrator 71. is there. In addition, the outer periphery 71b of the piezoelectric vibrator 71 may be sealed while touching the inner wall 74d of the case. In such a case, there is a problem that the desired oscillation characteristic of the piezoelectric vibrator 71 cannot be obtained.

The present invention has been made in view of the above problems, and is a process in which a piezoelectric vibrator is sandwiched by conductive terminal plate plates and housed in a main body case, and the main body case is sealed. It is an object of the present invention to provide a piezoelectric component that can prevent displacement of the piezoelectric vibrator.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, a piezoelectric component according to the present invention is one or more piezoelectric vibrators having electrodes on both sides of a substrate, and two or more conductive terminals having one or more notches around them. A piezoelectric component sandwiched by plates, in which the piezoelectric vibrator is incorporated in a case, characterized in that one or more endoscopic windows are formed in the case, and the sealing direction is different in the piezoelectric component. It is characterized in that it has a multiple case composed of a plurality of cases, and that at least an inner case of the multiple cases has an endoscopic window.

[0009]

[Action]

 According to the above configuration, since one or more viewing windows are formed in the case that accommodates the piezoelectric resonator, the position of the piezoelectric resonator when the piezoelectric resonator is housed in the case. It becomes possible to confirm the deviation through the endoscopic window. It is also possible to correct the positional deviation from the endoscopic window using a needle-shaped jig.

In addition, when a multiple case including a plurality of cases having different sealing directions is provided, and at least the inner case of the multiple cases has an endoscopic window, complete sealing as a product is possible. In addition, it is possible to detect and correct the misalignment before the storage is completed, and defective products can be removed and corrected even in the middle of the manufacturing process.

[0011]

【Example】

 Embodiments of the piezoelectric component according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a piezoelectric component according to this embodiment. Reference numeral 11 in the figure denotes a piezoelectric vibrator, and the piezoelectric vibrator 11 is configured by forming electrodes 11a on both surfaces of a piezoelectric substrate 10. Further, conductive terminal plates 12 for sandwiching the piezoelectric vibrator 11 and the electrodes 11a are arranged on both sides of the piezoelectric vibrator 11, and semicircular cutouts 12b are formed on the four sides of the conductive terminal plate 12. A protrusion 12a is formed at the center of the conductive terminal plate 12. Further, an external lead-out portion 12c is formed at the bottom of each conductive terminal plate 12. The main body case 14 in which the piezoelectric vibrator 11 and the conductive terminal plate 12 are housed has an opening 14a in the front surface, and a groove 14b for accommodating the external lead 12c is formed in the lower part. Further, an internal viewing window 14c having four holes is formed on the side surface of the main body case 14. Further, like the main body case 14, the main body case 14 is sealed by a lid 15 having four viewing windows 15c. The four viewing windows 14c of the body case 14 and the four viewing windows 15c of the lid 15 are formed in corresponding positions.

FIG. 2 shows a perspective front view of the piezoelectric component thus constructed and assembled. The electrode 11a of the piezoelectric vibrator 11 can be visually seen from the internal window 15c of the lid 15 through the semicircular cutout 12b of the conductive terminal plate 12, and the semicircular cutout 12a of the other conductive terminal plate 12 can be seen. Through, it is possible to visually check the viewing window 14c of the main body case 14.

Therefore, it is possible to visually confirm the displacement of the position of the piezoelectric vibrator 11 until the piezoelectric components are completely assembled. It is possible to correct the deviation from the windows 14c and 15c by using tweezers or a needle-shaped jig.

FIG. 3 is an exploded perspective view showing another embodiment of the piezoelectric component according to the present invention. In the figure, 31 indicates a piezoelectric vibrator, and the piezoelectric vibrator 31 has electrodes 31 a attached to both surfaces of a piezoelectric substrate 30. Further, conductive terminal plate plates 32 for sandwiching the piezoelectric vibrator 31 and the electrode 31a are arranged on both sides of the piezoelectric vibrator 31, and semicircular cutouts 32a are formed on four sides of the conductive terminal plate 32 to form conductive terminals. A protrusion 32a is formed at the center of the plate 32. Further, a lead portion 32c for external drawing is formed under each conductive terminal plate 32. The main body case 34 in which the piezoelectric vibrator 31 and the conductive terminal plate 32 are housed has an opening 34a on the front surface, and a groove 34b for accommodating the external lead-out lead 32c is formed in the lower part. Further, in the center of the side surface of the main body case 34, one viewing window 34c having a size capable of confirming each side of the piezoelectric vibrator 31 is formed. Further, like the main body case 34, the main body case 34 is sealed by a lid 35 having an internal window 35c formed of one hole. The internal window 34c of the main body case 34 and the internal window 35c of the lid 35 are formed at corresponding positions.

FIG. 4 is a perspective front view of the piezoelectric component thus constructed and assembled. The projection 32a of the conductive terminal plate 32 can be seen in the center through the internal window 35c of the lid 35. Further, the electrode 31a of the piezoelectric vibrator 31 can be fixed through the semicircular cutout 32b of the conductive terminal plate 32. It can be visually inspected, and can be visually inspected through the semicircular cutout 32a of the other conductive terminal plate 32 to the internal window 35c of the main body case 34.

Therefore, as in the case of the above-described embodiment, it is possible to visually confirm the displacement of the piezoelectric vibrator 31 until the piezoelectric component is completely assembled, and further, the displacement of the piezoelectric vibrator 31 can be confirmed. In such a case, it is possible to correct the deviation from the endoscopic windows 34c and 35c using tweezers or a needle-shaped jig.

FIG. 5 is an exploded perspective view showing still another embodiment of the piezoelectric component according to the present invention. In this embodiment, the piezoelectric component shown in FIG. 1 is housed in an outer case 56 having a bottom opening 56a.

FIG. 6 is an exploded perspective front view of the piezoelectric component thus configured. Before the main body case 14 is sealed by the outer case 56, the electrode 11a of the piezoelectric vibrator 11 is visually observed through the semi-circular cutout 12b of the conductive terminal plate 12 from the internal window 15c of the lid 15. Further, the inner window 14c of the main body case 14 can be visually inspected through the semicircular cutout 12a of the other conductive terminal plate 12, and the bottom window opening portion can be accommodated in the external case 56. 56a is sealed with resin.

Therefore, as in the case of the above-described embodiment, the displacement of the piezoelectric vibrator 11 can be visually confirmed until the piezoelectric components are completely assembled, and the piezoelectric vibrator 11 is not displaced. If it occurs, it is possible not only to correct the shift from the viewing windows 14c, 15c using tweezers or a needle-shaped jig, but also to store it in the outer case 56 to enhance the exterior and reinforcement. I am doing it.

Although FIG. 5 illustrates the piezoelectric component using the embodiment shown in FIG. 1, the piezoelectric component as shown in FIG. It suffices if the external parts can be prevented from being displaced by putting the parts which have been confirmed so as not to exist in the outer case 56, and at the same time, the exterior can be formed.

Further, each of the above-described embodiments is an example, and the shape of the endoscopic windows 14c, 15c, 34c, 35c, the formation positions of the endoscopic windows 14c, 15c, 34c, 35c, and the endoscopic window 14c. , 15c, 34c, 35c are not limited in number, and the endoscopic windows 14c, 15c, 34c, 35c do not necessarily have to be windows made of transparent resin, but only holes are provided in the case. But good. In this case, in order to reinforce the body cases 14 and 34 provided with the viewing windows 14c, 15c, 34c, and 35c, even if the case materials are selected, the case shape design is reinforced, and the case structure is made into multiple layers. good. Either a single-layer case structure or a multi-layer case structure may be used.

In the above-described piezoelectric component according to the present embodiment, two conductive terminal plate plates are each provided with a semi-circular cutout, and the main body case and the lid are provided with one or a plurality of viewing windows. By doing so, it is possible to find the positional deviation in the middle of the manufacturing process of the piezoelectric component and to correct it. Further, by accommodating the piezoelectric component in which the displacement is prevented in the external case, the displacement can be further reinforced. Therefore, it is possible to check and correct defective products that could not be judged from the resonance characteristics of individual finished products that were conventionally inspected during the manufacturing process, which can be expected to reduce costs and improve yields.

[0023]

[Effect of the device]

 As described above in detail, in the piezoelectric component according to the present invention, one or more piezoelectric vibrators having electrodes on both sides of a flat plate, and two or more conductive terminal plates having one or more notches around them. A piezoelectric component sandwiched by plates, in which the piezoelectric vibrator is incorporated in a case, wherein the case has one or more endoscopic windows, and a multiple case including a plurality of cases with different sealing directions. Because of this, it becomes possible to detect and correct the misalignment by the time the storage is completed, and defective products can be removed and corrected even in the middle of the manufacturing process.

Therefore, it is possible to check and correct defective products, which could not be judged from the resonance characteristics of the finished products individually inspected in the related art, during the manufacturing process, and it is expected to reduce the cost and improve the yield.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a piezoelectric component according to the present invention.

FIG. 2 is a perspective front view showing an embodiment of the piezoelectric component according to the present invention.

FIG. 3 is an exploded perspective view showing another embodiment of the piezoelectric component according to the present invention.

FIG. 4 is a perspective front view showing another embodiment of the piezoelectric component according to the present invention.

FIG. 5 is an exploded perspective view showing still another embodiment of the piezoelectric component according to the present invention.

FIG. 6 is a perspective front view showing still another embodiment of the piezoelectric component according to the present invention.

FIG. 7 is an exploded perspective view showing a conventional piezoelectric component.

FIG. 8 is a perspective front view showing a conventional piezoelectric component.

[Explanation of symbols]

 11, 31 Piezoelectric vibrator 11a, 31a Electrode 12, 32 Conductive terminal plate 14, 34 Main body case 14a, 34a Internal window 56 External case

Claims (2)

[Scope of utility model registration request] 1. One or more piezoelectric vibrators having electrodes on both sides of a substrate are sandwiched by two or more conductive terminal plates having one or more notches on the periphery, and the piezoelectric vibrators are mounted on a case. In the incorporated piezoelectric component, the case has one or more viewing windows formed therein. 2. The piezoelectric component according to claim 1, further comprising a multiple case made up of a plurality of cases having different sealing directions, wherein at least an inner case of the multiple case has an internal window.