JPS6134756Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromechanical filter comprising a plurality of rectangular piezoelectric plates each having an electrode formed on its main surface, supported and connected by a rod-shaped connector connected to the electrode. The purpose is to provide an inexpensive filter that has stable characteristics and is easy to manufacture.

Conventionally, this type _of electromechanical filter, as shown in _FIG . By soldering and connecting the oscillators F 1 and F 2 , the rod-shaped connector 5 supports them, and the oscillators F ₁ and F ₂
is placed in the frame space 9 of the rectangular insulating frame 7,
It is known that the end portion 5' of the rod-shaped connector 5 is soldered to an electrode 11 provided by printed wiring on the surface of the frame 7. In addition, 13 is a vibrator
These are input/output leads derived from F ₁ and F ₂ .

An electromechanical filter with this structure has oscillators F ₁ , F ₂
can be supported and protected by the frame 7, but it has the following drawbacks.

(a) Since the rod-shaped connector 5 is used separately from the vibrators F ₁ and F ₂ and the frame 7, the number of parts is large.

(b) The thin rod-shaped connector 5 must be connected to the electrode 11 of the frame 7 by soldering, which is a cumbersome process.

(c) It is difficult to control the amount of solder when connecting the rod-shaped connector 5 and the electrode 11 of the frame, and it is also difficult to determine the connection position, which causes unnecessary vibrations.

(d) When the bar-shaped connector 5 and the electrode 11 of the frame are soldered, the soldering heat is transmitted through the connector 5, and the solder connecting and supporting the piezoelectric vibrator and the connector melts, making the piezoelectric vibrator easy to come off and Ta.

(e) When connecting to an external circuit, lead terminals had to be attached and connected separately from the frame 7, making the work complicated and making it difficult to reduce costs.

The present invention improves the above-mentioned drawbacks and will be explained below with reference to the drawings. Note that the same parts as in the conventional example are given the same numbers.

FIG. 1 shows an embodiment of the present invention, in which vibrators F ₁ and F ₂ with electrodes 3 formed on the main surface of a strip-shaped piezoelectric plate 1 by a conventionally known method are connected to a coupler 15 and a vibrator. Connecting and supporting the electrode 3 to the connector 15 by connecting it by a known method such as soldering,
Frame-shaped terminal plate 21 having two opposing sides 17 and 19
The oscillators F ₁ and F ₂ are arranged within the frame 23 . Further, on the outside of the frame-shaped terminal plate 21, there is provided a conductive metal terminal plate 31 to which an input/output lead 25 is connected substantially parallel to the two opposing sides 17 and 19.

And the frame-shaped terminal plate 21 and its two opposing sides 1
The connector 15 connecting between 7 and 19 is integrally formed and is made of the same conductive metal plate as the conductive metal terminal plate 31. Since the frame body 7 and the separate connector 5 are not used, the number of parts is small, and the troublesome work of connecting the connector 15 to the frame-shaped terminal plate 21 is unnecessary, and an inexpensive electromechanical filter with stable characteristics can be obtained. can get.

Further, the frame-shaped terminal plate 21 and the conductive metal terminal plate 31 of the present invention can be formed simultaneously or continuously using a strip-shaped conductive metal plate by a method such as punching. Reference numeral 27 denotes a support portion that supports the frame-shaped terminal plate 21 and the conductive metal terminal plate 31 when they are formed continuously, and connects the vibrators F ₁ and F ₂ to the connector 15 of the continuous frame-shaped terminal plate 21. Install input/output lead 2
5 to the conductive metal terminal plate 31, the broken line 2
By cutting from 9, the electromechanical filter of the present invention can be manufactured in large quantities. Of course, the broken line 29 after cutting
Since the upper part must be supported integrally, for example, a cap-shaped insulating material (resin, etc.) is placed over the frame-shaped terminal plate 21 containing the vibrators F ₁ and F ₂ and the conductive metal terminal plate 31, and the insulating material is Supporting means such as crimping the mouth of the object is necessary. By covering with an insulating material, the vibrators F ₁ and F ₂ can be protected.

Incidentally, the frame-shaped terminal plate 21 and the conductive metal terminal plate 31 are made of an elastic conductive metal such as phosphor bronze, and their shapes are not _limited . Requires a space where F ₂ can be placed. Further, since the frame-shaped terminal plate 21 and the conductive metal terminal plate 31 can themselves be used as leads that can be connected to a printed circuit board, there is no need for a separate lead for connection to an external circuit.

As described above, in the present invention, a plurality of vibrators each having electrodes provided on the main surface of a piezoelectric strip are supported and connected by a coupler and placed within the frame of a frame-shaped terminal plate having opposing sides. In an electromechanical filter,
A frame-shaped terminal plate also made of a conductive metal plate, a connector that connects and is integral with the opposing sides of the frame-shaped terminal plate, and a connector that is formed on the outside of the frame-shaped terminal plate and extends approximately parallel to the opposing sides. It is characterized by a conductive metal terminal plate that extends and connects input and output leads, which can significantly reduce the number of parts. The connector does not need to be attached to the frame, and can be formed at the same location as the frame-shaped terminal plate and the conductive metal terminal plate at the same time, simplifying manufacturing and stabilizing the characteristics.

It goes without saying that these advantages combine to make the electromechanical filter inexpensive.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the electromechanical filter of the present invention, Fig. 2 is a circuit diagram of the electromechanical filter of the invention, and Fig. 3 is a plan view showing a conventional electromechanical filter. be. 1: Strip-shaped piezoelectric plate, 5: Rod-shaped connector, 7: Insulating frame, 9, 23: Vacant space, 15: Connector, 21:
Frame-shaped terminal board, 27: Support part, 31: Conductive metal terminal board.

Claims (1)

[Scope of utility model registration request] In an electromechanical filter in which a plurality of vibrators each having electrodes provided on the main surface of a piezoelectric strip are supported and connected by a coupler and arranged within a frame of a frame-shaped terminal plate having opposing sides, the same conductivity a frame-shaped terminal plate made of a metal plate; a connector that connects and is integral with the opposing sides of the frame-shaped terminal plate; and a connector extending substantially parallel to the opposing sides on the outside of the frame-shaped terminal plate; An electromechanical filter characterized in that it is equipped with a conductive metal terminal plate to which input and output leads are connected.