JPH0615338U - Piezoelectric vibration parts - Google Patents

Abstract

(57) [Abstract] [Purpose] The component height is reduced by configuring a plurality of resonant elements along the long side direction of a rectangular substrate. In addition, a piezoelectric vibrating component excellent in shieldability and manufacturability is created. A rectangular substrate and a pair of end electrodes formed at both ends in the long side direction on one main surface of the substrate,
Between a single or a plurality of intermediate electrodes formed at an intermediate position between the end electrodes and the other end surface and the intermediate electrode formed on the other main surface of the substrate, and between these electrodes. And a counter electrode that forms a plurality of resonant elements, and each of the end electrode, the intermediate electrode, and the counter electrode is formed over the entire length of the substrate in the short side direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric vibration component such as a dual mode filter.

[0002]

[Prior art]

 Conventionally, a tuning fork type dual mode filter has been known as this type of piezoelectric vibrating component. As shown in FIG. 3, this is composed of a rectangular flat plate-shaped piezoelectric substrate 21 in which a notch 20 in the long side direction is formed, and the substrate is provided on each of the two main surfaces of the opposing substrate parts across the notch 20. Two resonant elements 25a and 25b are formed by forming electrodes 22a, 22b, 23 and 24 facing each other with 21 in between. The periphery of these resonant elements 25a and 25b is covered with resin or the like, and the lead electrodes corresponding to the end electrodes 22a and 22b and the ground electrode 24 of each resonant element 25a and 25b are connected. ing.

[0003]

[Problems to be solved by the device]

 However, the conventional piezoelectric vibrating component has the following problems. That is, this piezoelectric vibrating component is normally mounted on the printed circuit board in an upright posture, but there is a limit in reducing the short side of the substrate due to the lateral widths L1 and L2 of both resonant element portions with the cuts in between. Therefore, when the piezoelectric vibration component is incorporated into a required circuit, the piezoelectric vibration component projects higher than other electronic components.

On the other hand, the piezoelectric vibrating component is laid on a printed circuit board and each lead terminal is bent and incorporated in a circuit to reduce the protruding height. However, since this work needs to be performed in consideration of the state around the piezoelectric vibrating component, it cannot be performed automatically and must be done manually. The bending work of the lead terminals is troublesome and the cost is increased.

In view of the above conventional problems, the present invention can reduce the protrusion height in the embedded circuit without the troublesome work of bending the lead terminal, thereby reducing the size of the entire circuit. It is an object to provide a useful piezoelectric vibrating component.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, in the present invention, end electrodes are formed at both ends in the long side direction on one main surface of a rectangular substrate, and a single electrode is provided at an intermediate position between the end electrodes. Alternatively, a plurality of intermediate electrodes are formed, and on the other main surface of the substrate, opposing electrodes that face the end electrodes and the intermediate electrodes and configure a plurality of resonant elements are formed. Each of the end electrode, the intermediate electrode and the counter electrode is formed so as to have a length over the entire length of the substrate in the short side direction.

[0007]

[Action]

 According to the above configuration, since a plurality of resonant elements are formed along the long side direction of the rectangular substrate without cuts, the short side dimension of the substrate becomes a dimension corresponding to a single resonant element, and the piezoelectric element Since the height of the entire vibrating component is significantly lower than that of the conventional one, it does not project higher than other electronic components when this piezoelectric vibrating component is incorporated into a circuit.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In this embodiment, the present invention is applied to a dual mode filter for explanation.

FIGS. 1 and 2 show a double mode filter as a piezoelectric vibrating component according to an embodiment of the present invention. FIG. 1 is a front perspective view thereof, and FIG. It is a rear side perspective view. In these figures, reference numeral 1 is a substrate, which is made of an elongated rectangular flat plate made of ceramic and is polarized in the long side direction. As shown in FIG. 1, a pair of end electrodes 2 and 3 and an intermediate electrode 4 are formed on one main surface of the substrate 1 over the entire length of the substrate 1 in the short side direction. Each of the end electrodes 2 and 3 is formed at both ends of the substrate 1 in the long side direction, and has vibrating electrodes 5a and 5b inside thereof. The main part of each of the end electrodes 2 and 3 and the vibrating electrodes 5a and 5b are connected by a lead part. The intermediate electrode 4 is formed between the end electrodes 2 and 3. The intermediate electrode 4 is composed of a capacitance portion 6 at the center of the long side of the substrate 1 and vibrating electrodes 7a and 7b on both sides thereof. The capacitance portion 6 and the vibrating electrodes 7a and 7b are different from each other. Each is connected by a lead part. Therefore, one pair of the vibrating electrodes 7a and 7b of the intermediate electrode 4 and the vibrating electrodes 5a and 5b of the respective end electrodes 2 and 3 which will form the resonant elements 11a and 11b described later sandwich the capacitance section 6 therebetween. Since they face each other, they are shielded by the capacitance section 6 formed over the entire length of the base plate 1 in the short side direction.

On the other hand, on the other main surface of the substrate 1, as shown in FIG. 2, a counter electrode 8 facing the end electrodes 2, 3 and the intermediate electrode 4 across the substrate 1 is provided on the substrate 1. It is formed over the entire length in the short side direction. The counter electrode 8 is composed of a central ground electrode 9 and vibrating electrodes 10a and 10b on both sides thereof. The respective vibrating electrodes 10a and 10b are formed at positions facing the vibrating electrodes 5a and 5b of the end electrodes 2 and 3 and the vibrating electrodes 7a and 7b of the intermediate electrode 4, respectively, which are opposite to each other. 11a and 11b are configured. The ground electrode 9 is formed between the vibrating electrodes 10a and 10b, and is connected to each of the vibrating electrodes 10a and 10b via the lead portion.

Input and output lead terminals 12 and 13 are connected and fixed to each of the end electrodes 2 and 3 by soldering or a conductive paste. Further, a lead terminal 14 for grounding is also connected and fixed to the ground electrode 9 by soldering, conductive paste or the like. The lead terminals 12, 13 and 14 are drawn out in the short side direction of the substrate. In the substrate 1, the portions sandwiched between the respective vibrating electrodes 5a, 5b, 7a, 7b on one main surface and the respective vibrating electrodes 10a, 10b on the other main surface are piezoelectric, and the capacitance section 6 and the ground electrode are formed. The part sandwiched between 9 and 9 has a dielectric property.

The resonance elements 11 a and 11 b thus configured are energy trap type thickness shear vibration mode elements. Then, a resin exterior 17 such as an epoxy resin is provided around the inner element 15 including the resonant elements 11a and 11b via an elastic body 16 such as silicon rubber.

Although two resonant elements are provided in this embodiment, the present invention is not limited to this, and three or more resonant elements may be provided in the long side direction of the substrate.

By the way, as a procedure for producing the dual mode filter having the structure as described above, although not shown, first, a flat plate-shaped intermediate substrate body having a size corresponding to a large number of filters is formed. , And the electrode patterns that correspond to the required individual electrodes, for example, the end electrodes 2 and 3 are collectively formed on each of the front and back surfaces, and then the intermediate substrate body is cut into a predetermined size. -In general, it is divided into individual dual-mode filters. When viewed from such a manufacturing procedure, in the dual mode filter having the structure according to the present embodiment, each of the end electrodes 2, 3, the intermediate electrode 4, and the counter electrode 8 has the entire length in the short side direction of the substrate 1. Since it has a long length, it has an excellent advantage that the manufacturing procedure can be simplified.

[0015]

[Effect of device]

 As described above, according to the present invention, since a plurality of resonant elements are configured along the long side direction of the rectangular substrate, the short side dimension of the substrate is set to a dimension corresponding to a single resonant element. As a result, the overall height of the piezoelectric vibrating component becomes low, and even if the piezoelectric vibrating component is installed in a standing posture in the circuit, it does not protrude higher than other electronic components, and the entire circuit can be made smaller. it can.

[Brief description of drawings]

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

FIG. 2 is a rear perspective view of the piezoelectric vibration component according to the embodiment of the same.

FIG. 3 is a front perspective view of a conventional piezoelectric vibration component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2, 3 ... End electrode 4 ... Intermediate electrode 8 ... Counter electrode 11a, 11b ... Resonant element

Claims (1)

[Scope of utility model registration request] 1. A rectangular substrate, a pair of end electrodes formed at both ends in the long-side direction on one main surface of the substrate, and a single or intermediate electrode formed between the end electrodes. A plurality of intermediate electrodes, and a counter electrode that is formed on the other main surface of the substrate and that faces the end electrodes and the intermediate electrodes and that forms a plurality of resonant elements between these electrodes. The piezoelectric vibrating component, wherein each of the end electrode, the intermediate electrode and the counter electrode is formed over the entire length of the substrate in the short side direction.