JPS60256204A - Manufacture of ceramic resonator - Google Patents

Abstract

PURPOSE:To manufacture a resonator of small size near the shape of an element by overlapping a lower pedestal and an upper pedestal so as to attain ease of alignment of the element. CONSTITUTION:The synthetic resin made lower pedestal 9 a part of which is exposed is formed incorporatedly to an electrode 7a so that one lead electrode of a rectangular piezoelectric element 1 one end of which is supported by the hook shape electrode 7a is brought into contact with the electrode plate 7a. After the element 1 is mounted on the pedestal 9, the upper face of the pedestal 9 is covered by the synthetic resin made upper pedestal 12 formed incorporatedly with the hoop electrode plate 7b similarly as the pedestal 9 and the case for the element 1 is formed by incorporating the pedestals 9, 12 while the other lead electrode of the element 1 and the electrode plate 7b are brought into contact with each other. Then the electrode plates 7a, 7b are disconnected from electrode plate connecting parts 10a, 10b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 1-1m The present invention relates to a method of manufacturing a ceramic resonator used as a filter or an oscillator in an electric circuit.

Structure of a conventional example and its problems FIG. 1 shows an assembly diagram of a conventional ceramic resonator. (1
) is a rectangular ceramic resonant element, (2) is an extraction electrode provided on the front and back sides of the element that overlaps at the main vibration part and extends to different end faces.
(3) is an external input/output terminal which is electrically connected and supported at a portion of the extraction electrode (2) outside the main vibrating member. (
Place the ceramic resonant element (1) installed as in a) into the resin case (4) in (b) as in (c), and attach the sealing plate (6) to the opening of the resin case (4). At the same time, a sealing resin (5) is filled.

However, in the above configuration, it is difficult to regulate the positions of the ceramic resonant element (1) and the terminal (3), which may cause a short circuit between the extraction electrode (2) and the terminal (3) or suppress the vibrating part of the element. In addition, the sealing resin (5) may enter through the gap between the sealing plate (6) and the case (4) and cause the ceramic resonant element (
1) may suppress the vibration of the ceramic resonant element (1) 2-. Furthermore, there was a drawback that the outer Nl shape was larger than the element shape.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a ceramic resonator that facilitates the positioning of an element and has a small shape close to that of the element.

Structure of the Invention The method for manufacturing a ceramic resonator of the present invention is such that one lead electrode of a rectangular piezoelectric element mounted with one end supported by a first hoop-shaped electrode plate comes into contact with the first hoop-shaped electrode. A synthetic resin lower pedestal with a part exposed is integrally molded with the first hoop-shaped electrode plate, and this lower pedestal-I]
After placing the rectangular piezoelectric element on the holder, the upper surface of the lower holder is covered with a synthetic resin upper holder integrally molded with the second hoop-shaped electrode plate in the same way as the lower holder, and the other side of the rectangular piezoelectric element is placed. With the extraction electrode and the second hoop-shaped electrode in contact with each other, the lower pedestal and a part of the pedestal are integrated to form a case of a rectangular piezoelectric element, and then the first and second hoop-shaped It is characterized in that each electrode plate is cut away from the electrode plate connecting portion.

DESCRIPTION OF EMBODIMENTS A specific embodiment of the present invention will be described below with reference to FIGS. 2 to 6.

In Fig. 2, (1) is a ceramic resonant element with the same mechanism as the conventional one, and (7a) is electrically connected by contacting one extraction electrode (2) other than the main vibrating part of the ceramic resonant element (1). The connecting part (IQ
a') is provided with a pitch hole (8). (9) is a synthetic resin F section holder integrally molded with the electrode plate (7a), and its shape is such that the electrode plate (7a) is exposed at one end, and the other end is the lead-out electrode (2 ) The protrusion is as high as the thickness of (
II) is formed, the ceramic resonant element (1) is placed on the lower pedestal (9) as shown by arrow A in Fig. 2, and one end is brought into contact with the electrode plate (7a) J:x. , extraction electrode (2
) is brought into contact with the protrusion (11), the l-mi vibrating portion of the ceramic resonant element (1) is suspended from the lower pedestal (9). In addition, like the lower pedestal (9) and the electrode plate (7a), there is a -I made of synthetic resin that covers the upper surface of the lower pedestal (9).
- part pedestal (12) is integrally molded with the hoop-shaped electrode plate (7b), and after placing the ceramic resonant element (1) on the lower pedestal (7b) J- as shown in Fig. 2, Next, as shown in FIG. 3, it is placed on the lower pedestal (9) and the electrode plate (7a). - The two-part pedestal (12) is formed in the same shape as the lower pedestal (9). The lower cradle (9) and the two-part cradle (
12), the ceramic resonant element (1) is sandwiched in the vertical direction as shown in FIG.
i(2) is in contact with the N-electrode plate (7b). In this state, the interface between the lower pedestal (9) and the two-part pedestal (12) is pasted together by adhesive or welding to form an integral body.

Next, separate the lower pedestal (9) and the two-part pedestal (12) from the connection part (]Oa) (1, Ob) of the electrode plates (7a) (7b), and remove the electrode plates (711) (7b). A completed product is obtained by folding as shown in FIG. 5 or 6, and a small ceramic resonant element that is only one size larger than the external shape of the ceramic resonant element (1) is obtained.

Effect 4 of the invention - As explained above, according to the method of manufacturing a ceramic resonator of the present invention, by overlapping the lower pedestal and the two-part pedestal, the piezoelectric element position is reliably regulated, and the piezoelectric element is Support and electrical connection are possible, and vibration is not suppressed because a gap is created around the main vibrating part of the piezoelectric element by the thickness of the electrode plate.

Since it is made of molded resin that serves both as a support for the piezoelectric element and as an exterior, it can be made smaller. Since it uses a hoop-shaped electrode plate, it is suitable for mass production, and positioning can be performed using the feed pitch hole of the hoop.

[Brief explanation of drawings]

FIG. 1 is an exploded view and cross-sectional view showing the structure of a conventional ceramic resonator, FIGS. 2 and 3 are assembly process explanatory diagrams of a specific embodiment of the present invention, and FIG. The assembled sectional view and FIGS. 5 and 6 are perspective views of the completed product. (1) Ceramic resonant element, (2)...Drawer ff
i-pole, (7a) (7b)... hoop-shaped electrode plate, (
8)...Pitch hole, (9)-lower pedestal, (]0a)
(IObl/Connection part, (+2) -= 1st part cradle agent Yoshihiro Morimoto Figure 1 (a) (C) (b) 7- Figure 2 = 17- Figure 4 Figure 5

Claims (1)

[Claims] 1. A lower receiver made of synthetic resin with a part thereof exposed so that one lead electrode of a rectangular piezoelectric element mounted with one end supported by a first hoop-shaped electrode plate contacts the first hoop-shaped electrode. After a base is integrally molded with the first hoop-shaped electrode plate and a rectangular piezoelectric element is placed on the lower pedestal, a synthetic resin is integrally molded with the second hoop-shaped electrode plate in the same way as the lower pedestal. The lower pedestal and the upper pedestal are integrated into a rectangular shape with the upper surface of the lower pedestal covered with a manufactured upper pedestal and the other extraction electrode of the rectangular piezoelectric element and the second hoop-shaped electrode in contact with each other. A method of manufacturing a ceramic resonator, which comprises forming a case of a piezoelectric element, and then cutting first and second hoop-shaped electrode plates from respective electrode plate connection parts.