JPS5855691Y2 - ceramic filter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ceramic filter using a piezoelectric resonator.

Conventional multi-element ladder type ceramic filters can be constructed by soldering between predetermined terminal plates or by integrally manufacturing them in order to configure a desired circuit.

However, the former has problems in workability and reliability, and the latter increases the cost of the terminal board and has extremely poor workability, making automatic assembly of the filter almost impossible.

Another method is to use a filter in which a conductive material is housed in a lower portion provided on the inner surface of the case, and a predetermined terminal plate foot is brought into contact with the conductive material.

However, there is a problem with reliability because the conductive material and the terminal plate foot are simply butt-contacted.

In order to eliminate such drawbacks, the present invention improves the contact portion between the conductive material and the terminal plate foot of the conventional method, and provides a connector portion on the conductive material, which will be explained below with reference to the drawings.

FIG. 1 is a sectional view of a filter showing the second embodiment of the present invention.

As shown in the figure, 1 is a thick-walled piezoelectric resonator, and 2 is a thin-walled piezoelectric resonator.

Terminal plates 3 and 4 having small protrusions for contacting the vibration contacts of these resonators 1゜2 and filter components such as an insulating plate 5 inserted in a predetermined position are crimped and supported within the case 7 by a crimping body 6. be done.

A lower part 8 is provided on the bottom surface of the case 7, and the legs 9 of the terminal board 4 and the connector 10 are housed in the lower part 8.

The connector 10 is provided with a groove, and by contacting and inserting the legs 9 into the groove, conduction can be established between the predetermined terminal plates 4 via the connector 10.

A lid 11 is provided on the upper part of the case 7, and the lid 11 prevents the components from popping out, and also suppresses the terminal board 4 to make the contact between the legs 9 and the connector 10 more reliable.

According to this embodiment, the lower part 8 is located on the bottom surface of the case 7, but the lower part 8 is located on the side surface of the case 7 or the lid 11 of the case 7.
The present invention is also possible even if it is provided in

Further, the contact portions of the legs 9 and the connector 10 may be provided with small protrusions as necessary to achieve more reliable contact.

As described above, according to the present invention, soldering between predetermined terminal boards 4 is not necessary, so that workability and reliability are improved.

Further, since it is not necessary to integrally manufacture the predetermined terminal plates 4, workability is extremely good, and automatic assembly of the filter becomes possible.

Furthermore, unlike the case where a predetermined terminal plate foot and a conductive material are simply brought into contact with each other in the lower part of the case, reliable contact can be obtained.

FIG. 2 shows a sectional view of the connector 12 as a second embodiment.

The connector 12 of this embodiment is made up of two bent plates fixed together, and the contact portion of the connector 12 that comes into contact with the leg 9 has spring properties, so that more reliable contact can be obtained than in the first embodiment.

FIG. 3 shows a sectional view of the connector 13 as a third embodiment.

The connector 13 is made by bending a single plate as shown in the figure, and the manufacturing cost is lower than that of the second embodiment.

As described above, according to the present invention, there is no need for soldering between predetermined terminal plates or integral fabrication, and since reliable contact is achieved by the connector, it is possible to provide an extremely inexpensive and highly reliable ceramic filter.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a filter showing a first embodiment of the present invention, Fig. 2 is a sectional view of a connector part showing a second embodiment, and Fig. 3 is a sectional view of a connector part showing a third embodiment. FIG. In the figure, 1 is a thick-walled piezoelectric resonator, 2 is a thin-walled piezoelectric resonator, 3 and 4 are terminal plates, 5 is an insulating plate, 7 is a case, 8 is a lower part, 9 is a foot of the terminal plate, 10.12 and 13 is a connector.

Claims (1)

[Scope of utility model registration request] After housing the piezoelectric resonator group, the terminal plate having small protrusions for contacting the vibration contacts of the resonator group, and the ceramic filter components formed by the insulating plate, etc. in the case, the ceramic filter is crimped and supported. A ceramic filter characterized in that the predetermined terminal plate foot is brought into contact with a connector housed in a lower portion provided on the inner surface of the case.