JPS5855689Y2 - ceramic filter - Google Patents

Description

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

Conventional ladder-type element ceramic filters configure a desired circuit, so the first and second methods include soldering between the desired terminal plates or integrally manufacturing them, but the former is reliable and the latter is difficult to work with. I have a sexual problem.

A third method is to bring the desired terminal plate foot into contact with a metal plate pre-molded in a lower portion provided on the inner surface of the case or a metal plate housed separately.

However, in the former case, the cost of the case is very high, and in the latter case, the metal plates are very small and it is necessary to insulate unnecessary metal plates, making it difficult to store the metal plate case and even more difficult to automatically store it.

In order to eliminate such drawbacks, the present invention improves the conventional third method and uses a metal lead method to extremely simplify automatic storage, and will be explained below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a plan view of a metal lead portion used in the present invention.

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 and 2 and a filter component at the end of an insulator 5 inserted in a predetermined position are crimped and supported in a case 7 by a crimping body 6. has been done.

A lower part 8 is provided on the inner surface of the case 7, and the legs of the terminal plate 4 and a metal lead made of a resin 10 and a metal plate 11 are housed in the lower part 8.

Therefore, the contact between the legs 9 and the metal body 11 establishes electrical continuity between the desired terminal plates 4.

A lid 12 is provided at the opening of the case 7, and the lid 12 prevents the components from flying out and also holds down the terminal plate 4, thereby making the contact between the legs 9 and the metal plate 11 more reliable.

As shown in FIG. 3, the metal lead portion is provided by molding a resin 10 onto a metal plate 11 punched out using a chain lead method.

The metal lead part can be automatically cut at AA and BB points and then automatically stored.

As described above, according to the present invention, there is no need to solder between desired terminal boards 4, so that workability and reliability are improved.

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

Since there is no need to mold a metal plate in the case 7 in advance to establish conduction between desired terminal plates 4, the cost of the filter is reduced.

Since the metal lead part is of a chain lead type, it is extremely easy to automatically store the metal lead part in the lower part 8, and the left and right metal plates are reliably insulated with the resin 11 at the center.

FIG. 4 is a cross-sectional view mainly showing storage of the terminal board 4 as another embodiment, FIG. 5 is a plan view showing the metal lead part, and FIG.
The figure is a perspective view showing the state of contact between the metal lead part and the terminal part 4 of this embodiment.

In this embodiment, two metal plates 11 are used, and when stored in the case 7, CC, DD and l1. l
Cut in two places.

In the embodiment shown in FIG. 1, if the dimension L is very small (the thickness of the resonator is thin), the dimension of the resin 10 will also be small, making it difficult to insulate the left and right metal plates 11.

In the case of this embodiment, since the resin 10 can be made large as necessary, the left and right metal plates 11 are reliably insulated.

In the embodiment of the present invention, the lower part 8 is located on the bottom surface of the case 7, but the present invention can also be achieved by providing the lower part 8 on the side surface of the case 7 or on the lid 12 of the case 7.

As described above, according to the present invention, soldering between desired terminal plates and integral manufacturing are not necessary.

Further, there is no need to mold a metal plate in the case in advance to establish conduction between desired terminal plates, and there is no need to separately house the metal plates in the case.

Therefore, it is possible to provide a highly reliable and inexpensive ceramic filter.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a plan view showing the metal lead part, and Fig. 4 is a cross section near the terminal board showing another embodiment. 5 is a plan view showing the metal lead portion, and FIG. 6 is a perspective view showing the state of contact between the metal lead portion and the terminal plate. L is the distance between terminal plates, AA, BB, CC, DD. 11.
12 indicates the cutting location of the metal plate. 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 insulator, 7 is a case, 8 is a lower part, 9 is a foot, 10 is a resin, and 11 is a metal It is a board.

Claims (1)

[Scope of utility model registration request] Components consisting of a piezoelectric resonator group, a terminal plate with a small protrusion adjacent to the vibrating contact of this resonator group, and an insulator inserted at a predetermined location between these terminal plates are housed in a case. In the ceramic filter which is crimped and supported, a metal lead made of a metal plate and a resin and a foot of the desired terminal plate are housed in a lower part provided on the inner surface of the case and brought into contact with each other. .