KR950003958Y1 - Case structure for ladder type piezo filter - Google Patents

Abstract

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Description

Case Structure of Ladder Type Piezoelectric Filter

1 is a perspective view showing the structure of a conventional ladder-type piezoelectric filter case.

2 is a perspective view of a conventional sealing plate.

Figure 3 is a conventional longitudinal cross-sectional front view.

Figure 4a, Figure 4b is a partial cutaway perspective view and plan view of the case showing the structure of the piezoelectric filter case according to the present invention.

Figure 5 is a perspective view of the cover upside down of the subject innovation.

6 is a perspective view of a lead terminal of the present invention.

7 is a longitudinal cross-sectional view of the assembled state of the present invention.

* Explanation of symbols for main parts of the drawings

1, 11: Case body 2a-2e: Lead terminal

3a, 3b: Connector 4: Leaf spring

7: epoxy occasional 8: resonator

12a to 12e: Lead hole 13a, 13b: Connection terminal groove

14 cover 14a: contact protrusion

15: sphere

The present invention relates to a ladder-type piezoelectric filter, and more particularly, to a case structure of a ladder-type piezoelectric filter to improve the structure of the case to promote stable assembly of components and to reduce production costs by preventing the deterioration of the filter characteristics. .

Conventional ladder type safety filters have springs after inserting lead terminals 2a to 2e and resonators 8 into the box-shaped case 1 as shown in FIG. As the terminal 4, the internal parts are brought into close contact with each other, the spacer 5 is covered, and as shown in FIG. 2, the sealing plate 6 in which the lead holes 6a are perforated is attached to the lead portions of the lead terminals 2a to 2e. It is a structure sealed after being inserted and covered from the epoxy resin 7. Here, the lead terminal 2a is an input terminal, the lead terminal 2d is an output terminal, and the lead terminals 2b, 2c, and 2e are ground terminals.

Such a conventional structure has a problem that it is very difficult to insert the internal close contact spring terminal 4 because the whole structure is small, assembly time is long, and deformation is easily caused by frictional contact with the case 1 during insertion. .

In addition, in the process of inserting the spacer 5 and the encapsulation plate 6 in order to mold the epoxy resin 7, the position of the parts in the interior becomes unstable due to the shaking of the lead terminals 2a to 2e. There was a problem such as being lowered.

The purpose of the present invention is to quickly and easily assemble, and to be assembled in a stable state without deformation or positional change of parts during assembly, it is possible to prevent the deterioration of the characteristics of the filter, and to reduce the number of parts to improve assembly and productivity To provide cost savings.

In order to achieve the object of the present invention, a ladder-type piezoelectric filter which is assembled in a case by contacting a plurality of resonators between each lead terminal, respectively, the inner space is partitioned into an upper part insertion space and a lower lead extraction space by a partition plate. In addition, the partition plate is drilled through a lead hole through which a plurality of lead terminals are penetrated and formed on one side of the case body having a connection terminal groove into which the connection terminal is inserted, and the lead insertion terminal of the case body. And the case structure of the ladder-type piezoelectric filter is provided, characterized in that consisting of a cover formed with a contact protrusion for close contact with the connection terminal and the resonators.

Hereinafter, the case structure of the ladder-type piezoelectric filter according to the present invention will be described in detail according to the embodiment shown in the accompanying drawings.

Figure 4 shows the case structure of the ladder-type piezoelectric filter of the present invention, as shown in the inner space of the box-shaped case body 11 by the partition plate 15 the upper component insertion space (11a) and the lower lead The lead holes 12a to 12e through which the lead terminals 2a to 2e are penetrated through the lead-out space 11b, and a plurality of (five in the drawing) lead terminals 2a to 2e are drilled in one side of the partition plate 15. Connection terminal grooves 13a and 13b into which the connection terminals 3a and 3b are fitted, and the component insertion space 11a of the case body 11 is in close contact with one side of the inner surface as shown in FIG. The cover 14 in which the 14a was formed is covered.

The resonators 8 are inserted between the lead terminals 2a to 2e, and the lead terminals 2a to 2e are contact portions 2a 'to 2e' contacting the resonator 8 and the contact portions 2a, respectively. Lead portions 2a "to 2e" extending from 2 to 2e.

As shown in FIGS. 6A and 6B, the lead terminals 2b and 2c are in contact with the connection terminals 3a and 3b, and the widths of the contact portions 2b 'and 2c' are larger than the lead terminals 2a and 2d. The width of the contact portion 2a ', 2d', 2e 'of 2e) is smaller than the width w corresponding to the free space in order to secure a free space that can be contacted with the connection terminals 3a, 3b. .

In assembly, the resonator 8 and the lead terminals 2a to 2e are inserted into the component insertion space 11a of the case body 11, and the lead portions 2a "to 2e" are inserted into the lead holes 12a to 12e. Through).

In this state, the epoxy resin 7 is injected into the lead lead-out space 11b and cured to fix the lead terminals 2a to 2e.

Next, the connection terminals 3a and 3b are inserted and seated in the connection terminal grooves 13a and 13b, and the parts insertion space 11a of the case body 11 is covered with the cover 14 and sealed. At this time, the contact protrusion 14a formed on one side of the inner surface of the cover 14 pushes the side of the lead terminal 2e, and the lead terminals 2a to 2e and the resonators 8 are pushed toward the lead terminal 2a. Make sure they are in close contact.

Thereafter, the cover 14 is ultrasonically fused to the case body 11 to complete the assembly process.

The present invention constructed and assembled as described above has its lead surfaces 2a to 2e fixed by an epoxy resin 7 which is filled and cured in the lead drawing space 11b, and covers the cover 14 with its inner surface. Each of the lead terminals 2a to 2e, the connecting terminals 3a and 3b and the resonator 8 are assembled in a stable state by the close contact protrusion 14a formed on one side, and the deformation or positional change of the part is Since the characteristics of the filter can be prevented from being deteriorated, and parts such as spacers, encapsulation plates, and spring terminals can be removed, which is advantageous for miniaturization, assembling is quick, easy, and productivity can be improved and cost can be reduced.

Claims (1)

In a ladder-type piezoelectric filter which is assembled in a case by bringing a plurality of gongs into contact between respective lead terminals, respectively, the inner space is partitioned into an upper part insertion space 11a and a lower lead lead-out space 11b by a partition plate 15. In addition, the partition plate 15 drills through the lead holes 12a to 12e through which the plurality of lead terminals 2a to 2e are penetrated through, and at one side thereof, the connection terminals 3a and 3b. The case body 11 having the connection terminal grooves 13a and 13b into which the connector is fitted, and the part insertion space 11a of the case body 11, and close contact between the lead terminal, the connection terminal, and the resonators. Case structure of a ladder-type piezoelectric filter, characterized in that consisting of a cover 14 is formed with a projection (14a).