JPS5883417A - Piezoelectric porcelain filter - Google Patents

Abstract

PURPOSE:To obtain a piezoelectric porcelain filter provided with the construction of axial symmetry and enabled to use the same components without causing short-circuit due to a capillary tube phenomenon, even if components are mutually bonded with a conductive adhesives. CONSTITUTION:Input and output resonance electrodes 1a, 1b split at the side of piezoelectric element chips and input and output electrodes 2a, 2b for leads are provided with baking or vacuum-deposition. The other element chip is symmetrically provided with resonance electrodes 1c, 1d and output electrodes 2c, 2d for leads. The upper side of the element chips is provided with common electrodes 3a, 3b to connect piezoelectric elements 10, 11 to the other components. The back side of the chips is provided with earth electrodes 4a, 4b at the surface corresponding to the electrodes 1a, 1b, 1c and 1d.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chip-shaped piezoelectric ceramic filter having a filter function.

There are various types of chip FF11 products that are being developed as a trend in the near future of parts, such as tip resistors, chip capacitors, and chip 7 coils.

A conventional piezoelectric ceramic filter is shown in FIGS. 1 and 2.

The metal layer shown in FIG. 1 is constructed by bonding two gold layers (6 mm) to a P plate using a conductive adhesive (9).

P& is simply a piece of wood laminated on top of a steel plate for printed wiring. ) (On the upper left and right sides of the branched wooden pieces on the front side, there are U-shaped electrodes on the left side and symmetrical input and output signal electrodes on the right side and the left side, respectively. (
2a), (2b) K are connected and provided 1. The lower part is along the groove-shaped TFLLC, and the upper part is a horizontal common resonance [&
(5a), (31)) and the concave conductive resonant electrode (4) are all provided, and are arranged in a gap between the common am poles (2a, 1.(21)). On the back side of the piece of wood are input and output resonances (
2a), (2b) and common resonant electrodes (3a), (3b
) and the bridge part that overlaps in common with the bridge part (4) and surrounds it without overlapping the other (4). (5b) @
establish.

P plate (6) is a rectangular plate with four corners cut into triangles, U-shaped input on both tube edges, steel foil for output signal extraction (7a), (7b) t''% center base. The upper part is grooved,
A steel foil (8) for taking out the earth side is provided which extends downward from the center of the bottom of the groove and has a T-shape as a whole. The lead terminal (10a), (
101)) and (10) are provided. Copper foil for input and output 01 (7!) On foil (
9%, J.

(9b) and (9c) are used to form a piezoelectric ceramic filter. As mentioned above, the piezoelectric element (S)'
k The P plate (6) is layered with a conductive contact layer, and there is a small gap between the piezoelectric element (S) and the P plate (6) (several 1).
0 to 100 μm), and during this time, the conductive adhesive wraps around and the conductive adhesive is sucked up by capillary action.
From this nK, a fifth
As shown in the side view of the figure, there is a drawback that normal filtering characteristics may be lost due to a short circuit.

Is the present invention a drawback of the conventional technology? The same parts can be removed, the same parts can be used, the metal has a symmetrical structure, and no short circuit will occur due to the capillary phenomenon even if the parts are layered with a VC4m adhesive. [The whole purpose is to obtain porcelain sowaki money.

B5 based on all the drawings of the present invention? , reveal.

- Figs. 1, 2 and 5 are perspective views of four parts forming part #4 of the piezoelectric ceramic device of the present invention.

Figures 1 (c)), ω) po piezoelectric element, ke) kyo, ←) fig. are front and back views, m2 fig. FIG. 3 is a 7fp+ view of the input/output terminal board, (A) and (R) are front and back views, not shown.

Figure 1 (A) Nioite, (1 () l'! Piezoelectric element, (1
0-1) is a square t prismatic piezoelectric ceramic piece (hereinafter simply referred to as a wood piece), (BIIlc)
b) is a piezoelectric element, (11-1) is an elemental piece (10-1) and I
IfJ- indicates a prismatic body of size. The specific dimensions are 1FJ
5XI Xa3 (unit: mm).

A piece of wood (10-1) has several metal sides, and @rkJVc is divided into input and output side resonant electrodes with a horizontally wide long sword-shaped input and output side resonance pole (1a), (Ib) in the center. At the top of the right and left edges of the resonant electrodes (1a), (11),).

There are resonance electrodes (1a, l, (
Input/output side electrodes (2a), (2b,) 2 for external drawer are provided which are about one-fifth narrower than the v4 width of Ib). Resonant electric shock,
On the outer drawer, the metal is coated with silver by baking or vacuum steaming. On the other hand, the piece of wood (11-1) has a piece of wood (
The same electrode configuration as in 10-1) is provided with resonance [pole (IC)-(1a,), input/output side for external extraction'@pole (20, 1, C2d) k in plane symmetrical form. Wood chips (10-1,1
, (11-1) has a piezoelectric ceramic element (6) on the top surface thereof.

The tth common electrode (3a, 1.(
5b).

Wood piece (10-1), (11-1) no back lJ1] VC
c Resonant electrodes (1a), (lb), (1c), (lj)
*The slightly wider rectangular ground electrodes (4a) and (4b)' can be accommodated in the center K[of the corresponding part surface that is spaced apart from i.

The grounding terminal plate (2) in Figure 2 is the grounding element plate (12-
1) A feed board for printed wiring is laminated on the Karanaji (12-1), and the laminated board is used to form a prismatic body with a rectangular cross section and a ground element plate (12-1).
-1) Table I! kVc is a 11111 steel-shaped earth 11111 steel (6a), (6b) kvn below the center, and a copper foil xiang (5) for the common electrode connected to the upper surface (3a), (sb). will be established.

Figure 5 shows the input/output terminal boards Ql k used on the left and right Cc, and is a laminated board with a printed wiring board similar to the grounding element board in Figure 2.
1), a rectangular input/output copper foil cap (8a), (81), l'Th front and back is constructed on the lower side of the side with the long side gold-edge to the full width. The prismatic body of the input/output terminal board of the ground element plate (12-1) has the same dimensions of approximately 5 x 1.5 x 0°8 (unit: mm).

Fig. 4, fl), ←)t f'9. (The terminal board (to) for human power shown in the figure, the piezoelectric fii device element, the terminal board for grounding (2), the piezoelectric ceramic cord Uυ, and the itako plate for output (+1 ') The input steel foil part (8a) of the terminal plate/receptacle for input and the co-fitting electrode (1a) of the piezoelectric ceramic element υQ, (
lb) mounting surface, rl, earth t& (4a) surface, steel foil part (6a) of earth terminal plate (6), and t1 rolling surface of steel foil part (6b) of earth terminal plate (2) and [the surface with the ground electrode (4b) of the F1 ceramic element up? , on the other hand, the surface with the output electrodes (1) and (1d) and the surface with the output steel foil part (8b) of the terminal plate (to) for output, and? Contact and pay. In this case, 8a-2b, 5 a-5-5
b, 4a-6a, 6b-4b.

2d-8b1111] are electrically connected using a conductive adhesive. As shown in Fig. 5, a layer of deconcentrated rice chives is applied to the joint-like sill. In this case, common 'lL billion (3
a), C5b), Copper'fVi fll(5), Copper for connection? iN m (7) and for input/output! [@(9a)
Do not cover the end face with heat shrink tubing. The part that was removed using heat shrink tube? Coat with epoxy powder resin.

The piezoelectric ceramic cord of the present invention can use electric current due to the above configuration, and is easy to manufacture.
It has the advantage of achieving a size of about 3 mm (unit: mm), and the space factor is improved due to the 'FIX', which is designed to be made into a chip.

[Brief explanation of the drawing]

The present invention/) Figure 41 (c) LCB) is a perspective view of the pressure element, (Figure 1, (b) Figure 2 - perspective view of the grounding terminal board, (a) figure , (B) shows the front and back, FIG. 5 is a perspective view of a terminal board for input and output, FIGS. (A) and (B) show the front and back, and FIG. 10.11: Piezoelectric cable 10-1.1l-1 =Pressure 1 to the organ fragments 1a, 1b, 1c, 1a
=Output side co-busy'Nt(fl (2a, 2C
(2b, 2d): Outer 8 is also input for drawers, output side electrical connection 5a, 5b:: Common electrode 4a, 4b near earth 1a pole 5: Common 'Kame et al. 12 Near earth 12- 1 Near-X element plate 6a, 6b Near 1st 1lljI Copper foil part 7: Steel foil part for connection 13: For input, output phase terminal board aa, (3b: For input. Steel foil for output m 9a, 9b: Input Figure 4, Output Rigid Copper Foil Section Figure 5 Figure 6 Procedural Amendment (Method) Sent on July 31, 1980 April 18, 1981 Commissioner of the Patent Office Shima 1) Haruki Tono1, Display of the incident Special application No. 56-181798 2
Title of the invention Piezoelectric ceramic filter 3 Relationship with the case of the person making the amendment Patent applicant address 1,006 Oaza Kadoma, Kadoma-shi, Osaka 571 Name (582) Matsushita Electric Industrial' Kyozuma Miyako Co., Ltd.
- It is 5X1. in shape, which does not cause "'w)" between the 4 agents and 3 attachments, and allows the use of parts with the same size and shape, which simplifies manufacturing.
Effects such as a filter having dimensions of approximately 5×3 (unit: mm) can be obtained, and a space factor is improved because of the structure that takes into account chip formation. 4. Brief explanation of the drawings Figure 1 shows a conventional piezoelectric 8-piece filter piezoelectric element, (A) is a front view, (the river is a back view, Figure 2 is a plan view of a conventional piezoelectric ceramic filter, and Figure 3 is a front view. The figure is a partial side view of FIG. 2 for explaining the conventional drawbacks, and FIG. 4 is a perspective view of the piezoelectric element of the present invention.
is the piezoelectric element on the left (10);
is a back view, FIG. 5 is a perspective view of the grounding terminal plate of the present invention,
(a), -) are plan view, back view, Fig. 6 is a perspective view of the input/output terminal board, (rl, i port 1 is plan view, back view, Fig. 7 is the configuration of the piezoelectric ceramic filter of the present invention) FIG. 8 is a perspective view showing the parts arranged in the order of assembly, and FIG. 8 is a perspective view of the piezoelectric ceramic filter of the present invention in which the parts are arranged in contact with each other. 10.11: Piezoelectric element 1a, lb% 10 % 1d:
Output side resonance electrode 1k (2a, 2c), (2b12d): input for external extraction, output side electrode 3a. 3b: Common electrode 4 a's 4 b: Earth electrode
5: Copper foil part for common electrode 12: Terminal board for ground -12-
1: Earth element board 6a, 6b: Earth side copper foil part 13
: Input and output terminal board 8a, 8. b: Copper foil parts for input and output 9a, 9b: Copper foil parts for input and output Patent Applicant Matsushita Electric Industrial Co., Ltd. Agent Patent attorney Isao Abe tA) (B) tA+ (β2
Figure 4 Cg)

Claims (1)

[Claims] Two co-containing electrodes are integrally provided on the surface of one corresponding side of a prismatic body with a rectangular cross section that is a piezoelectric ceramic F, and a ground electrode is provided on the other surface at a position overlapping the two resonant electrodes. The first pressure 'It:
A second pressure WIL element with an external drawer t& provided on the opposite side is laminated on a 1-lint wiring steel plate, and the piezoelectric element is placed on the front and back surfaces of the corresponding one side of a 7c lJr IfI rectangular prism body (hereinafter referred to as P plate). A to the lower part of the element's ground 'RL' than the same height. - A steel foil f at the same height as the external drawer IIE pole below the piezoelectric cable on the ground end plate provided with the earth side copper foil part and the lower part of one side of the P plate. Consists of two terminal boards for input and output with IJ7 installed, input terminal board, first piezoelectric element, ground end, second pressure 11L element, terminal plate steel rim, external drawer' * pole -Earth゛Turtle, Earth 1
411 Steel Foil Department, Earth'i! The poles, external extraction electrodes, and copper foil caps are connected to each other with conductive adhesive, and the outer periphery of the side is covered with a heat absorbing tube.41! Piezoelectric ceramic filter coated with gK epoxy powder resin.