JP2896053B2 - Manufacturing method of ceramic filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a three-terminal ceramic filter using a strip-shaped piezoelectric vibrator.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional ceramic filter of this type. This is because the input terminal 1 and the output terminal 2 are planted below the base 3 and the terminals 1, 2
A pair of protrusions 1a, 2a respectively formed in the base 3 are projected into the recess 3a of the base 3, and the electrodes on the lower surface of the piezoelectric vibrator 4 mounted in the recess 3a are brought into contact with the protrusions 1a, 2a, and the ground terminal 5 is formed. Is fixed on the upper surface of the base 3 and the ridge 5a
Is brought into contact with the electrode 4 a on the upper surface of the piezoelectric vibrator 4 by utilizing the elasticity of the ground terminal 5,
Are fitted in the window holes 6a.

[0003]

However, in such a configuration, assembly such as insert molding of the terminals 1 and 2 and the base 3 and assembling of the ground terminal 5 is troublesome, and the connection state between the piezoelectric vibrator and the terminal is poor. There was a problem that was easily affected by variations in contact pressure.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to facilitate the automation of assembly, to improve the productivity, to stably connect the piezoelectric vibrator and the terminals, and to manufacture a highly reliable ceramic filter. The aim is to provide a method.

[0005]

According to the present invention, there is provided an input terminal having a lead portion 12 and a connecting piece 13 integrally provided on a substantially L-shaped frame portion 11, and a lead portion 22 provided on a substantially L-shaped frame portion 21. An output terminal provided with the connecting piece 23 integrally, and a ground terminal having a lead portion 32 and a connecting portion 33 and having one end of the connecting portion 33 integrally connected to one of the frame portions 11 and 21, Protruding from the support frame of the frame 70 to the same side and integrally forming the same lead frame 70, the connecting part 33 of the ground terminal is separated from the frame parts 11 and 21, this ground terminal is bent and formed, and a hole is formed in the center. Frame made of square-shaped insulator having
80 is the frame part of the input terminal 11 and the frame part of the output terminal
After being fixed to 21, the piezoelectric vibrator having the input electrode 41 and the output electrode 42 on the front surface and the ground electrode 43 on the back surface is arranged in the hole of the frame 80, and the connection piece 13 of the input terminal is connected to the input electrode 41. Then, the connection pieces 23 of the output terminal are soldered to the output electrodes 42, respectively.
Next, the connection part 33 of the ground terminal is opposed to the ground electrode 43 of the piezoelectric vibrator by bending the lead parts 12 and 22 of the input terminal and the output terminal, and then the connection part 33 is grounded.
And a method for manufacturing a ceramic filter to be soldered to a ceramic filter. Further, the present invention provides an input terminal in which a lead portion 12 and a connection piece 13 are integrally provided on a substantially L-shaped frame portion 11;
An output terminal in which a lead portion 22 and a connection piece 23 are integrally provided on a character-shaped frame portion 21, and a lead portion 32 and a connection portion 33, and one end of the connection portion 33 is integrated with one of the frame portions 11 and 21. The ground terminal and the ground terminal, which are connected to each other, protrude from the support frame of the lead frame 70 to the same side and are integrally formed with the same lead frame 70, and a frame 80 made of a square-shaped insulator having a hole in the center is formed. After fixing to the frame part 11 of the input terminal and the frame part 21 of the output terminal, the connection part 33 of the ground terminal is connected to the frame part.
The ground terminal is bent away from 11 and 21, and the lead portions 12 and 22 of the input terminal and the output terminal are bent and formed so that the connection portion 33 of the ground terminal faces the hole of the frame 80, and After the piezoelectric vibrator having the input electrode 41 and the output electrode 42 and having the ground electrode 43 on the back surface is disposed in the hole of the frame 80, the connection piece 13 of the input terminal is connected to the input electrode 41, and the connection piece of the output terminal is connected. 23 to the output electrode 42, connection part 33 of the ground terminal
Of the ceramic filter to be soldered to the ground electrode 43.

[0006]

1 and 2 show an embodiment of a ceramic filter according to the present invention. In these figures, reference numeral 10 denotes a lead portion 12 and a connecting piece 13 on a broad frame portion 11 having a substantially L-shape.
An output terminal 20 is formed by integrally forming a lead portion 22 and a connecting piece 23 on a substantially L-shaped frame portion 21 similar to the frame portion 11. The lead portion 12 is pulled out from a corner of the L-shaped frame portion 11, and the lead portion 22 is drawn out from one end of the L-shaped frame portion 21. 30 is the lead part 32
And a ground terminal 40 integrally formed with the connecting portion 33, and a piezoelectric vibrator 40 having an input electrode 41 and an output electrode 42 on the front surface and a ground electrode 43 on the rear surface. The piezoelectric vibrator 40 performs elongation vibration in the length direction. Input terminal 10, output terminal 20, and ground terminal 30
Is the center of the ground terminal 30, the lead 12 of each terminal,
22 and 32 are located on the same plane and parallel to each other.

The frame portion 11 and the frame portion 21 have a hole in the center.
A piezoelectric vibrator 40 is attached and fixed to a frame 80 made of a square-shaped insulator having 81.
From the opposing surfaces of the frame portions 11 and 21, the connection pieces 13 and the connection pieces 23 extend in parallel to the terminal portions 12, 22, and 32, respectively, toward the center of the vibration of the piezoelectric vibrator 40, which is a node. ing. Then, at the central portion in the longitudinal direction of the piezoelectric vibrator 40, the connection piece 13 of the input terminal 10 is soldered to the input electrode 41,
The connection piece 23 of the output terminal 20 is soldered to the output electrode 42. The ground terminal 30 is bent so that the connection portion 33 is located on the side of the ground electrode 43 of the piezoelectric vibrator 40.
Is soldered to the ground electrode 43. Then, with the gap 50 formed around the piezoelectric vibrator 40, the lead portion
The portion excluding 12, 22, and 32 is covered with a resin layer 60 made of a thermosetting resin or the like.

Next, one embodiment of a method of manufacturing the ceramic filter will be described with reference to FIGS. First, as shown in FIG. 3, one conductive plate is punched,
The input terminal 10, the ground terminal 30, and the output terminal 20 are protruded from the support frame of the lead frame 70 to the same side and are integrally formed on the same lead frame 70. One end of the connection part 33 of the ground terminal 30 is integrally connected to the frame part 11 of the input terminal. Thereafter, as shown in FIG. 4, the connection part 33 of the ground terminal 30 is cut off from the frame part 11 of the input terminal 10, and the ground terminal 30 is bent and formed so that the connection part 33 is located below in the figure. Is fixed to the frame unit 11 and the frame unit 21. Note that one end of the connection part 33 of the ground terminal 30 is connected to the frame part.
By forming the lead frame 70 in a state of being integrally connected to the lead 11, the ground terminal before bending is held at a predetermined position. Next, the piezoelectric vibrator 40 is inserted into the hole 81 of the frame 80.
Then, as shown in FIG. 5, the connection piece 13 of the input terminal 10 is soldered to the input electrode 41, and the connection piece 23 of the output terminal 20 is connected to the output electrode 42.
Solder to Further, as shown in FIG. 6, the lead frame 70 is turned upside down, and the lead portions of the input terminal 10 and the output terminal 20 are connected.
After the connecting portion 33 of the ground terminal 30 is opposed to the ground electrode 43 of the piezoelectric vibrator 40 by bending and reducing the length of the wires 12 and 22, the connecting portion 33 is soldered to the ground electrode 43.

The attachment of the piezoelectric vibrator 40 is performed by input terminals.
This may be performed after the lead portions 12 and 22 of the output terminal 20 are bent and the connection portion 33 of the ground terminal is opposed to the hole 81 of the frame body 80. At this time, the piezoelectric vibrator 40 is connected to the connection pieces 13 and 23 of the input / output terminals 10 and 20 in the holes 81 of the frame 80 and the ground terminal.
It will be inserted between the connection parts 33 of 30. When assembled in this order, the soldering of the input electrode 41 and the connection piece 13 of the piezoelectric vibrator 40, the output electrode 42 and the connection piece 23, and the soldering of the ground electrode 43 and the connection part 33 are performed by reflow soldering. There is an advantage that it can be carried out simultaneously by such means.

After the mounting of the piezoelectric vibrator 40 as described above, for example, the piezoelectric vibrator 40 is coated with wax and then immersed in an exterior molten resin such as DuPont (trademark) of DuPont. The remaining portions except for the lead portions 12, 22, and 32 are covered with a resin layer 60, and the resin layer 60 is further cured by heating, and at the same time, the wax around the piezoelectric vibrator 40 is removed from the porous resin layer 60. And the resin layer 60 is removed by absorption or the like to form a gap 50 between the piezoelectric vibrator 40 and the resin layer 60. And three terminals 10,
By separating the lead wires 20 and 30 from the lead frame 70, a ceramic filter as shown in FIGS. 1 and 2 is completed. The gap
As a method of forming 50, other known means such as using a resin layer 60 that contracts when irradiated with ultraviolet rays can be used. In the above embodiment, the lead frame
In order to facilitate the handling of 70, the tip of the ground terminal 30 is connected to the frame 11 of the input terminal 10, but the tip of the ground terminal 30 is connected to the frame 11 from the beginning when the lead frame 70 is stamped and formed. It may be separated.

[0011]

According to the manufacturing method of the present invention, since the frame is fixed to the frame of the input / output terminal, not only can the mechanical strength of the ceramic filter be increased, but also the application of a void-forming material such as wax. There is an advantage that the amount is easily made uniform.
In addition, since the connection piece integrally formed with the terminal is directly soldered to the piezoelectric vibrator, a highly reliable ceramic filter having a stable connection between the piezoelectric vibrator and the terminal can be obtained. Furthermore, it is easily and continuously assembled on the lead frame,
There is an effect that automation is easy and productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line AA of FIG. 2 showing one embodiment of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a process chart showing a method for manufacturing the ceramic filter.

FIG. 4 is a process chart showing a method for manufacturing the ceramic filter.

FIG. 5 is a process chart showing a method for manufacturing the ceramic filter.

FIG. 6 is a process chart showing a method for manufacturing the ceramic filter.

FIG. 7 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 10 Input terminal 11 ・ 21 Frame part 12 ・ 22 Lead part 20 Output terminal 30 Ground terminal 32 Lead part 40 Piezoelectric vibrator 41 Input electrode 42 Output electrode 43 Earth electrode 80 Frame

Continued on the front page (72) Inventor Minoru Sawada 828, Hinohara, Tamagawa-mura, Hiki-gun, Hiki-gun, Saitama Prefecture Inside the Tamagawa Plant, Toko Co., Ltd. (72) Shinkichi Umezu 828-No. Inside the factory (56) References JP-A-59-212015 (JP, A) JP-A-61-44930 (JP, U) JP-B1-48691 (JP, B2) JP-B-63-28364 (JP, B2) 1) 24978 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) H03H 3/00-3/04 H03H 9/00-9/215 H03H 9/54-9 / 60

Claims (2)

(57) [Claims] 1. A lead part is provided on a substantially L-shaped frame part (11).
(12) an input terminal provided integrally with the connection piece (13) ;
The lead (22) and the connection piece are attached to the substantially L-shaped frame (21).
Output terminal (23) is provided integrally with lead (32)
And one end of the connection portion (33).
Ground end integrally connected to the frame part (11, 21)
Project from the support frame of the lead frame (70) to the same side.
Out and molded into the same lead frame (70),
Connect the ground terminal connection (33) from the frame (11, 21).
Separate and bend the ground terminal to form a hole in the center.
Insert the frame (80) made of square-shaped insulator into the input terminal
Fixed to frame (11) and output terminal frame (21)
After that, the input electrode (41) and the output electrode (42)
And a piezoelectric vibrator with a ground electrode (43) on the back
(80), and insert the connection piece (13) of the input terminal.
Connect the output electrode connection piece (23) to the output electrode
Solder each to (42), then input terminal and output terminal
By bending the lead parts (12, 22) of the
The connection (33) of the ground terminal to the ground electrode (4
After facing 3), connect the connection part (33) to the ground electrode (43).
Of ceramic filter characterized by being soldered to
Manufacturing method . 2. A substantially L-shaped frame portion.(11)To the lead
(12)And connection piece(13)An input terminal provided integrally with
Substantially L-shaped frame(twenty one)To the lead(twenty two)And connection piece
(twenty three)The output terminal and the lead(32)
And one end of the connection portion (33).
Ground end integrally connected to the frame part (11, 21)
Project from the support frame of the lead frame (70) to the same side.
Out and molded into the same lead frame (70),
A frame made of square-shaped insulator with a hole in the center(80)
To the frame part of the input terminal.(11)And output terminal frame
DepartmentAfter fixing to (21), connect the ground terminal connection (33)
Separate from the frame (11, 21) and bend the ground terminal
In addition to molding, lead portions of input and output terminals (1
2, 22) is bent to form a hole in the frame (80).
Make the connection part (33) of the earth terminal face and input electrode on the surface.
(41) and an output electrode (42).
Place the piezoelectric vibrator having 3) in the hole of the frame (80)
After that, connect the connection piece (13) of the input terminal to the input electrode (41).
Connect the connection piece (23) of the force terminal to the output electrode (42 ), Ground terminal
Solder the connection part (33) to the ground electrode (43)
DismissManufacturing method of ceramic filter characterized by the following:
Law.