JPH02166818A - Electronic parts - Google Patents

Abstract

PURPOSE:To facilitate assembling work by fitting a piezoelectric element in an inner case as holding it at a pair of terminals, and afterwards, putting it in an outer case, and sealing an opening part. CONSTITUTION:A taping piezoelectric oscillator 10 holds the piezoelectric element 1 provided with electrodes 1a, 1b at both its main surfaces by a pair of spring terminals 4, 4. Further, it is fitted in the inner case 2 while it is kept in a state in which it is held by a pair of the terminals 5, 5, and it is stored in the outer case 3 together with the inner case 2, and the opening part of the outer case 3 is sealed by a sealing part 6. Here, the plate thickness of the terminal 5 is set more or less 0.4mm so that a lead part 5a is easy to be cut at the cutting point of an automatic inserting machine. Thus, the holding of the element in the parts and the cutting by the automatic inserting machine are satisfied, and simultaneously, the assembling work becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to electronic components, and more particularly, to improvements in the structure of taping electronic components constituting a series of electronic components such as oscillators and filters.

←Prior Art) Conventionally, as shown in FIG. 17, a taping electronic component constituting an electronic component chain, such as a taping piezoelectric oscillator, has electrodes 101a on both main surfaces.

101a is connected to a pair of terminals 105.
105 is held in the case 103 by its own spring properties, and the opening of the case 103 is closed with a sealant 106 such as synthetic resin.
The lead portions of the terminals 105, 105 are extended to the outside so as to penetrate through the terminals 105, and a pair of supplementary terminals 105a, 105a, which are thicker than the terminals 105, are welded or soldered to the lead portions at point A. It was constructed by having a taping terminal of the dimensions necessary for taping.

The purpose of the electronic parts series consisting of electronic parts for taping configured in this way is to insert various electronic parts into an automatic insertion machine,
For example, it is used to automatically mount products on a board using a radial component insertion machine that is commonly used today, and is an indispensable technology for mass producing products and speeding up work. This radial component insertion machine requires the electronic components for taping to have dimensions of 16 mm or more for the terminal leads, 0.4 mm or more for plate thickness, and 2
In addition, it is necessary that the element body of the electronic component (in this case, the piezoelectric oscillator) be symmetrical about the lead part of the terminal (in this case, the long terminal 105a).

The reason why the long terminal 105a was joined at point A is for the above reason. By using a long terminal that is thicker than the terminal 105, the cutting part B by the radial component insertion machine can be cut at 0.4 mm, which is just the right size for cutting. The thickness of the plate is set to approximately

Therefore, why did we set the terminal 105 at 0, which is convenient for cutting, from the beginning?
．． There is a problem of having a plate thickness of about 4 mm.

This is because when the thickness of the terminal 105 reaches 0.4 mm, it becomes difficult to hold the piezoelectric element 101 with appropriate elasticity and pressure. This is because the elasticity of the terminal 105 tends to fluctuate due to physical shock, etc., and defects such as element cracking or the electrode 101a being scraped by the protrusion of the terminal 105 often occur. Therefore, the optimum thickness of the terminal 105 is about 0.1 mm in order to obtain appropriate elasticity.

For these various reasons, the conventional piezoelectric oscillator for taping has a structure as shown in FIG. 17.

However, in the piezoelectric resonator for taping having the above structure, the long terminals 105a must be joined by soldering and welding in order to make the terminals 105 have the dimensions necessary for taping, and therefore a joining process is required. terminal 105
and the long terminal 105a are connected in a state where they are misaligned, or
Incomplete bonding was often observed, which could lead to poor cutting or mounting when placed in an automatic insertion machine. In addition, since a joining process is required, work efficiency is poor.
This led to an increase in costs.

Furthermore, although this overlaps with the previous point, using a terminal with a lead part of the size required for taping in advance means that if you use a terminal with a plate thickness of about 0.4 mm with emphasis on cutting with an automatic insertion machine, it will be easier to cut inside the part. If emphasis is placed on retaining the piezoelectric element, problems will arise with cutting using an automatic insertion machine, so omitting the bonding process, cutting with an automatic insertion machine, and retaining the piezoelectric element inside the component are all satisfactory. There was a problem that it was not an electronic component for taping.

Therefore, the inventor of the present application devised Utility Model Application No. 144008/1983 in order to solve the above problem. This invention is shown in FIG. 16, and includes a first terminal 94.94 having spring properties that press and hold an element 91 having electrodes 91a, 91a on both main surfaces. A second lead portion having a predetermined length necessary for taping 94.
The terminal 95.95 is held in the case 93, the opening is closed with a sealant 96, and the lead portion 95a95a of the terminal 95.95 is pulled out to the outside so as to pass through the sealant 96. It is characterized by being an electronic component for taping. According to this invention, the joining process of welding or soldering a long terminal to the lead part of the terminal to obtain the dimensions necessary for taping can be omitted, and the lead part 9 of the terminal 95 can be used as a taping terminal with good dimensional accuracy.
5a can now be obtained, and the taping electronic component can satisfy both the holding of the element 91 inside the component and the cutting of the taping terminal, that is, the lead part 95a of the terminal 95 by an automatic insertion machine. We are now able to provide parts.

(Problems to be solved by the invention) By the way, Utility Application No. 1440, 1983, devised by the inventor of the present application
No. 08 was structurally sufficient to solve the various problems of the prior art, as described above. However, the assembly work was difficult and very time-consuming.

For example, in the taping piezoelectric oscillator shown in FIG. The external dimensions of the component element are made smaller than the internal dimensions of the case by pressing from the outside of the case, but the piezoelectric element 91 and the spring terminal 94 are only in contact at a point close to each other, and the piezoelectric element 91° or Spring terminal 9
There was a problem in that the spring terminal 94 could not be properly stored because it would fly off due to the spring pressure generated in the spring terminal 94. Also, even if it is stored, the piezoelectric element 9°
There was a possibility that the vibration node point of No. 1 and the holding portion of the spring terminal 94 were misaligned, resulting in a piezoelectric oscillator with poor characteristics.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the invention of Utility Application No. 144008/1983, the present invention provides a pair of spring-like elements that press and hold an element having electrodes on both main surfaces. An electronic component having a first terminal, the first terminal being held by a second terminal having a lead portion having a length necessary for taping, and housed in a case, and the opening thereof being sealed. In this step, the element having electrodes on both main surfaces, the first terminal, and the second terminal are fitted into a first case, which is an inner case having a hollow part, and then stored in a second case, which is an outer case. The second case is characterized in that the opening of the second case is sealed.

(Function) An electronic component for taping that satisfies the retention of elements inside the component, cutting by an automatic insertion machine, and omits the process of joining terminals for taping, which is easy to assemble and has a position to hold the element when stored in a case. It is possible to provide an electronic component for taping that hardly shifts.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a piezoelectric oscillator for taping using an embodiment of the present invention. This piezoelectric oscillator 10 for taping is constructed by holding a piezoelectric element 1 having electrodes 1a and la on both main surfaces with a pair of spring terminals 4, 4, and holding it with a pair of terminals 5, 5 inside. It is fitted into a case 2, housed together with the inner case 2 in an outer case 3, and the opening of the outer case 5 is closed with a sealant 6.

The piezoelectric element 1 is a piezoelectric resonant element in which electrodes are applied to the entire surface on both main surfaces, and the row spring terminals 4, which exhibit spreading vibration, are made of a spring material such as phosphor bronze by press processing, as shown in FIGS. 13 and 14. The piezoelectric element 1
'I: Has a protrusion 41 that is held electrically and mechanically. The thickness of the spring terminal 4 is set to about 0.1 mm, so that the piezoelectric element 1 can be held with appropriate elasticity. Further, a recess 42 is formed near the center of each side of the spring terminal 4. This is to prevent the spring terminal 4 from rotating due to mechanical shock or the like, or from moving the holding point of the protrusion 41 from the vibration node point of the piezoelectric element 1. It is adapted to fit into the convex portion.

As shown in FIGS. 11 and 12, the terminal 5 consists of a flat plate portion 51 and a lead portion 5a. The flat plate portion 51 is provided with four rotation-stopping recesses near the center of each side, and is adapted to fit into a convex portion provided on the inner case 2 similarly to the spring terminal 9 described above. The thickness of the terminal 5 is set to about 0.4 mm, so that it can be easily cut at the cutting point of the automatic insertion machine of the lead portion 5a. The terminal 5 is made of a material that is relatively inexpensive and has good conductivity, such as iron or brass. Further, at the position where the lead portion 5a extends from the flat plate portion 51, the lead portion 5a is formed by forming two lead portions 5a156.
In order to make the terminals parallel to each other as taping terminals, and by bringing the lead portion 5a into contact with the inner wall surface of the outer case 3,
This is to stabilize the holding of the terminal 5.

The inner case 2 is shown in Figs. 3, 4, 5, and 6.

As shown in FIG. 7, it has a frame shape with a hollow portion made of synthetic resin or the like. Each of the surfaces 21, 22, 23 and 24 has a trapezoidal convex portion 21a on the inner surface side.

22a, 23a, and 24a are provided. These trapezoidal convex portions are the spring terminals 4 described above. Recess 42 of terminal 5
, 52, respectively, and hold the piezoelectric element 1.
The piezoelectric element 1 has a function of maintaining a position where the vibration of the piezoelectric element 1 is relatively small so that it does not rotate. Furthermore, the reason why these convex parts are trapezoidal is that it is easy to fit the components into the inner case 2, and the leads of the terminals 5 are placed on the 0 surface 23 where both ends of the trapezoidal shape serve as tapers. Groove 23b for pulling out part 5a
.

23b are provided at diagonal positions. Also, on side 24,
There are two recesses 24b at the upper end and two recesses at the lower end into which the projections 31 of the outer case 3, which will be described later, fit. This recess 2
The shape of 4b is determined by the mutual relationship between the shape and the convex portion 31.

As shown in FIGS. 8, 9, and 10, the outer case 3 is a housing made of synthetic resin or the like and having an opening 32 on only one side. The opening 32 is provided with a gentle taper 33 so that the inner case 2 described above can be easily accommodated therein. The inner wall surface of the outer case 8 is provided with four protrusions 31 that fit into the recesses 24b of the inner case 2 described above. This convex portion 31
By fitting into the concave portion 24b of the inner case 2, it presses the component elements housed in the inner case 2 and functions to electrically and mechanically hold the component elements together. Convex portion 31
A taper 31a is provided on the opening side,
It is easy to fit into the recess 24b of the inner case 2, and it is easy to press and store the components housed in the inner case 2.

The convex portions 31 are provided at four locations in FIG.
The number may be more than that, and is set depending on the mutual relationship with the recess 24b of the inner case 2.

Here, a method of assembling the taped piezoelectric oscillator 10 will be explained.

What is shown in FIG. 15 is a piezoelectric element 1 in the inner case 2.
, the procedure for fitting the spring terminals 4, 4 and terminals 5, 5. First, the terminal 5 is fitted into the inner case 2 from the back side so that its lead portion 5a passes through the recess 23b. Next, the spring terminal 4, the piezoelectric element 1, and the spring terminal 4 are housed in the inner case 2 in this order so that the piezoelectric element 1 is held by the projections 41, 41 of the spring terminal 4.4. Finally, cover with the terminal 5, and fit the lead portion 5a into the recess 23b. Convex portions 21a, 22a, 23a of inner case 2.

24a is the fourth part 42 of the spring terminal 4. Recess 5 of terminal 5
2 with a predetermined margin.

FIG. 2 shows the above state, that is, the state in which the inner case 2 into which the components and elements are fitted is housed in the outer case 3. As described above, the convex portion 31 of the outer case 8 and the concave portion 24b of the inner case 2 are fitted through the taper 33 provided so that the outer case 3 can easily accommodate the inner case 2. In this case as well, the convex portion 31 is provided with a taper 31a to ensure smooth fitting. At that time, since the external dimension L1 of the component element is larger than the internal dimension L2 of the outer case 3, the convex portion 31
The spring terminals 4, 4 are pressed by the spring terminals 4, 4, and spring pressure is generated in the spring terminals 4, 4, thereby bringing the component elements into pressure contact with each other. Finally, a sealant is filled to cover the end face of the inner case 2 and the forming part of the terminal 5 (see FIG. 1), and the assembly is completed.

The above is an embodiment of the taping electronic component of the present invention, but it goes without saying that the design can be changed without departing from the spirit of the present invention.

(Effects of the Invention) As described above, the present invention has a first terminal plate having a spring property that presses and clamps an element provided with electrodes on both main surfaces, and the first terminal plate is used for taping. In an electronic component that is held by a second terminal having a long lead portion and housed in a case with the opening sealed, the element has electrodes on both main surfaces, and a pair of first terminals. An electronic component in which a plate and a pair of second terminals are fitted into a first case, which is an inner case having a hollow part, and then stored in a second case, which is an outer case, and the opening of the second case is sealed. This is suitable for holding the element and cutting the terminal lead part using an automatic insertion machine, and since the terminal lead part already has the length necessary for taping, the joining process of attaching the long terminal to the terminal lead part is suitable. It is possible to provide an electronic component for taping that can be omitted. Furthermore, the size of the parts is almost the same as conventional ones, and it is easy to assemble, and the vibration node of the element and the protrusion of the terminal do not slip or slip during assembly, and there are extremely few characteristic defects. We can provide parts.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of an embodiment of the taping electronic component of the present invention. FIG. 2 is an exploded view of an embodiment of the taping electronic component of the present invention. FIG. 3 is a top view of an example of an inner case used in the present invention. FIG. 4 is a side view of an example of an inner case used in the present invention. FIG. 5 is a front view of an example of the inner case used in the present invention. FIG. 6 is a bottom view of an example of the inner case used in the present invention. FIG. 7 is a perspective view of an example of an inner case used in the present invention. 8th
The figure is a front view of an example of an outer case used in the present invention. FIG. 9 is a side view of an example of the outer case used in the present invention. FIG. 10 is a bottom view of an example of the outer case used in the present invention. FIG. 11 is a front view of an example of the second terminal used in the present invention. FIG. 12 is a side view of an example of the second terminal used in the present invention. FIG. 18 is a front view of an example of the first terminal used in the present invention. FIG. 14 is a side view of an example of the first terminal used in the present invention. FIG. 15 is a partial assembly process diagram of an embodiment of the present invention. 1st
FIG. 6 is a side sectional view of a conventional taping electronic component. FIG. 17 is a side sectional view of a conventional taping electronic component. 1...Element 2...Inner case 3...Outer case 4...Spring terminal 5...Terminal 6...Sealant 1a...Electrode 5a...Lead part

Claims (1)

[Scope of Claims] There is a pair of first terminals having spring properties that press and hold an element having electrodes on both main surfaces, and the first terminals have a length necessary for taping. The electronic component is housed in a case while being held by a pair of second terminals having lead portions, and the opening is sealed, the element having electrodes on both main surfaces, and the pair of first terminals. , an electronic component in which the pair of second terminals are fitted into a first case, which is an inner case having a hollow portion, and then housed in a second case, which is an outer case, and the opening of the second case is sealed. .