JPH02242539A - Device package structure of circuit block - Google Patents

Abstract

PURPOSE:To make it certain to easily assemble and hold circuit element between protrusions even if the diameters of the circuit devices are different by making the distance between protrusions a little larger than the maximum tolerance of widths of the circuit elements and deforming the tip of each protrusion by heat. CONSTITUTION:Protrusions 26 to support and fix a resistance device 17 is formed in molding process of a molded substrate 21 in the opposite side to a hole 18. Also, two protrusions 26 are formed on one side of an installation position of a resistance device 17 to be used and one protrusion 26 is formed on the other side and the distance W in width direction of the resistance element 17 between the protrusions 26 are made a little larger than the maximum tolerance of width D of the resistance element 17 and the tip part of each protrusion 26 gradually tapers off. After formation of the protrusions 26, a resistance element 17 is inserted among the protrusions 26 and the tip parts of the protrusions are deformed by heating and the resistance element 17 is nipped and held by the deformed parts 26a and the molded substrate 21. By this way, even if sizes of the circuit elements vary, without cracking and dropping off of circuit elements at the time of assembly, the circuit elements are certainly held in place.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an element mounting structure of a circuit block built into a switch that lights up a display element such as a neon tube when it is off to display the switch location in the dark. It is.

[Prior Art] Fig. 6 shows a cross-sectional view of a so-called barrel switch.
In this switch, a movable contact body 4 is swingably supported by a support protrusion 3 of a conductive metal fitting 2 arranged at the bottom of a device body 1, and the upper half is inserted into a hole 6 provided in a central rib 5a of an operation handle 5. The lower half of the attached coil spring 7 is fitted onto the movable contact body 4, and the coil spring 7 is bent and reversed in response to the reversal operation of the operating handle 5, and the movable contact body 4 is rotated left and right around the support protrusion 3. By this left and right rotation, the movable contact 8 provided on the upper side surface of the movable contact body 4 is moved to the fixed contact 10 provided on the fixed terminal plate 9.
It operates on and off by contacting and separating from the surface.

The fast connection terminal locking fitting 11 or 12 can be connected to the fixed terminal plate 9 or the terminal plate portion 2a of the conductive metal fitting 2 to connect the quick connection terminal 13 or 14.
Configure.

In the figure, when the movable contact 8 and the fixed contact 10 are in contact with each other, the reconnection terminals 13 and 14 are energized, and the switch is turned on.

By the way, this type of switch has a display element 1 like a neon tube that displays the switch position when the switch is turned off.
5 is provided, and the light is illuminated through the lamp cover of the operating handle 5 made of a transparent material. However, the display circuit block built into the conventional switch is as shown in Fig. 7(a)<1). ) As shown in FIG. Hole 1 provided in 16
By inserting the central rib 5a of the operating handle 5 into the opening 8, the operating handle 5 can be attached.

Then, one end of one lead wire 20 of the resistance element 17 is electrically connected to the upper end of the coil splinter 7, and the contact part]9 connected to one end of the display element]5 is connected to the printed circuit board]6.
When the operation handle 5 is turned to the OFF side, one contact portion contacts the upper surface of the fixed terminal plate 9, and the connection terminal 14, the conductive metal fitting 2, the movable contact body 4, the coil spring 7, and the resistance element 17, an energizing circuit is formed for the display element 15, the fixed terminal plate 9, and the connecting terminal 13, so that the display element 5 lights up to emit light.

[Problem to be Solved by the Invention 1] Such a switch incorporates a display circuit block to display the location of the switch in the dark, which is very convenient for the user, but the conventional display circuit block does not. As mentioned above, the resistive element 17 and the display element 15 were connected in series on the printed circuit board 16 by soldering, and each component, especially the resistive element 17, was constructed to stand upright on the printed circuit board 6. However, there was a problem in that it was unstable, vibration was transmitted when the operating handle 5 was turned on and off, and the wire was broken, and assembly was also very troublesome.

Therefore, we used a molded resin board with embedded electrical circuits.
The resistor element is held between the protrusions protruding from the molded board, and the lead wire of the resistor element is soldered to the terminal protruding from the molded board to connect it to the internal circuit. has been proposed, but if the diameter of the resistor element is smaller than the dimension between the protrusions, it cannot be held, and conversely, if the diameter of the resistor element is larger than the dimension between the protrusions, the resistor element is forced between the protrusions. There was a problem in that the resistance element cracked and was damaged when it was inserted.

The present invention has been made in view of the above-mentioned problems, and its purpose is to ensure that even if there are variations in the dimensions of the circuit elements, the circuit elements will not crack, deform, or fall off during assembly. An object of the present invention is to provide an element mounting structure of a circuit block that can hold circuit elements.

[Means for Solving the Problems] The present invention provides a molded substrate made of synthetic resin in which an electric circuit formed by punching a metal plate is embedded, and a circuit element such as a resistor element is disposed therein and connected to the electric circuit. In an element mounting structure of a circuit block in which circuit elements are connected to terminals protruding from a molded board, columnar protrusions with tapered tips are provided on both sides of the circuit elements disposed on the molded board, and The pressure between the protrusions M-j in the width direction on both sides is made slightly larger than the maximum value of the tolerance of the width dimension of the circuit element, and the circuit element between the protrusions is placed between the deformed part where the tip of each protrusion is heated and deformed and the molded substrate. It was retained.

[Function] According to the element mounting structure of the circuit block of the present invention, when the circuit element is assembled between the protrusions, even if the width dimension of the circuit element varies, the circuit element can be easily assembled between the protrusions. There are no problems such as cracking of the circuit elements, and since the circuit elements are held between the heated deformation part at the tip of the protrusion and the molded substrate, they are held securely and will not come off even when subjected to vibrations, etc. This also facilitates fixing work such as caulking and fixing the lead wires of circuit elements, and applying one inch of solder.

[Example] The present invention will be explained below with reference to Example drawings. In an embodiment of the present invention, as shown in FIG. 1, an electric circuit formed by punching a metal plate is inserted inside a molded substrate 21 made of synthetic resin, and a resistance element is provided on one side of the molded substrate 21. 7
Terminals 22 for caulking or soldering the lead wires 20'' of the display element 15 such as neon tubes, and terminals 22a, 2 for caulking and fixing the lead wires 23 and 23 of the display element 15 such as a neon tube, respectively.
21) or 17 protrusions are formed.

In addition, a hole 18 into which the center rib 5a of the operating handle 5 described above is inserted is bored in the center of the upper surface of the molded substrate 2]-, and the upper surface of the molded base 21 on one side of this hole Display element 1
A mounting table 25 for mounting the hole 1 is integrally provided, and the hole 1
A protrusion 26 for holding and fixing the resistor element 17 during the molding process of the molded substrate 21 is integrally provided on the other side of the molded substrate 8 .

Further, a contact portion 27 whose upper surface is covered with a molding material is provided to protrude from the end of the molded substrate 2 on the side where the protrusion 26 is provided. This contact portion 27 corresponds to one conventional contact portion.

4(2) to (C) show the process of forming an electric circuit on the long metal plate 28, in which the long metal plate 28 is wound into a hoop shape.
A thick elongated metal plate 28 is punched out using a punching machine U to form an electric circuit portion in the center, and as shown in FIG. 4(I), the first terminal 22a is formed as an electric circuit. and a first electric path p having a contact portion 27 formed at the other end thereof;
2nd on both ends. The second electric path 12 forming the third other paper 22, 22b is formed, and the terminals 22a, 22 are formed as described above.
The lead wires 23 and 23 of the display element 15 are respectively tightened and fixed to b, and the lead wire 20' of the resistance element 17 is fixed to the terminal 22 by caulking (or if soldering > t, y: the resistance element 17,
A series circuit of the display element 15 and the contact portion 27 constitutes each electric circuit p.

It is formed via p2.

Figures 5 (a) to (c) are electrical circuits as described above! .

Hoop-shaped metal plate 28 rolled up after forming 12
During insert molding, the projections 26 are simultaneously molded by the molding machine V so that the molded substrate 21 covers each of the electric circuits p1 and 42. Here, as shown in FIG. 2(a), two protrusions 26 are protruded from one side of the arrangement position of the resistor element used] 7, and one protrusion 26 is protruded from the other side. (
The dimension W between the protrusions 26 in the width direction of the resistor element 17 shown in b) is slightly larger than the maximum diameter tolerance of the resistor element 17 used, and the tip of each protrusion 2G is tapered. .

After forming the protrusions 26, the resistor element 17 is inserted between the protrusions 26 as shown in FIGS. 2
6 is heated and deformed, and the resistive element 7 is held between the deformed portion 26a and the molded substrate 21.

In this way, the molded substrate 21 is molded, and the metal plate 28 which has been wound up into a hoop shape while holding the resistive element]7 is sequentially sent out, and after the forming process of each terminal 22.22a22b is completed, the resistive element]7 is Fix (or solder) one lead wire 20'' to the terminal 22 at the terminal 7, bend the other lead wire 20'' at a right angle, and then bend the middle part at an angle of about 45 degrees to the resistor element]7. In this way, it can be viewed horizontally. In other words, the tip of this wire 20''' is inserted into the hole 6 of the central rib 5a of the operating huff 1-rule 5.
The coil spring 7 is inserted through a slit (not shown) provided in the switch A, and is connected to the upper end of the coil spring 7 whose upper half is inserted into the nozzle 6 when the switch is assembled.

Now, on the other hand, the display element 15 is connected to the lead wire 20'' of the resistance element 17.
After the bending process is completed, both lead wires 23.23 are caulked and fixed to the terminals 22a, 22b, respectively, and then the lead wires 23.23 are bent and placed horizontally on the mounting table 25.

After the display element 15 has been assembled, each molded substrate 21 portion is separated from the metal plate 28 to obtain a desired display circuit block. At the same time as this separation, the display circuit block is actually assembled into the operating handle 5.

In other words, the display circuit block is completed and assembled through a consistent and continuous assembly process from the state of the hoop material to its assembly into the operating handle 5.

Now, as mentioned above, in order to obtain a display circuit block by cutting the molded substrate 21 from the hoop-shaped metal sheet board 28 and at the same time incorporating the display circuit block into the operation handle 5, the resistive element 17 and the display element 15 are temporarily inserted before cutting. In this case, the resistor 17 is prevented from falling off by integral molding with the protrusion 26, and only one lead wire 20' is fixed to the terminal 22 by caulking or The resistive element 17 can be firmly held on the molded substrate 21 even after soldering.

Next, the operating handle 5 incorporating the display circuit block is installed in the switch body 1 as shown in FIG. and is electrically connected to the lead wire 20'' of the resistive element [7] inserted into the 66, and the contact portion 27 of the molded substrate 2] is disposed on the lower surface of the periphery of the operating handle 5, and is electrically connected to the lead wire 20'' of the resistor The handle 5 can be brought into contact with and separated from the fixed terminal plate 9 in accordance with the operation of the handle 5.

[Effects of the Invention] The present invention provides pillar-shaped protrusions with tapered tips on both sides of the circuit element disposed on a molded substrate, and the distance between the protrusions in the width direction of both sides of the circuit element is adjusted to the width of the circuit element. The dimensional tolerance is slightly larger than the maximum value, and the tip of each protrusion is heated and deformed to hold the circuit element between the protrusions between the slightly deformed part and the molded substrate, so when incorporating the circuit element between the protrusions, Even if the diameter of the circuit element varies, it can be easily assembled between the protrusions, and troubles such as cracking of the circuit element do not occur, and the circuit element is held between the heated deformed part at the tip of the protrusion and the molded substrate. As a result, the circuit elements can be held securely and will not fall off even when subjected to vibrations, etc., making work such as soldering and caulking the circuit elements easier, and also prevents the circuit elements from falling off during process movement. It has the effect of disappearing.

[Brief explanation of drawings]

1 is a perspective view of the present invention, FIGS. 2(a), 2(b), and 2(C) are a partially omitted top view, a partially omitted front view, and a partially omitted side view of the same as above, and FIG. 3 is a partially omitted side view. Cross-sectional views of the switch using the embodiment, FIG. 4 (a>, (b), (c) and FIG. 5 (a,)
, (b) and (c) are explanatory diagrams of the same manufacturing process as above, FIG. 6 is a sectional view of a switch using a conventional example, and FIG. 7<a), (b)
) are a front view and a side view of the same as above. 17 is a resistance element, 21 is a molded substrate, 26 is a projection, 26a
is the deformed part. Agent Patent Attorney Ishi 1) Length 726 is the protrusion 26a is the deformed part Fig. 3 (G) Fig. 2 (b)

Claims (1)

[Claims] (1) Circuit elements such as resistive elements are arranged on a synthetic resin molded board with an electrical circuit formed by punching a metal plate embedded inside, and a circuit is connected to the terminal connected to the electrical circuit and protruded from the molded board. In an element mounting structure of a circuit block that connects elements, columnar protrusions with tapered tips are provided protrudingly on both sides of the circuit elements arranged on the molded substrate, and
The distance between the protrusions in the width direction on both sides of the circuit element is made slightly larger than the maximum tolerance of the width dimension of the circuit element, and the circuit element between the protrusions is placed between the deformed part where the tip of each protrusion is heated and deformed and the molded substrate. An element mounting structure of a circuit block characterized by holding.