JPH02242538A - Structure of circuit block - Google Patents

Abstract

PURPOSE:To make soldering process unnecessary and lower the production cost by carrying out bending process of a supporting spring just before assembly of a circuit device depending on an open part formed in a substrate. CONSTITUTION:A device installation part 30 is so formed integrally in a molded substrate 21 as to correspond to the central part of a pair of holding springs 2 3 and open parts 31 are formed in a molded substrate 28 in the both outside ends of the device installation part 30 and opened along with each holding piece 23b. Owing to the open parts 31, supporting springs 23 can be bending- processed just before assembly of a circuit device so that qualities of the holding pieces 23b and supporting pieces 23a are stabilized and moreover holding and connecting the circuit device are carried out by the holding springs 23 and holding pieces 23b so that soldering process becomes unnecessary. As a result, installations for soldering is also unnecessary and production cost can be lowered.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the 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 indicate the location of the switch in the dark. .

[Prior Art] FIG. 9 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 placed at the bottom of the device body 1, and the upper half is inserted into a 66 provided at a central ridge 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 reversing operation of the operating handle 5, and the movable contact body 4 is moved left and right around the support protrusion 3. The movable contact 8 provided on the upper side surface of the movable contact body 4 changes to the fixed contact 10 provided on the fixed terminal plate 9 by this rotation to the left or right.
It operates on and off by contacting and separating from the surface.

The connecting terminal lock 911 or 12 is 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 connection terminals L3 and 14 are energized, and the switch is turned on.

However, this type of switch has a display element like a neon tube to display the switch position when the switch is turned off]
5 is provided, and the light is illuminated through the lamp cover of the operation handle 5 made of a transparent material. However, the display circuit block built into the conventional switch is the 10th one.
As shown in Figures <a> and (b), the display element 15 and the current-limiting resistor element 17 are connected in series to the printed circuit board 16 by soldering and wired in advance to form a block. It is attached to the operating handle 5 by inserting the central rib 5a of the operating handle 5 into the hole 18 provided in the opening 16.

Then, one end of one lead wire 20 of the resistance element 17 is electrically connected to the upper end of the coil spring 7, and one contact portion connected to one end of the display element 15 is connected to the printed circuit board L6.
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 15 emits light.

This type of switch is very convenient for the user because it can display the location of the switch in the dark by incorporating a display circuit block, but the conventional display circuit block is not connected to the board 1 as described above. The resistance element 17 and the display element 15 were connected in series by soldering, and each component was constructed so that the resistance element 17 stood upright on the printed circuit board 16. There was a problem in that vibrations were transmitted and the wires broke when the switch was turned on and off, and assembly was very troublesome.

Therefore, a molded substrate 2] as shown in FIG.
is held on a molded substrate 21 by a molded holder 26, and the lead wire 20' of the held resistance element 17 is soldered to a terminal 22 protruding from the molded substrate 21 to connect it to the internal electrical circuit. has been done. FIG. 12 shows a cross section of a switch incorporating the display circuit block of FIG. 11.

[Problems to be Solved by the Invention] However, the structure shown in FIG. 11 requires a process of soldering the 20° lead wire of the resistor element 17, which requires equipment for the soldering process, which reduces production accordingly. There was a problem that the cost was high.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a circuit block that can improve assembly ease and quality, and also reduce production costs by reducing equipment. It is in.

[Means for Solving the Problems] The present invention punches out a hoop-shaped metal plate to form an electric path, forms a synthetic resin molded substrate in which the formed electric path is embedded by insert molding, and adds resistance to the molded substrate. In a circuit block in which a circuit element such as an element is arranged, an opening that passes through the upper and lower sides of the molded board is provided on the upper surface and both ends of the molded board, and on both ends of the open element placement part and at least on one side of the molded board, A support piece with one end protruding from the inner circumferential surface of the opening provided in the molded substrate on at least one side of the outer side of the element placement part and having an extended tip extending below the element placement part; A pair of retaining springs, each consisting of a retaining piece extending in the opposite direction to the element arranging part on an extension line connecting both ends of the element arranging part and facing below an opening provided outside the end of the element arranging part, are attached to the element arranging part. Each holding piece is provided at both ends, and each holding piece is made to stand vertically at both ends of the element placement portion, and the holding piece is brought into elastic contact with the electrodes at both ends of the circuit element that is incorporated in the element placement portion to hold the circuit element. It is electrically connected to the

More specifically, in the invention as claimed in claim 2, the retaining spring is formed in an E shape so that the middle leg piece is used as the retaining piece, and both side leg pieces are formed.
A supporting piece is made up of a connecting piece that connects both side foot pieces and a middle foot piece,
Openings are provided in the molded substrate on both sides of the element placement section so as to correspond to the legs on both sides of the support piece.

In addition, in the invention as claimed in claim 3, the holding spring is formed into a U shape, and the L part thereof is used as a support piece, and the piece integrally connected to the tip of this L part is used as a holding piece, which corresponds to the support piece in the section (■). An opening is provided in the molded substrate on one side outside the element placement section.

In the invention as set forth in claim 4, the support piece and the holding piece are arranged in series at right angles to form a holding spring, and an opening is formed in the molded substrate on one side outside of the element arrangement portion so as to correspond to the supporting piece. It is set up.

In the invention as claimed in claim 5, the holding spring is formed in a T-shape, the horizontal piece is used as a supporting piece, the vertical piece is used as a holding piece, and one side of the outer side of the element arrangement part is formed so as to correspond to both ends of the supporting piece. An opening is provided in the molded substrate.

[Function] According to the structure of the circuit block of the present invention, the holding spring can be bent immediately before the circuit element is assembled due to the presence of the opening provided in the molded substrate, and therefore the holding piece and the supporting piece can be bent. The quality of the bent part is stable, and since the retaining piece of the retaining spring holds the circuit element and makes the finished connection, no soldering process is required, and therefore no soldering equipment is required, reducing production costs. This can be reduced. Furthermore, the length from the base end of the support piece to the holding piece can be increased within a limited space, and as a result, the amount of deflection of the holding spring can be increased, resulting in excellent spring characteristics of the holding spring. This provides high workability and high reliability in holding the element.

[Example] The present invention will be explained below with reference to the drawings.

FIGS. 1(a) to (c) show the process of forming electric circuits on the long metal plate 28. As shown in FIG. 1, the punching machine U shown in FIGS. 1(b) and 1(c) is used to cut the electrical circuit portion, the holding spring 23 of the resistive element 17, the terminal 25a for fixing the lead wire 24 of the display element 15 by caulking, etc. It is designed to be formed by punching.

FIG. 2 shows an enlarged top view of a punched part of the metal plate 28, in which a round hole 18a corresponding to the hole 18 is opened in the center of the part corresponding to the display circuit block; On both sides of 8a, there are punched outline shapes of a pair of holding springs 23 for holding the resistance element 17, and outline shapes 25 of terminals 25a and 25b for caulking and fixing the lead wires 24 of the display element 15. is punched out.

Here, each holding spring 23 is formed in an E-shape, and the connecting piece that connects both side legs to each other constitutes a supporting piece 23a, and the central leg constitutes a holding piece 23b, and the supporting piece 23a Both ends of the holding piece 231 are integrally connected to the electric circuit pieces of the metal plate 28, and the tip of the holding piece 231 is not separated from the metal plate 28. Further, the terminals 25a and 25b are processed and formed into a general shape 25 without being separated. The pair of retaining springs 23 are formed line-symmetrically so that the connecting pieces constituting a part of the supporting piece 23a are placed back to back, and each retaining piece 23b is arranged on the same straight line, with the tips thereof facing in opposite directions. I'm aiming.

Next, FIGS. 3(a) to (c) show broken electrical circuits and
This figure shows a step of insert molding using a molding machine V so that each electric circuit piece portion of the hoop-shaped metal plate 28 wound up after forming the holding spring 23 and the terminals 25a and 25b is covered with a molded substrate 21.

FIGS. 4(a) to 4(c) show half of the display circuit block after insert molding, in which the pair of retaining springs 23 described above are shown.
The element placement portion 30 is placed on the molded substrate 2 so as to correspond to the center portion of the molded substrate 2.
1, and openings 31 are provided in the molded substrate 28 on both sides of the element placement portion 30, and openings are provided along the respective holding pieces 23b. Here, the element placement section 30 has both ends and a top opening open, and the base of the holding piece 23b is arranged below the bottom, and the opening 3]
The end portions of the support pieces 23a are arranged at the inner circumferential surface of the opening 31, and the ends of the support pieces 23a are placed closer to the molding device body 21.
inserted inside.

Next, in the process immediately before assembling the resistance element 17 and the display element 15, as shown in FIG.
In addition to separating and bending unnecessary connection points,
The unnecessary connection parts of the terminals 25a and 25b are separated and bent. When bending the supporting piece 23a, a punch die is inserted into the upper and lower opening surfaces of the opening 31 using the opening 31, and the vicinity of both ends of the supporting piece 23a are bent downward to stand the supporting piece 23a. By bending the support piece 23a, the holding piece 23b also stands vertically. The vertical holding pieces 23b facing each other are further bent into a dogleg shape so that the bent convex portions face each other.

On the other hand, the terminals 25a and 25b are formed parallel to each other, and their respective bases are bent upward to face obliquely upward, and caulking pieces are integrally formed on both side edges of their tips.

However, the resistive element 17 and the display element 15 are later incorporated into the folded joint made in this way.
＞ is a resistive element 17 having a cylindrical shape and having electrodes 17a at both ends.
The resistor element 17 is shown mounted in the element arrangement section 30, and the resistance element 17 is mounted between the vertical walls 30a erected on both sides of the element arrangement section 30. The electrode 17a is press-fitted against the spring force between the electrodes 17b and 23b, and the electrode 17a is brought into elastic contact with the holding piece 23b by the spring force of the holding piece 23b, thereby electrically connecting the resistor element 17 and mechanically holding it. Here, since the length of the holding spring 23 from the base end of the supporting piece 23a to the holding piece 23 can be made longer, the amount of deflection of the holding spring 23 can be increased in a limited space. Excellent spring properties and workability can be obtained.

In the display element 15, the lead wires 24 are caulked and fixed by the caulking pieces of the terminals 22a and 25b, and the lead wires 24
is bent and placed on the vertical wall 30a of the element placement section 30.
It is mounted as shown in Figure (b).

FIG. 7 shows a perspective view of a state in which the resistive element 17 is not incorporated.

In this way, the molded substrate 28 is molded, and the resistance element 17,
The hoop-shaped metal plate 2 holding and fixing the display element] 5 is sent out in sequence, and each display circuit block is attached to the hoop-shaped metal plate 28.
More divided.

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.

Although the retaining spring 18 in the above embodiment is formed in an E shape, it may also be formed in a U shape, an L shape, or even a T shape as shown in FIGS. 8(a) to (C). Good, Figure 8(a)
In the case where the support piece 23a is cantilevered as shown in FIG. 3B, an opening 31 for use in bending may be provided in the molded substrate 1 on one side outside the element placement portion.

[Effects of the Invention] As described above, the present invention punches out a hoop-shaped metal plate to form an electric path, forms a synthetic resin molded substrate in which the formed electric path is embedded by insert molding, and inserts the formed electric path into the molded substrate. In a circuit block in which circuit elements such as resistive elements are arranged, an opening that passes through the upper and lower sides of the molded board is provided on the upper surface and both ends of the molded board, and on both ends of the open element arrangement part and at least on one side of the molded board. , a support piece having one end protruding from the inner circumferential surface of the opening provided in the molded substrate on at least one side of the outer side of the element placement part and having an extended tip extending below the element placement part; A pair of retaining springs each consisting of a retaining piece extending in the opposite direction to the element arranging part at an extension line connecting both ends of the arranging part and facing below an opening provided outside the end of the element arranging part; Each holding piece is provided at both ends of the element arrangement part, and each holding piece is made to stand vertically at both ends of the element arrangement part, and the holding pieces are brought into elastic contact with the electrodes at both ends of the circuit element introduced into the element arrangement part. Since the circuit elements are held and electrically connected to each other, the openings provided in the molded substrate make it possible to bend the holding springs immediately before assembling the circuit elements. The quality of the parts is stable, and since the circuit elements are held and connected using the holding pieces of the holding spring, there is no need for soldering in the process.Therefore, no equipment for soldering is required, reducing production costs. In particular, the length between the base end of the support piece and the holding piece can be made longer, and as a result, there is more leeway in the amount of deflection of the holding spring, and excellent spring characteristics and workability can be obtained. Moreover, there is an effect that high reliability in holding the element can be obtained.

[Brief explanation of drawings]

FIGS. 1(a) to (C) are explanatory diagrams of the punching process of a metal plate according to an embodiment of the present invention, FIG. a) ~ (C)
Figure 4 is an explanatory diagram of the molding process of the molded substrate of same-L.
4(a) is an enlarged top view, partially omitted, of the molded substrate same as above after the molding process, and FIG. , Fig. 4(C) is an enlarged cross-sectional view of the above molded board after the molding process, and Fig. 5(a) is a partially omitted enlarged cross-sectional view of the same molded board after the molding process. The omitted enlarged top view, Fig. 5 (1)) is a partially omitted enlarged side cross-sectional view after bending the retaining spring and terminal, and Fig. 6 (a) shows the elements of the above with the resistor element installed. FIG. 6(b) is an enlarged side sectional view of the main part of the same display element in an assembled state, FIG. 7 is a perspective view of the main part of the same as above, and FIGS. 8(a)(b) )(C) is an explanatory diagram of the configuration of a retaining spring according to another embodiment of the present invention, FIG. 9 is a sectional view of a switch using a conventional example, and FIGS. 10(a) and (1)) are front views of the same as above. , a side view, FIG. 1-1 is a perspective view of another conventional example, and FIG. 12 is a sectional view of a switch using the same. 17 is a resistance element, 21 is a molded substrate, 2B is a holding spring, 2
3a is a support piece, 23b is a holding piece, and 31 is an opening. Agent Patent Attorney Ishi 1) Long 7th 6th (G) (b) Figure 7 In Figure 7, the resistance element 1 is the molded substrate 3, the holding spring 3a is the support piece 3b, the holding piece 1 is the opening ■

Claims (5)

[Claims] (1) A hoop-shaped metal plate is punched out to form an electric path, and the formed electric path is embedded by insert molding to form a synthetic resin molded substrate, and circuit elements such as resistive elements are arranged on the molded substrate. In the circuit block, an opening that passes vertically is provided in the molded substrate at both ends and at least on one side of the element placement section, which is formed in the molded substrate and has an open top surface and both ends. a support piece having one end protruding from the inner circumferential surface of the opening provided in the molded substrate and having an extended tip extending below the element placement portion;
It consists of a holding piece that extends from the tip of the supporting piece in the opposite direction to the element arranging part on an extension line connecting both ends of the element arranging part, and faces below the opening provided outside the end of the element arranging part. A pair of holding springs are provided at both ends of the element placement section, and each holding piece is made to stand vertically at both ends of the element placement section, and the holding pieces are attached to the electrodes at both ends of the circuit element in which the circuit element is incorporated in the element placement section. A structure of a circuit block characterized by holding circuit elements in elastic contact and electrically connecting them. (2) The holding spring is formed into an E shape, and the middle leg piece is used as a holding piece, and the leg pieces on both sides and the connecting piece that connects the leg pieces on both sides and the middle leg piece are used as supporting pieces, and the legs on both sides of the supporting piece are 2. The structure of a circuit block according to claim 1, wherein openings are provided in the molded substrate on both sides of the element placement section so as to correspond to the openings. (3) The holding spring is formed into a U shape, and the L part thereof is used as a support piece, and the piece integrally connected to the tip of this L part is used as a holding piece, and the element placement part is arranged so as to correspond to the support piece of the L part. 2. The structure of a circuit block according to claim 1, wherein an opening is provided in the molded substrate on one outer side. (4) The support piece and the holding piece are connected at right angles to hold the holding spring L.
2. The structure of a circuit block according to claim 1, wherein the circuit block is formed into a shape and an opening is provided in the molded substrate on one side outside the element placement portion so as to correspond to the support piece. (5) The holding spring is formed into a T-shape, the horizontal piece is used as a supporting piece, the vertical piece is used as a holding piece, and an opening is formed in the molded substrate on one side outside of the element placement area so as to correspond to both ends of the supporting piece. 2. The circuit block structure according to claim 1, further comprising a circuit block.