JPS6282624A - Surface mount type electric switching apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

<Field of the Invention> The present invention relates to a surface-mounted electrical switching device that is applied to contact relays, switches, etc., and is directly fixed to the surface of a wiring board. <Prior art and its problems> In this type of equipment, it is desirable to have a high packaging density on the wiring board. For this reason, the tip side of a lead terminal that is led out from the device body and brazed to the wiring board with solder or the like is bent inward into an L shape. However, with conventional terminals, the surface mount terminal is integrated with the main body of the device, so the shape of the terminal affects the manufacturing efficiency, and the brazing material in the brazing part of the L-shaped terminal tends to flow poorly. It is in. In particular, there is a problem in which the brazing temperature is easily affected by the heat at 4 o'clock and the atmosphere under high temperature.For example, the thermal stress generated in the terminal at the brazing part may cause the There is a risk that cracks may occur on the device body side due to fluctuations in the contact gap of the device, or due to differences in thermal expansion coefficients between the circuit board and the device body side during use at high temperatures. This is a surface-mounted electrical switchgear that was developed to solve the problems of the conventional ones mentioned above, and can increase mounting density, ensure reliable wiring, and eliminate adverse thermal effects on the device itself to ensure reliability. The object of the present invention is to provide a surface-mounted electric switchgear that is easy to manufacture. <Structure and Effects of the Invention> The surface-mounted electric switchgear according to the present invention has a distal end curved inwardly and can be directly attached to the surface of a wiring board. A terminal block having a plurality of external terminals attached thereto, and a device main body having a built-in opening/closing contact mechanism and installed on the inner surface of the terminal block, each external terminal of the terminal block and a corresponding device main body side. electrically connect each lead terminal in a loose state with an external terminal or a lead body that is the same as the lead terminal or a separate body, and then connect the external terminal with the resin molded part formed on the terminal block, leaving the external terminal. According to the present invention, since the external terminals of the terminal block are curved inward, the packaging density is increased, and the brazing material can be easily circulated during soldering. Furthermore, thermal stress during soldering can be dispersed by the curved part.In particular, the terminal block and the device body are constructed separately, and the connection between the external terminal on the terminal block side and the lead terminal on the device body side is in a loose state. Because it is made of solid wood, thermal stress on the terminal block side can be reliably absorbed at the connection part and prevented from being transmitted to the contacts on the device body side.
Therefore, the operation can be stabilized. Furthermore, since the main body of the device is covered with a resin mold,
Not only is the occurrence of cranks caused by heat prevented, but the vibration resistance is also enhanced compared to something that is simply covered with a cover or the like. Furthermore, since the terminal block can be molded separately from the device main body, productivity is improved. <Description of Examples> Examples of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are an external perspective view showing an example of a polarized relay to which a surface-mounted electrical switching device according to the present invention is applied, and a plan view showing an internal configuration, respectively. In the figure, this polarized relay is roughly divided into a terminal block 100, a relay main body 200 set on the terminal block 100, and a resin molded part 300. The terminal block 100 includes a rectangular electrically insulating base 101
and a plurality of external terminals 60 (60+ to 604) arranged in parallel on both ends of the base body 101 in the width direction, and the tip side 60a of each external terminal 60 is curved inward in the width direction of the base body in an arc shape. has been done. 101a is a protrusion formed on the outer surface of the base body 101 corresponding to the curved portion 60a of the external terminal 60; This is to prevent indentation deformation due to As o a. On the other hand, the relay main body 200 is roughly divided into an electromagnet block A, a movable block B, as shown in FIGS. 2 and 3.
It is composed of a contact mechanism C, a case l, and a terminal base 2. 'tji The 81-stone block A has a coils boules 3 made of synthetic resin and an upright protrusion 4c at the front and rear ends. 4d and the center hole 3 of the spool 3.
It is composed of a rod-shaped iron core 5 that is fitted into a. The tip of the iron core 5, which becomes the magnetic pole portion 5a, protrudes from one end flange portion 3b of the spool 3 around which the electromagnetic coil 12 is wound. Further, a coil terminal 20 is set by insert molding on a terminal support portion 3e projecting from the flange portion 3C at the other end of the spool 3. The spool 3 is locked to the yoke 4, and the base end of the iron core 5 is fitted into the recess 4e of the rear end upright protrusion 4d of the yoke 4 and fixed by caulking. is fixed in place. Further, the coil terminal 20 is connected to the external terminal 8 of the terminal base 2.
It is brazed and connected to the inner end 6a of 1 with solder 21. A support shaft 7 is protruded from the upper surface of the terminal base 2, and a frame-shaped movable insulating stand 8 forming a movable block B.
A support shaft 7 is fitted into the shaft hole 8a and is rotatably supported. the above

[On the tip of the 1re insulating stand 8 are fixed a pair of iron leaves 9 and 10 that are arranged opposite to each other, and a permanent magnet it that magnetically connects these iron leaves 9 and 10. There is. Further, the iron core 9 is placed between one of the shingle magnetic plates 13 set on both sides of the magnetic pole part 5a of the iron core 5 and the front end upright protrusion 4C of the yoke 4, and the other iron piece 10 is placed between the other shingle magnetic plate 13 set on both sides of the magnetic pole portion 5a of the iron core 5. They are arranged opposite to each other on the plate 14. On the other hand, the contact mechanism C is set on both sides of the terminal base 2, and has the movable contact 15 and the inner end 6b of the fixed terminal piece 62.
A movable contact piece 17 supported in a cantilevered state and a fixed contact 1
8.19 at the inner end 6c. The movable contact piece 17 is inserted into a groove 8C of a card portion 8b projecting from the tip of the movable insulating table 8. The above case 1 is molded by mixing white powder such as TiO2 with a transparent synthetic resin such as epoxy resin, and is then fitted onto the terminal base 2, and is attached to the electromagnetic block A on the terminal base z and the movable block. B and contact mechanism C are coated. Each lead terminal 6 (61 to 61) in the relay main body 200
64) and each external terminal 60(
60, ~ 604) is connected to the flexible lead wire 2.
2 (22+ to 224). The resin mold part 300 is low-pressure molded on the terminal block 100 except for the external terminal 60,
The entire relay main body 200 is covered with this molded part 300. As the resin for the resin mold section 300, a resin having good adhesion to metal, such as an epoxy resin, is suitable. When using the relay with the above configuration, each tip 60a of the external terminal 60 in the terminal block 100 is temporarily attached to the brazing material of the printed wiring board M shown in FIG. 4 with solder paste or the like, and then passed through a heating furnace. , during this passage, the brazing material 23 of the printed wiring board M is melted to form the external terminal 6.
0 is brazed. Next, the operation of the above configuration will be explained. FIG. 2 shows the neutral state, and in the returned state, the magnetic flux of the permanent magnet 1 forms a loop passing through the iron piece 10, the iron core 5, the yoke 4, the upright protrusion 4C, and the iron piece 9. As a result, the iron piece 10 is attracted to the magnetic pole portion 5a of the iron core 5 via the magnetic plate 14, and the movable block B is held at the return position. At this time, as the movable block B moves in the direction of arrow a in FIG. 2, the movable contact piece 17 is deflected, and the movable contact 15 comes into contact with the fixed contact 18. In this state, when the coil 12 is excited, a magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnet 11 is generated in the coil 12, and the iron piece 9 is attracted to the magnetic pole portion 5a of the iron core 5 via the magnetic plate 13. That is, by moving the movable block B in the direction of the arrow in FIG. 2, the movable contact 15 switches to and contacts the fixed contact 19. In the state shown in FIG. 2, when the excitation of the coil 12 is released, the movable block B moves as indicated by the arrow a.
Return in the direction of. Here, each external terminal 6 in the terminal block 100 is in a state where the relay described in "2" is attached to the printed wiring board M.
Since the tip side 60a of 0 is curved inward,
Packaging density can be increased. Furthermore, when soldering to the printed wiring board M, the solder 23 creeps up on both rising sides of the curved portion 60a, making it easy to go around the entire circumference, resulting in good soldering. Further, due to the heat of the soldering, the external terminal 60 is deformed using the curved portion 60a as a support.
i can absorb thermal stress. In particular, the terminal block 100 side and the relay main body 200
Since the external terminal 60 and the lead terminal 6 are connected by the lead wire 22, the difference in thermal expansion between the printed wiring board M and the terminal block 100 side causes the external terminal to Even if thermal stress occurs in the lead wire 60, the lead wire 2
Since the contact point operation on the side of the relay main body 200 can be maintained appropriately. Furthermore, the relay main body 200 has a resin molded part 300.
Since the relay main body 200 is coated with heat resistance, the relay main body 200 can be protected. In other words, cracks may occur in the relay main body 200 or deformation of the terminal paste 2.
There is no fear that the contact pressure of the contact mechanism C set on the terminal base 2 will fluctuate or that the operating characteristics and return characteristics of the relay will fluctuate. Furthermore, if the relay main body 200 is simply covered with a cover etc., there will be concerns about vibrations and shocks, but as mentioned above, the resin molded part 3
If the relay main body 200 is covered with 00, vibration resistance can also be improved. Furthermore, the terminal block 100 and the relay main body 20
0 as a separate body, it is possible to easily accommodate changes in the shape of the external terminal 60, etc., and the shape of the lead terminal 6 on the side of the relay main body 200 is also simplified, making it easier to manufacture as a whole. Note that if the relay main body 200 is coated with silicone rubber or the like prior to molding the resin mold part 300,
Furthermore, effects such as thermal stress absorption are improved. Further, between the external terminal 6o of the terminal block 100 and the lead terminal 6 on the side of the relay main body 200, the lead wire 2
For example, the outer end of the lead terminal 6 of the relay main body 200 may be formed into a flexible shape such as a substantially U-shape to form the terminal block 100.
A similar effect can be obtained by connecting to the external terminal 60 on the side. Furthermore, although the above embodiment describes a polarized relay, similar effects can be obtained when applied to a switch or the like.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an example of a polarized relay to which the surface-mounted electric switchgear according to the present invention is applied, FIG. 2 is a plan view showing the internal configuration of the same polarized relay, and FIG. 3 is the same. FIG. 4 is an exploded perspective view showing the main body of the polarized relay, and FIG. 4 is a side sectional view showing the attached state of the polarized relay. 6 (61-64)...Lead terminal, 22 (221
~224)...Lead wire, 23...Brazing part, 60
(60i to 604)...External terminal, 60a...Curved portion, 100...Terminal block, 200...Device body, 300...Resin mold part, C...Contact mechanism,
M...Wiring board.

Claims (1)

[Claims] (1) A terminal block having a plurality of external terminals whose tips are curved inward and directly brazed to the surface of a wiring board, and a device with a built-in opening/closing contact mechanism set on the inner surface of the terminal block. and a main body, each external terminal of the terminal block and each corresponding lead terminal on the device main body side are electrically connected in a loose state by a lead body that is the same as the external terminal or lead terminal or is separate from the external terminal or lead terminal. . A surface-mounted electrical switching device, characterized in that the device main body is covered with a resin molded portion formed on a terminal block, leaving the external terminals intact.