JP6112402B2 - Switch with indicator light using LED and circuit block mounted with electronic components suitable for it - Google Patents

Description

  The present invention relates to a switch with an indicator lamp using an LED and a circuit block on which an electronic component suitable for the switch is mounted.

  Conventionally, a switch with an indicator lamp (pilot lamp) for displaying an operating state of a load, for example, whether the lighting device is turned on or off has been put into practical use (hereinafter simply referred to as “ Switch ”). This switch is connected in series to the commercial power source 2 and the load (illumination device) 3, and when the load is turned off, the neon tube is turned on, and the user can be notified of the position of the switch.

  FIG. 6 shows a configuration of a basic indicator lamp lighting circuit 100 of a conventional switch with an indicator lamp using a neon tube. The neon tube 101 is connected in series with a resistance element 102 for current limitation, and in parallel with a resistance element 103 for preventing erroneous lighting. When the switch 104 is connected to the terminal T2 side, the load 3 is in the on state, no current flows through the neon tube 101, and the neon tube 101 is not lit. On the other hand, when the switch 104 is connected to the terminal T3 side, the load 3 is practically in an off state, a weak current flows through the neon tube 101 via the resistance element 102, and the neon tube 101 is lit.

  FIG. 7 shows a configuration of a circuit block 110 for the indicator lamp lighting circuit 100. The circuit block 110 is a resin molded product in which a plurality of terminal pieces are inserted. A metal plate that has been punched into a predetermined shape and is bent is inserted into a mold, and a substrate portion is molded with a resin. An electronic component such as a resistance element or a capacitor is mounted on the component mounting portion of one piece, and then the holding portion (unnecessary portion) of the terminal piece of the metal plate is cut and completed. A terminal of a neon tube (not shown) is connected to the U-shaped caulking fixing pieces 111 and 112 and is fixed by caulking. One caulking fixing piece 111 is formed integrally with the lead frame 113, and the other caulking fixing piece 112 is formed integrally with the terminal 116. Further, the lead frame 114 and the terminal 115 are integrally formed. The current limiting resistance element 102 is mounted between the lead frame 113 and the lead frame 114, and the erroneous lighting preventing resistance element 103 is integrated with a terminal 115 and a lead frame (not shown) and a terminal 116. It is mounted between integrated lead frames (not shown). The terminal 115 corresponds to the input terminal T1 in FIG. 6, and the terminal 116 corresponds to the terminal T3.

  By the way, when lightning occurs, a lightning surge is superimposed on the commercial power source 2. The neon tube 101 itself is strong against surge current and will not be damaged even if a large current flows for a moment. On the other hand, when a surge current flows through the current limiting resistance element 102, the resistance element 102 is burned out. Therefore, in the circuit block 110, the lead frames 113 and 114 on which the current limiting resistance element 102 is mounted are exposed to the outside, and when a lightning surge occurs, the lead frames 113 and 114 are discharged. By causing the discharge current to flow directly to the neon tube, the current limiting resistance element 102 is prevented from burning. That is, it is easy to cause discharge intentionally, and the surge current is bypassed from the resistance element 102.

  In recent years, it has been proposed to replace neon tubes with LEDs in order to reduce power consumption even in switches with indicator lights (see Patent Document 1). However, unlike a neon tube, an LED is weak against a momentary large current and has a property of being weak against static electricity as well as lightning surge. For example, static electricity may enter between the LED and the current limiting resistor element from a metal frame used when the switch is attached to the wall surface, and a large current may flow through the LED, causing the LED to burn out. Therefore, contrary to the circuit block 110 for neon tubes, it is required to make it difficult for discharge to occur. In addition, in the indicator lamp lighting circuit described in Patent Document 1, no countermeasure against surge current is particularly taken.

  As one technique for making it difficult for discharge to occur, it is conceivable to increase the distance between lead frames on which electronic components are mounted. However, when the distance between the lead frames is increased, the solder margin for mounting the electronic components is reduced, in other words, the gap between the lead frames is increased, and the electronic components are mounted on the lead frame by an automatic machine. When doing so, positioning accuracy is required. In addition, if vibration or impact is applied to the circuit block after the electronic component is mounted on the lead frame and before the electronic component is fixed by melting the solder, the electronic component falls from the gap between the lead frames. There is a risk of it.

JP 2006-12632 A

    An object of the present invention is to provide a switch with an indicator lamp using an LED and a circuit block on which an electronic component suitable for the switch is mounted.

In order to achieve the above object, a switch with an indicator lamp according to the present invention includes a switch mechanism that switches a contact portion, and a lighting state that is electrically connected to the contact portion and is switched according to the switching state of the contact portion. A lighting display section for switching the non-lighting state,
The lighting display unit further includes an LED as a light emitting element and a circuit block on which an electronic component is mounted,
The circuit block is a resin molded product in which a plurality of terminal pieces are inserted, and is a part of the plurality of terminal pieces protruding from the board part and the board part molded from an insulating resin at a predetermined distance. With two component mounting parts facing each other,
Both ends of the electronic component are mounted on the two component mounting portions,
The board portion is a gap portion between the two component mounting portions, and from the end opposite to the mounting surface of the electronic component on the side different from the side from which the two component mounting portions protrude, It has the protruding piece which protruded so as to oppose the bottom face of components.

  It is preferable that the two component mounting portions and the protruding piece protrude from a side wall of an opening formed in the substrate portion.

  The electronic component is preferably at least two resistance elements connected to both terminals across the LED and a bypass element connected in parallel to the LED in order to limit the current flowing through the LED. .

  The bypass element is preferably a capacitor.

  Alternatively, the bypass element is preferably a resistance element.

In addition, the circuit block on which the electronic component according to the present invention is mounted is a resin molded product in which a plurality of terminal pieces are inserted, and a plurality of terminals protruding from the substrate portion and a substrate portion formed of an insulating resin. Two parts mounting parts that are part of the piece and are opposed to each other with a predetermined distance therebetween,
Both ends of the electronic component are mounted on the two component mounting portions,
The board portion is a gap portion between the two component mounting portions, and from the end opposite to the mounting surface of the electronic component on the side different from the side from which the two component mounting portions protrude, It has the protruding piece which protruded so as to oppose the bottom face of components.

  It is preferable that the two component mounting portions and the protruding piece protrude from a side wall of an opening formed in the substrate portion.

  According to the present invention, a pair of protruding pieces protruding so as to face the bottom surface of the electronic component are provided between the two component mounting portions on which the electronic component is mounted. When the electronic component is mounted on the block or when the electronic component is mounted on the component mounting portion and then transported, the electronic component can be prevented from dropping from the gap between the component mounting portions.

The disassembled perspective view which shows the structure of the switch with an indicator lamp which concerns on one Embodiment of this invention. The circuit diagram which shows the example of 1 structure of the indicator lamp lighting circuit in the said embodiment. The circuit diagram which shows the other structural example of the indicator lamp lighting circuit in the said embodiment. The perspective view which shows the structure seen from the bottom face of the circuit block in the said embodiment. The perspective view which shows the state which mounted the electronic component in the circuit block in the said embodiment. The circuit diagram which shows the structure of the indicator lamp lighting circuit of the conventional switch with an indicator lamp using a neon tube. The perspective view which shows the structure of the circuit block for the conventional indicator lamp lighting circuit.

  A circuit block on which a switch with an indicator lamp and an electronic component suitable for the switch according to an embodiment of the present invention are mounted will be described. FIG. 1 shows a configuration of a switch 1 with an indicator lamp according to the present embodiment. As shown in FIG. 1, the switch with indicator lamp 1 has a housing composed of a body 11 and a cover 12 made of an insulating thermosetting resin. The body 11 is substantially rectangular in plan view, and a substantially rectangular parallelepiped storage space 11a is provided at the center thereof. Moreover, the electric wire insertion hole 11b in which an electric wire is inserted is formed in the both outer sides of the storage space 11a in a longitudinal direction (X direction). Two electric wire insertion holes 11b are formed in each of the width direction (Y direction), and are formed in four places in total. Inside the body 11, a lock spring 13 is provided in the vicinity of each electric wire insertion hole 11b to press the inserted electric wire against a terminal plate described later. Further, inside the body 11, on the outside of the lock spring 13 in the longitudinal direction (X direction), an unlock button for releasing the lock by the lock spring 13 when the electric wire inserted into the electric wire insertion hole 11b is pulled out. 14 is provided. After the lock spring 13 and the unlock button 14 are stored in the body 11, for example, three terminal plates 15, 16, and 17 are mounted from above in the height direction (Z direction). The terminal plates 15 and 16 are provided with fixed contacts 20 and 21 constituting a main switching contact portion together with a movable contact 22 described later. A circuit block 10 on which LEDs and the like are further mounted is mounted above the terminal board 15. A holding frame 30 is attached to the bottom of the storage space 11a of the body 11, and further, a movable plate 18 provided with a movable contact 21 on the upper surface 30a, a reversing handle 19 for driving the movable plate 18, and a reversing handle 19 A coil spring 31 or the like that urges in a predetermined direction is mounted.

  The reversing handle 19 can be swung within a predetermined angle range within a plane defined by the longitudinal direction (X direction) and the height direction (Z direction) around an axis parallel to the width direction (Y direction). is there. The movable plate 18 is electrically connected to, for example, a terminal plate 35 provided on the upper surface 30 a of the holding frame 30, and a part of the movable plate 18 is engaged with the reversing handle 19. Then, the movable contact 22 and the fixed contact 20 come into contact with each other in accordance with the two postures that the reversing handle 19 can stably take, and the load is turned on. Is brought into contact with another fixed contact 21, and the load is switched off. When the reversing handle 19 is mounted on the upper surface 30a of the holding frame 30, the cover 12 is mounted on the body 11 from above in the height direction (Z direction), and the coil spring 32 and the slide cam are further mounted on the upper surface 12a of the cover 12. 33, the push button handle 34, etc. are attached, and the switch with indicator light 1 is completed. In addition, the height direction (Z direction) here is a height direction in the assembly process of the switch with indicator light 1, and after the switch with indicator light 1 is installed on the construction surface, it is in the X direction and the Z direction. The defined surface is horizontal and the Y direction is vertical.

  FIG. 2 shows a configuration example of the indicator lamp lighting circuit 60 mounted on the circuit block 10 in the switch with indicator lamp 1 of, for example, a two-wire type / three-way wiring type. It is assumed that the indicator lamp lighting circuit 60 of each switch with indicator lamp 1 has the same configuration. The two LEDs 61 and 62 are connected in reverse parallel, and one of the LEDs 61 or 62 is lit regardless of the phase of the commercial power supply 2. Resistive elements 63 and 64 are connected to the terminals of the LEDs 61 and 62 connected in reverse parallel to limit the current flowing through the LEDs 61 and 62, respectively. Further, a resistance element 65 is connected in parallel as a bypass element between both terminals of the LEDs 61 and 62 connected in reverse parallel. In the state shown in FIG. 2, the load 3 is in the on state, and the LED 61 or 62 is not lit. It is assumed that the push button handle 34 is operated, the reversing handle 19 is reversed, and the movable plate 18 is rotated, whereby the movable contact 22 is separated from the fixed contact 20 and comes into contact with another fixed contact 21 (shown by a broken line in the figure). State). A weak current flows from the commercial power source 2 to the LED 61 or 62 via the resistance elements 63 and 64, and the LED 61 or 62 is lit. At this time, since the impedance of the indicator lamp lighting circuit 60 is high and the current flowing through the LED 61 or 62 and the load 3 is very small, the load 3 is practically in an off state (non-lighting in the case of a lighting device). Even if a high voltage is applied to the indicator lamp lighting circuit 60 due to lightning surge or static electricity in that state, the voltage is divided not only by the LED 61 or 62 but also by the resistance elements 63 to 65 connected in series. . As a result, the current flowing through the LED 61 or 62 is reduced, and burning of the LED 61 or 62 can be prevented.

  FIG. 3 shows another configuration example of the indicator lamp lighting circuit 60. Compared with the configuration example shown in FIG. 2, a difference is that a capacitor 66 is connected in parallel as a bypass element between both terminals of the LEDs 61 and 62 connected in reverse parallel. When high frequency noise is superimposed on the commercial power supply, the high frequency noise flows through the bypass capacitor 66 and does not flow into the LED 61 or 62, thus preventing the LED 61 or 62 from being erroneously lit when the load 3 is on. can do.

  FIG. 4 shows a configuration in which the circuit block 10 is viewed from the surface opposite to the mounting surface of the electronic component. As described above, the circuit block 10 is a resin molded product in which a plurality of terminal pieces are inserted, and after a metal plate punched into a predetermined shape and bent is inserted into a mold and a substrate portion is molded with resin Then, an electronic component such as a resistance element or a capacitor is mounted on the lead frame, and then the holding portion (unnecessary portion) of the terminal piece of the metal plate is cut and completed. FIG. 4 shows a state before the holding part (unnecessary part) of the terminal piece of the metal plate is cut after mounting electronic components such as a resistance element and a capacitor on the lead frame.

  The circuit block 10 includes a substrate portion 70 formed of an insulating resin having heat resistance, a plurality of rectangular openings 71 formed in the substrate 70, and a plurality of terminal pieces protruding from the side walls of the openings 71. Two lead frames (component mounting portions) 81a and 81b, which are a part and face each other at a predetermined distance, are provided. Both ends of the electronic component 91 are mounted on the two lead frames 81a and 81b. The opening 71 on which the electronic component is mounted penetrates the board portion 70 from the mounting surface side of the electronic component to the back side thereof. In each opening 71, the portion protruding in an arc shape is a part of the metal plate 90, and indicates the tip portion of the lead frames 81 a and 81 b on which the electronic component 91 is mounted (soldered). In addition, it is assumed that the bottom surface of the electronic component 91 mounted on the terminal piece is visible from each opening 71. Of the side wall of each opening 71, the lead frame 81a, 81b protrudes from the end opposite to the mounting surface of the electronic component 91 on the side opposite to the side from which the lead frames 81a, 81b protrude to face the bottom surface of the electronic component 91. Thus, a pair of protruding pieces 71b are formed.

  FIG. 5 shows a state where the electronic component 91 is mounted on the lead frames 81 a and 81 b exposed from the opening 71. In the present embodiment, when lightning surge or the like is superimposed on the commercial power supply 2, the distance between the lead frames is made longer than that of the conventional circuit block in order to prevent the discharge between the lead frames 81a and 81b. For this reason, the solder margin for mounting the electronic component 91 is narrow, in other words, the gap 71a between the lead frames 81a and 81b is large, and the electronic component 91 is mounted on the lead frames 81a and 81b by an automatic machine. In addition, positioning accuracy is required. Further, if vibration or impact is applied to the circuit block 10 after the electronic component 91 is mounted on the lead frames 81a and 81b and before the electronic component is fixed by melting the solder, the electronic component 91 is moved to the lead frame. There is a risk of falling from the gap 71a between 81a and 81b. Therefore, in the present embodiment, in the electronic component mounting opening 71 formed in the substrate portion 70 of the circuit block 10, the electronic on a side different from the side from which the lead frames 81a and 81b on which the electronic component is mounted protrudes. A protruding piece 71b made of an insulating resin is formed so as to protrude from the end opposite to the component mounting surface so as to face the bottom surface of the electronic component 91, respectively. Thus, by forming the protruding piece 71b, when the electronic component 91 is mounted on the circuit block 10 by an automatic machine, or when the electronic component 91 is transported after being mounted on the lead frames 81a and 81b, the electronic component 91 It is possible to prevent 91 from falling from the gap 71a between the lead frames 81a and 81b.

  In addition, this invention is not limited to description of the said embodiment, A various deformation | transformation is possible. For example, in the above description, in order to limit the current flowing through the LED 61 or 62, one resistive element 63 and 64 is connected to both terminals across the anti-parallel circuit of the LEDs 61 and 62, respectively. 63 or 64 may be constituted by a series circuit or a series-parallel circuit of a plurality of resistance elements. In addition, although the resistor element 65 or the capacitor 66 is connected in parallel to the anti-parallel circuit of the LEDs 61 and 62 as a bypass element, a parallel circuit of the resistor element 65 and the capacitor may be connected in parallel.

  Further, the position, number and shape of the protruding pieces 71b formed on the board part 70 of the circuit block 10 are not particularly limited as long as they can guide the bottom surface of the electronic component 91 and prevent the electronic component 91 from falling. Good. In the above-described embodiment, the pair of protruding pieces 71b protrude from the side wall of the opening 71 of the substrate unit 70 so as to face each other. However, the protruding piece 71b has the side walls of the opening 71 opposite to each other. You may form in the shape of a beam so that it may connect. Alternatively, the protruding piece 71b may be formed so as to protrude only from one side wall of the opening 71 or the recess formed in the substrate part 70. Moreover, the use of the circuit block 10 is not limited to a switch with an indicator lamp using an LED, and can be used for an electric device on which other electronic components are mounted.

DESCRIPTION OF SYMBOLS 1 Switch with indicator light 2 Commercial power supply 3 Load 10 Circuit block 15, 16, 17 Terminal board (switch mechanism)
18 Movable plate (switch mechanism)
19 Reverse handle (switch mechanism)
20, 21 Fixed contact (contact part)
22 Movable contact (contact part)
60 lighting display circuit (lighting display part)
61, 62 LED
63, 64 Resistive element for limiting current flowing to LED 65 Resistive element as bypass element 66 Capacitor as bypass element 70 Substrate part 71 Opening 71a Lead frame gap 71b Protruding piece 81a, 81b Lead frame (component mounting part) )
90 Metal plate 91 Electronic parts

Claims (7)

A switch with an indicator lamp comprising a switch mechanism for switching a contact portion and a lighting display portion that is electrically connected to the contact portion and switches between a lighting state and a non-lighting state according to the switching state of the contact portion. And
The lighting display unit further includes an LED as a light emitting element and a circuit block on which an electronic component is mounted,
The circuit block is a resin molded product in which a plurality of terminal pieces are inserted, and is a part of the plurality of terminal pieces protruding from the board part and the board part molded from an insulating resin at a predetermined distance. With two component mounting parts facing each other,
Both ends of the electronic component are mounted on the two component mounting portions,
The board portion is a gap portion between the two component mounting portions, and from the end opposite to the mounting surface of the electronic component on the side different from the side from which the two component mounting portions protrude, A switch with an indicator lamp, characterized by having a protruding piece protruding so as to face the bottom surface of a component.   2. The switch with an indicator lamp according to claim 1, wherein the two component mounting portions and the protruding piece protrude from a side wall of an opening formed in the substrate portion.   The electronic component includes at least two resistance elements connected to both terminals across the LED and a bypass element connected in parallel to the LED in order to limit a current flowing through the LED. The switch with an indicator light according to claim 1 or 2.   The switch with an indicator light according to claim 3, wherein the bypass element is a capacitor.   The switch with an indicator light according to claim 3, wherein the bypass element is a resistance element. It is a resin molded product in which a plurality of terminal pieces are inserted, and is a part of the plurality of terminal pieces protruding from the board part and a board part molded from an insulating resin, with a predetermined distance therebetween. A circuit block having two component mounting parts and mounted with electronic components ,
Both ends of the electronic component are mounted on the two component mounting portions,
The board portion is a gap portion between the two component mounting portions, and from the end opposite to the mounting surface of the electronic component on the side different from the side from which the two component mounting portions protrude, A circuit block comprising a protruding piece protruding so as to face the bottom surface of a component.   The circuit block according to claim 6, wherein the two component mounting portions and the protruding piece protrude from a side wall of an opening formed in the substrate portion.

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