JP2014192152A - Switch with pilot lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply countermeasures against a lightning surge and static electricity to a pilot lamp lighting circuit, in a switch with a pilot lamp using an LED.SOLUTION: A switch with a pilot lamp includes a switch mechanism that performs switching of a contact part, and a lighting display part 60 that is electrically connected to the contact part and that switches between a lit state and an unlit sate depending on a switching state of the contact part. The lighting display part 60 also comprises LEDs 61 and 62 that serve as light-emitting elements, at least two resistance elements 13 and 64 that are connected to both terminals thereof with the LEDs 61 and 62 in between, so as to limit an electric current flowing through the LED, and a bypass element 65 that is connected in parallel with the LEDs 61 and 62.

Description

  The present invention relates to a switch with an indicator lamp for displaying an operating state of a load.

  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 is passed 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 intrude 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.

JP 2006-12632 A

    An object of this invention is to provide the switch with an indicator lamp using LED provided with the indicator lamp lighting circuit which took the countermeasure against a lightning surge and static electricity.

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 is connected in parallel to the LED as a light emitting element, at least two resistance elements connected to both terminals of the LED in order to limit the current flowing through the LED, and the LED. And a bypass element.

  The bypass element is preferably a capacitor.

  Alternatively, the bypass element is preferably a resistance element.

  It is preferable that one or a plurality of resistance elements are further connected in series to two resistance elements connected to both terminals with the LED interposed therebetween.

  Comparing the series circuit of the resistor element and the LED of the conventional example and the series circuit of the resistor element and the LED and the resistor element, the series circuit of the resistor element and the LED and the resistor element according to the present invention is more As a result, the anti-surge voltage characteristic against lightning surge superimposed on the commercial power source is improved. Furthermore, since two or more resistance elements are connected to both terminals across the LED, there is a resistance element between the LED and a location where static electricity may invade, However, it is difficult for a large current to flow through the LED, and the anti-static property is improved.

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 switch with an indicator lamp according to an embodiment of the present invention 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. The movable contact 22 and the fixed contact 20 come into contact with each other in accordance with two postures that the reversing handle 19 can stably take, the load is turned on, the movable contact 21 and the fixed contact 20 are separated, and the movable contact 21 Is brought into contact with another fixed contact 22, 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 board part 70 is formed of an insulating resin having heat resistance, and the opening 71 in which the electronic component is mounted penetrates the board part 70 from the mounting surface side to the back side of the electronic part. 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.

  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.

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 Resistance element for limiting the current flowing through the LED 65 Resistance element as a bypass element 66 Capacitor as a bypass element

Claims (4)

A switch mechanism for switching the contact part;
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 a switching state of the contact portion;
The lighting display part
An LED as a light emitting element;
In order to limit the current flowing in the LED, at least two resistance elements connected to both terminals across the LED;
A switch with an indicator lamp, further comprising a bypass element connected in parallel to the LED.   The switch with an indicator light according to claim 1, wherein the bypass element is a capacitor.   The switch with an indicator light according to claim 1, wherein the bypass element is a resistance element.   The display according to any one of claims 1 to 3, wherein one or a plurality of resistance elements are further connected in series to two resistance elements connected to both terminals of the LED. Switch with light.

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