KR20090082860A - Switch with display - Google Patents

Abstract

A switch of a display unit is provided to position a lighting block at a certain location and to be firmly assembled by a protrusion and a concave portion. A switch of a display unit is comprised of a switch unit, a terminal, a display unit, a lighting block(8) and a main body. The switch unit switches a contact point inserted into a power feed path formed from a power source to a load. The terminal connects the contact point of the switch unit to a power feeding wire. The display unit is electrically connected to the terminal and turned off when the contact point is closed. The lighting block has a power feed path and a printed circuit board(81). The main body is composed of a box-like body made of synthetic resin and a cover. The switch unit, the terminal and the lighting block are accommodated inside the main body.

Description

Display switch {SWITCH WITH DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display unit switch having an indicator light that turns on and off power supply from a power supply to a load and lights up during power supply from a power supply to a load.

Conventionally, the display part switch 200 as shown in FIG. 8 is provided (for example, refer patent document 1).

This display unit switch 200 is a so-called three-way push button switch in which the contact configuration is a single-pole switching, and includes a first fixed contact 210, a second fixed contact (not shown), and each fixed contact. A load (not shown) from a power supply (not shown) having a movable contact (not shown) for contacting and disconnecting the contact point, and selectively contacting and disconnecting the movable contact with the first fixed contact 110 and the second fixed contact. Switch mechanism (not shown) for turning on or off power supply to the power supply, a first terminal plate 220 electrically connected to the movable contact, and a second terminal plate 230 electrically connected to the first fixed contact 210. And a third terminal plate 240 electrically connected to the second fixed contact.

In addition, the display switch 200 is provided at both ends of a current transformer (not shown) with a primary winding 251 interposed between the movable contact and the first terminal plate 220, and a secondary winding (not shown) of the current transformer. Connected between the transformer block 250 having a pair of coil connections 252 and 252 electrically connected to each other, and the pair of coil connections 252 and 252, and the power supply from the power supply to the load is supplied (on). A light emitting diode 261 that emits light at the time, and a neon lamp 262 that is connected between the second terminal plate 230 and the third terminal plate 240 and emits light when the power supply from the power supply to the load is cut off (off). The dimming block 260 is provided. In addition, the display part switch 200 is the switch mechanism part mentioned above in the base body which combines the main body 270 which consists of box-shaped synthetic resin molded articles, and a cover (not shown) in the front-back direction, and 1st-1st The three terminal plates 220 to 240, the transformer block 250, and the dimming block 260 are accommodated.

Here, the dimming block 260 is a light emitting diode 261 and neon on the printed circuit board 263 in which the conductive pattern 263a for the light emitting diode 261 and the conductive pattern 263b for the neon lamp 262 are formed. It is comprised by attaching the electronic component containing the lamp 262. As shown in FIG. In addition, the dimming block 260 includes a pair of through holes 263c and 263c and a neon lamp 262 for soldering the pair of coil connections 252 and 252 of the transformer block 250 to the conductive pattern 263a. A first connection terminal 264 for connecting to the second terminal plate 230 and a second connection terminal 265 for connecting the neon lamp 262 to the third terminal plate 240 are provided.

The dimming block 260 contacts and connects each of the connection terminals 264 and 265 to the respective terminal plates 230 and 240, respectively, and transmits the transformer through the pair of through holes 263c and 263c of the printed circuit board 263. The pair of coil connecting portions 252 and 252 of the block 250 are housed in the cover in a state in which the pair of coil connections 252 and 252 are soldered to the conductive pattern 263a for the light emitting diode 261.

Patent Document 1: Japanese Patent Laid-Open No. 2001-184991 (see Figs. 2 and 3)

By the way, in the said prior art example, the cover is formed in the box shape which opens back, and the accommodation recessed part (not shown) for accommodating the light control block 260 is provided in the inside of the said cover 2, and such a storage recessed The dimming block 260 was stuck to the cover by inserting the part from the rear side. In addition, in order to insert the light control block 260 into the storage recess from the rear side, a clearance (clearance) is required between the inner wall of the storage recess and the printed board 263 of the light control block 260. However, by providing the clearance as described above, positioning of the dimming block 260 in the storage recess is difficult, so that the front surface of the cover is irradiated forward with the light emitted from the dimming block 260. There exists a possibility that the positional relationship with the provided window hole may shift | deviate.

This invention is made | formed in view of the said situation, and the objective is to provide the display part switch which can reliably position a dimming block with respect to a cover.

The invention according to claim 1, in order to achieve the above object, a switch mechanism portion for opening and closing a contact inserted in a power supply path from a power supply to a load, a terminal portion for connecting the switch mechanism portion to a wire for power supply, and an electrical connection with the terminal portion. A dimming block having an indicator light that lights up when the contact of the switch mechanism part is supplied to the load from the power supply, and a feeding path from the terminal part to the indicator light, and a printed wiring board on which the indicator light is mounted; A push button provided by combining a main body and a cover made of a synthetic resin molded product in the front-rear direction, having a switch mechanism part, a terminal part, and a base housing the dimming block therein, and the switch mechanism part being movable in the front-rear direction with respect to the front surface of the cover. Handle, and the corresponding push button handle is pressed The opening is opened and closed each time, and the cover is provided with a storage recess for accommodating the light control block, a window hole provided in the front of the cover to irradiate light emitted from the light of the light control block forward, and one projecting from the inner wall of the cover toward the storage recess. The projection wiring board of the dimming block is provided with one or more projections, and one or more fitting recesses which fit with the projections from the front-back direction of the cover are provided.

According to the invention of claim 1, one or a plurality of projections protruding from the inner wall of the cover toward the storage concave portion are provided, and at least one fitting concave portion is fitted to the projection from the front and rear direction of the cover. Since it is provided in the printed wiring board, when a dimming block is accommodated in the accommodating recess of a cover, a dimming block can be reliably positioned with respect to a cover by fitting a projection part and a fitting recess. In addition, since the protrusion and the fitting recess fit in the direction in which the dimming block is stored (the front and rear directions of the cover) with respect to the storage recess, the assembling property of the dimming block with respect to the cover is not deteriorated.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, a protrusion over the edge of the fitting recess is provided in the protrusion in the process of fitting the protrusion and the fitting recess.

According to the invention of claim 2, since the projections provided on the projections cross the edges of the fitting recesses, the edges of the projections and the fitting recesses are engaged, so that the dimming block can be prevented from falling off from the storage recess of the cover. In addition, the assembling worker can easily recognize that the dimming block is normally stuck to the cover by the protrusion over the edge of the fitting recess.

According to the present invention, the dimming block can be reliably positioned with respect to the cover by fitting the protrusion and the fitting recess.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which applied the technical idea of this invention to the cut off type push button switch which has a contact structure of a single pole single throw (SPST) is shown in FIGS. It demonstrates in detail with reference to FIG. However, since this kind of push button switch is conventionally known as described in Patent Literature 1, the illustration and description of the detailed configuration are appropriately omitted. In addition, in the following description, the up-down direction in FIG. 2 is set to the front-back direction, similarly the left-right direction in FIG. 2 is set to the left-right direction.

As shown in FIG. 2 and FIG. 3, the main body 2 which consists of a rectangular box-shaped synthetic resin molded article which opened the front surface, and the cover 3 which consists of a rectangular box-shaped synthetic resin molded article which opened the back side are front-back direction By combining with each other, the base 1 is assembled. In addition, the external dimension of the base body 1 is 1 / of the longitudinal direction of the opening window of the attachment frame (not shown. JIS C8375) of the diagonal lead wire wiring mechanism standardized by the Japanese Industrial Standard. It is formed in the dimension which occupies 3 (in other words, the dimension which can be attached to an attachment frame so that three rows can be arranged in the longitudinal direction of an opening window). In order to be detachably attachable to the opening window of the attachment frame, the cover 3 is provided with a pair of locking claws 31 and 31 on both end faces, respectively. In the cover 3, a space 32 is formed in the distribution (left side in FIG. 2) of the locking claws 31 and 31 on one side (right side in FIG. 2), and the locking claw 31 ) Is elastically curved in the inward direction of the cover 3. Accordingly, the base 1 can be detachably attached to the attachment frame by engaging the engagement claws 31 and 31 in the engagement holes (not shown) provided in the attachment frame, thereby enabling other buried wiring mechanisms. Similarly, it can be buried in contrast surfaces such as walls. Coupling of the main body 2 and the cover 3 is the direction of the longitudinal direction of the main body 2 to the engaging holes 33a of the four engaging pieces 33 hanging from the four corners on the rear end side of the cover 3. This is executed by each of the four locking projections 21 formed on both sides along the side (see FIG. 3). At the time of stopping, it is possible to simply stop using the elasticity of the stopping piece 33 and the inclined surface 21a of the upper end of the stopping protrusion 21.

In the body 1, a switch mechanism portion 4 for opening and closing a contact (fixed contact 40 and movable contact 41a) inserted into a power supply path from a power supply to a load (for example, a lighting fixture), and a switch mechanism portion 4 Is connected electrically to the three terminal portions 5, 6 and 7 and the two terminal portions 6 and 7 that connect the contact of the contact to the electric wire for power supply. Dimming with a light indicator 80 that lights up when the power is supplied, and a printed wiring board 81 on which a feed path from the terminal portions 6, 7 to the indicator 80 is formed and at which the indicator 80 is mounted. Block 8 is received.

The interior of the main body 2 is divided into three housing sections (power supply side terminal accommodating portion 23A, load side terminal accommodating portion 23B, and central accommodating portion 23C) arranged in the left and right direction by a plurality of partitions 22. It is. The power supply side terminal accommodating portion 23A located at the right end houses the power supply terminal portion 5 to which a wire connected to one pole (non-grounding pole) of the power supply (commercial AC power supply) is stored, and the load side terminal located at the left end. A first load side terminal portion 6 to which a wire connected to a terminal on the side not connected to the power supply of the load is connected to the housing portion 23B, and a second to which the wire connected to a terminal on the side connected to the power supply of the load is connected. The load side terminal portion 7 is housed together. These three terminal parts 5 to 7 each have a terminal plate 50, 60, 70 having a different shape, two or one locking springs 51, 61, 71, and a release button 52, 62. It consists of missing terminals [fasteners]. However, the four lock springs 51, 61, and 71 in total and the two release buttons 52 and 62 in total are the same. The first load side terminal portion 6 and the second load side terminal portion 7 share one release button 62. In addition, about this kind of fastening terminal, since it is conventionally well-known as described in patent document 1, detailed description is abbreviate | omitted.

As shown in FIG. 6, the bottom part of the main body 2 has two electric wire insertion holes 24 which penetrated the power supply terminal accommodating part 23A, and the load side terminal accommodating part 23B, respectively, and the release button 52, A release hole (not shown) for inserting a tool (for example, a negative driver) for pressing and driving 62 is provided. That is, when the stripped wire is inserted into the base 1 through the wire insertion hole 24, the conductors (not shown) of the wire are connected to the terminal plates 50, 60, 70 and the locking springs 51, 61, 71. It is sandwiched between, and the electric wire (conductor) and the terminal boards 50, 60, 70 are electrically and mechanically connected. In addition, when the release buttons 52 and 62 are pressurized at the tip of the tool inserted into the release hole, the locking springs 51, 61 and 71 are bent through the release buttons 52 and 62, thereby providing an electric wire (conductor) and The mechanical connection state of the terminal plates 50, 60, 70 can be canceled and the electric wire can be pulled out from the electric wire insertion hole 24. As shown in FIG.

A substantially L-shaped support piece 50a is integrally provided on the terminal plate 50 of the power supply-side terminal part 5, and the front end portion of the support piece 50a is formed along the inner bottom surface of the main body 2. It extends to 23C) and is provided (refer FIG. 6). In addition, the terminal plate 60 of the first load-side terminal portion 6 is integrally formed with an extension piece 60a having a fixed contact 40 fixed to a tip portion thereof, and extends the extension piece 60a so that the center piece 60a extends. The fixed contact 40 is located in 23 C of storage parts. In addition, the terminal plate 60 of the first load side terminal portion 6 and the terminal plate 70 of the second load side terminal portion 7 are housed in the lower terminal accommodating portion 23B in an electrically isolated state from each other.

The switch mechanism 4 includes a fixed contact 40, a movable contact 41a, a switch 41, a coil spring (not shown), a reverse handle 42, a push button handle 43, and a slide cam (not shown). And return spring 44. The opening and closing body 41 made of a metal plate is accommodated in the central housing portion 23C of the main body 2 so that the rear end thereof is brought into contact with the front surface of the support piece 50a of the terminal plate 50. A V-shaped recess 25 into which both ends of the opening and closing body 41 are fitted is provided on the inner wall facing the shorter direction in the center housing portion 23C of the main body 2 (see FIG. 6). Therefore, the opening-closing body 41 is accommodated so that rotational movement to the left-right direction in the center accommodating part 23C may be made into the site | part which contacted the rear end part of the V-shaped recessed part 25 as a point. Here, the movable contact 41a is fixed to the surface facing the terminal plate 60 of the opening and closing body 41, and the movable contact 41a and the fixed contact (when the opening and closing body 41 is rotated and fell to the left side). When the contact 40 closes, the contact is closed, and when the switch 41 rotates in the opposite direction and falls to the right, the movable contact 41a and the fixed contact 40 are separated to open the contact. Since the rear end of the opening and closing body 41 is in contact with the support piece 50a of the terminal plate 50, the power supply side terminal portion 5 and the first load side terminal portion 6 are connected to the switch mechanism portion 4 when the contact is closed. It conducts via the fixed contact 40, the movable contact 41a, and the switch 41.

The inversion handle 42 is inserted into the recessed part 34 from the rear through the hole 34a opened in the bottom surface of the recessed part 34 provided in the front surface of the cover 3, and provided in both sides of the cylinder part 42a. The inverted triangular shaft 42b is pivotally supported on a bearing 35 (see FIG. 5) formed on the inner wall of the cover 3 to be rotatably attached. Engaging protrusions 42c and 42c engaging with the slide cam are projected on both upper ends of the reversing handle 42, respectively. The coil spring is stored in a compressed state in the cylindrical portion 42a of the reversing handle 42 in a state where the rear end is engaged with the spring seat 41b provided to protrude from the leading edge of the opening and closing body 41. Accordingly, the coil spring is bent in the left and right direction by the rotational movement of the inversion handle 42, and the opening and closing body 41 is inverted and driven in the direction in which the coil spring is bent.

The push button handle 43 stops the locking projections 43a and 43a in the front and rear locking grooves 34b and 34b formed on both inner wall surfaces of the recessed portion 34 of the cover 3, respectively. It is housed in the recess 34 so as to be movable. The return spring 44 is attached to the rear face of the push button handle 43 and has two return spring pieces 44a and 44a which are enlarged and opened rearward. And the push-button handle 43 is always elastically pressed forward by the front-end | tip of return spring piece 44a, 44a elastically contacting the bottom surface of the recessed part 34. As shown in FIG. The slide cam is slidably mounted in the left and right directions on the rear surface of the push button handle 43, and each time the push button handle 43 is pressed, the slide cam alternately slides in the right direction and the left direction. In addition, a pair of engagement cam bodies (not shown) protrude from the slide cam so as to correspond to the engagement protrusions 42c of the inversion handle 42. Thus, when the push button handle 43 is pushed and moved backwards, one engagement cam body of the slide cam touches one engagement protrusion 42c of the inversion handle 42, and the push button handle 43 As the reversal handle 42 is moved backward, the opening and closing body 41 is reversely driven by inverting the direction in which the reversal handle 42 falls.

In addition, although illustration is abbreviate | omitted, the operation handle formed in the dimension larger than the push button handle 43 is detachably attached to the front surface of the base 1 (cover 3). This operation handle is axially supported by the pair of shaft portions 3b protruding forward from the left end on the front surface of the cover 3 so as to be rotatable in the front-rear direction. That is, by pressurizing an operation handle, the pushbutton handle 43 of the switch mechanism part 4 can be pressurized, and the operability of the switch mechanism part 4 improves.

Next, the dimming block 8 will be described. As shown in FIG. 4, the printed wiring board 81 of the dimming block 8 has a pair of arm portions 81a and 81a and a body portion 81b and is formed in an approximately T-shape, and has a body portion 81b. An indicator 80 made of a light emitting diode is mounted on the front surface of the front panel, and an electronic component 82 such as a current limiting resistor is mounted on the front surface of each arm portion 81a. And the light indicator 80 and the electronic component 82 are electrically connected (serial connection) by the conductor pattern 85 formed in the front surface of the printed wiring board 81. As shown in FIG. In the series circuit of the indicator 80 and the electronic component 82 mounted on the printed wiring board 81, the pair of contacts 83 and 83 are elastically contacted with the terminal boards 60 and 70 separately, so that the first load-side terminal portion It is electrically connected between 6 and the 2nd load side terminal part 7. As for the contact 83, the contact piece 83a bent in substantially L shape is provided at the front end side, and the insertion part 83b bent so as to be folded is provided in the rear end side. On the other hand, rectangular insertion holes 81c and 81c pass through both arm portions 81a and 81a of the printed wiring board 81, and the insertion portions 83b are inserted into the respective insertion holes 81c and 81c from the rear. Thereby, the pair of contacts 83 and 83 are attached to the printed wiring board 81, respectively. In addition, the plug portion 83b plugged into the plug hole 81c is soldered to an end portion of the conductor pattern 85 formed on the entire surface of the printed wiring board 81.

The dimming block 8 constructed as mentioned above is accommodated in the accommodating recessed part 36 provided in the cover 3, as shown to FIG. 1 and FIG. The storage concave portion 36 is a protrusion wall (center protrusion wall 36a and side protrusion walls 36b, 36b) protruding rearward from the front wall of the cover 3, and side walls on both the left and right sides facing the longitudinal direction. It consists of the space enclosed by the side wall 3c of the left side. The central protruding wall 36a is formed in substantially U shape from the back. Moreover, the pair of side protrusion walls 36b and 36b are formed in the flat shape which connects the edge part of the center protrusion wall 36a, and each side wall along the longitudinal direction of the cover 3. As shown in FIG. Therefore, the accommodating recessed part 36 is formed in substantially T shape from the back. Moreover, the front wall in the storage recessed part 36 is provided with the window hole 3d for irradiating forward the light emitted by the indicator 80 of the dimming block 8 in the front-back direction, and this window hole ( A translucent cover 3e made of a synthetic resin molded article having translucency is sandwiched in 3d) (see FIG. 3).

The dimming block 8 accommodated in the storage recess 36 is supported by three supporting protrusions 37a, 37b, 37b which protrude forward from the front wall of the cover 3. The support protrusion 37a is formed in substantially U shape from the front, and is arrange | positioned in the space enclosed by the center protrusion wall 36a. Moreover, the pair of support protrusions 37b and 37b are formed in the rectangular shape of the width seen from the front, and are arrange | positioned in the vicinity of the both ends of the side wall 3c. And when storing the light control block 8 in the storage recessed part 36, the front-end | tip part of the trunk part 81b of the printed wiring board 81 is contacted and supported by the support protrusion 37a from the front, and a pair of arm parts ( 81a and 81a are respectively supported in contact with the support protrusions 37b and 37b from the front, and at the same time, the protruding wall (the central protruding wall 36a and the side protruding walls 36b and 36b) and the side wall 3c of the cover 3 are supported. Position is regulated in the horizontal direction.

Here, substantially semi-circular columnar protrusions 38 and 38 are formed inside the pair of supporting protrusions 37b and 37b to protrude into the storage recess 36 from the side wall 3c and the front wall of the cover 3. . On the other hand, the arm parts 81a and 81a of the printed wiring board 81 are formed with the semi-circular fitting recesses 84 and 84 which fit with these pair of projection parts 38 and 38 in the front-back direction. Accordingly, when the dimming block 8 is received from the rear in the storage recess 36 when the dimming block 8 is attached to the cover 3, the pair of projections 38 and 38 and the printed wiring board 81 are paired. The fitting recesses 84 and 84 are to be fitted. In this way, positioning of the printed wiring board 81 is performed in the longitudinal direction of the cover 3 by the side walls on both sides along the longitudinal direction of the cover 3, and the projections 38 and 38 are also positioned. By fitting with the fitting recesses 84 and 84, positioning of the printed wiring board 81 in the direction of the short side of the cover 3 can be performed. In other words, when the projections 38 and 38 and the fitting recesses 84 and 84 are not provided in the same manner as in the conventional example, the printed wiring board 81 and the side walls on both sides along the longitudinal direction of the cover 3 are formed. Although the positioning of the dimming block 8 in the direction of the shorter side of the cover 3 becomes difficult due to the clearance between them, in this embodiment, the protrusion part provided in the cover 3 as mentioned above. (38, 38) and fitting recesses (84, 84) provided on the printed wiring board (81), the dimming block (8) to the cover 3 in the shorter direction of the cover (3) Can be positioned reliably. In addition, since the projections 38 and 38 and the fitting recesses 84 and 84 fit in the direction in which the dimming block 8 is accommodated (the front and rear directions of the cover 3) with respect to the storage recess 36, The assembly of the light control block 8 with respect to the cover 3 does not deteriorate.

In the present embodiment, in the process of fitting the projections 38 and 38 and the fitting recesses 84 and 84, the projections 38a and 38a that ride over the edges of the fitting recesses 84 and 84. ) Is provided in the projections 38 and 38. This projection 38a is formed in the return shape which protrudes from the peripheral surface of the projection part 38 (refer FIG. 1). In this way, the projections 38a and 38a provided in the projections 38 and 38 travel over the edges of the fitting recesses 84 and 84 so that the projections 38a and 38a fit with the projections 84 and 84. Since the edges of the edges engage with each other, it is possible to prevent the dimming block 8 from falling off from the accommodation recess 36 of the cover 3. In addition, the assembling worker can easily recognize that the dimming block 8 is normally stuck to the cover 3 by the projections 38a and 38a passing over the edges of the fitting recesses 84 and 84. There is also an advantage.

In addition, in this embodiment, the support protrusions 37b and 37b which support the arm parts 81a and 81a of the printed wiring board 81 have the rectangular shape of the width seen from the front as shown to Fig.7 (a). Although formed, as shown in FIG.7 (b), it may be formed in the substantially semi-circular columnar shape which is concentric with the projection parts 38 and 38 and whose radius is larger than the projection parts 38 and 38. As shown in FIG.

In the present embodiment configured as described above, the power supply side terminal portion 5 is connected to the voltage side pole of the power supply (commercial AC power supply), and the second load side terminal portion 7 is connected to one end of the load with respect to the ground side pole of the power supply. The first load side terminal portion 6 is connected to the other end of the load. That is, the dimming block 8 is connected in parallel with the load via the first and second load side terminal portions 6 and 7 with respect to the power supply, and when the contact is open, the indicator light 80 turns off and the contact is closed so that the power supply is closed. When the power is supplied to the load from the lamp, the indicator 80 lights to display the operation state of the load.

In addition, in this embodiment, although the truncated type of the monopole single throw was illustrated, it is not limited to this, It is the present invention also in the display switch of a bipolar single throw type | mold type | mold, a single-pole switching 3-way type, or 4-route type. It is clear that the technical idea of this is applicable.

1 is a view showing an embodiment of the present invention, Figures 1 (a) and (b) is a partially omitted perspective view of a state in which the dimming block is stored in the storage recess of the cover,

2 is an exploded perspective view of an embodiment of the present invention;

3 is a perspective view of an embodiment of the present invention;

4 is a plan view of the dimming block in the embodiment of the present invention;

5 is an exploded perspective view of a cover and a dimming block in the embodiment of the present invention;

6 is a plan view without the cover in the embodiment of the present invention;

(A) and (b) is a perspective view which shows the principal part of the cover in embodiment of this invention,

8 is a partially omitted exploded perspective view showing a conventional example.

Explanation of symbols for the main parts of the drawings

2: cover 8: dimming block

36: storing recess 38: protrusion

80 indicator light 81 printed wiring board

84: fitting recess

Claims (2)

In the display switch, The switch mechanism part which opens and closes the contact inserted in the feeding path from a power supply to a load, the terminal part which connects the contact of a switch mechanism part to the electric wire for electric power, and the terminal part are electrically connected, and the contact of a switch mechanism part is closed, The main body and the cover which consist of a light control block having an indicator light which lights up when the electric power is supplied from the power supply to the load, and a feed wiring path from the terminal portion to the indicator light and which the indicator light is mounted on, and a box-shaped synthetic resin molded article It is made by combining in the front and rear direction, and provided with a body for storing the switch mechanism portion, the terminal portion, the dimming block therein, The switch mechanism portion has a push button handle provided to be movable in the front-rear direction with respect to the front face of the cover, and opens and closes the contact whenever the push button handle is pressed. The cover has an accommodating recess for accommodating the dimming block, a window hole provided in the front of the cover for irradiating the light emitted from the light of the dimming block forward, and one or a plurality of protrusions protruding from the inner wall of the cover toward the accommodating recess. , The printed wiring board of the dimming block is provided with one to a plurality of fitting recesses which are fitted with the protrusions from the front-back direction of the cover.  Indicator switch. The method of claim 1, In the process of fitting the protrusion and the fitting recess, a protrusion over the edge of the fitting recess is provided in the protrusion. Indicator switch.

Images