JP5174567B2 - Indicator light - Google Patents

Description

  The present invention relates to an indicator lamp.

  Conventionally, various indicator lamps and illumination devices using a light guide plate have been provided (see, for example, Patent Document 1).

  FIG. 7 shows an example of a light guide type guide lamp (indicator lamp), a substantially rectangular box-shaped lamp main body 101 having an opening on the front side, and a substantially rectangular plate-shaped display board attached to the opening side of the lamp main body 101. The unit 102 and the light source unit 103 attached to the upper part of the lamp body 101 so as to close the opening together with the display panel unit 102 are provided. The display panel unit 102 includes a light guide plate 104 that irradiates light from the light source unit 103 incident from the upper end surface forward, a display panel 105 that is disposed in front of the light guide plate 104, and the like. The operation principle of the light guide plate 104 in this guide light will be explained. As shown in FIG. 8, the light incident from the upper end surface 104a of the light guide plate 104 (arrow a in FIG. 8) is printed on the back surface of the light guide plate 104. By abutting a V-shaped groove (both not shown), the traveling direction changes to the front, and the light is transmitted to the outside through the front surface 104b of the light guide plate 104 (arrow b in FIG. 8).

Here, the brightness of the display surface of the guide light is clearly defined, and is classified into class A, class B and class C according to the brightness, and class B is a BH type (high brightness type) according to the brightness. And BL type (low luminance type). In this conventional example, the corresponding lighting block is selected from a plurality of lighting blocks (lighting devices) having different outputs according to the grade, and the configuration of the display board unit 102 is changed. In the case of the BH type, a display panel 105a made of a transparent resin, a lens sheet 107 for condensing light, a diffusion sheet 108 for making the transparent portion of the display panel 105a appear white (FIG. 9A) In the case of the BL type, the display panel 105b made of milky white resin, the lens sheet 107, etc. are used (see FIG. 9B).
Japanese Patent Laid-Open No. 11-260134 (paragraph [0016] -paragraph [0018] and FIGS. 6-7)

  In the guide light shown in FIG. 7 described above, a corresponding lighting block is selected and incorporated from a plurality of lighting blocks so that the luminance can be adjusted according to each grade (BH type, BL type, etc.). In addition, since multiple types of guide lights are produced, it takes time to manage parts and products.

  The present invention has been made in view of the above problems, and an object thereof is to provide an indicator lamp capable of adjusting the surface brightness of a display panel in a plurality of stages while facilitating parts management and product management. is there.

  According to the first aspect of the present invention, a light guide plate that irradiates light incident from the end face forward, a first light source block that is disposed so as to face the end face of the light guide plate, a pattern on the front surface, and the front of the light guide plate. A second light source block provided behind the light guide plate, and brightness adjustment means for adjusting the brightness of the display panel by combining the first and second light source blocks. And

The invention of claim 2 is a light guide plate that irradiates light incident from the end face forward, a plurality of light source blocks each having a plurality of light sources and arranged to face the end face of the light guide plate, and a picture on the front surface. and a display panel disposed in front of a light guide plate, and a lighting circuit for supplying each lighting power to each light source block, the light source of each of the light source block, and side by side along the end face of each light guide plate A plurality of rows are arranged for each block, and brightness adjusting means for adjusting the brightness of the display panel by combining each light source block is provided, and the brightness adjusting means is provided for each light source block. The first connector and a plurality of second connectors that are provided in the lighting circuit and are detachably connected to the first connectors. The second connector is connected to the first connector. And adjusting the brightness of the display panel by selecting the state with respect to the state or the first connector to connect the data without connecting the second connector to the first connector for each of the respective.

According to a third aspect of the present invention, there is provided a light guide plate that irradiates light incident from the end face forward, a plurality of light sources arranged side by side so as to face the end face of the light guide plate, and a picture on the front surface that is in front of the light guide plate. And a lighting circuit that supplies lighting power to a plurality of light sources. The plurality of light sources are divided into a plurality of sets of light source blocks with a predetermined number of light sources arranged as one set of light source blocks. The brightness adjustment means for adjusting the brightness of the display panel by combining each light source block is provided, and the brightness adjustment means is provided in a first connector and a lighting circuit provided in each light source block. A plurality of second connectors that are detachably connected to the respective first connectors, wherein the second connector is connected to the first connector or to the first connector And adjusting the brightness of the display panel by selecting the state of not connecting the second connector to the first connector for each of the respective.

  According to the first aspect of the present invention, the surface brightness of the display panel can be adjusted in a plurality of stages by combining the first and second light source blocks by the brightness adjusting means, and both the first and second light source blocks can be adjusted. Since it is only necessary to use a lighting device with a capacity to light up and adjust the surface brightness of the display panel by combining each light source block, parts management is easier than in the conventional example, and one type of indicator lamp is produced. Therefore, there is an effect that product management becomes easy.

  According to the invention of claim 2, the surface brightness of the display panel is adjusted in a plurality of stages in the same manner as in claim 1 by combining a plurality of light source blocks arranged in a plurality of columns for each block by the brightness adjusting means. There is an effect that can be.

  According to the invention of claim 3, by combining a plurality of sets of light source blocks by the brightness adjusting means, the surface luminance of the display panel can be adjusted in a plurality of stages as in the case of claim 1. When a plurality of light sources are arranged in one row, the second light source block is provided behind the light guide plate as in claim 1 or the plurality of light sources are arranged in a plurality of rows as in claim 2. Compared with the case where it does, there exists an effect that the thickness of the whole lamp can also be made thin.

  Hereinafter, embodiments of an indicator lamp according to the present invention will be described with reference to the drawings. The indicator lamp according to the present invention is attached to, for example, a ceiling or a wall and used as a sign for evacuation guidance. In the following description, unless otherwise specified, the direction of the arrow ab in FIG. 1 is the vertical direction, the direction of the arrow cd is the front-rear direction, and the direction of the arrow ef is the left-right direction.

(Embodiment 1)
FIG. 1 shows an indicator lamp A according to Embodiment 1, which is attached to the lamp body 1 so as to close the opening, and a substantially rectangular box-shaped lamp body 1 whose front side (arrow c side in FIG. 1) is opened. A light source unit 2, a light guide plate 3 disposed in front of the light source unit 2, and a display panel 4 having a display pattern B on the front surface and disposed in front of the light guide plate 3.

  The lamp body 1 is, for example, a synthetic resin molded product, and is used to introduce a power line (not shown) for supplying commercial power to the center of the upper side wall into the lamp body 1 from above. A knockout 1a is provided, and screw insertion holes 1b and 1b through which fixing screws (not shown) are inserted are respectively provided on both sides of the knockout 1a (in the direction of arrows ef in FIG. 1). In addition, a knockout 1c for introducing the power line into the lamp body 1 from the back side is provided at a substantially upper center portion on the bottom surface (back surface) of the lamp body 1, and the knockout 1c is provided on both left and right sides of the knockout 1c. The screw insertion holes 1d and 1d through which fixing screws (not shown) are inserted are respectively penetrated. That is, in this embodiment, the lamp body 1 can be attached to the ceiling by using the screw insertion holes 1b and 1b, and the lamp body 1 can be attached to the wall by using the screw insertion holes 1d and 1d. . In the case of ceiling mounting, the power line is introduced into the interior of the lamp body 1 through a hole formed by opening the knockout 1a. In the case of wall mounting, the power line is inserted through a hole formed by opening the knockout 1c. A power line is introduced into the lamp body 1.

  Further, on the inner side surfaces of the left and right side walls of the lamp body 1, engagement protrusions 1 e having a substantially L shape with which engagement protrusions 2 c provided at both left and right ends of the unit body 2 a constituting the light source unit 2 are engaged. Are projected in two along the vertical direction.

  Here, in the lamp body 1, there are a terminal block 9, a storage battery 8 for supplying power during a power failure, a lighting circuit 7 a (see FIG. 2), a plurality of light sources 5 and 6 and a situation of the storage battery 8 (described later). For example, a lighting control block 7 having a self-inspection function for checking the charging state of the storage battery 8 and the like and having a control circuit for controlling the lighting circuit 7a is housed. Here, the lower side wall of the lamp body 1 displays a self-inspection switch (not shown) for self-inspection, a replacement time of the storage battery 8, and the like, for example, a display unit (not shown) made of LEDs. A plurality of exposure holes 1f are provided for exposing the storage battery 8 and the like, so that the self-inspection can be performed by pressing the self-inspection switch from the outside, and the charging state and replacement time of the storage battery 8 can be easily confirmed. be able to. When the power line introduced into the lamp body 1 is connected to the terminal block 9 through the knockout 1a or the knockout 1c, the commercial power supplied through the power line is normally supplied to the lighting circuit 7a and the storage battery 8 In the event of a power failure, the storage battery 8 is discharged and power is supplied to the lighting circuit 7a.

  The light source unit 2 is, for example, a synthetic resin molded product, and includes a unit body 2a having a substantially rectangular plate shape that is formed to have substantially the same size as the opening of the lamp body 1, and protrudes forward from the upper portion of the unit body 2a. The projecting base portion 2b is integrally provided. Moreover, the 1st light source block 17 by which the several light source 5 which consists of LED, for example was arrange | positioned side by side is provided in the lower surface of the protrusion part 2b, and also it consists of LED in the front surface (main surface) of the unit main body 2a. A second light source block 18 in which a plurality of light sources 6 are arranged in a grid pattern is provided. The first light source block 17 is connected to the connector 10 a via the electric wire 12, and the second light source block 18 is connected to the connector 11 a via the electric wire 12. Here, the output terminals of the lighting circuit 7a are connected to the connectors 10b and 11b that are electrically connected to the connectors 10a and 11a, respectively. By connecting the connector 10a and the connector 10b, the lighting circuit 7a The lighting power E is supplied to the first light source block 17, and the lighting power E is supplied from the lighting circuit 7a to the second light source block 18 by connecting the connector 11a and the connector 11b.

  Further, at the left and right end portions of the unit main body 2a, engagement protrusions 2c that engage with the corresponding engagement protrusions 1e are respectively provided at portions corresponding to the engagement protrusions 1e of the lamp body 1 (see FIG. 1, only the right side is shown), and the light source unit 2 is attached to the lamp body 1 by engaging each engaging protrusion 2c with the corresponding engaging protrusion 1e.

  The light guide plate 3 is, for example, a transparent acrylic resin molded product, and is a rectangular plate having substantially the same dimensions as the outer dimensions of the main surface of the unit main body 2a described above (the flat surface portion excluding the projecting portion 2b from the unit main body 2a). And is arranged in front of the main surface of the unit main body 2a. At this time, the plurality of light sources 5 constituting the first light source block 17 are arranged so as to face the upper end surface of the light guide plate 3, and the light emitted from each light source 5 is transmitted from the upper end surface of the light guide plate 3 to the light guide plate. 3, and after being reflected a plurality of times inside the light guide plate 3, the light is uniformly irradiated from the front surface (surface on the display panel 4 side) of the light guide plate 3.

  On the other hand, the display panel 4 is, for example, a synthetic resin molded product, and is formed in a rectangular plate shape having substantially the same dimensions as the light guide plate 3 described above. For example, a display pattern B configured by a pictogram imitating a person is formed. Printed on the front. The display panel 4 is attached to the main surface of the unit main body 2a together with the light guide plate 3 by appropriate attachment means.

  Next, the procedure for assembling the indicator lamp A will be described with reference to FIGS. In the following description, it is assumed that the storage battery 8 and the terminal block 9 and the lighting control block 7 and the terminal block 9 are connected in advance by electric wires (not shown). First, the light guide plate 3 and the display panel 4 are attached to the main surface (front surface) of the unit main body 2a by appropriate attachment means. At this time, the plurality of light sources 5 constituting the first light source block 17 are arranged to face the upper end surface of the light guide plate 3. When it is necessary to turn on the first light source block 17, the connector 10a is connected to the corresponding connector 10b. When it is not necessary to turn on the first light source block 17, the connector 10a is not connected. As for the connector 11a, when the second light source block 18 needs to be turned on, the connector 11a is connected to the corresponding connector 11b, and when the second light source block 18 does not need to be turned on, the connector 11a is not connected. Connect.

  Thereafter, when the light source unit 2 assembled with the light guide plate 3 and the display panel 4 is attached to the front side (opening side) of the lamp body 1 and the light source unit 2 is slid downward with respect to the lamp body 1, the unit body The engaging protrusions 2c at the left and right ends of 2a engage with the corresponding engaging protrusions 1e, the light source unit 2 is attached to the lamp body 1, and the assembly of the indicator lamp A is completed. In this state, each engagement protrusion 2c is in contact with the lower piece of the corresponding engagement protrusion piece 1e, so that the downward movement is restricted, and the engagement protrusion piece 1e is in contact with the vertical piece. Thus, the forward movement is restricted, and the light source unit 2 is prevented from falling off.

  Here, for example, when the display lamp A of this embodiment is used as a BL-type guide lamp, the connector 10a connected to the first light source block 17 in FIG. 2 is connected to the connector 10b on the lighting circuit 7a side and Since the connector 11a connected to the two light source block 18 is not connected, the lighting power E is supplied only to the first light source block 17, so that only the first light source block 17 is turned on. As a result, the display panel As the surface brightness of 4, the brightness required for the BL-type guide light is secured. On the other hand, when the indicator lamp A of the present embodiment is used as a BH type guide lamp, the first and second light sources are connected by connecting the connector 10a to the connector 10b and the connector 11a to the connector 11b in FIG. Since the lighting power E is supplied to each of the blocks 17 and 18, both the light source blocks 17 and 18 are turned on. As a result, the luminance required for the BH type guide lamp is secured as the display luminance of the display panel 4. . Here, the brightness adjusting means is constituted by the connectors 10a and 10b and the connectors 11a and 11b. The connection between the connectors 10a and 10b and the connection between the connectors 11a and 11b are performed in accordance with the specifications (that is, the BL type or the BH type) in the assembly procedure of the indicator lamp A described above.

  Thus, according to the present embodiment, the combination of the first light source block 17 according to the connection state between the connectors 10a and 10b and the second light source block 18 according to the connection state between the connectors 11a and 11b, that is, By turning on one or both of the first and second light source blocks 17, 18, the surface brightness of the display panel 4 can be adjusted in a plurality of stages, and both the first and second light source blocks 17, 18 are turned on. Since it is only necessary to adjust the surface brightness of the display panel 4 by combining the light source blocks 17 and 18 using the lighting circuit 7a having a capacity, the parts management becomes easier compared to the conventional example, and the display to be produced. Since there is only one type of lamp A, there is an advantage that product management becomes easy.

  In the present embodiment, the brightness adjusting means is composed of the connectors 10a and 10b and the connectors 11a and 11b, and one or both of the first and second light source blocks 17 and 18 are turned on according to the connection state of the connectors. Although the surface brightness of the display panel 4 is adjusted, the brightness adjustment means is not limited to this embodiment, and the surface brightness of the display panel 4 can be increased by combining the first and second light source blocks 17 and 18. Anything that can be adjusted is acceptable. Therefore, for example, the surface brightness of the display panel 4 may be adjusted by adjusting the output level of each of the light source blocks 17 and 18 by the lighting control block 7.

(Embodiment 2)
Embodiment 2 of the indicator lamp according to the present invention will be described below. As shown in FIG. 3, the display lamp A of the present embodiment includes a lamp body 1, a light source unit 2, a light guide plate 3, and a display panel 4. The first light source block 17 is provided on the lower surface, and the second light source block 18 is provided on the main surface of the unit body 2a. A light source block 20 including a plurality of light sources 14 is arranged on the front side, and the light source block 20 is arranged on the rear side. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  The light source unit 2 of the present embodiment has a rectangular plate-shaped unit body 2a, and a projecting part 2b protruding forward is integrally provided on the upper part of the unit body 2a, and on the lower surface of the projecting part 2b, For example, a light source block 19 in which a plurality of light sources 13 made of LEDs are arranged side by side and a light source block 20 in which a plurality of light sources 14 made of LEDs are arranged side by side are the light source block 19 on the front side and the light source block 20 on the rear side. Are arranged in two rows. The light source block 19 is connected to the connector 10 a via the electric wire 12, and the light source block 20 is connected to the connector 11 a via the electric wire 12. In the assembled state, the light sources 13 and 14 constituting the light source blocks 19 and 20 are arranged to face the upper end surface of the light guide plate 3. Here, in this embodiment, since the light source blocks 19 and 20 are arranged in two rows on the lower surface of the projecting part 2b, the projecting dimension of the projecting part 2b is larger than that of the first embodiment.

  Here, for example, when the indicator lamp A of this embodiment is used as a BL-type guide lamp, the connector 10a connected to the light source block 19 in FIG. 4 is connected to the connector 10b on the lighting circuit 7a side and the light source block 20 is connected. Since the lighting power E is supplied only to the light source block 19 because the connector 11a connected to is not connected, only the light source block 19 is turned on. As a result, the surface brightness of the display panel 4 is BL type. The required brightness of the guide light is ensured. On the other hand, when the display lamp A of the present embodiment is used as a BH type guide lamp, the connector 10a is connected to the connector 10b and the connector 11a is connected to the connector 11b in FIG. Since the lighting power E is supplied, both the light source blocks 19 and 20 are turned on. As a result, the luminance required for the BH type guide lamp is ensured as the display luminance of the display panel 4. Here, the brightness adjusting means is constituted by the connectors 10a and 10b and the connectors 11a and 11b.

  Thus, according to the present embodiment, the combination of the light source block 19 according to the connection state between the connectors 10a and 10b and the light source block 20 according to the connection state between the connectors 11a and 11b, that is, the light source block 19, By turning on one or both of the light sources 20, the surface brightness of the display panel 4 can be adjusted in a plurality of stages as in the first embodiment.

  In the present embodiment, the brightness adjusting means is composed of the connectors 10a and 10b and the connectors 11a and 11b, and one or both of the light source blocks 19 and 20 are turned on in accordance with the connection state of the connectors, whereby the surface of the display panel 4 is displayed. Although the brightness is adjusted, the brightness adjusting means is not limited to this embodiment, and any means can be used as long as the surface brightness of the display panel 4 can be adjusted by combining the light source blocks 19 and 20. Therefore, for example, the surface brightness of the display panel 4 may be adjusted by adjusting the output level of each of the light source blocks 19 and 20 by the lighting control block 7.

  In this embodiment, the light source block has a two-row configuration, but the row configuration is not limited to two rows, and may be three or more rows.

(Embodiment 3)
Embodiment 3 of the indicator lamp according to the present invention will be described below. As shown in FIG. 5, the indicator lamp A of the present embodiment includes a lamp body 1, a light source unit 2, a light guide plate 3, and a display panel 4. In the second embodiment, the projection lamp 2b of the unit body 2a is provided. A light source block 19 composed of a plurality of light sources 13 is arranged on the front side and a light source block 20 composed of a plurality of light sources 14 is arranged on the rear side on the bottom surface. The light sources 15 and the plurality of light sources 16 constituting the light source block 22 are arranged side by side, and the light sources 15 and 16 are arranged every other light source. Other configurations are the same as those of the second embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  The light source unit 2 of the present embodiment has a rectangular plate-shaped unit body 2a, and a projecting part 2b protruding forward is integrally provided on the upper part of the unit body 2a, and on the lower surface of the projecting part 2b, For example, a plurality of light sources 15 and 16 made of LEDs are arranged side by side in a row. Further, as shown in FIG. 5B, each of the light sources 15 and 16 is arranged every other one, and includes a light source block 21 including a plurality of light sources 15 and a light source block 22 including a plurality of light sources 16. It is divided. Further, the light source block 21 is connected to the connector 10 a via the electric wire 12, and the light source block 22 is connected to the connector 11 a via the electric wire 12. In the assembled state, the light sources 15 and 16 constituting the light source blocks 21 and 22 are arranged to face the upper end surface of the light guide plate 3. Here, in this embodiment, since the light sources 15 and 16 are arranged in a row on the lower surface of the projecting portion 2b, the projecting dimension of the projecting portion 2b is smaller than that of the second embodiment.

  Here, for example, when the display lamp A of the present embodiment is used as a BL-type guide lamp, the connector 10a connected to the light source block 21 in FIG. 6 is connected to the connector 10b on the lighting circuit 7a side and the light source block 22 is used. Since the lighting power E is supplied only to the light source block 21 because the connector 11a connected to is not connected, only the light source block 21 is turned on. As a result, the surface brightness of the display panel 4 is BL type. The required brightness of the guide light is ensured. On the other hand, when the display lamp A of the present embodiment is used as a BH type guide lamp, the connector 10a is connected to the connector 10b and the connector 11a is connected to the connector 11b in FIG. Since the lighting power E is supplied, both the light source blocks 21 and 22 are turned on. As a result, the luminance required for the BH type guide lamp is ensured as the display luminance of the display panel 4. Here, the brightness adjusting means is constituted by the connectors 10a and 10b and the connectors 11a and 11b.

  Thus, according to the present embodiment, the light source block 21 according to the connection state between the connectors 10a and 10b and the light source block 22 according to the connection state between the connectors 11a and 11b, that is, the light source block 21, The surface brightness of the display panel 4 can be adjusted in a plurality of stages as in the first embodiment by turning on one or both of the light sources 22. In addition, the second light source block 18 is arranged behind the light guide plate 3 as in the first embodiment by arranging the plurality of light sources 15 and 16 constituting the light source blocks 21 and 22 in one row as in the present embodiment. Compared to the case where the light source blocks 19 and 20 have a two-row configuration as in the second embodiment, the thickness of the entire lamp can also be reduced.

  In the present embodiment, the brightness adjusting means is composed of the connectors 10a and 10b and the connectors 11a and 11b, and one or both of the light source blocks 21 and 22 are turned on in accordance with the connection state of the connectors, whereby the surface of the display panel 4 is displayed. Although the brightness is adjusted, the brightness adjusting means is not limited to this embodiment, and any means can be used as long as the surface brightness of the display panel 4 can be adjusted by combining the light source blocks 21 and 22. Therefore, for example, the surface brightness of the display panel 4 may be adjusted by adjusting the output level of each of the light source blocks 21 and 22 by the lighting control block 7.

  Further, in the present embodiment, every other light source 15, 16 constituting each light source block 21, 22 is arranged, but the arrangement of the light sources is not limited to this embodiment, and each light source The light source of a block may be arrange | positioned every predetermined number according to the number of blocks. Furthermore, the number of sets of light source blocks is not limited to this embodiment, and a configuration in which three or more sets are combined may be used.

It is a disassembled perspective view which shows the indicator lamp of Embodiment 1. FIG. It is a circuit diagram which shows the same as the above. It is a disassembled perspective view which shows the indicator lamp of Embodiment 2. FIG. It is a circuit diagram which shows the same as the above. The indicator lamp of Embodiment 3 is shown, (a) is a disassembled perspective view, (b) is a principal part enlarged view. It is a circuit diagram which shows the same as the above. It is a disassembled perspective view which shows the indicator lamp of a prior art example. It is explanatory drawing explaining operation | movement of the light-guide plate used for the same as the above. (A) and (b) are exploded perspective views of the display panel unit used in the above.

Explanation of symbols

3 Light guide plate 4 Display panel 10a, 10b, 11a, 11b Connector (brightness adjusting means)
17 1st light source block 18 2nd light source block A Indicator lamp B Display pattern (pattern)

Claims (3)

  A light guide plate for irradiating light incident from the end face forward; a first light source block arranged to face the end face of the light guide plate; a display panel having a picture on the front face and arranged in front of the light guide plate; A second light source block provided behind the light guide plate, and a brightness adjusting means for adjusting the brightness of the display panel by combining the first and second light source blocks. light. A light guide plate to irradiate the light incident from the end face to the front, a plurality of light source blocks being arranged so as to face the end face of the light guide plate has a plurality of light sources respectively, the light guide plate has a pattern on a front surface A display panel disposed in front of the lighting circuit, and a lighting circuit for supplying lighting power to each of the light source blocks ,
Each of the light sources of the light source blocks are arranged in a plurality of rows and for each block, respectively side by side along the end face of the light guide plate, to adjust the brightness of the display panel by combining each of the light source blocks Brightness adjustment means are provided,
The brightness adjusting means includes a first connector provided in each of the light source blocks, and a plurality of second connectors provided in the lighting circuit and detachably connected to the first connectors. The display is performed by selecting, for each of the first connectors, a state in which the second connector is connected to the first connector or a state in which the second connector is not connected to the first connector. An indicator light that adjusts the brightness of the panel . A light guide plate to irradiate the light incident from the end face to the front, a plurality of light sources are arranged so as to face the end face of the light guide plate, a display disposed in front of the light guide plate has a pattern on a front surface A panel, and a lighting circuit for supplying lighting power to the plurality of light sources ,
Wherein the plurality of light sources, brightness to adjust the brightness of the display panel by being divided into a plurality of sets of light source blocks a light source is arranged at a predetermined number of intervals as a set of light source blocks, combining each of the light source blocks Adjustment means are provided,
The brightness adjusting means includes a first connector provided in each of the light source blocks, and a plurality of second connectors provided in the lighting circuit and detachably connected to the first connectors. The display is performed by selecting, for each of the first connectors, a state in which the second connector is connected to the first connector or a state in which the second connector is not connected to the first connector. An indicator light that adjusts the brightness of the panel .

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