JP4718144B2 - Light source structure of internally illuminated bulletin board - Google Patents

Description

  The present invention relates to a structure of a light source of an internally lit display that displays information such as advertisements and various information by illuminating a light-transmitting display panel with characters and pictures on its surface from behind.

  As an internally illuminated display, for example, as shown in FIG. 6, a light reflecting plate 72 and a fluorescent lamp 73 are installed in a housing 71 surrounded by a side plate 71b around the bottom plate 71a. Has a configuration in which a light transmissive display panel 74 is arranged and the display panel 74 is transmitted and illuminated by the light of the fluorescent lamp 73 (see, for example, Patent Document 1).

JP 2000-56715 A

The conventional internally-illuminated bulletin board is configured so that the display panel 74 is uniformly illuminated by a light reflecting plate 72 disposed between the fluorescent lamp 73 and the display panel 74, but the fluorescent lamp 73 is used as a light source. Therefore, it is necessary to install sockets, inverters, ballasts, and other appliances inside the housing 71. The bulletin board must be formed in a size that allows these devices to be installed. It was difficult to do. Even if the instrument can be stored compactly, the housing 71 cannot be formed thinner than the tube diameter of the fluorescent lamp 73.
An edge-light type is also known as an internally-illuminated thin-type billboard, but this uses a light guide plate, which makes the billboard heavier, and also the panel surface than directly irradiating with light source light There is a problem of darkening.

  In view of the above-described problems of the prior art, the present invention is designed to reduce the thickness of the light source of the internally illuminated display and to uniformly irradiate the light source light without causing uneven illumination on the display panel. In addition, it is an object of the present invention to be able to flexibly cope with the case where the internally illuminated bulletin board is installed in a space having a desired size and shape.

In order to solve the above-described problems, the present invention provides a light source structure for an internally-illuminated bulletin board that illuminates a light-transmissive display panel by illuminating light from behind and displays information attached to the display panel. A planar light source configured by mounting a plurality of point light sources composed of chip-type LEDs on the surface at appropriate intervals, an average bubble diameter of 10 μm or less, and a total reflectance of 99% or more; A light reflecting plate made of MCPET (registered trademark, manufactured by Furukawa Electric Co., Ltd.), which is a thermoplastic polyester foam sheet that is made flame-retardant on the surface in contact with the dot-like light source at the mounting-corresponding position. A light reflecting plate formed so as to be able to cover the substrate of the planar light source by forming a through hole having a size through which the light source penetrates, and mounting holes are respectively provided in the substrate of the planar light source and the light reflecting plate. position to correspond provided, before The light reflecting plate is superimposed on the side of the surface light source where the point light source is mounted, and the light reflecting plate is exposed from the through hole through the point light source mounted on the substrate to the through hole of the light reflecting plate. Rutotomoni contacting the backside surface of the substrate, by which to penetrate the locking rivet into the mounting hole overlaps the substrate of the light reflection plate is connected and fixed integrally with the light reflecting plate and the planar light source A light source having a thickness obtained by superimposing the light reflecting plate on the substrate is provided.

In the above structure, the mounting holes are provided in the surface light source substrate and the light reflecting plate so as to correspond to each other, the light reflecting plate is overlapped on the surface of the substrate, and the top portion is painted white in the overlapping mounting holes of both members. Further, it is possible to configure by connecting and fixing both members by penetrating the locking rivets .
The substrate on which the point light source is mounted is divided into a plurality of unit substrates vertically and horizontally by slits arranged vertically and horizontally in the plate, and each unit substrate is bridged between adjacent unit substrates across the slit. Electrically and mechanically connected with joint pieces, and electrically connected via a feeding path provided on the joint pieces, and can be configured by forming attachment holes with light reflecting plates on each unit board. .

According to the present invention, since a planar light source is configured by arranging a plurality of point light sources on a substrate as a light source, the thickness is smaller than a spherical light source such as a light bulb or a bar light source such as a fluorescent lamp. The entire illuminated bulletin board can be made thin and lightweight.
The luminous flux that illuminates the light transmissive panel can be secured by mounting a large number of point light sources on the substrate, and the point light sources are mounted on the surface of the substrate with a uniform spacing and stacked on the substrate. By installing a light reflection plate having a high total reflectance, it is possible to illuminate the display panel evenly with high luminance and emit uniform light from the panel.
In addition, the board is divided into a plurality of slits so that the board can be cut to the required size according to the place where the signage is installed. In addition, it is possible to install a billboard, and it is possible to easily construct a planar light source having a desired shape and size by combining a plurality of substrates of appropriate shapes, and display various shapes and sizes. It is possible to flexibly configure the light source for the panel.

A preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows the structure of an example of an internally-illuminated bulletin board to which the light source structure of the present invention is applied. This bulletin board 1 has a planar light source 3, a light reflector 4, and a light source 3 in a housing 2 opened on one side. Are stacked and a light transmissive display panel 5 is attached to the opening surface of the housing 2.

The planar light source 3 is formed by mounting a large number of chip-type LEDs 32 as point light sources on the surface of a substrate 31 of an appropriate size.
Specifically, the substrate 31 is a multilayer substrate formed with a thickness of about 1 mm by laminating a power supply layer and a ground layer through an insulating layer inside, and a pattern of a light emitting circuit is arranged on both front and back surfaces, and on the surface. The LED 32 mounting portion and the back surface (not shown) are each formed with a mounting portion for circuit components other than the LED 32, and is mounted on the surface by applying a voltage from a power supply terminal mounted on the back surface of the substrate. Each LED 32 is made to emit light.

In addition, as shown in FIG. 2, in the plate of the substrate 31, two slits 31 a and 31 a extending vertically from the left and right sides of the substrate 31 and equally spaced from both the upper and lower sides of the substrate 31 are provided. The three slits 31b, 31b, 31b extending horizontally are divided into a total of twelve unit substrates 31A, and each unit substrate 31A is bridged between adjacent unit substrates 31A, 31A across each slit. It is formed by connecting electrically and mechanically with a plurality of joint pieces 31c that have been passed, and by cutting along the joint pieces 31c, each unit board 3A or each unit board in which a plurality of boards 31 are connected. It can be divided every 31A.

This electrically and mechanically connected portion of the path is divided into alternately on the surface connecting path and back connecting path, it is desirable to provide a connection path.

As shown in FIG. 3, each unit substrate 31A has mounting holes 31d and 31d of a light reflecting plate 4 to be described later formed at substantially the center thereof, and a total of 12 LEDs 31 are vertically and horizontally arranged around the unit substrates 31A. It is mounted at intervals. A power supply terminal mounting portion is provided on the back surface of the unit substrate 31A. Further, the unit substrates 31A adjacent to the left and right across the slits 31a and 31a are integrally formed via three joint pieces 31c, and the unit substrates 31A adjacent to the top and bottom across the slits 31b and 31b are five. The joint piece 31c is formed integrally.

  In addition, a power supply layer and a ground layer, which are power supply paths, are stacked inside each joint piece 31c, and if a voltage is applied to the power supply terminal of one unit substrate 31a in the board 31, the joint piece 31c is interposed. Thus, a voltage is applied to all unit substrates 31A to be connected, and the LEDs 32 mounted on each unit substrate 31A can emit light. Further, even when the joint piece 32c is cut and divided into a single unit substrate 31A, the LED 32 mounted on the substrate surface can emit light by applying a voltage from the power supply terminal mounted on the back surface thereof. Yes.

  The light reflecting plate 4 is formed of a plate material having a white surface and a high total reflectivity in the same shape and the same size as the substrate 31, and the LED 32 mounted on the substrate 31 is formed in the plate as shown in FIG. A through-hole 41 having a size that penetrates substantially fully is provided at a position corresponding to the mounting position of each LED 32. An attachment hole 42 is also provided in the plate of the light reflecting plate 4 so as to correspond to the attachment hole 31 d of the substrate 31.

  If a light diffusing material, a prism, or an aspherical lens is inserted into the through hole 41 of the light reflecting plate 4 to diffuse the light, it is desirable to make the thickness thinner than allowing the light of the LED 32 to pass through a simple hole.

The light reflecting plate 4 is preferably composed of a thermoplastic polyester foam sheet having fine bubbles having an average cell diameter of 50 μm or less, a thickness of 200 μm or more and a specific gravity of 0.7 or less. Among the light reflectors on the market, it has an average bubble diameter of 10 μm or less, a visible light total reflectance of 99% or more, a heat distortion temperature of 177 ° C., and an aluminum foil on the back surface. A flame-retardant thermoplastic polyester foam sheet (trade name: MCPET (registered trademark) , manufactured by Furukawa Electric Co., Ltd.) is suitable.

As shown in FIG. 5, the planar light source 3 and the light reflection plate 4 overlap the light reflection plate 4 on the surface of the substrate 31 on which the LEDs 32 are mounted, and each LED 32 is inserted into each through hole 41 to emit light. The top portion is exposed from the hole 41, and the back surface of the light reflecting plate 4 is brought into contact with the surface of the substrate 31, and the protruding portion 61 of the locking rivet 6 from the front surface side to the back surface side in the overlapping mounting holes 31d and 42 of both members. By connecting the receiving part 62 to the protrusion 61 on the back surface side and tightening, the light emitting surface of the planar light source 3 excluding the LED 32 is covered with the light reflection 4 so that both members are connected together. Can be fixed. The top of the protrusion 61 of the locking rivet 6 is preferably painted in the same color as the light reflecting plate 4.

As shown in FIG. 1, the planar light source 3 and the light reflecting plate 4 that are integrally connected can be used as a light source that is installed in the housing 2 of the bulletin board 1 and illuminates the display panel 5 from the inside. In addition, since the light source is as thin as the thickness of the substrate 31 and the light reflecting plate 4 stacked, the entire billboard 1 can be made thin.

  Since the planar light source 3 is formed by mounting a large number of LEDs 32 at a uniform interval on the surface of the substrate 31, the display panel 5 is illuminated with sufficient brightness by the light emitted from each LED 31. The light reflecting plate 4 superimposed on the light source 3 efficiently reflects the light emitted from each LED 32 to the display panel 5 side, illuminates the display panel 5 evenly with high brightness, and emits uniform light from the panel. Can be made.

  Further, for example, when the bulletin board 1 is installed in a narrow space where a fluorescent lamp cannot be installed, the substrate 31 is divided into a width corresponding to the space, and the light reflector 4 along the size of the divided substrate 31. By forming the light source, it is possible to configure a light source having a desired size and shape according to the installation space. In the case of a wide installation space, a plurality of substrates 31 can be juxtaposed on a plane, and the light reflecting plate 4 can be stacked on each substrate 31.

  In the illustrated embodiment, the substrate is formed so as to be divided into 12 unit substrates. However, the unit of division is not limited to this, and the number of mounted LEDs and the mounting position are the size of the substrate and the output of the LED. It is possible to select appropriately according to the light flux necessary for irradiation of the front panel. Moreover, although the form which mounted chip-type LED as a point light source was shown, it is arbitrary to use LED and a point light source of another form.

It is the figure which showed the structure of an example of the internally-illuminated bulletin board to which this invention is applied. It is an external view of an example of the planar light source which comprises the light source of FIG. FIG. 3 is an enlarged external view of one unit substrate of the planar light source of FIG. 2. It is an external view of an example of the light reflection board which comprises the light source of FIG. (A), (B) is a principal part expanded sectional view of both members which shows the process of connecting a planar light source and a light reflection board. It is the figure which showed the structure of an example of the conventional internal lighting type bulletin board.

Explanation of symbols

1 Display Unit, 2 Housing, 3 Planar Light Source, 31 Substrate, 31A Unit Substrate, 32 LED, 4 Light Reflector, 41 Through-hole, 5 Display Panel, 6 Locking Rivet

Claims (3)

In the light source structure of the internally lit display panel that illuminates and transmits light from behind the light transmissive display panel and posts information attached to the display panel,
A planar light source configured by mounting a plurality of point light sources composed of chip-type LEDs on the surface of the substrate at appropriate intervals;
A light reflector made of MCPET (registered trademark), which is a thermoplastic polyester foam sheet having an average bubble diameter of 10 μm or less and a total reflectance of 99% or more, and a surface in contact with the substrate made flame-retardant. A light reflecting plate formed so as to be able to cover the substrate of the planar light source by forming a through-hole having a size through which the dotted light source penetrates at a mounting corresponding position of the dotted light source;
Mounting holes are provided corresponding to the positions of the substrate of the planar light source and the light reflection plate, respectively.
The light reflecting plate is superposed on a side where the point light source of the planar light source is mounted, and the light reflecting plate is exposed from the through hole through the point light source mounted on the substrate to the through hole of the light reflecting plate. backside is brought into contact with the surface of the substrate Rutotomoni, to connecting and fixing the substrate and the planar light source is passed through the locking rivet into the mounting hole overlapping of said light reflector and the light reflecting plate integrally Thus, the light source structure of the internal lighting type display device is configured as a light source having a thickness in which the light reflecting plate is overlapped on the substrate. 2. A light source structure for an internally illuminated display device according to claim 1, wherein a locking rivet whose top portion is painted white is passed through an overlapping mounting hole of the substrate of the planar light source and the light reflecting plate, and both members are connected and fixed. The substrate on which the point light source is mounted is divided into a plurality of unit substrates vertically and horizontally by slits arranged vertically and horizontally in the plate, and each unit substrate is bridged between adjacent unit substrates across the slit. The joint piece is electrically and mechanically connected, and is electrically connected via a feeding path provided in the joint piece, and each unit board is provided with a mounting hole for a light reflecting plate. The light source structure of the internally illuminated bulletin board according to claim 1 or 2.

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