JP2010286600A - Double-sided illuminator and double-sided advertisement-type internally illuminated signboard incorporating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel double-sided light-emitting body using LED elements; and to provide a novel inside lighting type signboard of double-sided advertisement type incorporating the same. <P>SOLUTION: The double-sided light-emitting body 1 is a face light-emitting body including: a substrate 11 having electric wiring 12; and a plurality of LED elements 13 arranged substantially regularly for the substrate 11. The electric wiring 12 is formed on only one face of the substrate 11. The LED elements 13 provided on the substrate 11 are opposingly provided to make light-emitting faces face both sides of the substrate 11. The substrate 11 is flexible and is freely curved or bent and has a top film 14 covering the LED elements 13 from above. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a surface light emitter using a plurality of LED elements and an internally illuminated signboard incorporating the light emitting element as a light source, and is particularly suitable for a double-sided advertisement-type internally illuminated signboard viewed from both sides. The present invention relates to a double-sided illuminant and a double-sided advertisement-type internally illuminated signboard.

Conventionally, fluorescent lamps have been often used as the light source for internally illuminated signboards, but they have a longer lifespan, lower power consumption, and can produce a variety of colors. LED elements have also been used. For example, Patent Documents 1 and 2 have already been devised as double-sided advertisement type internally illuminated signboards in which LED elements are applied as light sources.
Among these, Patent Document 1 is to increase the alerting power of a signboard by, for example, turning on display characters in a stroke order by a plurality of LED elements. However, since this patent document 1 does not assume a double-sided advertisement type signboard from the beginning, it does not describe a specific structure of how to arrange LED elements to enable double-sided advertisement. Incidentally, in this patent document 1, it is described that not only the front and back surfaces (left and right) of the signboard but also the third and fourth surfaces are the viewing surfaces, and in FIG. In consideration of this, in the case where a plurality of viewing surfaces are taken into consideration, it is considered that a plurality of signboards (in other words, single-sided advertising billboards) having only one viewing surface are provided. It is done.
However, even if a high alerting force is obtained, many LED elements and other components are required as a signboard, and it is inevitable that the cost will increase.

On the other hand, Patent Document 2 describes a specific installation structure of LED elements. That is, in Patent Document 2, for example, as shown in FIG. 11, a reflecting plate 100 having front and back reflecting surfaces is inclined by, for example, about 60 degrees from the horizontal direction and mounted substantially horizontally from the upper and lower edges of the reflecting plate 100. A plate 110 is formed, and a light source device (illumination unit 120) having the LED element 13 'as a main member is installed therein. That is, the reflector 100 and the upper and lower mounting plates 110 are formed in a Z shape as viewed from the side, and are assembled into a double-sided advertising type internally illuminated signboard SB ′ by appropriately connecting them vertically and horizontally. It is. And when using this as a signboard, the illumination unit 120 is turned on, and the light emitted from the LED element 13 'is reflected on the front and back of the reflector 100 to produce an advertising effect on both sides of the signboard. .
In this patent document 2, compared to the case where a fluorescent lamp is used as the light source, it is effective in that it can easily handle signs of various sizes. However, the reflector 100 and the mounting plate 110 are formed in a Z shape. Since it is formed, the signboard thickness (distance from the front side to the back side) tends to be relatively large, and there is still room for improvement in this respect.

Utility Model Registration No. 3016684 Utility Model Registration No. 3133014

  The present invention has been made in view of such a background, and has fundamentally reviewed the structure of a double-sided light emitter suitably used for a double-sided advertisement-type internally illuminated signboard, and has a light-emitting surface of a pair of LED elements. A new double-sided illuminant and a double-sided advertisement-type interior-lit signboard are arranged to face the front and back sides.

  First, a double-sided light emitter according to claim 1 is a surface light emitter comprising a substrate having electrical wiring and a plurality of LED elements arranged substantially regularly with respect to the substrate. The LED element is formed only on one surface of the substrate, and the LED element provided on the substrate is mounted in a facing state so that the light emitting surface faces both sides of the substrate. Is.

  Further, in the double-sided light emitter according to claim 2, in addition to the requirement of claim 1, a flexible material that can be bent or bent is applied to the substrate, and the LED element is covered from above. Is provided with a top film.

  According to a third aspect of the present invention, in addition to the requirement of the first or second aspect, the pair of LED elements are provided so as to sandwich the substrate, and the substrate is provided with electric wiring. A slit is formed in the portion to be formed, and the LED element provided on the non-electrical wiring side is made conductive with the electric wiring by the slit.

The double-sided light emitter according to claim 4 has a pair of LED elements, in addition to the requirements of claim 1 or 2, wherein the pair of LED elements is sandwiched between brackets formed separately from the substrate. The LED element is provided in a conductive state,
When the LED element is mounted on the substrate, the bracket is provided on the substrate to mount the LED element.

  A double-sided advertisement type internally lit signboard incorporating a double-sided light emitter according to claim 5 comprises a display surface viewed from both the front and back sides of the signboard and a frame body that holds the display surface. In an internally illuminated signboard incorporating a double-sided light emitter, the double-sided light emitter according to the first, second, third or fourth aspect is applied.

The above-described problems can be solved by using the configuration of the invention described in each of the claims.
According to the first aspect of the present invention, since the double-sided light emitter is formed by arranging the LED elements so as to face both sides of the substrate, an extremely thin double-sided light emitter can be obtained. When the light source of the illuminated signboard is used, a double-sided advertisement-type signboard that is extremely thin and lightweight can be obtained.
Further, in the double-sided light emitter of the present invention, although LED elements are provided on both sides of the substrate, for example, a substrate (electrical wiring) is used together. Therefore, the total cost does not increase up to twice that of the single-sided light emitter. The cost can be reduced to about 8 to 1.5 times.

According to the second aspect of the present invention, since the substrate is flexible and the top film is provided from above the LED element, it is possible to obtain a signboard (display board) that is extremely thin and curved. That is, for example, in the conventional sleeve signboard, a fluorescent lamp is often used, and for that reason, it has a certain thickness and the appearance is a rectangular parallelepiped, but in the present invention, it is thin and display. A sleeve signboard with a curved surface can be formed.
In addition, since the top film is provided, high waterproofness and the like can be obtained. Therefore, even in an exposed state that is not accommodated in the signboard case, the double-sided light emitter can be used outdoors as a display board (advertisement display / information display).

  According to the third aspect of the present invention, since the slit is formed in the electric wiring portion of the substrate, the LED element on the non-electric wiring side can be energized even if the electric wiring is formed only on one side of the substrate. And make such a concrete structure real.

  According to the invention described in claim 4, since the pair of LED elements is previously provided on the bracket, the LED element is placed on the board simply by attaching the bracket to the board at the stage of manufacturing the double-sided light emitter. Can be mounted.

According to the invention described in claim 5, a double-sided advertisement-type internally illuminated signboard that is extremely thin and lightweight can be obtained. For this reason, when the internally illuminated signboard of the present invention is used as, for example, a sleeve signboard, it can be easily attached to a wall surface or the like. In addition, since the internally illuminated signboard of the present invention can be formed with a small side portion that is normally a non-display surface, space saving of the space for installing the signboard is achieved. For example, when placing a signboard at the entrance of a store The space in front of the store can be used effectively.
Further, in the internally illuminated signboard of the present invention, although LED elements are provided on both sides of the substrate, for example, since the substrate (electrical wiring) is used in combination, the total is twice that when a single-sided light emitter is applied. The signage cost can be reduced.

The perspective view (a) which shows the Example which used the double-sided advertisement type internal lighting signboard incorporating the double-sided light-emitting body of this invention as a sleeve signboard, and the cross section which shows the internal structure of this internal-lighting signboard skeleton FIG. It is a perspective view which shows a double-sided light-emitting body same as the above skeleton. It is the front view (a) which shows one unit (1 unit) which modularized the double-sided light-emitting body same as the above, and frame | skeleton sectional drawing (b). It is explanatory drawing which shows the vacuum pressure bonding method at the time of extending | stretching a top film in the close_contact | adhered state with respect to a board | substrate in steps. It is explanatory drawing which shows an example of the mesh-like circuit which energizes the LED element which detoured around this defect | deletion part even if a defect | deletion part exists in a board | substrate (electrical wiring). It is explanatory drawing which shows the other Example of a mesh circuit same as the above. It is explanatory drawing which shows other Example of a mesh circuit same as the above. It is an Example which used the double-sided light-emitting body of this invention as a double-sided advertisement type display board in the exposed state, and is explanatory drawing which shows the Example installed curvedly the display surface (double-sided light-emitting body). It is a perspective view which shows the other Example which formed the double-sided light-emitting body, after attaching a pair of LED element to the bridge-shaped bracket made from a conductive metal, and attaching this bracket to a board | substrate. It is a perspective view which shows the other Example which formed the double-sided light-emitting body, after attaching a pair of LED element to the flat strip-shaped bracket and attaching this bracket to the board | substrate with which the opening part was formed. The perspective view (a) which shows the conventional double-sided advertisement type internally-illuminated signboard using an LED element, the side sectional view (b) which shows the internal structure of the signboard, and the perspective view which shows the illumination unit incorporated in the signboard (C).

The mode for carrying out the present invention includes one described in the following examples, and further includes various methods that can be improved within the technical idea.
In the description, first, a configuration example of the double-sided light emitter 1 of the present invention will be described, and then, characteristic items for manufacturing the double-sided light emitter 1 will be described. A double-sided advertisement type internally illuminated signboard SB incorporating 1 will be described.

The double-sided light emitter 1 of the present invention comprises a substrate 11 having electrical wiring 12 and a plurality of LED elements 13 arranged almost regularly with respect to the substrate 11. As one example, a pair of LED elements 13 may be provided so that the light emitting surfaces of the LED elements 13 face both the front and back surfaces of the substrate 11. Therefore, for example, as shown in FIGS. 1 and 2, the LED elements 13 are provided on both surfaces (on both sides) of the substrate 11 so that the paired LED elements 13 sandwich the substrate 11.
Further, the electrical wiring 12 is formed on only one of the front side or the back side (front side or back side) of the substrate 11, which is one of the major features of the present invention. Note that there is no clear distinction between the front side and the back side (front side and back side) of the substrate 11. Here, the side on which the electrical wiring 12 is formed is referred to as the front side for convenience, and the electrical wiring 12 The side that is not formed is the back side.
Further, the double-sided light emitter 1 in this embodiment comprises a top film 14 stretched from above the substrate 11 so as to cover the LED element 13 in addition to the substrate 11 and the LED element 13. Hereinafter, each of these constituent members will be described.

  First, the substrate 11 will be described. The substrate 11 serves as a base member to which the LED elements 13 are regularly attached (mounted), has a film shape or a sheet shape, and has insulating properties and flexibility (curved or bendable properties). Various materials can be applied (especially, in this embodiment, a material that is excellent in flexibility and can be curved freely is applied). Examples of such materials include plastics (synthetic resins) from the viewpoint of convenience of handling and ease of processing. Particularly, polyethylene terephthalate, polyester, polyimide having excellent heat resistance, light resistance, mechanical strength, etc. It is desirable to apply vinyl chloride, epoxy resin, etc. Among them, white PET film is applied in this embodiment.

  Also, the substrate 11 (front surface) is provided with the electric wiring 12 for energizing the LED element 13 and lighting / flashing the LED element 13 as described above. In particular, in this embodiment, the substrate 11 (both surfaces) is formed. Even when the light emitter 1) is appropriately cut according to the desired shape or the like of the signboard (even when a part of the circuit is cut off), a wiring pattern for lighting / flashing all remaining LED elements 13 is taken. This will be described later.

  In forming the electrical wiring 12 on the substrate 11, for example, an appropriate wiring pattern set in advance is printed on one surface of a film or a sheet-like member (this is called a printed wiring, The desired electric wiring 12 is formed on the substrate 11 by attaching the printed wiring 12 so as to be superimposed on the substrate 11. More specifically, for example, a conductive silver paste is screen-printed on a sheet-like member to obtain a desired printed wiring 12, and the electrical wiring 12 is formed on the substrate 11 by bonding this to the substrate 12. To do. Of course, in order to form the electrical wiring 12 on the substrate 11, not only such printing method but also various methods such as vapor deposition and etching can be adopted.

  Further, in the present invention, the LED elements 13 are paired with respect to the substrate 11 (particularly, in the present embodiment, the LED elements 13 that form a pair so as to sandwich the substrate 11 are attached), the LED elements 13 on the front side or A slit 15 is formed in the substrate 11 (electrical wiring 12) for electrical connection between the electric wiring 12 and the LED element 13 on the back side. That is, the front side LED element 13 is energized by the electric wiring 12, but the back side LED element 13 cannot be energized as it is, so that the slit 15 is made to penetrate the substrate 11 at the site where the LED element 13 is to be provided. The LED element 13 is formed and electrically connected to the LED element 13 on the back side through the slit 15 (a pair of LED elements 13 are electrically connected to each other).

Next, the LED element 13 serving as a light source will be described. As described above, a plurality of LED elements 13 are regularly arranged with respect to the substrate 11. In particular, in the present invention, a pair of LED elements 13 are paired so that the light emitting surface faces the front and back surfaces of the substrate 11. Established. As an example, as shown in FIG. 3, the LED elements 13 are formed by arranging a pair of front and back that are arranged at regular intervals both vertically and horizontally.
The substrate 11 is preferably a unit having a certain size on which the LED element 13 is mounted in such a state (so-called modularization, which is referred to as 1 in this specification). In general, a plurality of units are connected (connected) or appropriately cut and used for actual use. That is, when the double-sided light emitter 1 is used for a signboard or the like, the modularized substrate 11 (double-sided light emitter 1) is connected vertically and horizontally, or cut appropriately, thereby finely responding to various signboard sizes. It is very convenient and easy to construct. Of course, wiring and the like can be easily performed by such unitization (modularization).
Here, a plurality of pairs of LED elements 13 are arranged at regular intervals in both the vertical and horizontal directions. When the double-sided light emitter 1 is applied to an internally illuminated signboard SB or the like, the dots of the LED elements 13 and unevenness of light are eliminated. This is because it does not occur, and the versatility (constructability) as a unit is further enhanced.

For example, as shown in FIG. 3, the single-sided double-sided light emitter 1 has a substrate 11 having a square size of 450 mm × 450 mm, and 12 single-sided × 12 (total 144) LED elements 13 are evenly arranged here. It is to be mounted (for example, about 600 g per unit). Incidentally, even when one unit of the double-sided light emitter 1 is appropriately cut and used for a signboard or the like, it is desirable to use at least about 24 LED elements 13 (for example, at least two rows). In addition, when one unit of the double-sided light emitters 1 is cut into a row (for example, two rows, three rows, etc.), the distance from the outer edge of the cut substrate 11 to the LED element 13 closest to the outer edge is the LED It is preferable to make it about half of the interval between the elements 13 in view of appearance.
Of course, the double-sided light emitter 1 is not necessarily limited to one of the above 450 × 450 (12 rows) (not only using this unit by cutting it appropriately), but by previously patterning several units. It is also possible to put it (in other words, module expansion). For example, as what is assumed as a standard pattern by the present applicant, in addition to the above 450 × 450 (12 columns), 450 × 225 (6 columns), 450 × 187.5 (5 columns), 450 × 150 (4 rows), 450 × 112.5 (3 rows), 450 × 75 (2 rows), and the like.

As the LED element 13, Nichia NSSW100C is applied as an example, and the light emission angle (so-called view angle) is about 60 degrees to about 120 degrees. Further, the LED element 13 is as thin as possible and preferably has a planar round shape or a square shape (casing shape).
In the embodiment shown in FIG. 3, in the single-sided double-sided light emitter 1, the vertical and horizontal intervals of the LED elements 13 are about 37.5 mm (450 mm ÷ 12). It can be appropriately changed within a range of ˜60 mm. Furthermore, when mounting the LED element 13 on the substrate 11 on which the electric wiring 12 is formed, a fixing method (joining method) by soldering or an adhesive can be employed.
Incidentally, since the LED elements 13 may be slightly different in color depending on the production lot even in the same color, it is preferable to use the LED elements 13 in the same lot as the plurality of LED elements 13 used in the same double-sided light emitter 1. Reference numeral 16 shown in FIG. 3 is a constant current circuit.

Next, the top film 14 will be described. For example, as shown in FIG. 1, the top film 14 covers the substrate 11 on which the LED elements 13 are mounted in a laminate shape, and mainly improves the waterproofness of the double-sided light emitter 1. Take on the purpose. Needless to say, in addition to such a purpose, the top film 14 also serves to protect and strengthen the LED element 13 (double-sided light emitter 1) from external force and sunlight.
In this embodiment, a pair of LED elements 13 are provided on both sides of the substrate 11 so as to sandwich the substrate 11, so that the top film 14 is also stretched on both sides of the front and back surfaces of the substrate 11. .

As the top film 14, a transparent plastic sheet having excellent permeability is mainly applied, and the material is high in mechanical strength and excellent in weather resistance (water resistance, heat resistance, light resistance, etc.). In addition, those having good processability are preferable, and examples thereof include polystyrene, polyester, vinyl chloride, and ABS. In particular, it is preferable to use a high-adhesion high-stretch PVC film (100 microns made by Hiroshima Kasei as an example), and this strong-adhesion high-stretch PVC film has no pinholes in the material, which improves waterproofness. It is thought that it contributes greatly to
Furthermore, when the top film 14 is stretched on the substrate 11 (LED element 13), the film is stuck in close contact with the unevenness of the LED element 13, so that air does not enter between the LED element 13 and the top film 14. This specific method will be described later.

Hereinafter, other members used for the double-sided light emitter 1 will be described.
Since the above-described double-sided light emitter 1 is flexible (bendable or foldable), the substrate 11 may be low in rigidity to be incorporated in the internally illuminated signboard SB or the like as it is. For this reason, as shown in FIG. 2, for example, a reinforcing plate 17 having a thickness of about 0.5 mm can be attached to the double-sided light emitter 1 (for example, made of aluminum). Here, reference numeral 17 a in the figure is an opening for avoiding interference with the LED element 13 when the reinforcing plate 17 is bonded (bonded) to the substrate 11.
Incidentally, although the reinforcing plate 17 is drawn in a flat state in FIG. 2 described above, the holding posture of the substrate 11 (double-sided light emitter 1) is not necessarily limited to the flat state. By forming it in a shape, the substrate 11 (double-sided light emitter 1) can also be held in the same posture as the reinforcing plate 17. That is, in terms of a signboard, not only a signboard with a flat display surface, but also an internally illuminated signboard SB with curved display surfaces on both sides as appropriate, for example, can be obtained.

The double-sided light emitter 1 has the basic structure as described above, and the characteristic items when the double-sided light emitter 1 is manufactured will be described below.
(1) Adhesive bonding of top film In this embodiment, the top film 14 is stretched in close contact with the concavo-convex shape of the LED element 13 mounted on the substrate 11 (both the front surface and the back surface). ). Specifically, the LED element 13 and the top film 14 are placed in a vacuum state and the film is stretched (vacuum pressure bonding). To perform such vacuum pressure bonding, as shown in FIG. A vacuum pressure bonding device 4 is applied. In addition, this FIG. 4 has shown the construction condition of the vacuum pressure bonding clearly, and the scale of the board | substrate 11 with which the top film 14 is stretched, the LED element 13, etc., and the vacuum pressure bonding apparatus 4 is not the same. Further, in this specification, “stretching (top film 14) in close contact” means sticking so that air does not enter between LED element 13 and top film 14. Hereinafter, the vacuum pressure bonding device 4 will be described.

The vacuum pressure bonding apparatus 4 shown in FIG. 4 is a kind of so-called “Next Generation Forming (NGF)”, and is provided with a set of boxes that can be sealed up and down. Here, the upper box is 41A, the lower box is 41B, the upper box 41A is opened at the lower side, and the lower box 41B is opened at the upper side, and the upper and lower boxes 41A and 41B are brought into contact with each other. When this occurs, the inside becomes a sealed space across the top film 14 to be stretched. Here, the sealed spaces formed in each box are 41AR and 41BR, respectively.
The upper box 41A is formed such that the box itself can move up and down, and an electric heater 42 is built in the box. Furthermore, although the lower box 41B is formed in an immobile state, an elevating table 43 that can move up and down is provided therein. In the figure, reference numeral 44 is a pressurized air tank, reference numeral 45 is a vacuum tank, and reference numeral 46 is a switching valve.
Hereinafter, an operation mode in which the top film 14 is stretched in close contact with the front surface of the substrate 11 by the vacuum pressure bonding device 4 will be described.

[1] Preparatory work The following preparatory work is carried out prior to the actual film tensioning work. First, as shown in FIG. 4 (a), the substrate 11 (which is referred to as an intermediate product 1a) with the LED elements 13 attached on both sides is mounted on the lifting table 43 in the lower box 41B in the separated and open state. (Set with the back surface of the substrate 11 facing down).
Here, in order to stably place the intermediate product 1a on the lifting table 43, it is preferable to use a jig 47 having substantially the same height as the LED element 13 as shown in FIG. The jig 47 can also act so that the top film 14 does not go around the non-tensioned surface (the non-processed surface on which the film is not stretched, and here the lower surface of the intermediate product 1a corresponds) (see FIG. 4 (d)). Of course, it is also possible to stably place the intermediate product 1a by forming a concave portion on the lifting table 43 to accommodate the LED element 13 with the back surface facing downward.
Next, the upper side of the lower box 41B is set so as to be covered with the top film 14 held by the frame F.

[2] Heating (vacuum)
Thereafter, as shown in FIG. 4B, the upper box 41A is lowered and the top film 14 is sandwiched between the upper and lower boxes 41A and 41B. In this state, independent sealed spaces 41AR and 41BR are formed in the upper and lower boxes 41A and 41B with the top film 14 interposed therebetween. Further, after the switching valve 46 is operated so that the vacuum tank 45 also acts on the sealed space 41AR, both the sealed spaces 41AR and 41BR are simultaneously brought into a vacuum state.
Then, after both the sealed spaces 41AR and 41BR reach a certain degree of vacuum, the electric heater 42 in the upper box 41A is operated to heat the top film 14.

[3] Primary molding When the top film 14 reaches a desired molding temperature by heating (a temperature at which the elongation rate of the film reaches the maximum is desirable), as shown in FIG. 4C, the lifting table in the lower box 41B. 43 is raised to perform primary molding. In this primary molding, the top film 14 is attached to the upper surface of the front LED element 13 which is the highest position (top surface) of the intermediate product 1a as shown in the figure.

[4] Secondary molding Next, the vacuum is released only inside the upper box 41A (sealed space 41AR). For this purpose, as shown in FIG. 4D, the switching valve 46 is operated to switch the sealed space 41AR to an open state, and then the atmosphere is introduced into the upper box 41A in the atmospheric pressure state. To. At this time, since the space in the lower box 41B, that is, the space below the top film 14 where the intermediate product 1a exists is still in a vacuum state, the upper and lower sides of the top film 14 are changed by the atmospheric pressure introduced into the upper box 41A. The top film 14 is pressed against the intermediate product 1a due to the pressure difference formed on the substrate 11 and securely adheres to the joint portion or corner portion of the substrate 11 and the LED element 13.

  As described above, in this embodiment, the film is stretched by setting the space between the top film 14 and the intermediate product 1a, that is, the space on the intermediate product 1a side pressed by the top film 14 as a vacuum. Therefore, air does not enter between the film and the LED element 13. Moreover, since the top film 14 is heated at the time of tensioning, the film stretches well and wrinkles do not occur, and the top film 14 can be brought into close contact with the uneven shape of the LED element 13. Moreover, since there is no air intrusion between the film and the LED element 13, the LED element 13 is not easily affected by heat from the outside during use of the finished product. In other words, if air has entered between the film and the LED element 13, the air trapped by the heat of the LED element 13 or the like expands during use of the finished product, and the LED element 13. However, in this embodiment, there is no concern about this in order to prevent air from entering.

  When the front side of the substrate 11 (intermediate product 1a) has been stretched, the intermediate product 1a is set in the opposite direction, and the top film 14 is stretched on the other back side. The mode is the same as the situation described above (not described).

(2) Applying a strong adhesive highly stretchable PVC film as the top film Further, in this embodiment, it is preferable to apply a highly adhesive highly stretchable PVC film (100 microns made by Hiroshima Kasei as an example) to the top film 14. In combination with the vacuum pressure bonding method, the top film 14 can be brought into almost complete contact with the uneven shape of the LED element 13. That is, since the top film 14 is a thick film and has excellent stretchability, the top film 14 is suitable for the vacuum pressure bonding in which the film is applied at a high elongation rate, and is sufficient for the uneven shape of the LED element 13. It can be made to adhere to.

  Moreover, since the said strong adhesion highly stretchable PVC film does not have a pinhole in a raw material, it is thought that this has contributed greatly to waterproofness improvement. That is, since there is no pinhole in the film, water penetration (permeation) from the outer surface to the LED element 13 side can be prevented at a high level after stretching, and this is considered to significantly improve waterproofness. . Incidentally, in a test conducted by the present applicant, it was confirmed that water immersion was not seen even after 4 months after the double-sided light emitting body 1 with the above-mentioned film stretched, and high waterproofness was exhibited. . For this reason, the double-sided illuminant 1 is not housed in the signboard case 2 or the like, and can be installed as it is (exposed state) outdoors or in places where water is splashed (for example, bathroom walls). In addition, a wide range of applications is possible, and a wide variety of variations of the double-sided light emitter 1 can be developed.

  The top film 14 (strongly adhesive highly stretchable polyvinyl chloride film) obtained the waterproof standard “IP58” defined by the JIS standard and the IEC standard (IEC stands for International Electrotechnical Commission and indicates the International Electrotechnical Commission). Is. “5” of “IP58” means “grade 5” of the first characteristic number, and indicates a protection grade for solid matter, that is, a so-called “dustproof” protection grade. By the way, this “5th grade” means that “dust that causes harmful effects does not enter (dust-proof type)”. In addition, “8” of “IP58” means “8th grade” of the second characteristic number, and indicates a protection degree against water. As for the resistance level against water, 0 to 8 grades are defined. If the grade is up to 6th grade, there is a possibility of inundation inside, and the 8th grade shows the highest level of “waterproof”. By the way, “waterproof grade 8” means that “even if it is continuously submerged, it will not be submerged inside (underwater type)”.

(3) Mesh-like electric wiring Furthermore, in this embodiment, even if a part of the electric wiring 12 is cut, the LED elements 13 remaining around the cut (free cut) defective portion FC are left behind. It is preferable to form a circuit through which a current flows (this is referred to as a “network circuit” in this specification) (see FIGS. 5 to 7). Thereby, for example, even if the double-sided light emitter 1 is partially cut in accordance with the shape of the signboard (the shape you want to shine), all of the remaining LED elements 13 can be lit and blinked, and extremely high workability and convenience. You can gain sex. Of course, the defective portion FC cut in the electric wiring 12 is not necessarily the outer edge (outer side) of the double-sided light emitter 1, but for example, a donut-shaped signboard, that is, a signboard cut out without emitting light in the middle. If so, the central portion of the double-sided light emitter 1 (1 unit) may be cut.

Moreover, in the electrical wiring 12, it is desirable that all the remaining LED elements 13 are lit (flashed) to the same brightness regardless of where the defective portion FC is formed (opened). For example, a method (individual control method) is considered in which a control body is provided in advance for each LED element 13 (a pair of LED elements 13), and thereby the current flowing into each LED element 13 is controlled almost uniformly.
On the other hand, for such individual control, for example, a ballast for controlling the current flowing into the LED element 13 is provided in front of the current inflow point of the mesh circuit, and the mesh circuit is partially cut. In this case, a method of collectively controlling the current flowing into each LED element 13 with this ballast is also conceivable.

Next, an internally illuminated signboard SB in which such a double-sided light emitter 1 is incorporated as a light source (light emitter unit) will be described. Here, as described above, the paired LED elements 13 are mounted so that the light emitting surfaces face the front and back surfaces of the substrate 11 (signboard), and therefore, the internally illuminated signboard SB is also visible from both the front and back surfaces or the left and right surfaces. It becomes a so-called double-sided advertising sign. However, since the double-sided light emitter 1 (with the LED element 13 provided as described above) is applied here, the thickness of the signboard is extremely different from a double-sided advertisement-type signboard using a normal fluorescent light source. It can be thinly formed and can also cope with the size of the signboard (the size of the desired advertisement display). Incidentally, as one of the double-sided advertisement type signs, for example, as shown in FIG. 1, there is a sleeve signboard (a protruding sign) attached in a protruding state from a wall surface of a building or the like.
For this reason, the internally illuminated signboard SB according to the present invention is provided in the signboard case 2 including the display surface 21 (both the front side and the back side) serving as the advertisement surface and the frame body 22 that holds the display surface 21. In addition, the double-sided light emitter 1 is installed.

  The display surface 21 is preferably a fiber sheet (FF sheet) or acrylic in which both sides of a member made of strong fiber are sandwiched (integratedly formed) with a translucent resin layer. In addition, when the vertical and horizontal intervals of the LED elements 13 are about 37.5 mm as described above and the view angle is about 105 degrees to 110 degrees, if the display surface 21 is an FF sheet, the LED elements 13 The distance from the display surface 21 to the display surface 21 is about 50 mm, the diverging light from the LED element 13 becomes uniform, and it has been confirmed by the present applicant that the dots of the LED element 13 are not visually observed (does not appear). It can be said that production of a thin internally illuminated signboard SB (double-sided advertising type thin electrical decoration) of about 100 mm is possible. If the display surface 21 has an acrylic thickness of about 5 mm (other conditions are the same as described above), the internally illuminated signboard SB can be further reduced to a size of about 80 mm.

  Further, as described above, the double-sided light emitter 1 of the present invention is not necessarily housed and used in the signboard case 2 but can be installed in an exposed state as it is or outdoors. In this case, rather than lighting (flashing) all the LED elements 13 all at once, the LED elements are turned on (flashing) partially to form appropriate characters, symbols, marks, pictures, etc. It seems to be common to turn on and blink 13. Incidentally, the reason why the double-sided light emitter 1 can be used in an exposed state is that the top film 14 is pasted on both sides of the double-sided light emitter 1 and is excellent in waterproofness, weather resistance and the like. In other words, when the top film 14 is not stretched, it is used outdoors in a signboard case 2 having high waterproofness, or in a space (indoor) where there is no risk of water (water vapor) intrusion. The usage environment is limited.

In the case where the substrate 11 is flexible, the double-sided light emitter 1 of the present invention can be used as a signboard (display board) whose display surface 21 is curved (or bent) as shown in FIG. 8, for example. . In FIG. 8, the exposed double-sided light-emitting body 1 is simply held by the frame member FR, and the display (advertisement display / information display) assumes the case where an arrow is displayed as an LED (both front and back surfaces). ). By the way, in the conventional double-sided advertisement-type internally illuminated signboard using a fluorescent lamp as the light source, there are directions and parts that become blind spots (invisible parts) due to the thickness of the side part, but double-sided light emission like this figure Since the body 1 is thin, it is effective in that there is no such blind spot. In addition, by providing the above signboards (display boards) on both sides (both sides) of the store entrance, not only the “two arrows” display can be seen from various directions, but these “two arrows” enter the viewer. Since it can give the impression of inviting the store, it can be expected to have an effect of attracting people's eyes sufficiently, and it can be an interesting signboard.
Of course, the double-sided light-emitting body 1 of the present invention can be used for applications other than signboards (particularly internally illuminated signboards SB) because it has double-sided light emission and is excellent in waterproofness. It is possible to incorporate them in part or to form them entirely with the double-sided light emitter 1. Furthermore, it can be used as an evacuation guidance line or a handrail guidance, both indoors and outdoors.

[Other Examples]
The present invention has the above-described embodiment as one basic technical idea, but the following modifications can be considered. First, in the basic embodiment described above, the pair of LED elements 13 are mounted directly on both sides of the substrate 11 (so as to sandwich the substrate 11), but the mounting method of the LED elements 13 is not necessarily in this form. It is not limited to. That is, as a mounting method other than the above, for example, as shown in FIG. 9, first, a bridge-shaped bracket 18 having a substantially U shape is formed by a conductive metal, and both sides of the central plane portion of the bracket 18 are formed. After mounting the pair of LED elements 13 on the substrate 11, a mounting method is possible in which this (the bracket 18 provided with the pair of LED elements 13) is provided on the substrate 11. In this case, the bracket 18 serves as an electrode for energizing the pair of LED elements 13 and also serves as a heat sink.

At this time, in the electric wiring 12 on the substrate 11, the light transmittance of the portion facing the LED element 13 (light emitting surface) (the portion through which the light from the LED element 13 transmits) is not reduced as much as possible (light emission). It is preferable not to form the electrical wiring 12 so as not to hinder. That is, in the basic embodiment described above, the electrical wiring 12 is formed in a single line shape, but in the embodiment shown in FIG. 9, it is preferable that the electrical wiring 12 is formed intermittently. is there. Of course, in the case where it takes time and labor to process the electrical wiring 12 intermittently on processing or equipment, by partially opening the substrate 11 facing the LED element 13 (light emitting surface), It is also possible to remove the electric wiring 12 in this portion.
Incidentally, as an advantage of the present embodiment, since a pair of LED elements 13 are provided in advance on the bracket 18, the LED element 13 is mounted on the substrate 11 simply by attaching the bracket 18 to the substrate 11 at the stage of manufacturing the double-sided light emitter 1. 11 can be mounted in a facing state. That is, the manufacturer that manufactures the double-sided light emitter 1 usually purchases the LED element 13 itself. Therefore, if the manufacturer that manufactures the LED element 13 can particularly install the LED element 13 on the bracket 18 (manufacturing is possible). If it is easy, a manufacturer that manufactures the double-sided light emitter 1 does not need to form the slits 15 in the substrate 11 and can efficiently manufacture the double-sided light emitter 1 itself.

Further, the mounting method shown in FIG. 10 is an embodiment in which a bracket 18 on which a pair of LED elements 13 are opposed is formed in a straight shape. In this case, the LED element 13 is provided on the substrate 11 (LED An opening 19 (to avoid contact with the element 13) is formed. In the case of this embodiment, when a non-conductive material is applied as the bracket 18 (for example, glass epoxy resin is assumed to be used for heat dissipation), the bracket 18 is intended to be joined to the substrate 11. In addition, the electric wiring 12a is formed. Of course, in order to energize the pair of LED elements 13 provided to the bracket 18 at the same time, a slit is formed in the bracket 18 (electrical wiring 12a) (similar to the slit 15), and energization can be achieved. Is possible.
In addition, in this embodiment, in particular, when the manufacturer of the LED element 13 can manufacture the LED element 13 in such a configuration (when the manufacture is easy), the manufacturer of the double-sided light emitter 1 This is effective in that the manufacturing of products can be performed efficiently.

  The double-sided light emitter 1 of the present invention is used as an indoor / outdoor advertisement display board / information display board in an exposed state not accommodated in the signboard case 2, that is, the double-sided light emitter 1 alone, in addition to the double-sided advertisement type internally illuminated signboard SB. be able to. Moreover, since it is a double-sided light emission (double-sided illumination), it can also be utilized as a window decoration etc. which served as a partition, a partition, or the interior / exterior of a store. Furthermore, since the board | substrate 11 is flexible, the surface which installs the double-sided light-emitting body 1 is not necessarily limited to a flat state, It can install in the bent surface and the appropriate R curved surface, Therefore For example, it can also be installed on curved glass.

DESCRIPTION OF SYMBOLS 1 Double-sided light-emitting body 1a Intermediate product 2 Signboard case 4 Vacuum pressure bonding apparatus 11 Board | substrate 12 Electric wiring (printed wiring)
12a Electrical wiring 13 LED element 14 Top film 15 Slit 16 Constant current circuit 17 Reinforcing plate 17a Opening 18 Bracket 19 Opening 21 Display surface 22 Frame 41A Upper box 41AR Sealed space 41B Lower box 41BR Sealed space 42 Electric heater 43 Lifting Table 44 Pressure tank 45 Vacuum tank 46 Switching valve 47 Jig 100 Reflector 110 Mounting plate 120 Illumination unit FC Defect part FR Frame member SB

Claims (5)

A substrate with electrical wiring;
In a surface light emitter comprising a plurality of LED elements arranged substantially regularly with respect to the substrate,
The electrical wiring is formed only on one surface of the substrate,
The double-sided light emitter is characterized in that the LED element provided on the substrate is mounted in a facing state so that the light emitting surface faces both sides of the substrate.
The substrate is one to which a flexible material that can be bent or bent is applied,
The double-sided light emitting body according to claim 1, wherein a top film is provided so as to cover the LED element from above.
The pair of LED elements are provided so as to sandwich a substrate,
2. The substrate according to claim 1, wherein a slit is formed in a portion where the electric wiring is formed on the substrate, and the LED element provided on the non-electric wiring side is made conductive with the electric wiring by the slit. Or the double-sided light-emitting body of 2.
The pair of LED elements are provided in a conductive state so that the bracket is sandwiched with respect to a bracket formed separately from the substrate.
3. The double-sided light emitting body according to claim 1, wherein the LED element is mounted on the substrate by mounting the bracket on the substrate to mount the LED element.
  In an internally illuminated signboard in which a double-sided light emitter is incorporated in a signboard case comprising a display surface viewed from both front and back sides of the signboard and a frame body that holds the display surface, the double-sided light emitter 5. A double-sided advertising type internally illuminated signboard characterized by applying the double-sided light emitter according to claim 1, 2, 3, or 4.

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