JP2010122494A - Double-sided sign - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided sign which is easily produced without increase of construction man-hours and a material cost resulting from the use of many light sources, also, without damaging the structure strength thereof, and with less unevenness in illuminance on both surfaces thereof. <P>SOLUTION: The internal illumination type double-sided sign 10 includes: both surface materials 18 and 19 having diffuse transmission performance; light reflectors 20 and 21 each formed in a projecting shape in cross section, having diffuse reflection performance; and one or more light emitting elements 17 having a viewing angle of ≥90°; wherein each light emitting element is arranged in a position separated from the apex of the projecting part of the light reflector in a state where the light emitting surface of the element faces the apex. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a double-sided sign (Sign) whose both surfaces are illuminated from the inside, and more specifically, using a point light source such as an LED (Light Emitting Diode) as a light emitting element, The present invention relates to a double-sided sign that can be suitably used for internally illuminated signs, lighting fixtures, light boxes, and the like.

  Conventionally, light sources for double-sided signs such as bank signboards (generally vertical double-sided signs protruding outward from the outer wall of the building where the bank is located), convenience store pole signs, double-sided road signs, etc. A tubular fluorescent lamp is generally used (see, for example, Patent Document 1).

  In contrast, in recent years, the life of a 40 W straight tube fluorescent lamp is 12,000 hours, whereas the life of an LED light source is as long as 50,000 hours, and recently the light efficiency of LEDs has increased. Accordingly, the number of double-sided signs using LEDs as light sources has been increasing from the prediction that it will catch up with the light efficiency of fluorescent lamps in the near future and will exceed it.

  However, the viewing angle of a general chip-type LED is 110 ° to 120 °, and when the chip-type LED is arranged on one side of the substrate, it can illuminate only in one direction. Therefore, when making a double-sided signature using LED as a light source, two light emitting members with LEDs arranged on one side of the substrate are overlapped back to back, and the illumination surfaces of both light emitting members are directed to both surface materials, Both light-emitting members had to be installed inside the double-sided sign. The same applies to the case of using a light-emitting member in which four-chip LEDs or the like modularized on a board are arranged in a matrix to simplify the construction on the signboard.

  However, the construction method as described above increases the quantity of LEDs, which not only requires man-hours for LED placement and wiring, but also increases the material cost, which increases the price of double-sided signatures. Moreover, since the double-sided sign is often installed outside the building without being along the wall of the building, a structural member for withstanding strong winds such as a typhoon is installed inside. However, it is difficult to give structural strength to a double-sided sign using the above-described light emitting member. Therefore, in the construction method as described above, a double-sided sign having sufficient strength like the double-sided sign of a conventional fluorescent light source. It was difficult to make.

  Also, using a plastic light guide plate kneaded with a diffusing agent and plastic beads, the light emitting surface of the LED is arranged on the edge of this light guide plate toward the light guide plate side, and the edge portion of the light guide plate including the LED is a light reflecting plate There is a method to radiate light to both sides by the edge light method wrapped in. However, it is difficult to give structural strength to a double-sided sign using the light guide plate described above, and it is impossible to use the edge light type light guide plate as a light source for an existing signboard of a conventional design.

JP 2004-13072 A

  The present invention has been made in view of the above-described circumstances, and can be easily manufactured without increasing the number of man-hours and material costs by using a large number of light sources and without impairing the structural strength of the double-sided sign. An object of the present invention is to provide a double-sided sign that can be produced with little unevenness in illuminance on both surfaces. We also provide a double-sided sign that can be used to remove the fluorescent light source and renew it to an LED light source while keeping the current double-sided sign of the conventional fluorescent lamp light source almost unchanged and with less uneven illumination on both surfaces. The purpose is to do.

  As a result of intensive studies to achieve the above object, the present inventors have arranged a light reflecting plate having a convex cross section having diffuse reflection performance inside the double-sided sign, and the convex portions of the light reflecting plate are arranged. When one or a plurality of light-emitting elements that are diffused and emitted at a viewing angle of 90 ° or more and are located at a distance from the top of the top and have a specific high luminous flux emit light toward the top of the convex portion of the light reflector , Light diffused from the light emitting element at the time of light emission, light reflected and diffused by a light reflecting plate having a convex cross section, light reflected by both surface materials of a double-sided sign and light reflected on each side of a double-sided sign on both surfaces It was found that a double-sided sign with little illuminance unevenness was obtained.

This invention is made | formed based on the knowledge mentioned above, and provides the double-sided signature shown to following (1)-(14).
(1) Both surface materials having diffuse transmission performance, a light reflecting plate having a convex cross section having diffuse reflection performance, and a light emitting element having a viewing angle of 90 ° or more,
An internally illuminated double-sided sign characterized in that the light emitting element is disposed at a position away from the top of the convex portion of the light reflecting plate with the light emitting surface facing the top.
(2) Both surface materials have diffusion transmission performance, and both surface materials to be internally lit are rectangular or square double-sided signatures, one parallel to at least two opposing side surfaces of the double-sided signatures The light reflecting plate having a convex cross section having the above diffuse reflection performance is arranged with the top of the convex portion facing the side surface, and one or a plurality of light emitting elements having a viewing angle of 90 ° or more are reflected by the light. A double-sided sign, wherein the light emitting surface is disposed at a position away from the top of the convex portion of the plate with the light emitting surface facing the top.
(3) The double-sided signature according to (1) or (2), wherein the light reflection plate has a cross section of a mountain or a trapezoid.
(4) The double-sided signature according to (1) or (2), wherein the light reflecting plate has a semicircular cross section.
(5) The light reflecting plate has two convex portions, the two convex portions are integrally formed so as to face each other, and the light emitting element is located away from the top of the two convex portions. (2) The double-sided signatures according to (1) to (4), wherein the light-emitting surfaces are arranged on the tops.
(6) The double-sided sign according to (5), wherein the light reflecting plate has a rhombus or turtle shell shape in cross section.
(7) The double-sided sign according to (5), wherein the light reflecting plate has a circular cross section.
(8) The double-sided sign according to (3) or (6), wherein an angle on the top side formed by the slope of the light reflecting plate is 60 ° or more and 120 ° or less.
(9) The double-sided sign according to (1) to (8), wherein the light emitting element is an LED module having an LED mounted on a substrate, a heat radiating means such as a heat sink, and a waterproof means more than a drip proof.
(10) The double-sided signature of (9), wherein the LED module has a luminous flux per module of 200 lm or more.
(11) The LED module has a simple fixing magnet using anisotropic ferrite on the back surface, has a magnet holding force of 1 kg or more on the iron plate, and can be attached to a side surface of a double-sided sign or an internal structural member. The double-sided signature of (9) or (10).
(12) The double-sided sign of (9) to (11), wherein the LED module has a connector and can be wired between the LED modules and between the LED module and the power source with a cable with an arbitrary length.
(13) The double-sided sign of (1) to (12), wherein the light reflecting plate having a convex cross section has a light diffuse reflectance of visible light of 80% or more.
(14) The light reflecting plate having a convex cross section is made of a thermoplastic resin film or sheet comprising fine bubbles or pores having an average bubble diameter of not less than the wavelength of light and not more than 50 μm inside (1) to (13). Double-sided sign.

  In the double-sided sign according to the present invention, a light reflecting plate having a convex cross section having diffuse reflection performance is disposed, and a light emitting element is disposed at a position away from the top of the convex portion of the light reflecting plate, and a light emitting surface is directed to the top. When the light emitting element emits light, the light diffused from the light emitting element at the time of light emission, the light reflected and diffused by the light diffusing light reflecting plate having a convex cross section, the light reflected by both surface materials, Light spreads on both surfaces due to light reflected from the side surface, etc., and there is an effect that illuminance unevenness is small. In addition, the double-sided sign according to the present invention removes the fluorescent light source while keeping the current double-sided sign of the conventional fluorescent light source almost as it is, and also keeps the illuminance unevenness on both surfaces small. There is an effect that the point light source can be renewed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.

  First, the double-sided sign has a frame made of four metal side surfaces that are open in a rectangular or square shape on both the front side and the back side, and the central part of the lower side and the upper side of the frame are used as structural members. An example of the solution according to the present invention will be described in the case where the metal square pipes are connected and the frame is connected and reinforced in the shape of a stick with the metal square pipe.

  In the above solution, a foam sheet having a visible light diffuse reflectance of 80% or more (manufactured by Furukawa Electric Co., Ltd., trade name: MCPET (registered trademark), thickness 1 mm, diffuse reflectance so as to surround the structural member. 96%) is disposed such that one diagonal is perpendicular to both surface materials. In this case, the light reflection plate is installed so that the angle formed by the extended line of the rhombus slope and the extended line of the side surface of the double-sided sign is 30 ° to 60 °. As the light source, one or a plurality of LED modules having a viewing angle of 110 ° and a luminous flux of 250 lm having an anisotropic ferrite fixing magnet on the back surface, and a fixing magnet when the left and right sides of the double-sided sign are made of iron And fixed to the inner surface of the side surface of the double-sided sign by magnetic force. The pitch of the LED module is determined in consideration of the distance to the top of the light reflection plate facing the light emitting point of the LED module, the distance between the front and back surface materials, and the required illuminance on the double-sided sign surface. The present invention can be carried out by closing the opening portions on both surface sides of the frame with a non-combustible sheet for an interior lighting signboard surface material made of glass fiber and heat-resistant resin, a milky white diffusing transparent acrylic plate, or the like. . If a foam sheet with a visible light diffuse reflectance of 80% or more is installed inside the upper and lower side surfaces of the double-sided sign in a flat plate shape or a cross-sectional chevron shape, it will further improve the illuminance on both surfaces and reduce uneven illuminance desirable.

  The solution described above has a light reflecting plate having a convex cross section with a light diffuse reflectance of 80% or more and a longitudinal length parallel to the left and right side surfaces substantially equal to the inner dimension length of the double-sided sign. One or a plurality of LED modules with a viewing angle of 90 ° or more arranged at a position away from the top of the convex portion with the light emitting surface facing the top of the convex portion of the light reflecting plate emit light. Diffused light, light diffused by a diffused light reflecting plate with a convex cross section, light reflected by both surface materials, light reflected by each side surface, etc., the light spreads to both surfaces to obtain a double-sided sign with little illuminance unevenness be able to.

  In the present invention, the bottom of the light reflecting plate having a convex cross section is combined to form a rhombic cross section, and the light reflecting plate having the cross section rhombus is connected in parallel with the left and right side surfaces of the sign so as to connect the central portions of the upper and lower side surfaces. In this case, the LED module can be arranged on the inner side of both side surfaces facing away from the top of the light reflecting plate with the light emitting surface facing the light reflecting plate side. When the light reflector is placed on the side of the double-sided sign with the top of the convex part facing the inside, the LED module is placed near the center of the sign with the light-emitting surface facing the top of the convex part of the light reflector. It can be fixed to a manufactured iron structural member with a magnet. When the side surfaces of the structural member and the sign are not made of iron, they can be mechanically fixed with screws or the like. By providing a flat or cross-sectional light reflector with a diffuse reflectance of 80% or more on the upper and lower side surfaces of the double-sided sign, it is possible to make a double-sided sign with even less illuminance unevenness.

  By providing a simple fixing magnet using anisotropic ferrite on the back surface of the LED module, the LED module can be easily mounted on the iron side member or the reinforcing structural member inside the double-sided sign. In addition, when the LED module has a connector and can be wired between the LED modules and between the LED module and the power source with a cable with an arbitrary length, the LED module can be easily and has a reinforcing structure inside the double-sided sign. It can be constructed while avoiding the members well. Furthermore, if the light reflecting plate having a diffuse reflectance of 80% or more is a plastic foam sheet, not only greatly contributes to eliminating uneven illumination on both surfaces, but also to avoid the structural member for reinforcement in the double-sided sign during construction. It is possible to easily construct a part of the reflector by cutting and deleting a part of the reflector so that the reflection effect is not significantly lost.

  FIG. 1 is a perspective view showing an embodiment of a double-sided signature according to the present invention. In FIG. 1, reference numeral 10 denotes a double-sided signature of the present invention. In the double-sided sign 10, a frame having both sides opened by a left side surface 11, a right side surface 12, an upper side surface 13, and a lower side surface 14 is assembled, and strength reinforcement is made by a first structural member 15 and a second structural member 16. . The first structural member 15 is surrounded by a light reflecting plate 20 having a mountain-shaped cross section and a light reflecting plate 21 having a mountain-shaped cross section, and the light reflecting plates 20, 21 reflect the light in a rhombus shape with diagonal lines in the left-right direction and the front-rear direction. A plate is formed. The light reflecting plate 20 and the light reflecting plate 21 are housed with notches so that they can be housed while avoiding the second structural member 16.

  The LED module 17 of the light source has a luminous flux of 200 lm or more, a viewing angle of 90 ° or more, water resistance of drip-proof or more, a heat sink, a connector for connection, and a fixing magnet on the side opposite to the light emitting surface. The mounting positions of the LED module 17 are the inside of the left side surface 11 and the inside of the right side surface 12, the light emitting surface is directed to the top of the peak portion of the light reflecting plates 20, 21 having a cross-sectional mountain shape, and one or a plurality of each is provided on each side surface. Was fixed with a magnet. If the side material is not iron, the LED module is fixed with screws or the like.

  In the double-sided sign 10 of this example, the opened front surface side and back surface side are closed with a front surface material 18 and a back surface material 19 having diffuse transmission performance.

  In the double-sided sign 10 of the present example, the material of the left and right, upper and lower side members may be any material as long as it has strength and has weather resistance and flame retardancy or incombustibility. An aluminum plate is used. As the first structural material 15 and the second structural material 16, plates, pipes, wires, irregular shapes, etc. made of iron, aluminum, alloy, etc. are used for securing strength and reinforcement. .

  If the light reflecting plates 20 and 21 having a convex reflection section having diffuse reflection performance have a light diffusion reflectance of 80% or more, for example, a coated metal plate, a plastic plate coated or kneaded with a reflective agent, or a plastic foam sheet Alternatively, any of a film, a plastic foam sheet or a metal plate, a glass plate, a plastic fiber board, etc., on which the film is bonded, may be used, but the plastic foam sheet is light and self-supporting, and is most preferable. The foamed sheet can be used without particular limitation as long as it is a foamed sheet having a diffuse reflectance of 80% or more, but is preferably a thermoplastic polyester or cyclopolyolefin having fine bubbles or pores having an average cell diameter of 50 μm or less inside. A foam sheet made of More specifically, as an example of the above-mentioned sheet, a polyester-based foam having an internal cell diameter of 50 μm or less, which is a sheet obtained by impregnating an extruded sheet of thermoplastic polyester with carbon dioxide gas under high pressure and then heating and foaming the sheet. A sheet (for example, MCPET (registered trademark) manufactured by Furukawa Electric Co., Ltd.) can be used. In addition, similarly, a cyclopolyolefin foamed sheet having an internal cell diameter of 50 μm or less can be used.

  Examples of the convex shape of the cross section of the light reflectors 20 and 21 include a triangle (mountain shape), a semicircular shape, a semi-elliptical shape, a trapezoidal shape, a semi-polygonal shape, and a polygonal trapezoid shape. A shape or trapezoid is preferred. If the convex rising portion is not more than 10 mm inside from the surface material, the image of the light reflection plate can be seen through the surface material. The angle formed between the hypotenuse and the hypotenuse of the mountain or trapezoid is preferably 60 ° to 120 °, and preferably 80 ° to 100 °. That is, when the surface material of the double-sided sign is rectangular or square, the angle formed between the hypotenuse of the mountain or trapezoid and the side of the double-sided sign is preferably 30 ° to 60 °, and preferably 40 ° to 50 °.

  A light emitting element having a specific light beam that diffuses and emits light at a viewing angle of 90 ° or more is an LED module 17 in which an LED is mounted on a substrate, has a heat radiating means such as a heat sink, and has a waterproof means more than drip-proof. This LED module desirably has a luminous flux of 200 lm or more, has a simple fixing magnet using anisotropic ferrite on the back surface, and desirably has a magnet holding force of 1 kg or more on the iron plate. If the side material is not iron, the LED module is attached to the side of the double-sided sign with screws or the like. Moreover, this LED module has a connector, and it is desirable to be able to wire between LED modules and between an LED module and a power supply with arbitrary length with a cable.

  The surface materials 18 and 19 are a milky white translucent acrylic plate, a milky white translucent polycarbonate plate, and a vinyl chloride FF sheet (Sekisui Chemical Co., Ltd., trade name: sign sheet, product variation: T-02). PVC)), a non-combustible sheet for a surface material for an illuminated signboard made of glass fiber and a heat-resistant resin, a glass cloth, and the like can be appropriately selected according to use.

  In the present invention, the diffuse reflectance of visible light refers to the ratio of the diffuse reflectance flux to the incident flux, measured at a wavelength of 550 nm by a self-recording spectrophotometer, and the diffuse reflectance of a white plate obtained by solidifying fine powder of barium sulfate is 100. %, And the value obtained as the relative value. As the self-recording spectrophotometer, for example, UV-3100PC (manufactured by Shimadzu Corporation, trade name) can be used.

  In the present embodiment, the light reflecting plates 20 and 21 having two convex portions are disposed in the central portion of the double-sided sign 10, and the LEDs 17 are provided on the left and right side surfaces 11 and 12 of the double-sided sign 10. Although light is emitted toward the tops of the convex portions of the reflectors 20 and 21, respectively, the configuration is not limited to this. For example, as shown in FIG. 2, two light reflecting plates 56 having a mountain-shaped cross section are provided so as to sandwich a square pipe-shaped central first structural member 56 provided in the central portion of the double-sided sign 50, and Light reflecting plates 61 and 63 having a mountain-shaped cross section are provided on the left and right side surfaces 51 and 52, with the tops facing inward, and the left first structure disposed between the central first structural member 56 and the side surfaces 51 and 52. The LEDs 58 may be arranged on both surfaces of the member 55 and the right first structural member 57 so as to emit light toward the tops of the convex portions of the reflectors 51, 62, 63, respectively. Further, the central first structural member 56 may be omitted, and a light reflecting plate in which two convex portions are formed integrally with each other may be provided in place of the light reflecting plate 62. In this case, the light reflection plate may have a diamond shape, a turtle shell shape, or a circular cross section. In the case of a diamond shape or a turtle shell shape, it is preferable that the angle on the top side formed by the slope of the light reflector is 60 ° or more and 120 ° or less.

  Hereinafter, the present invention will be described specifically by way of examples. In addition, this invention is not limited by these.

[Example 1]
FIG. 1 shows a double-sided signature of Example 1. The double-sided sign 10 of this example was produced as follows. A frame having a length of 600 mm, a width of 600 mm, and a thickness of 300 mm was produced from an iron plate having a thickness of 1 mm. The center of the upper side surface 13 and the center of the lower side surface 14 are connected to each other by a steel square pipe having a thickness of 0.5 mm, a cross-section of 10 mm in the left-right direction, and a depth direction of 30 mm. The first structural member 15 was welded to the upper and lower side surfaces. Also, the left and right side surfaces 11 and 12 of the double-sided sign are connected to the left and right side surfaces of the double-sided sign by connecting the left and right sides of the double-sided sign to the left and right sides of the double-sided sign by connecting 50 mm from the center in the width direction to a cylindrical bar with a diameter of 5 mm Member 16 was obtained. Light reflectors (made by Furukawa Electric Co., Ltd., trade name MCPET, diffuse reflectance: 96%, bent product with a thickness of 1 mm) 20 and 21 were arranged so as to surround the first structural member. The light reflecting plates 20 and 21 have a mountain-shaped cross section with a side of 75 mm, and one diagonal line is arranged so as to be perpendicular to both surface materials 18 and 19. Further, the front surface and the back surface material 19 made of a milky white acrylic plate (Mitsubishi Rayon Co., Ltd., trade name: Acrylite, product number: 432) having a thickness of 5 mm are closed on the front surface and back surface of the frame, A double-sided signature 10 was used. As the LED module 17, the product number NS6W083B of an outdoor signboard LED module manufactured by Nichia Corporation was used. The mounting positions of the LED modules are the inner surfaces of the left and right sides of the double-sided sign, and a total of six LED modules are attached to each LED module at three locations of 100 mm, 300 mm, and 500 mm from the top in the center in the width direction. Fixed by. The LED module has a light flux of about 250 lm, a viewing angle of 110 °, water resistance that is more than drip-proof, and has a heat sink and a connector for connection.

  Next, illuminance measurement was performed on one side of the obtained double-sided sign. The reason for measuring the illuminance on only one side is that both sides are manufactured under the same conditions. The measurement position was 10 mm, 150 mm, 300 mm, 450 mm, and 590 mm in the horizontal direction from the position of 200 mm from the top of the vertical direction on the left side of the surface, and the light receiving part of the illuminometer was directly in contact with the surface of each position. . Similarly, the illuminance at positions of 10 mm, 150 mm, 300 mm, 450 mm, and 590 mm in the horizontal direction from the position of 300 mm from the top was measured. Symbols were set to easily represent the measurement position on the surface where the measurement was performed. The position 10 mm right from the upper left end of the surface is X1, the position 150 mm right is X2, the position 300 mm right is X3, the position 450 mm right is X4, and the position 590 mm right is X5. Regarding the symbols in the vertical direction, 200 mm from the top is Y1, and 300 mm is Y2. The symbols representing the measurement positions simply are the same in Examples 1 to 4 and Comparative Examples 1 to 4. As the illuminance meter, a general AA illuminance meter (model name 50002) manufactured by Yokogawa M & C Co., Ltd. was used. The measurement results were as follows.

  In Example 1, a light reflecting plate having a convex cross section toward the LED and having a diffuse reflectance of 80% or more is used. For this reason, the vertical column of X3 = 300 (the center of the double-sided sign) is almost the same and slightly brighter than the surrounding X2 = 150 or X4 = 450, and no difference in illuminance is visually confirmed. Therefore, the effect of the present invention is realized.

  The central part of the double-sided sign cannot be visually discerned when the illumination is equal or slightly higher than the surroundings, but it becomes very dark and conspicuous when it becomes somewhat dark, and it becomes a defective product as a double-sided sign. Comparative Example 1 described later Is an example. In this example, the peripheral part of X1 = 10 and X5 = 590 is the part corresponding to the thickness of the LED module and the direct light of the LED does not come, and the illuminance is obtained by the reflected light inside, so the measurement result Thus, it is darker than X2 = 150 and X4 = 450. However, since the periphery of X1 = 10 and X5 = 590 is brighter than the outside of the double-sided sign, such a decrease in illuminance is generally not a concern and is allowed.

[Example 2]
The same as in Example 1 except that the non-combustible sheet for the interior lighting signboard surface material (manufactured by Sumitomo 3M Limited, trade name: Panagraphics, product number: 745NF) was used as the front surface material 18 and the back surface material 19. Thus, a double-sided sign 10 was produced.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  In Example 2, a light reflecting plate having a convex cross section toward the LED and having a diffuse reflectance of 80% or more is used. For this reason, the vertical column of X3 = 300 (the center of the double-sided sign) is almost the same and slightly brighter than the surrounding X2 = 150 or X4 = 450, and no difference in illuminance is visually confirmed. Therefore, the effect of the present invention is realized.

  The central part of the double-sided sign cannot be visually discerned when the illumination is equal or slightly higher than the surroundings, but it becomes very dark and conspicuous when it becomes somewhat dark, and it becomes a defective product as a double-sided sign. Comparative Example 2 described later Is an example. In this example, the peripheral part of X1 = 10 and X5 = 590 is the part corresponding to the thickness of the LED module and the direct light of the LED does not come, and the illuminance is obtained by the reflected light inside, so the measurement result Thus, it is darker than X2 = 150 or X4 = 450. However, since the periphery of X1 = 10 and X5 = 590 is brighter than the outside of the double-sided sign, such a decrease in illuminance is generally not a concern and is allowed.

  The difference between Example 2 and Example 1 is that Example 2 uses a non-combustible sheet for an internally illuminated signboard surface material as a surface material. The difference between Example 1 using an acrylic plate as a surface material and Example 2 using an incombustible sheet for an internally illuminated signboard surface material is that the incombustible sheet for an internally illuminated signboard surface material is more peripheral than the acrylic plate. The illuminance at the portion where X1 = 10 and X5 = 590 is improved, and the variation of the overall illuminance is reduced.

[Example 3]
In the double-sided signature of Example 1, a flat plate-like light reflecting plate (made by Furukawa Electric Co., Ltd., trade name: MCPET, diffuse reflectance: 96) over the entire surface on the left, right, and upper and lower side surfaces. %) Was set as Example 3.

  In Example 1, the LED modules are already attached to the left and right side surfaces by magnets. In Example 3, the positional relationship between the light reflection plate installed on the side surface and the LED module is first on the side surface. After installing the light reflecting plate, the LED module was attached to the side surface with a magnet from above to form Example 3. The front surface material and the back surface material are the same milky white acrylic plates as in Example 1.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  In Example 3, a light reflecting plate having a convex cross section toward the LED and having a diffuse reflectance of 80% or more is used, and a light reflecting plate having a light diffuse reflectance of 80% or more is formed on almost the entire inner surfaces of the left, right, and upper and lower side surfaces. Is installed. For this reason, the vertical column of X3 = 300 (the center of the double-sided sign) is almost the same and slightly brighter than the surrounding X2 = 150 or X4 = 450, and no difference in illuminance is visually confirmed. Therefore, the effect of the present invention is realized.

  The central part of the double-sided sign cannot be visually discerned when the illumination is equivalent or slightly higher than the surroundings, but it becomes very dark and conspicuous when it becomes somewhat dark, and it becomes a defective product as a double-sided sign. Comparative Example 3 described later Is an example. In this example, the peripheral part of X1 = 10 and X5 = 590 is the part corresponding to the thickness of the LED module and the direct light of the LED does not come, and the illuminance is obtained by the reflected light inside, so the measurement result Thus, it is darker than X2 = 150 or X4 = 450. However, since the peripheral portion of X1 = 10 and X = 590 is brighter than the outside of the double-sided sign, such a decrease in illuminance is generally not concerned and allowed. Moreover, since Example 3 uses a light reflecting plate having a diffuse reflectance of 80% or more on the inner surface of the side surface, the overall illuminance is increased by about 21% compared to Example 1.

[Example 4]
In the double-sided sign of Example 2, a flat light reflecting plate (made by Furukawa Electric Co., Ltd., trade name: MCPET, diffuse reflectance: 96) having a light diffuse reflectance of 80% or more on the entire surface on the left, right, upper and lower side surfaces. %) Was set as Example 4.

  In Example 2, the LED modules are already attached to the left and right side surfaces by magnets. In Example 4, the positional relationship between the light reflection plate installed on the side surface and the LED module is first on the side surface. After installing the light reflection plate, the LED module was attached to the side surface with a magnet from above to form Example 4. The front-side surface material and the back-side surface material are the same non-combustible sheets for internally illuminated signboard surface materials as in Example 2.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  In Example 4, a light reflecting plate having a convex shape in section toward the LED and having a diffuse reflectance of 80% or more is used. Further, a light reflecting plate having a light diffuse reflectance of 80% or more on almost the entire inner surfaces of the left and right and upper and lower side surfaces. Is installed. For this reason, the vertical column of X3 = 300 (the center of the double-sided sign) is almost the same and slightly brighter than the surrounding X2 = 150 or X4 = 450, and no difference in illuminance is visually confirmed. Therefore, the effect of the present invention is realized.

  The central portion of the double-sided sign cannot be visually discerned when the illumination is equal to or slightly higher than the surroundings, but it becomes very dark and conspicuous when it becomes somewhat dark, and it becomes a defective product as a double-sided signature. Comparative Example 4 described later Is an example. In this example, the peripheral part of X1 = 10 and X5 = 590 is the part corresponding to the thickness of the LED module and the direct light of the LED does not come, and the illuminance is obtained by the reflected light inside, so the measurement result Thus, it is darker than X2 = 150 or X4 = 450. However, since the peripheral portion of X1 = 10 and X = 590 is brighter than the outside of the double-sided sign, such a decrease in illuminance is generally not concerned and allowed. Moreover, since Example 4 uses a light reflecting plate having a diffuse reflectance of 80% or more on the inner surface of the side surface, the overall illuminance is increased by about 30% compared to Example 2.

  The difference between Example 4 and Example 3 is that Example 4 uses a non-combustible sheet for an interior lighting signboard surface material as a surface material. The difference between Example 3 using an acrylic plate as a surface material and Example 4 using an incombustible sheet for an internally illuminated signboard surface material is that the incombustible sheet for an internally illuminated signboard surface material is closer to the peripheral portion X1 than the acrylic plate. = 10 and X5 = 590, the illuminance is improved, and the variation in overall illuminance is reduced.

[Example 5]
FIG. 2 shows a double-sided signature of Example 5. The double-sided sign 50 of this example was produced as follows. A frame having a length of 600 mm, a width of 1200 mm, and a thickness of 300 mm was produced from an iron plate having a thickness of 1 mm. The frame includes a left side 51, a right side 52, an upper side 53, and a lower side 54 of a double-sided sign. 300 mm, 600 mm, 900 mm depth direction center from the left of the upper side surface 53 and 300 mm, 600 mm, 900 mm depth direction center from the left side of the lower side surface 54, the thickness is 0.5 mm, the cross section is 10 mm in the left-right direction, depth A square steel pipe with a direction of 30 mm is connected to a stick-shaped bar, and the upper and lower sides of the square pipe are welded to the upper and lower sides of a double-sided sign to form a left first structural member 55, a central first structural member 56, and a right first structural member 57. .

  Inside the left side surface 51 and the right side surface 52, a mountain with a cross-sectional mountain shape made of a foam sheet (Furukawa Electric Co., Ltd., trade name: MCPET, thickness: 1 mm, diffuse reflectance: 96%) having a diffuse reflectance of 80% or more The light reflectors 61 and 63 having a height of 130 mm, a base length of 260 mm, and an apex angle of 90 ° are arranged on the left and right side surfaces. The length of the light reflector is approximately equal to the side length of the double-sided sign. A light reflecting plate 62 having a rhombus cross section with one side of a cross section of 75 mm was disposed so as to surround the central first structural member so that the diagonal line is in the left-right direction and the front-rear direction. The rise of the peak of the angled light reflector as viewed from the front side is from the part entering 20 mm inside from the surface of the double-sided sign. In addition, a flat light reflector (made by Furukawa Electric Co., Ltd., trade name: MCPET, thickness 1 mm) having a diffuse reflectance of 80% or more is installed on almost the entire inner surface of the upper side 53 and the lower side 54. did. Furthermore, the opening part of the surface side and the back surface side was obstruct | occluded with the incombustible sheet for internal lighting signboard surface materials (the Sumitomo 3M Co., Ltd. brand name: Panagraphics, product number: 745NF), and it was set as the double-sided sign 50.

  As the light-emitting element, product number NS6W083B of an outdoor signboard LED module manufactured by Nichia Corporation was used. The mounting positions of the LED module 58 are the left and right surfaces of the left first structural member 55 and the right first structural member 57, respectively, and a total of 12 LEDs are placed at three locations of 100 mm, 300 mm, and 500 mm from the top in the center in the width direction. The module was fixed by a magnet attached to each LED module. The LED module has a light flux of about 250 lm, a viewing angle of 110 °, water resistance that is more than drip-proof, and has a heat sink and a connector for connection.

  The LED of the double-sided sign in this example was turned on, and illuminance unevenness was confirmed visually. There was no dark portion at the center, and the effect of the present invention was obtained.

[Comparative Example 1]
FIG. 3 shows a double-sided signature of Comparative Example 1. The double-sided sign 70 of this example was produced in the same manner as the double-sided sign 10 of Example 1 except that no light reflector was installed. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  In Comparative Example 1, a light reflecting plate having a convex cross section toward the LED and having a diffuse reflectance of 80% or more is not used. For this reason, the vertical column of X3 = 300 (the center of the double-sided signature) is 16% darker than the surrounding X2 = 150 or X4 = 450. The central part of the double-sided sign cannot be visually discerned when the illuminance is slightly higher than the surroundings. However, if it is slightly dark, it becomes very dark and conspicuous, resulting in a defective double-sided sign.

[Comparative Example 2]
The same as in Comparative Example 1 except that the front side surface material 18 and the back side surface material 19 were non-combustible sheets for internal lighting signboard surface materials (manufactured by Sumitomo 3M, trade name: Panagraphics, product number: 745NF). Thus, a double-sided sign 70 was produced.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  In Comparative Example 2, a light reflecting plate having a convex cross section toward the LED and a diffuse reflectance of 80% or more is not used. For this reason, the vertical column of X3 = 300 (the center of the double-sided signature) is about 12% darker than the surrounding X2 = 150 or X4 = 450. The central part of the double-sided sign cannot be discriminated with the naked eye when the illuminance is slightly higher than the surroundings, but it becomes very dark and conspicuous when it becomes somewhat dark, and it becomes a defective product as a double-sided sign.

[Comparative Example 3]
In the double-sided signature of Comparative Example 1, a flat light reflecting plate (made by Furukawa Electric Co., Ltd., trade name: MCPET, diffuse reflectance: 96) on the entire surface on the left and right and upper and lower side surfaces is 80% or more. %) Was set as Comparative Example 3.

  As for Comparative Example 1, the LED modules are already attached to the left and right side surfaces by magnets. In Comparative Example 3, the positional relationship between the light reflection plate installed on the side surface and the LED module is first on the side surface. After installing the light reflecting plate, the LED module was attached to the side surface with a magnet from above to form Comparative Example 3. The front surface material and the back surface material are the same milky acrylic plates as in Comparative Example 1.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  Comparative Example 3 is different from Comparative Example 1 in that light reflecting plates having a diffuse reflectance of 80% or more are used on the upper and lower and left and right side surfaces of the double-sided signature of Comparative Example 1. However, in Comparative Example 3, a light reflecting plate having a convex cross section toward the LED and having a diffuse reflectance of 80% or more is not used. For this reason, the vertical column of X3 = 300 (the center of the double-sided signature) is 16% darker than the surrounding X2 = 150 or X4 = 450. The central part of the double-sided sign cannot be visually discerned when the illuminance is slightly higher than the surroundings, but if it becomes slightly dark, it becomes very dark and conspicuous, resulting in a defective double-sided sign. In Comparative Example 3, since a light reflecting plate having a diffuse reflectance of 80% or more is used on the inner surface of the side surface, the overall illuminance is increased by about 25% compared to Comparative Example 1.

[Comparative Example 4]
In the double-sided sign of Comparative Example 2, a flat plate-like light reflecting plate (made by Furukawa Electric Co., Ltd., trade name: MCPET, diffuse reflectance: 96) on the entire surface on the left, right, and upper and lower side surfaces is 80% or more. %) Was set as Comparative Example 4.

  In Comparative Example 2, the LED modules are already attached to the left and right side surfaces by magnets. In Comparative Example 4, the positional relationship between the light reflection plate installed on the side surface and the LED module is first on the side surface. After installing the light reflection plate, the LED module was attached to the side surface with a magnet from above to obtain Comparative Example 4. The front-side surface material and the back-side surface material are the same non-combustible sheets for internally illuminated signboard surface materials as in Comparative Example 2.

  Next, in the same manner as in Example 1, illuminance measurement was performed on one side of the obtained double-sided sign. The measurement results were as follows.

  Comparative Example 4 is different from Comparative Example 2 in that light reflecting plates having a diffuse reflectance of 80% or more are used on the upper and lower and left and right side surfaces of the double-sided signature of Comparative Example 2. However, in Comparative Example 4, a light reflecting plate having a convex cross section toward the LED and having a diffuse reflectance of 80% or more is not used. For this reason, the vertical column of X3 = 300 (the center of the double-sided sign) is darker by about 8% than the surrounding X2 = 150 and X4 = 450. The central part of the double-sided sign cannot be discriminated with the naked eye when the illuminance is slightly higher than the surroundings, but it becomes very dark and conspicuous when it becomes somewhat dark, and it becomes a defective product as a double-sided sign. In Comparative Example 4, since a light reflecting plate having a diffuse reflectance of 80% or more is used on the inner surface of the side surface, the overall illuminance is increased by about 37% compared to Comparative Example 2.

It is a perspective view which shows one Embodiment of the double-sided signature which concerns on this invention. It is a perspective view which shows one Embodiment of the double-sided signature which concerns on this invention. It is a perspective view which shows the double-sided signature of the comparative example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Double-sided sign 11 of this invention Left side surface 12 Right side surface 13 Upper side surface 14 Lower side surface 15 1st structural member 16 2nd structural member 17 LED module 18 Front side surface material 19 Back side surface material 20 Light-reflecting board 21 of convex cross section Convex light reflector 50 Double-sided sign 51 of the present invention Left side surface 52 Right side surface 53 Upper side surface 54 Lower side surface 55 Left first structural member 56 Central first structural member 57 Right first structural member 58 LED module 59 Front surface material 60 Back-side surface material 61 Convex light reflecting plate 62 Convex light reflecting plate 63 Convex light reflecting plate 70 Double-sided signature of comparative example

Claims (14)

Both surface materials having diffuse transmission performance, a light reflecting plate having a convex cross section having diffuse reflection performance, and a light emitting element having a viewing angle of 90 ° or more,
An internally illuminated double-sided sign characterized in that the light emitting element is disposed at a position away from the top of the convex portion of the light reflecting plate with the light emitting surface facing the top.   Both surface materials have diffuse transmission performance, and both surface materials to be internally illuminated are rectangular or square double-sided signatures, and one or more diffusions in parallel with at least two opposing side surfaces of the four side surfaces of the double-sided signatures A light reflecting plate having a convex section with reflecting performance is arranged with the top of the convex portion facing the side surface, and one or a plurality of light emitting elements having a viewing angle of 90 ° or more are formed on the convex portion of the light reflecting plate. A double-sided sign, wherein the light-emitting surface is disposed at a position away from the top of the part with the light emitting surface facing the top.   The double-sided sign according to claim 1, wherein the light reflecting plate has a mountain shape or a trapezoidal cross section.   The double-sided sign according to claim 1, wherein the light reflecting plate has a semicircular cross section.   The light reflecting plate has two convex portions, and the two convex portions are integrally formed so as to face each other, and the light emitting element is located at a position away from the top of the two convex portions. The double-sided sign according to any one of claims 1 to 4, wherein the double-sided sign is arranged with a light emitting surface facing the top.   The double-sided sign according to claim 5, wherein the light reflecting plate has a rhombus shape or a turtle shell shape in cross section.   The double-sided sign according to claim 5, wherein the light reflecting plate has a circular cross section.   The double-sided sign according to claim 3 or 6, wherein the angle on the top side formed by the slope of the light reflecting plate is 60 ° or more and 120 ° or less.   The double-sided sign according to any one of claims 1 to 8, wherein the light emitting element is an LED module in which an LED is mounted on a substrate, and includes a heat radiating means such as a heat sink and a waterproof means that is drip-proof or higher. .   The double-sided sign according to claim 9, wherein the LED module has a luminous flux per module of 200 lm or more.   The LED module has a simple fixing magnet using anisotropic ferrite on the back surface, has a magnet holding force of 1 kg or more on an iron plate, and can be attached to a side surface of a double-sided sign or an internal structural member. Or the double-sided signature of 10.   The double-sided signature according to any one of claims 9 to 11, wherein the LED module has a connector, and can be wired between the LED modules and between the LED module and the power source with a cable with an arbitrary length.   The double-sided sign according to any one of claims 1 to 12, wherein the light reflecting plate having a convex cross section has a light diffuse reflectance of visible light of 80% or more.   14. The light reflecting plate having a convex cross section is made of a thermoplastic resin film or sheet comprising fine bubbles or pores having an average bubble diameter of not less than the wavelength of light and not more than 50 [mu] m inside. Double-sided sign as described in

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