JP3137498U - Linear light source and electric signboard using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear structure having a structure in which a seam is hardly noticeable and can be made as long as possible even when it is used as a light source of a thin and long electric signboard, using a semiconductor light emitting element that has a long life and can save power. Provided is a light source and an electric signboard using the linear light source.
A side wall (13) facing a side wall (12) (13) on the inner surface side of a side wall (12, 13) adjacent to the opening (11) of a cylindrical body (1) having a substantially square cross section and having an opening (11) formed on one side. 12) A semiconductor light emitting element (LED) 2 is provided so as to emit light to the side. The LEDs 2 are arranged at regular intervals d in the longitudinal direction of the cylindrical body 1 and are formed so as to emit light from the opening 11.
[Selection] Figure 1

Description

  The present invention relates to a linear light source that can be used, for example, for a light source of an elongated electric signboard or lighting of a display shelf. More specifically, while arraying point-shaped semiconductor light-emitting elements, it is possible to achieve almost uniform brightness in the length direction, and no matter how long it is made, the seam is not noticeable, and it generates less heat and is suitable for energy saving. The present invention relates to a linear light source and an electric signboard using the linear light source.

  For example, an electric signboard illuminates and displays an image drawn on a display panel by irradiating the display panel with light from a planar light source. As such a planar light source, as a simple configuration, a straight tube of a fluorescent lamp (hereinafter referred to as a fluorescent tube) is arranged at an appropriate interval, or a fluorescent tube is sandwiched between a transmitted light adjusting sheet and a light reflecting sheet. Even if the distance between the planar light source and the display panel is small, the transmitted light adjustment sheet has a small light transmission area near the fluorescent tube and a large light transmission area far from the fluorescent tube. A planar light source, a semiconductor light emitting element (hereinafter also referred to as LED) arranged in a plane at regular intervals, or light from a fluorescent tube or LED is introduced from the side wall of the light guide plate to be uniform from the surface of the light guide plate A structure that irradiates light is considered.

For example, a planar light source using a transmitted light adjusting sheet has a configuration as shown in FIG. 10 (see, for example, Patent Document 1). That is, in FIG. 10, a transmitted light adjusting sheet 61 and a light reflecting sheet 62 are bonded to each other at both ends by an adhesive tape 63 or the like, and a linear light source 64 such as a fluorescent tube is disposed at the center. It has become. The transmitted light adjusting sheet 61 is formed such that the light transmitting region 61a has a small area near the linear light source 64 and increases as the distance from the linear light source 64 increases, and the other region is a light reflecting surface 61b. As a result, the light is uniformly emitted from the surface of the transmitted light adjustment sheet 61 in the plane while being repeatedly reflected in the space between the light reflection surface 61b of the transmitted light adjustment sheet 61 and the light reflection sheet 62. ing.
JP 2003-123526 A

  As described above, a fluorescent tube is generally used as a light source of a conventional electric signboard, and in the case of an LED, it is arranged in a plane facing the display panel or guided from the side of the light guide plate. Only a structure in which the light of the LED is incident on the light plate, reflected on the bottom surface of the light guide plate, and emitted uniformly from the surface is considered. That is, by using the transmitted light adjusting sheet as shown in FIG. 10 using the LED, the light emitted by the power saving by the LED is used without being attenuated when entering the light guide plate, etc. No specific configuration has been proposed that can reduce the distance between the light source and the display panel.

  On the other hand, when the above-mentioned fluorescent tube is used, the power consumption is larger than that of the LED, and low power consumption is required from the viewpoint of the current global warming countermeasures, and the life of the fluorescent tube is limited. It has the problem of being expensive. Furthermore, if it is a wide electric signboard with a length of one fluorescent tube, it is only necessary to arrange a number of fluorescent tubes, and if it is a long electric signboard arranged side by side, it is adjacent. It is possible to make the joints of the fluorescent tubes darker by arranging the fluorescent tubes to be shifted, but the width can be as small as one fluorescent tube. However, there is a problem that the illuminance at the joint portion of the fluorescent tube is lowered and the dark portion of the display is noticeable.

  Furthermore, when arranging LEDs or the like in a planar shape, for example, if LEDs of about 100 mW are arranged at an interval of about 50 mm, the in-plane luminance must be increased unless the distance between the LED arrangement surface and the display panel is about 6 to 7 cm. Therefore, in order to reduce the distance, the LED array interval must be narrowed to about 25 mm or less, resulting in an increase in power consumption. Furthermore, in the configuration in which the light of the LED is introduced from the side surface of the light guide plate, the LEDs are arranged outside the light guide plate. Therefore, when a large number of planar light sources are arranged side by side or an elongated linear light source is used, There is a problem that a dead space is formed, and it is impossible to obtain a uniform luminance in the portion of the dead space, and cost and weight are increased.

  The present invention has been made to solve such problems, and even when a light source for a thin and long electric signboard is used while using a semiconductor light emitting element that has a long life and can save power, the joint is An object of the present invention is to provide a linear light source having a structure that is hardly noticeable and can be made as long as possible, and an electric decoration signboard using the linear light source.

  Another object of the present invention is to use a blue or ultraviolet light emitting element chip for the LED, while using an inexpensive white LED that is white light by coating with a resin (phosphor) containing a luminescent color conversion substance. Another object of the present invention is to provide a linear light source that emits light that has a color rendering property close to natural light, or that stimulates the purchase of products irradiated with the color of irradiated light, such as seafood and fruits that have a reddish taste. .

  A linear light source according to the present invention includes a cylindrical body having a substantially square cross section and an opening formed along a longitudinal direction on one surface, and a longitudinal length of the cylindrical body adjacent to the opening of the cylindrical body. A semiconductor light emitting element provided on at least one side of the pair of side walls extending in the direction so as to emit light to the side wall opposite to the side wall, wherein the semiconductor light emitting element has a constant interval in the longitudinal direction of the cylindrical body Arranged so as to emit light from the opening.

  Here, the linear light source means a light source having a sufficiently narrow width with respect to the length, and does not mean that the thickness (width) is extremely thin. For example, a light source having a width or diameter of about 15 cm or less is long. If the length is 60 cm or more, it corresponds to a linear light source. Moreover, the substantially quadrangular cross section means a cross sectional shape of a main portion (for example, a portion where an LED is provided) as a light source, and includes a portion having a protruding portion or a decorative shape portion on the outer shape and a portion different from the square shape. Meaning.

  The semiconductor light-emitting elements are provided on opposite sides of the side wall, and the semiconductor light-emitting elements provided on both sides of the opposite side wall are arranged along the longitudinal direction of the cylindrical body so as not to face each other in front of each other. It is preferable that they are provided in a staggered manner because the effective use of light is enhanced and the uniformity of light is improved along the longitudinal direction of the cylindrical body.

  The semiconductor light emitting element is provided on both sides of the side wall facing each other, and the semiconductor light emitting element is also provided on the bottom side facing the opening of the cylindrical body, the semiconductor light emitting element being in the longitudinal direction of the cylindrical body It is preferable that the light beams are arranged at regular intervals because the light travels in various directions and the intensity of the light can be increased.

  The semiconductor light emitting element is provided on both sides of the side wall facing each other, provided with a hole for transmitting light from the semiconductor light emitting element, and provided with a light reflecting sheet having a W-shaped cross section and a low central peak. The structure is preferable because light can be efficiently emitted from the opening of the cylindrical body.

  When a semiconductor light emitting element is also provided on the bottom surface of the cylindrical body, a hole for transmitting light from the semiconductor light emitting element is provided, and a cross-sectional shape is formed in a trapezoidal shape having a W shape and a low peak at the center. With the structure provided with the light reflecting sheet, the light from the semiconductor light emitting element can be efficiently emitted from the opening of the cylindrical body.

  A Fresnel lens for diffusing the light emitted from the semiconductor light emitting element in the longitudinal direction of the cylindrical body is provided on the surface side of the semiconductor light emitting element, and the luminance is made uniform along the longitudinal direction. It is preferable to make the luminance uniform along the longitudinal direction.

  Another embodiment of the linear light source according to the present invention has a substantially rectangular cross section, a cylindrical body having an opening along the longitudinal direction on one surface, an inner surface formed on a light reflecting surface, and a side surface on the outer side. The planar light source comprises a planar light source provided with semiconductor light emitting elements at the corners of the bottom surface of the inclined tray-shaped box and configured to emit light almost uniformly from the opening surface of the tray-shaped box. Are arranged along the longitudinal direction of the cylindrical body on the bottom surface side facing the opening of the cylindrical body, so that uniform light is emitted from the opening formed on one surface of the cylindrical body. It has a structure to do.

  By providing a light diffusing plate having a light diffusing action at the opening of the cylindrical body constituting each of the linear light sources described above, the light emitted from the linear light source becomes non-directional, and thus more uniform. Easy to use as a luminance light source.

  70% or more of the semiconductor light emitting element provided along the longitudinal direction of the cylindrical body or the semiconductor light emitting element of the planar light source is coated with a light emitting color conversion substance on the surface of a light emitting element chip that emits blue or ultraviolet light. Therefore, it is formed so as to emit white light, and the remaining 10 to 30% is a red and / or green semiconductor light emitting element. While using a white LED, the light source can be made closer to natural light.

  Here, the red color includes light of a color close to red, such as orange, in addition to red, and the green color means a color close to yellow other than green.

  The cylindrical body may have a structure in which at least one side wall has an outer shape protruding outward through a tapered portion. With such a shape, even when this linear light source is used as it is as an illumination device for a display shelf as it is, it can be used without an uncomfortable feeling on the viewer side.

  An electrical signboard according to the present invention is a vertically long box-shaped cross section, a housing having an opening surface on at least one surface corresponding to the long side of the rectangular shape, and the rectangular short side of the housing A linear light source provided on at least one inner surface side of the side wall corresponding to the side of the side wall facing the side wall so that the emitted light is directed to the side of the side wall, and provided on the opening surface. A transmitted light adjusting sheet on which a light reflecting film having a large number of light transmitting regions is formed so as to be radiated from the opening surface substantially uniformly along the width direction of the surface, and provided on the surface side of the transmitted light adjusting sheet The linear light source of any one of Claims 1 thru | or 10 is used for the said linear light source.

  Here, the substantially rectangular cross-section means that the cross-sectional shape of the main part of the display panel is a rectangular shape, and includes the shape of the outer wall being rounded or decoratively deformed. It is.

  According to the linear light source of the present invention, semiconductor light emitting devices (LEDs) are arranged in a thin cylindrical body, and light is reflected and emitted from one surface of the cylindrical body. From the opening of the cylindrical body, light is emitted as substantially uniform light over the entire range of the opening. Moreover, no matter how much the length of the cylindrical body is added, the distance between the LEDs can be arranged uniformly, and no dead space is generated in the added portion, and a linear light source with uniform brightness can be obtained no matter how long. Can do. In this case, as an LED, it is inexpensive to use an LED that turns white light by applying a resin containing a light-emitting color conversion material that converts light into blue on the surface of an LED chip that emits light such as blue or ultraviolet light. However, since it lacks color rendering properties, the color of the product may be dull, especially as a light source for a display shelf that illuminates a product such as fruit or seafood, which may reduce the willingness to purchase. In the case of such an application, since a large number of LEDs are arranged in the above-described cylindrical body, a part (about 30% or less) of red LEDs (including a color close to red) or green LEDs are used. (Meaning to include colors close to green) By replacing with LEDs, such problems can be eliminated, and there is no need to make white light with the three primary colors of red, green, and blue, and manufacturing at low cost. Can do.

  In addition, according to the electric signboard of the present invention, the linear light source that can be made as long as the above is arranged on the side wall side of the housing and radiated to the opposite side wall side, and transmitted through the opening surface perpendicular to the side wall. A light adjustment sheet is provided, and the light emitted from the linear light source is reflected in the housing, and is uniform from the surface of the transmitted light adjustment sheet in the opposite side wall direction, that is, in the direction perpendicular to the longitudinal direction of the linear light source. Since light is emitted, even in the case of an elongated electric signboard which is long in the longitudinal direction of the electric signboard, that is, the longitudinal direction of the linear light source, and has a relatively narrow width, that is, the longitudinal direction of the linear light source. Uniform light is radiated in both the vertical and vertical directions, making it possible to realize an electric signboard with an excellent appearance. As a result, for example, in the case of a convenience store, a supermarket, or the like, when a long and narrow advertising signboard is formed in a headband shape (horizontally) at the top of a storefront, it is also a vertically long place placed on the floor in a banquet hall or conference hall. Even when used as a guide signboard, a very beautiful electric signboard can be formed with a desired length. In addition, the width | variety of an elongate electrical decoration signboard can be formed in about 10 cm to 1 m by adjusting the brightness | luminance of a linear light source, and when making it a width | variety of about 40 cm or more, a linear light source is provided on the both sides of the side wall of a housing. A sufficiently bright electric signboard can be obtained by arranging.

  Next, a linear light source according to the present invention and an electric signboard using the linear light source will be described with reference to the drawings. The linear light source according to the present invention is shown in FIGS. 1A to 1C as a cross-sectional explanatory diagram of one embodiment thereof, a plane explanatory diagram in which a light diffusing plate and a light reflecting sheet are removed, and a plane in which the light reflecting sheet is developed. As shown in the explanatory diagrams, the side wall 12 (13) is formed on the inner surface side of the side walls 12 and 13 adjacent to the opening 11 of the tubular body 1 having a substantially square cross section and the opening 11 formed on one surface. A semiconductor light emitting element (LED) 2 is provided so as to emit light to the opposite side wall 13 (12) side. The LEDs 2 are arranged at a constant interval d in the longitudinal direction of the cylindrical body 1 as shown in FIG. 1B, and are formed so as to emit light from the openings 11. In the example shown in FIG. 1, the LED 2 is provided on both sides of the opposing side walls 12, 13, and covers the side walls 12, 13 side and the bottom surface 14 side, and the LED 2 part transmits through the light of the LED 2. (Refer to FIG. 1 (c)), the light-reflective sheet 3 having a W-shaped cross-sectional shape and a lower central peak is provided, but the LED 2 may be only on one side, which will be described later. As such, it may be further provided on the bottom surface 14 side of the tubular body 1. Furthermore, even if the light reflecting sheet 3 is not provided, it is only necessary that the inside of the cylindrical body 1 is formed on a good reflecting surface. In addition, the dotted line in FIG.1 (c) has shown the bending part made into W type | mold.

  The tubular body 1 is formed to have a thickness of about 1 mm by, for example, drawing aluminum or the like, and is formed to a length of 1 to 3 m, for example, about 1 m. By adding, you can form as long as you like. Further, the width W is formed to be 2 to 15 cm, for example, about 7 cm, and the thickness H is formed to about 1.5 to 2.5 cm, for example, about 2.35 cm. The length of the cylindrical body 1 is formed in accordance with the length of a linear light source required according to the length of an electric signboard, a display shelf used for lighting, and the width W is It is determined by the thickness of the signboard, the installation space, the size of the shelves. Although the thickness H is preferably as thin as possible, it is formed in the dimensions as described above from the size of the LED 2 and the like.

  For example, as shown in FIG. 2, the LED 2 has an LED chip 23 mounted on one of two leads 21, 22 formed by a lead frame, wire-bonded by a wire 24, and a periphery of which is molded resin 25. It is possible to use a chip type LED which is molded by the above process and has a lens 25a formed on the front surface. However, it is not limited to such a structure, it may be a structure without a lens on the front surface, or it may be a chip type light emitting device having a structure in which an LED chip is mounted on an insulating substrate and covered with a resin, and further a resin portion A dome-shaped lamp-type LED 2, a side-view type that emits light in a lateral direction, a bare chip that is chipped from a semiconductor wafer, or the like can also be used. When the dome-shaped LED 2 is used, an LED having a large directivity angle is preferred because the directivity is not reduced much. Moreover, as LED2, LED which coat | covered the light emission color conversion substance (fluorescent substance) which mixed the surface of the LED chip of blue or ultraviolet light with white light is used, and LED of R, G, B is used. Since white light can be obtained at a lower cost than mixing and incorporating, it is preferable. There is no problem with this white light source when used as a power source for an electric signboard, but when this linear light source is used as it is for illumination of a display shelf or the like, such white light has poor color rendering, When irradiating reddish fish or fruits, the product value may become dull and the product value may be reduced. In such a case, 10 to 30% of the LEDs 2 are arranged. It is preferable that the red LED and / or the green LED 2 be replaced and mixed.

  For example, as shown in FIG. 1, the LED 2 is connected to a power source by inserting leads 21 and 22 of the LED 2 into through holes of a wiring board 20 on which wiring is formed, and connecting them by soldering or the like. It has become. For this reason, the wiring board 21 is formed to have a length of, for example, about 285 mm, and is connected in series between, for example, six units each in series between 24 V power sources. For example, the LEDs 2 having an output of about 100 mW are arranged on the side walls 12 and 13 side of the cylindrical body 1 with an interval d of about 10 to 20 mm, whereby the luminance of the opening 11 becomes about 500 cd. Sufficient brightness can be obtained both for lighting and for electric signboards. In FIG. 1B, 28 indicates a switch for turning on / off the power supply to the LED 2, and 29 indicates a connector.

  In the example shown in FIG. 1, the LEDs 2 provided on the side walls 12 and 13 on both sides are provided so as to face each other. In the case where the LEDs 2 are also provided on the side of the bottom surface 14 to be described later, the three LEDs 2 may be provided so as to be shifted so as to have an equal pitch. By adopting such a structure, it becomes easy to achieve uniform luminance along the longitudinal direction of the cylindrical body 1.

  In the example shown in FIG. 1, a light reflecting sheet 3 is provided in a cylindrical body 1. The light reflecting sheet 3 is, for example, a light diffuse reflection made of a product name MCPET (ultrafine particle foamed light reflecting plate) manufactured by Furukawa Electric Co., Ltd. or a product name E60 (polyester foamed sheet having a thickness of about 180 μm) manufactured by Toray Industries, Inc. The member is affixed to an aluminum plate or the like, and the cross-sectional shape is W so that a cross-sectional view is shown in FIG. 1A and a part of the plan view of the light reflecting sheet 3 is shown in FIG. The central peak portion of the letter shape is lowered and formed in a shape that is covered with the reflection sheet 3 except for the opening 11 of the cylindrical body 1, and further, a through hole 31 is formed in the portion of the LED 2. Has been. As a result, the light is efficiently radiated from the opening 11 while being reflected in the space surrounded by the light reflection sheet 3 and the light diffusion plate 4 provided in the opening 11 of the tubular body 1, and the longitudinal direction of the tubular body 1. Reflected light easily travels in the direction, which is suitable for making the luminance in the longitudinal direction uniform. However, as described above, the light reflecting sheet 3 is not essential, and the light reflecting sheet 3 may be omitted when the inside of the cylindrical body 1 is formed with high reflectivity.

  The light diffusion plate 4 is provided in the opening 11 of the cylindrical body 1 so as to close the opening 11. The light diffusing plate 4 is made of, for example, acrylic resin (PMMA), polyethylene terephthalate (PET), polycarbonate, or the like having a thickness of about 3 mm, for example, and evenly emits light from an oblique direction in all directions on the surface. have. The light diffusing plate 4 makes the light from the LED 2 indirect light so that the intensity is not partially biased. For example, like the light source of an electric decoration signboard, the linear light source is directly applied. In the case where the display panel is irradiated through a transmitted light adjusting sheet or a light diffusing plate without irradiating the product or the like, it may not be necessary. Rather, it is preferable not to attenuate light excessively through the light diffusion plate 4. However, when used for lighting that directly illuminates a product such as a display shelf, it is preferable to provide such a light diffusing plate as indirect light from the viewpoint of preventing reflection of the light source. Further, a light diffusion sheet such as a thin vinyl sheet (FF sheet) or a milky white sheet may be used.

  In the example shown in FIG. 1 described above, the light reflecting sheet 3 is provided, and the LED 2 portion is covered with the light reflecting sheet 3 except for the portion that emits light. As long as the inside of the body 1 is formed so as to increase the reflection of light, the light reflection sheet 3 may be omitted. This example is shown in FIG. 3 by a cross-sectional explanatory view similar to FIG. Even in such a structure, if the light diffusing plate 4 is provided in the opening 11, reflection is repeated between the inside of the cylindrical body 1 and the light diffusing plate 4 to diffuse also in the longitudinal direction of the cylindrical body 1. Thus, light with uniform intensity can be extracted from the light diffusion plate 4 provided in the opening 11. Although not shown, a Fresnel lens that diffuses light in the longitudinal direction of the tubular body 1 is provided on the surface side of the LED 2, so that the Fresnel lens is arranged between the LEDs 2 arranged in the longitudinal direction of the tubular body 1. As a result, the light diffuses in the longitudinal direction, so that the luminance in the cylindrical longitudinal direction can be made uniform. That is, the Fresnel lens is a lens having ring-shaped irregularities formed on the surface, and the thickness direction is limited by the bottom surface 14 of the cylindrical body 1, but in the longitudinal direction, the Fresnel lens on the adjacent LED 2 Can be extended until connected.

  FIG. 4 is a cross-sectional explanatory view similar to FIG. 1 (a) showing still another embodiment of the linear light source of the present invention. This example is different in that the LED 2 is provided not only on the side walls 12 and 13 side of the cylindrical body 1 but also on the bottom surface 14 side facing the opening 11, and therefore, the light reflecting sheet 3 is The other configuration is the same as the configuration shown in FIG. 1 except that the cross-sectional shape is a trapezoidal portion at the center. With such a structure, the light intensity is further improved, and it can be made brighter for illumination, and when it is used as an electric signboard, even a wide electric signboard is sufficiently uniform. An illuminated signboard with brightness can be obtained.

  The example shown in FIG. 5 is an example in which the light reflecting sheet 3 is not provided and the LED 2 is also provided on the bottom surface 14 side of the cylindrical body 1, that is, a structure in which the light reflecting sheet 3 is removed in the structure of FIG. . Other structures are the same as those of the previous examples, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 6 is a diagram showing still another embodiment of the linear light source of the present invention. The example shown in FIG. 6 does not directly arrange the LEDs 2 in the longitudinal direction of the cylindrical body 1, but uses a small planar light source that emits uniform light from the opening surface of the box body 26 whose upper surface is open. By arranging the planar light sources side by side in the cylindrical body 1, uniform light can be emitted from the opening 11 of the cylindrical body 1, and an elongated linear light source is obtained. That is, for example, the LEDs 2 having various structures described above are formed at least at two opposite corners of the bottom surface of the tray-like box body 26 having a rectangular bottom surface, an open top surface, a light reflecting surface, and an inclined side wall 26a. The box 26 is provided so as to irradiate. Each LED 2 is provided so as to cover and irradiate a half space partitioned by a diagonal line inside the box 26, and the inner surface is formed as a light reflecting surface (covered with a light reflecting member). Therefore, the light is reflected from the side wall 26a and the bottom surface in the box 26, and light is emitted with uniform brightness from the opening surface side. In particular, if the LEDs 2 are provided at the four corners of the box 26, the irradiation area of one LED 2 covers 1/2 of the box 26, so that the light of at least two LEDs 2 is mixed. The In addition, two LEDs 2 can be arranged at each corner, and a light source can be obtained which is mixed with small output LEDs 2 to make the color uniform and bright.

  For example, the box 26 is formed in a square having a side A of the opening surface of about 40 mm, and the side B of the bottom surface is formed in a square of about 30 mm. The height C of the side wall 26a is about 15 mm. The inclination angle of the side wall 26a changes the uniformity of the luminance of the opening surface, and the inclination angle is set so that the luminance is uniform over the entire opening surface. Even if it is used for lighting of a display shelf or an electric signboard having a width of about 50 cm to 1 m, which will be described later (preferably a linear light source is placed on both sides), two LEDs 2 with an output of about 100 mW are provided at each corner of the four corners. By providing them one by one, sufficient luminance can be obtained. Such a box 26 to which the LED 2 is attached is arranged on the circuit board 20 so that FIGS. 6B and 6C show a side sectional explanatory view and a side explanatory view of one part of the box 26. A linear light source having a constant width (40 mm in this example) is obtained by fixing the circuit board 20 on the bottom surface 14 of the cylindrical body 1 by fixing with screws 27 or the like. By adopting such a structure, a linear light source having a desired length can be obtained with substantially uniform brightness in the linear length direction simply by arranging and fixing the boxes 26 until the required length is obtained. be able to. Further, regarding the width, even when the box body 26 having the opening surface of 40 mm is used, the width W2 of the linear light source is about 60 mm, which can be made smaller than the structure shown in FIG. Also, the size of the box 26 can be set freely.

  In the example shown in FIG. 6, the light diffusing plate 4 whose cross section is curved like a bowl is provided on the opening surface side of the box 26, but the light source using such a box 26 and the curved light diffusing plate are used. 4 may be a flat light diffusing plate as shown in FIG. 1 or the like, and the light diffusing plate 4 may be omitted. Further, in each of the above examples, Such a curved light diffusion plate can also be provided.

  In each of the above-described examples, the outer shape of the cylindrical body 1 is also substantially rectangular. However, even if the outer shape is not necessarily rectangular, the cross-sectional shape of the opening 11 portion (portion where the LED is provided) is substantially rectangular. It suffices that the outer periphery of the cylindrical body 1 has a protruding portion or the like. An example is shown in FIG. The example shown in FIG. 7 has a shape in which one side wall 12 protrudes to the outside through the taper portion 15, but the light emitting portion such as the LED 2 portion is the same as the above-described examples, and the description thereof is as follows. Omitted. With such a shape, for example, when this linear light source is used as it is as a lighting device on a display shelf, in a display shelf that overlaps many stages, the product on the lower shelf is installed on the back surface of the upper shelf. However, from the viewpoint of the observer, the formation of such a tapered portion 15 has the advantage that the illuminating device is not uncomfortable and the appearance is improved.

  An example in which the linear light source is used to make a vertically elongated signboard is shown in FIG. That is, at least one of the side walls corresponding to the short side of the rectangular shape of the housing 51 having an opening surface 51a on at least one surface corresponding to the long side of the rectangular shape in the shape of a vertically long box having a substantially rectangular cross section (see FIG. In the example shown in FIG. 8, the linear light source 50 having any of the above-described structures is provided on the inner surface side of both sides) such that the emitted light is directed toward the side wall opposite to the side wall. A large amount of light is emitted from the linear light source 50 onto the opening surface 51a so that the light is radiated from the opening surface 51a substantially uniformly along the width direction of the opening surface 51a (the lateral direction in FIG. 8B). A transmitted light adjustment sheet 52 having a light reflection film 52b having a transmission region 52a is provided, and a light diffusion plate 53, a display panel 54, and a transparent sheet 55 are provided on the surface side of the transmitted light adjustment sheet 52. The image drawn on the display panel 54 is illuminated by the light from the linear light source 50.

  The housing 51 is formed of, for example, an aluminum plate. 8 is an integral box-like figure, but it is not necessary to form it integrally. The lid can be made as a separate structure and fixed after the display panel is inserted, or the lid can be opened and closed. It can be made into a formula, and it can be set as the structure similar to the conventional electrical signboard. The inside of the housing 51 is preferably formed as a mirror surface as much as possible or formed on a highly reflective surface by applying a light reflecting member. Further, in the example shown in FIG. 8, only one side is the display surface. However, the display can be displayed from the front or the back by setting both sides as the display surface as the display surface. In this case, the housing 51 is composed of only the side walls and the corners, and the rear surface side may be configured similarly to the front surface side such as the transmitted light adjustment sheet 52.

  As schematically shown in FIG. 8C, the transmitted light adjustment sheet 52 is formed with a light transmission region 52a (region in a circle in the figure) having a small area in a portion close to the linear light source 50. A light transmission region 52a having a large area is formed in a portion far from the light source 50, and a light reflecting film 52b (region outside the circle in the drawing) is formed in the other portions. As a result, light is radiated from the light transmission region 52a while being reflected by the light reflection film 52b of the transmitted light adjustment sheet 52 and the inner surface of the housing 51. The transmitted light adjusting sheet 52 is formed so that substantially uniform light is radiated over the entire surface because the light is radiated only from the light source and is emitted from a large area in the portion where the light amount is far from the linear light source 50. The shape of the light transmission region 52a does not have to be circular as shown in the figure, and may be any shape such as a square, and is formed to have uniform brightness by adjusting the area as described above. A light reflection film 52b such as a silver film is formed on the entire surface of a transparent sheet such as polyethylene terephthalate, and a light transmission region 52a is formed by partially removing the film by etching or the like.

  In the example shown in FIG. 8, since the linear light source 50 is provided on both sides of the side wall of the housing 51, the transmitted light adjustment sheet 52 has a large light transmission region 52 a at the center, but only on one side. In the case where the linear light source 50 is provided, as shown in FIG. 9, the light transmission region 52a is formed so that the area of the light transmission region 52a gradually increases toward the opposite side walls.

  The light diffusing plate 53 is, for example, about 3 mm thick, and is made of a plate-like body such as milky white acrylic resin (PMMA), polyethylene terephthalate (PET), polycarbonate, glass or the like, which is commonly called a milk half. It has a function to uniformly radiate in all directions. The light diffusing plate 53 is preferably thicker because it can be made light with no directivity even in the oblique direction coming from the lower surface, but there is almost no unevenness of the light emitted from the transmitted light adjustment sheet 52 on the lower surface. For example, a light diffusion sheet such as a thin vinyl sheet (FF sheet) or a milky white sheet may be used. Further, by providing a prism for condensing light on the light diffusing plate 53 instead of the light diffusing plate 53, the surface luminance can be improved by about twice.

  The display panel 54 is a transparent film sheet on which images to be displayed such as characters and figures are printed in color or the like, and is displayed vividly by being illuminated from the back side by illumination. On the surface side of the display panel 54, a transparent cover 55 having a film shape or a thickness of about several millimeters made of an acrylic plate or a glass plate for protecting the display panel 54 is overlaid.

  The electric signboard shown in FIG. 8 is an example of a vertically long structure that can be placed on the floor or the like, but it can also be an electric signboard with a structure that hangs from the ceiling in a landscape orientation, or a convenience store building It can also be used when displaying a long horizontal display at the top.

  According to the electric signboard of the present invention, even a long electric signboard is a uniform light source in the longitudinal direction of the linear light source, and the width direction perpendicular to the longitudinal direction is also made uniform by the transmitted light adjusting sheet. Therefore, even if it is a long electric signboard, it can be made uniform brightness in the surface, and an electric signboard with excellent display performance can be obtained.

It is a figure explaining one Embodiment of the linear light source by this invention. It is a figure explaining the structural example of LED of the linear light source shown by FIG. It is sectional explanatory drawing which shows the modification of the linear light source of FIG. It is sectional explanatory drawing which shows other embodiment of the linear light source by this invention. FIG. 5 is a cross-sectional explanatory view showing a modification of the linear light source in FIG. 4. It is a figure explaining other embodiment of the linear light source by this invention. It is sectional explanatory drawing which shows the modification of the linear light source of FIG. It is a figure explaining one Embodiment of the electrical signboard by this invention. It is a figure which shows the other example of the transmitted light adjustment sheet | seat of FIG. It is a figure which shows an example of the surface light source for the conventional electrical decoration signboard.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular body 2 Semiconductor light emitting element (LED)
DESCRIPTION OF SYMBOLS 3 Light reflection sheet 4 Light diffusing plate 11 Opening part 12 Side wall 13 Side wall 14 Bottom face 20 Circuit board 26 Tray-like box 31 Through-hole 50 Linear light source 51 Housing 52 Transmitted light adjustment sheet 52a Light transmission area 52b Light reflection film 53 Light diffusion Board 54 Display panel 55 Transparent sheet

Claims (11)

  At least one of a cylindrical body having a substantially quadrangular cross section and having an opening along the longitudinal direction formed on one surface, and a pair of side walls adjacent to the opening of the cylindrical body and extending in the longitudinal direction of the cylindrical body A semiconductor light emitting device provided on the side facing the side wall to emit light, and the semiconductor light emitting devices are arranged at regular intervals in the longitudinal direction of the cylindrical body, and from the opening A linear light source formed to emit light.   The semiconductor light-emitting elements are provided on opposite sides of the side wall, and the semiconductor light-emitting elements provided on both sides of the opposite side wall are arranged along the longitudinal direction of the cylindrical body so as not to face each other in front of each other. The linear light source according to claim 1, wherein the linear light source is provided to be shifted.   The semiconductor light emitting element is provided on both sides of the side wall facing each other, and the semiconductor light emitting element is also provided on the bottom side facing the opening of the cylindrical body, the semiconductor light emitting element being in the longitudinal direction of the cylindrical body The linear light source according to claim 1 or 2, wherein the linear light source is arranged at regular intervals.   The semiconductor light emitting element is provided on both sides of the side wall facing each other, provided with a hole for transmitting light from the semiconductor light emitting element, and provided with a light reflecting sheet having a W-shaped cross section and a low central peak. The linear light source according to claim 1 or 2, which has a structure.   4. The linear shape according to claim 3, wherein a hole is provided for transmitting light from the semiconductor light emitting element, and a light reflecting sheet having a trapezoidal shape with a W-shaped cross section and a low central peak is provided. light source.   A Fresnel lens for diffusing the light emitted from the semiconductor light emitting element in the longitudinal direction of the cylindrical body is provided on the surface side of the semiconductor light emitting element, and the luminance is made uniform along the longitudinal direction. The linear light source according to claim 1, 2, or 3.   A semiconductor having a substantially rectangular cross section, a cylindrical body having an opening along the longitudinal direction on one surface, and a bottom corner of a tray-shaped box whose inner surface is formed as a light reflecting surface and whose side surface is inclined outward. A planar light source provided with a light emitting element and formed so as to emit light substantially uniformly from the opening surface of the tray-like box, wherein the planar light source faces the opening of the cylindrical body A linear light source that emits uniform light from an opening formed in one surface of the cylindrical body by being arranged along the longitudinal direction of the cylindrical body on the bottom surface side.   The linear light source according to claim 1, wherein a light diffusing plate having a light diffusing action is provided in the opening of the cylindrical body.   70% or more of the semiconductor light emitting element provided along the longitudinal direction of the cylindrical body or the semiconductor light emitting element of the planar light source is coated with a light emitting color conversion substance on the surface of a light emitting element chip that emits blue or ultraviolet light. The linear light source according to any one of claims 1 to 8, wherein the linear light source is formed so as to emit white light, and the remaining 10 to 30% are red and / or green semiconductor light emitting elements.   The linear light source according to any one of claims 1 to 9, wherein the cylindrical body has a structure in which at least one side wall has an outer shape protruding outward through a tapered portion.   A vertically long box-shaped cross section having a housing having an opening surface on at least one surface corresponding to the long side of the rectangular shape, and at least one of the side walls corresponding to the rectangular short side of the housing A linear light source provided on the inner surface side so that radiant light is directed toward the side wall opposite to the side wall, and provided on the opening surface, and the light from the linear light source is substantially along the width direction of the opening surface A transmitted light adjusting sheet on which a light reflecting film having a large number of light transmitting regions is formed so as to be uniformly emitted from the opening surface, and a display panel provided on the surface side of the transmitted light adjusting sheet, The electric signboard in which the linear light source is used as the linear light source according to any one of claims 1 to 10.

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