JP2007059163A - Luminescent panel and luminescent material using the same - Google Patents

Abstract

【Task】
While having a simple structure, the entire light emitting surface emits light uniformly with sufficient brightness according to the purpose of use, while suppressing temperature rise and reducing power consumption.
[Solution]
The showcase includes a display plate and a shelf on the light emitting panel 20, and a cover is provided throughout. The light emitting panel 20 includes an irradiation unit 36 on the side surface of the case 22 whose main surface opening is covered with a light transmissive light guide plate 30. The irradiation unit 36 is arranged so as to be sandwiched between the irradiation cover 38, the transparent body 56 having a substantially circular cross section supported on the inside thereof, and the irradiation cover 38 and the transparent body 56, and a plurality of the irradiation bodies 36 irradiate light. It is comprised by LED. When the LED emits light, the light is incident on the inside of the case 22 from multiple directions due to the lens effect of the transparent body 56, reflected by the white reflector 26, and further scattered by the scattering portion 32. The whole appears to emit light uniformly and brightly.
[Selection] Figure 2

Description

  The present invention relates to a light-emitting panel and a light-emitting material using the same, and more specifically to improvement of surface light emission uniformity and brightness.

  In general lighting devices such as fluorescent lamps, a reflecting member is provided behind or to the side of the light source. Light rays from a light source (fluorescent lamp or incandescent lamp) are once applied to the reflecting member and reflected in a desired illumination direction, thereby increasing the brightness of the luminaire and scattering from a wide surface of the reflecting member. To provide a soft light. Conventionally, a paint containing a white pigment such as titanium oxide has been used as a lighting fixture reflecting member such as a fluorescent lamp, but the absorption rate of energy of visible light irradiated to these reflecting members is high (14 to 17). %), There is a problem that the illumination efficiency is lowered accordingly. In addition, the use of a reflective member complicates the mounting structure. Furthermore, with fluorescent lamps and incandescent lamps, the temperature rises when the lamps are lit continuously. Not only becomes complicated, but also inconvenient in terms of power consumption.

On the other hand, in recent years, focusing on power consumption and illumination efficiency, many lighting fixtures using LEDs (light emitting diodes) as light sources have been proposed. For example, Patent Document 1 below discloses an illumination device that can irradiate an irradiation surface relatively uniformly with few light emitting diodes.
JP 2003-77321 A

  However, in general, lighting fixtures using LEDs tend to have insufficient light intensity compared to incandescent bulbs, etc., and depending on the installation location and usage location of the lighting fixture, obtain sufficient brightness according to the purpose. May not be possible. In particular, in a lighting fixture using a single LED, when the shape of the fixture is a line shape (straight shape), generally, the portion closer to the light source is brighter and becomes darker as the portion is farther, and the brightness of the entire fixture is irradiated. There is a strong tendency for unevenness. For this reason, also in patent document 1 mentioned above, while having arrange | positioned several light emitting diodes to one direction, it becomes a structure provided with a reflection means (reflective member). As described above, when a plurality of LEDs are arranged at an appropriate interval, it becomes possible to eliminate unevenness in brightness and to emit light almost uniformly, but the brightness is insufficient depending on the application. In some cases. Furthermore, in the case of a panel shape, since it is necessary to provide a larger number of light sources in the light emitting surface, the structure becomes complicated and the design is not good.

  The present invention focuses on the above points, and its purpose is to make the entire light emitting surface uniformly emit light with sufficient brightness according to the purpose of use, while suppressing the increase in temperature and power consumption, while having a simple structure. It is providing the light emission panel which can aim at the reduction | decrease, and the luminescent material using the same.

  In order to achieve the above object, a light emitting panel according to the present invention has a reflective case in which at least one of the opposing main surfaces is open, translucent, and a light guide plate that covers the open main surface of the reflective case, Provided on the side surface of the reflective case, and provided with an irradiating means for irradiating light in the reflective case, the irradiating means has translucency, and the cross section is substantially arcuate or substantially circular, A transparent body arranged along the side surface of the irradiation case, provided to cover an outer peripheral surface excluding the light irradiation side of the transparent body, a cover to which the transparent body is attached, the transparent body and the cover A plurality of light sources that are arranged along the transparent body so as to be in a non-adherent state or a close state on the surface of the transparent body, and irradiate the transparent body with light. .

  A light emitting panel according to another aspect of the invention has a reflective case having at least one of the opposed main surfaces open, translucent, a light guide plate housed inside the reflective case, and provided on a side surface of the reflective case. And an irradiating means for irradiating light into the light guide plate from the side surface of the light guide plate, and a diffusion plate for covering the open main surface of the reflecting case, and the irradiating means has translucency. The transparent section disposed along the side surface of the irradiation case, the outer surface of the transparent body excluding the light irradiation side is provided so as to cover the transparent surface. A cover to which a body is attached, and disposed between the transparent body and the cover so as to be in a non-contact state or a close state to the surface of the transparent body, and irradiates the transparent body with light Characterized by having a plurality of light sources .

  One of the main forms is characterized in that the light source is a light emitting diode. In another embodiment, the light guide plate includes a flat transparent plate and a scattering portion formed on one of the main surfaces, and the main surface on the side where the scattering portion is not formed is the reflective surface. It is arranged to face the outside of the case. Still another embodiment is characterized in that the cover and the reflection case have heat dissipation properties, a heat conductive sheet is provided between the cover and the light source, and the transparent body is made of resin or glass. To do.

  The luminescent material of the present invention is characterized by using any of the light-emitting panels described above. One of the main forms is characterized in that the luminescent material is one of a showcase, a display panel, and a guide panel. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  The present invention is a reflection in which a main surface opening is covered with a light guide plate by an irradiating means for introducing light from a light source to a transparent body having translucency and having a curved portion having a substantially circular arc shape or a substantially circular cross section. Since the light is applied to the light guide plate in the case or in the reflection case whose main surface opening is covered with the diffuser, the entire light emitting surface is uniformly illuminated with sufficient brightness according to the purpose of use. be able to. In addition, by using the LED as the light source, it is possible to suppress the temperature rise and reduce power consumption.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the appearance of the showcase of the present embodiment. 2A and 2B are views showing a light emitting panel of the showcase, in which FIG. 2A is an external perspective view, FIG. 2B is an exploded perspective view, and FIG. 2C is the above (A) along line # A- # A. Sectional drawing cut | disconnected and seen in the arrow direction, (D) is a perspective view which shows another example. FIG. 3A is an exploded perspective view showing the structure of the irradiation section of this embodiment, and FIG. 3B is a circuit diagram of this embodiment. In this embodiment, the light-emitting panel of the present invention is applied to a showcase for displaying food and the like.

  As shown in FIG. 1, the showcase 10 of the present embodiment includes a translucent display plate 12 and a shelf 13 on a light emitting panel 20 that emits light on the upper surface side. Cover 14 is provided. The cover 14 also has translucency so that the exhibits 16 arranged on the display board 12 and the shelf 13 can be seen from the outside. The display plate 12, the shelf 13, and the cover 14 are formed of a transparent material such as acrylic or glass, for example. The entire showcase 10 is installed and fixed at the exhibition place by the support base 18. In the showcase 10 of this embodiment, as the exhibit 16, for example, confectionery and the like whose temperature is preferably kept at about normal temperature or lower are displayed.

  As shown in detail in FIG. 2, the light emitting panel 20 includes a case 22, a light guide plate 30 having translucency provided in an open portion 24 on one main surface of the case 22, and an inner side surface of the case 22. It is provided and includes an irradiation unit 36 that irradiates light inside the case 22. In the present embodiment, one irradiation unit 36 is provided on each inner side of the short side of the case 22 as illustrated. The light guide plate 30 is made of, for example, translucent acrylic resin or glass, and a scattering portion (or diffusion portion) 32 for diffusing light is formed on the main surface on the case 22 side. For example, the scattering portion 32 is subjected to diffusion processing such as matting, V-cutting, and dot printing.

  First, the case 22 has a substantially rectangular parallelepiped shape having a predetermined thickness, and substantially the whole of one main surface is open, and the transparent side of the light guide plate 30 extends outside the case 22 at the edge of the opening 24. It is fixed by appropriate means so as to face. A white reflector 26 is provided on the inner bottom surface and side surface of the case 22. Although a white plate is used here, it can be substituted by applying a white tape or applying a white paint. As the material of the case 22, various known materials such as an aluminum plate and a plastic plate are used. However, for example, an aluminum plate is conveniently used to improve heat dissipation.

  Next, the irradiation unit 36 will be described. In this embodiment, one irradiation unit 36 is provided on each side surface on the short side of the case 22, and introduces light into the case 22. The irradiation unit 36 has an LED (light emitting diode) 48 that is a light source and a bar having a substantially circular cross section in contact with the LED 48 in an irradiation cover 38 that is set to be slightly shorter and thinner than the side surface. A (or cylindrical) transparent body 56 is housed. As shown in FIG. 3 (A), the irradiation cover 38 has a substantially U-shaped cross-section with the opening 40 side slightly squeezed so that the opening 40 can be pushed outward slightly. (For example, an aluminum plate or a plastic plate). For the irradiation cover 38, for example, as with the case 22, it is more convenient to use an aluminum plate with high heat dissipation.

  A plurality of the LEDs 48 are arranged so as to straddle the electrode patterns 46A and 46B formed in parallel on the flexible substrate 44 having substantially the same shape as the bottom surface 42 of the irradiation cover 38, and the ends of the electrode patterns 46A and 46B. Lead wires 50 and 52 are connected to the respective sections. As the electrode patterns 46A and 46B, for example, copper is used, and is printed on the flexible substrate 44 in advance. The number of LEDs 48 provided on the electrode patterns 46A and 46B is arbitrary, but in this embodiment, ten LEDs 48 are arranged at equal intervals. The transparent body 56 is formed to have substantially the same length as the irradiation cover 38, and the diameter thereof is set to be substantially the same as the width of the bottom surface 42 of the irradiation cover 38. As the transparent body 56, for example, a translucent transparent rod-shaped body made of an acrylic resin is used.

  First, the LEDs 48 are arranged so as to straddle the parallel electrode patterns 46A and 46B formed on the flexible substrate 44, and the terminals (not shown) of the LEDs 48 are connected to the electrode patterns 46A and 46B. Then, lead wires 50 and 52 are connected to the end portions of the electrode patterns 46A and 46B by appropriate means, respectively. Next, the flexible substrate 44 provided with the LEDs 48 in this manner is attached to the bottom surface 42 of the irradiation cover 38, and the transparent body 56 is fitted from the open portion 40 from above to be brought into contact with or close to the LEDs 48. At this time, since the diameter of the transparent body 56 is set to be slightly larger than the width of the opening portion 40, the opening portion 40 is pushed and expanded. Then, the transparent body 54 is fixed to the irradiation case 38 by the force of the opening portion 40 returning to the inside.

  One lead wire 50 connected to the LED 48 is connected to one terminal of a power source 58 (see FIG. 3B) provided outside the case 22, and further connected to the other terminal of the power source 58. The lead wire is connected to another lead wire 52 connected to the LED 48 via the switch 60. That is, as shown in FIG. 3 (B), a power source 58 is connected to 10 LEDs 48 connected in parallel via a switch 60. By switching the switch 60 ON / OFF, The LED 48 can be switched on and off. The other irradiation unit 36 has the same configuration, and the lead wires thereof are connected to the power source 58 and the switch 60. Note that the arrangement and circuit diagram of the LED 48 shown in FIGS. 3A and 3B are merely examples, and may be appropriately changed so as to achieve the same effect, such as a series-parallel circuit.

  Next, the operation of this embodiment will be described. The light emitting panel 20 is fixed on the support base 18 as shown in FIG. 1 so that the light guide plate 30 is on the upper surface side. Then, the display plate 12 and the shelf 13 are provided on the light emitting panel 20, and a desired display 16 is arranged on them, and then the cover 14 is put on the whole. When the display is completed, the switch 60 is turned on, electricity is supplied from the power source 58 to the LED 48 provided in the irradiation unit 36 to energize the LED 48, and the LED 48 is turned on and directed into the case 22 through the transparent body 56. Irradiate with light. Light that has entered the transparent body 56 from the LED 48 is refracted and diverged by the lens effect of the transparent body 56 having a substantially circular cross section, and enters the case 22 from multiple directions.

  At this time, since the white reflecting plate 26 is provided on the bottom surface and the side surface in the case 22, light incident from multiple directions through the transparent body 56 is diffused to the entire interior by the white reflecting plate 26, Further, the light is scattered by the scattering portion 32 and is emitted to the outside of the case 22. When the showcase 10 in such a state is viewed from the outside, the entire light emitting panel 20 appears to be uniformly bright, and the displayed exhibit 16 can be clearly seen.

Thus, according to the first embodiment, there are the following effects.
(1) Light is irradiated from the side surface into the case 22 in which the main surface opening 24 is covered with the light guide plate 30 by the irradiation unit 36 for introducing light from the LED 48 to the transparent body 56 having a substantially circular cross section having translucency. I decided to irradiate. For this reason, the whole light emission surface of the light emission panel 20 can be light-emitted uniformly with sufficient brightness according to the utilization purpose.
(2) Since the LED 48 is used as the light source, the temperature rise is small compared with the case where an incandescent lamp or a fluorescent lamp is used, and the influence on the exhibit 16 due to heat can be suppressed. For this reason, it is convenient for display of confectionery using a cream that melts when the temperature rises. In addition, power consumption can be reduced.
(3) Since the LED 48 is turned on and off by the switch 60 as necessary, unnecessary illumination such as turning on a part of the irradiation unit 36 can be omitted.

  In the above-described embodiment, the irradiation unit 36 is built one by one inside the side surface on the short side of the case 22, but may be provided only on one side surface. Further, as in the example shown in FIG. 2 (D), an opening 70 for inserting the irradiation unit 36 is provided on one side of the long side of the case 22 so that the irradiation unit 36 can be attached and detached. It is good also as a structure.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. The present embodiment is another example of the light-emitting panel used in the showcase of the above-described embodiment. 4A is an external perspective view of the present embodiment, and FIG. 4B is a cross-sectional view taken along line # B- # B and viewed in the direction of the arrow. In addition, the same code | symbol shall be used for the component which is the same as that of Example 1 mentioned above, or respond | corresponds. As shown in FIG. 4, the light emitting panel 80 of the present embodiment includes a light guide plate 82 housed inside a case 22 having the same configuration as that of the first embodiment, and the main surface opening 24 of the case 22 is The diffusion plate 86 is covered. Further, an irradiation unit 90 for irradiating light into the light guide plate 82 from the side surface of the light guide plate 82 is provided on one side surface on the short side of the case 22.

  The light guide plate 82 is formed of, for example, translucent acrylic resin, glass, or the like, and has a special process 84 (for diffusing light) on one main surface (the lower surface side in the illustrated example). For example, matte, V cut, dot printing, etc.) are applied. Such a light guide plate 82 is accommodated in the case 22 so that the transparent side faces the main surface opening 24. In the present embodiment, for example, aluminum having high heat dissipation is used as the case 22. Further, the diffusion plate 86 covering the main surface opening 24 is formed, for example, by applying a process such as matting to an acrylic resin or the like, but a sheet subjected to a diffusion process may be used.

  On the other hand, the irradiation unit 90 basically has an LED 48 as a light source and a bar-shaped transparent body having a substantially circular cross section in contact with the LED 48 in the irradiation cover 38 as in the irradiation unit 36 of the first embodiment. 56 is housed. In this embodiment, in addition to this, a heat conductive sheet 92 having heat conductivity is provided between the substrate 44 on which the LEDs 48 are arranged and the bottom surface of the irradiation cover 38. For example, a graphite sheet or the like is used as the heat conductive sheet 92, but other known sheets having various heat conductivity may be used.

  Next, the operation of this embodiment will be described. When the LED 48 is turned on, the light incident on the transparent body 56 is refracted and diverged by the lens effect of the transparent body 56 having a substantially circular cross section, and multidirectional from the side surface (end surface) of the light guide plate 82 into the light guide plate 82. Incident from. The light incident on the light guide plate 82 is diffused to the entire interior by the special processing 84 on the bottom surface of the light guide plate 82 and the white reflecting plate 26 inside the case 22, and further scattered by the diffuser plate 86 and emitted to the outside. The When the light emitting panel 80 in such a state is viewed from the outside, the whole appears uniformly bright. At this time, the heat generated by the lighting of the LED 48 is conducted to the heat conducting sheet 92 through the substrate 44 and led to the radiation cover 38 having heat dissipation properties. The heat guided to the irradiation cover 38 is further radiated to the outside through the cover 22 having heat dissipation properties.

  As described above, according to the second embodiment, even when the light guide plate 82 is housed inside the case 22, the entire light emitting surface of the light emitting panel 80 can emit light uniformly with sufficient brightness. Moreover, since the heat generated by the lighting of the LED 48 is positively radiated to the outside through the heat conducting sheet 92, the irradiation cover 38, and the case 22, a better temperature rise suppressing effect can be obtained.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. This embodiment is an example in which the light emitting panel of the present invention is applied to a guidance panel used for guidance at various venues. As shown in FIG. 5, in the guide panel 100 of this embodiment, a light emitting panel 101 in which a light guide plate 104 is provided in a main surface opening of a case 106 is supported by a frame 108 erected by legs 110. . An irradiation unit (not shown) having the same configuration as that of the first or second embodiment described above is provided on the inner side of the case 106. Note that the position where the irradiation unit is provided may be any of the upper, lower, left and right positions, and may be provided on only one side surface, or may be provided on a plurality of side surfaces. On the surface of the light guide plate 104, for example, letters 102 and arrows for indicating locations such as an entrance of an exhibition hall and a reception are provided. Such characters 102 and the like are appropriately formed by a technique such as pasting a desired character printed on a transparent seal (not shown) on the surface of the transparent plate 106. The basic operations and effects of the present embodiment are the same as those of the first or second embodiment described above, and the light emitted from the irradiation unit provided inside is scattered by the light guide plate 104 so that the entire panel is uniformly bright. Emits light.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shape and size shown in the above embodiment are merely examples, and can be appropriately changed so as to achieve the same effect. For example, in the above-described embodiment, the light emitting panels 20 and 80 are substantially rectangular. However, the irradiation unit 36 may be provided inside a circular case.
(2) The transparent body 56 is preferably transparent and colorless, but does not prevent the transparent body 56 from being colored. Moreover, in the said Example 1, although the acrylic resin was mentioned as an example as the transparent body 56, it is good also considering other well-known various resin (for example, PC etc.) and glass.
(3) A light source other than the LED 48, such as a cold cathode tube, may be used as the light source, but the LED is most suitable in consideration of power consumption and temperature.
(4) The LED 48 may use a single color light emission or a multicolor light emission.
(5) The number of LEDs 48 shown in the above embodiment is also an example, and may be increased or decreased as necessary.
(6) The position where the irradiation units 36 and 90 are provided is also an example, and may be appropriately changed according to the shape of the case 22 or 106. Moreover, the irradiation parts 36 and 90 may be detachable or built-in, and the attachment mechanism thereof may be appropriately changed so as to achieve the same effect.
(7) In the first embodiment, the power source 58 and the switch 60 are provided outside the case 22, but a battery serving as a power source is provided inside the case 22, and the switch 60 is provided on the side surface of the case 22. The design can be changed as appropriate so as to achieve the same effect.
(8) The transparent body 56 shown in the above embodiment is also an example, and the shape can be changed as necessary as long as it has a curved surface portion having a lens effect, such as using a long object having a substantially arc-shaped cross section. is there.
(9) The showcase 10 and the guide panel 100 shown in the above embodiment are merely examples, and the present invention can be applied to all types of luminescent materials using the luminescent panel.
(10) The scattering portion 32, the special processing 84, and the diffusion plate 86 shown in the above embodiment are also examples, and any treatment may be performed as long as it can scatter or diffuse light. .

  According to the present invention, the inside of the reflection case whose main surface opening is covered with the light guide plate by the irradiating means that introduces light from the light source into the transparent body having translucency and having a substantially arc shape or substantially circular cross section, Alternatively, light is emitted to the light guide plate in the reflection case whose main surface opening is covered with a diffusing plate, and the entire light emitting surface is uniformly emitted with sufficient brightness according to the purpose of use. Applicable. In particular, by using an LED as the light source, temperature rise can be suppressed and power consumption can be reduced, which is suitable for applications such as showcases that display items that are easily affected by temperature changes.

It is a perspective view which shows the external appearance of the showcase of Example 1 of this invention. It is a figure which shows the light emission panel of the said Example 1, (A) is an external appearance perspective view, (B) is a disassembled perspective view, (C) is said (A) cut | disconnected along the # A- # A line, and an arrow Sectional drawing seen in the direction, (D) is a perspective view showing another example. It is a figure which shows the said Example 1, (A) is a figure which shows the structure of an irradiation part, (B) is a circuit diagram of a present Example. It is a figure which shows Example 2 of this invention, (A) is an external appearance perspective view, (B) is sectional drawing which cut | disconnected said (A) along the # B- # B line | wire and looked at the arrow direction. . It is a perspective view which shows the external appearance of Example 3 of this invention.

Explanation of symbols

10: Showcase 12: Display board 13: Shelf 14: Cover 16: Exhibit 18: Support stand 20: Light emitting panel 22: Case 24: Opening part 26: Reflecting plate 30: Light guide plate 32: Scattering part 36: Irradiation part 38 : Irradiation cover 40: Open part 42: Bottom surface 44: Flexible substrate 46A, 46B: Electrode pattern 48: LED (light emitting diode)
50, 52: Lead wire 56: Transparent body 58: Power supply 60: Switch 70: Insertion port 80: Light emitting panel 82: Light guide plate 84: Special processing 86: Diffusion plate 90: Irradiation part 92: Heat conduction sheet 100: Guide panel 102 : Character 104: Light guide plate 106: Case 108: Frame 110: Feet

Claims (9)

A reflective case with at least one of the opposing main surfaces open,
A light guide plate having translucency and covering an open main surface of the reflection case;
An irradiating means that is provided on a side surface of the reflecting case and irradiates light in the reflecting case;
And the irradiation means
A transparent body having translucency and having a substantially arcuate or substantially circular cross section and disposed along a side surface of the irradiation case;
A cover provided so as to cover an outer peripheral surface excluding the light irradiation side of the transparent body, to which the transparent body is attached;
Between the transparent body and the cover, a plurality of light sources that are arranged along the transparent body so as to be in a non-adherent state or a proximity state to the surface of the transparent body, and irradiate the transparent body with light,
A light emitting panel characterized by comprising: A reflective case with at least one of the opposing main surfaces open,
A light guide plate having translucency and housed inside the reflective case;
Irradiation means that is provided on the side surface of the reflection case and that irradiates light into the light guide plate from the side surface of the light guide plate,
A diffusion plate covering an open main surface of the reflective case;
And the irradiation means
A transparent body having translucency and having a substantially arcuate or substantially circular cross section and disposed along a side surface of the irradiation case;
A cover provided so as to cover an outer peripheral surface excluding the light irradiation side of the transparent body, to which the transparent body is attached;
Between the transparent body and the cover, a plurality of light sources that are arranged along the transparent body so as to be in a non-adherent state or a proximity state to the surface of the transparent body, and irradiate the transparent body with light,
A light emitting panel characterized by comprising:   The light-emitting panel according to claim 1, wherein the light source is a light-emitting diode.   The light guide plate includes a flat transparent plate and a scattering portion formed on one of the main surfaces, and the main surface on which the scattering portion is not formed faces the outside of the reflection case. The light-emitting panel according to claim 1, wherein the light-emitting panel is arranged as described above.   The light emitting panel according to claim 1, wherein the cover and the reflective case have heat dissipation properties.   The light emitting panel according to claim 5, wherein a heat conductive sheet is provided between the cover and the light source.   The light emitting panel according to claim 1, wherein the transparent body is made of resin or glass.   A luminescent material using the luminescent panel according to claim 1. The luminescent material according to claim 8, wherein the luminescent material is one of a showcase, a display panel, and a guide panel.

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