WO2012105315A1 - Shelf-use light guide element and lighting device - Google Patents

Shelf-use light guide element and lighting device Download PDF

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Publication number
WO2012105315A1
WO2012105315A1 PCT/JP2012/050894 JP2012050894W WO2012105315A1 WO 2012105315 A1 WO2012105315 A1 WO 2012105315A1 JP 2012050894 W JP2012050894 W JP 2012050894W WO 2012105315 A1 WO2012105315 A1 WO 2012105315A1
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WO
WIPO (PCT)
Prior art keywords
light
surface
shelf
guide element
light guide
Prior art date
Application number
PCT/JP2012/050894
Other languages
French (fr)
Japanese (ja)
Inventor
谷尻 靖
佳恵 清水
Original Assignee
コニカミノルタオプト株式会社
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Publication date
Priority to JP2011023394 priority Critical
Priority to JP2011-023394 priority
Application filed by コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Publication of WO2012105315A1 publication Critical patent/WO2012105315A1/en

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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47FSPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F11/00Arrangements in shop windows, shop floors or show cases
    • A47F11/06Means for bringing about special optical effects
    • A47F11/10Arrangements of light sources
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40Lighting for industrial, commercial, recreational or military use
    • F21W2131/405Lighting for industrial, commercial, recreational or military use for shop-windows or displays
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

In order to obtain a shelf-use light guide element and a lighting device capable of bright, highly efficient, and uniform illumination in a desired specific direction through light distribution control of light from a light source, the shelf-use light guide element (1A-1H) has: a reflective surface that is provided with a first reflecting surface (12Aa) having a diffusing part (14) for totally reflecting incident light while diffusing the incident light within a predetermined angular range; and an exit surface (13A) that is provided at a tilt with respect to the first reflecting surface to such an extent that light reflected off the first reflecting surface is emitted after partially refracted while the remainder of the light is totally reflected. The lighting device (10A-10H) is equipped with the shelf-use light guide element (1A-1H) and point light sources (point light sources (2)).

Description

Light guide element for shelf and lighting device

The present invention relates to a light guide element for a shelf board and a lighting device, for example, a lighting device suitable for lighting a product arranged in a showcase or the like and displayed on a shelf board of a showcase, and a shelf board guide used therefor. The present invention relates to an optical element.

Conventionally, fluorescent lamps have been widely used to illuminate products placed in showcases and displayed in showcases. Fluorescent lamps are generally used as illumination by converting electric energy into visible radiation, infrared radiation, and ultraviolet radiation and emitting visible light. At that time, since heat loss occurs, there is a problem that not only the fluorescent lamp itself but also the displayed product is heated by the radiant heat from the fluorescent lamp, and the light source of the lighting device for the showcase is not necessarily preferable. That's not true.

In recent years, along with improvement in luminous efficiency and increase in the amount of emitted light, lighting devices using LEDs (Light Emitting Diodes), which are considered to be environmentally friendly with long life and low power consumption, are being put into practical use. Since the blue LED chip was developed, a white LED light source that emits white light by combining the blue LED chip and a phosphor that is excited by light from the LED chip and emits excitation light of a predetermined wavelength, A white LED light source that synthesizes white light using three primary color LED chips of a blue LED chip, a green LED chip, and a red LED chip has been developed.

Therefore, it is preferable to use an LED lighting device provided with this white LED light source as the lighting device because it can reduce power consumption and prolong the product life. In particular, as a lighting device for a display shelf such as a showcase, it has been sought to use an LED light source that consumes less power and generates less heat. For example, a guard for preventing a product from falling on a front end of a display shelf There has already been proposed a showcase having a configuration in which an LED illumination device is arranged on the lower side and irradiated toward a product on a shelf (see, for example, Patent Document 1).

In addition, there has already been proposed a showcase in which an LED light source is disposed in a price rail provided at the front end of a display shelf and the upper and lower sides of the shelf are irradiated via a reflector provided on the front side of the light source ( For example, see Patent Document 2).

JP 2010-82115 A JP 2010-78251 A

By the way, in the showcase described in Patent Document 1, the guard is made of a light-transmitting plate material, and light emitted from the LED light source through the guard is directed toward the product on the shelf. The light is greatly scattered and darkened, resulting in a problem that illumination cannot be performed uniformly and efficiently.

Moreover, in the structure which illuminates the upper and lower sides of the shelf simultaneously with one LED light source as in the showcase described in Patent Document 2, it is possible to efficiently illuminate with a small number of light sources. The number of points can be suppressed and cost reduction can be achieved. However, since the product is illuminated by the reflected light from the reflector installed on the front side of the shelf, the product is only illuminated by changing the direction of the light emitted from the light source. The directivity control and light distribution control of illumination light cannot be performed.

Therefore, when tall products such as milk cartons and beverage bottles are displayed on the shelf, both the illumination light from the top and the illumination light from the bottom reach the middle of the product on which a clean trademark or logo is printed. It becomes difficult, and there is a risk that the effect of appealing to consumers' sight and arousing purchasing will be reduced.

In addition, in order to reduce costs and improve design, a compact configuration using a shelf light guide element that diffuses light emitted from a light source into a predetermined range and can efficiently guide light in a desired direction. It is preferable to use an illumination device.

The present invention has been made in view of the above circumstances, and provides a light guide element for a shelf plate and an illumination device capable of controlling light distribution of a light source to illuminate brightly and efficiently uniformly in a desired specific direction. The purpose is to do.

To achieve the above object, the present invention provides a light guide element including an incident surface on which light emitted from a light source is incident, a reflective surface that reflects incident light, and an emission surface that emits reflected light. The reflection surface includes a first reflection surface that totally reflects incident light, and the emission surface refracts a part of the light totally reflected by the first reflection surface and emits the remaining light. The exit surface is inclined with respect to the first reflecting surface so as to totally reflect light, and the maximum intensity light of the emitted light is emitted in a direction inclined with respect to the normal direction of the exit surface, and the first reflecting surface is incident. The light guide element for the shelf plate is provided along the front end portion of the shelf plate and illuminates at least one of the upper and lower sides of the shelf plate, while being provided with a diffusion portion that totally reflects the diffused light in a predetermined angle range. It is a feature.

According to the above configuration, it is possible to effectively illuminate a specific direction at a position different from the light source from the front end of the shelf board. In addition, since light is emitted in an oblique direction from an exit surface that is nearly parallel to the reflective surface, light is emitted with high intensity in a specific direction, and color unevenness due to color dispersion on the exit surface is reduced through a diffusion unit provided in the first reflective surface. Irradiation with a uniform color is possible. Furthermore, since the light reflected with high efficiency using the total reflection light is refracted from the exit surface and emitted, the shelf that can control the light distribution of the point light source to illuminate efficiently and uniformly in the desired specific direction. A light guide element for a plate can be obtained.

Further, the present invention is characterized in that in the light guide element for a shelf board configured as described above, the diffusion portion diffuses at a diffusion angle capable of suppressing occurrence of color unevenness. According to this configuration, the reflective surface is provided with a rough surface that can be diffused at a predetermined small diffusion angle, small unevenness, and a diffuse reflection sheet is applied, thereby uniformly mixing colors and effectively reducing color unevenness. can do.

In the shelf light guide element having the above-described configuration, the present invention is characterized in that the maximum intensity light of the emitted light is emitted in a direction inclined at an angle larger than 30 degrees with respect to the normal direction of the emission surface. According to this configuration, light can be emitted with high intensity in a specific direction inclined by 30 degrees or more from the emission surface.

In the shelf light guide element having the above-described configuration, the present invention is characterized in that the exit surface is inclined by 1 to 30 degrees with respect to the first reflecting surface from a parallel position. According to this configuration, the light totally reflected on the emission surface is reflected again on the first reflection surface and the angle of the light emitted from the emission surface is close to the angle of the light emitted first. Bright light can be irradiated.

Further, in the shelf light guide element having the above-described configuration according to the present invention, the incident surface is inclined so that light incident substantially perpendicular to the incident surface is totally reflected from the first reflecting surface. It is characterized by. According to this configuration, the light totally reflected by the first reflecting surface is incident substantially perpendicular to the incident surface, so that Fresnel reflection on the surface of the incident surface can be reduced, resulting in high illuminance.

In the shelf light guide element having the above-described configuration, the present invention is characterized in that the incident surface is inclined by 50 to 80 degrees from a parallel position with respect to the first reflecting surface. According to this configuration, since the incident surface vertically enters the totally reflected light of the first reflecting surface, the Fresnel reflection on the surface is reduced and the illuminance is high.

In the light guide element for a shelf board according to the present invention as described above, the incident surface is long enough to allow a plurality of the light sources to be arranged in parallel at a predetermined interval. It has a surface. According to this configuration, a plurality of light sources can illuminate widely in the longitudinal direction with high illuminance, and light from each light source is diffused, so that unevenness in luminance of the plurality of light sources can be reduced and uniform irradiation can be achieved. It becomes a light guide element for shelves.

In the shelf light guide element having the above-described configuration, the reflective surface faces the first reflective surface substantially in parallel and receives light from the first reflective surface toward the first reflective surface. It has the 2nd reflective surface to reflect, It is characterized by the above-mentioned. According to this configuration, it is possible to irradiate a position away from the light source. In addition, since the second reflecting surface is substantially parallel to the first reflecting surface, the light totally reflected by the first reflecting surface is totally reflected by the second reflecting surface and becomes highly efficient reflection. In addition, since the optical path length from the light source to the emission surface becomes long, the interval between the light sources arranged in parallel can be increased, and the number of light sources installed can be reduced.

In the shelf light guide element having the above-described configuration, the present invention is characterized in that the diffusing portion is provided in a portion that reflects reflected light toward the exit surface. According to this configuration, since the light traveling toward the exit surface is diffused, color unevenness can be efficiently reduced. Further, since the light can be guided to the diffusing portion without increasing the luminous flux, the light can be guided while maintaining a high illuminance, and unevenness in brightness and color can be reduced.

The present invention also includes a light source, an incident surface on which light emitted from the light source is incident, a reflection surface that reflects incident light, and a light guide element that includes an emission surface that emits reflected light. It is the illuminating device provided, Comprising: The light guide element for shelf boards as described in any one of Claim 1 to 9 was provided as the said light guide element.

According to the above configuration, it is possible to obtain an illuminating device that can illuminate efficiently and uniformly in a desired specific direction by controlling light distribution of the light source.

In the illumination device having the above-described configuration, the shelf light guide element includes a pair of shelf light guide elements having first and second light guide elements, and light emitted from one light source. The light is guided in two different directions. According to this configuration, two different directions can be set as specific directions that can be illuminated efficiently and uniformly, and two different specific directions can be illuminated uniformly using one light source.

Moreover, the present invention is the illumination device having the above-described configuration, wherein the light guide element for shelf plate is an integrated type including a branching portion that branches light emitted from the light source in two different directions, and the light emitted from one light source. It has the 1st and 2nd light guide part which light-guides in two different directions, It is characterized by the above-mentioned. According to this configuration, it is possible to obtain an illuminating device that can uniformly illuminate two different specific directions at low cost by using a light guide element for a shelf board having a simple and small structure.

Further, the present invention is characterized in that the light source is a point light source in the illumination device having the above-described configuration. By using a point light source as the light source, it is possible to irradiate light with high intensity in a specific direction.

Further, the present invention is characterized in that the point light source is an LED light source in the illumination device having the above configuration. By using an LED light source as the light source, it is possible to provide an illumination device with high light intensity at low cost.

Further, the present invention provides a lighting device having the above-described configuration, wherein a plurality of the light sources are arranged in parallel at predetermined intervals, and have a long incident surface, a reflecting surface, and an exit surface along a longitudinal direction in which the light sources are arranged in parallel. It is characterized by being installed along the section. According to this configuration, for example, the upper and lower sides of the shelf board can be illuminated at the same time, and the lighting device can efficiently and uniformly illuminate the products displayed on the shelf board of the showcase.

According to the present invention, the reflection surface includes the first reflection surface having the diffusion portion that totally reflects the incident light within a predetermined angle range, and refracts part of the light reflected by the first reflection surface. The shelf light guide element emits from the exit surface that is inclined with respect to the first reflection surface to the extent that it totally reflects the remaining light. It is possible to obtain a light guide element for shelves that can illuminate brightly, efficiently and uniformly. Moreover, it is possible to obtain an illuminating device that can illuminate brightly and efficiently in a desired specific direction by controlling the light distribution of the light source using the light guide element for a shelf board.

It is a schematic sectional drawing which shows the illuminating device provided with the light guide element for shelf boards of 1st embodiment which concerns on this invention. It is a schematic front view of FIG. 1A. It is a schematic side view which shows the optical path inside the light guide element for shelf boards of 1st embodiment. It is explanatory drawing which shows the relationship between an incident angle and chromatic dispersion. It is a schematic sectional drawing which shows the illuminating device provided with the light guide element for shelf boards of 2nd embodiment which concerns on this invention. It is a schematic sectional drawing which shows the illuminating device provided with the light guide element for shelf boards of 3rd embodiment which concerns on this invention. It is a schematic sectional drawing which shows the illuminating device provided with the optical element for guide shelf boards of 4th embodiment which concerns on this invention. It is a schematic sectional drawing which shows the illuminating device provided with the light guide element for shelf boards of 5th embodiment which concerns on this invention. It is a schematic sectional drawing which shows the illuminating device provided with the light guide element for shelf boards of 6th embodiment which concerns on this invention. It is a schematic front view of FIG. 8A. It is a schematic sectional block diagram which shows an example of the illuminating device provided with the light guide element for shelf boards of 7th embodiment which concerns on this invention. It is a schematic sectional block diagram which shows an example of the illuminating device provided with the light guide element for shelf boards of 8th embodiment which concerns on this invention. It is a schematic side view explaining the lighting condition of the illuminating device which concerns on this invention. It is a schematic side view explaining the lighting condition of the conventional illuminating device. It is a schematic side view explaining the lighting condition of the conventional illuminating device. It is a top view which shows an example of the light source formed by arranging a plurality of LED light sources densely. It is a side view of the light source shown to FIG. 13A. It is a top view which shows the other example of the light source formed by closely arranging a plurality of LED light sources. It is a side view of the light source shown to FIG. 14A. It is a schematic perspective view which shows an example of the illuminating device provided with the light guide element for shelf boards which has the light source which arranged the LED light source densely severally. It is a schematic perspective view which shows an example of the illuminating device provided with the light guide element for shelf boards which has a light source which consists of a cold cathode tube.

Embodiments of the present invention will be described below with reference to the drawings. Moreover, the same code | symbol is used about the same structural member, and detailed description is abbreviate | omitted suitably.

<First embodiment>
First, the first embodiment of the shelf light guide element according to the present invention using FIG. 1A, FIG. 1B, FIG. 2 and FIG. 3, and the illumination provided with the shelf light guide element 1A of the first embodiment The device 10A will be described. In the following description, for simplicity of explanation, the light source is described as a point light source, but a light source other than the point light source, for example, a planar light source or a linear light source may be used. As shown to FIG. 1A, 10 A of illuminating devices are set as the structure provided with the light guide element 1A for shelf boards, and the point light source 2. FIG. The shelf light guide element 1A includes an incident surface 11A on which light emitted from the point light source 2 is incident, a reflecting surface 12A that reflects incident light, and an exit surface 13A that emits reflected light. The cross section is triangular with three surfaces.

The reflection surface 12A includes a first reflection surface 12Aa having a diffusion portion 14 that totally reflects the incident light while diffusing the incident light in a predetermined angle range, and the emission surface 13A is formed of the light reflected by the first reflection surface 12Aa. A part of the light is emitted after being refracted, and the exit surface is inclined with respect to the first reflecting surface 12Aa to the extent that the remaining light is totally reflected.

The point light source 2 is, for example, an LED light source, and is a white LED light source that emits white light by combining a blue LED chip and a phosphor that is excited by light from the LED chip and emits excitation light of a predetermined wavelength. By using this, the shelf light guide element 1A can be applied as a light guide of an illumination device that emits white light. As the size of the white LED light source, for example, a size of about 0.6 mm × 1.2 mm is widely used.

In addition, the incident surface 11A of the present embodiment is inclined to such an extent that light incident substantially perpendicular to the incident surface 11A is totally reflected from the first reflecting surface 12Aa. That is, the incident surface 11A is an inclined surface on which light that is totally reflected by the reflecting surface 12 (the reflecting surface 12A and the first reflecting surface 12Aa are collectively referred to as the reflecting surface 12) is incident substantially vertically. With such a configuration, the incident light incident from the incident surface 11A enters the totally reflected light of the reflecting surface 12 at an angle close to vertical, so that the Fresnel reflection on the surface of the incident surface can be reduced and the illuminance is high. It is preferable.

The inclination angle α1 of the incident surface 11A with respect to the reflecting surface 12 is, for example, about 50 to 80 degrees from the parallel position with respect to the reflecting surface 12, preferably about 60 degrees as shown in the figure. With such a configuration, the light incident perpendicular to the incident surface 11A can be totally reflected by the reflecting surface 12, and Fresnel reflection can be suppressed. That is, since the totally reflected light of the reflecting surface 12 is incident vertically, Fresnel reflection on the surface is reduced and light can be guided with high efficiency.

The inclination angle α2 of the emission surface 13A with respect to the reflection surface 12 is preferably, for example, inclined by 1 to 30 degrees from the parallel position with respect to the reflection surface 12, and in this embodiment, is inclined about 15 degrees as shown in the figure. ing. With such a configuration, the light totally reflected by the exit surface 13A is reflected again by the reflective surface 12 and is refracted and emitted from the exit surface 13A. At this time, the angle of the light emitted from the exit surface 13A is Since the angle is close to the angle of the light emitted first, it is possible to irradiate bright light in which these lights are synthesized.

That is, since the exit surface 13A is nearly parallel to the reflecting surface 12, the light emitted from the exit surface 13A has a large amount of emitted light in a specific direction that is slightly off the critical angle and is totally reflected by the exit surface 13A. There are many. Since the exit surface 13A is inclined with respect to the reflection surface 12, the light totally reflected by the exit surface 13A has an angle that is smaller by twice the tilt angle of the exit surface 13A due to one reflection at the exit surface 13A. Then, the light is reflected by the reflection surface 12 and emitted from the emission surface 13A. Since the emitted light is emitted when slightly deviating from the critical angle, it can be emitted in a specific direction with high intensity.

That is, the inclination angle α2 of the exit surface 13A with respect to the reflection surface 12 refracts a part of the light from the reflection surface 12, totally reflects the rest, and the totally reflected light is reflected again through the reflection surface 12. Any angle may be used so long as it is refracted and emitted when it is incident. Further, the number of repetitions of reflection is not limited to two, and may be three or four, so that the inclination angle α2 may be inclined by 1 to 30 degrees with respect to the reflecting surface 12 from a parallel position.

In this embodiment, the shelf light guide element 1A is made of a translucent member (PMMA: acrylic) having a refractive index of about 1.5. Therefore, since the total reflection angle is about 42 degrees, if the inclination angle α2 is 15 degrees, light having a total reflection angle of 42 to 90 degrees is incident on the exit surface as light of 27 to 75 degrees. Then, light from 27 degrees to less than 42 degrees is emitted. The light of 42 ° to 75 ° totally reflected on the emission surface is reflected on the reflection surface to become an incident angle of 12 ° to 45 °, and almost all of the light is emitted. In addition, since it diffuses on the reflecting surface 12 (first reflecting surface 12Aa), the light having the total reflection angle remains on the exit surface 13A, but most of the light is emitted with a few round-trip reflections, so the illuminance intensity is large. There is no effect.

Thus, the illuminating device 10A including the shelf light guide element 1A and the point light source 2 is configured to efficiently emit the totally reflected light on the reflecting surface 12 (the reflecting surface 12A and the first reflecting surface 12Aa). Therefore, it is possible to illuminate a specific direction brightly without subjecting the reflecting surface 12 to an expensive process such as a dielectric mirror.

For example, as shown in FIG. 2, the light Ra from the point light source 2 toward the reflecting surface 12 is totally reflected by the reflecting surface 12, further totally reflected by the exit surface 13A, and again totally reflected by the reflecting surface 12 and emitted. Injected from the surface 13A in the direction of the arrow DA.

The light Rb from the point light source 2 toward the exit surface 13A is totally reflected by the exit surface 13A, totally reflected by the reflection surface 12, again totally reflected by the exit surface 13A, and again totally reflected by the reflection surface 12. Injected in the direction of the arrow DB from the exit surface 13A. That is, light that is reflected back and forth between the exit surface 13A and the reflection surface 12 and deviates from the total reflection angle, that is, light that is substantially reflected by the reflection surface 12 and is close to the emission angle emitted from the exit surface 13A is emitted. It becomes composition.

As described above, by setting the inclination angle α2 of the exit surface 13A to an angle close to the reflecting surface 12 (for example, 15 degrees), the exit surface 13A is emitted obliquely from the exit surface 13A and predetermined from the normal direction of the exit surface 13A. High-intensity light is emitted in the vicinity of the A direction that is inclined at an angle (for example, 45 degrees), and light that is emitted in the B direction perpendicular to the reflecting surface 12 is hardly emitted from the reflecting surface 12, so that it is not emitted. It can be configured (controlled) so that only the vicinity of the A direction of the specific direction is irradiated with high intensity.

The closer the inclination angle of the exit surface 13A is to be parallel to the reflection surface 12, the more light that is totally reflected by the reflection surface 12 is also totally reflected by the exit surface 13A, and the exit light is biased in the direction parallel to the exit surface 13A. Only the specified direction can be illuminated with high intensity.

At this time, as shown in FIG. 3, when the incident angle with respect to the exit surface is greater than 20 degrees (corresponding to the exit angle being greater than 30 degrees), the influence of chromatic dispersion becomes large. That is, there is a risk that color unevenness occurs. However, since the incident angle and exit position on the exit surface are slightly different depending on the diffusion part on the first reflecting surface, it is possible to suppress the occurrence of color unevenness without being mixed and greatly diffused, thereby reducing color unevenness. The emitted illumination light can be emitted uniformly.

FIG. 3 shows an incident angle on the exit surface in the medium of a light guide element (shelf plate light guide element) having a refractive index of 1.5 at the D line and a refractive index of only about 0.01 due to chromatic dispersion. The angle difference Δθ degrees (the maximum value of the vertical axis is about 3 °) at the emission angle in different cases is shown. As can be seen from this figure, when the incident angle exceeds 20 degrees in the medium, the angle difference of the exit angle deviates from the linearity, resulting in a large angle difference. Further, since the incident angle of 20 degrees in the medium is about 30 degrees as the exit angle, it can be understood that the influence of chromatic dispersion becomes large and color unevenness is likely to occur when the exit angle is 30 degrees or more.

When a material having a refractive index lower than 1.5 is used for the light guide element for shelf plates, the influence of chromatic dispersion is large at an angle where the incident angle in the medium is several degrees larger than 20 degrees. When a material having a higher than 1.5 is used, the influence of chromatic dispersion increases at an angle where the incident angle in the medium is several degrees smaller than 20 degrees.

The shelf light guide element 1A of the present embodiment uses a medium (PMMA) with a refractive index of 1.5, and the incident angle and the emission position on the emission surface 13A via the diffusion portion 14 provided on the first reflection surface 12Aa. Are slightly different from each other and mixed with each other, so that light with reduced color unevenness can be emitted with uniform illuminance.

For example, as shown in FIG. 1A, the light R1 emitted from the point light source 2 is diffused within a predetermined angle range by the first reflecting surface 12Aa having the diffusing portion 14, and the light rays L1a having different emission angles from the emission surface 13A. , L1b, and L1c. In addition, since the emission direction of these light beams is refracted and emitted from the emission surface 13A in a predetermined direction, it can be defined in advance in a desired direction.

For this purpose, as shown in FIG. 1B, the shelf light guide element 1A has an incident surface 11A that is long enough to allow a plurality of point light sources 2 to be juxtaposed at a predetermined interval. In the case of a long member having a reflective surface and a light exit surface 13A, the lighting device 10A is provided with the long shelf light guide element 1A and the plurality of point light sources 2 and is long in the longitudinal direction. The light emitted from the plurality of point-like light sources arranged in parallel is mixed with each other by diffusion at the first reflecting surface 12Aa, and becomes illumination light that is uniform in the longitudinal direction and illuminates a predetermined specific direction. .

Conventionally, in the configuration in which the diffusing means is disposed on the exit surface, the divergence angle of the illumination light becomes large, and a desired specific direction cannot be irradiated with high intensity. In the present embodiment, a diffusing portion is arranged on the first reflecting surface immediately before emission to achieve both irradiation in a specific direction and uniformity.

As described above, the incident surface 11A is long enough to allow a plurality of point light sources 2 to be juxtaposed at a predetermined interval, and the reflective surface 12 (12A, 12Aa) and the exit surface having the same size along the longitudinal direction. With the configuration having 13A, the plurality of point light sources 2 can illuminate widely in the longitudinal direction with high illuminance. Further, since the light from each of the point light sources 2 is diffused, the shelf light guide element that can uniformly irradiate by reducing luminance unevenness of the plurality of point light sources 2 is obtained.

It is preferable that the diffusion unit 14 is provided in a portion that reflects the reflected light toward the exit surface 13A. With this configuration, it is possible to efficiently reduce color unevenness by diffusing light toward the exit surface 13A into a predetermined angle range. Further, since the light can be guided to the diffusing portion 14 without increasing the luminous flux, the light can be guided while maintaining a high illuminance, and unevenness in brightness and color can be reduced.

That is, the first reflecting surface 12Aa including the diffusing portion 14 on the reflecting surface 12 is provided only at a position close to the emitting surface 13A, and the unevenness of color on the emitting surface 13A is not increased without unnecessarily increasing the luminous flux and the divergence angle by diffusion. In addition, the brightness unevenness of the plurality of point light sources 2 and the brightness unevenness of the illumination light beams having different numbers of reflections on the inner surface of the shelf light guide element are reduced.

The diffusion unit 14 preferably diffuses at a diffusion angle that can suppress the influence of chromatic dispersion. That is, by providing the reflective surface 12 with a rough surface that can be diffused at a predetermined small diffusion angle and small irregularities, or by attaching a diffuse reflection sheet, it is possible to uniformly mix colors and reduce color unevenness effectively. Can do. Therefore, for example, the diffusion portion 14 used here may be formed by roughening the surface of the shelf light guide element 1A, may be formed by printing diffusion dots, a diffusion film or a diffusion reflection plate It is good also as a structure which pastes.

Moreover, the LED light source used as the point light source 2 is not limited to a white LED light source using a blue LED and a yellow phosphor, and even a white LED light source using three primary colors of red, blue, and green uses an LED light source other than white. Also good.

For light that is not totally reflected by the reflecting surface 12, a reflecting member (for example, an aluminum cover) is disposed on the back surface of the reflecting surface 12, and the light reflected by the reflecting member reenters the light guide element for the shelf plate. It is preferable to configure so as to. The reflecting member may be an aluminum cover or a member that has been subjected to white reflection processing such as white paint or mirror processing on the cover, or a configuration in which mirror processing is applied to the reflecting surface 12 instead of these members. The structure which affixed the mirror film may be sufficient.

In addition, in order to make this illuminating device 10A have higher illuminance, an LED light source having high luminance may be used as the LED light source that is the point light source 2, or more LED light sources may be installed. 13A and 13B show a light source 40A that is an example of a light source 40 in which a plurality of LED light sources K1 that are white light sources are closely arranged. 13A is a top view of the light source 40A, and FIG. 13B is a side view of the light source 40A.

The LED light source K1 includes a phosphor 42 that converts blue light 43 into yellow light 44 with a predetermined conversion efficiency on a blue LED 41 having a light emission center 41a that emits blue light 43. A part of the blue light 43 is converted into yellow light 44 and the rest is emitted from the LED light source K1, so that the blue light 43 and the yellow light 44 are mixed to form white light.

The phosphor 42 is formed so as to cover the entire upper part of the blue LED 41. Therefore, when the LED light sources K1 are arranged densely as shown in FIG. 13A, the phosphor 42 portions appear to be arranged continuously even though the light emission centers 41a of the blue LEDs 41 are arranged discretely. Since white light is emitted from the phosphor 42 portion, it looks as if it is a light source having a light emitting surface extending in the direction in which the LED light sources K1 are arranged (X direction in the figure).

It can be said that such a light source is a linear light source or a linearly long surface light source (XY plane). Therefore, in the present invention, it can be said that a light source having a light emitting surface extending in a direction in which a plurality of the point light sources 2 are arranged may be used instead of the row of the point light sources 2. The smaller the length of the light source in the vertical direction (Y direction in the figure), the better. In the case of a point light source, it goes without saying that the smaller the length (size) in the vertical direction perpendicular to the arrangement direction, the better.

That is, the point light source here refers to a light source in which, for example, the vertical and horizontal sizes of the light emitting surface for emitting light in the horizontal direction are sufficiently small compared to the size of the illumination optical system. For example, in the case of providing reflective surfaces opposite to each other in the vertical direction perpendicular to the arrangement direction, the length of the point light source in that direction is sufficiently small compared to the length in the direction between the two reflective surfaces ( For example, 1/3) refers to the light source. With this size, the specific direction can be efficiently illuminated.

Other examples of the light source 40 having a light emitting surface extending in the direction in which LEDs that are point light sources are arranged include a light source 40B shown in FIGS. 14A and 14B, for example. 14A is a top view of the light source 40B, and FIG. 14B is a side view of the light source 40B. The light source 40 </ b> B includes a substrate 21, a plurality of blue LEDs 41 mounted on the substrate 21, and a phosphor 42 that covers the plurality of blue LEDs 41. A wiring pattern for supplying power to the blue LED 41 is formed on the substrate 21, one electrode of the blue LED 41 is in contact with the wiring pattern, and the other electrode is wire bonded from the wiring pattern. Has been.

Blue LED 41 is supplied with electric power and emits blue light 43 from the light emitting surface. As the blue light 43 travels through the phosphor 42, it is converted into yellow light 44 with a conversion efficiency in accordance with the characteristics of the phosphor 42. The light emitted from the phosphor 42 becomes white light by appropriately mixing the blue light 43 and the yellow light 44, and the light source 40B emits white light.

FIG. 15 shows an example of a lighting device 10A in which the light source 40 (40A, 40B) is mounted on the shelf light guide element 1A. Another example corresponding to the light source 40 is a thin-line cold cathode tube. A modification of the illuminating device 10A provided with such a light source 50 is shown in FIG. In the illumination device 10A shown in FIG. 16, a light source 50 made of a cold cathode tube is mounted on the shelf light guide element 1A.

As described above, the shelf light guide element 1A according to the present embodiment includes the first reflecting surface 12Aa that guides the incident light to the exit surface 13A while diffusing the incident light in a predetermined angle range, and the predetermined direction from the exit surface 13A. Since the light is refracted and emitted, the light distribution of the point light source 2 is controlled so that the light guide element for shelf plates can be illuminated efficiently and uniformly in a desired specific direction.

<Second embodiment>
Next, the lighting device 10B including the shelf light guide element 1B according to the second embodiment and the shelf light guide element 1B according to the second embodiment will be described with reference to FIG.

In addition to the first reflecting surface 12Ba corresponding to the reflecting surface 12 described above as the reflecting surface, the shelf-plate light guide element 1B faces the first reflecting surface 12Ba substantially in parallel and transmits light from the first reflecting surface 12Ba. It is an example which has 2nd reflective surface 12Bb which receives and reflects toward 1st reflective surface 12Ba.

With such a configuration, it is possible to irradiate a position away from the point light source 2 by repeatedly reflecting between the first reflecting surface 12Ba and the second reflecting surface 12Bb. Further, since the second reflecting surface 12Bb is substantially parallel to the first reflecting surface 12Ba, the light totally reflected by the first reflecting surface 12Ba is also totally reflected by the second reflecting surface 12Bb and becomes highly efficient reflection. Further, since the optical path length from the light source to the exit surface 13B is increased, the interval between the point light sources 2 arranged side by side can be increased, and the number of the point light sources 2 can be reduced.

At this time, it is preferable that the diffusing portion 14 provided on the first reflecting surface 12Ba is provided near the exit surface 13B so that the luminous flux and the divergence angle are not increased unnecessarily by diffusion. Since the luminous flux and the divergence angle are not increased, light can be efficiently guided using total reflection without increasing the size. In addition, a reflection member similar to that described above is provided on the back surfaces of the first reflection surface 12Ba and the second reflection surface 12Bb, and all light that is not totally reflected by the respective reflection surfaces is re-entered into the shelf light guide element. I am doing so.

Since the second reflecting surface 12Bb is substantially parallel to the first reflecting surface 12Ba, most of the light reflected by the second reflecting surface 12Bb is guided to the first reflecting surface 12Ba and then guided to the exit surface 13B to be emitted. . Further, the light that is reflected directly from the incident surface 11B or reflected by the second reflecting surface 12Bb and guided to the exit surface 13B makes the exit surface 13B at an angle close to parallel to the first reflecting surface 12Ba and the second reflecting surface 12Bb. By inclining, the number of times of total reflection at the exit surface 13B and reflection toward the exit surface 13B at the first reflective surface 12Ba is repeated once (light Rc shown by a dotted line in the drawing) or a plurality of times. The light exits sequentially from the exit surface 13B that deviates from the total reflection angle.

That is, by setting the inclination angle of the exit surface 13B to an angle close to parallel to the first reflecting surface 12Ba (for example, 15 degrees), the exit surface 13B is ejected obliquely from the exit surface 13B, and a predetermined angle from the normal of the exit surface 13B. High-intensity light is emitted in the vicinity of the direction of arrow A in the drawing (for example, 45 degrees), and the light emitted in the direction of arrow B in the drawing perpendicular to the first reflection surface 12Ba is emitted from the first reflection surface 12Ba. Since it is hardly guided, it is not emitted, and it can be controlled so that only the vicinity of the A direction in a specific direction is irradiated with high intensity.

In addition, light having a different number of reflections between the second reflection surface 12Bb and the first reflection surface 12Ba is mixed with each other because the incident angle and the emission position on the emission surface 13B are slightly different depending on the diffusion portion 14 on the first reflection surface 12Ba. And can be injected uniformly without large diffusion.

Even in the shelf light guide element 1B having the above-described configuration, the light reflected by the first reflecting surface 12Ba having the diffusing portion 14 that totally reflects the incident light within a predetermined angle range is emitted from the emission surface 13B. Therefore, the light guide element for a shelf plate can be illuminated efficiently and uniformly in a desired specific direction by controlling the light distribution of the point light source.

Therefore, the illuminating device 10B provided with the shelf light guide element 1B and the point light source 2 can control the light distribution of the point light source 2 to illuminate efficiently and uniformly in a desired specific direction. .

<Third, fourth and fifth embodiments>
Next, referring to FIGS. 5, 6, and 7, the shelf light guide element 1 </ b> C of the third embodiment, the shelf light guide element 1 </ b> D of the fourth embodiment, and the shelf board of the fifth embodiment, respectively. The light guide element 1E and an illumination device including these will be described.

The shelf light guide element 1C of the third embodiment shown in FIG. 5 is a first reflection in which a diffusion portion is provided on the entire surface in place of the first reflection surface 12Ba provided in the shelf light guide element 1B of the second embodiment. An example provided with surface 12Ca is shown. In the present embodiment, the diffusing portion 14A is formed of diffusing dots by printing.

Since the diffusing portion 14A composed of diffusing dots can be controlled to a smaller diffusing angle, the divergence angle from the light beam and the exit surface is not increased unnecessarily, and a specific direction (for example, the arrow direction shown in the figure). Can be injected. In this example, since diffusion dots are provided on the side close to the incident surface 11C, the emitted light may have a slightly larger divergence angle. However, irradiation control in a specific direction can be performed by refraction at the emission surface 13C. Is possible.

At this time, if the light from the point light source 2 incident from the incident surface 11C can be entirely guided to the exit surface 13C via the first reflecting surface 12Ca and the second reflecting surface 12Cb, the incident surface 11C is inclined like the incident surface 11B of the shelf light guide element 1B of the second embodiment, even if the inclined surface is similar to the incident surface 11A of the first embodiment as shown in the figure. Instead, it may be a surface in a direction orthogonal to the first reflecting surface.

Further, by setting the inclination angle of the exit surface 13C to an angle close to parallel to the first reflecting surface 12Ca, the arrow in the figure is emitted in an oblique direction from the exit surface 13C and inclined by a predetermined angle from the normal line of the exit surface 13C. It is the same that high-intensity light is emitted near the direction. Therefore, even this shelf light guide element 1C is a shelf light guide element that guides all incident light to the exit surface 13C while diffusing the incident light in a predetermined angle range and emits the light from the exit surface 13C in a specific direction. Since there is no change, light distribution control of the light from the point light source provides a shelf light guide element that can illuminate efficiently and uniformly in a desired specific direction.

The shelf light guide element 1D of the fourth embodiment shown in FIG. 6 is different from the shelf light guide element 1C of the third embodiment in that it is diffusely reflected using an aluminum cover 15. The configuration is the same, and includes an incident surface 11D on which the light from the point light source 2 is incident, a first reflecting surface 12Da, a second reflecting surface 12Db, and an exit surface 13D.

The aluminum cover 15 includes a reflecting surface 15a having a diffuse reflecting function, and the reflecting surface 15a diffuses and reflects light that is not totally reflected by the first reflecting surface 12Da, and then enters the shelf light guide element 1D again. Let That is, the aluminum cover 15 provided with the reflection surface 15a having the diffuse reflection function forms the diffusion portion 14B.

Even in such a configuration, it is possible to reflect all of incident light while diffusing it within a predetermined angle range and guide it to the exit surface 13D. Therefore, even the shelf light guide element 1D of the fourth embodiment is still a shelf light guide element that emits all incident light from the exit surface while diffusing the incident light in a predetermined angle range. Therefore, the light guide element for a shelf plate that can control the light distribution of the point light source to illuminate efficiently and uniformly in a desired specific direction.

The shelf light guide element 1E according to the fifth embodiment shown in FIG. 7 is a diffusion part made of diffusion dots on the second reflecting surface, instead of the diffusion part 14A provided in the shelf light guide element 1C according to the third embodiment. The other configuration is the same except that 14C is provided. That is, it includes an incident surface 11E on which the light from the point light source 2 is incident, a first reflective surface 12Ea, a second reflective surface 12Eb, and an exit surface 13E.

Since the second reflecting surface 12Eb includes the diffusing portion 14C, the light diffused by the diffusing portion 14C at a predetermined small angle is reflected toward the first reflecting surface 12Ea, and is emitted from the first reflecting surface 12Ea to the exit surface 13E. Led to.

Even in the shelf light guide element 1E having such a configuration, it is the same that all incident light is reflected while being diffused within a predetermined angle range and guided to the exit surface. Therefore, the shelf light guide element 1E according to the fifth embodiment is a shelf light guide element that emits all incident light from the exit surface 13E while diffusing the incident light in a predetermined angle range. The light distribution element for the shelf plate can be illuminated efficiently and uniformly in a desired specific direction by controlling the light distribution.

Therefore, both the lighting device 10C provided with the shelf light guide element 1C and the point light source 2 and the illumination device 10D provided with the shelf light guide element 1D and the point light source 2 are used as the shelf light guide element 1E. The illumination device 10E provided with the point light source 2 can also illuminate efficiently and uniformly in a desired specific direction by controlling the light distribution of the light from the point light source 2, respectively.

<Sixth embodiment>
Next, a sixth embodiment will be described with reference to FIGS. 8A and 8B. This embodiment includes a first shelf light guide element 1Aa and a second shelf light guide element 1Ab, and transmits light from one point light source 2 via a pair of shelf light guide elements. An example in which light is guided in two different directions is shown.

That is, as shown in the cross-sectional view of FIG. 8A, the shelf light guide element 1F is a configuration in which the first shelf light guide element 1Aa and the second shelf light guide element 1Ab are combined vertically. The illuminating device 10F provided with the shelf light guide element 1F has a configuration in which the point light sources 2 are arranged at the abutting portions of the pair of shelf light guide elements. Moreover, as shown to FIG. 8B, it is the elongate illuminating device 10F which makes the longitudinal direction the direction which arranges the point light source 2 in parallel with predetermined spacing.

The incident surface 11Aa of the first shelf light guide element 1Aa and the incident surface 11Ab of the second shelf light guide element 1Ab intersect at a predetermined angle. The light received from the point light source 2 is branched in two different directions. In addition, since light incident from each incident surface is reflected back and forth between the reflecting surface and the exit surface, and light deviating from the total reflection angle is emitted, it is possible to illuminate two different specific directions with high illuminance. .

As described above, the shelf light guide element 1F including the first shelf light guide element 1Aa and the second shelf light guide element 1Ab transmits light emitted from one LED light source in two different directions. Since the light can be guided and the two different directions can be illuminated brightly and efficiently uniformly, the illumination device 10F receives light from the plurality of point light sources 2 and can illuminate widely in the longitudinal direction with high illuminance. Further, since the light from each point light source 2 is diffused and emitted in a predetermined direction, two different specific directions can be illuminated uniformly.

Further, when combining one or two shelf light guide elements, the above shelf light guide elements 1B to 1E may be combined in place of the shelf light guide element 1A. Can be used in appropriate combination. Furthermore, it replaces with a pair of two, and can also use the integrated light guide element for shelf boards of the shape which combined the pair of two.

Next, an embodiment using an integrated shelf light guide element having a shape in which a pair of two is combined will be described with reference to FIG.

<Seventh embodiment>
The shelf light guide element 1G of the seventh embodiment shown in FIG. 9 has a T-shaped cross section integrally including an incident portion 1Ga having an incident surface 11G, a first light guide portion 1Gb, and a second light guide portion 1Gc. It is a light guide element for shelf boards, Comprising: The light which the point light source 2 inject | emits via the 1st incident surface 11Ga and the 2nd incident surface 11Gb which form the incident surface 11G and 1st light guide part 1Gb and 2nd The light is branched and guided to the light guide portion 1Gc.

That is, the shelf light guide element 1G mounted on the front end of the shelf plate 5 using the attachment member 6 is a point light source 2 mounted on the front end of the shelf plate 5 (a chip-type light source in which an LED light source is mounted on the substrate 21). The light from the light source is split into a light beam L1 emitted in a specific direction on the upper side of the shelf board 5 and a light beam L2 emitted in a specific direction on the lower side of the shelf board 5 and emitted.

As described above, the illumination device 10G in which the point light source 2 and the shelf light guide element 1G are disposed at the tip of the shelf plate 5 can simultaneously illuminate the specific directions above and below the shelf plate 5. Therefore, by using the lighting device 10G having a long shape including a plurality of point light sources 2 along the shelf 5 of the showcase, it becomes possible to efficiently and uniformly illuminate products displayed in the showcase. .

Here, 15A and 15B are aluminum covers having a diffuse reflection function, for example, and reflect toward the inside of the shelf light guide element 1G without emitting light except in a desired specific direction. And a function of diffusing in a predetermined angle range when reflecting. In particular, the diffuser 14 is provided near the exit surface of the cover 15A, and the reflected light diffused in a predetermined angle range is reflected toward the upper exit surface 13Ga, thereby suppressing color unevenness and illumination unevenness. It becomes possible.

The light emitted from the point light source 2 and incident on the intersecting incident surfaces 11Ga and 11Gb is all emitted toward the first light guide 1Gb and emitted from the emission surface 13Ga, and the light directed toward the second light guide 1Gc All are ejected from the exit surface 13Gb.

As described above, the lighting device 10G using the shelf light guide element 1G that branches and guides the light emitted from the point light source 2 in two different directions simultaneously illuminates a specific direction above and below the shelf. Therefore, the lighting device can efficiently and uniformly illuminate products displayed in the showcase.

<Eighth embodiment>
The eighth embodiment shown in FIG. 10 shows an example in which a branching portion for branching the light emitted from the point light source 2 is provided on the back side of the shelf light guide element facing the point light source 2. The shelf light guide element 1H of the eighth embodiment has a T-shaped cross section because it directly receives the light emitted from the point light source 2 and branches in two different directions at a branching portion 11H provided on the back surface side. There is no need, and a plate shape as shown in the figure may be used.

That is, it is a plate-like light guide element 1H for a shelf board that is long in the direction perpendicular to the paper surface, and includes a V-groove branching portion 11H that branches the light emitted from the point light source 2. The branch portion 11H has a V shape in which the first branch surface 11Ha and the second branch surface 11Hb intersect at a predetermined angle, and the light reflected by the first branch surface 11Ha is first emitted through the first light guide portion 1Hb. The light guided to the surface 13Ha and reflected by the second branch surface 11Hb is guided to the second exit surface 13Hb via the second light guide 1Hc.

The first exit surface 13Ha is inclined at a predetermined angle (for example, 10 to 30 degrees) with respect to the first reflective surface 12H, and emits a light beam L1 directed in a specific direction, like the exit surfaces 13A and 13B described above. As illustrated, the second emission surface 13Hb may be provided on a plate-like lower surface. In this case, the light beam L2 and the shelf plate that are emitted toward the shelf plate on the lower side of the shelf light guide element 1H. As shown by the light beam L3 emitted in a direction away from the light source, a wide range below the shelf light guide element 1H is illuminated.

That is, the lighting device 10H having a configuration in which the substrate 21 on which the point light source 2 is mounted, the shelf light guide element 1H, and the reflection member 15C are attached via the holder 7 attached to the tip of the shelf 5A and the stay 7A. Illumination light (L1) directed obliquely upward of the shelf plate 5A to which the plate light guide element 1H is attached and illumination light (L2 + L3) that illuminates a wide range below the shelf plate 5A are emitted. Further, the reflection plate 12Hb may be attached to a predetermined portion of the shelf light guide element 1H including the surface facing the substrate 21.

For this purpose, the object surface of the product M placed on the shelf board 5A is effectively illuminated by the illumination light directed obliquely upward, and the shelf board 5A is illuminated by the illumination light that illuminates the wide range below the shelf board 5A. The upper part of the product placed on the lower shelf board is effectively illuminated. That is, by providing the lighting device 10H according to this embodiment on a plurality of shelf boards, it is possible to illuminate an object on the shelf board from above and below.

The illuminating devices 10A to 10H provided with the shelf light guide elements 1A to 1H according to the present embodiment described above are diffused so as to reduce color unevenness and luminance unevenness and led to the exit surface, and the total reflection angle from the exit surface Since the light deviated from the light is refracted and emitted in the oblique direction, the light distribution is controlled in a predetermined specific direction, and the oblique specific direction can be illuminated efficiently and uniformly.

For that purpose, as shown in FIG. 11, the shelf light guide elements 1 (1A to 1H) are attached to the shelf plate 5B on which tall products M1 such as milk packs and juice packs are placed, and then directed in a specific direction. An illuminating device that uniformly emits the light beams L1a, L1b, and L1c can be realized.

In the conventional illumination device, since it is diffused on the exit surface, it is greatly scattered on the exit surface, and it is difficult to control the exit in a specific direction, and luminance unevenness in the illumination area is also large. Moreover, if it is not diffused, the illumination uniformity is impaired due to color unevenness due to color dispersion on the exit surface, luminance unevenness due to emitted light having different number of reflections, and brightness unevenness of a plurality of point light sources.

Also, in the case of diffusing by mixing a diffusing agent or fine particles into the material of the light guide element for shelf plate, as in the case where the diffusing means is provided on the exit surface, it is greatly scattered and it becomes difficult to control the injection in a specific direction.

For example, as shown in FIG. 12A, in the illumination using the conventional shelf light guide element 1X diffusing on the exit surface, the light irradiated to the tall product M1 placed on the shelf 5B As shown in the figure, DX scatters in a wide range above and below, and its light intensity varies. Therefore, it is difficult to uniformly illuminate the surface of the product and it is difficult to identify the product. Moreover, since it becomes impossible to give a purchaser a sense of reliability and security, it is not preferable.

As shown in FIG. 12B, in the illumination using the shelf light guide element 1 </ b> Y configured to emit from the upper surface in order to illuminate the upper portion of the tall product, the upper portion of the product M <b> 1. Since the portion is illuminated with light DY that is greatly scattered, it is difficult to uniformly illuminate the desired display label portion, which is not preferable for the purchaser.

On the other hand, according to this embodiment, it is possible to illuminate by controlling the light distribution in a specific direction by total reflection of the shelf light guide element, diffusion in a predetermined angle range, and oblique refraction at the exit surface. The shelf light guide element and the illumination device can illuminate a desired specific direction brightly, efficiently and uniformly.

In addition, although it was set as the embodiment using a chip-type LED light source as a point light source, other point light sources may be used, for example, a lens-attached or bullet-type LED light source may be used.

As described above, according to the light guide element for shelves according to the present invention, it is possible to effectively illuminate a specific direction at a position different from the point light source. In addition, since light is emitted in an oblique direction from an exit surface that is nearly parallel to the reflective surface, light is emitted with high intensity in a specific direction, and color unevenness due to color dispersion on the exit surface is reduced through a diffusion unit provided in the first reflective surface. Irradiation with a uniform color is possible. Furthermore, since the light reflected with high efficiency using the total reflection light is refracted from the exit surface and emitted, the shelf that can control the light distribution of the point light source to illuminate efficiently and uniformly in the desired specific direction. A light guide element for a plate can be obtained.

Further, according to the lighting device according to the present invention, it is possible to obtain a lighting device capable of illuminating efficiently and uniformly in a desired specific direction by controlling the light distribution of the point light source.

Therefore, the light guide element for a shelf and the lighting device according to the present invention are used as a lighting device for illuminating a tall product placed on the shelf of a multistage showcase having a plurality of shelf plates above and below. It can be suitably applied.

1A to 1H Shelf light guide element 2 Point light source (light source, LED light source)
5, 5A, 5B Shelf plate 10A to 10H Illuminating device 11, 11A to 11H Incident surface 12 Reflecting surface 12Aa to 12Ha First reflecting surface 12Ab to 12Hb Second reflecting surface 13A to 13H Ejecting surface 14, 14A to 14C Diffusion unit

Claims (15)

  1. A light guide element including an incident surface on which light emitted from a light source is incident, a reflective surface that reflects incident light, and an emission surface that emits reflected light,
    The reflective surface includes a first reflective surface that totally reflects incident light;
    The exit surface is an exit surface that is inclined with respect to the first reflection surface so as to refract part of the light totally reflected by the first reflection surface and emit the remaining light and totally reflect the remaining light. The maximum intensity of light is emitted in a direction inclined with respect to the normal direction of the exit surface,
    The first reflecting surface includes a diffusing portion that totally reflects while diffusing incident light in a predetermined angle range,
    A light guide element for a shelf board, which is installed along the front end of the shelf board and illuminates at least one of the upper and lower sides of the shelf board.
  2. The shelf light guide element according to claim 1, wherein the diffusion unit diffuses at a diffusion angle capable of suppressing occurrence of color unevenness.
  3. The light guide element for shelf boards according to claim 1 or 2, wherein the maximum intensity light of the emitted light is emitted in a direction inclined at an angle larger than 30 degrees with respect to the normal direction of the emission surface.
  4. The shelf light guide element according to any one of claims 1 to 3, wherein the exit surface is inclined by 1 to 30 degrees from a parallel position with respect to the first reflecting surface.
  5. 5. The incident surface according to claim 1, wherein the incident surface is inclined so that light incident substantially perpendicular to the incident surface is totally reflected from the first reflecting surface. Shelf light guide element.
  6. The shelf light guide element according to claim 5, wherein the incident surface is inclined by 50 to 80 degrees from a parallel position with respect to the first reflecting surface.
  7. 7. The incident surface is long enough to allow a plurality of the point light sources to be arranged in parallel at a predetermined interval, and has a reflective surface and an emission surface of the same size along the longitudinal direction. The light guide element for shelf boards in any one of.
  8. The reflective surface includes a second reflective surface that faces the first reflective surface substantially in parallel and receives light from the first reflective surface and reflects the light toward the first reflective surface. The light guide element for shelf boards in any one of 1-7.
  9. The shelf light guide element according to any one of claims 1 to 8, wherein the diffusing portion is provided in a portion that reflects reflected light toward the exit surface.
  10. An illumination device comprising: a light source; an incident surface on which light emitted from the light source is incident; a reflection surface that reflects incident light; and a light guide element that includes an emission surface that emits reflected light. There,
    An illumination device comprising the shelf light guide element according to claim 1 as the light guide element.
  11. The shelf light guide element includes a pair of shelf light guide elements having first and second shelf light guide elements, and guides light emitted from one light source in two different directions. The lighting device according to claim 10.
  12. The shelf light guide element is an integrated type having a branching portion that branches light emitted from the light source in two different directions, and guides light emitted from one light source in two different directions. It has a 2nd light guide part, The illuminating device of Claim 10 characterized by the above-mentioned.
  13. The lighting device according to claim 10, wherein the light source is a point light source.
  14. The lighting device according to claim 13, wherein the point light source is an LED light source.
  15. A plurality of the light sources are arranged side by side at a predetermined interval, and have a long incident surface, a reflection surface, and an emission surface along a longitudinal direction in which the light sources are arranged side by side, and are installed along the front end portion of the shelf board. The lighting device according to claim 10.
PCT/JP2012/050894 2011-02-04 2012-01-18 Shelf-use light guide element and lighting device WO2012105315A1 (en)

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JP2011-023394 2011-02-04

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