JP5794295B2 - Lighting device, shelf unit, and showcase - Google Patents

Description

  The present invention relates to an illuminating device, a shelf illuminating device, and a showcase provided with the shelf illuminating device, for example, an illuminating device suitable for illuminating a product arranged in a showcase and displayed in the showcase, and A shelf illuminating device suitable for illuminating a product displayed on the shelf and disposed in a showcase having a price rail at the tip of the shelf, and a shelf unit and the showcase provided with the shelf illuminating device About.

  2. Description of the Related Art Conventionally, fluorescent lamps have been widely used to illuminate products placed in a showcase and displayed on the showcase. 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.

  2. Description of the Related Art In recent years, lighting devices using LEDs (Light Emitting Diodes), which have long life and low power consumption and are environmentally friendly, have been put into practical use along with improvement in luminous efficiency and increase in light emission amount. 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.

  For this purpose, an LED illumination device provided with this white LED light source is used as the illumination device. In particular, as an illumination device for display shelves such as showcases, it is sought to use LED light sources that consume less power and generate less heat. For example, it is arranged at the end of a shelf board to illuminate products displayed on the shelf. A showcase provided with LED lighting has already been proposed (see, for example, Patent Document 1).

  In the showcase described in Patent Document 1, a guard installed to prevent the product from falling is composed of a translucent plate material, and light from the LED lighting device is directed from the upper end of the guard to the product on the shelf. Irradiating.

  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

  The lighting device for the shelf board is desired to have uniform illumination with no illuminance unevenness on the product. When an LED, which is a point light source, is used as the light source, in order to achieve uniform illumination, an optical optical path length is ensured according to the LED arrangement pitch and directivity angle (light distribution angle), and the exit surface of the illumination device It is desirable that the illuminance at is uniform.

  However, when a light guide made of a translucent plate is used as in the showcase described in Patent Document 1, the optical path is filled with a medium, and a plane serving as a refractive surface is disposed in the vicinity of the light source. Therefore, when the incident surface is flat, the light distribution angle is apparently reduced in the medium due to refraction at the incident surface, and the light path is made hollow in order to make the luminance uniform in the LED array direction. Must be secured longer than

  Therefore, when using an illuminating device that is disposed at the front end of the shelf plate and has a light guide path in the vertical direction of the shelf plate, the light guide optical path, that is, the vertical width of the illumination device must be widened. Thus, if a lighting device having a wide vertical width is disposed at the front end of the shelf board, the lower part of the product displayed on the shelf is hidden, which is not preferable because the product purchaser observes the product.

  In addition, a shelf illuminator that can easily control light distribution so that an appropriate range can be effectively illuminated according to the size of the products displayed on the shelf is preferable. A shelf illuminator that can effectively illuminate is desirable.

  That is, in the showcase described in Patent Document 1, since the guard is made of a light-transmitting plate material and the light emitted from the LED light source is irradiated toward the product on the shelf through the guard, the emitted light is large. Scattering and darkening cause a problem that illumination cannot be performed uniformly and efficiently. In addition, when a product having a surface with low diffusibility and easily reflected is illuminated, there arises a problem that the light source of the point light source is reflected and the viewer becomes dazzled, and the product looks bad.

  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 order to reduce cost and improve design, it is preferable to use a lighting device having a compact configuration that can diffuse light emitted from a point light source in a predetermined range and efficiently guide light in a desired direction.

  The present invention has been made in view of the above circumstances, and can control light distribution from a plurality of point-like light sources to illuminate efficiently and uniformly in a desired specific direction, and the light sources are uniform. In the shelf lighting device used for showcases with shelf boards, it is possible to reduce the size of the shelf lighting device, which is effective for lighting that is not dazzling even when reflected in the product and does not deteriorate the appearance of the product. An object of the present invention is to provide a shelf illuminating device capable of effectively illuminating.

  In order to achieve the above object, the present invention has a plurality of point light sources arranged at predetermined intervals, guides light emitted from the point light sources to an emission part via a light guide path, and An illumination device that emits illumination light from an emission unit, wherein the light guide path is formed of a first reflection surface and a second reflection surface that are arranged to face each other, and corresponds to an arrangement pitch of the point light sources. An anisotropic diffusing unit is provided at a predetermined part separated by a predetermined optical path length, and light beams diffused by a predetermined angle in a predetermined direction after light beams of predetermined intensity portions of light emitted from the adjacent point light sources overlap each other. It is characterized by injection.

  According to the above configuration, after the luminous fluxes of adjacent point light sources overlap each other, the light is further diffused and emitted in a predetermined direction, so that it can be emitted as uniform illumination light. For this reason, the light from the point light source can be controlled to distribute light in a desired specific direction, and it can be illuminated efficiently and uniformly, and even if the light source is uniform and reflected in the product, it will not be dazzling and will not deteriorate the appearance of the product. It is possible to obtain an illuminating device that can perform appropriate illumination.

  In the illumination device having the above structure according to the present invention, the emission portion is an emission surface formed of a light-transmitting member. According to this configuration, the light guide path from the point light source to the emission part can be sealed with the first reflection surface, the second reflection surface, and the emission surface.

  Further, the present invention is characterized in that, in the illumination device configured as described above, the anisotropic diffusion section has a larger diffusion characteristic in a longitudinal direction in which the point light sources are arranged. According to this structure, uniform illumination light can be emitted from the discretely arranged point light sources by efficiently dispersing the light emitted from the plurality of point light sources discretely arranged at predetermined intervals. it can.

  In the illumination device having the above-described configuration, the optical path length from the point light source to the anisotropic diffusion unit is set so that light having an intensity of 30% or more from adjacent light sources overlaps. It is characterized by having. According to this configuration, since the light beams from the adjacent point light sources on the diffusing portion overlap, it is possible to obtain a light source that suppresses uneven brightness on the exit surface.

  According to the present invention, in the illumination device having the above configuration, the shortest optical path length from the point light source to the anisotropic diffusion portion is L1, the arrangement pitch of the point light sources is P, and the pointing angle of the point light source is When the half-value width is θ1, L1> P / 2 tan θ1 (Equation 1) is satisfied. According to this configuration, by securing the shortest optical path that satisfies this conditional expression, light with an intensity of 1/2 from adjacent point light sources becomes light that is mixed and mixed, and luminance unevenness on the exit surface is suppressed. The brightness can be made substantially constant.

  According to the present invention, in the illumination device having the above structure, the anisotropic diffusion portion is provided on the exit surface. According to this configuration, by providing the diffusing portion on the surface farthest from the light source, it is possible to secure the maximum optical path length from the light source to the diffusing portion, and to realize a lighting device capable of more compact and uniform illumination. it can.

  According to the present invention, in the illuminating device having the above-described configuration, the second reflecting surface is a reflecting surface on a side that reflects light emitted from the point light source toward the emitting portion, and the anisotropic surface is reflected on the second reflecting surface. It is characterized by providing a sex diffusion part. According to this configuration, since the diffusing part is provided on the reflecting surface that guides the light beam toward the emitting part, the diffusing part can be guided to the emitting part while diffusing in a predetermined angle range, and even if the diffusing part is not provided in the emitting part, An illumination device capable of uniform illumination can be realized.

  According to the present invention, in the illumination device configured as described above, the anisotropic diffusion portion is provided in a portion of the second reflecting surface facing the emission portion. According to this configuration, since the light is repeatedly diffused and not reflected, the divergence angle is not increased unnecessarily, and the uneven brightness of the plurality of point light sources is reduced, thereby enabling uniform illumination.

  Further, the present invention is characterized in that the shortest optical path length L1 reaching the anisotropic diffusing portion is about the arrangement pitch P of the point light sources in the illumination device having the above configuration. According to this configuration, since the diffusing portion is disposed at a distance approximately equal to the arrangement pitch of the point light sources, the diffusing effect can be exhibited while being sufficiently small without increasing the size of the lighting device.

  In the illumination device having the above-described configuration, the second reflecting surface is installed so that the light beam reflected by the reflecting surface is superimposed on the light beam that is directly guided from the point light source to the emitting unit. It is characterized by. According to this configuration, an illuminating device that can illuminate a specific direction with high intensity can be obtained.

  In the illumination device having the above-described configuration, the light guide path includes a first light guide path and a second light guide path that branch and guide light from the point light source in two different directions, Each light guide path is provided with the first and second reflection surfaces and the exit surface. According to this structure, the illuminating device which can illuminate uniformly in two different directions (for example, the upper and lower sides of a shelf board) simultaneously can be obtained.

  According to the present invention, in the illumination device having the above-described configuration, the light guide path is configured by a light guide element having a refractive index greater than 1, an incident surface on which light emitted from the point light source is incident on the light guide element, and a light flux And an opposite reflecting surface for guiding the light beam incident on the incident surface to the exit surface, and the anisotropic diffusion portion is provided on at least one of the exit surface or the reflective surface. It is characterized by providing. According to this configuration, since the light guide path is formed by the light guide element, the light guide path becomes longer as compared to the case where the light guide path is formed using a hollow air layer. It can illuminate and is suitable as an illumination device for a shelf board having a large vertical width.

  According to the present invention, in the illumination device having the above-described configuration, a front end of a shelf plate that has a long reflective surface and an emission surface along a longitudinal direction in which a plurality of the point light sources are arranged in parallel at a predetermined interval, and displays articles. It is characterized by being installed along the section and being inclined toward the product displayed on the shelf board. According to this configuration, the product displayed on the shelf plate can be efficiently and uniformly illuminated, and the illumination device can be easily observed by the observer.

  Further, the present invention is characterized in that, in the illumination device having the above-described configuration, the shelf board is mounted on each shelf board of a showcase having a plurality of stages, and the upper and lower sides of the shelf board are illuminated simultaneously. 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 that can efficiently and uniformly illuminate the products displayed on the showcase is obtained.

  The present invention is also a shelf illuminating device for use in a showcase having a shelf board, wherein a plurality of point light sources arranged at intervals in the longitudinal direction of the shelf board, and the light emitted from the light source is An illumination optical system including a light guide path that guides light in a direction orthogonal to the longitudinal direction and an emission unit that emits the guided light in a predetermined direction, the light guide path sandwiching an air layer The first and second reflecting surfaces are opposed to each other, the exit portion is composed of a cap member having an entrance surface and an exit surface, and light beams from adjacent light sources of the point light source are mutually located at the position of the exit surface. It is characterized by overlapping.

  According to said structure, since the light beam from an adjacent point light source overlaps with respect to the longitudinal direction of a shelf at the position of the exit surface of a cap member, uniform illumination with respect to a longitudinal direction is attained. . Further, since the air layer is used as the light guide path, the light from the point light source is mixed with a short optical path length, and the mixed light is emitted from the cap member in a predetermined direction. Therefore, it is possible to obtain a shelf lighting device that can be made compact and can effectively illuminate a predetermined range.

In the shelf illuminating device having the above-described configuration, the shortest optical path length from the point light source to the incident surface is L1, the arrangement pitch of the point light sources is P, and the pointing angle half of the point light source is half. When the value range is θ1,
L1> P / 2 tan θ1 (Formula 1)
It is characterized by satisfying. According to this configuration, the optical path length from the point light source to the emission part is not less than the length corresponding to the half width of the directivity angle at which the intensity of the light emitted from the point light source arranged at the arrangement pitch P is ½. Therefore, the light having an intensity of ½ from the adjacent point light sources becomes light that is mixed and mixed, and the illumination light whose light intensity is approximately the same level can be emitted.

  In the shelf illuminating device having the above-described configuration, the angle θ2 formed by the direction guided through the light guide path and the perpendicular of the exit surface is set to be larger than the Brewster angle. It is said. According to this configuration, by tilting the cap member at an angle equal to or greater than the Brewster angle, the reflective surface height on the viewer side of the first and second reflective surfaces facing each other is made higher than the reflective surface height on the product side. Thus, the light emitted from the cap member on the viewer-side reflecting surface is emitted toward the product side. In addition, the light beam that hits the product-side reflecting surface and the light that directly enters the cap member without hitting the reflecting surface enters the exit surface at an angle larger than the Brewster angle. The illumination light emitted to the viewer can be made larger than the illumination light emitted to the viewer side, not only can the product be illuminated efficiently, but also the glare when the viewer observes the product Can do.

  In the shelf illuminating device having the above-described configuration, the angle θ3 formed by the direction guided through the light guide path and the perpendicular of the incident surface is set to be larger than the angle θ2. It is a feature. According to this configuration, the cap member is formed in a wedge shape in which the angle of the entrance surface and the angle of the exit surface are different, and the light distribution center of the guided light is directed upward (position where the height from the shelf is high) on the product side. The front of the product on the shelf can be illuminated extensively.

  In the shelf illuminating device having the above-described configuration, an angle θ3 formed by a direction guided through the light guide path and a perpendicular to the incident surface is set to be smaller than the angle θ2, and the cap The member has a third surface in addition to the entrance surface and the exit surface, and light incident from the entrance surface is totally reflected by the exit surface and travels toward the third surface, and the third surface. After the light is reflected by the reflecting portion provided on the side, the light is emitted from the emission surface. According to this configuration, the light distribution center of the guided light can be directed to a low position on the product side using the cap member having the entrance surface, the exit surface, and the third surface, and the shelf on the shelf is short. The product can be illuminated efficiently.

  According to the present invention, in the shelf lighting device having the above-described configuration, a diffusion portion having a predetermined diffusion characteristic is provided on the exit surface. According to this configuration, by providing the diffusing portion on the surface farthest from the light source, the optical path length from the light source to the diffusing portion can be ensured to the maximum, and even if discretely arranged point light sources are used, the size is small. Nevertheless, a lighting device with uniform brightness can be realized.

  According to the present invention, in the shelf illuminating device having the above configuration, a diffusion portion having a predetermined diffusion characteristic is provided on the incident surface. According to this configuration, the exit surface, which is the outer surface, is a flat surface, and the entrance surface is formed as a diffusing surface so that the diffusing portion is provided. In addition, by providing a diffusing portion on the incident surface arranged in the vicinity of the exit surface, it is possible to realize a small but uniform illumination device even when using discretely arranged point light sources. it can.

  According to the present invention, in the shelf illuminating device having the above-described configuration, a diffusion portion having a predetermined diffusion characteristic is provided on the second reflection surface far from the shelf. According to this configuration, the light distribution is controlled by refraction on each surface of the cap member after the luminance unevenness in the arrangement direction of the point light sources by diffusing while guiding the light through the second reflecting surface. It is possible to realize an illuminating device that can uniformly illuminate a product with uniform brightness in the arrangement direction of the light sources.

  According to the present invention, in the shelf lighting device having the above-described configuration, a diffusion portion having a predetermined diffusion characteristic is provided on the third surface. According to this configuration, by making the entrance surface and the exit surface flat, it is possible to realize an illumination device that can control light distribution as illumination light with uniform brightness after efficiently guiding illumination light to the third surface. Can do.

  In the shelf illuminating device having the above configuration according to the present invention, the diffusion characteristic is characterized in that the diffusivity in the point light source array direction is larger than the diffusivity in a direction orthogonal to the point light source array direction. Yes. According to this configuration, the light diffuses greatly in the direction in which the plurality of point light sources are arranged, and even when the point light sources arranged discretely are used, luminance unevenness caused by the discrete arrangement is reduced and the luminance is reduced. A uniform lighting device can be realized.

  In the shelf illuminating device having the above configuration according to the present invention, the diffusion characteristic has a diffusivity in a predetermined angle range in the point light source arrangement direction. According to this configuration, while maintaining the effect of the light distribution control in the direction orthogonal to the direction of the point light source arrangement, it is diffused greatly in the direction in which the plurality of point light sources are arranged, and the dots arranged in a discrete manner Even if a light source is used, it is possible to reduce the luminance unevenness due to the discrete arrangement and realize a lighting device with uniform luminance.

  In the shelf illuminating device having the above-described configuration, the light guide path includes a first light guide path and a second light guide path that branch and guide light from the point light source in two different directions. The first and second reflecting surfaces and the cap member are provided in each light guide path, and the shortest optical path length to the incident surface of each cap member is L1. Yes. According to this configuration, for example, an upward illumination that illuminates the front of the product displayed on the upper surface side of the shelf and a downward illumination that illuminates the upper part of the product displayed on the lower shelf, respectively, Luminance unevenness caused by the discrete arrangement can be reduced, and an illumination device with uniform luminance can be realized.

  In the shelf illuminating device having the above-described configuration, the light guide path includes a first light guide path and a second light guide path that branch and guide light from the point light source in two different directions. The first and second reflecting surfaces are provided in each light guide path, the cap member is provided in one of the light guide paths, and an exit surface orthogonal to the light guide path is provided in the other light guide path. A second cap member is provided, and the shortest optical path length to the incident surface of each cap member is L1. According to this configuration, for example, it is possible to realize an illuminating device that emits illumination light directly downward through the second cap member on the downward illumination side of the shelf to which the shelf illuminating device is attached.

  According to the present invention, in the shelf illuminating device having the above-described configuration, the point light source is provided at a position orthogonal to the light guide path, and the light from the point light source is branched into the first and second light guide paths. It is characterized by providing a branch part. According to this configuration, light from one point light source can be efficiently guided to the first and second light guide paths via the light beam branching unit, and for example, the top and bottom of the shelf can be illuminated uniformly at the same time. An illumination device can be realized.

  According to the present invention, in the shelf illuminating device having the above-described configuration, an incident light guide path that guides light from the point light source to the light beam branching portion is provided, and each of the incident light guide paths is provided on both sides of the point light source. The third and fourth reflecting surfaces are provided. According to this configuration, by taking the optical path length to the branching portion, the width of the optical path corresponding to the vertical width of the shelf plate can be reduced, and further, the lighting device can be made compact.

  According to the present invention, in the shelf lighting device having the above-described configuration, the point light source is an LED light source. According to this configuration, a highly efficient shelf board illumination device can be realized using an LED light source with high illuminance, low power consumption, and low heat generation.

  Moreover, the present invention is a shelf unit provided with the shelf illuminating device according to any one of claims 15 to 30 at a tip end portion. According to this configuration, by using a shelf illuminator that can be made compact and can effectively illuminate a predetermined range, a shelf having an illumination function that can efficiently illuminate products displayed on the shelf with high quality. A plate unit can be obtained.

  Moreover, the present invention is a showcase including a plurality of shelf unit units according to claim 31. According to this configuration, by using a shelf unit having an illumination function that can efficiently illuminate the products on the shelf board, the products on the shelf board can be efficiently illuminated with high quality with a few point light sources. It is possible to obtain a showcase that can illuminate products displayed on a board with uniform brightness.

  According to the present invention, after the anisotropic diffusion portion is provided in a predetermined portion separated by a predetermined optical path length according to the arrangement pitch of the point light sources, and the predetermined intensity portions of the light emitted from the adjacent point light sources are overlapped Therefore, light that is diffused by a predetermined angle in a predetermined direction is emitted, so that the light from the point light source can be controlled to be distributed in a desired specific direction. It is possible to obtain a lighting device capable of effective illumination that is not dazzling even if it is reflected in the image and does not deteriorate the appearance of the product. Moreover, in the shelf illuminating device used for the showcase provided with a shelf, the shelf illuminating device which can be made compact and can effectively illuminate a predetermined range can be obtained.

It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 1st embodiment which concerns on this invention. It is a schematic front view of the illuminating device of 1st embodiment. It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 2nd embodiment which concerns on this invention. It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 3rd embodiment which concerns on this invention. It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 4th embodiment which concerns on this invention. It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 5th embodiment which concerns on this invention. It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 6th embodiment which concerns on this invention. It is a schematic sectional drawing which shows the outline | summary of the illuminating device of 7th embodiment which concerns on this invention. It is a general | schematic cross-section block diagram which shows an example of the showcase which attached the illuminating device which concerns on this invention to the shelf board. It is a schematic sectional drawing which shows the shelf illuminating device of 1st embodiment. It is a schematic explanatory drawing which shows the relationship between the optical path length of the shelf illuminating device of FIG. 10, the arrangement pitch of a point light source, and the directivity angle half value width of a point light source. It is a figure explaining the entrance plane brightness | luminance of the shelf illuminating device of FIG. It is a figure which shows the relationship between the incident angle and reflectance in the cap member of the shelf illuminating device of FIG. It is a figure which shows the luminance distribution of the illumination light which the shelf illuminating device of FIG. 10 irradiates. It is a schematic sectional drawing which shows the shelf illuminating device of 2nd embodiment. It is a figure which shows the luminance distribution of the illumination light which the shelf illuminating device of FIG. 15 irradiates. It is a schematic sectional drawing which shows the modification of the shelf illuminating device of 2nd embodiment. It is a schematic sectional drawing which shows the shelf illuminating device of 3rd embodiment. It is a figure which shows the luminance distribution of the illumination light which the shelf illuminating device of FIG. 18 irradiates. It is a schematic sectional drawing which shows the shelf illuminating device of 4th embodiment. It is a schematic sectional drawing which shows the shelf illuminating device of 5th embodiment. It is a schematic sectional drawing which shows the shelf illuminating device of 6th embodiment. It is a schematic sectional drawing which shows the shelf illuminating device of 7th embodiment. It is a schematic sectional drawing which shows the shelf unit provided with the shelf illuminating device which illuminates the upper part of a shelf. It is a schematic sectional drawing which shows the shelf unit provided with the shelf illuminating device which illuminates the upper and lower sides of a shelf simultaneously. It is a side view which shows an example of the showcase which has a multistage shelf board.

  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, the lighting device according to the present invention will be described with reference to FIGS. The illumination device according to the present invention is for, for example, illuminating a product or the like displayed on a shelf board, and a plurality of point light sources arranged at predetermined intervals along the longitudinal direction of the front end of the shelf board. The illumination device is configured to guide light emitted from the point light source to an emission unit through a light guide path and emit the light from the emission unit to illuminate a predetermined direction.

  In addition, the light guide path is formed of a first reflecting surface and a second reflecting surface that are arranged to face each other, and is anisotropic to a predetermined portion that is separated by a predetermined optical path length according to the arrangement pitch of the point light sources. A diffusion unit is provided, and after a predetermined intensity portion of light emitted from the adjacent point light sources overlaps, the light diffused by a predetermined angle in a predetermined direction is emitted.

  With the configuration described above, since the light beams of the adjacent point light sources overlap each other and then diffused and emitted in a predetermined direction, it can be emitted as uniform illumination light. For this reason, the light from the point light source can be controlled to distribute light in a desired specific direction, and it can be illuminated efficiently and uniformly, and even if the light source is uniform and reflected in the product, it will not be dazzling and will not deteriorate the appearance of the product. It is possible to obtain an illuminating device that can perform appropriate illumination.

  First, the first embodiment of the illumination device according to the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the illuminating device 1A includes a point light source 2, a light guide path 10A formed by a first reflecting surface 11 and a second reflecting surface 12 that are arranged to face each other, and an emitting unit 30. It is set as the structure provided. The emitting unit 30 may be configured so that light guided through the light guide path 10A is emitted in a predetermined direction, and a predetermined translucent member or light guide element may be used even at the open end. In this embodiment, a translucent member is provided. That is, the emission part 30 is the emission surface 13 formed from a translucent member.

  In addition, the light guide path 10A formed by the first reflecting surface 11 and the second reflecting surface 12 is a direction directed upward from the point light source 2 and is slightly inclined from the exit surface 13 (for example, a product) Injected with high intensity in a specific direction (in the direction of arrow A in the figure) inclined to the direction.

  The point light source 2 is, for example, a chip-type LED light source in which LEDs are mounted on a substrate 21 (see FIG. 8), and is excited by a blue LED chip and light from the LED chip to emit excitation light having a predetermined wavelength. A white LED light source that emits white light in combination with a phosphor that emits light is used. For example, in order to uniformly illuminate the entire width of the shelf board, the substrate 21 has a length about the width of the shelf board, and a plurality of LED light sources serving as the point light sources 2 are mounted on the board 21 at a predetermined pitch. However, in the case where the shelf width is wide, it may be configured to be divided into a plurality of substrates and electrically connected to each other.

  Therefore, as shown in FIG. 2, the illuminating device 1A is elongated along the longitudinal direction in which a plurality of point light sources 2 are arranged in parallel at a predetermined interval, and a long reflective surface (first reflective surface 11 and second reflective surface 11). It has a reflecting surface 12) and an exit surface 13.

  In addition, in order to make the light emitted from the plurality of point light sources 2 arranged at a predetermined interval uniform, the light of adjacent light sources is overlapped in this juxtaposed direction and emitted by being diffused within a predetermined angle range. It is preferable to do. Therefore, in this embodiment, it is set as the structure which provides the spreading | diffusion part 14 (anisotropic diffusion part) in the output surface 13. FIG.

  With such a configuration, by providing the anisotropic diffusion portion 14 on the surface farthest from the light source, the optical path length from the light source to the anisotropic diffusion portion 14 can be secured to the maximum, and the illumination can be made more compact and uniform. It is preferable that an illuminating device 1A capable of achieving the above can be realized.

  Moreover, it is preferable that the anisotropic diffusion part 14 has a big spreading | diffusion characteristic by the longitudinal direction in which the point light source 2 is arrange | positioned. If it is this structure, even if it uses the point light source 2 discretely arrange | positioned by overlapping and efficiently disperse | distributing the light which the several point light source 2 discretely arrange | positioned at predetermined intervals overlaps, it is uniform. Illumination light as a surface light source can be emitted.

  For example, the anisotropic diffusion unit 14 has a larger diffusion degree (for example, 40 degrees) in the arrangement direction (for example, the horizontal direction) of the point light sources 2 and is perpendicular to the direction (for example, the vertical direction). The unidirectional diffusion unit diffuses only a small diffusion degree (for example, 1 degree). With such a configuration, a predetermined angle range is illuminated with high illuminance without diffusing in the vertical direction, and the horizontal direction (longitudinal direction) in which the point light sources 2 are arranged in parallel is determined by the anisotropic diffusion unit 14. The light from the adjacent light sources is diffused and mixed to become a uniform secondary light source.

  The anisotropic diffusion part 14 may be provided on a surface other than the exit surface 13, for example, may be provided on the second reflection surface 12 that reflects the guided light beam toward the exit surface 13. With this configuration, since the anisotropic diffusion portion 14 is provided on the reflection surface (second reflection surface 12) that guides the light beam toward the emission surface 13, it is guided to the emission surface 13 while diffusing in a predetermined angle range. An illuminating device that can emit light and can perform uniform illumination without providing the anisotropic diffusion portion 14 on the exit surface 13 can be realized.

  Moreover, when providing the anisotropic diffusion part 14 in the 2nd reflective surface 12, it is preferable to provide in the site | part facing the injection | emission part of the 2nd reflective surface 12. FIG. With this configuration, since it diffuses immediately before being emitted, it is not diffused and reflected repeatedly, the divergence angle is not increased unnecessarily, and uneven illumination of multiple point light sources can be reduced and uniform illumination is possible. It is preferable.

  For example, the anisotropic diffusion portion 14 can be provided by forming a fine and random uneven surface of submicron to several tens of microns on the surface of a translucent member. Moreover, a desired diffusion degree can be obtained according to the size and arrangement state of the uneven shape.

  For example, a diffusion member that diffuses greatly in one direction and hardly diffuses in the vertical direction by forming a fine and random uneven shape into a stripe shape and forming a shape without a fine uneven shape in the vertical direction. Can be obtained. In addition, a diffusive shape with a relatively fine size of about 1 micron provides a large diffusivity, and a relatively large concavo-convex shape of about 10 microns results in a small diffusivity of several degrees.

  Further, a method other than the method of forming the anisotropic diffusion portion 14 by providing a fine uneven surface on the surface of the translucent member may be used. For example, a diffusion sheet or a diffusion film exhibiting a predetermined diffusion degree may be provided at a predetermined site. It is good also as a structure to affix.

In order to make the brightness of the light emitted from the adjacent point light sources 2 uniform using such an anisotropic diffusion unit 14, the light of a predetermined intensity from the adjacent point light sources 2 is diffused and then diffused. Therefore, it is preferable that light with an intensity of 30% or more from the adjacent point light sources 2 overlap. Furthermore, when the shortest optical path length from the point light source 2 to the anisotropic diffusing unit 14 is L1, the arrangement pitch of the point light sources 2 is P, and the half angle width of the point light source 2 is θ1,
L1> P / 2 tan θ1 (Formula 1)
It is preferable to satisfy. With this configuration, by securing the shortest optical path that satisfies this conditional expression, light with an intensity of 1/2 from adjacent point light sources becomes light that is mixed and mixed, and luminance unevenness on the exit surface is suppressed. Thus, the brightness can be made substantially constant.

  For example, when an LED light source having a directivity angle half-value width θ1 of 60 ° is used as the point light source 2, the shortest optical path length L1 from the point light source 2 to the anisotropic diffusion unit 14 may be about 0.3P. With this configuration, it is possible to secure the shortest optical path length in which light having an intensity of 1/2 from adjacent point light sources 2 overlaps, and to obtain a small and compact illumination device with a short optical path. preferable.

  Further, in the present embodiment, the distance from the point light source 2 to the anisotropic diffusion unit 14 is set to half of the arrangement pitch P, and the light fluxes whose intensity is half or more of the point light source 2 overlap each other on the diffusion unit 14. In this way, the illumination device is capable of uniform illumination.

  For example, when the point light source 2 having an intensity half value (directivity angle half value width θ1) of ± 60 degrees is set to 20 mm, the shortest distance from the point light source 2 to the diffusion unit 14 is 10 mm. According to (Equation 1), the shortest optical path length L1 is about 7 mm, but it is 10 mm longer than this, so that the light beams having half-intensities overlap.

  Further, as shown in FIG. 1, a light beam R1a that is directly guided from the point light source 2 to the emission unit 30 and emitted, and after being reflected by the second reflecting surface 12, is guided to the emission unit 3 and emitted. The light flux R1b is overlapped. That is, the second reflecting surface 12 is preferably installed so that the light beam reflected by the reflecting surface is superimposed on the light beam that is directly guided from the point light source 2 to the emitting unit 30. If it is this structure, the illuminating device which can illuminate a specific direction (arrow A direction in a figure) with high intensity | strength can be obtained.

  In addition, the light beam R1c reflected by the first reflecting surface 11 and then reflected by the second reflecting surface 12 and guided to the diffusing portion 14 also becomes illumination light. Light beams having different numbers of reflections have different optical path lengths, and these light beams are mixed together, so that a secondary light source uniform in the light source arrangement direction can be obtained, and the illumination target can be illuminated uniformly.

  Although the unidirectional diffusing unit is used as the anisotropic diffusing unit to illuminate the A direction with high intensity, the present invention is not limited to this. For example, when illuminating slightly wide, You may diffuse about 10 degree | times to a perpendicular direction. However, since it becomes dark when the diffusivity is increased, it is possible to efficiently illuminate a specific direction with high intensity by setting the diffusivity at least smaller than the diffusivity in the arrangement direction.

  The point light source 2 is, for example, a white LED light source using a yellow phosphor that receives a blue LED and blue to excite yellow. Further, the light source is not limited to a white LED light source, but may be a point light source, and a white LED light source using three primary colors of red, blue, and green, or a non-white LED light source may be used.

  In addition, the first and second reflecting surfaces may be tilted and light distribution control may be performed so as to illuminate a predetermined direction with high intensity. For example, as shown by a broken line in the figure, the tilted first reflecting surface 11a is By using it, it is possible to illuminate a specific direction with higher intensity by further directing the light reflected on this surface in the A direction.

  In addition, it is possible to simultaneously illuminate a predetermined two directions (for example, the upper and lower sides of the shelf) using an illuminating device that can guide light emitted from the point light source 2 in two different directions. This configuration will be described with reference to FIGS.

  FIG. 3 shows a lighting device 1B of the second embodiment. The light guide path of the illuminating device 1B includes a first light guide path 10Ba and a second light guide path 10Bb that branch and guide light from the point light source 2 in two different directions. Further, the first and second reflecting surfaces and the exit surface are provided. Such a configuration is preferable because it is possible to obtain an illuminating device capable of simultaneously and uniformly illuminating two different directions (for example, the top and bottom of the shelf board).

  For example, a point-like shape is formed at a substantially central portion of the second reflecting surface 12B (a general term that combines the second reflecting surface 12Ba and the second reflecting surface 12Bb) that is a branching portion between the first light guiding path 10Ba and the second light guiding path 10Bb. A light source 2 is installed, and a branched reflection surface 15 that branches the light beam up and down is provided on the first reflection surface side facing the point light source 2.

  The branch reflection surface 15 includes a first branch reflection surface 15a that reflects light from the point light source 2 toward the upper side of the drawing and a second branch reflection surface 15b that reflects the light toward the lower side, for example, 90 °. It is the reflective surface which cross | intersected V shape.

  Therefore, the light emitted from the point light source 2 is reflected toward the upper side of the drawing by the first branch reflecting surface 15a and is reflected by the first reflecting surface 11Ba and the second reflecting surface 12B to perform the first illumination. Injected mainly from the exit surface 13Ba in the direction of arrow A. Further, the light reflected downward from the second branched reflecting surface 15b is reflected by the first reflecting surface 11Bb and the second reflecting surface 12B and is mainly reflected from the second emitting surface 13Bb that performs the lower illumination. Injected in the direction of arrow B.

  In the present embodiment, the light guide path formed by the first and second reflecting surfaces and the exit surface is directed so that, for example, light directed from the point light source 2 directly toward the exit surface 13Ba directly faces the arrow A direction. The light that is set and reflected directly by the first branch reflecting surface 15a, or the light that is reflected by the first reflecting surface 11Ba or the second reflecting surface 12B after being reflected by the first branch reflecting surface 15a, It is set so as to substantially overlap in the A direction.

  Also in this embodiment, the anisotropic diffusion portion 14 is provided on the first exit surface 13Ba. For example, the anisotropic diffusion unit 14 diffuses 80 degrees in the arrangement direction of the point light sources 2 and diffuses 30 degrees in the vertical direction.

  In this way, by diffusing about 30 degrees in the vertical direction, the light beam emitted from the first emission surface 13Ba has a predetermined angle in the direction orthogonal to the direction in which the point light sources 2 are arranged in parallel as shown in the figure. Diffused and emitted illumination light that is uniformly mixed in a planar shape is emitted.

  Further, the shortest distance from the point light source 2 to the anisotropic diffusion portion 14 is set to 7 mm, which is about 30% when the light source pitch is 20 mm. With this configuration, since the shortest optical path length from the point light source 2 to the diffusing unit 14 is 7 mm or more, the above-described illumination device 1B that is set so that uniform illumination can be performed by overlapping the light beams with half or more intensities described above. Become.

  The anisotropic diffusion part 14 may be provided on the lower emission surface 13Bb, but this illuminating device 1B is particularly anisotropic when it is only necessary to emit illumination light downward on the shelf. It is not necessary to provide the sex diffusion part 14.

  Moreover, the point light source 2 may be installed in the 1st reflective surface side, and the branch reflective surface 15 may be provided in the 2nd reflective surface side like the illuminating device 1C of 3rd embodiment shown in FIG. The branch reflection surface 15 includes a first branch reflection surface 15a that reflects light from the point light source 2 toward the upper side of the drawing and a second branch reflection surface 15b that reflects the light toward the lower side, for example, 90 °. It intersects in a V shape.

  Even in this configuration, the light emitted from the point light source 2 is reflected toward the upper side of the drawing by the first branch reflection surface 15a, and is reflected by the first reflection surface 11Ca and the second reflection surface 12Ca, and is emitted. 13Ca is injected with high strength mainly in the direction of arrow A. Further, the light reflected downward from the second branched reflection surface 15b is reflected by the first reflection surface 11Cb and the second reflection surface 12Cb, and mainly from the exit surface 13Cb toward the arrow B direction. Injected with high strength.

  The upper exit surface 13Ca is provided with a refracting body 4 that refracts and emits light in a predetermined direction, and the light emitted from the point light source 2 is reflected by the first branch reflecting surface 15a toward the upper side in the figure. The directly emitted light is efficiently emitted in the direction of arrow A through the refracting body 4.

  Moreover, in this embodiment, it is set as the structure which provided the anisotropic diffusion part 14 in the back surface side of the injection surface 13Ca. The anisotropic diffusion unit 14 diffuses 80 degrees in the arrangement direction of the point light sources 2 and diffuses 60 degrees in the vertical direction, for example. Thus, since the refractor 4 is provided even if the diffusivity in the vertical direction is large, the emission direction can be limited by the total reflection and the inclined arrangement of the refractor 4, and the vicinity of the arrow A direction which is a specific direction is high. Can be illuminated with high intensity.

  Moreover, you may form a light guide path | route using a light guide element, and this embodiment is described using FIGS.

  The illumination device 1D of the fourth embodiment shown in FIG. 5 shows an example using a light guide element 3 having a refractive index larger than 1 (for example, PMMA: acryl having a refractive index of about 1.5). Further, an incident surface 31 on which light from the point light source 2 is incident, an exit surface 32 that emits light, and a light beam incident from the incident surface 31 are disposed so as to be guided to the exit surface 32. It has a pair of reflective surfaces (first reflective surface 33, second reflective surface 34).

  Moreover, the anisotropic diffusion part 14 is set as the structure provided in the site | part facing the output surface 32 of the 2nd reflective surface 34, for example. As described above, by providing the anisotropic diffusion portion 14 only at the portion facing the emission surface 32, the divergence angle of the light flux is not increased unnecessarily by diffusion, and the luminance unevenness of the plurality of point light sources 2, the light guide element Luminance unevenness of light beams with different numbers of reflections on the inner surface is reduced.

  In addition, light that is directly reflected from the incident surface 31 or reflected by the first reflecting surface 33 and directly guided to the exit surface 32 is an angle at which the exit surface 32 is nearly parallel to the first reflecting surface 33 and the second reflecting surface 34. (For example, it is inclined by 10 to 30 °, preferably 15 °). Therefore, after repeating the round-trip reflection that is totally reflected on the exit surface 32 and reflected toward the exit surface 32 by the second reflecting surface 34, the entire surface is reflected on the exit surface 32. It emits sequentially from the ones that are out of reflection.

  Further, the anisotropic diffusion unit 14 is, for example, a diffusion unit that diffuses 80 degrees in the arrangement direction of the point light sources 2 and diffuses at a smaller diffusion angle in the vertical direction. The degree of diffusion in the vertical direction may be about 10 to 60 degrees. For example, even when the diffusivity in the vertical direction is 60 degrees, the emission direction is limited by the total reflection of the light guide element 3 as described above. The direction of arrow A can be illuminated with high intensity.

  That is, by setting the inclination angle of the emission surface 32 to about 15 °, which is an angle nearly parallel to the second reflection surface 34, the emission surface 32 is emitted obliquely from the normal direction of the emission surface 32, for example, High-intensity light is emitted in the vicinity of a specific direction inclined by 45 °, almost no light is emitted in a direction perpendicular to the second reflecting surface 34, and only a specific arrow A direction is illuminated with high intensity. Can be controlled.

  In addition, since the anisotropic diffusing portion 14 is provided on the second reflecting surface 34, color unevenness due to chromatic dispersion during refraction of a light beam emitted largely obliquely from the emitting portion 32 can be suppressed by diffusion before emitting. . In addition, light having a different number of reflections between the reflecting surfaces facing each other is slightly different in incident angle and emission position on the emission surface 32 by the anisotropic diffusing unit 14, and thus uniformly emitted without being mixed and greatly diffused. To do.

  For the light that is not totally reflected by the first reflecting surface 33 and the second reflecting surface 34, for example, an aluminum cover is disposed on the back surface of each reflecting surface so that the light reflected by the cover is incident on the light guide element 3 again. Configure. For this purpose, a reflective member that has been subjected to white reflection treatment or mirror treatment with white coating may be arranged on the aluminum cover, or instead of the aluminum cover, mirror treatment or mirror film is applied to the reflective surface. Also good.

  In the present embodiment, since the light guide path is formed by the light guide element 3, the light guide path becomes longer than when the light guide path is formed using a hollow air layer. Therefore, an emission part is provided at a position away from the light source, and a part away from the light source can be illuminated, which is suitable as an illumination device for a shelf board having a large vertical width.

  The illuminating device 1E of the fifth embodiment shown in FIG. 6 uses a pair of upper and lower light guide elements 3A having substantially the same shape as the light guide element 3 described above, and branches light from the point light source 2 in two different directions. The light is guided.

  Therefore, the incident surfaces 31Aa and 31Ab that face the point light source 2 and are inclined at a predetermined angle serve as light beam branch surfaces that branch the light beam in two different directions. That is, the light guided from the incident surface 31Aa emitted from the point light source 2 toward the upper side in the figure is emitted from the emission surface 32Aa in the direction indicated by the arrow A and from the incident surface 31Ab toward the lower side in the figure. The light to be guided is emitted from the emission surface 32Ab in the direction indicated by the arrow B.

  As described above, the light beam emitted from the point light source 2 is divided into two different directions, and each light beam illuminates the A direction and the B direction. Therefore, it is possible to efficiently illuminate a specific direction limited to high intensity. Moreover, even if the point light source 2 is a light source condensed in a predetermined angle range such as an LED light source with a lens, the anisotropic diffusion portion 14 is provided in a wide portion of the second reflecting surface 34A, for example. Thus, it is possible to obtain an illuminating device that can diffuse at a large angle and perform sufficiently uniform illumination.

  Further, since it is provided in a wide portion of the second reflecting surface 34A, in the present embodiment, as the anisotropic diffusion portion 14, a diffusion portion having a diffusion degree of 30 degrees in the light source array direction and 0.5 degrees in the vertical direction thereof. Is used.

  Moreover, it replaces with a pair of two pieces, and the integrated light guide element of the shape which combined the pair of two pieces can also be used. For example, the light can be branched and guided in two different directions using a T-shaped light guide element. In addition, when a light guide element having a T-shaped cross section is used, a long optical path length from the light source to the exit surface can be secured, which is effective for downsizing and downsizing of the lighting device. This embodiment will be described with reference to FIG.

  FIG. 7 shows a lighting device 1F of the sixth embodiment. This illumination device 1F includes a light guide element 3B having a T-shaped cross section and has a first light guide path 10Fa and a second light guide path 10Fb branched in two different directions, for example, up and down, The incident light guide path 10Fc guides the light from the point light source 2 to the first and second light guide paths.

  In addition, a reflecting member is provided at a portion corresponding to the reflecting surface, and a reflecting surface that guides all light to the exit surface is formed. For example, a first reflecting surface 11F, a second reflecting surface 12F, and an incident reflecting surface (upper incident reflecting surface 17a, lower incident reflecting surface 17b) are provided. Further, a plurality of point light sources 2 are discretely arranged in a direction perpendicular to the paper surface, and the inclination angle of the emission surface (first emission surface 32Ba, second emission surface 32Bb) with respect to the second reflection surface 12F is about 10 °.

  As described above, by using the light guide element 3B having a T-shaped cross section, the optical path length from the light source to the exit surface can be increased, and light from adjacent point light sources is mixed to obtain uniform illumination light. be able to. Further, for example, the anisotropic diffusion portion 14 may be provided on the second reflecting surface 12F so as to be mixed better.

  The anisotropic diffusion unit 14 is, for example, a unidirectional diffusion unit having a diffusion degree of 60 degrees in the light source arrangement direction. Moreover, you may make it provide only in the part close | similar to each emission surface of the 2nd reflective surface 12F.

  In the present embodiment, the incident surface 31B is formed in a V shape, and the first incident surface 31Ba and the second incident surface 31Bb are, for example, surfaces inclined by 20 °. Then, the light is incident from the first incident surface 31Ba, and is emitted from the second incident surface 31Bb through the upper incident reflection surface 17a and from the second light guide path 10Fb toward the lower side of the drawing, as indicated by the arrow B in the drawing. The emission light indicated by the arrow A in the figure heading upward from the first light guide path 10Fa through the lower incident reflection surface 17b is generated.

  In the above configuration, the light guide path is configured by the light guide element 3B having a refractive index larger than 1, the incident surface on which the light emitted from the point light source 2 enters the light guide element 3B, and the exit surface from which the light beam is emitted. And an opposite reflecting surface for guiding the light beam incident on the incident surface to the exit surface, and an anisotropic diffusion part is provided on at least one of the exit surface and the reflective surface. Therefore, by forming the light guide path with the light guide element 3B, the light guide path becomes longer and the part away from the light source is illuminated compared to forming the light guide path using an air layer in a hollow space. This is suitable as a lighting device for the shelf board 5 having a large vertical width.

  That is, by providing this lighting device 1F on a multi-stage shelf such as a product showcase, it is possible to illuminate products on the shelf from above and below, and to provide efficient and bright illumination with little shadow. it can. In addition, this brings about an effect of increasing the purchase intention of the product purchaser.

  Moreover, the illuminating device 1G of 7th Embodiment shown in FIG. 8 can be used as an illuminating device which a shelf board, such as a showcase, attaches. This illuminating device 1G simultaneously illuminates the top and bottom of the shelf plate via a light guide element 3C integrated with a V-groove 35 that branches a light beam up and down in a flat intermediate portion.

  This illuminating device 1G has a configuration in which a substrate 21 on which a point light source 2 is mounted, a light guide element 3C, and a second reflecting surface 12G are attached via a holder 6 and a stay 7 attached to the tip of a shelf board 5. In addition, the first reflecting surface 11G may be attached to a predetermined portion of the light guide element 3C including the surface facing the substrate 21.

  The point light source 2 is disposed at a position facing the V groove 35 having the first inclined surface 35a and the second inclined surface 35b, and the light emitted from the point light source 2 is the first inclined surface 35a. Is reflected upward by the first light guide path 10Ga and emitted from the first emission surface 32Ca performing the upper side illumination of the shelf board in the direction of arrow A in the specific direction, and the second inclination. The light beam is reflected downward by the surface 35b and branched into a light beam emitted in the direction of the arrow B1 in a wide range from the second emission surface 32Cb that performs the lower illumination of the shelf via the second light guide path 10Gb. Is done.

  In addition, a second reflecting surface 12G having a reflecting function is provided outside the light guide element 3C, and the first exit surface 32Ca has an inclination angle (about 10 degrees) close to parallel to the second reflecting surface 12G and has a specific direction. The direction of arrow A in the figure is mainly illuminated. In the present embodiment, the second emission surface 32Cb that performs the lower illumination is formed horizontally (perpendicular to the second reflection surface 12G) so that the illumination light is greatly scattered downward.

  For this purpose, light can be widely scattered and widely illuminated toward the lower shelf through the second exit surface 32Cb, and the upper surface of the product displayed on the lower shelf can be effectively illuminated. . Moreover, a specific direction can be illuminated toward diagonally upward of a shelf board via the 1st injection | emission surface 32Ca, and the front surface of the goods displayed on the shelf board can be illuminated effectively. Further, by providing the anisotropic diffusion portion 14 on the first emission surface 32Ca, the light from the plurality of point light sources 2 installed at predetermined intervals can be further mixed to obtain uniform illumination light. it can.

  As described above, the illumination light that effectively illuminates the object surface of the product M placed on the shelf board 5 and illuminates a wide range below the shelf board 5 by illumination light directed obliquely upward. Thus, the upper part of the product placed on the shelf below the shelf 5 is effectively illuminated. That is, by providing the lighting device 1G according to this embodiment on a plurality of shelves, an object on the shelves can be illuminated from above and below, so that it is possible to efficiently illuminate with less shadows.

  Moreover, it is also possible to use combining suitably the illuminating devices 1E-1G which install in the front end of a shelf board and illuminate the upper and lower sides of a shelf board simultaneously.

  For example, like a showcase SC shown in FIG. 9, a pedestal 101, a main body frame 102, and a cooler 103 are provided, and a plurality of shelf boards 5A, 5B, and 5C are provided in the display room, and shelf boards are provided at the front ends of the respective shelf boards. In the configuration in which the lighting device 1 (1E to 1G) is mounted, the lighting device RA (1E to 1G) mounted on the shelf board 5A illuminates the front area of the product placed on the shelf board 5A. The illumination light RB1 that illuminates the upper region of the product placed on the shelf board 5B is uniformly emitted.

  Moreover, the illuminating device 1 attached to the shelf board 5B uniformly applies illumination light RA2 that illuminates the front area of the product placed on the shelf board 5B and illumination light RB2 that illuminates the upper area of the product on the shelf board 5C. The illuminating device 1 which is emitted and attached to the shelf board 5C has illumination light RA3 that illuminates the front area of the product placed on the shelf board 5C, and illumination light that illuminates the upper area of the product under the shelf board 5C. RB3 is ejected uniformly.

  In this way, by attaching the lighting device 1 (1E to 1G) according to the present embodiment to each shelf board 5 of the showcase SC including a plurality of shelf boards 5, the upper and lower sides of the shelf board 5 are illuminated simultaneously. Thus, the lighting device can efficiently and uniformly illuminate the products displayed on the showcase SC.

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

  As described above, according to the illuminating device of the present invention, the anisotropic diffusion portion is provided in a predetermined portion separated by a predetermined optical path length according to the arrangement pitch of the point light sources, and is emitted from the adjacent point light sources. Since the light diffused by a predetermined angle in a predetermined direction is emitted after a predetermined intensity part of the light overlaps, the light from the point light source can be controlled to distribute light brightly and efficiently in a specific direction. In addition, it is possible to obtain an illuminating device that can perform effective illumination that is uniform and does not dazzle even if the light source is reflected in the product and does not deteriorate the appearance of the product.

  In addition, since the anisotropic diffusion unit has a larger diffusion characteristic in the longitudinal direction in which the point light sources are arranged, the light emitted from a plurality of point light sources that are discretely arranged at a predetermined interval is overlapped. By dispersing well, uniform illumination light can be emitted from discretely arranged point light sources.

  In addition, since the LED light source is used as the point light source, a highly efficient lighting device can be realized using an LED light source with high illuminance, low power consumption, and low heat generation.

  Next, a first embodiment of the shelf lighting device according to the present invention will be described with reference to FIG. A shelf illuminating device 1AA shown in FIG. 10 is an illuminating device used for a showcase including a shelf, and emits light from the plurality of point light sources 2 arranged at intervals in the longitudinal direction of the shelf. The illumination optical system includes: a light guide path 10AA that guides light to be transmitted in a direction orthogonal to the longitudinal direction; and an emission unit that emits the guided light in a predetermined direction. Further, the light guide path 10AA is constituted by first and second reflecting surfaces facing each other with an air layer interposed therebetween, and the emission part is constituted by a cap member 3AA having an incident surface and an emission surface.

  That is, a plurality of point light sources 2 are arranged at predetermined intervals with the vertical direction in the drawing as the longitudinal direction, and the first reflecting surface 11AA and the second reflecting surface 12AA are also extended in this longitudinal direction. For example, the shelf lighting device 1AA that directly attaches to the front end of a shelf board such as a showcase to illuminate a product displayed on the shelf board.

  In addition, the cap member 3AA included in the shelf board lighting device 1AA of the first embodiment is a flat plate-shaped transparent member disposed at an upper end of the opposing first and second reflecting surfaces as shown in the figure. It consists of an optical member (for example, PMMA: acryl having a refractive index of about 1.5). That is, the entrance surface 31AA and the exit surface 32AA included in the cap member 3AA are parallel to each other and are inclined so as to be directed to the products displayed on the shelf board. For example, the angle θ2 formed by the direction guided through the light guide path 10AA and the perpendicular of the exit surface 32AA is inclined by about 65 °.

  As described above, the shelf board lighting device 1AA includes the light guide path 10AA composed of the first and second reflecting surfaces facing each other with the air layer interposed therebetween, and thus the air layer is used as the light guide path. It has a configuration in which light from adjacent point light sources 2 having a large light distribution angle is mixed at a short distance. Further, the cap member 3AA is provided so that the light beams from the adjacent point light sources 2 overlap each other at the position of the emission surface 32AA of the cap member 3AA.

  With such a configuration, the light beams from the adjacent point light sources 2 overlap each other at the position of the exit surface 32AA of the cap member 3AA with respect to the longitudinal direction of the shelf plate, and thus are uniform in the longitudinal direction. Lighting is possible. Further, since the air layer is used as the light guide path, the light from the point light source 2 is mixed with a short optical path length, and the mixed light is emitted from the cap member 3AA in a predetermined direction. Therefore, it is possible to obtain a shelf illuminating device 1AA that can be made compact and can effectively illuminate a predetermined range.

Further, when the shortest optical path length from the point light source 2 to the incident surface 31AA is L1, the arrangement pitch of the point light sources 2 is P, and the directional angle half-value width of the point light source 2 is θ1,
L1> P / 2 tan θ1 (Formula 1)
The cap member 3AA is disposed at a position that satisfies the above.

  With such a configuration, the light whose intensity of light emitted from the adjacent point light sources 2 is halved overlaps and mixes, and then enters the entrance surface 31AA and exits from the exit surface 32AA. Therefore, it is preferable that the illumination light can be emitted evenly mixed and the light intensity is approximately the same level.

  The point light source 2 is, for example, a chip-type LED light source in which LEDs are mounted on a substrate 21, a blue LED chip, and a phosphor that emits excitation light having a predetermined wavelength when excited by light from the LED chip. , And a white LED light source that emits white light. For example, in order to uniformly illuminate the entire width of the shelf board, the substrate 21 has a length about the width of the shelf board, and a plurality of LED light sources serving as the point light sources 2 are mounted on the board 21 at a predetermined pitch. However, in the case where the shelf width is wide, it may be configured to be divided into a plurality of substrates and electrically connected to each other.

  Further, using an LED light source having a directivity angle half-value width θ1 of about 60 °, an optical path length when the arrangement pitch P of adjacent light sources is 50 mm, an arrangement pitch of the point light sources, and a directivity angle half-value width of the point light source The relationship will be described with reference to FIG.

  As shown in FIG. 11, on the incident surface 31AA of the cap member 3AA, when the adjacent point light sources 2 are arranged at the arrangement pitch P = 50 mm, the light beams Da and Db having the directivity angle half width θ1 are overlapped and mixed. It is arranged at the position after

  That is, the light beams Da and Db having a directivity angle half width θ1 are overlapped and mixed at the position of the distance L0 (position corresponding to P / 2 tan θ1), and the incident surface 31AA has an optical path length L1 longer than L0. Therefore, the light incident on the cap member 3AA from the incident surface 31AA becomes light in which light of half the intensity of the light emitted from the respective point light sources 2 is overlapped and mixed, and luminance unevenness in the longitudinal direction is reduced. It becomes the structure which inject | emits the emitted light uniformly.

  For example, as shown in FIG. 12, the incident surface luminance incident on the incident surface 31AA is a mixture of the luminance Ra of light emitted from one adjacent point light source 2 and the luminance Rb of light emitted from the other point light source 2. A combined luminous flux having a substantially uniform luminance R is synthesized.

  That is, it was found that the luminance in the arrangement direction of the point light sources 2 at the position of the incident surface 31AA becomes substantially uniform by disposing the cap member 3AA at a position that satisfies the condition of (Expression 1). In other words, the optical path length from the point light source 2 to the emission part is not less than the length corresponding to the half width of the directivity angle at which the intensity of the light emitted from the point light source 2 arranged at the arrangement pitch P is ½. Therefore, the light having an intensity of ½ from the adjacent point light sources becomes light that is mixed and mixed, and the illumination light whose light intensity is approximately the same level can be emitted.

  As described above, by making the cap member hollow, it is possible to make the light from the point light sources discretely arranged at a short distance uniform in the arrangement direction. In addition, since the optical path length from the light source to the cap member 3AA can be shortened, the vertical length for guiding the light can be reduced and compact when mounted on the end of the shelf, and the price attached to the shelf It can be configured with a width substantially the same as the width of the rail, and does not obstruct the purchaser's observation, and is also preferable as a suitable shelf lighting device when considering the design of the showcase.

  Moreover, it is preferable that the angle θ2 formed by the direction guided through the light guide path and the perpendicular of the emission surface 32AA is larger than the Brewster angle. Of the first and second reflecting surfaces facing each other, the height of the reflecting surface on the viewer side is made higher than the height of the product-side reflecting surface, and the cap member 3AA is tilted at an angle equal to or greater than the Brewster angle. The light emitted from the cap member 3AA upon hitting the reflection surface on the side is emitted toward the product side.

  In addition, the light beam that hits the reflection surface on the product side and the light beam that directly enters the cap member without hitting the reflection surface enters the exit surface at an angle larger than the Brewster angle. The illumination light emitted to the viewer can be made larger than the illumination light emitted to the viewer side, not only can the product be illuminated efficiently, but also the glare when the viewer observes the product Is preferable.

  As can be seen from the relationship between the incident angle and the reflectance of Fresnel reflection shown in FIG. 13, the light incident on the medium having a refractive index of 1.5 has an incident angle larger than about 60 °, that is, This is because the reflectivity increases abruptly when it becomes larger than the Brewster angle (about 60 °). FIG. 13 shows the reflectivity of p-wave (p reflectivity) and the reflectivity of s-wave (s reflectivity) incident on a medium having a refractive index n = 1.5, and the average reflectivity thereof.

  On the other hand, in the illuminating device that is attached to the front end of the shelf board and illuminates mainly the face of the product toward the upper side of the shelf, the light distribution center of the illumination light is tilted slightly toward the shelf board from directly above It is desirable that When the illumination light is emitted to the observer side from directly above, the observer cannot observe the product well because the illumination light is dazzling. In addition, if the light distribution center is greatly inclined toward the shelf, only the lower part of the product is illuminated brightly, and it is difficult to illuminate the entire face surface uniformly and satisfactorily.

  In the cap member 3AA of the present embodiment, the incident surface 31AA and the exit surface 32AA are parallel, and the tilt angle θ2 with respect to the light guide direction of the exit surface 32AA is about 65 °, so the tilt angle θ3 of the entrance surface 31AA is also about. 65 °. That is, strong light that has directly reached the cap member 3AA directly upward from the point light source 2 is incident on the cap member 3AA (incident surface 31AA) at an incident angle of 65 °, and the cap member 3AA at an exit angle of 65 °. Injected from (exit surface 32AA).

  Light incident on the cap member 3AA at an incident angle of 65 ° or more including light that has directly reached the cap member 3AA from the point light source 2 is reflected at a reflectance corresponding to each incident angle and returned to the optical path. The light incident on the cap member 3AA at an angle equal to or smaller than the Brewster angle is refracted by the incident surface 31AA and the exit surface 32AA without being substantially reflected, and is emitted to the shelf side.

  The inclination of the cap member 3AA is determined by the heights of the first reflection surface 11 and the second reflection surface 12 to which the cap member 3AA is attached. Accordingly, the upper end portion of the second reflecting surface 12AA is higher than the upper end portion of the first reflecting surface 11AA on the shelf board side. Most of the light guided to the cap member 3AA while being reflected between the opposing reflecting surfaces is reflected by the second reflecting surface 12AA immediately before being emitted from the cap member 3AA, and the inclination to the shelf side is caused. In this state, the light is incident on the cap incident surface and is emitted upward from the shelf.

  A radiance characteristic of the shelf illuminating device 1AA including the cap member 3AA having such a configuration will be described with reference to FIG.

  The horizontal axis shown in the figure indicates a radiation angle θA in which the direction directly above the light guide is 0 ° and the clockwise angle toward the shelf plate is a positive direction. Therefore, 0 ° is directly above, 90 ° is parallel to the shelf, and a negative angle means light emitted toward the viewer. From this figure, it can be seen that the light distribution characteristic has a first luminance peak R1 at a position of 5 ° and a second luminance peak R2 near 30 °.

  That is, it can be seen that the shelf illuminating device 1AA according to the present embodiment can satisfactorily illuminate the face of the product displayed on the shelf up to the top. In addition, since there is almost no illumination light emitted at a particularly low angle to the observer, the observer can observe the product comfortably without being dazzled.

  Next, the shelf illuminating device 1BA of the second embodiment will be described with reference to FIG.

  The shelf illuminating device 1BA is different from the shelf illuminating device 1AA described above in that a wedge-shaped cap member 3BA is provided instead of the parallel plate-shaped cap member 3AA included in the shelf illuminating device 1AA. Other configurations are the same as those of the shelf illuminating device 1AA and will not be described in detail here.

  The wedge-shaped cap member 3BA means that the inclination angle of the incident surface 31BA is different from the inclination angle of the exit surface 32BA. In this embodiment, the incident surface 31BA has an inclination angle θ3b of 55 °, and the exit surface 32BA. Is set to 30 °. That is, it has a wedge-shaped cross section in which the inclination of the exit surface is smaller than the inclination of the entrance surface.

  Therefore, light emitted from the point light source 2 that goes directly above with the highest luminance reaches the incident surface 31BA of the cap member 3BA directly without hitting the first and second reflecting surfaces, and is wedge-shaped. It is bent and ejected to the shelf side through the cap member 3BA.

  The radiance characteristics of the shelf illuminating device 1BA including the cap member 3BA having such a configuration will be described with reference to FIG. The illumination light with the highest luminance has a luminance peak R3 at a position inclined by about 20 ° from directly above to the shelf side. Accordingly, it is possible to provide an illumination device that is light-distributed and controlled so that the face surface of the product can be illuminated uniformly and satisfactorily upward.

  Further, it is possible to provide a diffusing portion for diffusing light in a predetermined angle range on a predetermined surface to generate more uniform planar illumination light. For example, the diffusion portion 14 having a predetermined scattering characteristic (for example, a Gaussian scattering characteristic of σ15 °) is provided on the incident surface 31BA in the longitudinal direction in which the plurality of point light sources 2 are arranged.

  With such a configuration, it is possible to scatter the illumination light spread substantially uniformly on the incident surface 31BA of the cap member 3BA, and create a substantially uniform planar secondary light source in the arrangement direction of the point light sources 2. Therefore, even if the surface state of the product displayed on the shelf is a glossy surface or a mirror surface, the observer moves and the observation position is changed without observing the point light source through the product surface. It is possible to provide a good lighting device that does not cause glare when moved.

  Moreover, it is possible to secure the optical path length from the light source to the exit surface by using the L-shaped light guide path. For example, as shown in FIG. 17, it has the light guide path | route 10CA which has an incident light guide path orthogonal to the light guide path | route formed with 1st reflective surface 11CA and 2nd reflective surface 12CA, and becomes a cross-section L type | mold. Let it be a shelf lighting apparatus 1CA of a modified example.

  In this shelf illuminating device 1CA, a substrate 21 is disposed so as to emit the point light source 2 toward the observer, and reflection surfaces 17 (17a, 17b) are provided on both upper and lower sides sandwiching the point light source 2. An incident light guide path is formed. Further, an inclined reflecting surface 15CA having an inclination of 45 ° for reflecting light from the point light source 2 in a direction toward the cap member 3CA is provided.

  With such a configuration, the light guide path can be folded into an L shape, the vertical width of the lighting device can be further reduced, and further downsizing can be achieved. Therefore, the shelf board illumination device 1CA is effective when the vertical width of the shelf board is small and thin.

  Next, a shelf illuminating device 1DA according to a third embodiment equipped with cap members having different shapes will be described with reference to FIG.

  This shelf illuminating device 1DA is different in that it has a triangular or trapezoidal cap member 3DA in place of the parallel plate-shaped cap member 3AA included in the shelf illuminator 1AA described above. Other configurations are the same as those of the shelf illuminating device 1AA and will not be described in detail here.

  The cap member 3DA has a third surface 33DA along the second reflecting surface 12DA in addition to the entrance surface 31DA and the exit surface 32DA. In the present embodiment, the incident surface 31DA is set to be horizontal with an inclination angle θ3d of 0 °, and the inclination angle θ2d of the exit surface 32DA is set to 65 ° as with the cap member 3AA. In other words, the light once reflected by the emission surface 32DA toward the third surface 33DA is reflected by the second reflection surface 12DA behind the third surface 33DA and is incident again into the cap member 3DA. Eject from 32DA.

  Accordingly, the light from the point light source 2 is guided directly or while being reflected by the first and second reflecting surfaces, and reaches the incident surface 31DA of the cap member 3DA. Most of the light that has entered the cap member 3DA is totally reflected at the exit surface 32DA toward the third surface 33DA. The light transmitted through the third surface 33DA is reflected by the second reflecting surface 12DA, then enters the cap member from the third surface 33DA, and is refracted and emitted from the exit surface 32DA.

  A radiance characteristic of the shelf illuminating device 1DA including the cap member 3DA having such a configuration will be described with reference to FIG. This luminance characteristic is different from the luminance characteristics of the cap members 3AA to 3CA described above, and it can be seen that the luminance peak has a luminance peak R4 in a direction inclined about 55 ° from the directly above direction to the shelf side. This is because when a thin product such as ham is stacked and displayed on a shelf, the height of the product is low, so the light distribution characteristic of the lighting device placed at the top of the shelf is in the direction toward the back of the shelf. It is desirable to have a luminance peak, and this embodiment can provide a lighting device suitable for such a display state.

  Here, the third surface 33DA has a Gaussian scattering characteristic of σ15 ° in the arrangement direction of the point light sources 2 (longitudinal direction of the shelf illumination device), and a direction (shelf illumination device) orthogonal to the arrangement direction. A fine structure as a scattering surface having a Gaussian scattering characteristic of σ1 ° is formed in the upper and lower width directions). That is, the diffusion part 14 is provided on the third surface 33DA. The fine structure forming the diffusion portion 14 can be integrally formed when the cap member is molded.

  Thus, by increasing the diffusion characteristics in the arrangement direction of the point light sources, the third surface 33DA becomes a planar secondary light source, and shelves the products having a surface with a low diffusion characteristic (a surface that easily reflects). Even if it is displayed on the top, the glare of illumination can be suppressed without observing a point light source through the surface of the product. In addition, by reducing the diffusion angle in the vertical direction of the shelf illuminating device, it is possible to provide an illuminating device in which light distribution is efficiently controlled while suppressing the spread of illumination light more than necessary.

  Moreover, since it is also possible to illuminate the vertical direction of a shelf simultaneously using the shelf illuminating device which can respectively guide the light which the point light source 2 emits up and down, about this specific structure, FIG. Each will be described with reference to FIG. 20D.

  First, the shelf board lighting device 1EA of the fourth embodiment will be described with reference to FIG. 20A.

  The shelf illuminating device 1EA includes, for example, a light guide path (first light guide path 10EAa) directed upward and a light guide path (second light guide path 10EAb) directed downward. In addition, a first cap member 3EAa is provided at the exit portion of the first light guide path 10EAa, and a second cap member 3EAb is provided at the exit portion of the second light guide path 10EAb. The point light source 2 is disposed at an intermediate portion of these first and second light guide paths, and the light emitting portion thereof is emitted toward the observer side, that is, toward the second reflecting surface 12EA. Has been placed.

  The second reflecting surface 12EA provided to face the point light source 2 has a size enough to cover the upper and lower light guide paths, and the light emitted from the point light source 2 is the second reflecting surface that faces the second reflecting surface 12EA. The light is reflected by 12EA and branched into a first light guide path 10EAa and a second light guide path 10EAb, respectively. In the first light guide path 10EAa, the light is guided to the cap member 3EAa while being reflected by the first reflective surface 11EA (first upper reflective surface 11EAa) and the second reflective surface 12EA, and in the second light guide path 10EAb, The light is guided to the cap member 3EAb while being reflected by the first reflective surface 11EA (first lower reflective surface 11EAb) and the second reflective surface 12EA.

  That is, the light guide path of the shelf illuminating device 1EA has a first light guide path 10EAa and a second light guide path 10EAb for branching and guiding the light from the point light source 2 in two different directions. Both the first and second reflecting surfaces and the cap member are provided in the light guide path. Moreover, it is preferable that the shortest optical path length to the incident surface which each cap member has is the optical path length L1 mentioned above in which the light whose intensity becomes 1/2 is mixed. With this configuration, for example, simultaneously performing upward illumination that illuminates the front of the product displayed on the upper surface side of the shelf and downward illumination that illuminates the top of the product displayed on the lower shelf, In addition, it is possible to reduce the luminance unevenness caused by the discrete arrangement and realize a lighting device with uniform luminance.

  Further, the second cap member 3EAb disposed in the emitting portion for emitting the light from the point light source 2 to the lower side may be a parallel plate disposed horizontally as shown in the figure, An inclined parallel plate or a wedge shape having an exit surface that injects in the product direction may be used, and a cap member that can effectively illuminate a desired region under the shelf can be used.

  In the case of the second cap member 3EAb composed of parallel flat plates arranged horizontally as shown in the figure, the light distribution control is performed so that the luminance center is directly under the shelf board and the front and rear are illuminated in a balanced manner. Can do.

  The second reflecting surface 12EA facing the point light source 2 is preferably a reflecting surface having scattering characteristics (for example, Gaussian scattering characteristics of σ15 °) that scatter at a predetermined angle. That is, it is preferable to provide the diffusing portion 14 on the second reflecting surface 12EA. If it is this structure, the light radiate | emitted from the point light source 2 will be diffusely reflected by the 2nd reflective surface 12EA, will be divided | segmented up and down, and will be guided toward the cap member each arrange | positioned at the injection | emission part.

  The second cap member 3EAb on the lower side is not subjected to light distribution control so as to go in the product direction, but is effective in preventing intrusion of dust, dust and moisture in the light guide path.

  That is, this light guide path has a first light guide path 10EAa and a second light guide path 10EAb that branch and guide the light from the point light source 2 in two different directions. The first and second reflecting surfaces are provided, the cap member 3EAa inclined to be emitted toward the product side is provided in one of the light guide paths, and the exit surface orthogonal to the light guide path is provided in the other light guide path. The second cap member 3EAb is provided, and the shortest optical path length to the incident surface of each cap member is L1. If it is such a structure, for example, when illuminating the lower side of the shelf with the shelf illuminating device 1EA attached thereto, illumination that emits illumination light directly downward through the second cap member 3EAb It is preferable that the apparatus can be realized.

  Next, the shelf illuminating device 1FA of the fifth embodiment will be described with reference to FIG. 20B.

  The shelf illuminating device 1FA includes a first light guide path 10FAa and a second light guide path 10FAb that are vertically branched in the same manner as the shelf illuminator 1EA described above. However, the difference is that a light beam branching portion 16 for efficiently branching the light emitted from the point light source 2 is provided at a portion facing the point light source 2. Other configurations are the same and will not be described in detail here.

  The light beam branching section 16 has a cross-sectional mountain shape including a first inclined reflecting surface 16a inclined upward by 45 ° and a second inclined reflecting surface 16b inclined downward by 45 ° in order to efficiently split the light beam vertically. Is done. For this purpose, the light emitted from the point light source 2 and reflected upward by the first inclined reflection surface 16a is guided through the first light guide path 10FAa toward the upper side and is arranged in a predetermined direction from the upper cap member 3FAa. Light is controlled and emitted. Moreover, the light reflected downward by the second inclined reflecting surface 16b out of the light emitted from the point light source 2 is guided through the second light guide path 10FAb toward the lower side and from the second cap member 3FAb on the lower side. The light is controlled in a predetermined direction and emitted.

  In the first light guide path 10FAa, the light is guided to the cap member 3FAa while being reflected by the second reflective surface 12FA and the first reflective surface 11FA (first upper reflective surface 11FAa). In the second light guide path 10FAb, The light is guided to the cap member 3FAb while being reflected by the first reflective surface 11FA (first lower reflective surface 11FAb) and the second reflective surface 12FA.

  Here, the cap member 3FAa used for the upper side illumination has, for example, a wedge shape as shown in the figure, and light distribution is controlled as illumination light directed toward the product direction. In addition, the incident surface 31FAa of the cap member 3FAa is a transmission surface having scattering characteristics (for example, Gaussian scattering characteristics of σ15 °) that scatter at a predetermined angle. That is, when the diffuser 14 is provided on the incident surface 31FAa, a planar secondary light source capable of emitting uniform light can be formed. Illumination light emitted from the exit surface of the cap member 3FAa is light-distributed so as to have a luminance peak in a direction from directly above to the product displayed on the shelf board.

  The second cap member 3FAb used for the lower illumination is made of, for example, parallel flat plates as shown in the figure, has a luminance center directly under the shelf, and illuminates the front and rear in a balanced manner. Perform light distribution control. The exit surface 32FAb of the second cap member 3FAb is a transmission surface having scattering characteristics (for example, Gaussian scattering characteristics of σ15 °) that scatter at a predetermined angle. That is, it is preferable to provide the diffusing portion 14 on the emission surface 32FAb because a planar secondary light source capable of emitting uniform light can be formed.

  That is, this shelf illuminating device 1FA provides the point light source 2 at a position orthogonal to the upper and lower first and second light guide paths, and branches the light from the point light source 2 to the first and second light guide paths. The light beam branching portion 16 is provided. With this configuration, light from one point light source 2 can be efficiently guided to the first and second light guide paths via the light beam branching portion 16. For example, the upper and lower sides of the shelf plate can be made uniform at the same time. An illuminating device capable of illuminating can be realized, which is preferable.

  When the cap member is molded, the diffusion transmission surface having the scattering characteristic that scatters at the predetermined angle described above can be integrally molded. Moreover, it is good also as a structure which affixes the diffusion sheet and diffusion film which have a predetermined scattering characteristic to a predetermined surface.

  Next, the shelf illuminating device 1GA of the sixth embodiment will be described with reference to FIG. 20C.

  This shelf illuminating device 1GA includes a first light guide path 10GAa and a second light guide path 10GAb that are vertically branched in the same manner as the shelf illuminator 1EA described above. Further, since the light beam branching portion 16 for efficiently branching the light emitted from the point light source 2 is provided at a portion facing the point light source 2, it is the same as the shelf illuminating device 1FA described above. Not detailed. However, in order to efficiently guide the light emitted from the point light source 2 to the light beam branching portion 16, the difference is that incident reflection surfaces 17 are provided on both upper and lower sides sandwiching the point light source 2.

  The incident reflection surface 17 includes an upper incident reflection surface 17a and a lower incident reflection surface 17b. Of the light emitted from the point light source 2, light directed toward the reflection surface is efficiently reflected toward the light beam branching section 16. To do. That is, the light from the point light source 2 directly strikes the light beam branching portion 16 provided at the opposite portion and is branched while being reflected by the upper and lower reflecting surfaces and guided by the light beam branching portion 16. The reflected light beam and the light beam reflected by the upper and lower reflecting surfaces and then directly reflected by the second reflecting surface 12GA and directed to the upper and lower cap incident surfaces are combined and emitted from the cap exit surface.

  In this embodiment, both the cap member 3GAa used for the upper side illumination and the cap member 3GAb used for the lower side both use translucent members made of parallel plates. In both cases, the incident surface is a transmission surface having scattering characteristics (for example, Gaussian scattering characteristics of σ15 °) that scatter at a predetermined angle. In other words, the diffusion portion 14 is provided on the incident surface of the cap material.

  If it is the structure provided with the incident reflective surface 17, the upper and lower widths of the first reflective surface 11GA (11GAa, 11GAb) and the second reflective surface 12GA can be increased by adding the reflective surfaces 17 facing each other with the point light source 2 interposed therebetween. Even if it is short, the optical path length from the light source to the emission part can be increased. That is, even if the vertical width of the shelf illuminating device 1GA is small, it is possible to ensure an optical path length that uniformly mixes the light emitted from the adjacent point light sources 2, and both the upper side illumination and the lower side illumination are point light sources 2. It is possible to realize a good lighting device without any unevenness in the arrangement direction.

  That is, the shelf illuminating device 1GA is provided with an incident light guide path 10GAc that guides light from the point light source 2 to the branching portion 16, and third reflecting surfaces on both sides of the incident light guide path 10GAc with the point light source 2 interposed therebetween. (Upper incident reflective surface 17a) and a fourth reflective surface (lower incident reflective surface 17b) are provided. If it is this structure, by taking the optical path length to the branch part 16, the width | variety of the optical path equivalent to the up-and-down width of a shelf board can be made small, Furthermore, it becomes possible to achieve size reduction of an illuminating device, and it is preferable. .

  Next, the shelf illuminating device 1HA of the seventh embodiment will be described with reference to FIG. 20D.

  This shelf illuminator 1HA has a first light guide path 10HAa and a second light guide path 10HAb that are branched up and down, has a light beam branching portion 16, and is dotted like the shelf illuminator 1GA described above. Incident reflection surfaces are provided on both upper and lower sides of the light source 2. However, the difference is that the cap member 3HAb used for the lower illumination has the trapezoidal shape having the third surface described above. Another difference is that a diffusing portion 14 is provided on the first reflecting surface 11HA (11HAa, 11HAb) and the second reflecting surface 12HA forming the light guide path in the vertical direction to form a diffusing reflecting surface.

  For example, the cap member 3HAa used for the upper illumination is made of a light-transmitting member made of a parallel plate or a slightly inclined wedge shape, and is inclined from 15 ° to 20 ° on the product side of the shelf board from directly above. The light distribution is controlled so as to have a luminance peak in a different direction. Further, the lower illumination uses the second cap member 3HAb having the third surface to control light distribution so as to have a luminance peak in a direction inclined by 60 ° from directly below in the shelf direction.

  Further, the first reflecting surface 11HA (the first upper reflecting surface 11HAa and the first lower reflecting surface 11HAb) and the second reflecting surface 12HA are scattered at a predetermined angle, for example, as a diffuse reflecting surface obtained by white coating on a metal surface. The reflecting surface has scattering characteristics (for example, Gaussian scattering characteristics of σ10 °).

  With such a configuration, the upper illumination can uniformly and satisfactorily illuminate the product face. Further, the lower illumination can illuminate a wide range up to the back of the shelf. Therefore, by arranging a plurality of shelves to which the shelf lighting device 1HA according to the present embodiment is installed, in all shelves, products arranged on the face of the merchandise displayed at the top of the shelves and the back of the shelves Both can be well illuminated, and the observer (customer) can observe and select the product satisfactorily with no shadow on the product surface.

  The cap member (3AA to 3HA) is made of a transparent body having a refractive index of 1 or more as described above. In this embodiment, it is made of PMMA having a refractive index of about 1.5, but a translucent member made of a material other than this may be used, and a transparent resin such as a glass material or acrylic or polycarbonate other than PMMA depending on the application. May be used.

  Moreover, the diffusion part 14 which scatters the light which the point light source 2 radiates | emits to the predetermined angle range can be provided in the emission surface of a cap member, for example. With this configuration, by making the surface farthest from the light source a diffusion surface, the optical path length between the light source and the diffusion surface can be ensured to the maximum, and even when using discretely arranged point light sources, it is compact. Nevertheless, a lighting device with uniform brightness can be realized.

  Further, the diffusing portion 14 may be provided on the incident surface of the cap member. With this configuration, the outer surface is a flat exit surface, and the incident surface is diffused so that the outer surface is flat and hardly contaminated. Cleaning is also easy. Further, by making the incident surface arranged in the vicinity of the exit surface a diffusing surface, it is possible to realize a lighting device that is small in size but uniform in brightness even if discretely arranged point light sources are used. it can.

  Moreover, you may form the diffusion part 14 by making the 1st reflective surface and 2nd reflective surface which form a light guide path into a diffused surface, and if it is this structure, by diffusing while guiding light, of a point light source After making the luminance unevenness in the arrangement direction, the light distribution is controlled by refraction on each surface of the cap member, and a lighting device that can efficiently illuminate the product with uniform luminance in the arrangement direction of the point light sources can be realized. it can.

  Moreover, you may provide the diffusion part 14 by making the 3rd surface of a cap member into a diffusion surface, and if it is this structure, an illumination surface will be efficiently made into a 3rd surface by making an incident surface and an output surface into a plane. Then, an illumination device capable of controlling light distribution as illumination light with uniform luminance can be realized.

  Moreover, it is preferable that the spreading | diffusion characteristic with which these spreading | diffusion parts 14 are provided has a large diffusivity of a point light source arrangement direction compared with the diffusivity of the direction orthogonal to a point light source arrangement direction. With such a configuration, it is greatly diffused in the direction in which a plurality of point light sources are arranged, and even when the point light sources arranged in a discrete manner are used, luminance unevenness caused by the discrete arrangement is reduced. Thus, a lighting device with uniform brightness can be realized.

  In addition, it is preferable that such diffusion characteristics have a diffusion degree within a predetermined angle range in the point light source arrangement direction. With such a configuration, while maintaining the effect of light distribution control in the direction orthogonal to the point light source arrangement direction, the light is greatly diffused in the direction in which the plurality of point light sources are arranged, and is arranged discretely. Even if a point light source is used, it is possible to reduce the luminance unevenness caused by the discrete arrangement and realize a lighting device with uniform luminance.

  Next, a shelf unit provided with the shelf illumination devices 1AA to 1HA described above will be described with reference to FIGS.

  FIG. 21 shows a shelf board unit 50 including a shelf board illumination device (for example, 1AA) that illuminates the upper part of the shelf board 5. This shelf board lighting device 1AA is provided between the front end 5a of the shelf board 5 and the price rail 4 attached to the shelf board.

  Thus, by setting it as the unit structure which attached and integrated shelf board illuminating device 1AA to the shelf board 5, after installing a shelf board in a showcase main body, the effort which attaches a shelf illuminating apparatus can be saved. Since the shelf illuminating device 1AA according to the present embodiment is small in both thickness and vertical width and can be configured to be lightweight, it is preferable because it is easy to handle as the shelf unit 50 integrated with the shelf in advance.

  The point light sources 2 are arranged on a single substrate 21 at approximately equal intervals, and electrical components for a drive circuit are also installed on the same substrate 21. Further, power supply wiring is connected to the electrical component. For example, this wiring is fixed to the back side of the shelf up to the shelf main body mounting portion, and is connected to the main body power supply wiring and the connector at the shelf mounting portion.

  In addition, as shown in FIG. 22, if the shelf unit 50A is equipped with a shelf illuminating device (for example, 1HA) that simultaneously illuminates the top and bottom of the shelf, it is easy to observe by illuminating the face and top of the product M1 simultaneously. Therefore, the product M1 displayed on the shelf board 5 can be illuminated with high quality, which is preferable.

  In particular, if the shelf lighting device 1HA described above is used, the light distribution center of the illumination light of the lower illumination can be tilted to the back of the shelf, and the interior of the shelf can be well illuminated. Even after the product is sold, the products on the back side can be observed well, which is preferable.

  As described above, if the shelf unit 50 or 50A is provided with the shelf illumination devices (1AA to 1HA) at the tip, the products displayed on the shelf can be illuminated with high quality. Moreover, if it is a showcase with a plurality of such shelf units, the products on the shelf can be efficiently illuminated with a small number of point light sources to reduce the glare when the observer observes the products. By using the shelf unit equipped with the shelf illumination device, it is preferable that a showcase capable of illuminating the products displayed on the shelf with a uniform luminance can be obtained.

  For example, as shown in FIG. 23, a showcase SC having a configuration in which a plurality of shelves 50A are integrated with a shelf 5 and a shelf illuminating device (for example, 1HA) are integrated.

  Since the shelf lighting devices 1AA to 1HA (for example, 1HA) have a compact configuration and can have a small vertical width, an observer (a purchaser of the product) can observe the front of the product well without being obstructed by the lighting device. it can. Further, even a tall product can be satisfactorily observed up to the face of the product, particularly the lower side, by using an illumination device that illuminates upward from the front end of the shelf board. Furthermore, by using an illuminating device that illuminates up and down from the front end of the shelf plate, it is possible to satisfactorily observe the face surface and upper side of the product.

  In particular, when the shelf lighting device 1HA described above is used, it is preferable to illuminate the interior of the shelf satisfactorily, so that even if tall products are displayed, the products on the back side can be observed well.

  Since the surface of the object to be illuminated is often arranged near the exit surface, the upper illumination is required to illuminate in a wide range. On the other hand, the lower illumination illuminates the upper part of the object placed on the shelf below the shelf to which the shelf illuminating device is attached, and therefore often has a distance from the object to be illuminated. Therefore, by tilting the light distribution center of the lower illumination to the rear side, it becomes possible to illuminate the objects arranged to the back of the shelf board from the upper side. In other words, the object surface can be illuminated from the front and simultaneously from the top to the back, so that products placed on the shelf can be easily observed.

  By providing a diffusing portion 14 that diffuses a reflecting surface, an incident surface, or an exit surface that forms a light guide path into a predetermined angle range, color unevenness or illuminance of a plurality of point light sources (LED light sources) Unevenness can be improved and a more uniform high-quality shelf lighting device can be realized.

  That is, by providing the diffusion unit 14 having a predetermined diffusion characteristic on a predetermined surface, light diffused and reflected in a predetermined angle range is guided to the emission surface, and illumination light with reduced color unevenness and illuminance unevenness is emitted. It becomes possible. As described above, it is preferable to provide the diffusing section 14 that emits the incident light while diffusing the incident light in a predetermined angle range at a predetermined portion. With such a configuration, since the light diffused in the predetermined angle range is emitted from the emission surface, it is possible to emit illumination light with improved illuminance unevenness and color unevenness.

  As described above, since the shelf illuminating device according to the present embodiment uses the air layer as a light guide path, it has a large light distribution angle and is preferable because light from adjacent point light sources is mixed at a short distance. In addition, since the light beams from the adjacent point light sources overlap each other at the position of the exit surface of the cap member with respect to the longitudinal direction of the shelf plate, uniform illumination in the longitudinal direction is possible.

  In addition, the optical path length from the point light source to the emission part is set to a length corresponding to the half-width of the directivity angle at which the intensity of light emitted from the point light source arranged at the arrangement pitch P is ½. Therefore, it is possible to emit the illumination light whose intensity is approximately the same level from the emission unit by mixing light of intensity 1/2 from adjacent point light sources.

  Therefore, a shelf illuminating device that can be made compact and can effectively illuminate a predetermined range is preferable. Moreover, if it is a shelf board unit of the structure which integrated the shelf board and the shelf illuminating lamp position, handling will become easy and it is preferable. Moreover, if it is a showcase which provided this shelf board unit in multiple steps up and down, since the goods displayed on the shelf board can be illuminated uniformly from the upper and lower sides of a shelf board, it is preferable.

  In addition, since the LED light source is used as the point light source, a highly efficient shelf illuminating device can be realized using an LED light source with high illuminance, low power consumption, and low heat generation.

  As described above, the shelf illuminating device according to the present invention guides light through a hollow light guide path and emits uniform illumination light in the longitudinal direction having a luminance peak in a predetermined direction. Nevertheless, it is possible to efficiently illuminate the products on the shelf, and at the same time, it is possible to provide an illumination device that is optimal for a showcase in which the viewer is not dazzled.

  The illuminating device and the shelf illuminating device according to the present invention can be suitably applied to an illuminating device used for a multistage showcase having a plurality of shelf plates above and below.

1A-1G Illumination device 1AA-1HA Shelf illumination device 2 Point light source (LED light source)
3, 3A-3C Light guide element 3AA-3HAb Cap member 5 Shelf 10A-10G Light guide path 11, 11B-11G, 11AA-11HAb First reflective surface 12, 12B-12G, 12AA-12HA Second reflective surface 13, 13B, 13C Emitting surface 14 Diffusing portion, Anisotropic diffusing portion 15 Branch reflecting surface 16 Light beam branching portion 17 Incident reflecting surface (up and down sandwiching point light source)
30 exit portion 31 entrance surface 32 exit surface 33 first reflection surface 33DA third surface 34 second reflection surface 50, 50A shelf unit R1-R4 luminance peak R, Ra, Rb luminance SC showcase

Claims (31)

A plurality of point light sources arranged at intervals in a predetermined direction, a light guide path for guiding light emitted from the light source in a direction orthogonal to the predetermined direction, and the guided light in a predetermined direction And an illumination optical system comprising:
The light guide path is constituted by first and second reflecting surfaces facing each other with an air layer interposed therebetween, and the emission part is constituted by a cap member having an incident surface and an emission surface,
The illumination device characterized in that light beams from adjacent light sources of the point light sources overlap each other at the position of the exit surface. When the shortest optical path length from the point light source to the incident surface is L1, the arrangement pitch of the point light sources is P, and the half angle width of the point light source is θ1,
L1> P / 2 tan θ1 (Formula 1)
The lighting device according to claim 1, wherein: 3. The illumination device according to claim 1, wherein an angle θ <b> 2 formed by a direction guided through the light guide path and a perpendicular of the emission surface is set to be larger than a Brewster angle. The lighting device according to claim 3, wherein an angle θ3 formed by a direction guided through the light guide path and a perpendicular to the incident surface is set to be larger than the angle θ2. An angle θ3 formed by a direction guided through the light guide path and a perpendicular to the incident surface is set to be smaller than the angle θ2, and the cap member is added to the incident surface and the exit surface. A third surface, and light incident from the incident surface is totally reflected by the exit surface, travels toward the third surface, and is reflected by a reflective portion provided on the third surface side, and then the exit surface. The illumination device according to claim 3, wherein the illumination device emits light from a surface. 6. The illumination device according to claim 1, wherein a diffusion portion having a predetermined diffusion characteristic is provided on the emission surface. 6. The illumination device according to claim 1, wherein a diffusion portion having a predetermined diffusion characteristic is provided on the incident surface. The lighting device according to claim 1, wherein a diffusion portion having a predetermined diffusion characteristic is provided on the second reflecting surface. The lighting device according to claim 5, wherein a diffusion portion having a predetermined diffusion characteristic is provided on the third surface. The illumination according to any one of claims 6 to 9, wherein the diffusion characteristic is such that a diffusivity in the point light source array direction is larger than a diffusivity in a direction orthogonal to the point light source array direction. apparatus. The lighting device according to claim 6, wherein the diffusion characteristic has a diffusion degree in a predetermined angle range in the point light source arrangement direction. The light guide path has a first light guide path and a second light guide path for branching and guiding light from the point light source in two different directions. The lighting device according to claim 2 , wherein the second reflection surface and the cap member are both provided, and the shortest optical path length to the incident surface of each cap member is L1. The light guide path has a first light guide path and a second light guide path for branching and guiding light from the point light source in two different directions. A second reflecting surface is provided, the cap member is provided in one of the light guide paths, and a second cap member having an exit surface orthogonal to the light guide path is provided in the other light guide path, and each cap member is provided. The illuminating device according to claim 2 , wherein a shortest optical path length to the incident surface of the light source is L1. 13. The point light source is provided at a position orthogonal to the light guide path, and a light beam branching part for branching light from the point light source to the first and second light guide paths is provided. Or the illuminating device of 13. An incident light guide path for guiding light from the point light source to the branching portion is provided, and third and fourth reflection surfaces are provided on both sides of the incident light guide path across the point light source. The lighting device according to claim 14. The lighting device according to claim 1, wherein the point light source is an LED light source. A shelf unit characterized in that the lighting device according to any one of claims 1 to 16 is provided at a tip portion. A showcase comprising a plurality of the shelf board units according to claim 17. An illumination device having a plurality of point light sources arranged at predetermined intervals, guiding light emitted from the point light sources to an emission unit through a light guide path, and emitting the illumination light from the emission unit There,
The light guide path is formed of a first reflection surface and a second reflection surface arranged to face each other, and is anisotropic to a predetermined portion separated by a predetermined optical path length according to the arrangement pitch of the point light sources. A diffusion unit is provided, and after the light beams of predetermined intensity portions of light emitted from the adjacent point light sources overlap, the light diffused by a predetermined angle in a predetermined direction is emitted,
The second reflection surface is a reflection surface on the side that reflects light emitted from the point light source toward the emission portion, and the anisotropic diffusion portion is provided on the second reflection surface. Lighting device. An illumination device having a plurality of point light sources arranged at predetermined intervals, guiding light emitted from the point light sources to an emission unit through a light guide path, and emitting the illumination light from the emission unit There,
The light guide path is formed of a first reflection surface and a second reflection surface arranged to face each other, and is anisotropic to a predetermined portion separated by a predetermined optical path length according to the arrangement pitch of the point light sources. A diffusion unit is provided, and after the light beams of predetermined intensity portions of light emitted from the adjacent point light sources overlap, the light diffused by a predetermined angle in a predetermined direction is emitted,
The light guide path has a first light guide path and a second light guide path for branching and guiding light from the point light source in two different directions, and each of the light guide paths has the first reflection A lighting device comprising a surface, the second reflecting surface, and the emitting portion. The illumination device according to claim 19 or 20, wherein the emission unit is an emission surface formed of a light-transmissive member. The illuminating device according to any one of claims 19 to 21, wherein the anisotropic diffusion unit has a larger diffusion characteristic in a longitudinal direction in which the point light source is disposed. The optical path length from the point light source to the anisotropic diffusion part is set so that light having an intensity of 30% or more from adjacent light sources overlaps the point light source. The lighting device according to any one of 22. When the shortest optical path length from the point light source to the anisotropic diffusion part is L1, the arrangement pitch of the point light sources is P, and the half angle width of the point light source is θ1,
L1> P / 2 tan θ1 (Formula 1)
The lighting device according to any one of claims 19 to 23, wherein: The lighting device according to claim 21 , wherein the anisotropic diffusion portion is provided on the exit surface. The lighting device according to any one of claims 19 to 24 , wherein the anisotropic diffusion portion is provided at a portion of the second reflecting surface facing the emission portion. 27. The illumination device according to claim 24, wherein the shortest optical path length L1 reaching the anisotropic diffusion portion is set to about the arrangement pitch P of the point light sources. The said 2nd reflective surface is installed so that the light beam reflected by this reflective surface may be piled up on the light beam directly guided to the said emission part from the said point light source, The any one of Claim 19 to 27 characterized by the above-mentioned. A lighting device according to claim 1. The light guide path is composed of a light guide element having a refractive index greater than 1, and an incident surface on which light emitted from the point light source is incident on the light guide element, an exit surface that emits a light beam, and the incident surface. 21. An opposite reflecting surface that guides an incident light beam to the exit surface, and the anisotropic diffusion portion is provided on at least one of the exit surface or the reflect surface. The lighting device described. A plurality of the point light sources are arranged in parallel at a predetermined interval, and have a long reflective surface and the exit surface along a longitudinal direction, and are installed along a front end portion of a shelf plate for displaying articles. The lighting device according to claim 29, wherein the lighting device is inclined toward a product displayed on the shelf board. The lighting device according to claim 30, wherein the shelf board is mounted on each shelf board of a showcase including a plurality of stages, and the top and bottom of the shelf board are illuminated simultaneously.