JP5944217B2 - Lighting device - Google Patents

Description

  The present invention relates to an illuminating device using an LED light source, and more particularly to an illuminating device that illuminates a semi-transparent shade using leakage light leaking from an LED light source directed to an irradiation target.

In showcases installed in supermarkets, convenience stores, etc., lighting devices are provided so as to illuminate the interior and the shade where products are displayed. In recent years, it has been attempted to use an LED light source instead of a fluorescent lamp as this type of lighting device from the viewpoint of energy saving. In the case of an LED light source, since the directivity is high, it is conceivable to arrange an LED light source that illuminates the shade and an LED light source that illuminates the interior of the cabinet.
In order to solve this problem, for example, an LED lighting device described in Patent Document 1 has been proposed. The illuminating device described in Patent Document 1 is an LED illuminating device to which a bidirectional lens is attached to illuminate both the interior and the shade with a directional LED light source. The LED light source is directed in two directions by a bidirectional lens, one is directed toward the reflector and reflected by the reflector, and the other is directed toward the interior. By directly irradiating the goods etc. in the store, both the shade and the store are illuminated.

JP 2010-88596 A

  By the way, if the amount of light from the LED illumination device is simply 2 minutes (shade side: inner side = 1: 1), the amount of light on the shade side becomes excessive in order to match the maximum required amount of light inside the original irradiation target. This wastes energy. When the light from the LED light source is divided into two directions using a bidirectional lens as in the LED lighting device described in Patent Document 1, the light amount is adjusted by using a dedicated lens having a different light amount ratio (shade side: storage Although it is possible to distribute the optimum light quantity to the shade side and the inside of the cabinet by the inside = 1: 2), it is necessary to design a dedicated lens having a different light quantity ratio depending on the showcase, resulting in an increase in cost.

  The present invention has been made paying attention to the above-mentioned problems, and by effectively using the leaked light leaking outside the irradiation light toward the irradiation target of the LED light source for illumination of the shade, both the irradiation target and the shade are appropriately used. An object of the present invention is to provide an illumination device that can illuminate with brightness.

Therefore, the lighting device of the present invention, there a L ED light source, a translucent shade arranged so as to cover the LED light source, a reflector disposed so as to face with the shade, with Ru illumination device comprising a Te, the LED light source, the distal end inside of the shade, is located toward the optical axis to the illumination target opposite to the shade side, the reflector, the leakage light leaking from the LED light source before Symbol shade It is characterized by being arranged so as to reflect toward the shade and to face the shade across the LED light source .

According to the lighting device of the present invention, the leakage light leaking from the LED light source arranged with the optical axis facing the illumination target on the side opposite to the shade side on the inner side of the front end portion of the shade is reflected toward the shade , and the LED Since the reflector is arranged so as to face the shade across the light source, the illumination target is illuminated with appropriate brightness by the direct light of the LED light source, and the LED light source that did not contribute to the illumination of the illumination target The shade can be illuminated with appropriate brightness using the leaked light. Therefore, the light use efficiency of the LED light source can be increased, and as a result, power saving can be achieved.

The perspective view which shows the example of the showcase to which one Embodiment of the illuminating device of this invention is applied. The side view of the showcase of FIG. The enlarged view of the A section of FIG. The block diagram of the illuminating device of embodiment same as the above. Explanatory drawing of the 1/2 beam angle in a LED light source. The figure which shows another example of a shape of a reflecting plate. The figure which shows another example of a shape of the reflecting plate following FIG. The figure which shows another embodiment of this invention. The figure which shows another structural example in the case of the LED light source with a bidirectional lens.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are diagrams showing an example of a showcase to which an embodiment of the lighting device of the present invention is applied. FIG. 1 is a perspective view, FIG. 2 is a side view of FIG. 1, and FIG. It is an enlarged view of a part.
The showcase 1 is an open type showcase that is installed in, for example, a supermarket or a convenience store and has an open front and side surfaces.

  As shown in the figure, the open showcase 1 includes a rectangular main body 5 having a ceiling portion 2, a back surface portion 3 and a bottom portion 4 and having an open front surface (customer side, sales floor side) and both side surfaces. A display chamber 6 is formed in a space between the ceiling portion 2 and the bottom portion 4 of the main body 5, and a plurality of display shelves 7 are installed on the inner panel 3 a of the back surface portion 3 via brackets 8 in the vertical direction. In the vicinity of both ends of the inner panel 3a of the back surface portion 3, a plurality of engagement holes 9 are formed in the vertical direction so that the base end of the bracket 8 can be freely attached and detached, according to the height of the product to be displayed. Thus, the position of the display shelf 7 can be changed.

  Although not shown, a cold air circulation duct is formed inside the ceiling portion 2, the back surface portion 3, and the bottom portion 4, and an evaporator of the refrigeration circuit and an evaporator fan are disposed in the cold air circulation duct of the bottom portion 4. The condenser of the refrigeration circuit, the condenser fan, the compressor, and the like are disposed in a separate machine room (not shown). A discharge port 10 opened downward for discharging cool air from the cold air circulation duct 5 is formed in the front portion of the ceiling portion 2, and a suction port 11 opened upward is formed in the front portion of the bottom portion 4. The cool air blown out from the discharge port 10 is taken into the cool air circulation duct from the suction port 11 to form a cool air curtain in the front opening of the display chamber 6.

  As shown in FIG. 3, a shade 12 made of a translucent plate curved in a convex shape on the front side (customer side, sales floor side) is attached to the front end of the outer panel 2 a of the ceiling portion 2. An LED light source 14 is attached to the inside of the tip of the shade 12 so as to be covered with the shade 12 via a bracket 13.

As shown in FIG. 4, the LED light source 14 has a light emitting part formed by aligning a plurality of LED elements 14B in the back direction of FIG. 4 with a predetermined interval on a substrate 14A, light transmissive (transparent or milky white) The lighting module is formed in a bar shape that is integrated with the cover 14C. The LED light source 14 is arranged with its optical axis (indicated by an arrow X in FIG. 4) directed toward a product group (not shown) on the front surface of the display chamber 6, which is an irradiation target opposite to the shade 12 side. . Specifically, the direct light in the range of 1/2 beam angle of the LED light source 14 (the angle at which the luminous intensity becomes 1/2 of the maximum luminous intensity) is a product on the front surface of the lighting plate 16 and the display chamber 6 as shown by hatching in FIG. It is arranged to irradiate. FIG. 5 shows an example of the directivity characteristic of the LED light source 14 and shows that the 1/2 beam angle in this case is 60 degrees.
The LED light source may be LED illumination that does not provide light distribution control means (light distribution control lens) and does not perform light distribution control such that the LED element is exposed. A light control lens may be provided to reduce the 1/2 beam angle of the LED light source.

  As shown in FIG. 4, the reflector 15 is disposed so as to face the shade 12 with the LED light source 14 interposed therebetween. The reflecting plate 15 is formed of, for example, a white fine-fired PET sheet having a reflecting surface with high reflectivity and diffuse reflectance, and hits the upper end portion of the illuminating plate 16 extending obliquely downward from the shade 12 side to the discharge port 10 side. It is attached in contact. In addition, as another example of a material which has a high reflectance and a diffuse reflectance and is suitable for the reflecting plate, for example, an acrylic material or a polycarbonate material can be given. Further, the reflecting plate 15 is bent in a polygonal shape, the upper end is in contact with the shade 12, and the lower end 15 a extends toward the LED light source 14 to the vicinity of the LED light source 14, and leaks from the LED light source 14. The light leaked by the thick arrow 4 is reflected toward the shade 12 without escaping outside. The reflector 15 is not limited to a finely fired PET sheet, and may be made of a metal such as stainless steel. In the case of metal, since it is close to specular reflection (or specular reflection), it is desirable to make the reflector shape closer to the curved surface shape (or to the curved surface shape) as described later. Here, the leakage light is light emitted outside the 1/2 light beam angle of the LED light source 14.

  Further, the reflection space of the reflected light reflected by the reflector 15 toward the shade 12, that is, the space between the shade 12 and the reflector 15 is closed by the panel 17 as shown in FIG. A substantially sealed space is provided so that the light reflected by the plate 15 does not leak from both sides of the reflection space. An ON / OFF switch 18 for the LED light source 14 is attached to the illumination plate 16. The side surface of the reflection space may be opened without attaching the panel 17.

  In the illuminating device of the present embodiment, as shown in FIG. 4, the optical axis X of the LED light source 14 is directed toward the illuminating plate 16 and the display chamber 6 of the showcase 1, and as shown in FIG. The front surface of the display room 6 of the showcase 1 is illuminated brightly by direct light irradiation of the LED light source 14. On the other hand, as shown by the thick arrows in FIG. 4, leakage light that leaks from the side of the LED light source 14 to the outside of the shaded area in FIG. 4 is reflected by the reflector 15 toward the shade 12 to illuminate the shade 12 brightly.

  Thus, according to the illuminating device of the present embodiment, the leakage light that has not conventionally contributed to the illumination on the display room 6 side of the showcase 1 that is the irradiation target is used for the illumination of the shade 12. The display room 6 side is illuminated with appropriate light by the direct light of the LED light source 14, and the shade 12 side can be illuminated with appropriate brightness by the leakage light of the LED light source 14 that has been radiated wastefully conventionally. Become. Moreover, since the shade 12 is illuminated with the reflected light reflected by the reflecting plate 15, the variation in the color of each LED element 14B of the LED light source 14 is alleviated, and the color unevenness of the shade 12 can be reduced.

In the said embodiment, although the shape of the reflecting plate 15 was made into polygonal shape, it cannot be overemphasized that it is not restricted to this shape. 6 and 7 show examples of various shapes of the reflecting plate 15.
The reflector 15 in FIG. 6A has a simple flat plate shape and hangs from the upper end of the shade 12 to the vicinity of the LED light source 14. The reflection plate 15 in FIG. 5B has a configuration in which the lower end portion 15a is bent toward the LED light source 14 in the flat plate shape of FIG. In such a configuration, a part of the light leaking in the direction of the irradiation plate 16 from between the LED light source 14 and the reflection plate 15 can be reflected to the shade 12 side as compared with the configuration of (A) simply drooping. In the reflecting plate 15 of FIG. 3C, the lower end portion 15a is further extended to be in contact with the cover 14C of the LED light source 14. In such a configuration, all of the light leaking from the side of the LED light source 14 toward the irradiation plate 16 can be reflected to the shade 12 side. FIG. 4D shows a configuration in which the position of the upper end portion of the reflecting plate 15 to be brought into contact with the shade 12 is positioned closer to the front side of the shade 12 than in the cases (A) to (C). In such a configuration, there is no need to irradiate the upper surface of the shade 12 with little need to illuminate, and therefore unnecessary irradiation of the reflector 15 can be eliminated.

The reflector 15 in FIG. 7E has a polygonal shape similar to that in the embodiment in FIG. 4 and has a configuration in which the lower end portion 15 a is in contact with the cover 14 </ b> C of the LED light source 14. The reflecting plate 15 in FIG. 7F has a configuration in which the lower end portion 15a is in contact with the cover 14C of the LED light source 14 as a curved surface convex to the side opposite to the shade 12 side. In such a configuration, even when a metal material having a specular reflection such as stainless steel is used as the reflecting plate 15, luminance unevenness of the shade 12 is hardly generated. The reflection plate 15 in FIG. 7G has a flat plate shape, and the lower end portion 15a of the reflection plate 15 reaches a position where a part of the irradiation light directed from the LED light source 14 toward the display chamber 6 can be reflected, that is, the LED light source. It is the structure extended to the position which overlaps with a part of 14 front surface. In such a configuration, since a part of the irradiation light directed toward the display chamber 6 side which is the irradiation target can be used as illumination light for the shade 12, the overlapping amount of the lower end portion 15a of the reflecting plate 15 which overlaps the front surface of the LED light source 14 It is possible to adjust the amount of light that irradiates the display chamber 6 side and the amount of light that irradiates the shade 12 side.
As shown in FIG. 7H, if the bent portion (B portion in the figure) of the illuminating plate 16 is bent at an obtuse angle, the bent portion of the illuminating plate 16 is also directly irradiated with light. Thus, it is possible to reduce the influence of the shadow on the bent portion. Reference numeral 13 ′ in the drawing denotes a bracket having a different shape from that for attaching the LED light source 14 to the shade 12.

FIG. 8 shows another embodiment of the present invention, and is an example in the case of an LED light source to which a bidirectional lens described in JP 2010-88596 A is attached.
In FIG. 8, the reflector 15 'arranged so as to conceal the LED light source 14' to which the bidirectional lens is attached faces the lower end 15a 'toward the LED light source 14'. It bends and extends toward the valley portion between the lenses in the bidirectional lens, and the upper end portion 15b is configured to abut on the upper end portion of the shade 12 '.

  In such a configuration, one of the lights of the LED light source 14 'directed in two directions by the bidirectional lens is directed to the reflecting plate 15' and reflected by the reflecting plate 15 'to illuminate the shade 12', and the other is an irradiation target. It is directed to the display room side of a showcase and directly illuminates the display room side. Further, the leakage light radiated to the inter-lens area of the bidirectional lens is reflected to the shade 12 'side by the bent lower end portion 15a of the reflecting plate 15'. Therefore, according to the present embodiment, since the reflected light of the leaked light can be used for the illumination of the shade 12 ′ in addition to the direct light from the LED light source 14 ′, the shade 12 ′ can be brightened. Further, if the shade 12 'has the same brightness as the conventional one, the amount of light directed from the reflecting plate 15' by the bidirectional lens can be suppressed, and the amount of light directed toward the display room can be increased accordingly. .

  FIG. 9 is a diagram showing another configuration example in the case of the LED light source 14 ′ to which a bidirectional lens is attached. In FIG. 9, the lower end portion 15 a ′ of the reflecting plate 15 extends in the valley portion between the lenses in the bidirectional lens of the LED light source 14 ′ attached to the shade 12. Further, the bent portion of the illumination plate 16 is bent at an obtuse angle. In such a configuration, in addition to the same effects as the configuration of FIG. 8, light is directly irradiated to the bent portion of the illumination plate 16 as in FIG. Can be reduced.

  In the above embodiment, an example in which the lighting device of the present invention is applied to an open showcase has been described. However, the present invention can also be applied to a closed type showcase such as a reach-in or a walk-in whose front is defined by a transparent plate such as glass. . Further, the present invention can also be applied to an open type showcase in which lighting devices and shades are arranged in the vertical direction or arranged on the lower end side of the display room.

  Moreover, it is needless to say that the illumination device of the present invention can be applied to any configuration as long as it is configured to illuminate the two directions of the irradiation target and the shade using the same light source. .

DESCRIPTION OF SYMBOLS 1 Showcase 6 Display room 7 Display shelf 12, 12 'Shade 14, 14' LED light source 14A Board | substrate 14B LED element 14C Cover 15, 15 'Reflection board X Optical axis of LED light source

Claims (9)

An LED light source ;
A translucent shade arranged to obscure the LED light source;
A reflector arranged to face the shade;
A lighting apparatus Ru provided with,
The LED light source is disposed inside the front end portion of the shade, with the optical axis directed to the illumination target opposite to the shade side,
The reflector, the leakage light leaking from the LED light source is reflected toward the front Symbol shade, and, the lighting apparatus characterized in that it is arranged so as to face with the shade across the LED light source.   The lighting device according to claim 1, wherein the leakage light is light emitted outside a 1/2 beam angle of the LED light source. The tip portion of the reflector, the lighting device according to claim 1 or 2 toward the LED light source direction. The lighting device according to claim 3 , wherein a tip portion of the reflecting plate directed in the LED light source direction is extended to a position where a part of irradiation light from the LED light source toward the irradiation target can be reflected. The LED light source is a rod-shaped lighting module that integrates over a plurality of LED elements of a light transmissive cover, claim 3 of the tip portion of the reflector and configured to contact the cover of the lighting module Or the illuminating device of 4 . The lighting device according to claim 5 , wherein a reflection space of reflected light from the reflection plate toward the shade is a sealed space. The reflector, the illumination apparatus according to any one of claims 1 to 6 which is a convex curved shape on the side opposite to the shade side. The reflector, the illumination apparatus according to any one of claims 1-7 having a highly reflective surface reflectance and diffuse reflectance. Lighting device according to any one of claims 1-8 attached to the showcase having a display chamber which bridged the shelves for product display.