JP2020047501A - Lighting fixture - Google Patents

Abstract

To cut a near-ultraviolet ray and a near-infrared ray of light emitted from a light source to suppress color fading and deterioration of an object to be irradiated and prevent an object to be irradiated from being irradiated with greenish light, in a lighting fixture.SOLUTION: A lighting fixture includes: a housing 3 mounted with a light-emitting device 1 inside thereof and including an opening 3d for emitting light that is emitted from the light-emitting device 1 to the outside; a UV and IR cut filter 4 provided so as to block the opening; and a diffusion filter 5 provided on an outside of the cut filter 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lighting fixture, particularly to a lighting fixture equipped with a light emitting element such as an LED. Here, the lighting equipment means any lighting equipment that emits visible light widely. For example, in the case of an LED lighting equipment, an LED lighting equipment provided with a power supply unit that converts an AC from a commercial power supply into a DC for lighting the LED. Not only the LED module including the light emitting section without the power supply section but also the form is not limited to the hard case in which the LED light emitting elements are arrayed and mounted in the hard case, but the LED light emitting elements in the soft case or the tube. , And the arrangement of LED elements is not limited to a linear one, but includes an annular one or a randomly arranged one. Further, the form of the lighting equipment includes various forms such as ceilings, walls, floors, trees, outer walls of buildings, shelves of merchandise display shelves, showcases, and the like. Therefore, for example, a downlight of a recessed ceiling type may be used, and the shape thereof may take various shapes such as a circle, a rectangle, and an ellipse.
Further, the present invention is not necessarily limited to a lighting fixture equipped with an LED light emitting element, and can be applied to a lighting fixture equipped with another type of light emitting element as long as it contributes to solving the problems to be solved by the invention described below. is there.

2. Description of the Related Art In recent years, LED lighting fixtures equipped with an LED module that incorporates a large number of LED elements are widely used. For example, the LED lighting fixtures are mounted on the lower surface of a shelf of a product display shelf or in a showcase to illuminate the product. I have. Alternatively, an interior lighting fixture in which an LED lighting fixture embedded in the floor illuminates the room from the floor surface is also known. Such long LED lighting fixtures are widely known, and there are many patent applications relating to such devices. For example, Patent Document 1.
The light emitted from the LED light-emitting element of the LED lighting equipment used for these various applications is basically visible light (400 to 800 nm), but it contains near-ultraviolet light and near-infrared light, so it is irradiated for a long time. Then, the irradiated object may be discolored or discolored by near-ultraviolet rays, and the irradiated object may be deteriorated by near-infrared rays due to heat or drying by heat. This problem reduces the value of merchandise and exhibits in display shelves and showcases of clothes and ornaments, or in museums and museums, and cannot be overlooked. The same applies to food showcases.

  In order to solve such a problem, it is conceivable to provide a filter that cuts near ultraviolet light and near infrared light. However, according to the study of the present inventors, when those cut filters are used, light emitted from a lighting fixture is used. It turned out that the object had green tint depending on the irradiation angle, and illuminated the object with greenish linear light. In particular, this greenish color is observed near the boundary between the illuminated portion and the non-illuminated portion, which is a shadow of the edge of the case of the lighting fixture, which is not preferable because it is inconvenient in appearance. It is considered that this is because green light lines are generated by color separation by polarized light.

JP 2013-179014 A JP 2017-27916 A

  The present invention solves the above problem, in a lighting device equipped with a light-emitting element, cuts near ultraviolet and near infrared light emitted from the light-emitting element to reduce the color fading of the irradiation object, deterioration and greenish. It is an object of the present invention to provide a lighting device that can prevent light from being irradiated on an object.

The present inventors have arranged a light diffusion plate outside the UV / IR cut filter and diffused the light transmitted through the cut filter in the course of research for achieving the above object. They discovered that light was diffused and became noticeable. In other words, the lighting fixture according to the present invention has a light emitting element mounted therein, and a UV / IR cut filter so as to cover an opening of a housing having an opening for emitting light emitted from the light emitting element to the outside. And a diffusion filter provided outside the cut filter.
In other words, the lighting fixture according to the present invention includes a light-emitting element, a housing having the light-emitting element mounted therein and an opening for emitting light emitted from the light-emitting element to the outside, and closing the opening. And a diffusion filter provided outside this cut filter.

  In the luminaire according to the present invention, the UV / IR cut filter and the diffusion filter may be adjacent to each other or may be provided at an interval.

The UV / IR cut filter is desirably made of resin. Specifically, the UV / IR cut filter may be, for example, a filter obtained by depositing a UV / IR cut film on a transparent acrylic plate.
The UV / IR cut filter can be a filter that cuts light having a wavelength in the near ultraviolet region of 410 nm or less and a near infrared region of 740 nm or more, for example.

  As the light emitting element in the present invention, an LED light emitting element (light emitting diode) is currently mainstream, but is not limited to the LED light emitting element as long as the object of the present invention is achieved. For example, an organic EL (OLED) Needless to say, it is possible to use lighting devices that have been developed in the future and may be widely used as lighting devices.

  The housing provided with an opening for emitting the light emitted from the light emitting element in the present invention to the outside is not limited to a long one, but also includes a cylindrical one such as a downlight, and other UV. -Any shape can be used as long as it can mount an IR cut filter and a diffusion filter.

In the present invention, as the UV / IR cut filter provided to close the opening of the housing, a UV / IR cut film formed by vapor deposition of a UV / IR cut film on a resin plate made of acrylic or the like may be used. Or a mixture of a resin plate and a pigment. In any case, any material having a spectral transmittance capable of cutting off near-ultraviolet rays and near-infrared rays may be used. The wavelengths to be cut may slightly deviate from these wavelengths.
In the case of resin, there is an advantage that processing when assembling into the lighting fixture is easy and breakage of the filter can be prevented.

  In the present invention, the diffusion filter provided outside the UV / IR cut filter may be of any type as long as it has a function of diffusing the traveling direction of light transmitted through the cut filter. What is necessary is just to include an element which diffuses or scatters light on the surface or inside. For example, a material in which fine particles that reflect light are mixed in a transparent resin or glass may be used, or light may be reflected or refracted in multiple directions by providing fine irregularities on the surface of a transparent plate material. Further, the transparent plate material and the unevenness may be integral or separate. In the case of a separate body, a thin film having irregularities on the surface may be attached to a thick support having a smooth surface.

  Further, in the present invention, the UV / IR cut filter and the diffusion filter may be in close contact with each other or may be separated from each other. When they are brought into close contact with each other, it is easy and advantageous in terms of construction to make both of them flat, but it is not limited to flat. When both are provided at an interval, the shapes of the cut filter and the diffusion filter may be different. For example, the cut filter may have a planar shape and the diffusion filter may have a dome shape.

  The claims of Patent Document 2 describe an illuminating device including a filter element containing a dye that absorbs light of a specific wavelength between a light source and a diffusive optical member. Although the present invention is common to the present invention, the object and the effect of the invention are completely different, so that the configuration is also different. That is, the “specific wavelength” to be absorbed in Patent Document 2 does not mean near-ultraviolet rays and near-infrared rays, but is a specific wavelength near the center of the visible light range (585 nm to 595 nm yellow), It is intended to make the color of the filter element difficult to see by absorbing it, and there is no concept or configuration in the present invention for preventing fading and deterioration of the irradiated object by near ultraviolet rays and near infrared rays. Instead, the technical concept is completely different from the present invention. Therefore, Patent Document 2 has no disclosure or suggestion of the present invention, and does not affect the patentability of the present invention.

  The lighting fixture according to the present invention cuts near ultraviolet rays and near infrared rays of light emitted from a light source to suppress discoloration and deterioration of an object to be irradiated and to prevent green light from being irradiated to the object to be irradiated. In addition, there is an effect that generation of green linear light observed by polarized light can be prevented.

Sectional drawing which shows an example of the LED module which is one Embodiment of the lighting fixture by this invention. 4 is a graph showing a spectral energy distribution of an LED used in a lighting device according to the present invention. 4 is a graph showing a spectral transmittance of a UV / IR cut filter used in a lighting fixture according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a lighting device according to an embodiment of the present invention.

  As shown in FIG. 1, this embodiment is directed to an LED module as a lighting fixture, and a long (long in a direction perpendicular to the paper of FIG. 1) substrate 2 provided with an LED light emitting element 1 has a U-shaped cross section. It is fixed to the bottom wall 3c of the housing 3 (casing) of the long type LED module. The upper side of the side walls 3a and 3b of the housing 3 in the figure is opened to form an opening 3d that is long in the longitudinal direction of the housing 3, and near the opening 3d, the opening is long in the lengthwise direction on the inner surfaces of the side walls 3a and 3b. A groove is formed, and a filter assembly in which a UV / IR cut filter 4 and a diffusion filter 5 are stacked is loaded in the groove. At the time of construction, the two filters 4 and 5 are slid and inserted from the end of the groove opened to the end of the housing 3 to be loaded. The diffusion filter 5 is always mounted outside the UV / IR cut filter.

  According to this embodiment, green light generated by color separation by polarized light is not observed. When the diffusion filter 5 is removed from this state, green light is generated. On the other hand, if the UV / IR cut filter 4 is replaced with a mere transparent plate (clear cover) with the diffusion filter 5 attached, green light generated by color separation by polarized light is not observed, but near ultraviolet rays and near infrared rays remain.

  This is because near-ultraviolet light of 410 nm or less out of the light emitted from the LED light emitting element 1 by the cut filter 5, as is clear from the graph of the spectral energy distribution in FIG. 2 and the spectral transmittance of the UV / IR cut filter in FIG. It is considered that near infrared rays of 740 nm or more are cut off, and the light is diffused by the diffusion filter 4, and the green line is diffused to become inconspicuous.

The lighting fixture according to the present invention is not limited to the above-described embodiment, which is as described above, and the contents thereof can be sufficiently realized by those skilled in the art based on the conventional technology and common technical knowledge.
The present invention includes these various modified embodiments, the scope of which will be apparent to those skilled in the art from the description of the above embodiments and modifications described herein.

DESCRIPTION OF SYMBOLS 1 LED light emitting element 2 LED board 3 Housing 3a Side wall 3b Side wall 3c Bottom wall 4 UV / IR cut filter 5 Diffusion filter

Claims (10)

A light emitting element,
A housing provided with the light-emitting element therein and having an opening for emitting light emitted from the light-emitting element to the outside,
A UV / IR cut filter provided to cover the opening,
A lighting fixture comprising: a diffusion filter provided outside the cut filter.   The lighting device according to claim 1, wherein the UV / IR cut filter and the diffusion filter are adjacently stacked.   The lighting apparatus according to claim 1, wherein the UV / IR cut filter and the diffusion filter are provided at an interval.   The lighting device according to any one of claims 1 to 3, wherein the UV / IR cut filter is made of resin.   The lighting device according to claim 4, wherein the UV / IR cut filter is formed by depositing a UV / IR cut film on a transparent acrylic plate.   The lighting device according to claim 1, wherein the UV / IR cut filter is a filter that cuts light having a wavelength in a near ultraviolet region of 410 nm or less and a near infrared region of 740 nm or more.   The lighting device according to any one of claims 1 to 6, wherein the lighting device is an LED module.   The lighting device according to any one of claims 1 to 6, wherein the lighting device is a lighting device including an LED module and a power supply unit.   The lighting device according to any one of claims 1 to 6, wherein the lighting device is a downlight.   The lighting device according to any one of claims 1 to 6, wherein the lighting device is a lighting device including an LED module and a power supply unit.