JP2022154671A - Floor surface lighting fixture - Google Patents

Abstract

To provide a thin bottom surface lighting fixture in which a depth dimension is made to be compact, and which can perform foot lighting and ultraviolet irradiation toward footing.SOLUTION: In a case body mounted below a storage body, a light source unit, a light guide member which is substantially in parallel with a bottom surface, and an LED light source lighting control part are stored. The light source unit includes: a visible light irradiation unit having a visible light LED; and an ultraviolet light irradiation unit on which an ultraviolet LED loading substrate which loads a plurality of ultraviolet LEDs is loaded. The light guide member has, at an end surface, a flat plate shape having an incident surface where emission light from the plurality of ultraviolet light LED light sources enters. Thereby, the ultraviolet light which has entered inside the light guide member emits from the light guide member and radiates the ultraviolet light to the bottom surface. Also, the light radiated from the visible LED radiates the bottom surface. The emission light from the light guide member emits not only from an emission surface on the bottom surface side but also from an end surface, so the bottom surface can be effectively radiated toward the front side of the storage body.SELECTED DRAWING: Figure 2

Description

The present invention relates to a thin lighting fixture that uses an LED that emits ultraviolet light as a light source, and is attached to various installation objects such as stairs, shoe cupboards, entrance stiles, etc. that require foot lighting to illuminate the lower part. The present invention relates to a thin floor lighting fixture suitable for attaching to the lower surface (bottom surface) of a bottom plate (bottom surface) of a shoe box or the like (hereinafter referred to as a "storage unit") to illuminate the lower side of the storage unit.

Conventionally, there is known one in which a fluorescent lamp is attached to the bottom surface of a mirror cabinet of a storage unit (Patent Document 1), and one in which lighting is provided on the bottom surface of a storage cabinet adjacent to the entrance dirt floor of a building (Patent Document 1). 2).

Japanese Patent Application Laid-Open No. 2007-296041 Japanese Patent Laid-Open No. 2001-346640

However, the invention described in Patent Document 1 requires a space for housing the fluorescent lamp in the container. Therefore, if the space below the bottom surface is narrow, it is difficult to install.
In the invention described in Patent Document 2, a lighting fixture is attached to a rear frame of storage furniture which is constructed to be mounted on a wall by floating the storage furniture from the dirt floor or the floor of the entrance. Since it is necessary to attach it to the rear frame when assembling the storage furniture, it cannot be attached later.

Further, the inventions of Patent Documents 1 and 2 do not consider sterilization of footwear, entrance floors, and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and one of its exemplary purposes is to provide a thin floor lighting fixture that can illuminate the feet and irradiate the feet with ultraviolet rays.

One aspect of the present invention provides a floor lighting fixture provided with visible light LEDs and ultraviolet LEDs of the following [1] to [4] in order to achieve the above objects.
[1] A lighting fixture that can be attached to a container to illuminate the space between the container and the bottom surface,
A light source unit comprising a visible light irradiation unit having a visible light LED, and an ultraviolet light irradiation unit having a plurality of ultraviolet LEDs and an elongated light guide member;
an LED light source lighting control unit including a circuit for controlling driving of the visible light LED and the ultraviolet LED;
a case body to which the light source unit and the LED light source lighting control unit are attached;
The case main body is horizontally long, a light guide member is arranged in the case main body,
A light source unit is arranged outside the peripheral end surface of the light guide member,
In the ultraviolet light irradiation unit, an ultraviolet LED mounting board mounted with a plurality of ultraviolet LEDs is arranged along the longitudinal direction of the light guide member,
The light guide member has a flat plate shape, and one end face on the long side is shaped such that ultraviolet light emitted from the plurality of ultraviolet LED light sources is incident from an incident surface provided on the end face,
a surface of the light guide member on the side of the case body is covered with a reflective surface provided on the inner surface of the case body;
The ultraviolet light guided in the light guide member is emitted from the other end surface of the light guide member and the surface of the light guide member opposite to the case main body. A floor lighting fixture characterized by:
[2] The floor lighting fixture according to [1], wherein the ultraviolet light irradiation unit is positioned between the visible light irradiation unit and the light guide member.
[3] The light source unit is provided with a distance measuring sensor,
The floor lighting fixture according to [1] or [2], wherein when the distance between the floor and the distance measuring sensor is greater than a predetermined threshold, the ultraviolet LED is controlled not to light.

Another aspect of the invention is
[4] The floor lighting fixture according to any one of [1] to [3] above is attached to the lower part of the housing such that the surface of the light guide member opposite to the case body is exposed downward. provide a storage unit.

Another aspect of the invention is
[5] A lighting fixture that can illuminate the area below the vertical wall,
a light source unit equipped with an LED mounting board mounted with an LED light source including a plurality of visible light LEDs and a plurality of ultraviolet LEDs;
a flat plate-shaped elongated light guide member having an incident surface on an end surface on which light emitted from the LED light source is incident;
a case body to which the LED light source lighting control section, the light source unit, the light guide member and the LED light source lighting control section are attached;
The case main body is horizontally long, a light guide member is arranged in the case main body,
A light source unit is arranged outside the peripheral end surface of the light guide member,
The LED light source is arranged to face the incident surface so that emitted light enters the light guide member from the incident surface,
a surface of the light guide member on the main body case side is covered with a reflecting surface provided on the inner surface of the main body case;
The incident surface is an end face on the long side of the light guide member, and the LED light sources are arranged in a row along the long side end face,
A floor lighting fixture, comprising: an end face on the long side of the light guide member that is opposite to the incident face; I will provide a.

According to the above-described invention, since the light guide member is used to irradiate the ultraviolet rays downward and forward, the depth dimension is made compact, and the thin type that enables the illumination of the feet and the ultraviolet rays to the feet. A floor lighting fixture can be provided.
In addition, the compact structure enables easy attachment to a storage body or the like even if it is retrofitted.

FIG. 1 is a schematic perspective view for explaining a container to which a bottom lighting fixture is attached. FIG. 2 is a cross-sectional view schematically showing the schematic configuration of the bottom lighting fixture. FIG. 3 is a schematic perspective view of a cross section cut along the front-rear direction for explaining the main part of the bottom lighting fixture. FIG. 4 is a schematic perspective view showing a main part of the ultraviolet light irradiation unit viewed from the second end face side. FIG. 5 is a schematic perspective view illustrating a light guide member used in the ultraviolet light irradiation unit of the first modified example. FIG. 6 is a schematic cross section of a main part for explaining a first modified example. FIG. 7 is a schematic cross-sectional view for explaining another modification.

Although the floor lighting fixture 10 according to the present invention can be used for various purposes, the shoe cupboard 1 installed at the entrance will be described below as an example of the storage body with reference to the drawings.

[First embodiment]
FIG. 1 is a schematic perspective view for explaining a shoe cupboard (storage unit) 1 to which a floor lighting fixture 10 is attached. Here, as shown in FIG. 1, an example will be described in which a thin lighting fixture 10 is attached downward to the bottom surface of a shoe cupboard 1 fixed to a wall surface WS with a distance of several tens of centimeters from the floor surface FS. A shoe cupboard 1 has a storage part 3 provided with a door 2 that can be opened and closed. A plurality of shelves (not shown) for storing shoes 6 are provided inside the storage section 3 . A back surface 3a on the far side of the storage unit 3 is fixed to the wall surface WS of the building by attaching it to the wall surface WS with screws or the like. At this time, the shoe cupboard 1 is fixed to the wall surface 4 so as to be separated upward from the floor surface FS of the entrance. The floor lighting fixture 10 of the present invention is attached downward to the bottom surface of the storage section 3, and as shown in FIG. It is installed at a height (several tens of centimeters) that allows

(floor lighting equipment)
FIG. 2 is a cross-sectional view of a main part schematically showing the general configuration of the floor lighting fixture 10, showing a cross section in a direction orthogonal to the wall surface WS. The floor lighting fixture 10 is fixed to the bottom surface 4 of the storage section 3 from below using screws 28 . In the following description, unless otherwise specified, the descriptions of "top", "bottom", "front", "rear", "left", and "right" are based on the container 1 when the container 1 is installed on the wall surface WS. do. Therefore, "front" corresponds to the direction of the door 2 side of the container, and "rear" corresponds to the direction of the wall surface WS. "Down" corresponds to the direction toward the floor surface FS, and "up" corresponds to the direction opposite to the floor surface FS. Descriptions of "left" and "right" indicate the width direction of the storage unit 3, and "left" refers to the left side of the storage body 1 with the wall surface as the back.

The floor lighting fixture 10 extends in the lateral direction of the shoe cupboard 1 as shown in FIG. It is fixed to the bottom surface 4 by screws 28 . A floor lighting fixture 10 includes a case body 12 to which a light source unit 13 and an LED light source lighting control section 14 are attached. The case main body 12 is horizontally long, and has a length substantially equal to the width of the storage portion 3 in FIG. 1 .

(Case body)
The case body 12 is made of aluminum metal and has a general box shape with an open bottom. FIG. 3 is a schematic perspective view of a cross section cut along the front-rear direction for explaining the main part of the floor lighting fixture 10. The upper side of the paper is the floor FS side of FIGS. The left side is the wall surface WS side. As shown in FIG. 3, the case main body 12 has a plurality of ribs 12a on the inner surface that contacts the bottom surface of the storage portion. The rib 12 a is formed to support the light guide member 21 and increase the strength of the case body 12 . When the inner surface is mirror-finished to form a reflecting surface, the reflecting member 25, which will be described later, may be omitted.

(light source unit)
The light source unit 13 includes a visible light irradiation unit 30 having a visible light LED 31, and an ultraviolet light irradiation unit 20 having a plurality of ultraviolet LEDs 23 and an elongated light guide member 21. The end surface of the light guide member 21 is the front end surface 11 arranged to be part of the In the present embodiment, as shown in FIGS. 2 and 3, the visible light LED 31 is mounted on the rear surface of the ultraviolet LED mounting board 24 of the ultraviolet light irradiation unit 20 so that the visible light LED 31 emits light on the floor surface FS side. placed on the side.

(Ultraviolet light irradiation unit)
The ultraviolet light irradiation unit 20 has a plurality of ultraviolet LEDs 23 and an elongated light guide member 21 . As shown in FIGS. 2 and 3 , the plurality of ultraviolet LEDs 23 are arranged facing one end surface of the light guide member 21 . In this embodiment, a flat plate-shaped light guide member having an end surface thicker than the ultraviolet LED 23 is used. Thereby, a large amount of ultraviolet rays can be taken into the light guide member 21 from the end face.

The light guide member 21 is formed in a plate shape using a material having a property of transmitting ultraviolet rays, particularly ultraviolet rays having a sterilizing effect, which is also called germicidal rays. Synthetic quartz glass is used in this embodiment. Synthetic quartz glass is more expensive than soda glass, but it is suitable as a light guide member because it has excellent ultraviolet transmission characteristics. Soda glass, which is widely used for window glass, has a thickness of, for example, 4 mm and a transmittance of germicidal rays of about 0%. It also exhibits good transmittance for light in the ultraviolet region of .

It is conceivable to use a resin material as another material. However, ABS resin, for example, undergoes a cross-linking reaction of polybutadiene upon exposure to ultraviolet light, and is altered and cured. Molecules in the amorphous region of PP are considered to be easily cut, and grooves are formed by ultraviolet irradiation. PC shows yellowing. Silicone resins, acrylic resins, and silicone-modified epoxy resins exhibit a high transmittance of 80% or more for light in the wavelength range longer than 300 nm, but they transmit light in the UV-B region and UC-C region with shorter wavelengths. The transmittance for ultraviolet light of wavelength is low. Therefore, an appropriate material is selected according to the type of ultraviolet LED used. Ultraviolet rays in the UV-A, UV-B and UV-C regions can be transmitted, at least when crystalline quartz is used. For example, in the case of the UVC series of UV transmissive disposable cells sold by AS ONE Co., Ltd., since it shows transparency to light from the ultraviolet region to the visible region (220 to 800 nm), materials with such characteristics are also available. It can be used as the light guide member 21 .

UV-A refers to ultraviolet rays with a wavelength of 315 to 400 nm, which are classified according to wavelength by the CIE (International Commission on Illumination). UV-B is ultraviolet rays with a wavelength of 280 to 315 nm. UC-C is ultraviolet light with a wavelength of 100-280 nm. In a narrow sense, germicidal radiation means ultraviolet rays with a wavelength of 253.7 nm that have a strong germicidal effect. It has been reported that a deep ultraviolet LED with a wavelength of 275 nm is effective in sterilizing and inactivating E. coli, influenza virus, norovirus, etc., and inactivation by a deep ultraviolet LED with a wavelength of 222 nm has also been reported. In the following description, ultraviolet light in the UV-C region, which is the wavelength range of such reports, is also included in germicidal radiation.

The light guide member 21 is a flat plate-shaped rectangular parallelepiped arranged so that a rectangular surface having a large area is positioned. As shown in FIGS. 2 and 3, one side surface facing the plurality of ultraviolet LEDs 23 among the four side surfaces of the rectangular parallelepiped is the first end surface 21a, and serves as an incident surface on which the light emitted from the ultraviolet LEDs 23 is incident. . The end face opposite to the first end face 21a is the second end face 21b. The second end surface 21b is a side surface from which part of the light emitted from the ultraviolet LED 23 that is incident from the first end surface 21a is emitted, and functions as an emission surface.

The surface of the light guide member 21 on the side facing the floor surface FS, that is, the surface located on the lower side of the paper in FIG. 2 is the first surface 21c. A reflecting member 25 is provided on the upper side of the first surface 21c so as to cover the entire surface of the first surface 21c and the ultraviolet LEDs 23 . The surface opposite to the first surface 21c, that is, the surface located on the case body 12 side is the second surface 21d. 21 d of 2nd surfaces also function as an emission surface from which a part of light radiate|emitted from ultraviolet-ray LED23 which injected from the 1st end surface 21a is radiate|emitted. Further, the first surface 21c is fixed to the case body 12 so as to be exposed.

(ultraviolet light source)
As an ultraviolet light source, a plurality of ultraviolet LEDs 23 mounted on an ultraviolet LED mounting substrate 24 are used. The ultraviolet LED 23 has an LED (light emitting diode) element that emits at least a germicidal ray installed inside a frame made of ceramic or metal, and has an electrode for joining to a solder land or the like formed on a printed circuit board outside. Includes LEDs in surface mount type packages. A plurality of ultraviolet LEDs 23 are mounted on one surface of the ultraviolet LED mounting substrate 24 so as to line up along the first end face 21 a of the light guide member 21 in a row. In order to reduce the size and weight of the ultraviolet light irradiation unit, a plurality of ultraviolet LEDs 23 are arranged in a row, and the size of the first end face 21a, which is the incident surface, is adjusted to the size of the ultraviolet LEDs 23 arranged in a row. It is preferable to use the light guide member 21 having Also, the plurality of ultraviolet LEDs 23 may include LEDs that emit ultraviolet light of different wavelengths. In this embodiment, as the plurality of ultraviolet LEDs 23, a plurality of first UV-LEDs 23a that emit one type of UV-C wavelength are arranged in a row and used.

(Ultraviolet LED mounting board)
The ultraviolet LED mounting substrate 24 uses a metal base substrate in which an aluminum or copper plate and a high thermal conductive resin are bonded together. By using a metal base substrate, it is possible to achieve higher heat dissipation than when using a rigid substrate, and it is possible to improve the heat dissipation of heat generated from the ultraviolet LEDs 23 . The ultraviolet LED mounting substrate 24 is provided with wiring and connectors that connect the plurality of ultraviolet LEDs 23, and the lighting state of the plurality of ultraviolet LEDs 23 is controlled according to a signal from a lighting control unit (not shown) of the ultraviolet LEDs. The ultraviolet LED mounting board 24 is fixed to the reflecting member 25 together with the light guide member 21 . Thereby, the relative position of the ultraviolet LED 23 with respect to the incident surface (first end surface 21a) can be accurately positioned.

(reflective member)
The reflecting member 25 is installed between the light guide member 21 and the case body 12, and is formed by bending an aluminum metal sheet. As shown in FIGS. 2 and 3, a flat plate portion 25a covering the entire surface of the first surface 21c of the light guide member 21 and extending from the edge of the first surface 21c on the side of the first end face 21a and A light shielding portion 25b that is bent inward and positioned on the back surface of the LED mounting substrate 24 is integrally formed. The surface of the flat plate portion 25a on the side of the light guide member 21 is a reflective surface provided with an aluminum layer having a polished surface or a smooth surface with a high reflectance. They are closely arranged so that when emitted from the first surface 21c to the outside, they are reflected back to the first surface 21c. Aluminum exhibits a high reflectance with respect to light with a wavelength in the ultraviolet region and is lightweight, so it is particularly suitable for use in air conditioners for vehicles. The light shielding portion 25 b has an area larger than that of the first end surface 21 a of the light guide member 21 and is positioned on the back surface of the LED mounting board 24 . As shown in FIG. 3, the light shielding portion 25b also functions as a partition that separates the light emitted by the visible LED light source 31 of the visible light emitting unit 30, which will be described later, from the light emitted by the ultraviolet LED 23. FIG.

A mounting portion 27 is provided at the end of the flat plate portion 25a opposite to the light shielding portion 25b. The mounting portion 27 is fixed to the bottom surface 4 of the shoe cupboard 1 using screws 28 . The case body 12 is formed in a general box shape covering the back surface of the reflecting member 25 and the back surface of the printed circuit board 33 of the visible light emitting unit 30 which will be described later. It is fixed in contact with the bottom surface 4 .

(fixed frame)
FIG. 4 is a schematic perspective view showing a main part of the ultraviolet light irradiation unit viewed from the second end face 21b side. The second surface 21 of the light guide member 21 is provided with a fixed frame 29 along the edge of the second surface 21 as shown in FIG. The fixing frame 29 is also made of aluminum metal, which is suitable as a material for holding the light guide member 21 because it is less deteriorated by ultraviolet rays generated from the ultraviolet LEDs 23 and has a high reflectance reflectance. A portion of the fixed frame 29 is also provided on the second end surface 21b side. As shown in FIG. 4, the fixed frame 29 provided on the second end surface 21b has an opening 29a that covers the corners of the light guide member 21 and exposes the central portion of the second end surface 21b. Since the plurality of ultraviolet LEDs 23 are arranged to face the first end surface 21a, it is preferable that the optical axes of the ultraviolet LEDs 23 pass through the first end surface 21a, the second end surface 21b, and the opening 29a. As a result, part of the light emitted from the ultraviolet LED 23 goes straight without being reflected and radiates through the opening 29a.

Next, a case where the ultraviolet LED 23 is lit will be described.

When the ultraviolet LED 23 is an LED that emits light having a germicidal wavelength, the germicidal ultraviolet light can inactivate or sterilize E. coli, influenza virus, norovirus, and the like. Inactivation against coronaviruses by ultraviolet light has also been reported. It is said that the bactericidal effect of ultraviolet light is obtained by inactivating bacteria and viruses by directly damaging RNA. Since the light guide member 21 is made of a material having a high ultraviolet transmittance, the light emitted from the light guide member 21 also has a sterilizing effect.

The ultraviolet LED 23 has its lighting state controlled by an ultraviolet LED lighting controller (not shown), and a drive signal is supplied to the ultraviolet LED 23 via the LED mounting board 24 . When the ultraviolet LED 23 is turned on, ultraviolet light is emitted toward the first end surface (incident surface) 21 a of the light guide member 21 . Part of the ultraviolet light introduced into the light guide member 21 from the first end surface (incidence surface) 21a goes straight through the light guide member 21 toward the second end surface 21b, and another part of the light is guided. The light is repeatedly reflected in the optical member 21 toward the second end face 21b.

Light entering the light guide member 21 from the first end surface (incident surface) 21a and traveling straight toward the second end surface 21b travels straight from the second end surface 21b (output side surface) and emits emitted light UV1. The emitted light UV1 is emitted toward the front side as indicated by the arrow in FIG. That is, the area in front of the door 2 of the shoe cupboard 1 is illuminated. Since this light has traveled straight, the directivity is strong and the spread is small. As a result, substantially no ultraviolet light is emitted upward from the door 2. - 特許庁For example, even for a person who is going to use a shoe cupboard, it is possible to irradiate ultraviolet rays only to the foot area and not to the hands and face of the human body. In addition, the light traveling straight has little reflection or loss at the interface, and has the highest illuminance on the optical axis. Therefore, it is possible to irradiate the air with high intensity ultraviolet light.

Further, part of the light directed toward the second end face 21b while being repeatedly reflected inside the light guide member 21 is reflected by the first surface 21c, proceeds toward the second surface (output surface) 21d, and reaches the second surface ( The inside of the air passage 2 is irradiated from the exit surface 21d. Therefore, the space S below the bottom surface 4 of the shoe cupboard 1 can be illuminated from a wide area toward the floor surface FS. Of the light guided inside the light guide member 21 and reaching the second surface 21d, the light that reaches the second surface 21d at an angle less than the critical angle is internally reflected and is not emitted to the outside. Only light arriving at angles exceeding the critical angle is emitted to the outside. The light UV2 emitted to the outside of the light guide member 21 is the light emitted at an angle slightly exceeding the critical angle, that is, the light emitted obliquely in the direction opposite to the incident surface at an angle of several degrees with respect to the second surface 21d. Emitted light becomes mainstream. Therefore, the emitted light UV2 is emitted obliquely downward toward the front side as indicated by the dashed arrow in FIG. 2, and illuminates the space S mainly. Therefore, the floor surface FS of the entrance and the surfaces of the shoes 6 can be sterilized by ultraviolet rays. As a result, the floor surface FS can be sterilized.

The amount of ultraviolet irradiation required to kill microorganisms such as bacteria varies depending on the wavelength, and UV-B is more effective than UV-A, so a smaller amount of irradiation is sufficient. Furthermore, UV-C is more effective than UV-B. Therefore, by using the ultraviolet LED 23 in the UV-C wavelength range, it can be killed in a shorter time. In this embodiment, since a wide range can be irradiated, even microorganisms and viruses floating in the air within the space S can be killed efficiently. The areas of the second surface 21d and the second end surface 21b, which are output surfaces, may be adjusted according to the ultraviolet irradiation amount and irradiation time of the ultraviolet LED used. In particular, it has been reported that ultraviolet light with a wavelength of 220 nm to 222 nm has a bactericidal action against influenza virus, and the effect on the human body can be reduced more than that of 254 nm germicidal light. As the ultraviolet light emitted from the second end face 21b, it is preferable to use ultraviolet light having a peak wavelength of 220 to 222 nm.

Next, the visible light emitting unit 30 provided on the back side of the LED mounting board 24 shown in FIGS. 2 and 3 will be described.

(visible light emitting unit)
The visible light emitting unit 30 has a function of notifying the lighting state of the ultraviolet LED 23 and a function of irradiating the floor surface FS to provide indirect lighting of the entrance to enhance the design. The visible light emitting unit 30 includes a visible LED light source 31 installed on one surface side of a printed circuit board 33 and a lighting control electronic component 32 installed on the other surface side. As shown in FIG. 3, the printed circuit board 33 is fixed to the back surface of the flat plate portion 25a of the reflecting member, and the visible LED light source 31 is arranged so as to cross the space S and irradiate the floor surface FS with visible light. there is The area on the back side of the LED mounting board 24 where the visible LED light source 31 is installed is optically partitioned by the light shielding portion 25b of the reflecting member on the light guide member 21 side. By adopting such an arrangement, the visible light emitting unit 30 is provided in a portion recessed from the front side of the shoe cupboard 1, that is, on the wall surface WS side, so that the effect of indirect lighting can be enhanced and the lighting quality can be improved. .

The housing frame body 34 is integrally formed by bending the reflecting member 25 . The storage frame 34 and the reflecting member 25 may be formed separately and then assembled into one body. It may be formed integrally with the case main body 12 . The through hole 35 is provided to illuminate the floor surface FS with visible light emitted from the visible LED light source 31 . A plurality of diffusing elements are provided in the through-holes 35 along the light guide member 21 so that the light from the visible LED light source 31 is uniformly irradiated with relatively low intensity on the optical axis. .

The visible LED light source 31 may be an LED that emits a single color, but three types of LED elements, R, G, and B, are provided in one package so as to be able to emit light in a plurality of colors, and can be individually lit. A multi-emission, surface-mount type LED is preferable. By switching between red (R) emission color, green (G) emission color, and blue (B) emission color, or by emitting mixed color light, it is possible to further enhance performance. can.

The visible LED lighting control unit 32 is a circuit component that controls lighting and extinguishing of the visible LED light source 31 . The ultraviolet LEDs 23 of the ultraviolet light irradiation unit 20 are controlled to be turned on and off by an ultraviolet LED lighting controller (not shown). The visible LED lighting control section 32 may be a circuit including an ultraviolet LED lighting control section as a functional block.

Since ultraviolet rays are not visible light, even when the ultraviolet LEDs 23 are turned on, the lighting state cannot be visually confirmed. In this embodiment, when the ultraviolet LED 23 is turned on, the visible LED lighting controller 32 is controlled so that the visible LED light source 31 is turned on at the same time. Specifically, a signal synchronized with the ON/OFF signal output from the ultraviolet LED lighting control unit to the ultraviolet LED 23 is input to the visible LED lighting control unit 32, and the ultraviolet LED 23 is turned ON-OFF and the visible LED light source 31 is turned ON-. OFF is completely synchronized. Thereby, the lighting of the ultraviolet LED 23 can be notified by the lighting of the visible LED light source 31 .

Further, when a sensor element for receiving the ultraviolet rays emitted from the ultraviolet LED 23 is provided, and whether or not the ultraviolet LED 23 is normally turned ON/OFF is determined based on the output signal from the sensor element, and it is determined to be normal. Then, the visible LED lighting control unit 32 turns on the visible LED light source 31 in the normal mode state, and when it is determined that there is an abnormality, the visible LED lighting control unit 32 turns off the visible LED 31 at all times or in the abnormal mode state in response to the failure. Lighting, for example, flashing red may be used to indicate an alarm state in the same manner as the alarm lamp.

Moreover, it is preferable to provide a timer in the ultraviolet light irradiation unit 20 and stop the ultraviolet light emission when the ultraviolet light irradiation is performed for a certain period of time, thereby reducing the temperature rise of the ultraviolet LED 23 due to continuous lighting. If the continuous lighting time of the ultraviolet LEDs 23 is short, it is possible to reduce the effect of erroneously irradiating the human body with ultraviolet rays.

Since the floor lighting fixture 10 of the present embodiment includes the ultraviolet light irradiation unit 20 using the light guide member 21 as described above, the light distribution pattern of the emitted light is determined with respect to the in-plane direction of the light guide member 21. , the light can be collected substantially only in the lower area, and the light directed toward the upper area than the light guide member 21 is suppressed. In addition, since a thin and compact ultraviolet light irradiation unit can be obtained, it can be installed even in a narrow space. In addition, since it is a thin lighting fixture, it can be easily installed even if it is retrofitted.

In addition, the ultraviolet light irradiation unit reduces the attenuation of the ultraviolet light emitted from the ultraviolet LEDs and can irradiate the inside of the air passage from a wide area. It is possible to sterilize by irradiating ultraviolet light over a wide area. Moreover, if it is provided on the shelf inside the storage part of the shoe cupboard, the shoes put in the storage part can be sterilized.

[Modification]
Next, a modified example will be described. In the above embodiment, plate-shaped synthetic quartz glass is used as the light guide member 21 . Synthetic quartz glass exhibits a high transmittance even to ultraviolet rays, but is a hard inorganic material, so it is difficult to mold it into an arbitrary shape using manufacturing equipment such as an injection molding machine, unlike transparent resin materials. Therefore, in the first modified example, the surface of the light guide member 21 is etched to form fine unevenness. FIG. 5 is a schematic perspective view for explaining a light guide member used in a modified ultraviolet light irradiation unit, and FIG. 6 is a cross-sectional view for explaining a main part of the ultraviolet light irradiation unit. In FIGS. 5 and 6, the fine unevenness is shown in exaggerated dimensions.

As shown in FIGS. 5 and 6, a scattering region 26 is formed on the surface of the first surface 21c located on the opposite side of the exit surface. The scattering regions 26 are scattered at a plurality of locations on the boundary between the surface of the first surface 21c facing the reflecting member 25 and the scattering regions 26 . In order to create the scattering region 26, a mask is provided on the surface of the first surface 21c to cover the surface other than the portion where the scattering region 26 is to be provided, and the first surface 21c that is not covered with the mask is etched to create minute irregularities. Create a shape. The etching may be wet etching using a predetermined chemical or dry etching using a predetermined gas. A method of applying a physical force such as sandblasting to form unevenness is not preferable because it tends to damage the synthetic quartz glass. The size of the uneven shape is not limited as long as it is a size that causes scattering reflection.

By providing the scattering region 26 on the first surface 21c located on the opposite side of the emission surface, the direction of the emitted light UV3 emitted from the second surface 21d is changed to an oblique angle mainly toward the upstream side as shown in FIG. The light can be emitted in directions other than the direction of light. That is, it is possible to widen the irradiation area of the ultraviolet rays. In addition, it is preferable to provide the scattering region 26 on the entire surface of the second surface 21c when the light is diffused over the entire surface. This is because the light reflected by the second surface 21c can be reduced.

Next, another modified example will be described.

FIG. 7 is a schematic cross-sectional view for explaining another modification, and corresponds to a cross-section at the same position as the second embodiment for explaining the first embodiment. The same reference numerals are assigned to the same configurations as those of the first embodiment, and descriptions thereof are omitted here. In this modification, one of the plurality of visible LED light sources 31 provided on the printed circuit board 33 of the visible light emitting unit 30 is replaced with an infrared LED light source 36, and the infrared LED light source 36 and the light shielding wall are interposed. The light-receiving elements 37 are arranged side by side. The light-receiving element 37 is a range-finding sensor element that receives infrared light emitted from the infrared LED light source 36 and returns after hitting an obstacle, and sends an electric signal to a circuit component that constitutes a calculation unit (not shown). be.

An infrared LED light source 36 emits infrared light at a predetermined frequency. Infrared light reaches the floor surface FS through the through holes 35 . The light reaching the floor surface FS is reflected by the light receiving element 37 . A signal having an intensity corresponding to the reflected light received by the light receiving element 37 is transmitted to the calculation unit. The calculator calculates the distance to the floor surface FS using both the light emission signal of the infrared LED light source 36 and the light receiving element signal. When the distance between the light source unit 13 and the floor surface FS is smaller than a predetermined threshold distance, for example, 40 cm, it is determined as a normal state in which the light is placed at a height that illuminates the feet, and the ultraviolet LED 23 can be turned on. and If the distance exceeds 40 cm from the floor surface FS, there is a possibility of irradiating not only the feet but also the person's hands and upper body. In this way, ultraviolet light is not emitted when the predetermined threshold value is exceeded, so that the human body can be prevented from being irradiated with the ultraviolet light.

Although the embodiments of the present invention and their modifications have been described above, the above embodiments and modifications are merely examples in all respects. The present invention is not limitedly interpreted by these descriptions. Various other additions, omissions, substitutions and other modifications are possible without departing from the spirit of the present invention. For example, the photocatalyst is laminated so as to cover part of the second surface 21d. The photocatalyst contains a material that undergoes photodecomposition by ultraviolet light, and for example, titanium oxide that has been baked into a flat plate shape can be used. In this way, since the photocatalyst is provided in the place where the ultraviolet light is irradiated, it is possible to deodorize by the photocatalytic action. In other words, it is possible to promote the decomposition of organic matter by photodecomposition, and to enhance the deodorizing effect by photocatalytic action as well as the effect of sterilizing suspended matter in the air by irradiation with ultraviolet light.

In the above-described embodiment, the case where the bottom lighting fixture 10 is attached downward is described as an example, but if it is attached near the ceiling, it should be attached not downward but upward, that is, so that the second surface faces upward. can be installed. In this case, the ceiling surface corresponds to the floor surface. If it is installed at a position near the ceiling surface, for example, in an air conditioner or the like, the straight light emitted from the second end surface 21b travels substantially parallel to the ceiling surface. This is because the amount of ultraviolet rays can be reduced and indirect lighting can be performed. Similarly, when attaching to a wall surface, the second surface may be positioned on the wall surface side, and can be appropriately changed according to the application. In addition, in the above-described embodiment, the visible LED light source 31 is provided on the back side of the ultraviolet LED 31, but it is provided side by side on the ultraviolet LED mounting substrate 24 together with the plurality of ultraviolet LEDs 31, and is emitted through the light guide member 21 similarly to the ultraviolet LED 31. It is good also as a structure to carry out.

The bottom lighting fixture 10 of the present invention can be used for various purposes in addition to being attached to a shoe cupboard. For example, it can be attached to the bottom of a kitchen storage shelf provided in a kitchen or a hanging cupboard with other storage space. It is particularly suitable as a foot light. In addition, since it is thin, it can be easily attached not only to the storage body but also to other furniture and buildings, and the attachment location can be appropriately changed according to various uses.

1 ... Shoe box (storage body)
DESCRIPTION OF SYMBOLS 2... Door 3... Storage part 4... Bottom 6... Shoes 10... Bottom lighting equipment 11... Front end face 12... Case main body 13... Light source unit 14... LED light source lighting control part 20... Ultraviolet light irradiation unit 21... Light guide member 21a ... the first end surface (incidence surface)
21b... Second end face (outgoing side face)
21c... First surface 21d... Second surface (outgoing surface)
23 UV LED
24... Ultraviolet LED mounting board 25... Reflective member 26... Scattering area 27... Mounting part 28... Screw 29... Fixing frame 28... Screw 30... Visible light emitting unit 31... Visible LED light source 32... Visible LED lighting controller 33... Printed circuit board 34... Storage frame body 35... Through hole 36... Infrared LED light source 37... Light receiving element WS... Wall surface FS... Floor surface S... Space UV1, UV2, UV3... Emitted light

Claims (5)

A lighting fixture that can be attached to a storage body to illuminate the space between the storage body and the bottom surface,
A light source unit comprising a visible light irradiation unit having a visible light LED, and an ultraviolet light irradiation unit having a plurality of ultraviolet LEDs and an elongated light guide member;
an LED light source lighting control unit including a circuit for controlling driving of the visible light LED and the ultraviolet LED;
a case body to which the light source unit and the LED light source lighting control unit are attached;
The case main body is horizontally long, a light guide member is arranged in the case main body,
A light source unit is arranged outside the peripheral end surface of the light guide member,
In the ultraviolet light irradiation unit, an ultraviolet LED mounting board mounted with a plurality of ultraviolet LEDs is arranged along the longitudinal direction of the light guide member,
The light guide member has a flat plate shape, and one end face on the long side is shaped such that ultraviolet light emitted from the plurality of ultraviolet LED light sources is incident from an incident surface provided on the end face,
a surface of the light guide member on the side of the case body is covered with a reflective surface provided on the inner surface of the case body;
The ultraviolet light guided in the light guide member is emitted from the other end surface of the light guide member and the surface of the light guide member opposite to the case main body. A floor lighting fixture characterized by: The floor lighting fixture according to claim 1, wherein the ultraviolet light irradiation unit is positioned between the visible light irradiation unit and the light guide member. The light source unit is provided with a distance measuring sensor,
3. The floor lighting fixture according to claim 1, wherein when the distance between the floor and the distance measuring sensor is greater than a predetermined threshold, the ultraviolet LED is controlled not to light. The floor lighting fixture according to any one of claims 1 to 3 is mounted below a storage body so that the surface of the light guide member opposite to the case body is exposed downward. body. A lighting fixture capable of illuminating the lower part of the vertical wall,
a light source unit equipped with an LED mounting board mounted with an LED light source including a plurality of visible light LEDs and a plurality of ultraviolet LEDs;
a flat plate-shaped elongated light guide member having an incident surface on an end surface on which light emitted from the LED light source is incident;
a case body to which the LED light source lighting control section, the light source unit, the light guide member and the LED light source lighting control section are attached;
The case main body is horizontally long, a light guide member is arranged in the case main body,
A light source unit is arranged outside the peripheral end surface of the light guide member,
The LED light source is arranged to face the incident surface so that emitted light enters the light guide member from the incident surface,
a surface of the light guide member on the main body case side is covered with a reflecting surface provided on the inner surface of the main body case;
The incident surface is an end face on the long side of the light guide member, and the LED light sources are arranged in a row along the long side end face,
A floor lighting fixture, wherein the end surface of the light guide member on the side opposite to the incident surface and the surface of the light guide member on the side opposite to the main body case side are output surfaces.

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