JP2019057435A - Lighting fixture - Google Patents

Abstract

To provide a lighting fixture that makes it possible to easily obtain a desired light distribution angle while suppressing glare.SOLUTION: A lighting fixture 1 has an LED 9 and a reflection surface 5 that reflects light of the LED 9, and emits illumination light K1 of light distribution angle γ. The lighting fixture 1 has a light diffusion film 32 that diffuses reflection light K3 off the reflection surface 5. The reflection light K3 has a light distribution angle θ smaller than the light distribution angle γ. The light diffusion film 32 diffuses the reflection light K3 by a diffusion angle δ corresponding to a difference between the light distribution angle γ and the light distribution angle θ.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lighting fixture.

In a lighting fixture having a reflecting mirror, a technique is known in which a diffusion cover for diffusing light is provided at an exit opening of the reflecting mirror, and reflected light from the reflecting mirror is diffused by the diffusion cover (see, for example, Patent Document 1). ). According to this technique, unevenness in illuminance on the irradiated surface is suppressed by diffusion.
In addition, in a lighting fixture having a reflecting mirror, a technique for obtaining illumination light having a desired light distribution angle by controlling reflected light from the reflecting mirror with an optical lens is also known (see, for example, Patent Document 2). .

JP 2017-059498 A International Publication No. 2016/039130

As in Patent Document 2, glare is likely to occur when the light distribution angle of illumination light is controlled by an optical lens.
On the other hand, in the technique of Patent Document 1, a stamped glass (also called a template glass) having a model-like shape drawn on its surface is used for the diffusion cover. Since this diffusion cover diffuses incident light at a random diffusion angle, glare can be suppressed, but it becomes difficult to control the light distribution angle of illumination light.

  An object of this invention is to provide the lighting fixture which can obtain the illumination light of a desired light distribution angle easily, suppressing a glare.

  The present invention includes a light source and a reflective surface that reflects the light of the light source, and in a luminaire that emits illumination light having a first light distribution angle, a sheet-like light diffusion that diffuses the reflected light from the reflective surface A reflected light has a second light distribution angle smaller than the first light distribution angle, and the light diffusing member has a difference between the first light distribution angle and the second light distribution angle. The reflected light is diffused at a corresponding diffusion angle.

  The present invention provides the above-described lighting fixture, comprising: a plate-like plate-like member that is provided at an emission opening of the reflection surface and transmits the reflected light; and the light diffusion member together with the plate-like member includes the reflection surface. It is characterized by being fixed by caulking to the exit opening.

  The present invention is characterized in that, in the lighting fixture, a difference between the first light distribution angle and the second light distribution angle is at least 10 degrees or more.

  The present invention provides the above-described lighting fixture, including a reflecting mirror having the reflecting surface, wherein the reflecting mirror is provided with the light source at a bottom portion of the reflecting surface, and the reflecting mirror has one end portion heated to the light source. And a plurality of heat pipes, the other ends of which extend toward the exit opening.

  The present invention is characterized in that, in the above-mentioned lighting fixture, a groove portion for accommodating the heat pipe is formed in the reflecting mirror, and the heat pipe is joined to the groove portion with a high thermal conductive adhesive. .

  The present invention provides the above-mentioned lighting apparatus, further comprising an outer cover that covers the outer surface of the reflecting mirror in close contact, and the heat pipe is provided on the outer surface of the reflecting mirror and is sandwiched between the reflecting mirror and the outer cover. It is characterized by that.

  According to the present invention, it is possible to easily obtain a desired light distribution angle while suppressing glare.

It is a side view which shows the structure of the lighting fixture which concerns on embodiment of this invention. It is a top view of a lighting fixture. It is a top view of a lighting fixture. It is the figure which looked at the lighting fixture from the IV-IV sectional line of FIG. It is the figure which looked at the lighting fixture from the VV sectional line of FIG. It is an enlarged view of the arrow finger | toe X part of FIG. It is a side view which shows the structure of the lighting fixture which concerns on the modification of this invention. It is the figure which looked at the lighting fixture from the VIII-VIII cross section line of FIG. It is the figure which looked at the lighting fixture from the IX-IX cross section line of FIG. It is a disassembled perspective view of a lighting fixture.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, 2, and 3 are views showing a configuration of a lighting fixture 1 according to the present embodiment. FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a top view. 4 is a view of the luminaire 1 from the IV-IV cross-sectional line of FIG. 1, and FIG. 5 is a view of the luminaire 1 from the VV cross-sectional line of FIG.

The lighting fixture 1 is a fixture mainly used for indoor lighting, and uses an LED 9 (FIG. 5), which is an example of a light-emitting element, as a light source. As shown in FIG. 1, the lighting fixture 1 receives illumination light K1 that spreads at a light distribution angle γ. Irradiation is performed so that the illuminance within the irradiation surface is substantially uniform. In the present embodiment, the ½ illuminance angle is defined as the light distribution angle.
Moreover, the glare 1 is suppressed and the lighting fixture 1 is comprised so that it can install suitably in the position which enters a human visual field. Therefore, the luminaire 1 can be suitably used not only for high ceiling lighting in factories, warehouses, sports facilities, but also for low ceiling lighting in commercial facilities, station concourses, homes, etc., and side lighting from the wall surface.

As shown in FIG. 1, the lighting fixture 1 is provided with the light source part 2, the reflective mirror 4, the front cover unit 6 (FIG. 2), and the arm 8 for fixing to a ceiling surface, a wall surface, etc. .
The light source unit 2 is a part including the light source of the lighting fixture 1, and as shown in FIG. 4, the LED module 10, the holder 12 that holds the LED module 10, and the base unit 14 to which the holder 12 is fixed. I have.

The LED module 10 includes an LED 9 as a light source and a substrate on which the LED 9 is mounted. The LED 9 is a COB type LED having a light emitting surface 9A that is substantially circular in a plan view. As shown in FIG. 5, the holder 12 is a holder that holds the LED module 10 so that it cannot fall off in a state where the light emitting surface 9 </ b> A of the LED 9 is exposed. As shown in FIG. 4, the base portion 14 is a substantially disk-like member, and the holder 12 is fixed to the front surface 14A, and a large number of heat radiation fins 16 are integrally formed on the back surface 14B. In order to efficiently dissipate the heat of the LED 9, the heat dissipating fins 16 and the base portion 14 are integrally formed by casting a material having excellent heat dissipation (for example, an aluminum alloy) and function as a so-called heat sink.
A cylindrical wiring portion 18 is erected on the back surface 14 </ b> B of the base portion 14. The wiring part 18 is connected to the LED module 10 in the light source part 2 through electrical wiring for transmitting the lighting power of the LED 9 and the like. The arm 8 is rotatably provided on the base portion 14.

The reflecting mirror 4 is a bowl-shaped light control member that controls the emitted light of the LED 9, and a reflecting surface 5 is formed on the inner surface as shown in FIG. 4. The reflecting surface 5 has a substantially rotational paraboloid shape centered on the rotation center axis Q, and the light emission center O (FIG. 5) of the light emission surface 9A is disposed at the focal position. Therefore, the radiated light K2 from the light emitting surface 9A is converted into substantially parallel light by the reflection by the reflecting surface 5, and is emitted through the front cover unit 6 of the emission opening 20 (FIG. 4) which is the opening end. Note that the emission center O of the light emitting surface 9A may be arranged at a position other than the focal position of the reflecting surface 5. The light distribution angle θ can also be adjusted by disposing the light emission center O of the light emitting surface 9A along the optical axis direction of the reflecting surface 5 while being shifted from the focal position.
In the present embodiment, the reflected light K3 on the reflecting surface 5 is slightly deviated between the shape of the reflecting surface 5 and the ideal paraboloid and the light emitting surface 9A is not a point light source. It does not become ideal parallel light (that is, light distribution angle θ = 0 degree), and has a slight light distribution angle θ of about 6 degrees.

  As shown in FIG. 4, a flat surface portion 19 is formed on the bottom portion 4 </ b> A of the reflecting mirror 4 so as to come into surface contact with the surface 14 </ b> A of the base portion 14 of the light source unit 2. Inside the reflecting surface 5, the holder 12 is placed in close contact with the flat surface portion 19, and the holder 12 and the base portion 14 are fixed with a fastening member such as a screw with the flat surface portion 19 interposed therebetween. Since the holder 12 is thermally coupled to each of the reflecting mirror 4 and the base portion 14 through the plane portion 19, the heat of the LED 9 is efficiently radiated from the reflecting mirror 4 and the base portion 14 functioning as a heat sink. The Rukoto.

FIG. 6 is an enlarged view of the arrow X portion of FIG.
The front cover unit 6 is a protective member that closes the emission opening 20 and is fixed to the reflecting mirror 4 by caulking. Specifically, as shown in FIG. 6, a cover abutting portion 24 extending in a planar shape in the radial direction of the emission opening 20 is formed at the distal end portion 22 of the reflecting mirror 4. The edge portion 6A of the front cover unit 6 is disposed in contact with the front cover unit 6. Then, the edge portion 24B of the cover abutting portion 24 is crimped so as to wrap around the edge portion 6A of the front cover unit 6, whereby the front cover unit 6 is fixed to the distal end portion 22 of the reflecting mirror 4.

The front cover unit 6 includes a translucent plate 30, a light diffusion film 32, and a packing 34.
The translucent plate 30 is a plate-like member having translucency that transmits the emitted light of the LED 9 and having sufficient hardness for protection from external impacts. In this embodiment, the tempered glass is made of a translucent plate. 30.
The light diffusing film 32 is a resinous sheet-shaped light diffusing member having a diffusing layer that diffuses incident light at a predetermined diffusing angle δ, and the back surface of the translucent plate 30 (the inner surface of the reflecting mirror 4). It is provided so as to cover the entire surface.
The packing 34 is a member attached to the edge of the translucent plate 30 over the entire circumference, and seals the emission opening 20 by being in close contact with the tip 22 of the reflecting mirror 4 by caulking. Further, the packing 34 has a U-shaped cross section and sandwiches both the light transmitting plate 30 and the light diffusion film 32 to prevent the light diffusion film 32 from being peeled off.

  At the time of caulking, the light diffusion film 32 of the front cover unit 6 is simultaneously fixed to the reflecting mirror 4 together with the translucent plate 30, so that the light diffusion film 32 can be easily attached.

The above-mentioned light diffusion film 32 will be further described in detail.
The light diffusion film 32 is a member that does not diffuse (so-called scatter) incident light at a random diffusion angle, but diffuses at a predetermined diffusion angle δ, such as frosted glass or embossed glass. Examples of the diffusing member having such diffusing characteristics include a light diffusing film used for a backlight of a liquid crystal display device, and an optical sheet such as a prism sheet that is attached to the display surface of the liquid crystal display device to prevent peeping of the display surface. Materials.

Further, the light diffusion film 32 has a difference between the diffusion angle δ necessary for obtaining the illumination light K1 having a desired light distribution angle γ, that is, the light distribution angle θ of the reflected light K3 and the light distribution angle γ of the illumination light K1. The one having an angle corresponding to is used.
In the present embodiment, the light distribution angle γ is set to an angle corresponding to a central illumination type, a wide illumination type, or an extra wide illumination type. These medium illuminating, wide illuminating, or special illuminating are stipulated as light distribution characteristics in the high ceiling lighting field in JIL4004-2004 formulated by the Japan Lighting Industry Association. In JIL4004-2004, as the light distribution characteristics in the high ceiling lighting field, in order from the one with the smallest light distribution angle, the special illumination type (1/2 illumination angle is less than 14 degrees) and narrow illumination type (1/2 illumination angle is 14 to 19 degrees), medium illuminating (1/2 illumination angle 19 to 27 degrees), wide illumination (1/2 illumination angle 27 to 37 degrees), and special illumination ( 5) (1/2 illumination angle is 37 degrees or more).

As described above, in the present embodiment, the light distribution angle θ of the reflected light K3 is about 6 degrees (corresponding to the above-mentioned special narrow illumination type). In order to obtain the above, a light diffusion film 32 having a constant diffusion angle δ of 13 degrees or more is used.
In the present embodiment, a diffused film (product model number “D121UP”, “D261S II J1”) manufactured by Tsujiden Co., Ltd. is used as the light diffusing film 32, so that the central illumination type (light distribution angle γ = 21 degrees) is used. Wide light distribution (light distribution angle γ = 29 degrees) is obtained.

As described above, the luminaire 1 according to the present embodiment diffuses the reflected light K3 reflected by the reflecting surface 5 with the light diffusion film 32 having the constant diffusion angle δ, and the illumination light K1 having a predetermined light distribution angle γ. Is emitted.
With this configuration, when designing the luminaire 1 having the light distribution angle γ, the light distribution angle θ of the reflected light K3 is actually measured, and the difference between the measured value of the light distribution angle θ and the light distribution angle γ is necessary. The light diffusion film 32 having the diffusion angle δ is specified in the exit opening 20, and the design of the lighting fixture 1 is facilitated.

In particular, for example, the ease of design is significantly improved as compared with a configuration in which diffusion is performed at a random diffusion angle using, for example, frosted glass or embossed glass.
Specifically, when the diffusion angle of the diffusion member is random, it is difficult to achieve a correlation between the degree of diffusion of the diffusion member and the light distribution angle γ. Therefore, normally, in the design of the luminaire 1, the diffusing member is selected by repeating the operation of changing the degree of diffusion of the diffusing member and measuring the desired light distribution angle γ. On the other hand, according to the lighting fixture 1 of the present embodiment, the diffusion angle δ can be specified only by actually measuring the light distribution angle θ of the reflected light K3, and an appropriate light diffusion film 32 can be selected. It will be easier.
Further, in a configuration in which diffusion is performed at a random diffusion angle using frosted glass, embossed glass, or the like, the scattering component increases as the degree of diffusion increases. For this reason, when the difference between the light distribution angle θ of the reflecting mirror 4 and the light distribution angle γ of the luminaire 1 is increased to 10 degrees or more, the illuminance decreases due to scattering, and the illumination efficiency decreases. On the other hand, according to the lighting fixture 1 of this embodiment, even if the difference of the light distribution angle (theta) of the reflective mirror 4 and the light distribution angle (gamma) of the lighting fixture 1 is 10 degree | times or more, illumination intensity fall is compared. Therefore, a decrease in lighting efficiency can be suppressed.

  Furthermore, in the luminaire 1 of the present embodiment, since the illumination light K1 is light whose diffusion is controlled by the light diffusing film 32, glare compared to a configuration in which the light distribution angle γ of the illumination light K1 is controlled by an optical element such as a lens. Can be suppressed sufficiently. Therefore, the luminaire 1 can be suitably installed on a low ceiling or wall surface that is high enough to enter the human field of view, and illumination with reduced illuminance unevenness on the irradiated surface can be achieved.

Moreover, in the lighting fixture 1 of this embodiment, the light-diffusion film 32 is being fixed to the front-end | tip part 22 of the output opening 20 of the reflective surface 5 by the crimping process with the translucent board 30 of the front cover unit 6. FIG.
Thereby, the light diffusion film 32 can also be attached simultaneously with the attachment of the light transmitting plate 30 to the emission opening 20, and workability is improved.

In the luminaire 1 of the present embodiment, the difference between the light distribution angle γ of the illumination light K1 and the light distribution angle θ of the reflected light K3 is at least 10 degrees or more.
Thereby, compared with the structure diffused with a random diffusion angle by frosted glass etc., the fall of illumination efficiency can also be suppressed, making the design of the lighting fixture 1 easy.

  The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

(Modification 1)
In the embodiment described above, a heat dissipation structure that dissipates the heat of the LED 9 may be provided in the reflecting mirror 4 to improve heat dissipation.

  FIG. 7 is a side view showing the configuration of the lighting fixture 100 according to this modification. FIG. 8 is a view of the luminaire 100 as seen from the section line VIII-VIII in FIG. FIG. 9 is a view of the luminaire 100 from the IX-IX cross-sectional line of FIG. FIG. 10 is an exploded perspective view of the lighting apparatus 100. In these drawings, the same members as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The luminaire 100 includes a reflector unit 150 that controls light from the light source unit 2. The reflecting mirror unit 150 has the same optical function as the reflecting mirror 4 of the lighting fixture 1 described above. As shown in FIG. 10, the reflecting mirror 104, a plurality of heat pipes 154, an outer cover 156, and the like. It is equipped with.
The reflecting mirror 104 corresponds to the reflecting mirror 4 provided in the lighting fixture 1. The outer cover 156 is a cover member formed of a material having high thermal conductivity that is in close contact with substantially the entire outer surface of the reflecting mirror 104 and covers the entire reflecting mirror 104.

The heat pipe 154 is a rod-shaped heat transport means, and is provided radially on the outer surface of the reflecting mirror 104 from the bottom 104 </ b> A toward the emission opening 20. The reflecting mirror 104 is covered with the outer cover 156, so that the reflecting mirror 104 104 and the outer cover 156.
More specifically, a plurality of groove portions 160 extending radially from the bottom portion 104A to the emission opening 120 are formed on the outer surface of the reflecting mirror 104, and the inner surface of the outer cover 156 also extends from the bottom portion 156A to the opening end portion 156B. A plurality of radially extending groove portions 162 are formed at positions corresponding to the groove portions 160 of the reflecting mirror 104. Then, as shown in FIG. 9, tubular portions 166 extending radially from the bottom portion 104 </ b> A are formed by the pair of groove portions 160 and 162, and the heat pipes 154 are housed in the respective tubular portions 166.
The heat pipe 154 is joined to the tubular portion 166 without a gap by a heat conductive adhesive so that heat can be efficiently transferred from the heat pipe 154 to the reflecting mirror 104 and the outer cover 156.

As shown in FIG. 8, similarly to the reflecting mirror 4, the reflecting mirror 104 has a flat portion 19 formed on the bottom portion 104 </ b> A, and the holder 12 holding the LED 9 is placed on the flat portion 19. . One end 154 </ b> A of each heat pipe 154 is connected to the holder 12, and each end 154 </ b> A is thermally coupled to the LED 9.
Thereby, the heat of the LED 9 is transmitted to the one end 154A of the heat pipe 154 through the holder 12, and is transmitted to the other end 154B on the emission opening 20 side by the heat transport function of the heat pipe 154. At this time, heat is transmitted to each of the reflecting mirror 104 and the outer cover 156 through the heat pipe 154, and the heat is efficiently radiated from the reflecting mirror 104 and the entire outer cover 156.

  Further, as shown in FIG. 8, the holder 12 is fixed to the base portion 14 that functions as a heat sink with the reflector 104 and the outer cover 156 interposed therebetween, and is similar to the lighting fixture 1 of the above-described embodiment. Further, the base portion 14 and the holder 12 are thermally connected. Thereby, the heat dissipation performance of the lighting fixture 100 is further improved.

  According to this modification, the following effects can be obtained.

  In the lighting fixture 100 of the present modification, one end portion 154A is thermally coupled to the LED 9 that is a light source, and a plurality of heat pipes 154 are provided with the other end portion 154B extending to the exit opening 20 side. Therefore, the heat of the LED 9 can be transmitted to the entire reflecting mirror 104 through the heat pipe 154 and efficiently radiated.

In the lighting fixture 100 of this modification, the reflecting mirror 104 is formed with a groove portion 160 for accommodating the heat pipe 154, and the heat pipe 154 is joined to the groove portion 160 with a high thermal conductive adhesive.
Thereby, the heat conduction efficiency from the heat pipe 154 to the reflecting mirror 104 increases, and the heat dissipation performance can be improved.

  In the lighting fixture 100 of this modification, the heat pipe 154 is provided on the outer surface of the reflecting mirror 104 and is sandwiched between the reflecting mirror 104 and the outer cover 156, so that the heat pipe 154 can be prevented from falling off.

In this modification, the heat pipe 154 may be provided on the reflecting surface 5 of the reflecting mirror 104. In this case, instead of the outer cover 156, an inner cover (not shown) provided inside the reflecting mirror 104 and having a reflecting surface on the inner surface may be provided.
Further, by making the cross section of the heat pipe 154 elliptical, the contact area between the heat pipe 154 and the reflecting mirror 104 may be increased, and the thermal conductivity to the reflecting mirror 104 may be increased.

(Other variations)
In the light diffusion film 32, the diffusion angle δ may be different depending on the azimuth angle as in the so-called anisotropic diffusion film.
The present invention can be applied not only to a lighting fixture for indoor lighting but also to a lighting fixture for outdoor lighting.

DESCRIPTION OF SYMBOLS 1,100 Lighting fixture 2 Light source part 4,104 Reflective mirror 4A, 104A Bottom part 5 Reflecting surface 6 Front cover unit 9 LED (light source)
12 Holder 14 Base part 16 Radiation fin 20, 120 Output opening 30 Translucent plate (plate-like member)
32 Light diffusion film (light diffusion member)
34 Packing 150 Reflector unit 154 Heat pipe 154A One end 154B Other end 156 Outer cover 160, 162 Groove 166 Tubular portion K1 Illumination light K3 Reflected light γ Light distribution angle (first light distribution angle)
δ Diffusion angle θ Light distribution angle (second light distribution angle)

Claims (6)

In a lighting fixture that includes a light source and a reflecting surface that reflects light from the light source, and emits illumination light having a first light distribution angle,
A sheet-like light diffusing member for diffusing the light reflected by the reflecting surface;
The reflected light has a second light distribution angle smaller than the first light distribution angle;
The light diffusion member diffuses the reflected light at a diffusion angle corresponding to a difference between the first light distribution angle and the second light distribution angle;
A lighting apparatus characterized by that. A plate-like plate-like member that is provided at the exit opening of the reflecting surface and transmits the reflected light;
With
The light diffusing member is fixed together with the plate-like member to the exit opening of the reflecting surface by caulking,
The lighting fixture according to claim 1. The difference between the first light distribution angle and the second light distribution angle is at least 10 degrees,
The lighting fixture according to claim 1 or 2, wherein A reflecting mirror having the reflecting surface;
The reflecting mirror is provided with the light source at the bottom of the reflecting surface,
The reflecting mirror is provided with a plurality of heat pipes, one end of which is thermally coupled to the light source and the other end of which extends toward the exit opening.
The lighting fixture according to any one of claims 1 to 3. The reflecting mirror is formed with a groove for accommodating the heat pipe,
The heat pipe is joined to the groove with a high thermal conductive adhesive,
The lighting fixture according to claim 4. An outer cover that covers and closely contacts the outer surface of the reflecting mirror;
The heat pipe is provided on the outer surface of the reflecting mirror, and is sandwiched between the reflecting mirror and the outer cover.
The lighting fixture according to claim 4 or 5, characterized by the above.

Images