JP5595065B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture applied to a downlight embedded in, for example, a ceiling construction surface using an LED as a light source.

  As an example of a conventional lighting fixture, there is one in which a translucent plate having a lens is arranged on the optical axis of an LED (see, for example, Patent Document 1).

JP2009-245910A (FIG. 1, paragraph number 0013)

In general, an LED has a high light directivity, a high luminance, and a low solid angle light source due to its structure, and thus emits strong and thin light. Therefore, so-called glare, which is defined as glare that causes discomfort and difficulty in seeing objects, is likely to occur.
In a luminaire using a reflector, glare occurs because the light reflected by the reflector is viewed directly depending on the angle at which a person looks into.
In the conventional lighting apparatus disclosed in Patent Document 1, the distance to the irradiation target and the size of the illumination spot are arbitrarily set by bringing the LED close to the top of the lens.

However, in the conventional lighting device disclosed in Patent Document 1, light from the LED is directly emitted to the outside through the light transmitting plate.
Therefore, the conventional lighting device disclosed in Patent Document 1 cannot reduce glare.

By the way, in order to reduce glare, when the reflection surface of the reflection plate is a diffuse reflection surface, a baffle for light shielding is provided, or a reflection plate and a cone are provided so as to secure a distance from the LED. There is a lighting fixture.
However, in such a conventional lighting fixture, the height dimension of the fixture main body becomes large.
Therefore, such a conventional lighting apparatus is not preferable because the appearance is enlarged.

On the other hand, there is a luminaire in which reflected light is controlled downward using a specular reflector in order to reduce glare.
However, with such a conventional lighting fixture, it is difficult to control diffuse light distribution.
Therefore, in such a conventional lighting fixture, the structure of the specular reflector becomes complicated, which may be disadvantageous in terms of manufacturing cost.
In addition, there is a luminaire that uses a diffuser to reduce glare.
However, in such a conventional lighting fixture, when installed on the ceiling or the like, glare may occur depending on the relationship between the diffusivity and transmittance of the diffusion plate.
Therefore, it is difficult to reliably reduce glare in such a conventional lighting fixture.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a luminaire that can reliably reduce glare in terms of cost without increasing the size.

Lighting device according to the present invention, the LED light source, a reflector for reflecting light from the LED light source, a transparent panel illuminated Ru are arranged in the direction side of the LED light source so as to cover the reflection plate, the reflection plate A transparent cylindrical member disposed on the outer periphery of the transparent panel and projecting downward from the lower surface of the transparent panel , and when the LED light source emits light, the light reflected by the reflector and incident on the transparent panel is The light that is refracted at the upper surface of the transparent panel and then travels through the transparent panel, is refracted at the lower surface of the transparent panel, is emitted obliquely downward, and is emitted obliquely downward from the lower surface of the transparent panel. progresses the cylinder member from being refracted at the inner peripheral surface of the member, refracted at the outer peripheral surface of the cylindrical member, and is emitted is converted to not cause glare extending laterally light

  Moreover, as for the lighting fixture which concerns on this invention, a cylinder member has a groove | channel.

  Furthermore, as for the lighting fixture which concerns on this invention, a cylinder member has a step part in an inner surface.

  According to the lighting fixture of the present invention, there is an effect that glare can be surely reduced advantageously in terms of cost without becoming large.

The partially broken side view of the lighting fixture of 1st Embodiment which concerns on this invention Bottom view of the lighting fixture of FIG. Conceptual diagram of edge lighting in the lighting apparatus of FIG. Optical characteristic table of resin material applied to cylindrical member of lighting apparatus of FIG. Optical characteristic table of resin material applied to cylindrical member of lighting apparatus of FIG. 1 is a vertical sectional view around a cylindrical member for explaining optical characteristics of the lighting apparatus of FIG. Vertical sectional view around the cylindrical member of the lighting fixture of the second embodiment according to the present invention Vertical sectional view around the cylindrical member of the lighting fixture of the third embodiment according to the present invention Vertical sectional view around the cylindrical member of the lighting fixture of the fourth embodiment according to the present invention Vertical sectional view of a comparative example

Hereinafter, the lighting fixture which concerns on several embodiment of this invention is demonstrated with reference to drawings.
(First embodiment)
The lighting fixture 10 which is 1st Embodiment of this invention is the LED main body 11 with the fixture main body 11, the frame member 12, the some LED chip (LED light source) 14, and the LED unit 13, and several reflection. This is a downlight that is provided in a mounting hole 2 provided in the ceiling construction surface 1 with a reflecting plate member 16 having a plate 17, a transparent panel 18, and a cylindrical member 19 integrally formed with the transparent panel 18.

  As shown in FIGS. 1 and 2, the instrument body 11 is formed in a bottomed cylindrical shape having a peripheral plate 20 and a bottom plate 21 using, for example, a hard resin material having an insulating property or a metal material such as die casting. ing. In the instrument body 11, a power supply unit 22 is incorporated on the bottom plate 21 inside the peripheral plate 20, and a metal top plate 23 is attached to the top of the peripheral plate 20.

  A power terminal block 24 is attached to the top plate 23. The power terminal block 24 is connected to an external commercial power control circuit. A tool wire (not shown) is electrically connected from the power terminal block 24 to the power unit 22, and a tool wire (not shown) is connected from the power unit 22 to the LED unit 13.

  The frame member 12 is formed in a cylindrical shape using the same material as that of the instrument body 11, and is screwed to the outside of the bottom portion of the instrument body 11 with a screw 25. The frame member 12 has a flange 26 in contact with the lower surface of the ceiling construction surface 1 at the outer edge of the lower end portion, and a plurality of attachment springs (not shown) are attached to the outer peripheral portion. The LED unit 13 is assembled with a heat radiation sheet 27 interposed between the lower surface of the bottom plate 21 of the instrument body 11 and the circuit board 15.

  The reflector member 16 is formed in a disc shape, and has a plurality of concave spherical reflectors 17 at positions corresponding to the LED chips 14 of the LED unit 13. The inner surface of the reflecting plate 17 is a metal vapor deposition surface by aluminum sputtering, for example. An insulator 28 is interposed between the circuit board 15 and the reflection plate member 16 so that the LED chip 14 is exposed in the reflection plate 17.

  The transparent panel 18 has a predetermined thickness and is formed in a circular plate shape having an outer diameter that covers the reflection plate 17 of the reflection plate member 16. The cylindrical member 19 is formed in a cylindrical shape having an inner diameter dimension slightly larger than the inner diameter dimension of the reflecting plate 17 at a position corresponding to the circumference of the reflecting plate 17 and the same number as the number of the reflecting plates 17. Connected to the bottom surface.

  The cylindrical member 19 is attached to the frame member 12 so as to protrude from the cylindrical member hole 30 provided in the base plate 29 assembled to the frame member 12 to the inner peripheral portion of the frame member 12. The transparent panel 18 may be formed in a single disk shape similar to the reflector member 16, and in this case, the cylindrical member 19 is formed so as to protrude downward from a predetermined position on the lower surface of the transparent panel 18. Is done. The transparent panel 18 and the cylindrical member 19 are an acrylic resin (Acrylic Resin), which is a polymer of acrylic ester or methacrylic ester, and is a highly transparent non-crystalline synthetic resin, or a polycarbonate, which is a heat flexible plastic. It is integrally molded using resin (Polycarbonate).

  Next, edge lighting of the lighting fixture 10 will be described. As shown in FIG. 3, when the light incident on the resin material is emitted into the air, the relationship between the incident angle (r), the reflection angle (i), and the refractive index (n) is

It is obtained by.
Based on this, the lighting fixture 10 can perform edge lighting by shining the engraved character or pattern by emitting light from the edge or emitting light to the opposite edge.

Next, the optical characteristics of the cylindrical member 19 will be described. As shown in FIG. 4, when the refractive index (n) of the acrylic resin is n≈1.49 and the refractive index (n) of the polycarbonate resin is n≈1.59, the reflection angle (i) and the incident angle ( As a result of examining the relationship with r), the critical angle at which total reflection starts is 42.10 degrees for the acrylic resin and 38.97 degrees for the polycarbonate resin. That is, when light is reflected from the resin side into the air, the reflection angle (i) increases corresponding to the incident angle (r). That is, the reflection angle (i) with respect to the incident angle (r) indicates that the polycarbonate resin has a larger reflection angle (i) than the acrylic resin.
As shown in FIG. 5, when light enters the acrylic resin from the air, the reflection angle (i) increases corresponding to the incident angle (r). The cylindrical member 19 is created by applying such optical characteristics of acrylic resin and polycarbonate resin.

  Next, optical characteristics of the lighting fixture 10 will be described. As shown in FIG. 6, when commercial power is supplied from the external control circuit to the power supply unit 22 through the power supply terminal block 24, the commercial power supply is converted into DC power by the power supply unit 22, and the converted DC current is converted into the LED unit 13. The circuit board 15 is provided with a printed circuit. Then, the LED chip 14 emits light by the direct current, and the light α1 reflected by the reflecting plate 17 out of the light from the LED chip 14 is incident on the upper surface of the transparent panel 18. The light α1 incident on the transparent panel 18 is refracted on the upper surface of the transparent panel 18 and then guided through the transparent panel 18. The light α1 guided in the transparent panel 18 is refracted on the lower surface of the transparent panel 18 and then emitted and proceeds in the lateral direction.

The light α1 traveling in the lateral direction from the lower surface of the transparent panel 18 is refracted on the inner peripheral surface of the cylindrical member 19 and then enters the cylindrical member 19. The light α 1 incident from the inner peripheral surface of the cylindrical member 19 is guided through the cylindrical member 19, is refracted at the outer peripheral surface of the cylindrical member 19, and is emitted toward the lateral direction of the cylindrical member 19.
That is, the light α1 reflected by the reflecting plate 17 is refracted twice in the transparent panel 18 and then refracted twice in the cylindrical member 19 to be converted into light α1 directed in the lateral direction. This creates light that does not cause glare.

Therefore, in the lighting fixture 10 of the first embodiment, the tube member 19 converts the light α1 from the LED chip 14 into the light α1 directed in the lateral direction.
Thereby, in the lighting fixture 10 of this 1st Embodiment, since the cylinder member 19 is only connected to the transparent panel 18, a glare can be reduced reliably advantageously at a cost viewpoint.

Moreover, in the lighting fixture 10 of this 1st Embodiment, it is not necessary to provide the baffle and cone for reducing glare.
Thereby, in the lighting fixture 10 of this 1st Embodiment, the height dimension of the fixture main body 11 becomes large, and does not enlarge.

In addition, in the lighting fixture 10 of this 1st Embodiment, control which directs reflected light below using a specular reflector is not performed.
Thereby, in the lighting fixture 10 of this 1st Embodiment, it is not necessary to perform the diffuse light distribution which is difficult to control.

Furthermore, in the lighting fixture 10 of this 1st Embodiment, the diffusion plate is not used.
Thereby, since it does not relate to the relationship between the diffusivity and transmittance of the diffusion plate, it can be easily manufactured without including complicated factors.

And in the lighting fixture 10 of this 1st Embodiment, even if the reflector 17 is a diffuse reflector, the light (alpha) 1 from the LED chip 14 is converted into the light (alpha) 1 which turned to the horizontal direction by the cylinder member 19. FIG.
Thereby, in the lighting fixture 10 of this 1st Embodiment, a glare can be reduced reliably.

Moreover, in the lighting fixture 10 of this 1st Embodiment, since the cylindrical member 19 is arrange | positioned around the reflector 17, the cylindrical member 19 itself shines brightly.
Thereby, in the lighting fixture 10 of this 1st Embodiment, the fall of light does not arise in the place which wants illumination intensity widely as light.

(Second Embodiment)
Next, the lighting fixture of 2nd Embodiment of this invention is demonstrated. In the following embodiments, components that are the same as those in the first embodiment described above or functionally similar components are simplified or omitted by giving the same reference numerals or equivalent symbols in the drawings. To do.

  As shown in FIG. 7, the lighting fixture 40 of 2nd Embodiment of this invention is V-shaped from the upper surface of the transparent panel 42 with which the cylinder member 41 was integrally molded to the center part of the thickness direction of the cylinder member 41. As shown in FIG. A groove 43 is formed. The groove 43 is formed in an annular shape and forms a space 44 in the thickness direction of the cylindrical member 41, that is, in the lateral direction.

  In the lighting fixture 40, the light α <b> 1 from the LED chip 14 reflected by the reflecting plate 17 is refracted on the upper surface of the transparent panel 42 and then guided through the transparent panel 42. The light α1 guided in the transparent panel 42 is refracted on the lower surface of the transparent panel 42 and then emitted and travels in the lateral direction. The light α1 traveling in the lateral direction from the lower surface of the transparent panel 42 is refracted on the inner peripheral surface of the cylindrical member 41 and then enters the cylindrical member 41.

The light α1 refracted on the outer peripheral surface of the groove 43 inside the cylindrical member 41 and refracted on the outer peripheral surface of the groove 43 travels in the lateral direction in the space portion 44 in the groove 43. The light α <b> 1 traveling in the lateral direction in the space 44 in the groove 43 is refracted on the inner peripheral surface of the groove 43 and then enters the cylindrical member 41.
The light α1 refracted on the outer peripheral surface of the cylindrical member 41 travels in the lateral direction from the outer peripheral surface of the cylindrical member 41. That is, the light α1 reflected by the reflecting plate 17 is refracted twice in the transparent panel 42 and then refracted four times in the cylindrical member 41, thereby being converted into light α1 directed in the lateral direction. This creates light that does not cause glare.

Accordingly, in the lighting fixture 40 of the second embodiment, the light α1 from the LED chip 14 is repeatedly refracted a plurality of times by the groove 43 of the cylindrical member 41 and converted into the light α1 directed in the lateral direction.
Thereby, in the lighting fixture 40 of this 2nd Embodiment, a glare can be reduced reliably reliably at a cost viewpoint.

(Third embodiment)
Next, the lighting fixture of 3rd Embodiment of this invention is demonstrated.
As shown in FIG. 8, the lighting device 50 according to the third embodiment of the present invention has a plurality of step portions 52 formed on the inner peripheral surface of a cylindrical member 51. The inner diameter dimension of the stepped portion 52 decreases as the distance from the transparent panel 53 approaches.

  In the lighting fixture 50, the light α1 from the LED chip 14 reflected by the reflecting plate 17 is refracted on the upper surface of the transparent panel 53 and then guided through the transparent panel 53. The light α1 guided through the transparent panel 53 is The light is refracted on the lower surface of the transparent panel 53 and then travels in the lateral direction. The light α1 traveling in the lateral direction from the lower surface of the transparent panel 53 is refracted by the plurality of step portions 52 on the inner peripheral surface of the cylindrical member 51 and then enters the cylindrical member 51. The light α1 incident from the plurality of step portions 52 on the inner peripheral surface of the cylindrical member 51 is refracted on the outer peripheral surface of the cylindrical member 51 after being guided through the cylindrical member 51 and emitted toward the lateral direction of the cylindrical member 51. . In other words, the light α1 reflected by the reflecting plate 17 is refracted twice in the transparent panel 53 and then refracted a plurality of times including the stepped portion 52 in the cylindrical member 51 to be converted into light α1 directed in the lateral direction. Will be. This creates light that does not cause glare.

Therefore, in the lighting fixture 50 of the third embodiment, the light α1 from the LED chip 14 is repeatedly refracted a plurality of times by the step portion 52 of the cylindrical member 51 and converted into the light α1 directed in the lateral direction.
Thereby, in the lighting fixture 50 of this 3rd Embodiment, a glare can be reduced reliably reliably at a cost viewpoint.

(Fourth embodiment)
Next, the lighting fixture of 4th Embodiment of this invention is demonstrated.
As shown in FIG. 9, in the luminaire 60 according to the fourth embodiment of the present invention, a cylindrical member 61 that is inclined outward by a predetermined angle θ with respect to the vertical direction is connected to a transparent panel 62. . The inclination angle of the cylindrical member 61 is set according to the refractive characteristics of the cylindrical member 61.
In the luminaire 60, the light α1 from the LED chip 14 reflected by the reflecting plate 17 is refracted on the upper surface of the transparent panel 62 and then guided through the transparent panel 62. The light α1 guided through the transparent panel 62 is The light is refracted on the lower surface of the transparent panel 62 and then travels in the lateral direction. The light α1 traveling in the lateral direction from the lower surface of the transparent panel 62 is refracted on the inner peripheral surface of the cylindrical member 61 and then enters the cylindrical member 61. The light α1 incident from the inner peripheral surface of the cylindrical member 61 is guided through the cylindrical member 61, is refracted on the outer peripheral surface of the cylindrical member 61, and is emitted toward the lateral direction of the cylindrical member 61. That is, the light α1 reflected by the reflecting plate 17 is refracted twice in the transparent panel 62 and then refracted twice by the cylindrical member 61, thereby being converted into light α1 directed in the lateral direction. This creates light that does not cause glare.

Accordingly, in the lighting fixture 60 of the fourth embodiment, the light α1 from the LED chip 14 is repeatedly refracted a plurality of times and converted into the light α1 directed in the lateral direction due to the inclination of the tubular member 61.
Thereby, in the lighting fixture 60 of this 4th Embodiment, a glare can be reduced reliably advantageously at a cost viewpoint.

(Comparative example)
Next, in order to confirm the effect of the lighting fixtures 10, 40, 50, 60 according to the present invention, a lighting fixture 100 as a comparative example was created and compared. As shown in FIG. 10, the lighting fixture 100 includes a circuit board 103 on which the LED chip 102 is mounted in the LED unit 101, and a transparent panel 105 is assembled below the reflector 104.

  In the lighting apparatus 100 of the comparative example, the light α2 from the LED chip 102 reflected by the reflecting plate 104 is refracted on the upper surface of the transparent panel 105 and then guided through the transparent panel 105 and guided through the transparent panel 105. The light α2 is refracted on the lower surface of the transparent panel 105 and then emitted downward, and is emitted obliquely downward from the transparent panel 105 at a large elevation angle. Therefore, it can be seen that glare occurs because a person directly looks at the light α2 emitted obliquely downward with a large elevation angle.

  In addition, the instrument main body, the frame member, the LED unit, and the like used in the above embodiments are not limited to those illustrated, and can be appropriately changed.

10, 40, 50, 60 Lighting equipment 14 LED chip (LED light source)
17 Reflector 18, 42, 53, 62 Transparent panel 19, 41, 51, 61 Tube member 43 Groove 52 Step

Claims (3)

An LED light source;
A reflector for reflecting light from the LED light source;
A transparent panel illuminated Ru are arranged in the direction side of the LED light source so as to cover the reflective plate,
A transparent cylindrical member disposed on the outer peripheral edge of the reflecting plate and projecting downward from the lower surface of the transparent panel;
Equipped with a,
When the LED light source emits light, the light reflected by the reflector and incident on the transparent panel is refracted on the upper surface of the transparent panel and then travels through the transparent panel and is refracted on the lower surface of the transparent panel. Is emitted obliquely downward,
Light emitted obliquely downward from the lower surface of the transparent panel is refracted on the inner peripheral surface of the cylindrical member, travels through the cylindrical member, is refracted on the outer peripheral surface of the cylindrical member, and spreads in the lateral direction. A luminaire that is converted into light that does not cause glare and is emitted .   The lighting fixture according to claim 1, wherein the cylindrical member has a groove.   The lighting fixture according to claim 1, wherein the cylindrical member has a stepped portion on an inner surface.

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