JP6304538B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting apparatus installed on a ceiling or a wall.

  In recent years, lighting fixtures using LEDs (light emitting diodes) as light sources have been rapidly spreading due to the advantages of low power consumption and long life. However, the LED light source has higher light directivity than conventional light sources (fluorescent lamps and incandescent lamps). Therefore, there is a problem that glare is likely to occur, and the brightness of the lighting space because it irradiates only directly under the fixture body (when installed on the ceiling) or front (when installed on the wall) and not on the ceiling or wall. There is a problem that it is difficult to obtain a feeling.

  As a solution to such a problem, a lighting apparatus described in Patent Document 1 has been proposed. The conventional example described in Patent Document 1 is a lighting fixture that is embedded in a system ceiling, and includes a plurality of LEDs that are two-dimensionally arranged on a substrate and a cover that covers the entire LEDs. And this illuminating device is a lens which distributes the light of LED toward the side surface (ceiling surface) of a cover facing the emitting surface of LED located in the outermost periphery among a plurality of LEDs arranged two-dimensionally. It has. That is, a feeling of brightness can be ensured by irradiating the light from the LEDs located on the outermost periphery toward the ceiling.

JP 2013-4191 A

  However, in the conventional example described in Patent Document 1, the LED that irradiates light on the floor surface and the LED that irradiates light on the ceiling surface are separately independent, and a dedicated lens is required for each LED. There is a problem that it is difficult to miniaturize the lighting fixture itself.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the brightness of an illumination space while reducing the size.

The lighting fixture of the present invention is arranged in front of the fixture body in the light emitting direction of the light source, the light source having a light emitting element, the fixture main body in which the light source is arranged, and emitted from the light source extraction surface. A light distribution control member for controlling light distribution. The light distribution control member is a boundary surface between the incident surface facing the extraction surface and receiving the light, the medium portion where the light incident from the incident surface travels, and the outside of the medium portion. A plurality of emission surfaces from which light is emitted and a reflection surface that is a boundary surface between the outside of the medium portion and totally reflects the light to the medium portion. The incident surface is a flat surface parallel to the extraction surface. The exit surface includes a first exit surface that faces the entrance surface across the medium portion, and a cylindrical second exit surface that surrounds the first exit surface and the reflection surface. The reflection surface is an inclined surface that is inclined from the periphery of the first emission surface toward the front end of the second emission surface. In the light distribution control member, a gap where the medium portion does not exist is provided on a path along which a part of the light totally reflected by the reflection surface travels. A surface of the air gap facing the reflection surface is an inclined surface that is inclined in a direction away from the reflection surface as the distance from the light source is increased.

  In this lighting fixture, it is preferable that the gap has irregularities formed on the boundary surface with the medium portion.

  In this lighting fixture, it is preferable to include a reflector that reflects light extracted from the extraction surface toward the front.

  In the lighting fixture of the present invention, the light distribution control member is a boundary surface with the outside of the medium portion, and is a boundary surface between the plurality of emitting surfaces from which the light is emitted and the outside of the medium portion, and the light is transmitted through the medium. And a reflective surface for total reflection. Further, in the lighting fixture of the present invention, the incident surface is a flat surface parallel to the extraction surface, the output surface is a first output surface that faces the input surface across the medium portion, and the first output surface and the reflective surface. And a cylindrical second emission surface. Furthermore, the lighting fixture of this invention consists of an inclined surface in which a reflective surface inclines toward the front end of a 2nd output surface from the periphery of a 1st output surface. Therefore, the lighting fixture of the present invention can irradiate both floor and ceiling surfaces with a single light source, and can improve the brightness of the lighting space while reducing the size. There is an effect.

It is sectional drawing which shows embodiment of the lighting fixture which concerns on this invention. It is an exploded perspective view same as the above. It is a cross-sectional perspective view same as the above. (a) is a cross-sectional view in which a part thereof is omitted, and (b) is a cross-sectional view of a main part of the light distribution control member in the same as above. It is explanatory drawing for demonstrating a light distribution characteristic same as the above. It is explanatory drawing for demonstrating the experimental result in the same as the above. It is explanatory drawing for demonstrating the experimental result in the same as the above.

  Hereinafter, an embodiment in which the technical idea of the present invention is applied to a ceiling-embedded lighting device (downlight) will be described in detail with reference to the drawings. However, the lighting fixture to which the technical idea of the present invention can be applied is not limited to a downlight, and can be applied to any lighting fixture such as a lighting fixture embedded in a wall.

  The lighting fixture of this embodiment is comprised by the light source 1, the fixture main body 2, the light distribution control member 3, the reflection member 4, the attachment board 5, etc. as shown in FIGS. 1-3. In the following description, unless otherwise specified, the respective directions of up, down, left, and right in FIG. 2 are defined. Specifically, the term “upper” in the present embodiment refers to the side on which the instrument body is attached, and the term “lower” refers to the direction opposite to the side on which the instrument body is attached.

  The light source 1 is a member that constitutes a light emitting unit of a lighting fixture. In the present embodiment, a so-called COB (Chip On Board) type LED light source is employed, and a plurality of LEDs mounted on the substrate have a structure in which the LEDs are collectively sealed by a sealing member including a phosphor.

  As shown in FIG. 3, the light source 1 of the present embodiment is configured to extract light (for example, white light) from a circular extraction surface (light emitting surface) 10 in plan view. Thus, the light source 1 having a circular extraction surface is uniformly irradiated with light emitted from the LEDs in all directions, so that the uniformity is improved and the luminance unevenness is kept low. It is particularly useful as a light source for downlights, etc. where importance is attached. However, the present invention is not particularly limited to the shape and type of the light source 1. On the other hand, as will be described later, in the light distribution control member of the present invention, when the light emitted from the light source 1 is made approximately the same as the shape of the incident surface on which the light is incident, the light incident efficiency is improved and an efficient lighting fixture is obtained. Since it can provide, it is preferable.

  The instrument body 2 is formed in a cylindrical shape by aluminum die casting, and a cylindrical fixing base 20 is projected from the center of the front surface (lower surface). Then, the light source 1 is fixed to the lower surface of the fixing base 20 via the heat dissipation sheet 6. The instrument body 2 is provided with a through hole 21 penetrating in the vertical direction. Further, a plurality of screw holes 22 are provided on the upper surface of the instrument body 2.

  The reflecting member 4 is formed by integrally forming a cylindrical outer shell 40 and a conical reflecting plate 41 inclined upward from the lower end of the outer shell 40 toward the center of the outer shell 40 as a synthetic resin molded body. The reflecting member 4 is fixed to the instrument body 2 by an appropriate method such as adhesion or screwing so that the upper end of the outer shell 40 is brought into contact with the lower surface of the instrument body 2. The bottom surface of the reflection plate 41 is open, and the light emitting surface 10 of the light source 1 is exposed to the outside through this opening.

  The mounting plate 5 was bent upward from the rectangular top plate 50 to which the instrument body 2 is screwed, a pair of side plates 51 protruding downward from the left and right ends of the top plate 50, and the lower ends of the side plates 51. The contact piece 52 is integrally formed by bending a metal plate. A plurality of screw insertion holes 500 pass through the top plate 50, and the mounting plate 5 is attached to the instrument main body 2 by screwing the screws inserted into the screw insertion holes 500 into the screw holes 22 of the instrument main body 2. The top plate 50 is provided with a through hole 501 that communicates with the through hole 21 of the instrument body 2. That is, a power supply line that connects the power supply device (not shown) and the light source 1 is inserted into the through hole 501 and the through hole 21, and power is supplied from the power supply device to the light source 1 through the power supply line.

  The light distribution control member 3 is made of organic glass such as acrylic resin or polycarbonate resin, or inorganic glass such as silicate glass or quartz glass, and is formed in a truncated cone shape as a whole. In the light distribution control member 3, a portion formed of organic glass or inorganic glass is referred to as a medium portion 30. Since it is desirable that the material for forming the light distribution control member 3 has a high visible light transmittance, acrylic resin is more preferable than polycarbonate resin in the case of organic glass. Moreover, from the viewpoint of ease of processing and manufacturing cost, organic glass is preferable to inorganic glass. For this reason, the light distribution control member 3 in this embodiment is formed of an acrylic resin.

  In the light distribution control member 3, a cylindrical tube portion 31 protrudes upward from the center of the upper surface, and a recess 32 is formed around the tube portion 31 on the upper surface. That is, in the present embodiment, the recess 32 corresponds to a gap.

  The cylindrical portion 31 has an inner diameter that is slightly larger than the outer diameter of the outer shell 40 of the reflecting member 4 and a depth that is substantially the same as the height of the outer shell 40. Stored. In addition, a pair of fitting holes 310 penetrates through the cylindrical portion 31, and a pair of claws 42 protruding from the outer peripheral surface of the outer shell 40 are fitted into the fitting holes 310 (see FIGS. 1 and 3). . That is, the light distribution control member 3 is coupled to the instrument body 2 by fitting the fitting hole 310 of the cylindrical portion 31 and the claw 42 of the reflecting member 4.

  Light emitted from the light emitting surface 10 of the light source 1 enters the medium portion 30 from the inner bottom surface of the cylindrical portion 31. That is, in the light distribution control member 3 in the present embodiment, the inner bottom surface (flat surface) of the cylindrical portion 31 becomes the incident surface 33.

  A conical recess is formed on the lower surface of the light distribution control member 3. The upper bottom surface of the recess facing the incident surface 33 is circular, and serves as an output surface (first output surface) 34 from which the light traveling through the medium unit 30 is output to the outside of the medium unit 30. The first emission surface 34 may be a flat surface or a downwardly convex curved surface. Further, the peripheral surface excluding the upper surface and the lower surface of the light distribution control member 3 becomes the second emission surface 35. Further, an inclined surface (a peripheral surface of the recess excluding the upper bottom surface) that inclines from the peripheral edge of the first emission surface 34 toward the front end (lower end) of the second emission surface 35 becomes the reflection surface 36. However, the reflection surface 36 is formed in a curved surface shape such as a paraboloid shape so that light traveling through the medium portion 30 is totally reflected by the medium portion 30.

  In the lighting fixture of the present embodiment, as shown in FIG. 1, the fixture body 2 is disposed on the ceiling plate 7 (back of the ceiling) using the mounting plate 5, and passes through the embedded holes 70 provided in the ceiling plate 7. A part of the reflection member 4 protrudes downward from the ceiling plate 7. The light distribution control member 3 is coupled to the reflecting member 4 by inserting the cylindrical portion 31 from below the ceiling plate 7 into the embedding hole 70. That is, in the lighting fixture of this embodiment, the light distribution control member 3 is exposed on the lower surface side of the ceiling material 7.

  As shown in FIG. 4A, the light emitted from the light emitting surface 10 of the light source 1 is incident on the incident surface 32 of the light distribution control member 3 directly or after being reflected by the reflecting plate 41 of the reflecting member 4. Advancing through the medium portion 30, most of the light exits from the first exit surface 34 and is irradiated onto the floor surface. Further, a part of the light traveling through the medium part 30 is totally reflected by the reflection surface 36 of the light distribution control member 3 and travels through the medium part 30, is emitted from the second reflection surface 35, and is emitted from the ceiling surface (ceiling plate 7 Is irradiated on the lower surface.

  FIG. 5 shows the light distribution characteristics of this embodiment, and represents the relationship between the angle and the luminous intensity (unit: candela) when the normal direction of the ceiling surface is 0 degree. However, the light intensity is normalized with the maximum light intensity. As can be seen from the light distribution characteristics of FIG. 5, the lighting fixture of the present embodiment emits sufficient light downward (floor surface) and has moderate light on the ceiling surface (portion where the angle is close to ± 90 degrees). Can be irradiated.

  By the way, if the reflection surface 36 is enlarged, the light emitted from the second emission surface 35 increases and the ceiling surface becomes relatively bright, but the light emitted at an angle smaller than ± 90 degrees also increases, so the glare Will increase. On the contrary, if the reflecting surface 36 is made small, the light emitted from the second emitting surface 35 decreases and the ceiling surface becomes relatively dark, but the light emitted at an angle smaller than ± 90 degrees decreases. Glare decreases.

  Therefore, the present inventor uses the ratio ψ = φ2 / φ1 between the diameter φ1 of the light emitting surface 10 of the light source 1 and the diameter φ2 of the first emission surface 34 as a parameter, and the light distribution characteristic when the ratio ψ is changed. As a result of an experiment (simulation) for comparing the above, results as shown in FIGS. 6 and 7 were obtained. That is, since the maximum diameter of the reflecting surface 36 (the diameter of the second reflecting surface 35) is constant, the larger the ratio ψ, the smaller the relative size (area) of the reflecting surface 36.

  The horizontal axis of FIG. 6 shows the same angle as in FIG. 5 (however, only on the minus side), and the vertical axis shows the luminous intensity (unit: candela). In FIG. 6, the light distribution characteristic when the ratio ψ = 1.72 is indicated by a broken line α, and the light distribution characteristic when the ratio ψ = 2.70 is indicated by a solid line β. Further, according to the experiment by the present inventor, for example, when the ceiling height is 3 m and a person with a height of 172 cm looks up at the ceiling at a position 10 m away from the lighting fixture in the horizontal direction, the ceiling faces downward by 8 degrees (angle = − It was found that it felt dazzling when the light intensity toward (82 degrees) was more than 5 candela.

  FIG. 7 shows the light distribution in the angular range (approximately −89 degrees to −77 degrees) having a large effect on glare (glare) in the two light distribution characteristics (broken line α and solid line β) shown in FIG. The characteristics are shown enlarged. In FIG. 7, an alternate long and short dash line γ indicates an ideal light distribution characteristic in which glare is suppressed and sufficient light is applied to the ceiling surface.

  As can be seen from FIG. 7, the light distribution characteristic (broken line α) when the ratio ψ = 1.72 deviates significantly from the ideal light distribution characteristic (single-dot broken line γ), and the luminous intensity is almost in the entire angular range. Is more than 5 candela, and it is thought that the range in which glare (glare) is felt is widened.

  On the other hand, the light distribution characteristic (solid line β) when the ratio ψ = 2.70 is closer to the ideal light distribution characteristic (one-dot broken line γ) than the light distribution characteristic of the broken line α, and is from −85 degrees to −77 degrees. It is considered that the range of brightness is about 5 candela or less, and the range in which glare (glare) is felt is narrow. That is, according to an experiment conducted by the present inventor, it was found that the ceiling surface can be irradiated with sufficient light while suppressing glare by setting the ratio ψ to 2 or more, preferably about 2.7. .

  As described above, the lighting fixture of the present embodiment is disposed in front of the fixture body 2 in the light source 1 having a light emitting element (LED), the fixture body 2 in which the light source 1 is arranged, and the light emission direction of the light source 1. And a light distribution control member 3 for controlling the light distribution of the light emitted from the extraction surface 10 of the light source 1. The light distribution control member 3 includes an incident surface 33 that faces the extraction surface 10 and receives the light, and a medium portion 30 through which the light incident from the incident surface 33 travels. The light distribution control member 3 is a boundary surface between the outside of the medium portion 30 and the plurality of exit surfaces from which the light exits, and the boundary surface between the outside of the medium portion 30 and transmits the light to the medium portion 30. And a reflecting surface 36 that totally reflects. The incident surface 33 is a flat surface parallel to the extraction surface 10. The exit surface includes a first exit surface 34 that faces the entrance surface 33 with the medium portion 30 interposed therebetween, and a cylindrical second exit surface 35 that surrounds the first exit surface 34 and the reflection surface 36. The reflection surface 36 is an inclined surface that is inclined from the peripheral edge of the first emission surface 34 toward the front end of the second emission surface 35.

  Since the lighting fixture of the present embodiment is configured as described above, one light source 1 can irradiate both the floor surface and the ceiling surface with necessary and sufficient light. As a result, the lighting fixture of the present embodiment can improve the feeling of brightness in the illumination space while reducing the size as compared with the conventional example described in Patent Document 1.

  Further, the light distribution control member 3 in the lighting fixture of the present embodiment is provided with a gap (recess 32) where the medium portion 30 does not exist on the path along which a part of the light totally reflected by the reflecting surface 36 travels. Is preferred. In other words, by providing the gap (recess 32), it is possible to control the light distribution when passing through the gap (recess 32) so that the angle of the light emitted from the second emission surface 35 approaches ± 90 degrees. As a result, there is an advantage that the uniformity of the brightness (illuminance) of the ceiling surface is improved as compared with the case where no gap (recess 32) is provided.

  Here, if the bottom surface of the air gap (concave portion 32) is a curved surface, it is considered that the total reflection at the boundary surface between the medium portion 30 and the bottom surface of the concave portion 32 and the light emitted from the reflecting surface 36 increase. When the light emitted from the reflection half 36 increases in this way, there is a possibility that the degree of uniformity of the light irradiated on the floor surface is lowered. On the other hand, in the present embodiment, since the bottom surface of the gap (recess 32) is a flat surface, it is possible to suppress a decrease in the uniformity of the light irradiated on the floor surface. Alternatively, as shown in FIG. 4B, if the bottom surface of the gap (concave portion 32) is an inclined surface that is inclined upward, the uniformity of light irradiated on the ceiling surface can be improved. There is.

  Furthermore, in the lighting fixture of the present embodiment, it is preferable that the gap (concave portion 32) has irregularities formed on the boundary surface with the medium portion 30. By forming irregularities on the boundary surface between the gap (recess 32) and the medium part 30, the light passing through the gap (recess 32) is diffused, further improving the uniformity of the light irradiated on the ceiling surface. can do. However, it is preferable to form irregularities only on the boundary surface on the side where the light that has traveled through the gap (the concave portion 32) enters the medium portion 30, rather than forming irregularities on the entire boundary surface. Such irregularities can be easily formed, for example, by applying a texture or dimple process to the recess 32.

  Moreover, it is preferable to provide a reflector 41 that reflects light extracted from the extraction surface (light emitting surface) 10 toward the front (downward) as in the lighting fixture of the present embodiment. When the reflection plate 41 is not provided, it is difficult to control the light distribution of the light extracted from the extraction surface (light emitting surface) 10 and passing through the cylindrical portion 31 of the light distribution control member 3. Therefore, if the reflector 41 is provided as in the present embodiment, the light extracted from the extraction surface (light emitting surface) 10 can be efficiently incident on the incident surface 33, and the glare is suppressed and the uniformity is improved. Can be achieved. Further, in the present embodiment, since the reflection plate 41 is formed so as to surround the front, rear, left and right of the light emitting surface 10 over the entire circumference, the light utilization efficiency can be improved.

  In the light distribution control member 3, the boundary portion (the outer peripheral portion of the lower surface) between the second emission surface 35 and the reflection surface 36 may be a flat surface or a curved surface. Further, it is desirable that the center of the incident surface 33 and the center (optical axis) of the light emitting surface 10 of the light source 1 coincide with each other, but the desired light distribution characteristics (see FIG. 4) can be obtained even if they are slightly deviated. It is possible to realize.

DESCRIPTION OF SYMBOLS 1 Light source 2 Instrument body 3 Light distribution control member
10 Extraction surface
30 Medium part
33 Incident surface
34 First exit surface
35 Second exit surface
36 Reflective surface

Claims (3)

A light source having a light emitting element, an instrument main body in which the light source is arranged, and a light distribution direction of light emitted from a light extraction surface of the light source disposed in front of the instrument main body in the light emitting direction of the light source. A light distribution control member,
The light distribution control member is a boundary surface between the incident surface facing the extraction surface and receiving the light, the medium portion where the light incident from the incident surface travels, and the outside of the medium portion. A plurality of emission surfaces from which light is emitted; and a reflection surface that is a boundary surface with the outside of the medium part and totally reflects the light to the medium part;
The incident surface is a flat surface parallel to the extraction surface,
The exit surface has a first exit surface facing the entrance surface across the medium portion, and a cylindrical second exit surface surrounding the first exit surface and the reflection surface,
The reflecting surface is Ri Do from the inclined surface which is inclined toward the front end of the second emission surface from the peripheral edge of the first output surface,
The light distribution control member is provided with a gap where the medium portion does not exist on a path along which a part of the light totally reflected by the reflection surface travels.
The lighting apparatus according to claim 1, wherein a surface of the air gap facing the reflection surface is an inclined surface that is inclined in a direction away from the reflection surface as the distance from the light source is increased . The lighting device according to claim 1 , wherein the gap is formed with irregularities on a boundary surface with the medium portion . According to claim 1 or 2 luminaire according, characterized in that it comprises a reflector for reflecting light extracted from the extraction surface forward.

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