WO2016194930A1 - 光源ユニット、及び照明器具 - Google Patents

光源ユニット、及び照明器具 Download PDF

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Publication number
WO2016194930A1
WO2016194930A1 PCT/JP2016/066132 JP2016066132W WO2016194930A1 WO 2016194930 A1 WO2016194930 A1 WO 2016194930A1 JP 2016066132 W JP2016066132 W JP 2016066132W WO 2016194930 A1 WO2016194930 A1 WO 2016194930A1
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WIPO (PCT)
Prior art keywords
light
angle
light source
light distribution
source unit
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Application number
PCT/JP2016/066132
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English (en)
French (fr)
Japanese (ja)
Inventor
小川　大輔
Original Assignee
岩崎電気株式会社
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Application filed by 岩崎電気株式会社 filed Critical 岩崎電気株式会社
Publication of WO2016194930A1 publication Critical patent/WO2016194930A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity

Definitions

  • the present invention relates to a light source unit capable of changing light distribution and a lighting fixture.
  • Patent Document 1 discloses a technique for variably configuring a reflecting mirror to obtain a wide-angle, medium-angle, and narrow-angle light distribution.
  • Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for combining a plurality of types of fly-eye lenses to form a final light distribution pattern as the entire irradiation light.
  • Patent Document 3 in addition to a reflector, a light distribution pattern is changed as necessary by providing a reflector for adjusting an irradiation angle that is selected and mounted on the reflector and changes the light irradiation angle of the light source. Technology is shown.
  • the present invention provides a light emitting unit, a reflecting mirror that surrounds the light emitting unit and distributes light of the light emitting unit at a wide angle, and is selectively provided on the reflecting mirror.
  • a light source unit comprising: a transmissive optical element that distributes outgoing light emitted from an outgoing opening of a mirror to a middle angle.
  • the reflection mirror has a 1 ⁇ 2 beam angle of the wide-angle light distribution around the optical axis, or more than the 1 ⁇ 2 beam angle of the radiated light of the light emitting unit. A corresponding range of light is emitted directly by light.
  • the present invention is characterized in that, in the light source unit, the reflection mirror presses a substrate on which the light emitting unit is provided.
  • the transmissive optical element includes an element main body provided at an output opening of the reflection mirror, and light incident from the output opening is provided on a surface of the element main body. Irregularities that refract in a direction approaching the optical axis and distribute light to the middle angle are formed.
  • the present invention is also characterized in that, in the light source unit, the transmissive optical element has a curved surface shape with a predetermined curvature radius at the lowest point of the concave and convex portions and the apex of the convex portion.
  • the present invention is characterized in that, in the light source unit, the transmissive optical element is provided with a hole that is open around the optical axis.
  • the present invention is also characterized in that, in the light source unit, the light emitting section is a planar light source.
  • the present invention also provides a lighting apparatus comprising the light source unit according to any one of the above, a housing in which the light source unit is built, and a globe provided in the housing.
  • the present invention includes any one of the light source units described above, a housing incorporating the light source unit, and a globe provided in the housing, and the transmissive optical element is provided in the globe.
  • a lighting apparatus characterized by the above.
  • the transmissive optical element on the reflection mirror by providing the transmissive optical element on the reflection mirror, the outgoing light emitted from the reflection mirror can be easily changed to a medium-angle light distribution. Further, the reflection mirror can be used in common for the wide-angle light distribution and the medium-angle light distribution. In addition, since the reflection mirror distributes light at a wide angle, the height of the reflection mirror can be suppressed even when the light emitting unit is large, compared to a configuration in which the reflection mirror distributes light at an intermediate angle.
  • FIG. 1 is a perspective view showing an overall configuration of a high ceiling lighting apparatus according to an embodiment of the present invention.
  • 2A and 2B are diagrams illustrating a configuration of a high ceiling lighting fixture, in which FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a bottom view.
  • FIGS. 3A and 3B are diagrams showing the configuration of the luminaire main body with the top plate removed, where FIG. 3A is a plan view, FIG. 3B is a side view, and FIG. 3C is a bottom view.
  • 4A and 4B are diagrams showing the configuration of the ring, where FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along line AA in FIG.
  • FIG. 4A, and FIG. 4C is an enlarged view of a portion indicated by an arrow B in FIG.
  • FIG. 5 is an assembly diagram of the high ceiling lighting fixture.
  • FIG. 6 is a perspective view showing the configuration of the illumination unit.
  • FIG. 7 is a plan view of the lighting unit.
  • 8 is a cross-sectional view taken along the line CC of FIG.
  • FIG. 9 is an exploded perspective view of the lighting unit.
  • FIG. 10 is a diagram illustrating a technique for changing the light distribution of the lighting unit.
  • FIG. 11 is a diagram schematically showing the configuration of the illumination unit.
  • FIG. 12 is a ray diagram of the light source unit.
  • FIG. 13 is a light distribution diagram showing a simulation result of the wide-angle light distribution of the illumination unit.
  • FIG. 10 is a diagram illustrating a technique for changing the light distribution of the lighting unit.
  • FIG. 11 is a diagram schematically showing the configuration of the illumination unit.
  • FIG. 12 is a ray
  • FIG. 14 is a diagram schematically illustrating a configuration of an illumination unit in which a reflection mirror is provided with a medium-angle light distribution lens.
  • FIG. 15 is an enlarged cross-sectional view of a medium-angle light distribution lens.
  • FIG. 16 is an explanatory diagram of the formation of the curved surface of the medium-angle light distribution lens surface unevenness.
  • FIG. 17 is a diagram illustrating the relationship between the apex of the medium-angle light distribution lens and the radius of curvature R of the lowest point and the actually measured value of the 1/2 beam angle of the illumination unit.
  • FIG. 18 is a diagram showing the relationship between the diameter ⁇ of the hole of the medium-angle light distribution lens and the actually measured value of the 1/2 beam angle of the illumination unit.
  • FIG. 19 is a light distribution diagram showing a simulation result of the medium angle light distribution of the lighting unit.
  • FIG. 20 is a perspective view of an illumination unit for medium angle light distribution.
  • FIG. 21 is an exploded view of a lighting unit for medium-angle light distribution.
  • FIG. 22 is a perspective view of a lens unit for medium angle light distribution.
  • Ceiling light fixtures are devices that are installed suspended from the ceiling surface of a building and illuminate the interior of a room. Equipment installed on the ceiling of warehouses, gymnasiums, etc.
  • FIG. 1 is a perspective view showing an overall configuration of a high ceiling lighting fixture 1 according to the present embodiment.
  • 2A and 2B are diagrams showing the configuration of the high ceiling lighting apparatus 1
  • FIG. 2A is a plan view
  • FIG. 2B is a side view
  • FIG. 2C is a bottom view.
  • the high ceiling lighting device 1 includes a lighting device body 2, an electric circuit box 3, and a fixture 4.
  • the lighting fixture body 2 includes a plurality of (in the illustrated example, two) lighting units 10, a top plate 12, and a ring-shaped outer frame 14.
  • the lighting units 10 are suspended from the top plate 12, and The lower end side is surrounded by the ring-shaped outer frame 14.
  • the illumination unit 10 is a unit that includes a light source and includes a light emitting unit 11 that emits light from the light source.
  • the top plate 12 is a disk-shaped plate material, has sufficient rigidity to support the weight of the plurality of lighting units 10, and the plurality of lighting units 10 are suspended from the lower surface 12 ⁇ / b> A of the top plate 12.
  • a light emitting unit 11 is located at the lower end of the lighting unit 10, and the room is illuminated by light emitted from the light emitting unit 11.
  • the ring-shaped outer frame 14 is an annular member that surrounds the lower ends of the plurality of lighting units 10 together.
  • the electric circuit box 3 is a substantially rectangular parallelepiped box containing an electric circuit required for blinking of the light source included in the illumination unit 10.
  • a light emitting element is used as a light source of the lighting unit 10
  • an electric circuit box 3 includes a power supply circuit that supplies DC power to the light emitting element, and a control circuit that controls blinking and dimming. Is contained.
  • various electric circuits can be housed in the electric circuit box 3.
  • the electric circuit box 3 is placed and fixed on the upper surface 12 ⁇ / b> B (FIG. 2A) of the top plate 12 of the lighting device body 2.
  • the electric circuit box 3 is not provided in the lighting device body 2, but is placed separately from the lighting device body 2, and the electric circuit box 3 and the lighting device body 2 are wired. good.
  • the fixture 4 is a part that fixes the lighting fixture body 2 to the ceiling surface of the building, and is fixed to the top plate 12 of the lighting fixture body 2. As shown in FIGS. 1 and 2, a U-shaped arm-shaped metal fitting is used for the fixture 4. Instead of this arm-type metal fitting, a rod-like member or chain member that hangs down from the ceiling surface and is connected to the luminaire main body 2 at the lower end may be used as the fixture 4.
  • FIG. 3 is a diagram showing the configuration of the lighting fixture body 2 with the top plate 12 removed
  • FIG. 3 (A) is a plan view
  • FIG. 3 (B) is a side view
  • FIG. 3 (C) is a bottom view.
  • the luminaire main body 2 includes the ring-shaped outer frame 14 and a connector 16 as members for connecting a plurality of lighting units 10 to each other.
  • the flange portion 11 ⁇ / b> A constituting the exit opening end portion of the light emitting portion 11 is fastened to the ring-shaped outer frame 14 with screws 15 as shown in FIG. Has been. Further, as shown in FIGS.
  • all the illumination units 10 are connected to each other by a connector 16 disposed in the center of the array of the illumination units 10 in plan view.
  • the connecting tool 16 is a plate-like member that connects the lighting units 10 to each other by screwing the flange portion 11A of the lighting unit 10 disposed around the connecting tool 16. This prevents the lighting unit 10 from being individually glazed, so that even when installed in a place with a lot of vibration, such as a factory or a gymnasium, the lighting unit 10 will individually glaze and collide with each other. Is suppressed.
  • the high ceiling lighting fixture 1 since the high ceiling lighting fixture 1 is installed in a ceiling surface with high ceiling height, a general consumer will visually recognize the bottom face of the high ceiling lighting fixture 1 exclusively.
  • the ring-shaped outer frame 14 borders the plurality of lighting units 10, so that these lighting units 10 have a sense of unity. It is possible to give aesthetics to general consumers.
  • the height H of the ring-shaped outer frame 14 is sufficient so that the side surfaces of the respective lighting units 10 are exposed to the outside in the side view of the lighting fixture body 2. The degree of exposure is limited. Thereby, each heat
  • FIGS. 4B and 4C are diagrams showing the configuration of the ring-shaped outer frame 14, FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along the line AA in FIG. 4A, and FIG. It is an enlarged view of the site
  • the ring-shaped outer frame 14 has an annular shape in plan view, and as shown in FIGS. 4B and 4C, an annular plate-shaped top frame 14 is formed. It has a surface portion 17 and a side surface portion 18 formed by vertically bending the outer peripheral edge of the top surface portion 17 and has an L-shaped cross section. The rigidity is improved because the cross section is L-shaped.
  • a plurality of screw holes 19 are provided in the top surface portion 17 of the ring-shaped outer frame 14, and each of the illumination units 10 is coupled to the ring-shaped outer frame 14 by screws 15 passed through the screw holes 19.
  • FIG. 5 is an assembly diagram of the high ceiling lighting fixture 1.
  • the plurality of lighting units 10 are coupled to each other by the ring-shaped outer frame 14 and the connector 16, and the lighting units 10 are individually supported on the top plate 12 by the support bolts 7. .
  • the high ceiling lighting fixture 1 has a configuration in which the lighting units 10 are individually fixed to the top plate 12 in addition to the configuration in which the lighting units 10 are coupled to each other.
  • the lighting unit 10 is prevented from falling off.
  • FIG. 6 is a perspective view showing the configuration of the illumination unit 10, and FIG. 7 is a plan view of the illumination unit 10. 8 is a cross-sectional view taken along the line CC of FIG.
  • FIG. 9 is an exploded perspective view of the lighting unit 10.
  • the illumination unit 10 includes a housing 20 that is a unit main body and a globe 21.
  • the housing 20 is formed by aluminum die casting, and includes a bottomed cylindrical main body 22.
  • the main body 22 includes a light source 25 of the illumination unit 10.
  • a reflective cover 26 as a light control body.
  • the opening end of the exit opening of the main body portion 22 is formed in a flange shape, and the flange portion 11A of the light exit portion 11 is configured.
  • a transparent substantially disk-like globe 21 is fixed to the flange portion 11A with screws.
  • the globe 21 is fixed to the flange portion 11A with the packing 27 interposed therebetween, thereby closing the emission opening of the main body portion 22 in a waterproof state.
  • a glass material or a transparent resin material that can obtain a high waterproof property relatively easily is used.
  • the light source 25 includes a substantially rectangular light source substrate 29, and a light emitting unit 30 is provided on the light source substrate 29.
  • the light emitting unit 30 is formed by assembling a plurality of LEDs and mounting them on the light source substrate 29, and is a planar light source such as a COB (Chip on board) type LED light source. That is, in the COB type LED, a light emitting surface is configured by a large number of LEDs (light emitting elements) arranged closely, and also in this light emitting unit 30, a light emitting surface 30A is configured by a set of a plurality of LEDs.
  • COB Chip on board
  • the light emitting surface 30A is disposed at substantially the center of the light source substrate 29 and has a circular shape in plan view having a predetermined area, and the optical axis K is perpendicular to the light emitting surface 30A.
  • the number of light sources 25 corresponding to the design value of the light output of the illumination unit 10 is arranged on the mounting base 24 provided in a convex shape on the bottom surface 23 of the housing 20. Since the plurality of light sources 25 are respectively provided on the convex mounting base 24, heat transfer in the in-plane direction of the bottom surface 23 is weaker than when these light sources 25 are provided in the same surface of the bottom surface 23. It is done.
  • the reflection cover 26 integrally includes a reflection mirror 32 provided for each light source 25, and controls the emitted light of the light source 25.
  • the housing 20 includes a heat radiating fin unit 40 and a support leg unit 41 on the upper surface 22A (FIG. 7) of the main body 22.
  • the radiating fin unit 40 is formed of a thin plate material having high thermal conductivity.
  • the radiating fin unit 40 is integrally provided with a large number of metal plate-like radiating fins 42, and is fixed to the upper surface 22 ⁇ / b> A of the main body 22 with screws.
  • the support leg unit 41 includes two support legs 44 fixed to the top plate 12 with support bolts 7, and includes a plate-like fin portion 45 between the two support legs 44. ing.
  • the support leg unit 41 is made of aluminum die casting, like the main body part 22 of the housing 20, and high heat dissipation is obtained with the fin part 45, and the support leg 44 is connected with the fin part 45, thereby providing high rigidity. It is secured.
  • fin portions 47 are erected on the upper surface 22 ⁇ / b> A of the main body portion 22 so as to surround the radiating fin unit 40.
  • These fin portions 47 are integrally molded as a part of the main body portion 22 by aluminum die casting, and high rigidity and heat dissipation are ensured.
  • the radiating fin unit 40 is guarded by the fin portion 47.
  • the lighting unit 10 is configured such that the light distribution can be changed between a wide angle and a medium angle while using the same housing 20.
  • FIG. 10 is a diagram illustrating a technique for changing the light distribution of the lighting unit 10. As shown in the figure, there are at least five methods (A) to (E) as methods for changing the light distribution of the lighting unit 10.
  • Method (A) is a method in which a reflection mirror 32 designed for each of wide-angle and medium-angle light distributions is prepared, and a wide-angle or medium-angle light distribution is obtained by selecting the reflection mirror 32 built in the housing 20. It is.
  • This method (A) has the following drawbacks. That is, the height Hm of the reflection mirror 32 for medium angle light distribution is larger than that of the reflection mirror 32 for wide angle light distribution. For this reason, when using the same housing
  • a dedicated reflecting mirror 32 is required for each of the wide-angle and medium-angle light distributions, which increases costs.
  • casing 20 is an excessively large size with respect to the reflective mirror 32 for wide angle light distribution, the distance La from the front-end
  • These drawbacks become more prominent as the light emitting surface 30A of the light emitting unit 30 serving as the light emitting unit of the light source 25 becomes larger.
  • a lens 50 using the total reflection phenomenon on the side surface designed for each of the wide-angle and medium-angle light distributions is prepared, and the lens 50 built in the housing 20 is selected to select the wide-angle or medium-angle lens.
  • This method (B) has the following drawbacks. That is, the lens 50 for medium-angle light distribution has a height Hm that is larger than that of the lens 50 for wide-angle light distribution, as in the method (A). For this reason, it has the same fault as the fault which method (A) has. In addition, the larger the light source area, the larger the overall size of the thick lens, and thus the relatively high lens molding manufacturing cost.
  • the globe 21 including the lens unit 52 designed for each of the wide-angle and medium-angle light distribution is prepared, and the globe 21 provided on the housing 20 is selected to obtain a wide-angle and medium-angle light distribution. It is a technique.
  • the lens includes a case similar to a Fresnel lens. This method (C) is advantageous in reducing the number of parts by reducing the number of parts because the lens portion 52 as a light distribution control member is provided integrally with the globe 21.
  • the light source 25 is a COB type or SMD (Surface Mount Device) type LED, it has a Lambertian light distribution (cosine light distribution).
  • a wide-angle outgoing component having a large angle with respect to the optical axis K (that is, light emitted in the lateral direction) becomes stray light, and the loss at the inner surface of the housing 20 increases, resulting in poor light extraction efficiency by the optical system. Light control is difficult.
  • the material of the globe 21 is a glass material in order to improve the waterproofness of the opening of the housing 20, the formation of the globe 21 having the lens portion 52 is not easy and the cost becomes high.
  • the same reflection mirror 32 is used in common for the wide-angle and medium-angle light distributions, so that the parts are shared and the cost is reduced.
  • the reflecting mirror 32 is for wide-angle light distribution, if the transmissive optical element is thin, the height Hm can be suppressed as compared with the methods (A) to (C), and the housing The body 20 can be reduced in size and cost.
  • the medium-angle light distribution lens 55 has only to be manufactured by the number of light sources mounted in the illumination unit 10 with medium-angle light distribution, a further cost reduction effect can be expected.
  • the method (D) and the method (E) are more advantageous than the methods (A) to (C) in terms of downsizing and cost reduction of the casing 20.
  • the method (E) that can use flat glass for the globe 21 is employed in order to provide the casing 20 with waterproofness.
  • the lighting unit 10 using the method (E) will be described in more detail.
  • FIG. 11 is a diagram schematically showing the configuration of the illumination unit 10.
  • the light source 25 is fixed to a mounting base 24 protruding from the bottom surface 23 of the main body 22 of the housing 20 made of a high thermal conductivity material with a heat radiation sheet 63 interposed therebetween.
  • the reflection mirror 32 is integrally formed in a concave shape in the plane of the reflection cover 26 (FIG. 9) described above.
  • the light source 25 includes the light emitting unit 30, and the light emitting unit 30 includes the light emitting surface 30A like a COB type LED.
  • the reflecting mirror 32 includes a reflecting surface 62 that surrounds the entire circumference of the light emitting surface 30A around the optical axis K passing through the center O of the light emitting surface 30A.
  • the reflecting surface 62 has a truncated cone shape (so-called inverted truncated cone shape) in which the diameter of the tip 62B is larger than that of the bottom end 62A on the light emitting surface 30A side.
  • the light source unit 70 that includes these reflection mirrors 32 and the light source 25 and can change the light distribution of the illumination unit 10 is configured. Note that the shape of the reflecting surface 62 of the reflecting mirror 32 can be changed as appropriate according to the planar view shape, dimensions, and the like of the light emitting surface 30A.
  • the reflection mirror 32 presses the entire circumference of the bottom end 62 ⁇ / b> A in close contact with the light source substrate 29 of the light source 25 without any gap as the reflection cover 26 is attached to the housing 20. Thereby, leakage light from the gap between the bottom end 62 ⁇ / b> A of the reflection mirror 32 and the light source substrate 29 can be suppressed, and parts that press and fix the light source 25 to the housing 20 can be reduced.
  • the light source 25 includes the light emitting unit 30 that generates a relatively large amount of heat by arranging a plurality of LEDs together, the surface temperature of the light source substrate 29 becomes high during lighting. For this reason, the reflective mirror 32 is made of a material having high heat resistance and relatively high reflectance.
  • this material is a resin material such as polyarylate that has high heat resistance, is white, and has a reflective surface with a mirror surface that is higher in reflectance than the aluminum vapor-deposited surface.
  • a reflective silicon material for example, an optical reflective silicon material manufactured by Toray Dow Corning Co., Ltd .: MS-2002 can also be used.
  • portions other than the reflection mirror 32 of the reflection cover 26 do not come into contact with the light source substrate 29, so that it is not necessary to have the heat resistance performance as that of the reflection mirror 32. Therefore, different materials may be used for the reflection mirror 32 and the other portions of the reflection cover 26.
  • a material other than the reflecting mirror 32 for example, a resin material of polycarbonate can be cited.
  • FIG. 12 is a ray diagram of the light source unit 70.
  • the outgoing light emitted from the outgoing opening 33 at the tip 32A of the reflecting mirror 32 does not enter the reflective surface 62 of the radiated light of the light source 25 as shown in FIG.
  • the direct light emitted from is included. More specifically, the height Hf of the reflecting surface 62 of the reflecting mirror 32 is such that the radiated light component in the range of the angle ⁇ 1 with the optical axis K as the center out of the radiated light of the light source 25 is directly emitted. Is set.
  • the remaining component of the radiated light from the light source 25 is incident on the reflecting surface 62 inclined at an inclination ⁇ 2 with respect to the optical axis K, reflected, and emitted from the emission opening 33.
  • the inclination ⁇ 2 is set to an angle at which all the regular reflection light E, which is regularly reflected by the planar reflection surface 62 of the light beam emitted from the light source design center point, intersects the optical axis K. .
  • the angle ⁇ ⁇ b> 1 is the same as the target value of the 1/2 beam angle of the wide-angle light distribution of the illumination unit 10, or an angle greater than or equal to the target value of the 1/2 beam angle. More specifically, in the reflection mirror 32 formed of a white resin material, most of the reflected light from the reflection surface 62 becomes a diffuse reflection (diffuse reflection) component, so that the reflected light from the reflection surface 62 is mainly desired. It is difficult to get the light distribution accurately. On the other hand, the reflecting mirror 32 emits light having a target value of 1 ⁇ 2 beam angle of wide-angle light distribution or more than the target value of 1 ⁇ 2 beam angle as direct light of the light emitting unit 30.
  • the opening of the main beam of the illumination unit 10 is made relatively easily by direct light. Then, the diffuse reflected light from the reflecting surface 62 having the inclination ⁇ 2 compensates for the light flux around the optical axis K, that is, the gap between the main beams, so that a desired wide-angle light distribution can be obtained relatively easily.
  • the target value of the 1/2 beam angle is 90 degrees
  • the angle ⁇ 1 is 95.7 degrees.
  • the angle ⁇ 1 can be suitably set to a value up to about the target value of +1/2 beam angle +20 degrees.
  • the reflected light from the reflection surface 62 is a diffuse reflection component, a part of the reflected light returns to the light emitting unit 30 side or enters the inner surface of the housing 20 and is extracted outside. If not, light that is wasted increases and light utilization efficiency decreases. At this time, the reflected light around the optical axis K is weakened, so that the luminous intensity in the direction of the optical axis K is relatively increased, and the floor surface illuminance in the direction of the optical axis K tends to be an illuminance distribution that is excessively high.
  • the reflection surface 62 is mirror-finished, so that a regular reflection component in the reflected light is secured at a predetermined ratio (20% in this embodiment) or more, and a decrease in light use efficiency is suppressed. .
  • a desired wide-angle light distribution in which the light intensity in the direction of the optical axis K is suppressed from being excessively high is obtained.
  • the illumination unit 10 includes the light source unit 70 as a light source, and can illuminate a wide area with an appropriate illuminance without excessively increasing the illuminance of the floor directly below the surroundings when illuminating with wide-angle light distribution.
  • a regular reflection surface may be formed by vapor-depositing aluminum on the surface of the reflection surface 62 so that most of the reflected light becomes a regular reflection component.
  • the reflection cover 26 integrally provided with the reflection mirror 32 covers substantially the entire exit opening of the light exit section 11, and the globe 21 is provided thereon.
  • the reflective cover 26 has a surface facing the globe 21 formed as a reflective surface such as a mirror finish.
  • FIG. 14 is a diagram schematically illustrating a configuration of the illumination unit 10 in which the reflection mirror 32 is provided with the medium-angle light distribution lens 55.
  • the medium-angle light distribution lens 55 is a transmissive optical element that is selectively provided depending on whether or not the light distribution of the illumination unit 10 is changed to a medium angle, and the light emitted from the reflection mirror 32 is refracted to a medium angle by refraction.
  • Light distribution As described above, the light emitted from the reflection mirror 32 is a light beam including not only the total reflection light of the reflection surface 62 but also the direct light of the light emitting unit 30. In other words, the light passes through the opening of the tip 62B of the reflection mirror 32. Total luminous flux.
  • the medium-angle light distribution lens 55 includes a plate-like element body 56 formed of a light-transmitting resin material. Of the both surfaces of the element body 56, the surface 58 facing the globe 21 is Concavities and convexities are formed in which a plurality of concave portions 60 and convex portions 61 are arranged concentrically around the optical axis K. A so-called wavefront 59 extending around the optical axis K is formed by the unevenness.
  • FIG. 15 is an enlarged cross-sectional view of the medium-angle light distribution lens 55.
  • the wave front 59 of the surface 58 has an optical function of refracting incident light so that the angle with the optical axis K becomes small and distributing the light to the middle angle.
  • the convex portion 61 has inclined surfaces 61A and 61B on both sides of the apex 61T, and these inclined surfaces 61A and 61B do not have an angle of 90 degrees or more between the perpendicular to the surface and the optical axis K. Is inclined with respect to the optical axis K.
  • the inclined surface 61A closer to the optical axis K when viewed from the vertex 61T refracts the reflected light component Ma reflected by the reflecting surface 62 in a direction closer to the direction of the optical axis K than the incident direction.
  • the inclined surface 61B far from the optical axis K as viewed from the vertex 61T refracts the direct light component Mb of the light emitting unit 30 in a direction closer to the optical axis K direction than the incident direction.
  • the light emitted from the reflection mirror 32 is refracted so as to approach the direction of the optical axis K in each of the convex portions 61 when passing through the wavefront 59, and is distributed to the middle angle. It becomes.
  • FIG. 16 is an explanatory diagram for designing the wavefront 59 of the medium-angle light distribution lens 55.
  • a concave portion 60 and a convex portion 61 having a saw-like cross section like a Fresnel lens are first formed on the surface 58 of the medium angle light distribution lens 55.
  • the lowest point 60S of the concave portion 60 and the vertex 61T of the convex portion 61 are subjected to a process for making a cross-sectional curved surface shape having a predetermined radius of curvature R, so that the vertex 61T has a curved cross-sectional shape.
  • FIG. 17 is a diagram illustrating a simulation result of the relationship between the apex 61T of the medium-angle light distribution lens 55 and the curvature radius R of the lowest point 60S illustrated in FIG. 16 and the 1/2 beam angle of the illumination unit 10.
  • the value of the 1/2 beam angle increases, and the optical system efficiency (light The extraction efficiency is also increased.
  • the light distribution shape in the luminosity diagram becomes smoother as the radius of curvature R increases.
  • the radius of curvature R is set to the maximum value Tb in a range where the half beam angle value of the medium angle light distribution does not exceed the target value, so that the optical system efficiency is improved while obtaining the medium angle light distribution.
  • the tendency associated with the change in the radius of curvature R is that when the reflection surface 62 of the reflection mirror 32 built in the illumination unit 10 is a regular reflection surface that includes a regular reflection component in the reflected light, and the reflection surface 62 is a diffuse reflection component. It can be seen in any case where the diffuse reflection surface contains a large amount of.
  • the wavefront 59 is set so that the value of the 1 ⁇ 2 beam angle is smaller than the target value of the 1 ⁇ 2 beam angle of the medium angle light distribution.
  • the dimensions of the concave portion 60 and the convex portion 61 are set.
  • the plate thickness Pa is 2.5 mm
  • the intervals Pb1, Pb2, and Pb3 between the apexes 61T of the convex portions 61 are 3 mm, 2.5 mm, and 2.25 mm in order from the inner peripheral side.
  • the height Pc from the bottom surface of the medium-angle light distribution lens 55 to the apex 61T is 4.5 mm, and the diameter ⁇ of the hole 57 described later is 15 mm.
  • the target value of the 1/2 beam angle of the medium angle light distribution is 60 degrees, whereas the actually measured value of the 1/2 beam angle is about 45 degrees.
  • the curvature radius R is 0.7 mm.
  • the medium-angle light distribution lens 55 is concentric with the exit opening 33 of the tip 62B of the reflection mirror 32 (that is, centered on the optical axis K) in the plane thereof.
  • a hole 57 having a reduced shape is provided in the medium angle light distribution lens 55.
  • the hole 57 has a circular shape.
  • the hole 57 serves as a vent to prevent heat accumulation inside the reflection mirror 32, and the light emitting unit 30 and the reflection The thermal load on the mirror material is reduced.
  • the hole 57 is provided in conjunction with the fact that the medium angle light distribution lens 55 is sufficiently separated from the light source 25, so that the thermal expansion of the medium angle light distribution lens 55 also affects the light distribution. It can be suppressed.
  • FIG. 18 is a diagram showing a result of simulating the relationship between the diameter ⁇ of the hole 57 of the medium angle light distribution lens 55 shown in FIG. 16 and the value of the 1/2 beam angle of the illumination unit 10. This value is obtained by measuring the illumination unit 10 in which the height Hf of the reflection mirror 32 is 11.9 mm and the target value of the half beam angle of the medium angle light distribution is 60 degrees. As shown in the figure, in the range where the diameter ⁇ of the hole 57 is equal to or smaller than a predetermined value Ta (15 mm in actual measurement), the actual measurement value of the 1/2 beam angle is the case where the diameter ⁇ is 0 mm (that is, the hole The value is almost the same as that of 57).
  • the light distribution control of the medium angle light distribution lens 55 is mainly performed by the unevenness of the wave surface 59, and the influence of the hole 57 on the light distribution is It is small.
  • the diameter ⁇ of the hole 57 is larger than the predetermined value Ta, the actually measured value of the 1 ⁇ 2 beam angle suddenly increases and exceeds the target value of 60 degrees.
  • the diameter ⁇ of the hole 57 is equal to or greater than the predetermined value Ta, the light distribution control by the unevenness of the wavefront 59 is hindered by the light passing through the hole 57, that is, the medium angle light distribution is not maintained. It shows that the light distribution control by the hole 57 is more dominant than the unevenness of the wave surface 59.
  • the diameter ⁇ of the hole 57 is the limit at which the medium-angle light distribution is maintained by the light distribution control by the wave front 59. It is best to set the predetermined value Ta, that is, the predetermined value Ta.
  • the predetermined value Ta is a value that changes according to at least the height Hf of the reflecting surface 62 of the reflecting mirror 32 and the 1/2 beam angle that is the target of light distribution.
  • the predetermined value Ta can also be influenced by the size of the light emitting surface 30A of the light emitting unit 30.
  • the diameter ⁇ of the hole 57 can be qualitatively reduced to a value such that the angle ⁇ 3 is close to the target 1 ⁇ 2 beam angle.
  • the target value of the 1/2 beam angle is 60 degrees, whereas the angle ⁇ 3 is 51.9 degrees.
  • it is set to 15 mm based on the result shown in FIG. Thereby, the illumination unit 10 having a medium-angle light distribution as shown in the light distribution diagram of FIG. 19 is obtained.
  • FIG. 20 is a perspective view of the illumination unit 10 for medium angle light distribution
  • FIG. 21 is an exploded view of the illumination unit 10 for medium angle light distribution
  • FIG. 22 is a perspective view of the middle-angle light distribution lens unit 65.
  • illustration of the packing 27 is abbreviate
  • the illumination unit 10 for medium angle light distribution includes a lens unit 65 for medium angle light distribution that is changed to a medium angle light distribution.
  • the medium-angle light distribution lens unit 65 is a unit that integrally includes a plurality (three in the illustrated example) of medium-angle light distribution lenses 55.
  • a connecting portion 66 connecting between the lenses 55 for use and a plurality of claw portions 67 are provided.
  • a plurality of engagement holes 69 are provided in the surface of the reflection cover 26. The claw portion 67 of the medium angle light distribution lens unit 65 is inserted into and engaged with these engagement holes 69, whereby the medium angle light distribution lens unit 65 is mounted on the reflection cover 26 (so-called snap-in structure). .
  • the middle-angle light distribution lens 55 When the middle-angle light distribution lens unit 65 is attached, the middle-angle light distribution lens 55 is disposed so as to cover the emission opening 33 of the reflection mirror 32.
  • a screw 68 is passed through the connecting portion 66 of the middle-angle light distribution lens unit 65 and fastened to the housing 20 together with the reflective cover 26.
  • the light distribution of the illumination unit 10 with wide-angle light distribution can be changed to a medium angle simply by attaching the lens unit 65 for medium-angle light distribution to the reflection cover 26. Further, since the medium angle light distribution lens unit 65 is integrally provided with a plurality of medium angle light distribution lenses 55, these medium angle light distribution lenses 55 can be mounted at a time.
  • the number of the medium angle light distribution lenses 55 provided integrally in the medium angle light distribution lens unit 65 is arbitrary. Further, by changing the number of medium-angle light distribution lens units 65 to be mounted on the illumination unit 10, more precisely, the number of medium-angle light distribution lenses 55, the light distribution of the illumination unit 10 can be changed to a wide angle and a medium angle. It is also possible to change the light distribution between.
  • the following effects are obtained.
  • the emitted light emitted from the reflection mirror 32 can be easily changed to the medium angle light distribution. it can. Further, since the reflection mirror 32 can be used in common for the wide-angle light distribution and the medium-angle light distribution, the cost can be reduced.
  • the reflection mirror 32 distributes light at a wide angle, even when the light emitting surface 30A as the light emitting portion of the light source 25 is large, the reflection mirror 32 distributes light at a medium angle as compared with the configuration in which the reflection mirror 32 distributes light at an intermediate angle. The height Hf is suppressed. Thereby, when using the same housing
  • the reflection mirror 32 has a height Hf from the light emitting surface 30 ⁇ / b> A of the light source 25 to the emission opening 33 that has a wide-angle light distribution centering around the optical axis K in the emitted light of the light emitting surface 30 ⁇ / b> A. It was set as the height which radiate
  • the reflection mirror 32 is configured to press the light source substrate 29 of the light source 25 provided with the light emitting unit 30, a member for pressing the light source 25 against the housing 20 can be reduced.
  • the light incident from the exit aperture 33 of the reflection mirror 32 is refracted in the direction approaching the optical axis K and is distributed to the middle angle.
  • the lens 55 is configured to be used as a transmissive optical element. Therefore, since the thickness is suppressed as compared with a general condenser lens such as a convex lens, for example, a gap provided between the globe 21 and the reflection mirror 32 for arranging the medium angle light distribution lens 55 can be reduced. By reducing the gap, light leakage when the medium-angle light distribution lens 55 is not attached can be suppressed.
  • the lowest point 60S of the concave / convex concave portion 60 and the apex 61T of the convex portion 61 of the middle-angle light distribution lens 55 are curved surfaces having a predetermined curvature radius R.
  • the optical system efficiency light extraction efficiency
  • the light distribution shape in the luminosity diagram can be smoothed as compared with the case where the curved surface shape is not used.
  • the medium-angle light distribution lens 55 is configured to have the hole portion 57 that opens around the optical axis K. As a result, light in the vicinity of the optical axis K out of the light emitted from the reflection mirror 32 can be emitted without loss, and a reduction in optical system efficiency can be prevented.
  • the hole 57 serves as a vent to prevent heat from being accumulated inside the reflection mirror 32. The heat load on the material is reduced.
  • the hole 57 is provided in conjunction with the fact that the medium angle light distribution lens 55 is sufficiently separated from the light source 25, so that the thermal expansion of the medium angle light distribution lens 55 also affects the light distribution. It can be suppressed.
  • the light emitting unit 30 is a planar light source, the height Hf of the reflecting mirror 32 is suppressed, and the housing 20 can be miniaturized and the output can be increased.
  • the light source 25 may be a COB type LED that is an example of a planar light source.
  • a light source 25 having a planar light emitting surface using a light emitting element such as an organic EL may be used.
  • the light source 25 is not limited to a planar light source. At this time, as the light emitting portion of the light source 25 is larger than the point light source, the reflecting mirror 32 and the housing 20 can be made more compact.
  • the middle-angle light distribution lens 55 is illustrated as the transmission optical element that distributes the light emitted from the reflection mirror 32 to the middle angle, but the present invention is not limited thereto.
  • a condensing lens such as a Fresnel lens or a convex lens can be used as the transmissive optical element.
  • a transmissive optical element may be integrally formed on the globe 21.
  • a material that can be easily molded such as a resin material or a glass material, can be suitably used.
  • the globe 21 may be provided with a transmission optical element by bonding the globe 21 and the transmission optical element individually molded from the same or different materials.
  • 90 degrees and 60 degrees are exemplified as the target values of the 1/2 beam angle of the wide angle and middle angle light distribution of the illumination unit 10, it is not limited to this angle. That is, according to the purpose of use of the illumination unit 10, the irradiation target, and the like, the target values of the 1 ⁇ 2 beam angle of the wide-angle and medium-angle light distribution are also determined as appropriate.
  • the usage of the light source unit 70 and the lighting unit 10 is not limited to high ceiling lighting, but can be used for normal ceiling height ceiling lighting and other indoor lighting applications. In addition, it can be used for any application where there is a need to change the light distribution, such as floodlighting or street lighting. Furthermore, it can be used for both indoor and outdoor lighting.
  • Lighting unit (lighting fixture) DESCRIPTION OF SYMBOLS 11 Light emission part 20 Case 21 Globe 22 Main body part 25 Light source 26 Reflective cover 29 Circuit board 30 Light emission part 30A Light emission surface 32 Reflection mirror 33 Output opening 55 Medium angle light distribution lens (transmission type optical element) 56 Element Main Body 57 Hole 58 Surface 59 Wavefront 60 Concave 60S Bottom Point 61 Convex 61T Vertex 62 Reflecting Surface 62A Bottom End 65 Medium Angle Light Distribution Lens Unit 70 Light Source Unit K Optical Axis R Curvature Radius

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
PCT/JP2016/066132 2015-06-04 2016-06-01 光源ユニット、及び照明器具 WO2016194930A1 (ja)

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JP7519788B2 (ja) * 2020-03-11 2024-07-22 三菱電機株式会社 照明装置
EP4600545A1 (de) * 2024-02-12 2025-08-13 Ledvance GmbH Leuchtvorrichtung

Citations (8)

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Publication number Priority date Publication date Assignee Title
JP2010073627A (ja) * 2008-09-22 2010-04-02 Toshiba Lighting & Technology Corp 照明装置および照明器具
JP2011070816A (ja) * 2009-09-24 2011-04-07 Panasonic Electric Works Co Ltd 照明器具
JP2012084425A (ja) * 2010-10-13 2012-04-26 Enplas Corp 照明装置
JP2012113837A (ja) * 2010-11-19 2012-06-14 Toshiba Lighting & Technology Corp 照明装置
JP2013084574A (ja) * 2011-10-11 2013-05-09 Posco Led Co Ltd 光半導体照明装置
JP2014135172A (ja) * 2013-01-09 2014-07-24 Hitachi Appliances Inc 照明装置
JP2015015109A (ja) * 2013-07-03 2015-01-22 株式会社小糸製作所 照明装置
JP2015088389A (ja) * 2013-10-31 2015-05-07 パナソニックＩｐマネジメント株式会社 照明装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014123479A (ja) * 2012-12-21 2014-07-03 Hitachi Appliances Inc 照明装置及びこれに用いられる集光ユニット

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010073627A (ja) * 2008-09-22 2010-04-02 Toshiba Lighting & Technology Corp 照明装置および照明器具
JP2011070816A (ja) * 2009-09-24 2011-04-07 Panasonic Electric Works Co Ltd 照明器具
JP2012084425A (ja) * 2010-10-13 2012-04-26 Enplas Corp 照明装置
JP2012113837A (ja) * 2010-11-19 2012-06-14 Toshiba Lighting & Technology Corp 照明装置
JP2013084574A (ja) * 2011-10-11 2013-05-09 Posco Led Co Ltd 光半導体照明装置
JP2014135172A (ja) * 2013-01-09 2014-07-24 Hitachi Appliances Inc 照明装置
JP2015015109A (ja) * 2013-07-03 2015-01-22 株式会社小糸製作所 照明装置
JP2015088389A (ja) * 2013-10-31 2015-05-07 パナソニックＩｐマネジメント株式会社 照明装置

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