JP6390526B2 - Light source unit and lighting apparatus - Google Patents

Description

  The present invention relates to a light source unit capable of changing light distribution and a lighting fixture.

2. Description of the Related Art Conventionally, lighting fixtures that can obtain a desired light distribution such as a wide angle and a medium angle are known (see, for example, Patent Documents 1 to 3).
As a technique for obtaining a desired light distribution, 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. In 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.

JP 7-45113 A JP 2007-95647 A JP 2010-73627 A

However, in any of the conventional methods, an appropriate configuration that can change the light distribution pattern has not been considered when the light emitting portion of the light source is large.
This invention is made | formed in view of the situation mentioned above, and aims at providing the light source unit which can change a light distribution pattern, and a lighting fixture.

In order to achieve the above object, 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. comprising a transmission optical element for light distribution in the middle square of the outgoing light emitted from the emission opening of the mirror, the front Symbol reflection mirror is configured to light distribution of the light by both diffuse reflection, and specular reflection, the Of the radiated light of the light emitting part, it is a height at which light having a light beam of a wide angle distribution or a range corresponding to more than the 1/2 beam angle is directly emitted from the optical axis. A light source unit is provided.

  Moreover, 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.

  Further, in the light source unit according to the present invention, 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.

  In the light source unit according to the present invention, the transmissive optical element has a curved surface shape having a predetermined curvature radius at a lowest point of the concave and convex portions and a vertex of the convex portion.

According to the present invention, in the light source unit, the transmissive optical element is provided with a hole that opens in a shape similar to the opening of the reflection mirror around the optical axis and allows the direct light to pass therethrough. To do.

  According to another aspect of the present invention, there is provided a lighting apparatus comprising: the light source unit according to any one of the above; a housing in which the light source unit is incorporated; and a globe provided in the housing.

The present invention further includes: the light source unit according to any one of the above; a housing that houses the light source unit; and a globe that is provided in the housing, wherein the transmission optical element includes the light emission of the globe . Provided is a luminaire characterized by being provided on a surface on the part side .
Moreover, the present invention provides the light source unit according to any one of the above, wherein a concave portion and a convex portion are formed on the surface of the transmissive optical element, and the convex portion has inclined surfaces on both sides of the apex thereof. The inclined surface closer to the optical axis as viewed from the vertex refracts the reflected light component reflected by the reflecting mirror in a direction closer to the optical axis direction than the incident direction, while from the vertex the inclined surface on the far side from the optical axis as viewed in the direct light component of the light-you characterized in that refracted in a direction approaching the direction of the optical axis than the incident direction.

According to the present invention, 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.

It is a perspective view showing the whole high ceiling lighting fixture composition concerning an embodiment of the present invention. It is a figure which shows the structure of a high ceiling lighting fixture, (A) is a top view, (B) is a side view, (C) is a bottom view. It is a figure which shows the structure of the lighting fixture main body of a state except a top plate, (A) is a top view, (B) is a side view, (C) is a bottom view. It is a figure which shows the structure of a ring, (A) is a top view, (B) is AA sectional drawing of (A), (C) is an enlarged view of the site | part shown by the arrow B of (B). It is an assembly drawing of a high ceiling lighting fixture. It is a perspective view which shows the structure of an illumination unit. It is a top view of a lighting unit. It is CC sectional drawing of FIG. It is a disassembled perspective view of an illumination unit. It is a figure which shows the method of changing the light distribution of an illumination unit. It is a figure which shows the structure of an illumination unit typically. It is a light ray diagram of a light source unit. It is a light distribution diagram which shows the simulation result of the wide angle light distribution of an illumination unit. It is a figure which shows typically the structure of the illumination unit which provided the lens for medium angle light distribution in the reflective mirror. It is an expanded sectional view of the lens for middle angle light distribution. It is explanatory drawing of curved surface formation of the lens surface unevenness | corrugation for middle angle light distribution. It is a figure which shows the relationship between the vertex radius of the lens for middle angle light distribution, and the curvature radius R of the lowest point, and the measured value of the 1/2 beam angle of an illumination unit. It is a figure which shows the relationship between the diameter (PHI) of the hole of the lens for medium angle light distribution, and the measured value of the 1/2 beam angle of an illumination unit. It is a light distribution diagram which shows the simulation result of the medium angle light distribution of an illumination unit. It is a perspective view of the illumination unit for medium angle light distribution. It is an exploded view of the illumination unit for medium angle light distribution. It is a perspective view of the lens unit for middle angle light distribution.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, a high ceiling lighting fixture will be described as an example of a lighting fixture according to the present invention. Ceiling light fixtures are devices that are installed suspended from the ceiling surface of a building to illuminate the interior of a room, and high ceiling light fixtures are used in factories or other places where the ceiling height in the room is larger than general living rooms such as dwelling units and offices. 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, and FIG. 2C is a bottom view.
As shown in FIG. 1, 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. In this luminaire body 2, a light emitting element is used as a light source of the lighting unit 10, and 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. In addition to these electric circuits, various electric circuits can be housed in the electric circuit box 3.
In the high ceiling lighting device 1, 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.
In the high ceiling lighting device 1, 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 component that fixes the luminaire main body 2 to the ceiling surface of the building, and is fixed to the top plate 12 of the luminaire main 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, and FIG. 3 (C) is a bottom view. is there.
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.
Specifically, in all the illumination units 10, 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. 3A to 3C, all the lighting units 10 are connected to each other by a connecting tool 16 disposed in the center of the arrangement of the lighting 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.

Moreover, 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. In the bottom view of the high ceiling lighting fixture 1, as shown in FIG. 2C, 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.
Furthermore, as shown in FIG. 2B and FIG. 3B, 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. Therefore, the heat of the lighting unit 10 can be sufficiently radiated to the outside through the exposed portion.

4A and 4B 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 | part shown by the arrow B of 4 (B).
As shown in FIG. 4A, 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.
As shown in this figure, 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. .
As described above, 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. As a result, even if a part of the lighting unit 10 has a decrease in the supporting force with the top plate 12, the reduction in the supporting force is compensated by the supporting force of the other lighting units 10. 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.
As shown in FIG. 6, 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. As shown in FIGS. 8 and 9, the main body 22 includes a light source 25 of the illumination unit 10. And 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.
As shown in FIG. 9, 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. As the material of the globe 21, a glass material or a transparent resin material that can obtain a high waterproof property relatively easily is used.

As shown in FIG. 9, 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. 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.
As shown in FIG. 8, 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. Thereby, the interference of heat between the light sources 25 is suppressed, and the heat of the light sources 25 is efficiently transmitted to the fin portions 47 that are thermally coupled to the bottom surface 23.
As shown in FIG. 9, 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. Unlike the main body portion 22 made of aluminum die casting, the radiating fin unit 40 is formed of a thin plate material having high thermal conductivity. Specifically, as shown in FIG. 9, 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.
By providing the heat radiating fin unit 40 separately from the main body 22, the casing 20 can be significantly reduced in weight compared to the case where the heat radiating fin unit 40 is integrally formed with the main body 22 by aluminum die casting.

  As shown in FIG. 9, 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.

In addition, a large number of 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.
By providing the fin portion 47 around the radiating fin unit 40, the radiating fin unit 40 is guarded by the fin portion 47.

  By the way, the illumination unit 10 is configured so 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 | casing 20 in common, the size of the housing | casing 20 needs to be made into the size matched with the reflective mirror 32 for medium angle light distribution with high height Hm. Therefore, the housing 20 becomes large and expensive. In addition, a dedicated reflecting mirror 32 is required for each of the wide-angle and medium-angle light distributions, which increases costs.
Moreover, since the housing | 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 | tip 32A of the reflective mirror 32 to the globe 21 becomes large more than necessary. For this reason, light leaking into the housing 20 from between the tip 32A of the reflecting mirror 32 and the globe 21 increases, loss on the inner surface of the housing 20 increases, and light extraction efficiency by the optical system deteriorates.
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.

In the method (B), 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 is a technique for obtaining light distribution at the corners.
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.

In the method (C), 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.
However, when the light source 25 is a COB type or SMD (Surface Mount Device) type LED, it has a Lambert light distribution (cosine light distribution) and has a wide-angle emission component having a large angle with the optical axis K (that is, in the lateral direction). (Radiated light) becomes stray light, and the loss on the inner surface of the housing 20 increases, so that the light extraction efficiency by the optical system is deteriorated, and light distribution control is also difficult.
In addition to this, if 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.

In both the method (D) and the method (E), when the reflection mirror 32 that makes the emitted light a wide-angle light distribution is built in the housing 20 and the light distribution is changed to a medium-angle light distribution, This is a technique of adding a transmissive optical element that emits emitted light at a medium angle distribution to an optical system.
The difference between the method (D) and the method (E) is that, in the method (D), the lens portion 54 that is a transmissive optical element is provided integrally with the globe 21, whereas in the method (E), the intermediate angle that is a transmissive optical element. The light distribution lens 55 is provided separately from the globe 21.
According to these methods (D) and (E), 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.
In addition, since the reflecting mirror 32 is for wide-angle light distribution, if the transmissive optical element is thin, the height Hm can be suppressed compared to the methods (A) to (C), and the housing The body 20 can be reduced in size and cost.
Further, since 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.
Moreover, even if it is a case where the material of the glove | globe 21 is made into a glass material in order to improve the waterproofness of the opening of the housing | casing 20 by employ | adopting the method (E), the flat glass which can be manufactured comparatively cheaply Can be used for the glove 21, so that the cost can be reduced.

As described above, 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 housing 20.
In the lighting unit 10, among these methods (D) and (E), the method (E) that can use flat glass for the globe 21 is employed in order to provide the casing 20 with waterproofness.
Hereinafter, 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.
As shown in the figure, 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. As 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.
However, since 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. An example of 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. In addition to the resin material, a reflective silicon material (for example, Toray Dow Corning Co., Ltd., optical reflective silicon material: MS-2002) can also be used.

  Note that portions other than the reflection mirror 32 of the reflection cover 26 do not come into contact with the light source substrate 29, and therefore it is not necessary to have heat resistance as high 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. As 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 θ1 with the optical axis K as the center out of the radiated light of the light source 25 is directly emitted. Is set. Further, the remaining component of the radiated light from the light source 25 is incident on the reflecting surface 62 inclined at an inclination θ 2 with respect to the optical axis K, reflected, and emitted from the emission opening 33. As shown in FIG. 12, the inclination θ2 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. .

Here, in the light source unit 70, the angle θ <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 ½ beam angle of wide-angle light distribution or more than the target value of ½ 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 θ2 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. .
In the light source unit 70 of the present embodiment, the target value of the 1/2 beam angle is 90 degrees, and the angle θ1 is 95.7 degrees. The angle θ1 can be suitably set to a value up to about the target value of +1/2 beam angle +20 degrees.

However, if most of 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.
Therefore, in the light source unit 70, 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. .
As a result, as shown in the light distribution diagram obtained by actually measuring the light distribution of the illumination unit 10 in FIG. 13, 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.
Note that 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.

  Further, in the illumination unit 10, the reflection cover 26 integrally provided with the reflection mirror 32 covers substantially the entire exit opening of the light exit portion 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. Thereby, the return light reflected at the time of entering the globe 21 from the light source unit 70 is re-reflected by the reflection cover 26 and emitted from the globe 21, so that the light extraction efficiency is further improved.

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 main body portion 56 formed of a light-transmitting resin material. Of both surfaces of the element main body portion 56, a 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. Specifically, 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. On the other hand, 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. As a result, 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.

Here, in the medium-angle light distribution lens 55, the apex 61T of the convex portion 61 and the lowest point 60S of the concave portion 60 are formed in a curved surface shape instead of an acute cross-sectional shape.
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. Then, 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.
As shown in the figure, in the middle-angle light distribution lens 55, as the radius of curvature R of the apex 61T and the lowest point 60S increases, the value of the 1/2 beam angle increases, and the optical system efficiency (light The extraction efficiency is also increased. In addition to this, it has been found through experiments that the light distribution shape in the luminosity diagram becomes smoother as the radius of curvature R increases.
Therefore, 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. Enhanced.
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.

By the way, although the effect of improving the optical system efficiency is obtained by the curvature radius R, the 1/2 beam angle is also increased. Therefore, in a state before the curvature radius R is provided in the concave portion 60 and the convex portion 61, the wavefront 59 is set so that the value of the ½ beam angle is smaller than the target value of the ½ beam angle of the medium angle light distribution. The dimensions of the concave portion 60 and the convex portion 61 are set.
In the medium-angle light distribution lens 55 shown in FIG. 16, the plate thickness Pa is 2.5 mm, and 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 Φ of the hole 57 described later is 15 mm. In addition, 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.

  Further, as shown in FIG. 14, 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 (so-called similar shape) is provided. In the medium angle light distribution lens 55, the hole 57 has a circular shape. By providing the hole 57 in the medium-angle light distribution lens 55, light in the vicinity of the optical axis K (light in the range of the angle θ3 in the illustrated example) out of the light emitted from the reflection mirror 32 is emitted without loss. be able to. Thereby, even when the medium-angle light distribution lens 55 is provided, it is possible to suppress a decrease in the optical system efficiency. In addition, even when the opening of the reflection mirror 32 is covered with the medium-angle light distribution lens 55, 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. In addition, 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 Φ 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 Φ 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 Φ is 0 mm (that is, the hole The value is almost the same as that of 57). This is because, in the range where the diameter Φ of the hole 57 is equal to or smaller than the predetermined value Ta, 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.

On the other hand, when the diameter Φ of the hole 57 is larger than the predetermined value Ta, the actually measured value of the ½ beam angle suddenly increases and exceeds the target value of 60 degrees. This means that when the diameter Φ of the hole portion 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 portion 57 and the medium angle light distribution is not maintained. This indicates that the light distribution control by the hole 57 is more dominant than the unevenness of the wavefront 59.
Since the optical system efficiency (light extraction efficiency) increases as the diameter Φ of the hole 57 increases, the diameter Φ 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.

Note that the tendency associated with the change in the diameter Φ of the hole 57 is the case where the reflection surface 62 of the reflection mirror 32 built in the illumination unit 10 is a regular reflection surface that includes a specular reflection component in the reflected light. This can be seen in any of the cases where 62 is a diffuse reflection surface containing a large amount of diffuse reflection components.
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.
In the illumination unit 10, the diameter Φ of the hole 57 can be qualitatively reduced to a value such that the angle θ3 is close to the target ½ beam angle. (In this embodiment, the target value of the 1/2 beam angle is 60 degrees, whereas the angle θ3 is 51.9 degrees). In this embodiment, 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.

  20 is a perspective view of the illumination unit 10 for medium angle light distribution, and 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. In addition, illustration of the packing 27 is abbreviate | omitted in FIG.

As shown in FIGS. 20 and 21, 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. As shown in FIGS. A connecting portion 66 connecting between the lenses 55 for use and a plurality of claw portions 67 are provided.
As shown in FIG. 21, a plurality of engagement holes 69 are provided in the surface of the reflection cover 26, and the claw portions 67 of the middle-angle light distribution lens unit 65 are inserted into these engagement holes 69 to engage with each other. As a result, the medium angle light distribution lens unit 65 is mounted on the reflection cover 26 (so-called snap-in structure). 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.

According to the illumination unit 10 for medium-angle light distribution, 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.

  It should be noted that 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.

As described above, according to the present embodiment, the following effects are obtained.
According to the illumination unit 10 and the light source unit of the present embodiment, by providing the reflection mirror 32 with the medium angle light distribution lens 55, 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.
In addition, since 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 | casing 20 by wide angle light distribution and medium angle light distribution, size reduction and cost reduction of the housing | casing 20 are attained.

Further, according to the present embodiment, 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 | emits the light of the range equivalent to the target value of a 1/2 beam angle with direct light.
Thereby, since the 1/2 beam angle of wide-angle light distribution is made by direct light, the opening of the main beam of the illumination unit 10 can be made relatively easily by this direct light.
In addition, by limiting the height Hf of the reflection mirror 32 to the height at which the direct light is emitted, the main beam of the illumination unit 10 can be accurately opened while suppressing the height Hf of the reflection mirror 32. be able to.

  Further, according to the present embodiment, since 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, members for pressing the light source 25 against the housing 20 can be reduced.

Further, according to the present embodiment, 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.
Thereby, 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.

Further, according to the present embodiment, 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.
As a result, the optical system efficiency (light extraction efficiency) can be increased and the light distribution shape in the luminosity diagram can be smoothed as compared with the case where the curved surface shape is not used.

Further, according to the present embodiment, 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. In addition to this, even when the opening of the reflection mirror 32 is covered with the medium-angle light distribution lens 55, 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. In addition, 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.

  In addition, according to the present embodiment, since the light emitting unit 30 is a planar light source, the height Hf of the reflection mirror 32 is suppressed, and the housing 20 can be miniaturized and the output can be increased.

  The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the gist of the present invention.

For example, in the above-described embodiment, the light source 25 may be a COB type LED that is an example of a planar light source. Further, instead of the COB-type LED, 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.

  In addition, for example, the medium-angle light distribution lens 55 is illustrated as the transmission optical element that distributes the light emitted from the reflection mirror 32 to the medium angle, but the present invention is not limited thereto. For example, a condensing lens such as a Fresnel lens or a convex lens can be used as the transmissive optical element.

Further, as shown in the method (D) of FIG. 10, a transmissive optical element may be integrally formed on the globe 21. As the material for the globe 21 and the transmissive optical element, 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.

  Moreover, although 90 degree | times and 60 degree | times were illustrated as a target value of the 1/2 beam angle of the wide angle of the illumination unit 10, and a medium angle light distribution, 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 ½ 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.

10 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

Claims (8)

A light emitting unit;
A reflective mirror that surrounds the light emitting part and distributes the light of the light emitting part at a wide angle;
A transmission-type optical element that is selectively provided on the reflection mirror and distributes the emitted light emitted from the emission opening of the reflection mirror to a middle angle; and
Before Symbol reflection mirror,
While distributing the light by both diffuse reflection and regular reflection,
Of the radiated light of the light emitting unit, the height is such that light having a light beam with a wide angle distribution around the optical axis or light in a range corresponding to the 1/2 beam angle or more is directly emitted by light. A light source unit characterized by that. The light source unit according to claim 1, wherein the reflection mirror presses a substrate on which the light emitting unit is provided. The transmissive optical element is
  Comprising an element body provided in the exit aperture of the reflecting mirror;
  On the surface of the element body portion, there is formed an unevenness that refracts light incident from the exit aperture in a direction approaching the optical axis and distributes the light to the middle angle.
  The light source unit according to claim 1 or 2, wherein The transmissive optical element is
  The light source unit according to claim 3, wherein the lowest point of the concave and convex portions of the concave and convex portions and the apex of the convex portion are curved surfaces having a predetermined radius of curvature.   The transmissive optical element is
  A hole is formed in the shape similar to the opening of the reflection mirror with the optical axis as a center and allows the direct light to pass through.
  The light source unit according to claim 3, wherein the light source unit is a light source unit. A light source unit according to any one of claims 1 to 5,
  A housing containing the light source unit;
  A glove provided in the housing;
  A lighting fixture comprising: The light source unit according to claim 1 or 2,
  A housing containing the light source unit;
  A glove provided in the housing,
  The transmissive optical element is provided on a surface of the globe on the light emitting unit side.
  A lighting apparatus characterized by that.   In the light source unit in any one of Claims 1-5,
  A concave portion and a convex portion are formed on the surface of the transmissive optical element,
  The convex portion has inclined surfaces on both sides of the apex,
  The inclined surface closer to the optical axis as viewed from the vertex refracts the reflected light component reflected by the reflecting mirror in a direction closer to the optical axis direction than the incident direction, while the light as viewed from the vertex. The inclined surface far from the axis refracts the direct light component of the light emitting unit in a direction closer to the optical axis direction than the incident direction.
  A light source unit characterized by that.

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