JP2020161245A - Reflector and lighting device - Google Patents

Abstract

To provide a reflector uniformizing the brightness of an irradiated face.SOLUTION: A reflector 22 includes a first reflection body 33, and a second reflection body 34. The first reflection body 33 has a parabolic reflection surface 35 disposed on one side with the optical axis z of the light-emitting element 30 as a center. The second reflection body 34 includes a dispersion reflection surface 37 disposed on another side with the optical axis z of the light-emitting element 30 as a center, and has a projecting height in an optical axis direction higher than that of the first reflection body 33.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a reflecting device that controls light distribution and a lighting device using this reflecting device.

Conventionally, there are lighting devices such as a horizont light that illuminates the wall surface that is the background of a television studio or a stage.

This lighting device is installed on the floor side or the ceiling side with respect to the wall surface to be irradiated, so that the light extends upward from the floor side or downward from the ceiling side in order to illuminate the wall surface with uniform brightness. Light distribution control is performed in.

In this way, the light distribution control is performed so that the wall surface has uniform brightness, but the area near the installation position of the lighting device is bright and the area far away is dark, resulting in uneven brightness of the wall surface. Since it is easy, it is desired that the brightness of the wall surface can be made uniform.

Japanese Unexamined Patent Publication No. 2015-2157

The present invention is to provide a reflecting device and a lighting device capable of making the brightness of an irradiated surface uniform.

The reflector of the embodiment includes a first reflector and a second reflector. The first reflector has a parabolic reflecting surface arranged on one side about the optical axis of the light emitting element. The second reflector has a diffuse reflection surface arranged on the other side of the optical axis of the light emitting element, and has a higher protrusion height in the optical axis direction than the first reflector.

According to the reflecting device of the embodiment, it can be expected that the brightness of the irradiated surface becomes uniform.

It is sectional drawing of the reflector which shows 1st Embodiment. It is a perspective view of the same-mentioned reflector. It is a perspective view of the 1st reflector of the same-mentioned reflector. It is a side view of the lighting device using the same-mentioned reflection device. It is the schematic of the use state of the lighting apparatus as above. It is a schematic diagram explaining the structure of the 1st reflector of the reflector which shows 2nd Embodiment. It is sectional drawing of the reflector which shows the 3rd Embodiment. It is sectional drawing of the reflector which shows the 4th Embodiment.

Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 5.

As shown in FIG. 5, for example, in a television studio or a stage, a lighting device 11 which is a horizontal light for illuminating a wall surface (horizont surface) 10 which is an irradiated surface as a background is installed. The lighting device 11 includes a lighting device 11a which is a lower horizont light installed along the wall surface 10 on the floor surface side, and an upper horizont light which is a baton or the like suspended along the wall surface 10 on the ceiling side. Equipment 11b and the like are included.

FIG. 4 shows a lighting device 11a which is a lower horizont light. The lighting device 11a (hereinafter, lighting device 11) includes a light source unit 15, a power supply unit 16 that supplies power to the light source unit 15, and a support unit that supports the light source unit 15 with respect to the power supply unit 16 so that the angle of the light source unit 15 can be adjusted. It has 17. The light source unit 15 is installed in an inclined posture with a predetermined angle upward so that the surface that emits light faces the wall surface 10 diagonally upward. The lighting device 11 sets the direction of the wall surface 10 as the light irradiation direction A.

The light source unit 15 includes a housing 20, a light emitting module 21 housed in the housing 20, and a reflecting device 22.

The housing 20 includes a case 25 having an open upper surface on one side, and a translucent member 26 arranged so as to cover the opening of the case 25. The case 25 is formed horizontally in the width direction along the wall surface 10, and the upper surface (opening of the housing 20) is inclined downward toward the light irradiation direction A, which is the direction of the wall surface 10. The light-transmitting member 26 is made of, for example, a transparent glass plate or resin plate that transmits light. The opening of the housing 20 is inclined toward the light irradiation direction A, but since the support portion 17 having an adjustable angle is provided, the opening of the housing 20 is inclined in parallel with the bottom plate of the housing 20. It does not matter if there is no structure.

Further, as shown in FIG. 1, the light emitting module 21 includes a substrate 29 and a light emitting element 30 mounted on the substrate 29. The substrate 29 is formed horizontally along the width direction of the housing 20, and a plurality of light emitting elements 30 are mounted on one surface at predetermined intervals. The light emitting element 30 is a semiconductor light emitting element such as an LED or an organic EL. As the light emitting element 30, for example, a multicolored light emitting color element including red, green, blue, white, cyan, and the like is used. The substrate 29 is thermally connected to the case 25, and the heat generated by the light emitting element 30 is dissipated into the air through the case 25. The optical axis z extending vertically from the center of the light emitting surface of the light emitting element 30 is inclined in the light irradiation direction A with respect to the vertical direction.

Further, as shown in FIGS. 1 to 3, the reflector 22 includes a first reflector 33 arranged on one side of the light irradiation direction A about the optical axis z of the light emitting element 30, and the light emitting element 30. It has a second reflector 34 arranged on the other side opposite to the light irradiation direction A about the optical axis z. The first reflector 33 and the second reflector 34 are separated from each other.

The first reflector 33 has a parabolic reflecting surface 35, which is a plurality of condensing reflecting surfaces individually provided for each light emitting element 30. A plurality of parabolic reflecting surfaces 35 are integrally arranged side by side along the width direction of the first reflecting body 33. Each parabolic reflection surface 35 is formed on a mirror surface having a specular reflection characteristic. Each parabolic reflecting surface 35 is a parabolic surface whose focal point is the light emitting surface of the light emitting element 30 or the vicinity of the front and rear of the light emitting surface on the optical axis z of the light emitting element 30, and is centered on the optical axis z of the light emitting element 30. It is formed in a three-dimensional shape that is approximately half of the rotating parabolic surface. A part of the ridgeline portion on the tip side of the adjacent parabolic reflecting surfaces 35 is cut out, and the tip sides of the adjacent parabolic reflecting surfaces 35 are communicated with each other.

The second reflector 34 has a reflecting surface 36 provided on a side surface facing the plurality of light emitting elements 30. The reflecting surface 36 is continuously and integrally formed in the width direction of the second reflecting body 34. The tip side of the second reflector 34 is provided with a protrusion height in the optical axis direction higher than that of the first reflector 33. That is, the tip side of the second reflector 34 protrudes in the optical axis direction from the position in the horizontal direction h from the tip side of the first reflector 33.

A diffuse reflection surface 37 that diffusely reflects light is provided at least on the tip end side of the reflection surface 36 of the second reflector 34 in the optical axis direction. The diffuse reflection surface 37 is, for example, textured. Further, the reflective surface 36 of the second reflector 34 is provided with a specular specular reflection surface 38 having a specular reflection characteristic on the side opposite to the diffuse reflection surface 37 in the optical axis direction. The specular reflection surface 38 may have a parabolic shape with the light emitting surface of the light emitting element 30 as the focal point. The boundary line b between the diffuse reflection surface 37 and the specular reflection surface 38 is, for example, a position in the horizontal direction h from the tip end side of the first reflector 33, but is lighter than the position in the horizontal direction h. It may be located in the direction opposite to the axial direction or the optical axis direction. The second reflector 34 preferably has a specular reflection surface 38 on the reflection surface 36, but the entire reflection surface 36 may be a diffuse reflection surface 37.

The light emitting element 30 and the reflecting device 22 may be arranged in a plurality of rows in the light irradiation direction A.

Further, the power supply unit 16 converts an external power source such as an AC power source into a predetermined lighting power source such as a DC power source and supplies it to the light emitting module 21.

Then, when the light emitting element 30 of the lighting device 11 emits light, the light directed in the optical axis direction from the light emitting element 30 is transmitted through the light transmitting member 26 and emitted as direct light in the light irradiation direction A, and the light emitting element 30 is the third. The light directed to the reflector 33 of 1 is reflected by the light-emitting reflecting surface 35, passes through the translucent member 26 as reflected light, and is emitted in the light irradiation direction A, and the light directed from the light emitting element 30 toward the second reflector 34. Is reflected by the reflecting surface 36, passes through the light transmitting member 26, and is emitted in the light irradiation direction A.

The light L1 reflected by the parabolic reflection surface 35 of the first reflector 33 is condensed and largely reflected in the direction parallel to the optical axis direction. Therefore, the light L1 reflected by the parabolic reflecting surface 35 of the first reflector 33 is irradiated to a height region far away from the installation height of the lighting device 11 on the wall surface 10, and the brightness in that region is ensured. Will be done.

Of the reflecting surfaces of the second reflector 34, the light L2 reflected by the normal reflecting surface 38 is reflected in a direction parallel to the optical axis direction, and the light reflected by the diffuse reflecting surface 37 is diffused.

The light L2 reflected by the specular reflection surface 38 of the second reflector 34 is also reflected in a large amount in the direction parallel to the optical axis direction. Therefore, the light L2 reflected by the specular reflection surface 38 of the second reflector 34 is irradiated to a height region farther than the installation height of the lighting device 11 on the wall surface 10, and the brightness in that region is more ensured. Will be done.

A part of the light L3 diffusely reflected by the diffuse reflection surface 37 of the second reflector 34 passes outside the tip of the first reflector 33 and is irradiated from the light transmitting member 26 in the light irradiation direction A. Is emitted to. This part of the light L3 is below the position in the horizontal direction h from the tip side of the first reflector 33, and is emitted to the opposite side of the projectile reflection surface 35 of the first reflector 33. Will be done. Therefore, the diffused light diffusely reflected by the diffuse reflection surface 37 of the second reflector 34 is irradiated to a height region close to the installation height of the lighting device 11 on the wall surface 10, and the brightness in that region is ensured. To.

Therefore, the illuminating device 11 reflects the direct light of the light emitting element 30 and the reflection reflected by the diffuse reflection surface 35 and the normal reflection surface 38 in the light irradiation direction A rather than the first reflector 33 in the light irradiation direction A. A large amount of light is emitted, and diffuse reflection light reflected by the diffuse reflection surface 37 is emitted in the light irradiation direction A rather than the first reflector 33. Therefore, the brightness of the wall surface 10 becomes uniform over a wide area.

The reflecting device 22 of the present embodiment configured in this way includes a first reflecting body 33 having a luminous reflecting surface 35 arranged on one side about the optical axis z of the light emitting element 30, and the light emitting element 30. It is configured by combining with a second reflector 34 which has a diffuse reflection surface 37 arranged on the other side with the optical axis z as the center and has a higher protrusion height in the optical axis direction than the first reflector 33. Therefore, the brightness of the irradiated surface can be made uniform.

Further, the second reflector 34 has a diffuse reflection surface 37 on the tip side in the optical axis direction, and a specular reflection surface 38 having a specular reflection characteristic on the side opposite to the diffuse reflection surface 37 in the optical axis direction. Therefore, the light extraction efficiency is increased, the light emitted to the wall surface 10 is increased, and the brightness of the irradiated surface can be improved.

In the lighting device 11 using the reflecting device 22, the parabolic reflecting surface 35 is arranged on one side of the light irradiation direction A about the optical axis z of the light emitting element 30, and the diffuse reflecting surface 37 is the optical axis of the light emitting element 30. Since it is arranged on the other side opposite to the light irradiation direction A with z as the center, the brightness of the wall surface 10 which is the irradiated surface in the light irradiation direction A can be made uniform.

Further, the direct light of the light emitting element 30 and the reflected light reflected by the light emitting reflecting surface 35 are emitted in the optical axis direction from the first reflector 33 toward the light irradiation direction A, and the first reflector 33 Since the diffuse reflection light reflected by the diffuse reflection surface 37 is emitted in the light irradiation direction A, the brightness of the wall surface 10 which is the irradiated surface in the light irradiation direction A can be made uniform.

Next, FIG. 6 shows a second embodiment. FIG. 6 shows a schematic view of the first reflector 33, and other configurations are omitted.

The plurality of projectile reflecting surfaces 35 of the first reflector 33 are arranged more curvedly in the width direction of the first reflector 33 than when they are arranged linearly in the width direction of the first reflector 33. As a result, the width of the first reflector 33 is reduced by the w dimension. Therefore, the number of parabolic reflecting surfaces 35 that can be arranged within the same width dimension can be increased, and the brightness can be improved. Alternatively, the widthwise dimension of the first reflector 33 can be reduced, and the widthwise dimension of the illuminating device 11 can be reduced.

Next, FIG. 7 shows a third embodiment.

The first reflector 33 and the second reflector 34 of the reflector 22 are set as one set, and a plurality of sets are arranged in a plurality of rows in the light irradiation direction A. In this case, the tip side of the first reflector 33 of the adjacent set and the tip side of the second reflector 34 are arranged so as to coincide with each other. Although FIG. 7 shows two rows of reflecting devices 22, a reflecting device 22 having three or more rows may be used.

Next, FIG. 8 shows a fourth embodiment.

An outer reflecting surface 41 is formed on a surface of the first reflector 33 opposite to the parabolic reflecting surface 35 and facing the light irradiation direction A, and a second light emitting element 42 that irradiates the outer reflecting surface 41 with light. Is used. The outer reflecting surface 41 may be a diffuse reflecting surface or a mirror surface having a specular reflection characteristic.

Then, both sides of the first reflector 33 can be used for reflection, and the brightness can be improved without increasing the size or complicating the structure.

The lighting device 11b, which is an upper horizont light, is also configured in the same manner as the lighting device 11a described above, and the same action and effect can be obtained.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

11 Lighting equipment
22 Reflector
30 light emitting element
33 First reflector
34 Second reflector
35 Parabolic reflective surface
37 Diffuse reflective surface
38 Specular reflection surface A Light irradiation direction z Optical axis

Claims (4)

With a first reflector having a parabolic reflecting surface arranged on one side about the optical axis of the light emitting element;
With a second reflector having a diffuse reflection surface arranged on the other side about the optical axis of the light emitting element and having a higher protrusion height in the optical axis direction than the first reflector;
A reflecting device characterized by comprising. The second reflector has the diffuse reflection surface on the tip side in the optical axis direction, and has a specular reflection surface having a specular reflection characteristic on the side opposite to the diffuse reflection surface in the optical axis direction. The reflector according to claim 1. With a light emitting element whose optical axis is tilted toward the light irradiation direction;
The parabolic reflection surface is arranged on one side of the light irradiation direction with the optical axis of the light emitting element as the center, and the diffuse reflection surface is on the other side opposite to the light irradiation direction with the optical axis of the light emitting element as the center. With the reflector according to claim 1 or 2 which is arranged;
A lighting device characterized by comprising. The direct light of the light emitting element and the reflected light reflected by the projectile reflection surface are emitted in the optical axis direction from the first reflector toward the light irradiation direction, and the reflected light is emitted from the first reflector. The lighting device according to claim 3, wherein diffuse reflected light reflected by the diffuse reflection surface is emitted in the light irradiation direction.

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