WO2017200163A1

WO2017200163A1 - Lighting device creating light wall

Info

Publication number: WO2017200163A1
Application number: PCT/KR2016/013792
Authority: WO
Inventors: In Tea KIM
Original assignee: Kim In Tea
Priority date: 2016-05-17
Filing date: 2016-11-28
Publication date: 2017-11-23

Abstract

A lighting device generating a light wall according to an embodiment of the present invention for dividing a space includes a light source emitting light, a lens converting the light emitted from the light source into parallel light, and a reflector reflecting the parallel light incident from the lens. The reflector is provided in a horn shape, a vertex of the reflector faces the light source, and the parallel light is incident on a side surface of the reflector.

Description

LIGHTING DEVICE CREATING LIGHT WALL

The present invention relates to a lighting device.

Lighting devices are installed in a specific space and provide necessary brightness to living spaces or workplaces. Recently, the lighting devices provide brightness to dark places, and moreover, are being much used for creating an atmosphere of a specific space by modifying installation places, intensity of light, a light irradiation direction, designs of devices, etc.

In specific spaces such as exhibition halls, cafes, offices, etc., walls or partitions are being much used for dividing a space. The walls or the partitions block contact between a space and a space, and thus, have an advantage where workers can work without being self-conscious about eyes of other persons. However, there are demerits in that an installation work is difficult and the installation cost is much expended. Also, once the walls or the partitions are installed, deformation is not easy, and for this reason, there is a limitation in using a space.

The present invention is for solving the above-described problems, and it is an object of the present invention to provide a lighting device for dividing a space.

To accomplish the above-described object, a lighting device according to an embodiment of the present invention includes a light source emitting light, a lens converting the light emitted from the light source into parallel light, and a reflector reflecting the parallel light incident from the lens. The reflector is provided in a horn shape, a vertex of the reflector faces the light source, and the parallel light is incident on a side surface of the reflector.

According to the present invention, since a space is divided by only installation of lighting, installation is easy, and the installation cost is low.

Moreover, according to the present invention, since a light wall can be removed by merely turning off lighting, a space can be efficiently used by turning on/off lighting depending on the case.

Moreover, according to the present invention, since a plurality of light walls can be generated by one lighting device and a thickness or an area of the light wall can be adjusted, the needs of consumers can be satisfied.

Moreover, according to the present invention, since it is easy to change an installation position of a lighting device, space modification is easy.

Moreover, according to the present invention, by using a light source of which a mothproof effect is expected, a mothproof wall may be generated.

FIG. 1 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a first embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating a lighting device according to a first embodiment of the present invention.

FIG. 3 is an X axis cross-sectional view illustrating a lighting area generated by a lighting device according to a first embodiment of the present invention.

FIG. 4 is a diagram illustrating a hexagonal pyramid-shaped reflector.

FIG. 5 is an X axis cross-sectional view illustrating a lighting area generated by a hexagonal pyramid-shaped reflector.

FIG. 6 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a second embodiment of the present invention.

FIG. 7 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a third embodiment of the present invention.

FIG. 8 is an X axis cross-sectional view for describing a light blocking area adjusted by a first light blocking plate.

FIG. 9 is a cross-sectional view illustrating a lighting area, generated by a lighting device according to a third embodiment of the present invention, seen in an X axis direction.

FIG. 10 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a fourth embodiment of the present invention.

FIG. 11 is a diagram for describing a thickness of a lighting area adjusted by a second light blocking plate.

FIG. 12 is a cross-sectional view illustrating a light path seen in a Z axis direction in a lighting device according to a fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view illustrating a light path seen in a Z axis direction in a lighting device according to a sixth embodiment of the present invention.

FIG. 14 is a diagram illustrating an example where only some of a plurality of lighting units emit light.

FIG. 15 is a diagram illustrating another example where only some of a plurality of lighting units emit light.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment

FIG. 1 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a first embodiment of the present invention, and FIG. 2 is a diagram schematically illustrating the lighting device according to the first embodiment of the present invention. Also, FIG. 3 is an X axis cross-sectional view illustrating a lighting area generated by the lighting device according to the first embodiment of the present invention.

Referring to FIGS. 1 and 2, a lighting device 100 according to an embodiment of the present invention includes a light source 120, a lens 140, and a reflector 130. In another embodiment, the lighting device 100 may further include an absorber 110.

First, the light source 120 is configured with a dot light source and radially irradiates light. In this case, an irradiation angle of the light source 120 may be greater than 10 degrees and less than 360 degrees. The light source 120 may be one of a light bulb, a flashtube, a halogen lamp, a fluorescent lamp, a carbon arc lamp, a mercury lamp, a fluorescent mercury lamp, a metal haloid lamp, a xenon lamp, a hydrogen discharge lamp, a cadmium lamp, a sodium lamp, a neon lamp, a krypton lamp, and a light emitting diode (LED).

In an embodiment, the light source 120 may emit light having a wavelength range which bugs dislike. Bugs have a characteristic of disliking light having a specific wavelength range, for example, light of 580nm to 700nm. The light source 120 emits the light having the wavelength range, thereby showing a mothproof effect. In this case, the present invention may generate a mothproof wall by using only lighting without dividing a space.

Next, the lens 140 converts the light, emitted from the light source 120, into parallel light. In more detail, the lens 140 is disposed apart from the light source 120. In this case, the light source 120 may be disposed in a focus of the lens 140. The lens 140 refracts the light incident from the light source 120 to generate parallel light.

If the lens 140 converts the light incident from the light source 120 into the parallel light, the kind of the lens 140 is not limited. The lens 140 may be an aspherical lens, or may be a spherical lens. Also, the lens 140 may be a convex lens, and in detail, may be one of a biconvex lens, a plane-convex lens, and a meniscus convex lens.

Next, the reflector 130 reflects the parallel light incident from the lens 140. The reflector 130 is provided in a horn shape. According to an embodiment, in a case of being provided in a horn shape, the reflector 130 may be disposed in order for a vertex to face the lens 140 and the light source 120. Therefore, as illustrated in FIG. 1, the parallel light generated through the conversion by the lens 140 may be incident on a side surface of the reflector 130.

FIGS. 1 to 3 illustrate the reflector 130 provided in a cone shape, but in another embodiment, the reflector 130 may be provided in a multi-angle horn shape. For example, as illustrated in FIGS. 4 and 5, the reflector 130 may be provided in a hexagonal pyramid shape. In this case, the reflector 130 may be disposed in order for a vertex to face the lens 140 and the light source 120.

The reflector 130 reflects the parallel light incident from the lens 140 at a reflection angle of 45 degrees. Therefore, the parallel light is reflected by the reflector 130 in a direction vertical to the parallel light. The reflected light travels straight until contacting an object 210 such as a wall.

Therefore, as illustrated in FIGS. 2 and 3, a lighting area is generated. In this case, as illustrated in FIG. 2, the generated lighting area has a certain thickness A. The thickness A of the lighting area may be formed by 1/2 of a width.

Alternatively, the thickness A of the lighting area may be formed equal to or less than a height of the reflector 130. To provide a detailed description, the vertex of the reflector 130 may be disposed on a line L₁that joins a cross-sectional end point of the absorber 110, and a width of the reflector 130 may be formed equal to a width of the absorber 110 or the lens 140. In this case, the thickness A of the lighting area may be equal to a height of the reflector 130.

On the other hand, the vertex of the reflector 130 may be disposed on the line L₁that joins the cross-sectional end point of the absorber 110, and the width of the reflector 130 may be formed greater than the width of the absorber 110 or the lens 140. In this case, the thickness A of the lighting area may be less than the height of the reflector 130.

As described above, the present invention generates the lighting area having the thickness A by using the reflector 130 having a hone shape. In this case, the generated lighting area may act as a lighting partition (a light wall) that divides a space. A direction of the lighting area may be changed depending on a position and a direction which the lighting device 100 is installed at and in.

Subsequently, the absorber 110 is disposed opposite to the lens 140 with the light source 120 therebetween, and the light source 120 is disposed therein. The absorber 110 absorbs light emitted from the light source 120. In more detail, the absorber 110 absorbs light, which is not incident on the lens 140, among lights emitted from the light source 120. Since the absorber 110 absorbs the light, which is not incident on the lens 140, among the lights emitted from the light source 120, a case where the light is reflected and is incident on the lens 140 is prevented.

A surface of the absorber 110 facing the light source 120 includes an absorption surface, and as illustrated in FIG. 1, a cross-sectional surface may be formed in a semicircular, elliptical, or parabolic shape to absorb the light emitted from the light source 120. In FIG. 1, the cross-sectional surface of the absorber 110 is illustrated as having a curved surface, but is not limited thereto. In another embodiment, the absorber 110 may be implemented in various shapes such as a tetragonal shape, a rectangular shape, and a polygonal shape. In this case, the light source 120 may be provided to have an irradiation angle greater than 180, thereby enhancing light efficiency.

Second Embodiment

Referring to FIG. 6, a lighting device 100 according to the second embodiment of the present invention includes a light source 120, a lens 140, a reflector 130, and an external reflector 150. In another embodiment, the lighting device 100 may further include an absorber 110.

The light source 120, the absorber 110, the lens 140, and the reflector 130 are the same as the elements of the lighting device illustrated in FIG. 1, and thus, their descriptions are omitted. Hereinafter, elements having a difference with the lighting device according to the first embodiment will be mainly described.

The lighting device according to the second embodiment of the present invention may further include the external reflector 150. The external reflector 150 is disposed apart from the reflector 130 and reflects light which is reflected by the reflector 130 and is incident thereon.

To provide a description for example, the external reflector 150 may reflect the light, which is reflected by the reflector 130 and is incident thereon, at a reflection angle of 45 degrees. The reflected light travels straight until contacting an object, such as a wall, or another reflector (not shown). Therefore, a second lighting area is generated. In this case, the generated second lighting area is perpendicular to a first lighting area and has the same thickness as that of the first lighting area. In this case, the generated second lighting area may act as a second lighting light wall that divides a space.

As described above, the lighting device according to the second embodiment of the present invention may generate a plurality of lighting areas with one lighting device by using the external reflector 150. In the present invention, although a lighting area acting as a partition is provided in plurality, the installation cost does not largely increase, and moreover, installation is easy. Also, a position at which the lighting area is provided is changed depending on a position at which the external reflector 150 is installed, and thus, space modification is easy.

Third Embodiment

FIG. 7 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a third embodiment of the present invention, FIG. 8 is an X axis cross-sectional view for describing a light blocking area adjusted by a first light blocking plate, and FIG. 9 is a cross-sectional view illustrating a lighting area, generated by the lighting device according to the third embodiment of the present invention, seen in an X axis direction.

Referring to FIG. 7, a lighting device 100 according to the third embodiment of the present invention includes a light source 120, a lens 140, a reflector 130, and a first light blocking plate 160. In another embodiment, the lighting device 100 may further include an absorber 110.

The lighting device according to the third embodiment of the present invention may further include the first light blocking plate 160. The first light blocking plate 160 may be disposed between the light source 120 and the lens 140 and may block some of light which is emitted from the light source 120 and travels to the lens 140. The first light blocking plate 160 may be provided in a fan shape with respect to a center axis on which the light source 120 is disposed, and a radius of the first blocking plate 160 may be equal to or greater than a radius of an X axis cross-sectional surface of the lens 140.

In an embodiment, as illustrated in FIG. 8, the first light blocking plate 160 may rotate about a position at which the light source 120 is disposed, and may adjust a light blocking area while rotating. For example, as illustrated in FIG. 8, the first light blocking plate 160 may rotate by 180 degrees to form the light blocking area covering half of the X axis cross-sectional surface of the lens 140. As described above, when half of the X axis cross-sectional surface of the lens 140 is covered by the first light blocking plate 160, the lighting area may be generated as in FIG. 9.

In another embodiment, the first light blocking plate 160 may be provided as one body with the absorber 110. The first light blocking plate 160 may be provided to have the light blocking area having a certain size according to demands of consumers in manufacturing the lighting device. For example, the first light blocking plate 160 may generate the light blocking area to cover half of the X axis cross-sectional surface of the lens 140.

In FIGS. 7 to 9, the first light blocking plate 160 is illustrated as being disposed between the light source 120 and the lens 140, but is not limited thereto. In another embodiment, the first light blocking plate 160 may be disposed between the lens 140 and the reflector 130. In this case, the first light blocking plate 160 may block some of parallel light which travels from the lens 140 to the reflector 130.

Fourth Embodiment

FIG. 10 is a Z axis cross-sectional view illustrating a light path in a lighting device according to a fourth embodiment of the present invention, and FIG. 11 is a diagram for describing a thickness of a lighting area adjusted by a second light blocking plate.

Referring to FIG. 10, a lighting device 100 according to the fourth embodiment of the present invention includes a light source 120, a lens 140, a reflector 130, and a second light blocking plate 170. In another embodiment, the lighting device 100 may further include an absorber 110.

The lighting device according to the fourth embodiment of the present invention may further include the second light blocking plate 170. The second light blocking plate 170 may be disposed between the light source 120 and the lens 140 and may block some of light which is emitted from the light source 120 and travels to the lens 140. The second light blocking plate 170 may be provided in a circular ring shape having a certain width with respect to a center axis on which the light source 120 is disposed, and a radius of the second blocking plate 170 may be equal to a radius of an X axis cross-sectional surface of the lens 140.

The second light blocking plate 170 may adjust a thickness of a lighting area according to a width. For example, as illustrated in FIG. 10, if the second light blocking plate 170 is provided in a circular ring shape having a first width W1, the lighting area may be generated to have a first thickness A1. Also, as illustrated in FIG. 11, if the second light blocking plate 170 is provided in a circular ring shape having a second width W2 greater than the first width W1, the lighting area may be generated to have a second thickness A2 less than the first thickness A1.

The second light blocking plate 170 may be provided as one body with the absorber 110. The second light blocking plate 170 may be provided to have a certain width according to demands of consumers in manufacturing the lighting device.

In FIGS. 10 and 11, the second light blocking plate 170 is illustrated as being disposed between the light source 120 and the lens 140, but is not limited thereto. In another embodiment, the second light blocking plate 170 may be disposed between the lens 140 and the reflector 130. In this case, the second light blocking plate 170 may block some of parallel light which travels from the lens 140 to the reflector 130.

Fifth Embodiment

Referring to FIG. 12, the lighting device according to the fifth embodiment of the present invention includes a light source 120, a first reflector 180, and a second reflector 130. The lighting device according to the fifth embodiment of the present invention has a difference with the lighting device according to the first embodiment of the present invention in that instead of the lens 140, the first reflector 180 converts light emitted from the light source 120 into parallel light. Hereinafter, such a difference will be mainly described.

The light source 120 is disposed inside the first reflector 180, and the first reflector 180 reflects the light emitted from the light source 120. In more detail, a surface of the first reflector 180 facing the light source 120 includes a reflection surface. In this case, a cross-sectional surface of the reflection surface of the first reflector 180 is provided in a parabolic shape, and thus, the reflection surface reflects the light emitted from the light source 120.

Particularly, if the light source 120 is disposed in a focus of a parabola, as illustrated in FIG. 12, the light emitted from the light source 120 may be reflected and converted into parallel light by the reflection surface. In this case, the reflection surface of the first reflector 180 may be provided in a parabolic shape satisfying the following Equation (1):

... (1)

The second reflector 130 is the same element as the above-described reflector 130 and is disposed opposite to the first reflector 180 with the light source 120 therebetween to reflect light which is reflected by the first reflector 180 and is incident thereon.

The second reflector 130 is provided in a horn shape or a truncated-horn shape. According to an embodiment, if the second reflector 130 is provided in a horn shape, the second reflector 130 may be disposed in order for a vertex to face the first reflector 180 and the light source 120. Therefore, the light reflected by the first reflector 180 may be incident on a side surface of the second reflector 130. According to another embodiment, if the second reflector 130 is provided in a truncated-horn shape, the second reflector 130 may be disposed in order for an upper surface to face the first reflector 180 and the light source 120. Accordingly, the light reflected by the first reflector 180 may be incident on a side surface of the second reflector 130.

Moreover, the second reflector 130 reflects the light, which is reflected by the first reflector 1230 and is incident thereon, at a reflection angle of 45 degrees. In more detail, when the parallel light generated through the conversion by the first reflector 180 is incident, the second reflector 130 reflects the parallel light at a reflection angle of 45 degrees. As a result, the parallel light generated through the conversion by the first reflector 180 is reflected by the second reflector 130 in a direction vertical to the parallel light. The reflected light travels straight until contacting an object 210 such as a wall.

Sixth Embodiment

Referring to FIG. 13, the lighting device according to the sixth embodiment of the present invention includes a first lighting unit 210, a second lighting unit 220, and a reflector 230. The lighting device according to the sixth embodiment of the present invention includes a plurality of lighting units, and in this regard, has a difference with the lighting device according to the first embodiment of the present invention. Hereinafter, such a difference will be mainly described.

First, the first lighting unit 210 irradiates parallel light onto the reflector 230. The first lighting unit 210 includes a first light source 212 and a first lens 214. In another embodiment, the first lighting unit 210 may further include a first absorber 216.

The first light source 212 is configured with a dot light source and radially irradiates light. In this case, an irradiation angle of the first light source 212 may be greater than 10 degrees and equal to or less than 360 degrees.

The first lens 214 converts light, emitted from the first light source 212, into parallel light. In more detail, the first lens 214 is disposed apart from the first light source 212. In this case, the first light source 212 may be disposed in a focus of the first lens 214. The first lens 214 refracts the light incident from the first light source 212 to generate the parallel light.

The first light source 212 is disposed inside the first absorber 216, and the first absorber 216 absorbs some of the light emitted from the first light source 212. In more detail, the first absorber 216 absorbs light, which is not incident on the first lens 214, among lights emitted from the first light source 212. Since the first absorber 216 absorbs the light, which is not incident on the first lens 214, among the lights emitted from the first light source 212, a case where the light is reflected and is incident on the first lens 214 is prevented.

Next, the second lighting unit 220 is disposed opposite to the first lighting unit 210 with a center axis of the reflector 230 therebetween and irradiates parallel light onto the reflector 230. The second lighting unit 220 includes a second light source 222 and a second lens 224. In another embodiment, the second lighting unit 220 may further include a second absorber 226.

The second light source 222 is configured with a dot light source and radially irradiates light. In this case, an irradiation angle of the second light source 222 may be greater than 10 degrees and equal to or less than 360 degrees.

The second lens 224 converts light, emitted from the second light source 222, into parallel light. In more detail, the second lens 224 is disposed apart from the second light source 222. In this case, the second light source 222 may be disposed in a focus of the second lens 224. The second lens 224 refracts the light incident from the second light source 222 to generate the parallel light.

The second light source 222 is disposed inside the second absorber 226, and the second absorber 226 absorbs some of the light emitted from the second light source 222. In more detail, the second absorber 226 absorbs light, which is not incident on the second lens 224, among lights emitted from the second light source 222. Since the second absorber 226 absorbs the light, which is not incident on the second lens 224, among the lights emitted from the second light source 222, a case where the light is reflected and is incident on the second lens 224 is prevented.

Next, the reflector 230 reflects the parallel light incident from the first lighting unit 210 and the second lighting unit 220. The reflector 230 may be provided in a horn shape. A center axis of the reflector 230 may pass through a space between the first lighting unit 210 and the second lighting unit 220, and the parallel light of the first lighting unit 210 and the parallel light of the second lighting unit 220 may be incident on a side surface of the reflector 230. Also, the reflector 230 may be disposed so that the first lighting unit 210 and the second lighting unit 220 are closer to a vertex than a lower surface.

Moreover, the reflector 230 reflects the parallel light, which is incident from at least one of the first lighting unit 210 and the second lighting unit 220, at a reflection angle of 45 degrees. Therefore, the parallel light is reflected by the reflector 230 in a direction vertical to the parallel light. The reflected light travels straight until contacting an object 240 such as a wall.

Moreover, each of the first lighting unit 210 and the second lighting unit 220 may be provided in plurality. A plurality of lighting units, as illustrated in FIG. 14, may be spaced apart from a center axis C of the reflector 230 by a certain distance and may be disposed in an area where the lower surface of the reflector 230 is provided. Hereinafter, an example where eight lighting units are provided will be described. However, the lighting device of the present invention is not limited thereto, and a design may be modified depending on a size or a light efficiency of a lighting unit.

Referring to FIG. 14, the first lighting unit 210 and the second lighting unit 220 may each include four lighting units. A plurality of first lighting units 210a to 210d and a plurality of second lighting units 220a to 220d may be disposed along a lower-surface circumference of the reflector 230 with respect to the center axis C of the reflector 230. In this case, the plurality of first lighting units 210a to 210d may be disposed to respectively face the plurality of second lighting units 220a to 220d with respect to the center axis C of the reflector 230.

In an embodiment, the plurality of first lighting units 210a to 210d and the plurality of second lighting units 220a to 220d may be individually supplied with power, and thus, only some lighting units may emit light.

For example, the lighting device 200 may supply the power to only the plurality of first lighting units 210a to 210d to allow light sources included in the first lighting units 210a to 210d to emit light. As illustrated in FIG. 14, the plurality of first lighting units 210a to 210d and a plurality of second lighting units 220a to 220d may emit light, and the plurality of second lighting units 220a to 220d may not emit light.

As another example, as illustrated in FIG. 15, the lighting device 200 may perform control so that lighting units nonadjacent to each other among the plurality of first lighting units 210a to 210d and the plurality of second lighting units 220a to 220d emits light.

In FIGS. 14 and 15, an example where the reflector 230 has a cone shape is described, but the reflector 230 may have a multi-angle horn shape without being limited thereto. In an embodiment, the reflector 230 may have an N-angle horn shape having N number of side surfaces. In this case, a lighting unit may be provided as N number, and each lighting unit may be disposed to correspond to each of N number of side surfaces of the reflector 230.

Although not shown, the lighting device according to the present invention may further include at least one supporter for fixing the light source 120 to the inside of the absorber 110.

In an embodiment, the lighting device may include a first supporter extending from one end point of the absorber 110 to the light source 120 and a second supporter extending from another one end point of the absorber 110 to the light source 120. The light source 120 may be fixed to the inside of the absorber 110 by the first supporter and the second supporter.

In another embodiment, the lighting device may include one supporter that joins the absorber 110 to the light source 120 along a center axis of the absorber 110.

Also, although not shown, the lighting device according to the present invention may further include at least one supporter for fixing the reflector 130 to a portion on the lens 140.

Hereinabove, the descriptions have been made with reference to the preferable embodiments of the application, but those skilled in the art may variously correct and modify the application within the technical scope which does not depart from the technical spirit and scope of the application described in the below-described claims.

Claims

A lighting device generating a light wall, the light device comprising:

a light source emitting light;

a lens converting the light emitted from the light source into parallel light; and

a reflector reflecting the parallel light incident from the lens,

wherein the reflector is provided in a horn shape, a vertex of the reflector faces the light source, and the parallel light is incident on a side surface of the reflector.
The lighting device of claim 1, wherein a width of the reflector is equal to or greater than a width of the lens.
The lighting device of claim 1, wherein the reflector reflects the parallel light, which is incident thereon, at a reflection angle of 45 degrees.
The lighting device of claim 1, wherein the lens is one of a biconvex lens, a plane-convex lens, and a meniscus convex lens.
The lighting device of claim 1, further comprising: an absorber disposed opposite to the lens with the light source therebetween,

wherein the light source is disposed inside the absorber, and the absorber absorbs light, which is not incident on the lens, among lights emitted from the light source.
The lighting device of claim 1, wherein the light source emits light having a wavelength range of 580nm to 700nm.
The lighting device of claim 1, further comprising: a first light blocking plate disposed between the light source and the reflector to block some of light traveling from the light source to the lens or block some of light traveling from the lens to the reflector,

wherein the first light blocking plate is provided in a fan shape with respect to a center axis on which the light source is disposed.
The lighting device of claim 1, further comprising: a second light blocking plate disposed between the light source and the reflector to block some of light traveling from the light source to the lens or block some of light traveling from the lens to the reflector,

wherein the second light blocking plate is provided in a circular ring shape with respect to a center axis on which the light source is disposed.
The lighting device of claim 1, further comprising: an external reflector disposed apart from the reflector to reflect light, which is reflected by the reflector and is incident thereon, at a reflection angle of 45 degrees.
A lighting device generating a light wall, the light device comprising:

a first lighting unit including a first light source emitting light and a first lens converting the light emitted from the first light source into parallel light;

a second lighting unit disposed apart from the first lighting unit, the second lighting unit including a second light source emitting light and a second lens converting the light emitted from the second light source into parallel light; and

a reflector reflecting the parallel light incident from each of the first lighting unit and the second lighting unit,

wherein the reflector is provided in a horn shape or a truncated-horn shape, a center axis of the reflector passes through a space between the first lighting unit and the second lighting unit, and the parallel light is incident on a side surface of the reflector.