JP2010073553A - Surface light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface light emitting device, which prevents the fatigue of operator's eyes and still is bright. <P>SOLUTION: A surface illumination device 200 has a surface light source in which a plurality of light emitting units 20 are arranged in rows to constitute a light emitting surface 201. The optical light emitting unit has a light distribution D<SB>L</SB>in which the brightness in at least one direction A toward an optional normal line of the light emitting surface is smaller than the brightness in other directions. A surface illumination device having a surface light source in which light emitting units are assembled to constitute a light emitting surface and disposed on a floor surface, is assumed to be worked by an operator within the light surface. The optical light emitting unit of this light illumination device has a light distribution in which the brightness in at least one direction toward an optional normal line of the light emitting surface, that is, in the direction toward an operator, is smaller than the brightness in other directions. Accordingly, brightness sufficient as a whole is ensured while keeping appropriate light emission for the operator without making the operator undergo excessive light emission or decreasing the brightness as a whole. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a planar light emitting device.

In recent years, the usage of living living dining in homes has diversified, and it is not uncommon for multiple people to use differently at the same time.
For example, as shown in FIG. 9, in a space where people are eating at a dining room and there are people who are relaxing in a living room, while feeling the presence of people in an open space, they feel private. There is a need to secure a space with a lot of space, and a method to simultaneously realize a sense of openness and privateness in a monospace has been sought.

  In such a situation, zoning that nurtures a little private feeling by using light to divide the zone without using physical partitions, but is psychologically separated even though it is an open space. The technique of being proposed is proposed. For example, a method of zoning a section of a dining room and living room with light can be considered.

  As a light source used here, a large planar illumination device formed by connecting a plurality of planar light emitting units has been proposed (Patent Document 1).

  As a means for realizing such zoning, there is considered a so-called LED direct type surface light source in which a plurality of LEDs are arranged in a planar shape as shown in FIG. It is done. A surface light source using an organic EL panel is also conceivable.

Japanese Patent Laid-Open No. 11-142652

  However, in the case of such a conventional surface light source, the luminance (brightness) is almost constant regardless of the line-of-sight direction. Assuming that work (reading a book, eating food, etc.) is performed in an area zoned with light as shown in FIG. 10 using a surface light source, the luminance difference between the work table and the surface light source becomes large. During work, the line of sight is not always directed only to the workbench, but is often directed to a surface light source or other direction. Since the amount of light entering the eye varies greatly depending on the direction of the line of sight, adjustment of the pupil of the eye and the like is frequently performed unconsciously when the line of sight is switched, which causes great eye fatigue.

  As described above, as a planar lighting fixture having a planar light source in which the light emitting units are assembled to form a light emitting surface, it is assumed that the one arranged on the floor surface works in the light emitting surface. Any light emitting part is either uniform in brightness in any direction, either irradiates excessive light to the worker or darkens as a whole, and is bright and the operator's eyes are tired There has been a demand for such a planar light emitting device.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bright planar light emitting device that does not get tired of the eyes of the operator.

Therefore, in the present invention, a planar illumination device including a planar light source that forms a light emitting surface by arranging a plurality of light emitting units, wherein at least one of the light emitting units is directed to an arbitrary normal of the light emitting surface. The light distribution is such that the luminance in at least one direction is smaller than the luminance in the other direction.
According to this configuration, as a planar lighting device having a planar light source in which the light emitting units are assembled to form a light emitting surface, what is arranged on the floor surface is assumed to work in the light emitting surface, Since an arbitrary light emitting unit has a light distribution with respect to at least one direction toward an arbitrary normal of the light emitting surface, that is, the direction in which the operator is present, the light distribution is smaller than the luminance in the other direction. Therefore, it is possible to ensure sufficient brightness as a whole while irradiating the operator with appropriate light without irradiating excessive light or darkening the whole.

According to the present invention, in the planar illumination device, the light emitting unit includes a point light source including a light distribution member, and the light distribution can be adjusted by the light distribution member.
According to this configuration, the surface light source is formed by arranging a plurality of point light sources, and the light distribution is adjusted by the light distribution member provided in each point light source. The light distribution control can be easily performed for each part.

According to the present invention, in the planar lighting device, the point light source is an LED element, and is arranged on the back side of the LED element in a movable state and made of a reflective member capable of controlling the light emission direction. It includes an optical member, and the light distribution can be adjusted by the light distribution member.
According to this configuration, it is possible to adjust the light distribution by simply changing the direction of the reflecting member such as a reflecting mirror.

According to the present invention, in the planar illumination device, the point light source is an LED element, and a light distribution member including a plurality of rotatable semi-translucent members is provided on the front side of the LED element. ,
The light distribution member includes one whose light distribution is adjustable.
According to this configuration, by arranging a plurality of hemispherical semi-translucent members and making them rotatable, it is possible to adjust the overlapping state of the respective light distribution members and easily provide a desired light distribution. It becomes.

According to the present invention, in the above planar lighting device, the pressure detection unit that detects the pressure on the light emitting surface, and the luminance with respect to the direction toward the region where the pressure detection unit detects the pressure is smaller than the luminance in the other direction. And a light distribution adjusting unit that adjusts light.
According to this configuration, the light distribution unit that detects the pressure on the light emitting surface, and the light distribution with respect to the direction toward the region (in the normal line) where the pressure detection unit has detected the pressure is smaller than the luminance in the other direction Therefore, it is possible to automatically detect the position of the operator and control the light distribution, so that efficient light distribution control can be realized.

  As described above, according to the present invention, an arbitrary light emitting section has a light distribution in which luminance in at least one direction toward an arbitrary normal of the light emitting surface is smaller than luminance in other directions. Therefore, it is possible to ensure sufficient brightness as a whole while irradiating the worker with moderate light without irradiating the worker with excessive light or darkening as a whole. It becomes possible. Here, the arbitrary normal of the light emitting surface is a normal passing through the position where the normal worker is present, and the direction toward the arbitrary normal is often the direction where the normal worker is present.

  Hereinafter, a planar light emitting device according to an embodiment of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing a planar light emitting device according to an embodiment of the present invention. FIG. 1 (a) is a perspective view, FIG. 1 (b) is an explanatory view of this cross section, and FIGS. It is explanatory drawing of the floor surface light-emission system using the.
As shown in FIGS. 1A and 1B, the planar light emitting device 200 includes a planar light source that forms a light emitting surface 201 by arranging a plurality of LED elements 20 as a light emitting unit in a grid pattern. A light distribution D, in which at least a part of the LED elements 20 has a luminance in at least one direction A toward the arbitrary normal S of the light emitting surface 201 is smaller than the luminance in other directions. It is characterized by having _L.

Here, a planar light source is configured by arranging a plurality of point light sources, each including an LED element 20 as a light emitting unit. As shown in FIG. 1B, the LED element as the point light source is mounted on a printed wiring board 210 and includes an LED chip 21 and a light distribution member 22 including a reflecting mirror disposed around the LED chip 21. is configured, by moving the light distribution member 22, the light distribution D _L is configured to be adjusted, the light toward the direction a of the eyes of the operator 400 is suppressed, the light quantity is small.

  The planar light source is housed in a housing 204, and the upper surface is configured by a light transmissive panel (light transmissive diffusion panel) 211 having low diffusibility. The upper surface of the translucent panel 211 constitutes the floor surface 202, and the other area except the peripheral edge is the light emitting surface 201.

Next, the operation of the planar light emitting device will be described.
As shown in FIG. 1, the light emitted from the LED element 20 is distributed in a direction having a peak in addition to the line-of-sight direction A because the brightness of the light toward the line-of-sight direction A of the operator is small due to the reflector as the light distribution member 22. Be controlled. In addition, since a uniformity functioning as a surface light source cannot be obtained as it is, a light transmission diffusion panel is used. However, a normal light transmissive diffusion panel has a high diffusivity, and the luminance directivity becomes uniform after passing through the panel. Therefore, a panel with a low diffusivity, that is, a light transmissive panel with low diffusivity (polypropylene) ) Is used. With this configuration, it is possible to achieve sufficient uniformity that functions as a surface light source while changing the luminance directivity.

  Actually, the position where the operator is likely to sit is determined in advance, and the light distribution member is adjusted so that the luminance distribution in the direction toward the predetermined height on the normal line at that position is reduced. To leave. In addition, several positions where the operator is likely to sit are set, so that the luminance distribution in the direction toward the predetermined height on the normal line at that position is small for any of the positions. The light distribution member may be adjusted. Furthermore, the angle of the light distribution member is determined in accordance with the position of the worker, and the operator pushes the position selection button before use, so that the worker moves toward a predetermined height on the normal line at that point. You may enable it to adjust a light distribution member so that the luminance distribution in a direction may become small. It should be noted that the light distribution member according to the height of the eyes by setting a plurality of heights such as when the operator sits on the table and when using a chair, and selecting the height. It is desirable to adjust the light distribution so that the light distribution can be adjusted.

  According to this configuration, the light emitting portion at an arbitrary point (P) on the light emitting surface has at least one direction toward an arbitrary normal line on the light emitting surface, that is, the luminance in the direction where the operator is present here, in other directions. Therefore, it is possible to irradiate the operator with light having an appropriate luminance so that eyes are not tired. Therefore, the purpose of zoning can be achieved, and the eyestrain of the operator can be eliminated. Moreover, it becomes possible to ensure sufficient brightness as a whole. Furthermore, since the brightness is not lowered for people outside the zone, a sufficient zoning effect can be maintained.

Next, an example of a floor surface light emitting system using this planar light emitting device will be described.
2 is a perspective view showing a state in which the light distribution control member 100 of the floor light emitting system using the planar light emitting device 200 shown in FIG. 1 as a light source is housed in a wall surface 1W as a surface facing the floor surface. FIG. 4 is a perspective view showing a state in which the light distribution control member 100 of the floor surface light emitting system is developed, and FIG. 4 is a side view thereof.
In this floor surface light emitting system, the light distribution control member 100 is embedded so as to constitute a part of the wall surface, and the reflection surface 100S of the light distribution control member 100 is developed in the floor surface direction to serve as a planar light source. By reflecting light from the light emitting surface 201 of the planar light emitting device 200 toward the floor surface 202, the upper surface of the desk 300 which is the work surface 300S is irradiated.

When it is desired to irradiate light toward the work surface 300S on the desk 300, the light distribution control member 100 is opened as shown in FIGS. 3 and 4, the reflective surface 100S is opened to a desired angle, and a stopper (not shown) is used. Stop and fix. Thereby, the light L0 from the planar light emitting device 200 is totally reflected by the reflection surface 100S of the light distribution control member, and the reflected light L1 irradiates the work surface 300S of the desk 300.
By adjusting the opening angle of the reflection surface 100S of the light distribution control member 100 using a remote controller (not shown) according to the position of the desk, the direction of the reflected light L1 is adjusted, and the work surface 300S is efficiently irradiated with light. It is configured to be made.

  That is, in the floor surface light emitting system according to the present invention, the light distribution control member 100 includes a reflective surface that can be stored on the wall surface 1W that stands upright with respect to the floor surface 202, and the light emitted from the planar light emitting device 200 is received. The angle formed by the reflecting surface is adjustable. Here, the light distribution control member 100 includes an axis O1 disposed on the wall surface 1W so as to be parallel to the floor surface 202, and a reflecting surface 100S rotatable with respect to the axis O1. .

According to the above configuration, it is possible to prevent direct light from entering the operator 400, and when performing visual work, the light distribution control member (a part of the wall surface) is developed in the floor surface direction. The work surface is irradiated by reflecting light from the light emitting device (floor surface) toward the floor surface.
For this reason, the light distribution control member 100 can reflect the light from the planar light emitting device 200 toward the floor surface 202 and the desk surface, so that the visibility of things when viewing on the floor surface 202 and the desk surface is improved. Can be raised.
Further, since the work surface can be illuminated with reflected light without providing separate illumination, it is simple and the space is not complicated. Moreover, since only the light from the surface light emitting device can be effectively used, it is not necessary to increase the electric energy.

  Here, the planar light emitting device 200 of the present invention includes a planar array of LED elements 20, a light distribution member (light distribution control reflector) 21, and a light transmissive panel 211 (light transmission diffusion panel) with low scattering. The surface mounting type LED element (SMD type LED element) is designed so as to reduce the light in the line-of-sight direction at the operator's main work position while adjusting the direction of the reflecting surface constituting the light distribution member 21. Has been made. The LED element may be mounted on a printed wiring board, or an SMD type LED element integrated with the board may be used so that electrical wiring is made between the LED elements. The light reflector 21 constituting the light distribution member 21 is preferably formed by using a metal such as aluminum, or a glass or plastic substrate as a base material and having a reflective surface formed by vapor deposition or sputtering. The reflection surface may be given a slight diffusion effect by subjecting the mirror surface or base material to sandblasting, dimple shape, or the like.

  Moreover, in this Embodiment, many LED elements are arranged on the printed wiring board. In each LED light source, LED elements that emit red light, green light, and blue light may be combined into one light source, or may be divided by each emission color. In addition, the light emission color of an LED element is an example, Comprising: It is not limited to this light emission color. In addition, it is possible to change the color component of a light beam by controlling the ratio of the current passed through each LED element.

  A planar light emitting device 200 is formed by disposing a casing and a light transmission diffusion panel 211 on the periphery of the light source as described above. The casing is provided with electrical contacts for connecting to electrical wiring such as walls and floors. The light transmission diffusion panel 211 is disposed above the light source, and becomes the light emitting surface 201 of the planar light emitting device 200 when the light source emits light.

  Here, as materials constituting the casing of the planar light emitting device, plastics, those in which a reinforcing filler such as glass fiber is blended, metals such as aluminum alloy, iron, magnesium alloy, wood, etc. can be applied. Although not particularly limited, it is desirable that the material be difficult to break.

  Further, examples of the constituent material of the light transmissive panel 211 that constitutes the light emitting surface 201 include translucent plastic and glass. However, the material is particularly limited as long as desired optical characteristics can be obtained and the light emitting surface 201 can have a desired appearance. Is not to be done. In addition, if an exterior such as a floorboard or a carpet is required when the lamp is turned off, a light-transmitting material similar to the exterior of the floorboard or a carpet may be laminated on the light-transmissive panel within the range that does not impair the purpose of the present invention Alternatively, a pseudo-printed light transmission panel may be used.

  The planar light emitting device 200 is disposed on the floor surface 202 as a part of the floor, but the disposition position is not particularly limited such as the center of the room or the side of the wall. Also, the arrangement may be fixed or movable. Here, as an example, an example is shown that is disposed near the wall.

Next, the light distribution control member 100 will be described.
The light distribution control member 100 shown here is incorporated in the wall surface.
When it is desired to brighten the work surface, the light distribution control member is deployed in the floor direction, and the light from the planar light emitting device is reflected toward the floor surface. The light distribution control member 100 can be rotated 180 degrees around the rotation axis. An appropriate braking mechanism is built in the rotation shaft, and can be held at an arbitrary angle within the rotation range. Therefore, since the light reflection direction can be controlled, it is possible to cope with a change in the position of the work surface. The arrangement position of the light distribution control member is not particularly limited as long as the light from the planar light emitting device can be reflected in a desired direction.

Further, the shape and size of the light distribution control member 100 are not particularly limited as long as desired optical characteristics can be obtained.
Further, the light reflection surface 100S of the light distribution control member is not particularly limited as long as desired optical characteristics such as a mirror surface and a light diffusion surface can be obtained.

  Here, as a material constituting the light distribution control member 100, plastic, a material in which a reinforcing filler such as glass fiber is blended, metal such as aluminum alloy, iron, magnesium alloy, wood, gypsum board, etc. are applied. Although it is possible, it is not particularly limited.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
FIG. 5 is a diagram showing a planar light emitting device according to Embodiment 2 of the present invention. FIG. 5 (a) is a perspective view, FIG. 5 (b) is an explanatory view of this cross section, and FIG. 6 is an enlarged view of one LED element. It is a perspective view.
In this planar light emitting device 200, the light distribution member of the LED element 20 is replaced with a reflector provided on the back surface of the LED chip 21 as compared with the planar light emitting device of the first embodiment, as shown in FIG. A hemispherical translucent film surrounding the front surface of the chip 21 is used as the light distribution member 32. The light distribution member 32 made of the hemispherical semi-transparent film includes movable pieces 32a and 32b made of hemispherical semi-transparent film that can be rotated around the LED chip, and the movable pieces 32a and 32b. The light in the direction of the operator's eyes is shielded by the degree of overlap. As shown in FIG. 5B, the LED element as the point light source is mounted on a printed wiring board 210 and is composed of an LED chip 21 and a light distribution member 32 disposed on the front surface thereof. by moving the light distribution member 32, the light distribution D _L is configured to be adjusted, the light toward the direction a of the eyes of the operator 400 is suppressed, the light quantity is small.

  The other part is formed in the same manner as the planar light emitting device of the first embodiment, and as shown in FIGS. 5A and 5B, a plurality of LED elements 20 are arranged in a grid pattern as the light emitting part. Thus, each of the LED elements 20 has a luminance with respect to a direction of the light emitting surface 201 toward the normal S of the position of the worker 400. The light distribution is smaller than the luminance in the other direction.

Also here, a planar light source is configured by arranging a plurality of point light sources composed of LED elements 20 as light emitting portions.
Here too, the light emitted from the LED element is subjected to light distribution control in a direction having a peak other than the line of sight of the operator by using the light distribution member 32 made of a hemispherical semi-transparent film. In addition, since a degree of uniformity that functions as a surface light source cannot be obtained as it is, a low-diffusion translucent panel is used. However, an ordinary low-diffusibility translucent panel has a high diffusivity, and the luminance directivity becomes uniform when it is transmitted through the panel. Therefore, a panel with a low diffusivity is used. As a result, it is possible to achieve sufficient uniformity that functions as a surface light source while changing the luminance directivity.

  Further, according to this configuration, the planar light source is formed by arranging a plurality of point light sources, and the luminance directivity is adjusted by the optical member provided in each point light source. Light distribution control of the light source can be easily performed for each part. The characteristics can be changed flexibly depending on the position and preference of the worker.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
7A and 7B are diagrams showing a planar light emitting device used in the floor light emitting system according to the third embodiment of the present invention. FIG. 7A is a perspective view, and FIG.
The planar light emitting device 200 is different from the planar light emitting device of the second embodiment in that it includes a pressure detecting unit including a pressure sensor 501. That is, the planar light emitting device 200 has a pressure detection unit that includes a pressure sensor 501 that detects the pressure on the light emission surface, and a luminance with respect to the direction in which the pressure detection unit detects pressure is smaller than the luminance in other directions. and a control box 502 of the light distribution adjusting unit for adjusting so that the light distribution D _L.

  In the planar light emitting device, the position of the worker 400 is detected based on the output from the pressure sensor 501. Based on the detection result, signal processing is performed in the control box 502, the position of the worker is automatically detected, the light distribution member of the LED element 20 is moved, the light in the direction of the worker 400 is shielded, and the worker 400 is detected. The light distribution is controlled so that the amount of light in the direction is reduced, and the amount of light incident on the eyes of the operator 400 is reduced.

  Here, the same light distribution member 32 as shown in FIG. 6 is used, and a hemispherical translucent film surrounding the front surface of the LED chip 21 is used as the light distribution member 32. The light distribution member 32 made of the hemispherical semi-transparent film includes movable pieces 32a and 32b that can be rotated around the LED chip. The overlapping of the movable pieces 32a and 32b causes the eyes of the worker to overlap. Shield light in the direction. As shown in FIG. 7B, the LED element as the point light source is mounted on a printed wiring board 210 and is composed of an LED chip 21 and a light distribution member 32 disposed on the front surface thereof. By moving the movable pieces 32a and 32b of the light distribution member 32 according to the signal output from the control box 502 based on the output of the sensor 501, the light distribution can be adjusted depending on the overlapping state. The light toward the 400 eye direction A is suppressed, and the amount of light is reduced.

  The upper layer of the pressure sensor 501 is covered with a protective sheet 212 so that the surface is flat.

  The pressure sensor 501 includes a mechanical type and an electronic type. The electronic type is further divided into a silicon diaphragm type and a stainless diaphragm type. Here, any method can be applied as long as it can sense pressure and feed back it as an electric signal.

  Further, as the protective sheet 212, a sheet-like body that protects the pressure sensor 501 and can flatten the surface is used. However, it is desirable that the protective sheet 212 is a transparent sheet that hardly loses or diffuses light. In addition, it is desirable that the material is a soft material that transmits force to the pressure sensor only in the area where pressure is actually applied. For example, polypropylene is preferable, but the material is not limited to this.

  The control box 502 is preferably used for receiving data from the pressure sensor 501 and performing data acquisition, calculation, and command.

Next, the operation of the planar light emitting device of this embodiment will be described.
FIG. 8 is a flowchart for automatically reducing the luminance value in the operator's line-of-sight direction.
First, when a person sits on the floor surface 202 of the planar light emitting device 200, the plurality of pressure sensors 501 eventually detect this (S1001).
Based on the detection result of each pressure sensor 501, the position of the central pressure sensor 501 is detected among the plurality of pressure sensors 501 that have sensed pressure (S1002).

The center position of the central pressure sensor 501 obtained by the calculation process is set as the position of the worker 400, and the position of the predetermined height H from the floor 202 on the normal line S at this position is the position of the eyes of the worker 400. A direction in which this position O is faced with respect to each LED element 20 is determined (S1003). It is assumed that the series of arithmetic processing is performed in the control box 502.
The position of the light distribution piece is controlled so that the luminance in the determined direction is minimized (S1004).

  In this manner, the light emitted from the LED chip 21 of the LED element 20 is light-distributed in a direction having a peak other than the operator's line-of-sight direction by the semi-transparent film. In addition, a translucent light diffusing panel 211 is used to increase the uniformity functioning as a surface light source. However, a normal light transmission diffusion panel has a high diffusivity, and the luminance directivity becomes uniform when it passes through the panel. Therefore, a panel with a lower diffusivity is used. As a result, it is possible to achieve sufficient uniformity that functions as a surface light source while changing the luminance directivity. The semi-translucent film is a part of a substantially hemispherical structure and can be rotated around the optical axis.

  As described above, according to the present embodiment, the pressure detection unit that detects the pressure on the light emitting surface, and the luminance with respect to the direction in which the pressure detection unit detects the pressure is smaller than the luminance in the other direction. Since it has a light distribution adjusting unit that adjusts the light distribution, it is possible to automatically detect the position of the operator and control the light distribution.

The figure which shows the planar light-emitting device which concerns on Embodiment 1 of this invention. The perspective view which shows the state at the time of the light distribution control member accommodation of the floor surface light emission system using the planar light-emitting device which concerns on Embodiment 1 of this invention. The perspective view which shows the state at the time of the light distribution control member expansion | deployment of the floor surface light emission system using the planar light-emitting device which concerns on Embodiment 1 of this invention. The side view which shows the state at the time of the light distribution control member expansion | deployment of the floor surface light emission system using the planar light-emitting device which concerns on Embodiment 1 of this invention. The figure which shows the planar light-emitting device concerning Embodiment 2 of this invention. The figure which shows the LED element used with the planar light-emitting device concerning Embodiment 2 of this invention. The figure which shows the planar light-emitting device concerning Embodiment 3 of this invention. The flowchart figure which shows the operation | movement of the planar light-emitting device concerning Embodiment 3 of this invention. The figure which shows the planar light-emitting device after zoning The figure which shows the planar light-emitting device of a prior art example

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Light distribution control member 200 Planar light-emitting device 20 LED element (light emission part)
201 Light emitting surface 202 Floor surface 211 Translucent panel 212 Protective sheet 300S Work surface 300 Desk 400 Worker 501 Pressure sensor 502 Control box

Claims (5)

A planar illumination device including a planar light source that forms a light emitting surface by arranging a plurality of light emitting units,
At least one of the light emitting units is a planar illumination device having a light distribution such that luminance in at least one direction toward an arbitrary normal line of the light emitting surface is smaller than luminance in other directions. The planar illumination device according to claim 1,
The light emitting unit is composed of a point light source provided with a light distribution member,
A planar illumination device in which light distribution is adjustable by the light distribution member. The planar illumination device according to claim 2,
The point light source is an LED element, and includes a light distribution member made of a reflective member that is arranged in a movable state and capable of controlling a light emission direction on the back side of the LED element,
A planar illumination device in which light distribution is adjustable by the light distribution member. The planar illumination device according to claim 2,
The point light source is an LED element, and includes a light distribution member made of a plurality of semi-translucent members that can rotate on the front side of the LED element.
A planar illumination device in which light distribution is adjustable by the light distribution member. The planar illumination device according to any one of claims 1 to 4,
A light detection unit that detects the pressure on the light emitting surface, and a light distribution adjustment that adjusts the luminance with respect to the direction toward the region where the pressure detection unit has detected the pressure to be a light distribution smaller than the luminance in the other direction. A planar lighting device.