JP7566616B2 - Lighting System - Google Patents

Description

The present invention relates to lighting devices and lighting systems.

Conventionally, there are lighting devices that can vary the irradiation range by changing the positions of the lens and light source (point light source), such as flashlights. Patent Document 1 discloses a lighting device that can vary the irradiation range by changing the light emission intensity of an LED lens with different light distributions. Furthermore, Patent Document 2 discloses a lighting device that can vary the irradiation range by changing the positional relationship between the light source and the reflector.

JP 2012-123945 A JP 2008-47541 A

However, conventional lighting devices use lenses and reflectors to vary the illumination range, so the light source is small, like a point light source, and can be seen from outside. Because of this, the light from the light source reaches the eyes directly and is perceived as dazzling, so it is necessary to limit the direction in which the light source emits light.

Moreover, when using lenses to vary the illumination range, as in the lighting device of Patent Document 1, the lenses themselves are expensive, so the lighting device is also expensive. Furthermore, the use of lenses can cause color unevenness.

In addition, when using a reflector to vary the illumination range, as in the lighting device of Patent Document 2, a reflector must be prepared for each LED light source, making the lighting device expensive.

In this way, in the case of lighting devices that use lenses and reflectors to change the irradiation range, the positional relationship between the lens or reflector and the light source (LED, etc.) must be assembled with high precision, so the positional relationship must also be changed with high precision.

One aspect of the present invention aims to realize a lighting device that can change the illumination range with an inexpensive configuration without using lenses or reflectors.

In order to solve the above-mentioned problems, a lighting system according to one aspect of the present invention is a lighting system including a lighting device and a mounting base on which the lighting device is mounted, the lighting device including a light source board having a light source, a cover covering the light source board and having a plurality of light exit surfaces that emit light from the light source to the outside in mutually different directions, and an area changing unit that changes a light exit area of at least one of the plurality of light exit surfaces , the area changing unit changing a relative position between the light source and the plurality of light exit surfaces to change the light exit area of at least one of the plurality of light exit surfaces, the area changing unit changing a relative position between the light source and the plurality of light exit surfaces to change the light exit area of at least one of the plurality of light exit surfaces, the light exit surfaces of the plurality of light exit surfaces being arranged on an optical axis of the light source as a first light exit surface, and light exit surfaces provided on both sides of the first light exit surface and arranged at positions off the optical axis being arranged as second light exit surfaces. When the light exit surface is a light exit surface, the area changing unit moves the light source substrate closer to or away from the first light exit surface to change the light exit area of the second light exit surface, the area changing unit has a moving mechanism for moving the light source substrate, the moving mechanism moves the light source substrate to a first position where the light exit area of the second light exit surface is larger than the light exit area of the first light exit surface and a second position where the light exit area of the second light exit surface is smaller than the light exit area of the first light exit surface, the moving mechanism has an elastic member having an elastic force that moves the light source substrate toward the second position, and moves the light source substrate from the first position to the second position by the elastic force of the elastic member, and the mounting stand includes a holding unit that holds the light source substrate at the first position with the lighting device placed on it .

According to one aspect of the present invention, the illumination range can be adjusted with an inexpensive configuration without using lenses or reflectors.

1 is a schematic perspective view of an illumination device according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating a first light distribution state of the lighting device illustrated in FIG. 1 . FIG. 4 is a diagram illustrating a second light distribution state of the lighting device shown in FIG. 1 . 3 is a diagram showing an illumination range in a first light distribution state of the lighting device shown in FIG. 1; FIG. 4 is a diagram showing an illumination range in a second light distribution state of the lighting device shown in FIG. 1 . FIG. FIG. 2 is a front view of the lighting device shown in FIG. FIG. 2 is a side view of the lighting device shown in FIG. 1 . FIG. 2 is a rear view of the lighting device shown in FIG. 1 . FIG. 2 is a bottom view of the lighting device shown in FIG. 1 . FIG. 2 is a top view of the lighting device shown in FIG. FIG. 2 is an end view of the lighting device shown in FIG. 1 when in a first light distribution state. FIG. FIG. 2 is an end view of the lighting device shown in FIG. 1 when in a second light distribution state. FIG. FIG. 2 is an end view of the lighting device shown in FIG. 1 when viewed from the side in a first light distribution state. FIG. 2 is a rear view of the lighting device shown in FIG. 1 in a first light distribution state. FIG. 2 is an end view of the lighting device shown in FIG. 1 when viewed from the side in a second light distribution state. FIG. 2 is a rear view of the lighting device shown in FIG. 1 in a second light distribution state. 2 is a diagram for explaining the structure of a locking portion included in the lighting device shown in FIG. 1 . 5A to 5C are diagrams illustrating an example of an operation of placing the illumination device illustrated in FIG. 1 on a placement stand. 5A to 5C are diagrams illustrating an example of an operation of placing the illumination device illustrated in FIG. 1 on a placement stand. 5A to 5C are diagrams illustrating an example of an operation of placing the illumination device illustrated in FIG. 1 on a placement stand. FIG. 6 is a front view of an illumination device according to a second embodiment of the present invention. 22 is a diagram illustrating a first light distribution state of the lighting device shown in FIG. 21. 22 is a diagram showing a second light distribution state of the lighting device shown in FIG. 21. FIG. 22 is a diagram illustrating a third light distribution state of the lighting device shown in FIG. 21 . FIG. 13 is a diagram showing a first light distribution state of an illumination device according to a modified example of the present invention. FIG. 13 is a diagram showing a second light distribution state of an illumination device according to a modified example of the present invention. FIG. 13 is a diagram showing a first light distribution state of an illumination device according to another modified example of the present invention. FIG. 13 is a diagram showing a second light distribution state of an illumination device according to another modified example of the present invention. FIG. 11 is a diagram showing a first orientation state of a lighting device according to a third embodiment of the present invention. FIG. 11 is a diagram showing a second orientation state of the lighting device according to the third embodiment of the present invention. FIG. 13 is a diagram showing a first light distribution state of an illumination device according to a modified example of the present invention. FIG. 13 is a diagram showing a second light distribution state of an illumination device according to a modified example of the present invention. FIG. 11 is a diagram showing a first orientation state of a lighting device according to a fourth embodiment of the present invention. FIG. 13 is a diagram showing a second orientation state of the lighting device according to the fourth embodiment of the present invention.

[Embodiment 1]
Hereinafter, one embodiment of the present invention will be described in detail.

(Outline of lighting equipment)
Fig. 1 is a schematic perspective view of a lighting device 101 according to the present embodiment. Fig. 2 is a diagram for explaining a first light distribution state of the lighting device shown in Fig. 1. Fig. 3 is a diagram for explaining a second light distribution state of the lighting device shown in Fig. 1. Fig. 4 is a diagram for explaining an illumination range in the first light distribution state of the lighting device shown in Fig. 1. Fig. 5 is a diagram for explaining an illumination range in the second orientation state of the lighting device shown in Fig. 1.

As shown in FIG. 1, the lighting device 101 includes a light source unit 10 and a power supply unit 20. The light source unit 10 uses an LED (light emitting diode) as a light source, but is not limited to this. The power supply unit 20 includes a secondary battery as a power source for driving the light source unit 10.

The power supply unit 20 is composed of a housing 21 and an operation unit 22, and supplies power to the light source unit 10. A power supply circuit 23 (Fig. 13) for controlling the light emission of the light source unit 10 is mounted inside the housing 21. The operation unit 22 has various switches 22a to 22c for operating the lighting device 101, such as turning the power on and off. By operating these switches 22a to 22c, the light emission of the light source unit 10 is controlled by the power supply circuit 23.

The light source unit 10 is composed of a housing 11 and a diffusion cover 12 that covers the housing 11. As shown in FIG. 2, an LED board (light source board) 14 on which an LED (light source) 13 is mounted and a holding part 15 that holds the LED board 14 are built into the housing 11. As shown in FIG. 3, the LED board 14 is detached from the holding part 15 of the housing 11 and moves to the top surface (first light emission surface 12a) side of the diffusion cover 12. That is, the LED board 14 is configured to be movable between a holding position (first position) by the holding part 15 of the housing 11 shown in FIG. 2 and a position (second position) on the top surface side of the diffusion cover 12 shown in FIG. 3. The moving mechanism that moves the LED board 14 will be described in detail later.

The diffusion cover 12 includes a diffusion member that diffuses the incident light, and has multiple light exit surfaces (first light exit surface 12a, second light exit surface 12b, third light exit surface 12c) that emit light from the LEDs 13 mounted on the LED board 14 in the housing 11 to the outside in different directions. The first light exit surface 12a and the third light exit surface 12c are both smaller than the second light exit surface 12b. Therefore, the area of the surface that actually emits light from the light exit surface (light exit area) is also smaller than the second light exit surface 12b for the first light exit surface 12a and the third light exit surface 12c.

2, the first light exit surface 12a is a surface located on the optical axis A of the LED 13 mounted on the LED board 14, and is a surface (front) that intersects with the optical axis A of the diffusion cover 12. The second light exit surface 12b is provided on both sides of the first light exit surface 12a, is a surface located at a position off the optical axis A of the LED 13, and is a side surface in the longitudinal direction of the diffusion cover 12. The third light exit surface 12c is adjacent to the first light exit surface 12a and the second light exit surface 12b, and is a side surface in the shorter direction of the diffusion cover 12.

As shown in FIG. 2, in the first position where the LED board 14 is held by the holding portion 15, the light exit area of the second light exit surface 12b is maximum. On the other hand, as shown in FIG. 3, in the second position where the LED board 14 has moved to the first light exit surface 12a, the light exit area of the second light exit surface 12b is minimum. Note that the light exit area of the first light exit surface 12a does not change whether the LED board 14 is in the first position or the second position. In addition, when the LED board 14 is in the first position, the luminance of the first light exit surface 12a and the second light exit surface 12b are the same, and when the LED board 14 is in the second position, the luminance of the first light exit surface 12a and the second light exit surface 12b are the same. However, the luminance is greater when the LED board 14 is in the second position than when it is in the first position.

The light distribution at each light exit surface of the diffusion cover 12 increases in proportion to the brightness and light exit area at each light exit surface.

As shown in FIG. 2, when the LED board 14 is in the first position, the luminance of the first light exit surface 12a and the second light exit surface 12b are the same, but the light exit area of the first light exit surface 12a is smaller than the light exit area of the second light exit surface 12b. Therefore, when the LED board 14 is in the first position, the light distribution 31 of the first light exit surface 12a is smaller than the light distribution 32 of the second light exit surface 12b, and the light distribution 30A in the entire diffusion cover 12 is a wide light distribution that is wider toward the second light exit surface 12b. In other words, a first light distribution state is achieved in which light is emitted not only in the direction in which light is emitted from the first light exit surface 12a, but also in the diagonal direction, that is, in the second light exit surface 12b.

On the other hand, as shown in FIG. 3, when the LED board 14 is in the second position, the luminance of the first light exit surface 12a and the second light exit surface 12b is greater than that in the first position, and is the same for each light exit surface. However, the light exit area of the second light exit surface 12b is smaller than that in the first position. Therefore, when the LED board 14 is in the second position, the light distribution 31 of the first light exit surface 12a is greater, and the light distribution 32 of the second light exit surface 12b is smaller than that in the first position, and the light distribution 30B in the entire diffusion cover 12 is a light distribution (narrow light distribution) that protrudes toward the first light exit surface 12a. In other words, a second light distribution state is achieved in which more light is emitted from the first light exit surface 12a and less light is emitted from the second light exit surface 12b, which is in an oblique direction, than when the LED board 14 is in the first position.

In this way, the light emission area of the second light emission surface 12b is changed by moving the LED board 14 along the optical axis A of the LED 13 relative to the first light emission surface 12a inside the diffusion cover 12. Specifically, the LED board 14 is moved along the optical axis A in a direction approaching the first light emission surface 12a to make the light emission area of the second light emission surface 12b smaller than that of the first light emission surface 12a. On the other hand, the LED board 14 is moved along the optical axis A in a direction away from the first light emission surface 12a to make the light emission area of the second light emission surface 12b larger than that of the first light emission surface 12a. Note that here, the LED board 14 is moved relative to the first light emission surface 12a along the optical axis A of the LED 13 inside the diffusion cover 12, but this is not limited to this, and the LED board 14 may simply be moved relative to the first light emission surface 12a inside the diffusion cover 12.

As an example of the use of the lighting device 101 having the above configuration, for example, as shown in FIG. 4, the lighting device 101 is placed on a mounting stand 201 provided on the wall of a room. Normally, the lighting device 101 does not light up, but during a power outage, the lighting device 101 lights up. At this time, the lighting device 101 has a wide light distribution with the LED board 14 in the first position as shown in FIG. 2, and the irradiation range 30C is relatively wide, so that the user 300 can see a relatively wide range even during a power outage. Then, during a power outage, for example, as shown in FIG. 5, when the user 300 removes the lighting device 101 from the mounting stand 201, the LED board 14 is in the second position as shown in FIG. 3, and the light distribution of the first light emitting surface 12a becomes large. However, since the light distribution of the second light emitting surface 12b is smaller than when the LED board 14 is in the first position, the irradiation range 30D of the lighting device 101 becomes narrower than the normal irradiation range 30C. In this way, when the lighting device 101 is placed on the mounting base 201, it functions as an emergency light (Figure 4) during a power outage, but when it is removed from the mounting base 201, it functions as a flashlight (Figure 5).

In this way, in the lighting device 101, the light distribution can be easily changed by changing the light exit area of the light exit surface of the diffusion cover 12. The structure of the lighting device 101 is described below.

(Structure of lighting device)
Fig. 6 is a front view of the lighting device 101. Fig. 7 is a side view of the lighting device 101. Fig. 8 is a rear view of the lighting device 101. Fig. 9 is a bottom view of the lighting device 101. Fig. 10 is a top view of the lighting device 101.

As shown in Figs. 6 and 7, the lighting device 101 has a first light emitting surface 12a and a second light emitting surface 12b, both of which are made of a diffusing material and are therefore milky white. As shown in Fig. 8, the light source unit 10 and the power supply unit 20 are supported by a rear plate 30. A rectangular opening 30a is formed in the rear plate 30 on the top surface 11a side of the housing 11. In this opening 30a, a locking portion 16 constituting a moving mechanism for moving the LED board 14 is provided so as to be movable in the longitudinal direction (arrow L and R direction) of the rear plate 30. The locking portion 16 is formed with an engagement portion 17 that is inserted into an engagement portion 50 (Fig. 18) of the mounting base 201 described later.

As shown in FIG. 9, a power supply terminal 20b is formed on the bottom surface 20a of the power supply unit 20. The power supply terminal 20b may be, for example, a USB (Universal Serial Bus) terminal or another terminal. The power supply terminal 20b charges a secondary battery built into the power supply unit 20 by being connected to a power supply terminal 61 (FIG. 18) of the power supply unit 60 provided on the mounting base 201 described later. Like the power supply terminal 20b, the power supply terminal 61 may be a USB (Universal Serial Bus) terminal or another terminal.

The bottom surface 20a of the power supply unit 20 is hexagonal as shown in FIG. 9. The top surface of the light source unit 10 (the surface where the top surface 11a of the housing 11 and the third light emission surface 12c of the diffusion cover 12 are joined) is hexagonal as shown in FIG. 10. Therefore, the lighting device 101 is a hexagonal column. The cross section of the short side of the diffusion cover 12 is a trapezoid in which the first light emission surface 12a, which is the upper base, is shorter than the lower base. As a result, the LED board 14 that has moved from the first position of the diffusion cover 12 (the holding position of the LED board 14 by the holding part 15) to the first light emission surface 12a side stops at the second position on the top side of the diffusion cover 12 in a state of contact with the inner surface of the second light emission surface 12b, which is the side surface. In this stopped state, the light emitted by the LEDs 13 of the LED board 14 is not emitted below the second position, but is emitted from the entire first light emitting surface 12a and a part of the second light emitting surface 12b. Therefore, by moving the LED board 14 from the first position to the second position, the light emission area of the second light emitting surface 12b can be reduced. In this way, by moving the LED board 14 between the first position and the second position, the light emission area of the second light emitting surface 12b can be changed. The movement mechanism of the LED board 14 as an area changer that changes the light emission area will be described below.

(Moving mechanism)
Fig. 11 is an end view of the lighting device 101 in a first light distribution state. Fig. 12 is an end view of the lighting device 101 in a second light distribution state. Fig. 13 is an end view of the lighting device 101 as viewed from the side in the first light distribution state. Fig. 14 is a rear view of the lighting device 101 in the first light distribution state. Fig. 15 is an end view of the lighting device 101 as viewed from the side in the second light distribution state. Fig. 16 is a rear view of the lighting device 101 in the second light distribution state. Fig. 17 is a diagram for explaining the structure of the locking portion of the lighting device 101.

The moving mechanism for moving the LED board 14 includes a support member 41, a spring (elastic member) 42, a support plate 43, and a locking portion 16, as shown in Figures 11 and 12.

As shown in FIG. 13, the support member 41 is a member that supports the LED board 14 on the rear side (the surface opposite to the surface on which the LEDs 13 are arranged). One support member 41 is provided on each side of the rear side of the LED board 14 in the longitudinal direction, and supports the LED board 14 in a flexible manner. The support member 41 provided on the power supply unit 20 side is fixed to the bottom surface of the housing 11, and the support member 41 provided on the side opposite the power supply unit 20 is fixed to a support plate 43 provided between the LED board 14 and the bottom surface of the housing 11.

The springs 42 are provided on the support plate 43, and move the LED board 14 by lifting it from the rear side with their elastic force. The springs 42 are preferably provided in a position on the rear side of the LED board 14 that lifts it up at approximately the center, but this is not limited to this. The number of springs 42 provided is also not particularly limited. In addition, the means for moving the LED board 14 is not limited to the springs 42, and may be other members.

A string 44 is tied to the upper end of the spring 42 (on the LED board 14 side), and the spring 42 can be compressed by passing the string 44 through the spiral center of the spring 42 and pulling it toward the lower end of the spring 42. On the other hand, by loosening the spring 42 while the string 44 is pulled toward the lower end of the spring 42, the spring 42 can be stretched by its elastic force.

The locking portion 16 is provided between the support plate 43 and the bottom surface of the housing 11, and is slidable in the longitudinal direction (arrow L and R directions) of the housing 11. The other end of the string 44 tied to the spring 42 is tied to the end 16a of the locking portion 16 on the power supply unit 20 side. The string 44 is adjusted to a length that causes the spring 42 to be in a most contracted state when the locking portion 16 moves to a position (contracted position) farthest from the power supply unit 20 side. As a result, when the locking portion 16 moves in the direction of the arrow R toward the contracted position, the spring 42 contracts, and the LED board 14 moves toward a position ( first position) close to the bottom surface of the housing 11. On the other hand, when the locking portion 16 moves in the direction of the arrow L from the contracted position, the string 44 loosens, and the LED board 14 moves to a position (second position ) close to the upper surface of the housing 11 (the first light emission surface 12a side of the diffusion cover 12) due to the elastic force of the spring 42 .

As shown in FIG. 14, an engagement portion 17 is formed on the surface 16b of the locking portion 16 so as to be exposed from the opening 30a of the rear panel 30. The engagement portion 17 is adapted to engage with an engagement portion 50 (FIG. 18) of the mounting base 201, which will be described later.

The engaging portion 17 will be described with reference to FIG. 17. In FIG. 17, reference numeral 1711 indicates a plan view of the engaging portion 16, reference numeral 1712 indicates a side view of the engaging portion 16, reference numeral 1713 indicates a rear view of the engaging portion 16, reference numeral 1714 indicates a cross-sectional view of reference numeral 1711 taken along line XX, and reference numeral 1715 indicates a cross-sectional view of reference numeral 1711 taken along line YY.

As shown in FIG. 17, the engagement portion 17 has a concave opening 17a formed in the center. The opening 17a is an opening that penetrates the locking portion 16. At the end of the opening 17a of the engagement portion 17 in the direction of arrow L, a hole 17b is formed that is open only on the back surface 16c side of the locking portion 16. This hole 17b is formed to a size that allows the protrusion 50a of the engagement portion 50 of the mounting base 201 described later to be inserted.

Below, we will explain a lighting system that uses the locking portion 16 in the movement mechanism of the LED board 14. Here, the lighting system includes a lighting device 101 and a mounting base 201 on which the lighting device 101 is placed.

(Lighting System)
Fig. 18 is a diagram showing a state in which the lighting device 101 is about to be placed on the mounting base 201 in the lighting system, and Fig. 19 is a diagram showing a state in which the locking portion 16 of the lighting device 101 starts to engage with the engaging portion 50 of the mounting base 201. Fig. 20 is a diagram showing a state in which the lighting device 101 has been placed on the mounting base 201.

The mounting base 201 includes a mounting plate 211 that is longer than the longitudinal length of the back plate 30 of the lighting device 101 and that comes into contact with the back plate 30 when the lighting device 101 is placed on it. Furthermore, the mounting base 201 includes an engagement portion 50 that is provided on the upper side of the mounting plate 211 and engages with the lighting device 101, and a power supply portion 60 that is provided on the lower side of the mounting plate 211 and supplies power to the lighting device 101.

The engagement portion 50 includes an upwardly projecting protrusion 50a that is inserted into a hole 17b provided in the engagement portion 17 of the locking portion 16 of the lighting device 101, and a support portion 50b that supports the protrusion 50a.

The power supply unit 60 is provided with a power supply terminal 61 that protrudes upward. The power supply terminal 61 is provided at a position where it can be inserted into the power supply terminal (concave) 20b provided in the power supply unit 20 of the lighting device 101 when the lighting device 101 is placed on the mounting base 201.

When placing the lighting device 101 at a predetermined position on the mounting base 201, first, as shown in FIG. 18, the back plate 30 of the lighting device 101 is opposed to the mounting plate 211 of the mounting base 201. At this time, after aligning the engagement portion 17 of the locking portion 16 of the lighting device 101 with the protrusion 50a of the engagement portion 50 of the mounting base 201, the lighting device 101 is moved in the direction of the arrow, and as shown in FIG. 19, the back plate 30 of the lighting device 101 is brought into contact with the mounting plate 211 of the mounting base 201. At this time, the protrusion 50a of the engagement portion 50 of the mounting base 201 enters the opening 17a of the engagement portion 17 of the lighting device 101, but is not yet inserted into the hole 17b.

The lighting device 101 is moved from the state shown in FIG. 19 in the direction of the arrow along the mounting plate 211. As a result, as shown in FIG. 20, the protrusion 50a of the engagement part 50 is inserted into the hole 17b of the engagement part 17, and the power supply terminal 61 of the power supply part 60 is inserted into the power supply terminal 20b of the power supply part 20.

18 and 19, when the lighting device 101 is not placed on the mounting base 201, the locking portion 16 is moved toward the power supply unit 20, and the LED board 14 is in the second position, i.e., the spring 42 is stretched, so-called the second light distribution state. On the other hand, when the lighting device 101 is placed on the mounting base 201, as shown in FIG. 20, the protrusion 50a of the engagement portion 50 is inserted into the hole 17b and moves downward, so that the locking portion 16 moves upward and pulls the string 44. As a result, the spring 42 contracts, and the LED board 14 moves to the first position, and the first light distribution state is achieved.

(effect)
According to the lighting device 101 having the above-described configuration, the orientation state can be changed with a simple configuration of moving the LED substrate 14 inside the diffusion cover 12, which has the effect of making it possible to vary the irradiation range with an inexpensive configuration without using lenses or reflectors.

In the lighting device 101 configured as described above, the spring 42 acts with an elastic force toward the first light emitting surface 12a within the diffusion cover 12 to move the LED board 14, but conversely, an elastic force may act toward the holding portion 15 within the diffusion cover 12. In this case, the spring 42 expands to move the LED board 14 toward the holding portion 15 when the lighting device 101 is placed on the mounting base 201, and contracts to move the LED board 14 toward the first light emitting surface 12a when the lighting device 101 is removed from the mounting base 201. The LED board 145 may also be moved by a means other than the combination of the support member 41 and the spring 42.

In the first embodiment, the diffusion cover 12 has a generally trapezoidal cross section, but is not limited to this. In the following embodiment, an example of a diffusion cover having a generally rectangular cross section will be described.

[Embodiment 2]
Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

(Outline of lighting equipment)
Fig. 21 is a schematic cross-sectional view of the lighting device 301 according to the present embodiment. Fig. 22 is a diagram for explaining a first light distribution state of the lighting device 301 shown in Fig. 21. Fig. 23 is a diagram for explaining a second light distribution state of the lighting device shown in Fig. 21. Fig. 24 is a diagram for explaining an illumination range in a third light distribution state of the lighting device 301 shown in Fig. 21. For the sake of convenience of explanation, the power supply unit is omitted from the lighting device 301 shown in Figs. 21 to 24.

As shown in FIG. 21, the lighting device 301 includes a diffusion cover 302 that covers the LED board 14. The LED board 14 moves back and forth within the diffusion cover 302 in the direction of the arrow. Note that the movement mechanism for moving the LED board 14 is not particularly limited, but the movement mechanism described in the first embodiment can be used, for example.

The diffusion cover 302 has a generally rectangular cross section in which the top surface (first light exit surface 302a) and bottom surface 302c are parallel, the side surfaces (second light exit surface 302b) are parallel, and the first light exit surface 302a and the second light exit surface 302b are perpendicular to each other. In other words, in the diffusion cover 302, the area of the first light exit surface 302a is smaller than the area of the second light exit surface 302b.

The LED board 14 moves from the bottom surface 302c to the top surface (first light emitting surface 302a) side within the diffusion cover 302. The movement of the LED board 14 is not a two-step movement from the first position to the second position as in the first embodiment, but a stepless movement from the bottom surface 302c of the diffusion cover 302 to a predetermined position on the first light emitting surface 302a side, which is the top surface.

The width of the LED board 14 is set to match the distance between the opposing second light emitting surfaces 302b. In this case, the width of the LED board 14 is set to be approximately the same length as the distance between the opposing second light emitting surfaces 302b so that light does not leak to the surface opposite the side on which the LED 13 is mounted when moving inside the diffusion cover 302.

As a result, as the LED board 14 moves within the diffusion cover 302, the area from which light is emitted on the side surface (second light emission surface 302b) of the diffusion cover 302, i.e., the light emission area, changes. For example, when the LED board 14 is on the bottom surface 302c of the diffusion cover 302, the light emission area of the second light emission surface 302b is the largest, and the light emission area becomes smaller as the LED board 14 moves away from the bottom surface 302c of the diffusion cover 302.

On the other hand, even if the LED board 14 moves within the diffusion cover 302, the light emission area at the first light emission surface 302a, which is the top surface of the diffusion cover 302, does not change.

The first light exit surface 302a and the second light exit surface 302b have the lowest brightness when the LED board 14 is on the bottom surface 302c inside the diffusion cover 302, and the brightness increases as the LED board 14 approaches the first light exit surface 302a. For example, as shown in FIG. 22, when the LED board 14 is on the bottom surface 302c of the diffusion cover 302, the distance between the LED 13 and the first light exit surface 302a and the second light exit surface 302b is long, so the brightness at the first light exit surface 302a and the second light exit surface 302b is low. On the other hand, as shown in FIG. 24, when the LED board 14 is close to the first light exit surface 302a of the diffusion cover 302, the distance between the LED 13 and the first light exit surface 302a and the second light exit surface 302b is short, so the brightness at the first light exit surface 302a and the second light exit surface 302b is high.

For example, as shown in Fig. 22, when the LED board 14 is on the bottom surface 302c of the diffusion cover 302 (when in the first position ), the luminance at the first light emitting surface 302a and the second light emitting surface 302b is low, but the light emitting area of the second light emitting surface 302b is larger than that of the first light emitting surface 302a. Therefore, the light distribution 304 of the second light emitting surface 302b is larger than the light distribution 303 of the first light emitting surface 302a. In other words, the lighting device 301 is in a first light distribution state in which the second light emitting surface 302b can emit more light than the first light emitting surface 302a in the diffusion cover 302.

24, when the LED board 14 is closest to the first light emitting surface 302a ( second position ), the luminance of the first light emitting surface 302a and the second light emitting surface 302b is high, but the light emitting area of the second light emitting surface 302b is smaller than that of the first light emitting surface 302a. Therefore, the light distribution 303 of the first light emitting surface 302a is larger than the light distribution 304 of the second light emitting surface 302b. In other words, the lighting device 301 is in a third light distribution state in which the first light emitting surface 302a can emit more light than the second light emitting surface 302b in the diffusion cover 302.

Since the LED board 14 can move steplessly within the diffusion cover 302, it is possible to stop it at any position (any position between the first position and the second position) in the middle of the diffusion cover 302, as shown in FIG. 23, for example. This allows the lighting device 301 to take a second light distribution state between the first light distribution state and the third light distribution state. For example, as shown in FIG. 23, when the LED board 14 is between the bottom surface 302c and the first light emitting surface 302a of the diffusion cover 302, the luminance at the first light emitting surface 302a and the second light emitting surface 302b is higher than when the LED board 14 is at the bottom surface 302c. On the other hand, the light emission area of the second light emitting surface 302b approaches the light emission area of the first light emitting surface 302a and becomes smaller. Therefore, the light distribution 303 of the first light exit surface 302a is larger than the first light distribution state because the brightness is higher, and the light distribution 304 of the second light exit surface 302b is smaller than in the first orientation state because the brightness is higher but the light exit area is smaller.

(effect)
According to the lighting device 301 having the above-mentioned configuration, the light distribution state can be changed simply by moving the LED board 14. Moreover, since the LED board 14 can be moved in multiple steps, not just two steps, the light distribution state can also be changed in multiple steps. Therefore, the irradiation range can be freely changed according to the application of the lighting device 301, improving the convenience of the lighting device 301.

In this embodiment, the first light exit surface 302a of the diffusion cover 302 is described as being flat, but this is not limited thereto and may be a convex surface, a spherical surface, or the like. Examples of convex surfaces and spherical surfaces are described below.

[Modification 1]
Fig. 25 is a diagram for explaining a first light distribution state of the illumination device 401 of the present modified example 1. Fig. 26 is a diagram for explaining a second light distribution state of the illumination device 401 of the present modified example 1.

The lighting device 401 has almost the same configuration as the lighting device 301 shown in FIG. 21, but the shape of the diffusion cover 402 is different. In the lighting device 301 shown in FIG. 21, the first light exit surface 302a of the diffusion cover 302 is a single surface because it is configured as a flat surface, but in the lighting device 401 shown in FIG. 25, the first light exit surface 402a of the diffusion cover 402 is a convex surface and therefore has two surfaces.

As shown in FIG. 25, the diffusion cover 402 includes two first light exit surfaces 402a that form a triangular roof on the side facing the LEDs 13 of the LED board 14, and second light exit surfaces 402b that are connected to one end of each of the first light exit surfaces 402a and are parallel to each other.

The width of the LED board 14 is set to be smaller than the distance between the opposing second light emitting surfaces 402b and to match the width of the middle of the acute angle portion formed by the two first light emitting surfaces 402a. As a result, the LED board 14 moves from the bottom surface 402c ( first position ) of the diffusion cover 402 as shown in Fig. 25 to the middle of the acute angle portion formed by the two first light emitting surfaces 402a ( second position ) as shown in Fig. 26. The width of the LED board 14 is set to a width such that the light from the LEDs 13 mounted on the LED board 14 is not emitted from the second light emitting surface 402b of the diffusion cover 402 when the LED board 14 is in the second position .

In this way, the area from which light is emitted on the side surface (second light emitting surface 402b) of the diffusion cover 402, i.e., the light emission area, changes as the LED board 14 moves within the diffusion cover 402. For example, when the LED board 14 is on the bottom surface 402c of the diffusion cover 402, the light emission areas of the first light emitting surface 402a and the second light emitting surface 402b are the largest. On the other hand, when the LED board 14 is halfway ( second position ) on the first light emitting surface 402a of the diffusion cover 402, no light is emitted from the second light emitting surface 402b, so the light emission area is 0, and the light emission area of the first light emitting surface 402a is also smaller than when it is in the first position .

In addition, when the LED board 14 is in the first position in the diffusion cover 402 as shown in FIG. 25, the luminance is the lowest, and when it is in the second position as shown in FIG. 26, the luminance is the highest. For example, as shown in FIG. 25, when the LED board 14 is in the first position , the distance between the LED 13 and the first light emitting surface 402a and the second light emitting surface 402b of the diffusion cover 402 is long, so the luminance at the first light emitting surface 402a and the second light emitting surface 402b is low. On the other hand, as shown in FIG. 26, when the LED board 14 is in the second position , the distance between the LED 13 and the first light emitting surface 402a of the diffusion cover 402 is short, so the luminance at the first light emitting surface 402a is high. When the LED board 14 is in the second position , almost no light from the LED 13 reaches the second light emitting surface 402b, so the luminance at the second light emitting surface 402b is almost 0.

Therefore, in the lighting device 401, when the LED board 14 is in the first position , as shown in Fig. 25, the luminance at the diffusion cover 402 is low, but since it is possible to irradiate light from almost the entire surface, it is possible to widen the irradiation range. On the other hand, in the lighting device 401, when the LED board 14 is in the second position , as shown in Fig. 26, light is irradiated from the first light emitting surface 402a of the diffusion cover 402. Moreover, since the LED board 14 is close to the first light emitting surface 402a, the luminance is high, and the light distribution also becomes larger toward the side facing the LED 13, so it is possible to narrow the irradiation range and increase the irradiation distance.

[Modification 2]
Fig. 27 is a diagram for explaining a first light distribution state of the illumination device 501 of the present modified example 2. Fig. 26 is a diagram for explaining a second light distribution state of the illumination device 501 of the present modified example 2.

Figure 27 is a diagram for explaining the first light distribution state of the lighting device 501 of this modified example 2. Figure 28 is a diagram for explaining the second light distribution state of the lighting device 501 of this modified example 2.

The lighting device 501 has a configuration similar to that of the lighting device 301 shown in FIG. 21, but the shape of the diffusion cover 502 is different. In the lighting device 301 shown in FIG. 21, the first light exit surface 302a of the diffusion cover 302 is a single surface because it is configured as a flat surface, but in the lighting device 501 shown in FIG. 27, the first light exit surface 502a of the diffusion cover 502 is a spherical surface.

As shown in FIG. 27, the diffusion cover 502 has a substantially elliptical cross section on the side facing the LEDs 13 of the LED board 14, which is made up of a first light emitting surface 502a having a semicircular cross section, side surfaces (second light emitting surfaces 502b) connected to both ends of the first light emitting surface 502a, and a bottom surface 502c having a semicircular cross section.

The width of the LED board 14 is set to be smaller than the distance between the opposing second light emitting surfaces 502b and larger than the maximum width of the first light emitting surface 502a and the bottom surface 502c. As a result, the LED board 14 moves from the maximum width position ( first position ) of the bottom surface 502c of the diffusion cover 502 as shown in Fig. 27 to the maximum width position ( second position ) of the two first light emitting surfaces 502a as shown in Fig. 28. The width of the LED board 14 is set to a width such that light from the LEDs 13 mounted on the LED board 14 is not emitted from the second light emitting surface 502b of the diffusion cover 502 when the LED board 14 is in the second position.

In this way, the area from which light is emitted in the diffusion cover 502, i.e., the light emission area, changes as the LED board 14 moves within the diffusion cover 502. For example, when the LED board 14 is in the first position of the diffusion cover 502, the light emission areas of the first light emission surface 502a and the second light emission surface 502b are the largest. On the other hand, when the LED board 14 is in the second position of the diffusion cover 502, almost no light is emitted from the second light emission surface 502b, so the light emission area is almost zero, and the light emission area of the first light emission surface 502a does not change from when it is in the first position .

In addition, when the LED board 14 is in the first position in the diffusion cover 502, as shown in FIG. 27, the luminance is the lowest, and when it is in the second position , as shown in FIG. 28, the luminance is the highest. For example, as shown in FIG. 27, when the LED board 14 is in the first position , the distance between the LED 13 and the first light emitting surface 502a and the second light emitting surface 502b of the diffusion cover 402 is long, so the luminance at the first light emitting surface 502a and the second light emitting surface 502b is low. On the other hand, as shown in FIG. 28, when the LED board 14 is in the second position , the distance between the LED 13 and the first light emitting surface 502a of the diffusion cover 502 is short, so the luminance at the first light emitting surface 502a is high. When the LED board 14 is in the second position , almost no light from the LED 13 reaches the second light emitting surface 502b, so the luminance at the second light emitting surface 502b is almost 0.

Therefore, in the lighting device 501, when the LED board 14 is in the first position , as shown in Fig. 27, the luminance at the diffusion cover 502 is low, but it is possible to irradiate light over almost the entire surface, so that it is possible to widen the irradiation range. On the other hand, in the lighting device 501, when the LED board 14 is in the second position , as shown in Fig. 28, the light is irradiated almost entirely from the first light emitting surface 502a of the diffusion cover 502. Moreover, since the LED board 14 is close to the first light emitting surface 502a, the luminance is high, and the light distribution also becomes larger toward the side facing the LED 13, so that it is possible to narrow the irradiation range and increase the irradiation distance.

In the above-mentioned first and second embodiments, an example is described in which the light exit area of the light exit surface is changed by moving the LED board 14 toward the light exit surface, i.e., by moving the LED 13 toward the light exit surface, but this is not limited to the above. For example, the light exit surface may be moved toward the LED 13. In other words, the relative position of the LED 13 and each light exit surface may be changed to change the light exit area of each light exit surface. Also, the light exit area of the light exit surface in the diffusion cover may be changed without moving either the LED 13 or the light exit surface. In the following third embodiment, an example is described in which the light source and the light exit surface are fixed and the light exit area is changed.

[Embodiment 3]
Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

(Outline of lighting equipment)
Fig. 29 is a diagram for explaining a first light distribution state of the lighting device 601 according to this embodiment. Fig. 30 is a diagram for explaining a second light distribution state of the lighting device 601 shown in Fig. 29. For the sake of convenience of explanation, the power supply unit of the lighting device 601 shown in Figs. 29 and 30 is omitted.

As shown in FIG. 29, the lighting device 601 includes a diffusion cover 602 that covers the LED board 14. The LED board 14 is disposed on a fixing portion 603 provided in the diffusion cover 602. The fixing portion 603 is fixed so as not to move within the diffusion cover 602.

The diffusion cover 602 includes a diffusion member that diffuses the incident light, and has multiple light exit surfaces (first light exit surface 602a, second light exit surface 602b) that emit light from the LEDs 13 mounted on the LED board 14 to the outside in different directions.

As shown in FIG. 29, the first light exit surface 602a is a surface that is arranged on the optical axis A of the LED 13 mounted on the LED board 14, and is the top surface of the diffusion cover 602. The second light exit surfaces 602b are adjacent to both sides of the first light exit surface 602a, are surfaces that are arranged at positions off the optical axis A of the LED 13, and are both side surfaces in the longitudinal direction of the diffusion cover 602.

A light-blocking shutter 604 is provided on the inside of each of both sides of the diffusion cover 602. The shutter 604 is provided on the inside of the second light-emitting surface 602b (on the LED 13 side) and moves along the second light-emitting surface 602b in a direction toward the first light-emitting surface 602a or in the opposite direction. There are no particular limitations on the movement mechanism, and the shutter 604 may be moved automatically or manually.

29, the shutter 604 is designed so that when it is moved in a direction away from the first light emitting surface 602a, the first end surface 604a on the side of the first light emitting surface 602a is at approximately the same position as the LED substrate 14. Also, as shown in FIG. 30, the shutter 604 is designed so that when it is moved in a direction toward the first light emitting surface 602a, the first end surface 604a is close to the first light emitting surface 602a, and the second end surface 604b on the opposite side of the first end surface 604a is at approximately the same position as the LED substrate 14.

29, the first light exit surface 602a and the second light exit surface 602b are not blocked by the shutter 604 (first light distribution state), and light from the LED 13 is emitted from the first light exit surface 602a and the second light exit surface 602b. Also, when the shutter 604 is in the position shown in FIG. 30, the first light exit surface 602a is not blocked, and the second light exit surface 602b is blocked by the shutter 604 (second light distribution state), and light from the LED 13 is emitted only from the first light exit surface 602a. Therefore, in the first light distribution state shown in FIG. 29, light is emitted from the first light exit surface 602a and the second light exit surface 602b, so the light exit area is large and the light distribution is also large. On the other hand, in the second light distribution state shown in Figure 30, light from the LED 13 is emitted only from the first light emission surface 602a, so the light emission area is smaller than in the state shown in Figure 29, and the light distribution is also smaller. In other words, the lighting device 601 changes the light emission area of the second light emission surface 12b by moving the shutter 604, thereby changing the light distribution state.

Also, by stopping the shutter 604 at a position between the position shown in FIG. 29 and the position shown in FIG. 30, it is possible to achieve a light distribution state intermediate between the first light distribution state and the second light distribution state. Furthermore, by moving the shutter 604 in multiple stages, it is possible to change the orientation state in multiple stages.

The shutter 604 may not be a simple shielding member, but may be a mirror with a mirror-finished inside. In this case, the light emitted by the LED 13 is reflected by the shutter 604, so that in addition to the direct light from the LED 13, the reflected light from the shutter 604 is also incident on the first light exit surface 602a and the second light exit surface 602b of the diffusion cover 602. This makes it possible to increase the amount of light emitted from the diffusion cover 602.

(effect)
According to the lighting device 601 having the above configuration, the light distribution state can be changed simply by moving the shutter 604. Moreover, since the movement of the shutter 604 can be multiple steps, not just two steps, the light distribution state can also be changed in multiple steps. Therefore, the irradiation range can be freely changed according to the application of the lighting device 601, improving the convenience of the lighting device 601.

In the lighting device 601, the second light exit surface 602b of the diffusion cover 602 is put into a light-emitting or non-light-emitting state by the shutter 604, but the light exit surface may be put into a light-emitting or non-light-emitting state by using other means. An example of putting the light exit surface into a light-emitting or non-light-emitting state by using other means is described in the following modified example.

(Modification)
Fig. 31 is a diagram for explaining a first light distribution state of the illumination device 701 of this modified example. Fig. 32 is a diagram for explaining a second light distribution state of the illumination device 701 of this modified example.

As shown in FIG. 31, the lighting device 701 includes a diffusion cover 702 that includes a diffusion member that diffuses incident light. The diffusion cover 702 includes a plurality of light exit surfaces (first light exit surface 702a, second light exit surface 702b) that emit light to the outside in mutually different directions.

The first light exit surface 702a is the top surface of the diffusion cover 702. The second light exit surfaces 702b are the side surfaces of the diffusion cover 702 provided on both sides of the first light exit surface 702a.

Three LED boards 14 are provided inside the diffusion cover 702 so as to face each of the three light exit surfaces (first light exit surface 702a, two second light exit surfaces 702b). The LED board 14 facing the first light exit surface 702a is arranged so that the optical axis A of the mounted LED 13 is perpendicular to the opposing first light exit surface 702a. Similarly, each LED board 14 facing the second light exit surface 702b is arranged so that the optical axis A of the mounted LED 13 is perpendicular to the opposing first light exit surface 702a.

The LED board 14 arranged opposite the second light emitting surface 702b is supported by the support portion 703. The support portion 703 is made of a plate-shaped light-shielding member, and is structured such that both sides are bent toward the LED board 14 around the surface on which the LED board 14 is placed. By adjusting the bending angles on both sides of the support portion 703, both sides are abutted against both sides of the second light emitting surface 702b. As a result, the LEDs 13 of the LED board 14 emit light toward the second light emitting surface 702b from the space surrounded by the second light emitting surface 702b and the support portion 703. At this time, since the light-shielding support portion 703 exists around the LEDs 13, the light of the LEDs 13 does not leak to other light emitting surfaces. The LED board 14 mounting surface side of the support portion 703 may be mirror-finished to reflect light. This makes it possible to increase the amount of light emitted from the second light emitting surface 702b.

The LED board 14 arranged opposite the first light emitting surface 702a is supported by two support parts 703 as shown in FIG. 31. As a result, the LEDs 13 of the LED board 14 emit light toward the first light emitting surface 702a from the space surrounded by the first light emitting surface 702a and the two support parts 703. At this time, the light-shielding support parts 703 are present around the LEDs 13, so that the light of the LEDs 13 does not leak to other light emitting surfaces. Note that the sides of the two support parts 703 that support the LED board 14 may be mirror-finished to reflect light. This makes it possible to increase the amount of light emitted from the first light emitting surface 702a.

In the lighting device 701, the light distribution state is changed by controlling the lighting of each of the LEDs 13 mounted on the three LED boards 14. That is, in the lighting device 701, when the LEDs 13 of all the LED boards 14 are turned on as shown in FIG. 31, a first light distribution state with wide light distribution in which light is emitted from all the light emission surfaces (first light emission surface 702a and second light emission surface 702b) of the diffusion cover 702 can be achieved. On the other hand, in the lighting device 701, when the LEDs 13 of the LED board 14 facing the first light emission surface 702a, which is the top surface of the diffusion cover 702, are emitted and the LEDs 13 of the LED board 14 facing the second light emission surface 702b, which is the side surface of the diffusion cover 702, are turned off as shown in FIG. 32, a second light distribution state with narrow light distribution in which light is emitted only from the first light emission surface 702a of the diffusion cover 702 can be achieved.

(effect)
According to the lighting device 701 having the above-described configuration, the light distribution state can be changed simply by controlling the lighting of the LEDs 13 on the LED board 14 .

In the above embodiments 1 to 3, examples were described in which the diffusion cover has multiple light exit surfaces or is spherical. In the following embodiment 4, an example is described in which the diffusion cover has one light exit surface that is flat.

[Embodiment 4]
Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

(Outline of lighting equipment)
Fig. 33 is a schematic cross-sectional view of an illumination device 801 according to this embodiment, and is a diagram for explaining a first light distribution state. Fig. 34 is a diagram for explaining a second light distribution state of the illumination device 801 shown in Fig. 33.

As shown in FIG. 33, the lighting device 801 includes a cover 802 that covers the LED board 14. The LED board 14 moves back and forth within the cover 802 in the direction of the arrow. The movement mechanism for moving the LED board 14 is not particularly limited, but the movement mechanism described in the first embodiment can be used, for example.

The cover 802 has a so-called substantially rectangular cross section in which the top surface 802a and the bottom surface 802c are parallel, the side surfaces 802b are parallel to each other, and the top surface 802a and the side surface 802b are perpendicular to each other. Here, the top surface 802a is made of a transparent material, and the side surface 802b and the bottom surface 802c are made of a material that diffuses light. Therefore, the lighting device 801 emits light from the top surface 802a and the side surface 802b. Therefore, as shown in FIG. 33, the lighting device 801 can change the amount of light emitted from the top surface 802a by moving the LED board 14 in the direction of the arrow inside the cover 802, thereby changing the light distribution. As shown in FIG. 33, when the LED board 14 is at the bottom surface 802c of the cover 802, light is emitted from the top surface 802a and the side surface 802b, and the light is diffused on the side surface 802b, resulting in a wide light distribution. On the other hand, as shown in FIG. 34, when the LED board 14 is located closest to the top surface 802a of the cover 802, most of the light is emitted from the top surface 802a, resulting in a narrower light distribution than when the LED board 14 is located on the bottom surface 802c of the cover 802.

(effect)
According to the lighting device 801 having the above-described configuration, the light distribution state can be easily changed simply by moving the LED board 14.

In the above embodiments, an LED is used as an example of the light source, but the light source is not limited to an LED and may be another light source. Also, a diffusion cover is used as an example of the cover, but the cover is not limited to a diffusion cover and may be another cover.

〔summary〕
The lighting device according to aspect 1 of the present invention includes a light source board (LED board 14) having a light source (LED 13), a cover (diffusion cover 12) covering the light source board (LED board 14) and having a plurality of light exit surfaces that emit light from the light source (LED 13) to the outside in mutually different directions, and an area changing unit (support member 41, spring 42) that changes the light exit area of at least one of the plurality of light exit surfaces.

In general, the light distribution at a light exit surface increases in proportion to the luminance and light exit area at the light exit surface. For example, if the luminance at each light exit surface is the same, the light distribution increases as the light exit area (area of the region from which light is exited) at the light exit surface increases. Therefore, as in the above configuration, the light exit area of each light exit surface is changed by the area adjustment unit, thereby making it possible to adjust the magnitude of the light distribution at each light exit surface. Moreover, since the light distribution at the light exit surface can be adjusted by simply changing the light exit area of the light exit surface, there is no need to use expensive components such as lenses and reflectors for adjusting the light distribution as in the past.

In the lighting device according to aspect 2 of the present invention, in the above aspect 1, the area change unit (support member 41, spring 42) may change the relative position between the light source (LED 13) and the multiple light exit surfaces to adjust the light exit area of at least one of the multiple light exit surfaces.

With the above configuration, the light exit area can be changed by the simple method of changing the relative position between the light source and the light exit surface, eliminating the need for expensive components such as lenses and reflectors for adjusting the light distribution, as was done in the past.

In the lighting device according to aspect 3 of the present invention, in the above aspect 2, when the light exit surface of the plurality of light exit surfaces that is arranged on the optical axis A of the light source (LED 13) is designated as the first light exit surface 12a, and the light exit surface that is adjacent to the first light exit surface 12a and arranged at a position off the optical axis A is designated as the second light exit surface 12b, the area change unit (support member 41, spring 42) may change the light exit area of the second light exit surface 12b by moving the light source board (LED board 14) closer to or farther away from the first light exit surface 12a.

According to the above configuration, the light distribution of the second light exit surface is determined taking into consideration both the brightness and the light exit area by moving the light source board closer to or farther from the first light exit surface to change the light exit area of the second light exit surface. On the other hand, even if the light source board is moved closer to or farther from the first light exit surface, the light exit area of the first light exit surface does not change, so the light distribution of the first light exit surface is determined taking into consideration the brightness. Therefore, if the brightness is the same, the magnitude of the light distribution of the first light exit surface and the second light exit surface is determined by whether the light exit area of the second exit surface is larger or smaller than the light exit area of the first light exit surface, so by changing the light exit area of the second light exit surface, it is possible to determine the light distribution balance between the first light exit surface and the second light exit surface.

In the lighting device according to aspect 4 of the present invention, in the above aspect 3, the area change unit (support member 41, spring 42) may move the light source board (LED board 14) in a direction approaching the first light emitting surface 12a to make the light emitting area of the second light emitting surface 12b smaller than the light emitting area of the first light emitting surface 12a, and move the light source board (LED board 14) in a direction away from the first light emitting surface 12a to make the light emitting area of the second light emitting surface 12b larger than the light emitting area of the first light emitting surface 12a.

According to the above configuration, by moving the light source substrate in a direction approaching the first light exit surface and making the light exit area of the second light exit surface smaller than that of the first light exit surface, if the luminance of the first light exit surface and the second light exit surface are the same, the second light exit surface has a smaller light distribution than the first exit surface. In this case, the light distribution is larger on the first light exit surface side and smaller on the second light exit surface side, resulting in a narrow light distribution (normal light distribution). On the other hand, by moving the light source substrate in a direction away from the first light exit surface and making the light exit area of the second light exit surface larger than that of the first light exit surface, if the luminance of the first light exit surface and the second light exit surface are the same, the light distribution is larger on the second light exit surface than the first exit surface. In this case, the light distribution is smaller on the first light exit surface side and larger on the second light exit surface side, resulting in a wide light distribution.

In the lighting device according to aspect 5 of the present invention, in the above aspect 3, the first light exit surface 12a is a surface that intersects with the optical axis A of the cover (diffusion cover 12), and the second light exit surface 12b is a side surface extending in the longitudinal direction of the cover (diffusion cover 12), and the light exit area may be made smaller by moving the light source board (LED board 14) closer to the first light exit surface 12a, and the light exit area may be made larger by moving the light source board (LED board 14) away from the first light exit surface 12a.

According to the above configuration, the first light exit surface is the top surface, the second light exit surface is a side surface extending in the longitudinal direction of the cover, and further, the light exit area of the second light exit surface becomes smaller as the light source substrate approaches the first light exit surface, and the light exit surface becomes larger as the light source substrate moves away from the first light exit surface, making it possible to adjust the light distribution with a simple configuration.

The lighting device according to aspect 6 of the present invention, in any one of aspects 3 to 5 above, may be configured such that the area changing portion (support member 41, spring 42) has a moving mechanism (locking portion 16, support member 41, spring 42) that moves the light source board (LED board 14), and the moving mechanism (locking portion 16) moves the light source board (LED board 14) to a second position where the light exit area of the second light exit surface 12b is smaller than the light exit area of the first light exit surface 12a, and a first position where the light exit area of the second light exit surface 12b is larger than the light exit area of the first light exit surface 12a.

In the lighting device of aspect 7 of the present invention, in the above-mentioned aspect 6, the moving mechanism (support member 41, spring 42) may have an elastic member (spring 42) that resists a force moving the light source board (LED board 14) toward the second position , and the light source board (LED board 14) may be moved from the first position to the second position by the elastic force of the elastic member (spring 42).

The above configuration makes it possible to move the light source board with a simple configuration.

An illumination system according to aspect 8 of the present invention is an illumination system comprising a mounting stand 201 for mounting the illumination device 101 described in aspect 7 above, the mounting stand 201 comprising a holding portion (engagement portion 50) for holding the light source board (LED board 14) in the first position when the illumination device 101 is mounted thereon.

In the lighting device according to aspect 9 of the present invention, in the above aspect 1, the area change unit may include a light-blocking shutter 604 that moves along at least one of the plurality of light exit surfaces, and the light exit area of the light exit surface may be changed by moving the shutter 604.

With the above configuration, the light exit area can be changed simply by moving a light-blocking shutter along the light exit surface, eliminating the need for expensive components such as lenses and reflectors for adjusting the light distribution, as was the case in the past.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, new technical features can be formed by combining the technical means disclosed in the respective embodiments.

10 Light source unit 11, 21 Housing 11a, 802a Top surface 12, 302, 402, 502, 602, 702 Diffusion cover 12a, 302a, 402a, 502a, 602a, 702a First light exit surface 12b, 302b, 402b, 502b, 602b, 702b, 702b Second light exit surface 12c Third light exit surface 13 LED (light source)
14 LED board (light source board)
15 Holding portion 16 Locking portion 16a End portion 16b Surface 16c Back surface 17, 50 Engagement portion 17a Opening 17b Hole portion 20 Power supply portion 20a, 302c, 402c, 502c, 802c Bottom surface 20b, 61 Power supply terminal 22 Operation portion 22a to 22c Switch 23 Power supply circuit 30 Back plate 30a Opening 30A, 30B, 31, 32, 303, 304 Light distribution 30C, 30D Irradiation range 41 Support member 42 Spring 43 Support plate 50a Protrusion portion 50b, 703 Support portion 60 Power supply portion 101, 301, 401, 501, 601, 701, 801 Illumination device 201 Placement base 211 Placement plate 300 User 603 Fixation portion 604 Shutter 604a First end surface 604b Second end surface 802 Cover 802b Side surface

Claims (5)

A lighting system including a lighting device and a mounting base on which the lighting device is mounted,
The lighting device includes:
a light source substrate having a light source;
a cover that covers the light source substrate and has a plurality of light exit surfaces that emit light from the light source to the outside in different directions;
an area changing unit that changes a light exit area of at least one of the plurality of light exit surfaces ,
The area changing unit is
changing a relative position between the light source and the plurality of light exit surfaces to change a light exit area of at least one of the plurality of light exit surfaces;
Among the plurality of light exit surfaces,
a light exit surface disposed on the optical axis of the light source is defined as a first light exit surface;
When the light exit surfaces provided on both sides of the first light exit surface and positioned off the optical axis are defined as second light exit surfaces,
The area changing unit is
moving the light source substrate toward or away from the first light exit surface to change the light exit area of the second light exit surface;
The area changing unit is
A moving mechanism for moving the light source substrate,
The moving mechanism includes:
a first position where a light exit area of the second light exit surface is larger than a light exit area of the first light exit surface;
a second position where a light exit area of the second light exit surface is smaller than a light exit area of the first light exit surface;
The moving mechanism includes:
the light source substrate has an elastic member having an elastic force toward the second position,
The light source substrate is moved from the first position to the second position by an elastic force of the elastic member;
The mounting table is
A lighting system comprising: a holding section that holds the light source board at the first position with the lighting device placed thereon. The area changing unit is
2. The lighting system of claim 1, wherein the light source substrate is moved in a direction approaching the first light exit surface to make the light exit area of the second light exit surface smaller than the light exit area of the first light exit surface, and the light source substrate is moved in a direction away from the first light exit surface to make the light exit area of the second light exit surface larger than the light exit area of the first light exit surface. The first light exit surface is a surface of the cover that intersects with the optical axis,
2. The lighting system of claim 1, wherein the second light exit surface is a side surface extending in a longitudinal direction of the cover , and a light exit area becomes smaller as the light source substrate approaches the first light exit surface, and a light exit area becomes larger as the light source substrate moves away from the first light exit surface. The lighting system according to claim 1 , wherein the cover is a diffusion cover including a diffusion member. The lighting system according to claim 1 , wherein the light source is an LED light source.

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