TWI856889B - Lighting - Google Patents

Abstract

The present invention provides a lighting device (100) comprising: a first light emitting element (21a), a second light emitting element (22a), and a third light emitting element (23a) disposed between the first light emitting element (21a) and the second light emitting element (22a), each of which emits light forward; and a first light guide plate (160), a second light guide plate (170), and a lens portion (180). The first light guide plate (160) has a first incident portion (161) for receiving light incident from the first light emitting element (21a), and emits the light incident from the first incident portion (161) forward. The second light guide plate (170) has a second incident portion (171) for receiving light incident from the second light emitting element (22a), and emits the light incident from the second incident portion (171) forward. The lens portion (180) is arranged in front of the third light emitting element (23a).

Description

Lighting

The present invention relates to a lighting device.

Patent document 1 discloses a planar lighting device in which a plurality of light guide plates are arranged in a planar shape. In this planar lighting device, two adjacent light guide plates are arranged so that their end faces face each other, and a small gap is provided between these end faces. Light sources are provided on the outer sides of the two light guide plates arranged in this way. [Known technical document] [Patent document]

Patent document 1: Japanese Patent Application Publication No. 2010-251021

[Problems to be solved by the present invention]

The above-mentioned conventional planar lighting device can have a relatively large flat-plate luminous surface by arranging a plurality of light guide plates side by side. However, in recent years, for example, lighting fixtures arranged for lighting of living spaces have various requirements for light performance (size, position, light irradiation range, or luminous intensity (brightness), or a combination thereof, etc. of the luminous surface). In this regard, the structure of the above-mentioned conventional planar lighting device is not easy to meet the above requirements.

This invention is proposed by the inventor of this case with a new focus on the above-mentioned problem, and its purpose is to provide a lighting device that can increase the variation of light performance. [Technical means to solve the problem]

A lighting device of one aspect of the present invention comprises: a first light emitting element and a second light emitting element, each of which emits light forward, and a third light emitting element disposed between the first light emitting element and the second light emitting element; a first light guide plate having a first incident portion for receiving light incident from the first light emitting element and emitting the light incident from the first incident portion forward; a second light guide plate having a second incident portion for receiving light incident from the second light emitting element and emitting the light incident from the second incident portion forward; and a lens portion disposed in front of the third light emitting element. [Effects of the present invention]

According to the present invention, a lighting device capable of increasing the variation of light performance can be provided.

Hereinafter, the embodiments of the present invention will be described with reference to the drawings. In addition, the embodiments described below are only specific examples of the present invention. Therefore, the numerical values, constituent elements, the configuration positions and connection forms of the constituent elements, the steps and the order of the steps, etc. shown in the following embodiments are only examples, and their main purpose is not to limit the present invention. Therefore, the constituent elements of the following embodiments that are not recorded in the independent claim items showing the highest concept of the present invention will be described as arbitrary constituent elements.

Each figure is a schematic diagram and is not drawn in a strict manner. In each figure, the same symbols are given to substantially the same components, and repeated descriptions are omitted or simplified. In each figure, the X-axis, Y-axis, and Z-axis represent the three axes of the three-dimensional orthogonal coordinate system; in this embodiment, the Z-axis direction is the vertical direction, and the direction perpendicular to the Z-axis (the direction parallel to the XY plane) is the horizontal direction. Although it is also considered that the Z-axis direction is not a vertical direction due to the usage mode, for the convenience of explanation in the following content, the Z-axis direction is described as the vertical direction.

In the following description, for example, the positive direction of the X-axis indicates the direction of the arrow of the X-axis, and the negative direction of the X-axis indicates the direction opposite to the positive direction of the X-axis. The same applies to the Y-axis direction and the Z-axis direction. When simply referred to as "the X-axis direction", it refers to the two directions or any one direction parallel to the X-axis. The same applies to the terms related to the Y-axis and the Z-axis.

Expressions such as parallel and orthogonal that indicate relative directions or positions also include situations that are not such directions or positions in a strict definition. For example, two directions being orthogonal does not mean that the two directions are completely orthogonal, but rather that they are substantially orthogonal, that is, including a difference of several percent, for example.

(Implementation) [1. Overall structure of lighting fixture 100] First, referring to FIGS. 1 to 3, the overall structure of the lighting fixture 100 of the implementation is explained. FIG. 1 is a perspective view showing the appearance of the lighting fixture 100 of the implementation. FIG. 2 is an exploded perspective view of the lighting fixture 100 of the implementation. The bottom (negative direction of the Z axis) in FIGS. 1 and 2 corresponds to the direction of the ceiling (not shown) on which the lighting fixture 100 is installed. That is, the lighting fixture 100 in FIGS. 1 and 2 is illustrated in a position opposite to that in general use. This method is also the same in FIGS. 5, 6, 8 and 10 described later. FIG. 3 is a view (top view) of the light-emitting module 10 of the implementation as viewed from the positive direction of the Z axis (hereinafter also referred to as "front")

As shown in FIG1 , the lighting fixture 100 of the present embodiment is, for example, a ceiling lamp installed on the ceiling of a building. The lighting fixture 100 of the present embodiment includes a fixture body 110 , and a light emitting module 10 and an optical component 150 installed on the fixture body 110 .

As shown in FIG. 2 and FIG. 3 , the light emitting module 10 includes a substrate 11, and a first light source unit 21, a second light source unit 22, and a third light source unit 23 disposed on a main surface 11a of the substrate 11. Light emitted forward from the first light source unit 21, the second light source unit 22, and the third light source unit 23 is used as light (illumination light) emitted from the lighting fixture 100.

The first light source section 21 includes a plurality of first light emitting elements 21a arranged in a ring shape on the main surface 11a of the substrate 11. The second light source section 22 includes a plurality of second light emitting elements 22a arranged in a ring shape on the main surface 11a of the substrate 11. The third light source section 23 includes a plurality of third light emitting elements 23a arranged in a ring shape on the main surface 11a of the substrate 11. That is, when viewed from the front, the first light source section 21, the second light source section 22, and the third light source section 23 are each formed in a ring shape. In this embodiment, when the light emitting module 10 is viewed from the front, the second light source section 22, the third light source section 23, and the first light source section 21 are arranged in sequence in a concentric circle from the center to the outside. That is, the third light source section 23 is located between the first light source section 21 and the second light source section 22.

In this embodiment, the first light-emitting element 21a, the second light-emitting element 22a, and the third light-emitting element 23a are each individually packaged SMD (Surface Mount Device) type LED (Light-Emitting Diode) elements (LED light sources). That is, the first light-emitting element 21a, the second light-emitting element 22a, and the third light-emitting element 23a each have a white container (package) made of resin or ceramic, an LED chip (bare chip) disposed in the container, and a sealing member that seals the LED chip.

The substrate 11 is a mounting substrate for mounting light-emitting elements such as the first light-emitting element 21a. In the present embodiment, the substrate 11 is formed into a ring shape when viewed from the front. The thickness of the substrate 11 is, for example, 1.0 mm. The substrate 11 is, for example, a printed wiring substrate (printed substrate) on which metal wiring is formed in a predetermined pattern. In addition, on the surface of the substrate 11, in order to protect the wiring and ensure the insulation withstand voltage, a photoresist made of an insulating resin material may be formed in a manner covering the wiring. The substrate 11 may be a single-sided wiring substrate in which wiring is formed only on the main surface 11a on which the light-emitting element is mounted, or may be a double-sided wiring substrate in which wiring is formed on both sides. The substrate 11 may also be formed by connecting a plurality of substrates in the circumferential direction. The substrate 11 may include a first substrate on which the first light source unit 21 is disposed, a second substrate on which the second light source unit 22 is disposed, and a third substrate on which the third light source unit 23 is disposed. That is, the substrate 11 of the light emitting module 10 may be realized by arranging a plurality of substrates that are different components side by side.

The device body 110 has a cylindrical first body portion 110a, and a second body portion 110b that closes an opening in the negative direction of the Z axis (hereinafter also referred to as the "rear") of the first body portion 110a. The first body portion 110a has an inwardly protruding flange portion 111 at the front end portion. An opening portion 112 is formed on the inner side of the flange portion 111 (see FIG. 2). The light-emitting module 10 is fixed to the first body portion 110a or the second body portion 110b by predetermined means such as screws not shown. Thereby, the first light source portion 21, the second light source portion 22, and the third light source portion 23 are exposed to the front from the opening portion 112 of the first body portion 110a.

The second body portion 110b forming the rear end of the device body 110 preferably has a structure (not shown) that can be engaged with a device mounting member (not shown) and can be mounted on the ceiling in a detachable manner via the device mounting member. That is, the device body 110 can also be mounted on the ceiling in a detachable manner via the device mounting member.

In this embodiment, the control unit 80 is fixed to the second body 110b. The control unit 80 includes a control circuit board for controlling the light emission state of each of the first light source unit 21, the second light source unit 22, and the third light source unit 23. The control unit 80 is electrically connected to the first light source unit 21, the second light source unit 22, and the third light source unit 23 via the cable 90. In FIG. 2, the cable 90 is schematically indicated by a thick dotted line.

More specifically, the control unit 80 changes the amount of light emitted by each of the first light source unit 21, the second light source unit 22, and the third light source unit 23 by controlling the current supplied to the first light source unit 21, the second light source unit 22, and the third light source unit 23. As a method of this control, for example, Pulse Width Modulation (PWM) control is adopted. Thereby, the amount of light emitted by each of the first light source unit 21, the second light source unit 22, and the third light source unit 23 is changed. That is, in this embodiment, the first light source unit 21, the second light source unit 22, and the third light source unit 23 of the light-emitting module 10 can be independently dimmed (brightness controlled).

In a more preferred embodiment, the first light source unit 21, the second light source unit 22, and the third light source unit 23 each include two or more light-emitting elements having different luminous colors (color temperatures). For example, in the present embodiment, the first light source unit 21 includes two or more first light-emitting elements 21a having different luminous colors (color temperatures). In the case where the plurality of first light-emitting elements 21a are divided into a first group and a second group having different luminous colors (color temperatures), the control unit 80 can independently perform dimming control on the one or more first light-emitting elements 21a included in the first group and the one or more first light-emitting elements 21a included in the second group. In this way, the color of the illumination light emitted by the first light source unit 21 is changed. That is, the control unit 80 can perform color adjustment control (control of luminous color) of the first light source unit 21. This function is also the same for the second light source unit 22 and the third light source unit 23. That is, the control unit 80 can perform color adjustment control (control of the emission color) of each of the first light source unit 21 , the second light source unit 22 , and the third light source unit 23 .

In the present embodiment, the control unit 80, for example, has a function as a power supply unit: it rectifies, smoothes, and reduces the voltage of AC power from an external power source such as a commercial power source, converts it into DC power of a predetermined standard, and supplies the DC power to the first light source unit 21, the second light source unit 22, and the third light source unit 23. That is, the AC power is supplied to the control unit 80 via a power line (VVF cable, etc.) not shown in the figure.

The optical component 150 is a component for emitting light incident from the light emitting module 10. The optical component 150 is formed using a light-transmitting (eg, transparent) resin material such as transparent acrylic.

In the present embodiment, the optical component 150 includes a first light guide plate 160, a second light guide plate 170, and a lens portion 180. The lens portion 180 is disposed between the first light guide plate 160 and the second light guide plate 170. In the present embodiment, the optical component 150 integrally includes the first light guide plate 160, the second light guide plate 170, and the lens portion 180. That is, the optical component 150, which is a single component, integrally includes three light-transmitting components (the first light guide plate 160, the second light guide plate 170, and the lens portion 180).

The first light guide plate 160 emits the light incident from the first light source unit 21 forward. The second light guide plate 170 emits the light incident from the second light source unit 22 forward. The lens unit 180 emits the light incident from the third light source unit 23 forward. In front of the lens unit 180, a light-transmitting cover member 190 is disposed.

The lighting fixture 100 of this embodiment has the optical component 150 constructed in this way and three light-emitting elements (the first light-emitting element 21a, the second light-emitting element 22a, and the third light-emitting element 23a) that can change the light-emitting state independently of each other. In this way, the variation of the light performance can be increased. The optical component 150 of this embodiment and the structure of its periphery are described below with reference to FIGS. 4 to 7C together with the above-mentioned FIGS. 1 to 3.

[2. Structure of the optical component 150 and its periphery] Fig. 4 is a diagram (rear view) showing the optical component 150 of the embodiment as viewed from the negative direction of the Z axis. Fig. 5 is a perspective view showing a cross section of a portion of the optical component 150 of the embodiment. In Fig. 5, a portion of the optical component 150 including the V-V line cross section (see Fig. 4) is shown in a perspective view. Fig. 6 is a cross-sectional view showing a cross section of a portion of the lighting fixture 100 of the embodiment. The position of the cross section in Fig. 6 is aligned with the position of the cross section in Fig. 5. In Fig. 6, the illustration of the fixture body 110 is omitted. In FIG. 6, the side surfaces of the first light-emitting element 21a, the second light-emitting element 22a, and the third light-emitting element 23a arranged at the position closest to the cross section of the optical component 150 are illustrated, and the illustration of other light-emitting elements arranged further inside (in the positive direction of the Y axis) than the cross section is omitted. These supplementary matters for FIG. 6 are also applicable to FIG. 8 and FIG. 10 described later. FIG. 7A is a top view showing a state in which only the first light source unit 21 is illuminated in the lighting fixture 100 of the embodiment. FIG. 7B is a top view showing a state in which only the second light source unit 22 is illuminated in the lighting fixture 100 of the embodiment. FIG. 7C is a top view showing a state in which only the third light source unit 23 is illuminated in the lighting fixture 100 of the embodiment.

As shown in FIGS. 4 to 6 , the optical component 150 is a disc-shaped component having a first light guide plate 160 at the edge, a second light guide plate 170 at the center, and a lens portion 180 between the first light guide plate 160 and the second light guide plate 170 .

In the present embodiment, the first light emitting element 21a, the second light emitting element 22a, and the third light emitting element 23a are arranged side by side in the lateral direction (direction perpendicular to the Z-axis direction/direction parallel to the XY plane) on the main surface 11a of the substrate 11. In FIG6, the first light emitting element 21a, the third light emitting element 23a, and the second light emitting element 22a are arranged in sequence from the negative direction of the X-axis to the positive direction of the X-axis. As shown in FIG6, the first light guide plate 160 has a first incident portion 161 into which the light from the first light emitting element 21a is incident. The first light guide plate 160 is provided to extend from the first incident portion 161 to one side in the lateral direction. The first incident portion 161 is provided as a groove recessed in the positive direction of the Z axis at the radially inner end of the annular first light guide plate 160 (see FIG. 4 ). The first incident portion 161 is opposite to the plurality of first light emitting elements 21 a of the first light source portion 21 in the Z axis direction and is provided extending along the arrangement direction of the plurality of first light emitting elements 21 a. That is, the first incident portion 161 is formed in an annular shape along the first light source portion 21.

As shown in FIG6 , the first light guide plate 160 has a first front surface portion 164 extending in the transverse direction, and a first curved portion 165 provided between the first incident portion 161 and the first front surface portion 164. When the first light source portion 21 emits light under the control of the control portion 80, light is incident from the first light source portion 21 to the first incident portion 161. The light incident to the first incident portion 161 is repeatedly reflected by the first curved portion 165 and reaches the first front surface portion 164, and is emitted forward from the first front surface portion 164. Thus, as shown in FIG7A , a circular and planar light-emitting surface is formed at the edge of the lighting fixture 100.

In order to efficiently extract the light incident on the first front surface portion 164 to the outside, for example, a concave-convex portion in which tiny concave portions or convex portions are arranged can be formed on the back surface (the surface in the negative direction of the Z axis) of the first front surface portion 164. In this way, the light heading to the back surface can be scattered by the concave-convex portion inside the first front surface portion 164 and directed to the front. As a result, the efficiency of extracting the light from the first front surface portion 164 to the front is improved.

As shown in FIG6 , the second light guide plate 170 has a second incident portion 171 into which the light from the second light emitting element 22a is incident. The second incident portion 171 is provided as a groove recessed in the positive direction of the Z axis at the radially outer end of the circular second light guide plate 170 (refer to FIG4 ). The second incident portion 171 is opposite to the plurality of second light emitting elements 22a of the second light source unit 22 in the Z axis direction and is provided extending along the arrangement direction of the plurality of second light emitting elements 22a. That is, the second incident portion 171 is formed in a ring shape along the second light source unit 22.

As shown in FIG6 , the second light guide plate 170 has a second front surface portion 174 extending in the transverse direction, and a second curved portion 175 provided between the second incident portion 171 and the second front surface portion 174. When the second light source portion 22 emits light under the control of the control portion 80, light is incident from the second light source portion 22 to the second incident portion 171. The light incident to the second incident portion 171 is repeatedly reflected by the second curved portion 175 and reaches the second front surface portion 174, and is emitted forward from the second front surface portion 174. Thus, as shown in FIG7B , a circular and planar light-emitting surface is formed in the central portion of the lighting device 100.

In order to efficiently extract the light incident on the second front surface 174 to the outside, for example, a concave-convex portion in which tiny concave portions or convex portions are arranged can be formed on the back side (the surface in the negative direction of the Z axis) of the second front surface 174. In this way, the light heading to the back side can be scattered by the concave-convex portion inside the second front surface 174 and directed to the front side. As a result, the efficiency of extracting the light from the second front surface 174 to the front side is improved.

As shown in FIG6 , the lens section 180 has a lens 181 at a position opposite to the third light emitting element 23a. More specifically, the lens section 180 has a plurality of lenses 181 corresponding to the plurality of third light emitting elements 23a of the third light source section 23 in a one-to-one manner. The lens section 180 is disposed between the first light guide plate 160 and the second light guide plate 170 as a ring-shaped portion including a plurality of lenses 181 arranged in a ring shape.

As shown in Fig. 4 to Fig. 6, the lens 181 has a recess 181a for accommodating the third light emitting element 23a. The light emitted by the third light emitting element 23a enters the lens 181 from the recess 181a and is emitted forward. In this embodiment, the lens 181 is a focusing lens, so that light with a smaller light distribution angle is emitted forward from the lens 181.

When the third light source unit 23 emits light under the control of the control unit 80, light from the third light source unit 23 is incident on the lens unit 180. The light incident on the lens unit 180 is further emitted forward through the cover member 190 in front of the lens unit 180. As a result, a circular light-emitting surface is formed at the radial middle position of the lighting device 100 as shown in FIG. 7C.

In this embodiment, a cover member 190 covering the lens portion 180 is disposed in front of the lens portion 180. The cover member 190 is formed of a light-transmitting resin material such as acrylic resin. In this way, in the optical component 150, by covering the portion of the lens portion 180 that is concave in the negative direction of the Z axis with the flat cover member 190, the front surface of the optical component 150 becomes a nearly flat appearance.

The covering member 190 can also be manufactured by injection molding a resin material in which light-diffusing particles are dispersed. In this case, the covering member 190 can diffuse the light emitted from each of the plurality of lenses 181 and emit it forward. The covering member 190 can also form a milky white light-diffusing layer, or a plurality of light-diffusing points, or tiny bumps (wrinkles) on the inner surface or the outer surface to have a light-diffusing function. In either case, by making the covering member 190 have a light-diffusing function, the light from each lens 181 becomes a point-shaped light (bright spot) and is not easily conspicuous. In addition, the light-diffusing function of the covering member 190 is not necessary, and it can also be a light-transmitting member that is generally recognized as transparent. The cover member 190 may have, in addition to or instead of the above-mentioned structure for light diffusion (light diffusion particles or wrinkles, etc.), a concave-convex portion for controlling the light distribution angle of the light emitted from the lens portion 180 .

The covering member 190 is formed in a size and shape covering the first curved portion 165 of the first light guide plate 160 and the second curved portion 175 of the second light guide plate 170. Specifically, the covering member 190 has a first covering end portion 196 located in front of the first curved portion 165 and a second covering end portion 197 located in front of the second curved portion 175. Thus, when the lighting fixture 100 is installed on the ceiling, the amount of light that leaks from the gap between the covering member 190 and the first light guide plate 160 and the second light guide plate 170 and goes directly downward (in the positive direction of the Z axis) can be reduced. That is, the possibility that the gap becomes a linear light and becomes conspicuous is reduced.

Thus, in this embodiment, the lighting fixture 100 has three light-transmitting components (the first light guide plate 160, the second light guide plate 170, and the lens portion 180) that are arranged in different positions and shapes. The lighting fixture 100 further has three light source portions (the first light source portion 21, the second light source portion 22, and the third light source portion 23) that correspond to the three light-transmitting components, respectively. This can increase the variety of light performances.

More specifically, the lighting device 100 can emit lighting light with a plurality of light patterns including the three light patterns shown in FIG. 7A to FIG. 7C. The plurality of light patterns include the three light patterns shown in FIG. 7A to FIG. 7C, light patterns generated by combining these light patterns, and light patterns in which the light intensity (brightness) or/and light color of each light pattern are changed. That is, in this embodiment, the control unit 80 can perform dimming control (including turning on and off) and color adjustment control of the first light source unit 21, the second light source unit 22, and the third light source unit 23. Furthermore, the lighting fixture 100 comprises: a first light guide plate 160 forming a ring-shaped and planar light emitting surface; a second light guide plate 170 forming a circular and planar light emitting surface; and a lens portion 180 emitting a ring-shaped illumination light having a smaller light distribution angle between the first light guide plate 160 and the second light guide plate 170. In this way, the lighting fixture 100 of this embodiment can perform various light performances by using three light-transmitting components (the first light guide plate 160, the second light guide plate 170, and the lens portion 180) having different optical structures and a combination of the intensity and/or color of the light supplied to these three light-transmitting components.

The lighting fixture 100 of the present embodiment configured as described above is described as follows, for example.

(1) The lighting fixture 100 of the present embodiment comprises: a first light emitting element 21a, a second light emitting element 22a, each emitting light forward, and a third light emitting element 23a disposed between the first light emitting element 21a and the second light emitting element 22a; and a first light guide plate 160, a second light guide plate 170, and a lens portion 180. The first light guide plate 160 has a first incident portion 161 for receiving light incident from the first light emitting element 21a, and emits the light incident from the first incident portion 161 forward. The second light guide plate 170 has a second incident portion 171 for receiving light incident from the second light emitting element 22a, and emits the light incident from the second incident portion 171 forward. The lens portion 180 is disposed in front of the third light emitting element 23a.

Thus, the lighting fixture 100 of this embodiment has three light-transmitting components, namely the first light guide plate 160, the second light guide plate 170, and the lens portion 180, and light-emitting elements are arranged corresponding to each light-transmitting component. Therefore, the variety of light performances performed by the lighting fixture 100 can be increased.

(2) The lighting fixture 100 described in (1) above is configured as follows in a more preferred embodiment. As shown in FIGS. 2 and 3 , when the lighting fixture 100 is viewed from the front, a first light source portion 21 is formed in a ring shape by arranging a plurality of first light-emitting elements 21a in a ring shape. A second light source portion 22 is formed in a ring shape by arranging a plurality of second light-emitting elements 22a in a ring shape. A third light source portion 23 is formed in a ring shape by arranging a plurality of third light-emitting elements 23a in a ring shape. The second light source portion 22 is located on the inner side of the third light source portion 23, and the third light source portion 23 is located on the inner side of the first light source portion 21. As shown in FIGS. 4 to 6 , the first incident portion 161 of the first light guide plate 160 is formed in a ring shape along the first light source portion 21. The second incident portion 171 of the second light guide plate 170 is formed in a ring shape along the second light source portion 22 . The lens portion 180 is formed in a ring shape along the third light source portion 23 .

According to this configuration, in the lighting fixture 100, the first light emitting element 21a, the second light emitting element 22a, and the third light emitting element 23a are each arranged in a ring shape. Thus, for example, as shown in FIG. 2 and FIG. 3, three light source units (the first light source unit 21, the second light source unit 22, and the third light source unit 23) are formed in a multiple ring shape. Therefore, for example, a lighting fixture 100 that is circular when viewed from the front and can increase the variation of light performance is realized.

(3) In the lighting fixture 100 described in (2) above, in a more preferred embodiment, the lens portion 180 includes a plurality of lenses 181 corresponding to the plurality of third light emitting elements 23a in a one-to-one manner.

According to this configuration, the light distribution angle of the light emitted from each of the plurality of third light emitting elements 23a can be controlled by the individual lenses 181. Therefore, for example, a more elaborate light show can be performed.

(4) The lighting fixture 100 described in any one of the above (1) to (3) is constructed as follows in a more preferred embodiment. For example, as shown in FIG6, the first light-emitting element 21a, the second light-emitting element 22a, and the third light-emitting element 23a are arranged side by side in a transverse direction (the X-axis direction in FIG6) that is orthogonal to the front-rear direction. The first light-emitting element 21a is arranged on one side of the third light-emitting element 23a in the transverse direction. The second light-emitting element 22a is arranged on the other side of the third light-emitting element 23a in the transverse direction. The first light guide plate 160 is provided to extend from the first incident portion 161 to one side in the transverse direction. The second light guide plate 170 is provided to extend from the second incident portion 171 to the other side in the transverse direction. In FIG. 6 , one side of the transverse direction is the negative direction of the X-axis, and the other side of the transverse direction is the positive direction of the X-axis.

According to this structure, the light rays emitted by the first light emitting element 21a and the second light emitting element 22a at the two ends of the three light emitting elements arranged side by side in the horizontal direction are guided to the outside by the first light guide plate 160 and the second light guide plate 170 and emitted forward. Furthermore, the light rays emitted by the third light emitting element 23a at the center of the three light emitting elements are emitted forward by the optical effect produced by the lens portion 180. Therefore, according to the lighting device 100, the lighting light to be performed can be emitted to the front of the lighting device 100 and to a wider range.

(5) The lighting fixture 100 described in (4) above is configured as follows in a more preferred embodiment. The lighting fixture 100 is further provided with a light-transmitting covering member 190 disposed in front of the lens portion 180. The first light guide plate 160 has a first front surface portion 164 extending in the transverse direction, and a first curved portion 165 provided between the first incident portion 161 and the first front surface portion 164. The second light guide plate 170 has a second front surface portion 174 extending in the transverse direction, and a second curved portion 175 provided between the second incident portion 171 and the second front surface portion 174. The covering member 190 has a first covering end portion 196 located in front of the first curved portion 165, and a second covering end portion 197 located in front of the second curved portion 175.

According to this structure, the first curved portion 165 and the second curved portion 175 are covered by the covering member 190 when viewed from the front. As a result, as described above, the possibility that the gap between the covering member 190 and the first light guide plate 160 and the second light guide plate 170 becomes a linear light and becomes conspicuous is reduced. As a result, for example, in terms of appearance, a visual effect that the first light guide plate 160, the covering member 190, and the second light guide plate 170 are continuous can be produced.

In addition, an air layer is preferably present between the first cover end 196 of the cover member 190 and the first curved portion 165, and between the second cover end 197 of the cover member 190 and the second curved portion 175. That is, the cover member 190 is preferably fixed to the optical member 150 in a state where the cover member 190 is separated from the first curved portion 165 and the second curved portion 175 in the Z-axis direction. Thus, light incident on the interface with the outside in the first curved portion 165 of the first light guide plate 160 and the second curved portion 175 of the second light guide plate 170 is less likely to enter the cover member 190. That is, the amount of light totally reflected by the interface with the outside is less likely to decrease in the first curved portion 165 and the second curved portion 175. As a result, the reduction in the amount of light emitted forward from the first front surface portion 164 and the second front surface portion 174 due to the arrangement of the cover member 190 is suppressed.

(6) The lighting fixture 100 described in any one of (1) to (5) above is configured as follows in a more preferred embodiment: In the lighting fixture 100, the first light guide plate 160, the second light guide plate 170, and the lens portion 180 are integrally provided.

According to this structure, a single component (optical component 150 in this embodiment) is integrally provided with three light-transmitting components (first light guide plate 160, second light guide plate 170, and lens portion 180) of different configuration positions and shapes. This can reduce the number of components of the lighting fixture 100 to increase the variation of light performance, or improve the manufacturing efficiency of the lighting fixture 100. For example, when assembling the lighting fixture 100, by determining the position of any one of the first light guide plate 160, the second light guide plate 170, and the lens portion 180 relative to the fixture body 110, the positions of these three light-transmitting components are determined at the same time.

(7) The lighting fixture 100 described in any one of (1) to (6) above, in a more preferred embodiment, includes a control unit 80 that controls the first light emitting element 21a, the second light emitting element 22a, and the third light emitting element 23a independently of each other.

According to this configuration, as shown in Fig. 2, the lighting fixture 100 can have a built-in control unit 80 for changing the light states of the first light emitting element 21a, the second light emitting element 22a, and the third light emitting element 23a. Therefore, for example, the installation of the lighting fixture 100 on the ceiling can be simplified, which can increase the variation of the light show.

In a more preferred embodiment, the control unit 80 can perform dimming control and color adjustment control on each of the first light source unit 21, the second light source unit 22, and the third light source unit 23. In this way, the variation of the light performance can be further increased.

Although the lighting fixture 100 of the present embodiment has been described above, the configuration of the lighting fixture 100 is not limited to that described in the above embodiment. Therefore, a modification of the configuration of the lighting fixture 100 will be described with the focus on the differences from the above embodiment.

[3-1, Modification 1] FIG. 8 is a cross-sectional view showing a portion of a lighting fixture 100a of Modification 1 of the embodiment. As shown in FIG. 8 , the lighting fixture 100a includes a first light emitting element 21a, a second light emitting element 22a, a third light emitting element 23a, a first light guide plate 160, a second light guide plate 170, and a lens portion 180. These structures are common to the lighting fixture 100 of the embodiment shown in FIGS. 1 to 6 .

The lighting fixture 100a of this modification is different from the lighting fixture 100 of the embodiment in that it has a cover member 290 whose end is formed thinner. Specifically, in this modification, the cover member 290 has a first cover end 296 located in front of the first curved portion 165 and a second cover end 297 located in front of the second curved portion 175. The first cover end 296 forms a surface facing the first curved portion 165 in a curved shape along the first curved portion 165. The second cover end 297 forms a surface facing the second curved portion 175 in a curved shape along the second curved portion 175.

According to this structure, the step difference of the end of the covering member 290 in the lateral direction (X-axis direction in FIG. 8 ) can be reduced. That is, the step difference formed by the first covering end 296 and the first light guide plate 160 can be reduced. Furthermore, the step difference formed by the second covering end 297 and the second light guide plate 170 can be reduced. Thereby, for example, the boundary between the covering member 290 and the first light guide plate 160 and the second light guide plate 170 is not easily conspicuous. In addition, such visual effects can be produced, and the thickness of the portion of the covering member 290 opposite to the lens portion 180 can be made the same as that of the covering member 190 of the embodiment, or thicker than the covering member 190. Therefore, in the case where a recess is formed in the covering member 290 for obtaining a certain optical effect, a deeper recess can be formed.

[3-2, Modification 2] FIG. 9 is a top view of a lighting fixture 100b of Modification 2 of the embodiment. FIG. 10 is a cross-sectional view showing a portion of the cross section of the lighting fixture 100b of Modification 2 of the embodiment. As shown in FIG. 9 and FIG. 10, the lighting fixture 100b has a first light-emitting element 21a, a second light-emitting element 22a, a third light-emitting element 23a, a first light guide plate 160a, a second light guide plate 170a, and a lens portion 180a.

Although not shown in FIG9 and FIG10, a plurality of first light emitting elements 21a, second light emitting elements 22a, and third light emitting elements 23a are arranged on the substrate 11 of the light emitting module 10a. The first light source section 21 is formed by the plurality of first light emitting elements 21a, the second light source section 22 is formed by the plurality of second light emitting elements 22a, and the third light source section 23 is formed by the plurality of third light emitting elements 23a. The light emitting states (light emitting intensity and/or color temperature, etc.) of these light source sections are independently controlled by the control section 80 (not shown in FIG9 and FIG10).

In this modification, the first light guide plate 160a, the second light guide plate 170a, and the lens portion 180a are integrally provided. Specifically, the optical component 150a is integrally provided with the first light guide plate 160a, the second light guide plate 170a, and the lens portion 180a. The lens portion 180a has a plurality of lenses 181 (only one is shown in FIG. 10 ) corresponding to the plurality of third light emitting elements 23a in a one-to-one manner. In the lighting fixture 100b, the first light emitting element 21a, the second light emitting element 22a, and the third light emitting element 23a are arranged side by side in the transverse direction (the X-axis direction in FIG. 10 ); the first light guide plate 160a is provided to extend from the first incident portion 161 to one side of the transverse direction; and the second light guide plate 170a is provided to extend from the second incident portion 171 to the other side of the transverse direction. In FIG. 10 , one side of the transverse direction is the negative direction of the X-axis, and the other side of the transverse direction is the positive direction of the X-axis. The lighting fixture 100b is further provided with a light-transmissive cover member 190a arranged in front of the lens portion 180a.

Regarding the above structure, the lighting fixture 100b of this variant is common to the lighting fixture 100 of the embodiment. In this variant, the lighting fixture 100b is formed into a rectangle when observed from the front, and is different from the lighting fixture 100 in this respect. More specifically, the optical component 150a has a first light guide plate 160a, a second light guide plate 170a, and a lens portion 180a arranged between the first light guide plate 160a and the second light guide plate 170a, and these three light-transmitting components are all rectangular. In addition, a plurality of first light-emitting elements 21a, a plurality of second light-emitting elements 22a, and a plurality of third light-emitting elements 23a are each arranged in a straight line along the Y-axis direction. Therefore, the first light source portion 21, the second light source portion 22, and the third light source portion 23 are each formed in a straight line along the Y-axis direction. In the lens portion 180a, a plurality of lenses 181 are arranged in a straight line along the Y-axis direction.

When observed from the front, the lighting fixture 100b thus constructed has a light-emitting portion (central light-emitting portion) that emits illumination light with a narrow light distribution angle disposed in the center portion in the X-axis direction, and rectangular plane light-emitting portions disposed on both sides of the central light-emitting portion in the X-axis direction. Furthermore, the light source of the central light-emitting portion, i.e., the third light source portion 23, and the light sources of the two plane light-emitting portions, i.e., the first light source portion 21 and the second light source portion 22, are independently controlled by the control portion 80 (not shown in FIGS. 9 and 10). Therefore, the lighting fixture 100b of this variant can perform a variety of light performances by means of three light-transmitting components (the first light guide plate 160a, the second light guide plate 170a, and the lens portion 180a) having different optical structures from each other, and a combination of the intensity and/or color of the light supplied to these three light-transmitting components.

The cover member 190a of this modification can also have a light diffusion function similar to the cover member 190 of the embodiment. The cover member 190a of this modification can also form a surface facing the first curved portion 165a in a curved shape along the first curved portion 165a similar to the cover member 290 of modification 1. The cover member 190a can also form a surface facing the second curved portion 175a in a curved shape along the second curved portion 175a.

[4. Other variations] Although the present invention has been described above based on the embodiments and variations thereof, the present invention is not limited to the embodiments and variations described above.

In the present embodiment, the control unit 80 has the function of a power supply unit for supplying electric power for emitting light to the light-emitting module 10. However, it is not necessary for the control unit 80 to have the function of a power supply unit. For example, the lighting device 100 may also have: a power supply unit for rectifying, smoothing, and reducing the voltage of AC power such as commercial power to convert it into DC power of a predetermined standard; and a control unit 80 provided separately from the power supply unit for controlling the power supply unit.

The control unit 80 may not be housed in the device body 110 of the lighting device 100. For example, the control unit 80 may be housed in a housing provided outside the device body 110. In this case, if the control unit 80 and the light emitting module 10 are electrically connected by a cable 90 or the like, the light emitting pattern of the light emitting module 10 can be controlled.

The control unit 80 does not necessarily need to be able to perform dimming control and color adjustment control of the first light source unit 21, the second light source unit 22, and the third light source unit 23. The control unit 80 may also only control the opening (lighting) and closing (extinguishing) of the first light source unit 21, the second light source unit 22, and the third light source unit 23. In this case, the lighting fixture 100 can emit lighting light in seven light emission patterns (except for extinguishing all) formed by the combination of lighting and extinguishing of these three light source units. That is, the lighting fixture 100 can perform at least seven light performances.

The lens portion 180 has a lens 181 at a position opposite to the plurality of third light-emitting elements 23a. However, the lens portion 180 may also have a lens extending along the arrangement direction of the plurality of third light-emitting elements 23a. That is, a single lens may be disposed at a position opposite to the plurality of third light-emitting elements 23a. The lens 181 of the lens portion 180 may not be a focusing lens. The lens 181 may also be a diffusion lens that increases the light distribution angle. The type, size, and shape of the lens 181 may also be appropriately determined according to the performance or function required by the lighting device 100.

The lighting device 100 may not include the cover member 190. That is, the light emitted from the lens portion 180 may be directly used as the lighting light. The lighting device 100 may perform various light performances regardless of whether it includes the cover member 190.

The characteristic configuration of the lighting fixture 100 is applicable not only to the rectangular lighting fixture 100b shown in Modification Example 2, but also to lighting fixtures of various shapes. For example, various lighting fixtures that are polygonal, elliptical, or oblong other than rectangular when viewed from the front may have the characteristic configuration of the lighting fixture 100 (three light-transmitting components (160, 170, 180) corresponding to the three light-emitting elements (21a, 22a, 23a), etc.). The number of light-emitting elements that each of the first light source unit 21, the second light source unit 22, and the third light source unit 23 has is not particularly limited. The first light source unit 21 only needs to have at least one first light-emitting element 21a. The second light source unit 22 only needs to have at least one second light-emitting element 22a. The third light source unit 23 only needs to have at least one third light-emitting element 23a. The number of light-emitting elements of these light source parts can also be appropriately determined according to the size and shape of the three light-transmitting components (160, 170, 180), or the maximum amount of light required by the lighting device 100.

The lighting device 100 does not have to be installed on the ceiling or the like in a manner that allows for arbitrary attachment and detachment. For example, the lighting device 100 can be installed in a predetermined location in a substantially undetachable state by embedding a portion of the device body 110 into concrete or the like. In this case, various light performances can be performed according to the lighting device 100.

The light-emitting elements such as the first light-emitting element 21a of the light-emitting module 10 are SMD-type LED elements, but are not limited to this form. For example, the plurality of light-emitting elements of the light-emitting module 10 may each be an LED chip. That is, the light-emitting module 10 may also be a COB (Chip On Board) structure in which the light-emitting element, which is an LED chip, is directly mounted on the substrate 11. In this case, a plurality of LED chips mounted on the substrate 11 are sealed in batches or individually with a sealing member containing a wavelength conversion material, thereby obtaining lighting light of a predetermined color temperature.

The light-emitting elements such as the first light-emitting element 21 a of the light-emitting module 10 may also be semiconductor light-emitting elements such as semiconductor lasers, or other types of solid light-emitting elements such as EL elements such as organic EL (Electro Luminescence) or inorganic EL.

The various supplementary matters regarding the lighting fixture 100 of the embodiment described above can also be applied to the lighting fixture 100a of Modification 1 and the lighting fixture 100b of Modification 2, respectively.

In addition, the present invention includes all forms that can be obtained by various modifications that can be conceived by a person of ordinary skill in the technical field to which the above-mentioned embodiments and their modifications belong, and forms that can be achieved by arbitrarily combining the constituent elements and functions in each embodiment and its modifications within the scope of the present invention.

10,10a: light-emitting module 11: substrate 11a: main surface 21: first light source 21a: first light-emitting element 22: second light source 22a: second light-emitting element 23: third light source 23a: third light-emitting element 80: control unit 90: cable 100,100a,100b: lighting fixture 110: fixture body 110a: first body 110b: second body 111: flange 112: opening 150,150a: optical component 160,160a: first light guide plate (light-transmitting component) 161: first incident portion 164: first front surface 165,165a: first curved portion 170,170a: second light guide plate (light-transmitting member) 171: second incident portion 174: second front surface portion 175,175a: second curved portion 180,180a: lens portion (light-transmitting member) 181: lens 181a: recessed portion 190,190a,290: covering member 196,296: first covering end portion 197,297: second covering end portion

FIG. 1 is a perspective view showing the appearance of a lighting fixture of an embodiment. FIG. 2 is an exploded perspective view of a lighting fixture of an embodiment. FIG. 3 is a top view of a light-emitting module of an embodiment. FIG. 4 is a rear view of an optical component of an embodiment. FIG. 5 is a perspective view showing a cross-sectional view of a portion of an optical component of an embodiment. FIG. 6 is a cross-sectional view showing a cross-sectional view of a portion of a lighting fixture of an embodiment. FIG. 7A is a top view showing a state in which only the first light source unit is illuminated in a lighting fixture of an embodiment. FIG. 7B is a top view showing a state in which only the second light source unit is illuminated in a lighting fixture of an embodiment. FIG. 7C is a top view showing a state in which only the third light source unit is illuminated in a lighting fixture of an embodiment. FIG8 is a cross-sectional view showing a portion of the cross section of the lighting fixture of the variant 1 of the implementation form. FIG9 is a top view of the lighting fixture of the variant 2 of the implementation form. FIG10 is a cross-sectional view showing a portion of the cross section of the lighting fixture of the variant 2 of the implementation form.

10: light-emitting module 11: substrate 11a: main surface 21: first light source 21a: first light-emitting element 22: second light source 22a: second light-emitting element 23: third light source 23a: third light-emitting element 80: control unit 90: cable 100: lighting fixture 110: fixture body 110a: first body 110b: second body 111: flange 112: opening 150: optical component 160: first light guide plate (light-transmitting component) 170: second light guide plate (light-transmitting component) 180: lens portion (light-transmitting component) 181: lens 190: covering component

Claims (6)

A lighting fixture comprises: a first light emitting element and a second light emitting element, each of which emits light forward, and a third light emitting element disposed between the first light emitting element and the second light emitting element; a first light guide plate having a first incident portion for receiving light incident from the first light emitting element and emitting the light incident from the first incident portion forward; a second light guide plate having a second incident portion for receiving light incident from the second light emitting element and emitting the light incident from the second incident portion forward; and a lens portion disposed in front of the third light emitting element; a third light source portion is formed by arranging a plurality of the third light emitting elements when the lighting fixture is viewed from the front; the lens portion is formed along the third light source portion; the lens portion has a plurality of lenses corresponding to the plurality of the third light emitting elements in a one-to-one manner. The lighting fixture of claim 1, wherein, when the lighting fixture is observed from the front, (a) a first light source section is formed in an annular shape by arranging a plurality of the first light emitting elements in an annular shape, (b) a second light source section is formed in an annular shape by arranging a plurality of the second light emitting elements in an annular shape, and (c) a third light source section is formed in an annular shape by arranging a plurality of the third light emitting elements in an annular shape; the second light source section is located inside the third light source section, and the third light source section is located inside the first light source section; the first incident section of the first light guide plate is formed in an annular shape along the first light source section; the second incident section of the second light guide plate is formed in an annular shape along the second light source section; the lens section is formed in an annular shape along the third light source section. The lighting device of claim 1 or 2, wherein the first light emitting element, the second light emitting element, and the third light emitting element are arranged side by side in a transverse direction orthogonal to the front-rear direction; the first light emitting element is arranged on one side of the third light emitting element in the transverse direction; the second light emitting element is arranged on the other side of the third light emitting element in the transverse direction; the first light guide plate is arranged to extend from the first incident portion to one side of the transverse direction; the second light guide plate is arranged to extend from the second incident portion to the other side of the transverse direction. A lighting fixture comprises: a first light emitting element and a second light emitting element, each of which emits light forward, and a third light emitting element arranged between the first light emitting element and the second light emitting element; a first light guide plate having a first incident portion for receiving light incident from the first light emitting element and emitting the light incident from the first incident portion to the front; a second light guide plate having a second incident portion for receiving light incident from the second light emitting element and emitting the light incident from the second incident portion to the front; and a lens portion arranged in front of the third light emitting element; the first light emitting element, the second light emitting element, and the third light emitting element are arranged side by side in a transverse direction orthogonal to the front-rear direction; the first light emitting element is arranged on one side of the transverse direction of the third light emitting element; the second light emitting element is arranged in the The third light-emitting element is disposed on the other side of the transverse direction; the first light guide plate is disposed to extend from the first incident portion to one side of the transverse direction; the second light guide plate is disposed to extend from the second incident portion to the other side of the transverse direction; the lighting device further includes a covering member, which is arranged in front of the lens portion and has light transmittance; the first light guide plate has a light guide extending along the transverse direction. The first front surface portion of the first incident portion and the first curved portion disposed between the first incident portion and the first front surface portion; the second light guide plate has a second front surface portion extending along the transverse direction and a second curved portion disposed between the second incident portion and the second front surface portion; the covering member has a first end portion located in front of the first curved portion and a second end portion located in front of the second curved portion. As in claim 1 or 2, the lighting fixture, wherein the first light guide plate, the second light guide plate, and the lens portion are integrally provided. The lighting device of claim 1 or 2 further comprises a control unit, which controls the first light-emitting element, the second light-emitting element, and the third light-emitting element independently from each other.