JP7266232B2 - lighting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to lighting fixtures, and more particularly to lighting fixtures that use light-emitting diodes as light sources.

As a conventional example, the lighting fixture described in Patent Document 1 will be exemplified. The lighting fixture described in Patent Document 1 includes an LED (Light Emitting Diode) chip, a prism plate on which a plurality of prisms are formed on the upper surface, and a part of the light emitted from the LED chip is irradiated on the upper surface, Prepare.

International Publication No. 2013/046307

In the lighting fixture described in Patent Document 1, a plurality of prisms are formed on the incident surface of the prism plate (the surface on which the light emitted from the LED chip is incident), and the positional relationship between each prism and the LED chip is shifted. If it is put away, it is impossible to suppress unpleasant glare.

An object of the present invention is to provide a lighting fixture capable of suppressing uncomfortable glare.

A lighting fixture according to an aspect of the present invention includes a substrate, an LED module having a plurality of LEDs mounted on a surface of the substrate, and a light distribution control plate that controls the distribution of light emitted from the plurality of LEDs. a cover having a plate-shaped bottom and a peripheral wall rising from the peripheral edge of the bottom in a direction toward the LED module; A diffusion plate is provided for diffusing light incident from the first surface and emitting the light from a second surface opposite to the first surface. The light distribution control plate has a plate-shaped main body and a plurality of prisms provided on the first surface of the main body. Each of the plurality of prisms has a plurality of prism planes including a first prism plane and a second prism plane. The first prism plane constitutes a frustum surface protruding from the first surface of the main body. The second prism plane constitutes a cone surface protruding from the tip of the first prism plane. The inclination angle of the first prism plane with respect to the first surface of the body is different from the inclination angle of the second prism plane with respect to the first surface of the body. A second surface of the body opposite to the first surface of the body faces the plurality of LEDs. The second surface of the light distribution control plate faces the second surface of the diffusion plate. The light distribution control plate and the diffusion plate are attached to the peripheral wall portion of the cover. The diffusion plate is fixed to the peripheral wall portion by adhesion or welding.

The lighting fixture of the present invention has the effect of being able to suppress uncomfortable glare.

FIG. 1 is a perspective view of a lighting fixture according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of the same lighting fixture. FIG. 3 is an exploded perspective view of the light source unit in the same lighting fixture as viewed obliquely from below. FIG. 4 is an exploded perspective view of the light source unit in the same lighting fixture as viewed obliquely from above. FIG. 5 is a perspective view of part of a light distribution control plate in the same lighting fixture. FIG. 6 is a cross-sectional view of part of a light distribution control plate in the same lighting fixture. FIG. 7 is a cross-sectional view of part of the same lighting fixture. FIG. 8A is a schematic diagram showing a simulation result of an optical path of a light distribution control plate in the same lighting fixture; FIG. 8B is a schematic diagram showing a simulation result of an optical path of a comparative example of a light distribution control plate in the same lighting fixture; FIG. 8C is a schematic diagram showing another simulation result of the optical path of the light distribution control plate in the lighting fixture; FIG. 8D is a schematic diagram showing another simulation result of the optical path of the light distribution control plate of the comparative example in the above lighting fixture.

A lighting fixture according to an embodiment of the present invention will be described in detail with reference to the drawings. The lighting fixture 1 of this embodiment is an embedded lighting fixture embedded in the ceiling. However, the luminaire according to the embodiment of the present invention is not limited to the recessed luminaire, and may be, for example, a direct-mounted luminaire that is directly attached to the ceiling. Each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiment is merely an example of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made according to design and the like as long as the effects of the present invention can be achieved.

A lighting fixture 1 of this embodiment includes a light source unit 2 and a fixture body 10, as shown in FIGS. However, in the following description, unless otherwise specified, the directions indicated by the arrows in FIG.

As shown in FIG. 2, the instrument body 10 has a rectangular parallelepiped (box-shaped) housing portion 11 with an open bottom surface, and a truncated quadrangular pyramid (square tube-shaped) reflecting member 12 with open top and bottom surfaces. are doing. The housing portion 11 has a square bottom wall 110 and four rectangular side walls 111 protruding downward from four sides of the bottom wall 110 . The bottom wall 110 has a plurality of insertion holes 1100 through which power lines for power supply are inserted. The power line inserted through the insertion hole 1100 is electrically connected to the terminal block 13 attached to the lower surface of the bottom wall 110 . Further, the bottom wall 110 has a plurality of bolt insertion holes 1101 through which hanging bolts (not shown) embedded in the skeleton of the building are inserted. These plurality of bolt insertion holes 1101 are provided in the bottom wall 110 so as to be aligned in a row in the left-right direction. The bottom wall 110 and the four side walls 111 of the housing portion 11 are preferably integrally formed of a metal plate such as a steel plate.

The reflecting member 12 includes four reflecting plates 120, four fixing pieces 121 protruding upward from the upper end of each reflecting plate 120, and a frame body 122 protruding from the lower end of each reflecting plate 120 in the front-rear direction and the left-right direction. (see FIG. 2). Each reflector 120 is formed in a trapezoidal shape. Each fixed piece 121 is formed in a generally trapezoidal shape. Each fixing piece 121 is coupled to one corresponding side wall 111 of the four side walls 111 of the accommodating portion 11 . The frame 122 has a square frame shape and is connected to the lower ends of the four reflectors 120 .

3 and 4, the light source unit 2 includes two LED modules 3, a mounting member 4, a cover 5, a power supply unit 6, a light distribution control plate 20, a diffusion plate 28, and two A fixture 8 is provided.

The mounting member 4 has a square mounting plate 40 and four side plates 41 projecting downward from four sides of the mounting plate 40 . However, the mounting plate 40 and the four side plates 41 are preferably integrally formed by bending a metal plate such as a galvanized steel plate. Each of the four side plates 41 is formed in an elongated rectangular shape.

Each of the two LED modules 3 is configured by mounting a large number of LEDs 30 on the surface (lower surface) of a rectangular substrate 31 . Each LED 30 is, for example, an illumination white LED that emits white light. The plurality of LEDs 30 are arranged in a grid on the surface of the substrate 31 and electrically connected to each other via wiring conductors (copper foil) formed on the surface of the substrate 31 . A receptacle connector 32 electrically connected to each LED 30 via a wiring conductor is mounted on the surface of each substrate 31 . The receptacle connector 32 is removably connected to a plug connector connected to the output line of the power supply unit 6 . The two LED modules 3 are mounted on the lower surface of the mounting plate 40 by screws so as to be aligned in the left-right direction with a gap therebetween.

The power supply unit 6 has a power supply circuit configured by mounting electronic components on a printed wiring board 61, and a case 60 that houses the power supply circuit (see FIG. 4). The power supply circuit includes an input connector 62, a rectifier, a power factor correction circuit, a step-down DC/DC converter, an output connector 63, and the like. The input connector 62 is electrically connected to the terminal block 13 via an electric wire. The power supply circuit converts the AC power input from the input connector 62 into DC power, and then outputs the converted DC power from the output connector 63 via an electric wire (output line). DC power is supplied to each LED 30 of each LED module 3 through a plug connector and a receptacle connector 32 connected to the tip of the output line.

The printed wiring board 61 is configured by forming a wiring conductor (copper foil) on the component surface of a long rectangular flat plate-shaped insulating substrate. So-called lead parts such as an input connector 62, an output connector 63, a smoothing capacitor, and a choke coil are mounted on the surface of the printed wiring board. Then, surface-mounted components among the electronic components constituting the power supply circuit are mounted on the soldering surface of the printed wiring board. However, the input connector 62 is mounted on one longitudinal end (left end) of the printed wiring board 61 , and the output connector 63 is mounted on the other longitudinal end (right end) of the printed wiring board 61 . As shown in FIG. 4, the case 60 is made of a metal plate and has a long box shape. The case 60 accommodates the printed wiring board 61 inside such that the input connector 62 and the output connector 63 are exposed. The power supply unit 6 is screwed to the front end of the upper surface of the mounting plate 40 so that the longitudinal direction of the case 60 is aligned with the left-right direction.

The two fixtures 8 have the same configuration. Each mounting fixture 8 has a mounting spring 80 and a mounting fixture 85 for mounting the mounting spring 80 to the mounting plate 40 (see FIG. 4). The mounting spring 80 is a torsion coil spring having a coil portion 81 , two arms (a first arm portion 82 and a second arm portion 83 ), and a hooking piece 84 . The mounting bracket 85 has a flat plate-shaped base 850 , a bridge-shaped support portion 851 provided on the base 850 , and a cylindrical hook portion 852 provided on the base 850 . The support portion 851 supports the coil portion 81 so as to be rotatable about its axis. The hooking portion 852 is hooked by the hooking piece 84 of the mounting spring 80 (see FIG. 4). The mounting brackets 85 are screwed to the upper surface of the mounting plate 40 at both ends in the front-rear direction and at the center in the left-right direction (see FIG. 4). A first arm portion 82 of each mounting spring 80 protrudes outside the mounting plate 40 (see FIG. 3). A second arm portion 83 of each mounting spring 80 is hooked on a mounting bracket 85 (see FIG. 4).

The diffuser plate 28 is formed in a rectangular flat plate shape by mixing a light-transmitting synthetic resin such as an acrylic resin or a polycarbonate resin with a diffusing agent. The diffusing agent is, for example, fine particles of translucent synthetic resin such as silicone resin or acrylic resin. It should be noted that the surface of the diffusion plate 28 may be provided with a fine uneven pattern instead of being mixed with a diffusing agent.

The light distribution control plate 20 has a plate-like body portion 21 and a plurality of prisms 22 provided on the first surface (lower surface) of the body portion 21 (see FIG. 3). The main body 21 and the plurality of prisms 22 are integrally formed of translucent synthetic resin (for example, polycarbonate resin). The plurality of prisms 22 are arranged without gaps on the entire lower surface of the main body 21 (see FIGS. 5 and 6). The second surface (upper surface) of the body portion 21 is a smooth surface (smooth surface) (see FIGS. 4 and 5).

Each of the plurality of prisms 22 has four first prism planes 221 and four second prism planes 222 (see FIGS. 5 and 6). The four first prism planes 221 constitute frustum surfaces (regular truncated quadrangular pyramid surfaces) protruding from the lower surface of the main body 21 (see FIG. 5). The four second prism planes 222 form pyramidal planes (regular quadrangular pyramid planes) projecting from the tips of the first prism planes 221 (see FIG. 5). The inclination angle θ1 of the first prism plane 221 with respect to the lower surface of the main body 21 is smaller than the inclination angle θ2 of the second prism plane 222 with respect to the lower surface of the main body 21 (see FIG. 6). For example, the inclination angle θ1 of the first prism plane 221 is about 45 degrees, and the inclination angle θ2 of the second prism plane 222 is about 30 degrees. However, the respective values of these tilt angles θ1 and θ2 are not limited to 45 degrees and 30 degrees.

As shown in FIG. 4, the cover 5 has a square bottom portion 50, a peripheral wall portion 51 rising upward from the peripheral edge of the bottom portion 50, and four mounting portions 52 provided at the upper end of the peripheral wall portion 51. there is It is preferable that the bottom portion 50, the peripheral wall portion 51, and the four mounting portions 52 are integrally formed of a translucent synthetic resin material such as acrylic resin or polycarbonate resin. Moreover, it is preferable that at least the bottom portion 50 and the peripheral wall portion 51 are structured so as to diffuse light by subjecting their surfaces to texturing. Alternatively, at least the bottom portion 50 and the peripheral wall portion 51 are preferably configured to diffuse light by mixing a diffusing agent into a synthetic resin material. Each mounting portion 52 includes a rectangular protruding piece 520 protruding from the upper end of the peripheral wall portion 51 in parallel with the bottom portion 50, an engaging piece 521 formed in a hook shape and protruding upward from the upper end of the peripheral wall portion 51, and a peripheral wall. and a protrusion 522 protruding upward from the upper end of the portion 51 .

Here, the light distribution control plate 20 and the diffuser plate 28 are attached to the peripheral wall portion 51 of the cover 5 . The light distribution control plate 20 is attached to the peripheral wall portion 51 so that the lower surface of the main body portion 21 on which the prisms 22 are formed faces the bottom portion 50 . The diffuser plate 28 faces the upper surface of the body portion 21 of the light distribution control plate 20 and is attached to the peripheral wall portion 51 with a predetermined distance from the upper surface of the body portion 21 . The diffusion plate 28 and the peripheral wall portion 51 are preferably fixed to the peripheral wall portion 51 by an appropriate method such as adhesion or welding.

The cover 5 is attached to the mounting member 4 so that the peripheral wall portion 51 is accommodated inside the side plate 41 of the mounting member 4 . Here, on the mounting plate 40 of the mounting member 4, one mounting portion 42 is provided at each position corresponding to the four mounting portions 52 of the cover 5, that is, at the center of the four sides of the mounting plate 40 in the longitudinal direction. (see FIGS. 3 and 4). Each mounting portion 42 has a mounting hole 420 penetrating through the mounting plate 40 in the thickness direction, and a caulking piece 421 protruding upward from the edge of the mounting hole 420 along the side plate 41 . The engaging pieces 521 and projections 522 of each mounting portion 52 are inserted through the corresponding mounting holes 420 from the bottom to the top of the mounting plate 40 . By crimping each crimping piece 421 inward, the engaging piece 521 engages with the crimping piece 421 . That is, the cover 5 is attached to the mounting plate 40 of the mounting member 4 so that the peripheral wall portion 51 is accommodated inside the side plate 41 (see FIG. 1).

Next, the work of installing the lighting fixture 1 on the ceiling will be described. A worker who performs the construction work first inserts the power line through the insertion hole 1100 of the bottom wall 110 and then attaches the instrument body 10 to the suspension bolt by tightening a nut on the suspension bolt inserted through the bolt insertion hole 1101 . Also, the operator connects the power supply line drawn from the insertion hole 1100 to the terminal block 13 to install the device main body 10 on the ceiling.

Subsequently, the operator inserts the first arm portion 82 of the mounting spring 80 on the rear side into the insertion hole 123 provided on the fixing piece 121 on the rear side and the hooking hole 1111 provided on the side wall 111 on the rear side. After inserting the first arm portion 82 of the mounting spring 80 on the front side into the insertion hole 123 provided on the front fixing piece 121 and the hooking hole 1111 provided on the side wall 111 on the front side, the operator removes the light source unit 2 . It is lifted and stored in the storage section 11 . When the light source unit 2 is housed in the housing portion 11 , the first arm portion 82 of each mounting spring 80 is hooked on the edge of the hook hole 1111 of the side wall 111 . As a result, the light source unit 2 is supported by the fixture main body 10 by the spring forces of the two mounting springs 80 . This completes the installation work of the lighting fixture 1 .

When the two LED modules 3 are lit by the DC power supplied from the power supply unit 6 , light emitted from each LED module 3 enters the diffusion plate 28 from the first surface (upper surface) of the diffusion plate 28 . The light incident on the diffuser plate 28 is diffused by the diffusing agent of the diffuser plate 28 and emitted from the second surface (lower surface) of the diffuser plate 28 . The light diffused by diffusion plate 28 enters main body 21 from the first surface (upper surface) of main body 21 . The light incident on the body portion 21 is refracted at the interface between the first prism plane 221 and the second prism plane 222 of the plurality of prisms 22 provided on the second surface (lower surface) of the body portion 21 and the air, and the light is distributed. It is emitted from the control plate 20 . The light emitted from the light distribution control plate 20 passes through the bottom portion 50 and the peripheral wall portion 51 of the cover 5 and is irradiated to the illumination space.

Here, in a lighting fixture used for general lighting, such as the lighting fixture 1 of the present embodiment, suppression of discomfort glare is required. In the conventional example described in Patent Document 1, a plurality of prisms are formed on the upper surface (the surface on which the light emitted from the LED chip is incident), and a part of the light emitted from the LED chip is irradiated on the upper surface of the prism plate. It has In other words, the conventional example described in Patent Document 1 refracts the light emitted from the LED chip and incident on the prism, thereby narrowing the angle at which the light is emitted from the prism plate, thereby suppressing discomfort glare. However, in the conventional example described in Patent Document 1, if the positional relationship between each prism and the LED chip is displaced, the effect of suppressing discomfort glare also changes.

On the other hand, the lighting fixture 1 of the present embodiment includes a light distribution control plate 20 having a plurality of prisms 22 formed on the light exit surface (the lower surface of the main body portion 21). Furthermore, the plurality of prisms 22 have a first prism plane 221 and a second prism plane 222 having different inclination angles with respect to the output surface (lower surface) of the main body 21 . Since the lighting fixture 1 of this embodiment includes the light distribution control plate 20 as described above, discomfort glare can be suppressed regardless of the positional relationship between the prism 22 and the LEDs 30 .

Suppression of discomfort glare in the lighting fixture 1 of the present embodiment will be described below while comparing the light distribution control plate 20 of the present embodiment with the light distribution control plate 20X of the comparative example. Incidentally, in the light distribution control plate 20X of the comparative example, each of the plurality of prisms 22X is formed by four prism planes forming a single regular quadrangular pyramid.

As a method for evaluating the discomfort glare of lighting fixtures, there is the luminance limitation method (see Japanese Industrial Standard JIS C 8106). In the brightness limit method, the upper limit of the brightness value (luminance limit value) at three vertical angles (65 degrees, 75 degrees, and 85 degrees) is specified for each vertical angle according to the degree of suppression of uncomfortable glare. . Here, optical paths L1 and L2 when light is incident on the light distribution control plate 20 of the present embodiment and the light distribution control plate 20X of the comparative example from the side of the prisms 22 and 22X at an incident angle of about 75 degrees. are shown in FIGS. 8A and 8B. However, the incident angle is a vertical angle based on the second surface of the main body 21 (the surface on which the prism 22 is not formed).

In the light distribution control plate 20X of the comparative example, most of the light incident at an incident angle of 75 degrees is emitted from the second surface of the light distribution control plate 20X to the outside of the light distribution control plate 20X (see FIG. 8B). On the other hand, in the light distribution control plate 20 according to the present embodiment, most of the light incident at an incident angle of 75 degrees is totally reflected by the second surface of the body portion 21, and is reflected by the first surface of the body portion 21 on which the prisms 22 are formed. The light is emitted from the surface to the outside of the light distribution control plate 20 (see FIG. 8A). It is preferable that the second surface of main body 21 be a smooth surface (smooth surface) in order to totally reflect most of the light incident at an incident angle of 75 degrees on the second surface of main body 21 .

That is, in the light distribution control plate 20X of the comparative example, of the light incident from the second surface of the light distribution control plate 20X, the light traveling in the opposite direction along the optical path L2 in the simulation result of FIG. 8B causes discomfort glare. On the other hand, in the light distribution control plate 20 according to the present embodiment, among the light incident from the second surface of the main body 21, almost no light travels in a direction with a vertical angle (emission angle) of 75 degrees. Therefore, the light distribution control plate 20 of the present embodiment can suppress uncomfortable glare even when compared with the light distribution control plate 20X of the comparative example.

Further, when light is incident on the light distribution control plate 20 and the light distribution control plate 20X of the comparative example from the side opposite to the prisms 22 and 22X (the second surface of the main body portion 21) at an incident angle of about 75 degrees, The results of simulating the respective optical paths L3 and L4 are shown in FIGS. 8C and 8D. The output angle of each of the light path L3 of the light distribution control plate 20 in the present embodiment and the light path L4 of the light distribution control plate 20X in the comparative example is the minimum vertical angle (65 degrees ) (approximately 38 degrees). In other words, the light distribution control plate 20 in this embodiment can control the light distribution of the light emitted from the LEDs 30 that is incident at an angle that causes discomfort glare, thereby suppressing discomfort glare.

Furthermore, in the lighting fixture 1 , the light emitted from the LEDs 30 is diffused by the diffusion plate 28 and made incident on the light distribution control plate 20 . By diffusing the light emitted from the LEDs 30 with the diffuser plate 28 , the lighting fixture 1 can suppress unevenness in brightness at the bottom portion 50 of the cover 5 .

Incidentally, in order to cause total reflection on the second surface of the body portion 21, the refractive index of the medium in contact with the second surface of the body portion 21 of the light distribution control plate 20 should be higher than the refractive index of the material forming the body portion 21. must be small. Therefore, in the lighting fixture 1 of the present embodiment, a substance having a lower refractive index than that of the main body 21 exists between the second surface of the diffusion plate 28 and the second surface of the light distribution control plate 20. . Since the polycarbonate resin forming the main body 21 has a refractive index of about 1.59, air, which has a refractive index of about 1.00, is preferable as a substance having a lower refractive index than that of the main body 21 .

Moreover, in order to cause total reflection on the second surface of the body portion 21, the second surface of the body portion 21 is preferably a smooth surface (smooth surface). In the lighting device 1 of the present embodiment, by making the second surface of the main body 21 smooth (smooth surface), discomfort glare can be further suppressed.

Here, the prisms 22 of the light distribution control plate 20 in this embodiment are formed so that the inclination angle θ1 of the first prism plane 221 is larger than the inclination angle θ2 of the second prism plane 222 . As a result, the lighting fixture 1 of the present embodiment improves the mechanical strength of the prism 22 compared to the case where the inclination angle θ1 of the first prism plane 221 is smaller than the inclination angle θ2 of the second prism plane 222. be able to.

The shape of the prism 22 is not limited to a combination of a truncated quadrangular pyramid surface and a regular quadrangular pyramid surface. For example, the prism 22 may be formed in a shape that combines a truncated quadrangular pyramid surface and two or more regular quadrangular pyramid surfaces. Alternatively, the prism 22 may be formed in a shape combining a truncated triangular pyramidal surface and a triangular pyramidal surface, or in a shape combining a truncated pyramidal surface of pentagon or more and one or more pyramidal surfaces. Also, a plurality of prisms may be formed on the lower surface of the bottom portion 50 of the cover 5 . That is, the bottom portion 50 of the cover 5 and the light distribution control plate may be integrally formed.

As described above, the lighting fixture (1) according to the first aspect of the present invention comprises a substrate (31) and an LED module (3) having a plurality of LEDs (30) mounted on the surface of the substrate (31); A light distribution control plate (20) for controlling light distribution of light emitted from the plurality of LEDs (30). The light distribution control plate (20) has a plate-like main body (21) and a plurality of prisms (22) provided on the first surface of the main body (21). Each of the plurality of prisms (22) has a plurality of prism planes including a first prism plane (221) and a second prism plane (222). The first prism plane (221) constitutes a frustum surface protruding from the first surface of the main body (21). The second prism plane (222) constitutes a frustum or pyramidal plane protruding from the tip of the first prism plane (221). The inclination angle (θ1) of the first prism plane (221) with respect to the first surface of the main body (21) is different from the inclination angle (θ2) of the second prism plane (222) with respect to the first surface of the main body (21). . A second surface of the main body (21) opposite to the first surface of the main body (21) faces the plurality of LEDs (30).

The lighting fixture (1) according to the first aspect can suppress uncomfortable glare regardless of the positional relationship between the plurality of prisms (22) and the plurality of LEDs (30) of the light distribution control plate (20). can.

A lighting fixture (1) according to the second aspect of the present invention can be realized in combination with the first aspect. In the lighting fixture (1) according to the second aspect, the second surface of the main body (21) is preferably a smooth surface.

In the lighting fixture (1) according to the second aspect, since the second surface of the main body (21) is a smooth surface, discomfort glare can be further suppressed.

A lighting fixture (1) according to the third aspect of the present invention can be realized in combination with the first or second aspect. In the lighting fixture (1) according to the third aspect, the light emitted from the plurality of LEDs (30) is incident on the first surface facing the surface of the substrate (31), and the light incident from the first surface is diffused. Preferably, a diffuser plate (28) is provided to allow the light to exit from the second surface opposite the first surface. The second surface of the light distribution control plate (20) preferably faces the second surface of the diffusion plate (28).

The lighting fixture (1) according to the third aspect can suppress luminance unevenness.

A lighting fixture (1) according to the fourth aspect of the present invention can be realized by a combination with the third aspect. In the lighting fixture (1) according to the fourth aspect, between the second surface of the diffusion plate (28) and the second surface of the light distribution control plate (20), the refractive index is higher than that of the body (21). A low modulus material is preferably present.

The lighting fixture (1) according to the fourth aspect can further suppress uncomfortable glare.

A lighting fixture (1) according to the fifth aspect of the present invention can be realized by a combination with the fourth aspect. In the lighting fixture (1) according to the fifth aspect, the substance with a small refractive index is preferably air.

In the lighting fixture (1) according to the fifth aspect, since air exists between the second surface of the diffusion plate (28) and the second surface of the light distribution control plate (20), the number of parts is not increased. Discomfort glare can be further suppressed.

A lighting fixture (1) according to the sixth aspect of the present invention can be realized by combining with any one of the first to fifth aspects. In the lighting fixture (1) according to the sixth aspect, it is preferable that the inclination angle (θ1) of the first prism plane (221) is larger than the inclination angle (θ2) of the second prism plane (222).

In the lighting fixture (1) according to the sixth aspect, the prism ( 22) can be improved in mechanical strength.

REFERENCE SIGNS LIST 1 luminaire 3 LED module 20 light distribution control plate 21 main body 22 prism 28 diffusion plate 30 LED
31 substrate 221 first prism plane 222 second prism plane θ1 inclination angle of first prism plane θ2 inclination angle of second prism plane

Claims (5)

an LED module having a substrate and a plurality of LEDs mounted on a surface of the substrate;
a light distribution control plate for controlling light distribution of light emitted from the plurality of LEDs;
a cover having a plate-shaped bottom and a peripheral wall rising from the peripheral edge of the bottom in a direction toward the LED module;
Light emitted from the plurality of LEDs is incident on a first surface facing the surface of the substrate, and the light incident from the first surface is diffused and emitted from a second surface opposite to the first surface. a diffusion plate;
with
The light distribution control plate is
a plate-like main body;
and a plurality of prisms provided on the first surface of the main body,
each of the plurality of prisms has a plurality of prism planes including a first prism plane and a second prism plane;
the first prism plane constitutes a frustum surface protruding from the first surface of the main body,
the second prism plane constitutes a cone surface protruding from the tip of the first prism plane,
The inclination angle of the first prism plane with respect to the first surface of the main body is different from the inclination angle of the second prism plane with respect to the first surface of the main body,
a second surface of the main body opposite to the first surface of the main body faces the plurality of LEDs;
the second surface of the light distribution control plate faces the second surface of the diffusion plate;
The light distribution control plate and the diffusion plate are attached to the peripheral wall portion of the cover ,
The diffusion plate is fixed to the peripheral wall portion by adhesion or welding,
lighting equipment. The second surface of the main body is a smooth surface,
A lighting fixture according to claim 1 . A substance having a smaller refractive index than that of the main body is present between the second surface of the diffusion plate and the second surface of the light distribution control plate.
3. The luminaire according to claim 1 or 2 . the substance with a low refractive index is air;
4. A lighting fixture according to claim 3 . The lighting fixture according to any one of claims 1 to 4 , wherein the inclination angle of the first prism plane is greater than the inclination angle of the second prism plane .

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