JP7117585B2 - lighting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lighting fixture, and more particularly to a lighting fixture having a light source consisting of a substrate and an LED provided on the substrate.

2. Description of the Related Art Conventionally, a surface illumination light source device and a surface illumination device in which a plurality of surface illumination light source devices are arranged are known (see Patent Document 1, for example). A surface illumination light source device includes a group of light sources, a light guide, a casing that closes a surface of the light guide other than the emitting surface, and an inner reflecting means that is provided between the casing and the light guide and has a reflective surface. , and a radiation-side reflecting means having an outer reflecting portion and an aperture.

In this conventional surface illumination light source device and surface illumination device, the light (reflected light) that has passed through the radiation-side reflecting portion causes the light distribution at a position a predetermined distance away from the radiation surface to be nearly uniform. rice field.

JP-A-2009-4248

However, the surface illumination light source device and the surface illumination device described in Patent Document 1 require optical members such as the inner reflecting means and the radiation side reflecting means.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting fixture that does not require an optical member and that can suppress unevenness in luminous intensity.

In order to solve the above problems, a lighting fixture according to one embodiment of the present disclosure includes an LED module and a panel. The LED module has a substrate and a light source composed of LEDs provided on the substrate. The panel is arranged to face the substrate and has translucency to diffuse light. The substrate has a light source row in which a plurality of the light sources are arranged at a first pitch on a straight line extending in the row forming direction. A plurality of the light source rows are arranged at a second pitch in a parallel direction orthogonal to the row formation direction. Each of the light sources in one of the light source rows is arranged at a position shifted from each of the light sources of the light source row adjacent to the one of the light source rows by half the first pitch in the row formation direction.

r(θ ), find θ that satisfies r(θ)·cos θ=1/2, and set θ to ₀ . When the _first pitch is P1 and the distance between the light source and the panel is d, P1/ ₂ ≦d·tan _θ0 is satisfied.

A lighting fixture according to one embodiment of the present disclosure does not require an optical member, and can suppress unevenness in luminous intensity.

FIG. 1 is an exploded perspective view from above of a lighting fixture according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view of the same lighting fixture as viewed from below. FIG. 3 is a perspective view of the lighting fixture as viewed from below in a state in which the frame is temporarily suspended. FIG. 4 is an exploded perspective view of the light source unit in the same lighting fixture as viewed from below. FIG. 5 is a bottom view of the same light source unit. 6 is a partially enlarged view of FIG. 5. FIG. FIG. 7 is a partially enlarged view of FIG. FIG. 8 is a vertical cross-sectional view of part of the light source unit of the same.

TECHNICAL FIELD The present disclosure relates to a lighting fixture, and more particularly to a lighting fixture having a light source composed of a substrate and an LED (Light Emitting Diode) provided on the substrate. An embodiment of a lighting fixture according to the present disclosure will be described below with reference to the drawings.

The lighting fixture of this embodiment includes a light source unit 1, a fixture body 4, a frame 5, a panel 6, and a lighting device 7, as shown in FIGS. Unless otherwise specified, the vertical, front, rear, left, and right directions used in the following description are the directions defined in FIG.

As shown in FIGS. 1 to 3, the instrument body 4 has a rectangular flat top plate 40 and side plates 41 bent downward from the periphery of the top plate 40, and has a rectangular box shape with an open bottom surface. is formed in An outwardly protruding outer flange 42 is integrally formed with the side plate 41 at the lower end of each side plate 41 . A reinforcing member 420 made of a thin metal plate is attached to the central portion of the top plate 40 (see FIG. 3). A plurality of (for example, three) elongated holes 421 are provided in a row in the reinforcing member 420 . Through holes 402 are provided in the top plate 40 so as to correspond to each of the plurality of elongated holes 421 .

A ceiling material 100 to which the fixture body 4 is attached is provided with an opening 101 into which the fixture body 4 is inserted from below (see FIG. 2). A plurality of (for example, three) hanging bolts 102 are provided on the building frame above the ceiling material 100 to fix the appliance main body 4 . In fixing the fixture body 4 to the ceiling material 100, the fixture body 4 is inserted from below into the opening 101 of the ceiling material 100, the suspension bolt 102 is passed through the through hole 402 and the long hole 421, and the ceiling material 100 is fixed. The outer collar 42 is brought into contact with the peripheral edge of the opening 101 in the . In this state, when a nut is screwed into the hanging bolt 102 protruding downward from the long hole 421 , the fixture main body 4 is fixed to the ceiling material 100 .

A power terminal block 43 and a signal terminal block 44 are attached to the lower right side of the top plate 40 (see FIG. 3). Through holes 401 are provided in the top plate 40 near the power terminal block 43 and the signal terminal block 44, respectively. The power terminal block 43 is used for relay connection of power wires, and the power wires passed through the through holes 401 near the power terminal block 43 are connected to the power wires from the lighting device 7 respectively. The signal terminal block 44 is used for relay connection of signal lines, and the signal line passed through the through hole 401 near the signal terminal block 44 and the signal line from the lighting device 7 are connected respectively. That is, the lighting device 7 is supplied with commercial power (AC power) through the power terminal block 43 and receives signals such as dimming signals through the signal terminal block 44 .

Further, the left and right side plates 41 are provided with stepped portions 45 at intermediate portions in the vertical direction. The width dimension of the tool main body 4 in the left-right direction is wider at the portion below the stepped portion 45 than at the portion above the stepped portion 45 . Two holes 46 are formed in each of the left and right stepped portions 45 with a space therebetween in the front-rear direction. The hole 46 is formed from the stepped portion 45 to the side plate 41 above the stepped portion 45, into which an arm portion 81 of a fixing spring (fixing spring 8A or fixing spring 8B) described later is inserted.

The lighting device 7 is a metal printed wiring board on which a power conversion circuit that converts AC voltage/current to DC voltage/current, an input terminal block 71, two output terminal blocks 72, a signal terminal block 73, etc. are mounted. is housed in a case 70 of. The printed wiring board is formed in the shape of a rectangular plate whose longitudinal direction is the left-right direction. Two output terminal blocks 72 are mounted on the side. One end of the printed wiring board on which the input terminal block 71 and the signal terminal block 73 are mounted and the other end of the printed wiring board on which the output terminal block 72 is mounted are exposed from the case 70 .

The light source unit 1 is composed of four LED modules 2 and a reflector 3 as shown in FIGS.

The reflector 3 has a rectangular plate-shaped mounting plate 30 and four reflecting plates 31 bent downward from the periphery of the mounting plate 30, and is formed in a box shape with an open bottom surface. The reflecting plate 31 has an inner surface (a surface on the mounting plate 30 side) as a reflecting surface. In this embodiment, the reflecting surface of the reflecting plate 31 is an achromatic color such as white or gray, but is not particularly limited. As shown in FIG. 5, the reflector 31 is positioned so as to face the mounting plate 30 when viewed in a substrate orthogonal direction D3 (see FIG. 8, a direction orthogonal to the paper surface of FIG. 5) orthogonal to the column formation direction D1 and the parallel direction D2, which will be described later. arranged to surround.

An outwardly protruding outer flange 32 is integrally formed with the reflector 31 at the lower end of each reflector 31 . A case 70 of the lighting device 7 is screwed to the upper surface of the mounting plate 30 using fixing screws. The lighting device 7 is attached to the rear side of the mounting plate 30 so that the longitudinal direction of the case 70 is parallel to the left-right direction, and the input terminal block 71 and the signal terminal block 73 face rightward.

Each LED module 2 includes a rectangular substrate 20 and a light source composed of a plurality of LEDs 21 mounted on one surface (lower surface) of the substrate 20, as shown in FIGS.

The LED 21 is a commercially available packaged white LED. A plurality of lands are provided on the lower surface of the substrate 20 at predetermined intervals in the left-right direction and the front-rear direction. The plurality of LEDs 21 are mounted (surface mounted) on the lower surface of the substrate 20 by soldering electrodes to the corresponding lands.

A plurality of lands are arranged vertically and horizontally on the lower surface of the substrate 20, and a conductor foil (copper foil) for electrically connecting the lands is patterned to form a desired circuit. A receptacle connector 24 is mounted on the lower surface of the substrate 20 on the outer edge of the central portion in the width direction. The receptacle connector 24 is electrically connected to the LED 21 soldered to the land via a conductor foil formed on the substrate 20, and can be freely inserted into and removed from the plug connector connected to the output line from the lighting device 7. Connected.

In this embodiment, a conductive foil is patterned on the substrate 20 so as to connect all the LEDs 21 in series, and when the plug connector is connected to the receptacle connector 24, all the LEDs 21 are connected between the outputs of the lighting device 7. will be connected in series. The substrate 20 may be formed with a circuit in which a plurality of LEDs 21 are connected in parallel, or may be formed with a circuit in which a plurality of series circuits of a plurality of LEDs 21 are connected in parallel. . Moreover, it is not always necessary to mount the LEDs 21 on all the lands, and the LEDs 21 may be mounted by thinning out some lands.

The substrate 20 is attached to the mounting plate 30 by screws or the like. The mounting plate 30 is arranged with the LEDs 21 of the substrate 20 by mounting the substrate 20 thereon. The mounting plate 30 functions as a light source arrangement portion in which the light source composed of the LEDs 21 is arranged. As shown in FIG. 5, the mounting plate 30 as the light source arrangement portion is formed in a rectangular shape having sides along the row forming direction D1 and the parallel direction D2, which will be described later. The substrate 20 and the LEDs 21 will be detailed later.

Next, the frame 5 that holds the light source unit 1 and the panel 6 and is attached to the fixture body 4 will be described.

As shown in FIGS. 1 to 3, the frame 5 includes a bottom wall 50 having a rectangular through-hole 52 in the center and side walls 51 projecting upward from the periphery of the bottom wall 50 . An inner wall 53 is provided on the upper surface of the bottom wall 50 so as to protrude upward in parallel with the side wall 51 from a portion closer to the inside than the side wall 51 . On the upper side of the bottom wall 50, the panel 6 and the light source unit 1 are placed in an area surrounded by the inner wall 53 so as to overlap each other. The reflector 3 of the light source unit 1 is attached to the inner wall 53 of the frame 5 using the mounting bracket 35 . The mounting bracket 35 is formed by bending a metal plate into an L shape. One end of the mounting bracket 35 is screwed to the mounting plate 30 of the reflector 3, and the other end of the mounting bracket 35 is screwed to the inner wall 53. By fixing the light source unit 1 to the frame 5, the light source unit A panel 6 is held between 1 and frame 5 .

The frame 5 has a pair of inner walls 53 (frame portions) facing each other across the through hole 52. Fixing springs (consisting of fixing springs 8A and 8B) for attaching the frame 5 to the instrument main body 4 are attached in the front-rear direction. are installed two by two with an interval between them.

Each of the fixed springs 8A and 8B is formed by bending a wire rod of a metal (for example, stainless steel) having a relatively high elastic modulus.

In this embodiment, the central portion 80 of the fixed spring 8A is attached to the left inner wall 53 via the connecting fitting 54, and the central portion 80 of the fixing spring 8B is attached to the right inner wall 53 via the connecting fitting 54. .

The panel 6 has translucency and is formed in a rectangular flat plate shape from a synthetic resin (for example, acrylic resin) mixed with a diffusion material for diffusing light. However, the vertical and horizontal dimensions of the panel 6 are configured to be larger than the vertical and horizontal dimensions of the through holes 52 and smaller than the distance between the inner walls 53 . The panel 6 is housed inside the inner wall 53 and placed on a portion of the bottom wall 50 inside the inner wall 53 to close the through hole 52 (see FIGS. 1 and 2). The light source unit 1 is placed on the panel 6 placed on the bottom wall 50 , and the reflector 3 of the light source unit 1 is fixed to the frame 5 using the mounting bracket 35 so that the panel 6 can be attached to the light source unit 1 . and frame 5. The panel 6 is arranged so as to face the substrate 20 .

Each part of the lighting fixture of this embodiment has the above-mentioned structure, and the procedure of attaching this lighting fixture to the ceiling material 100 is demonstrated based on FIG.

The operator inserts the appliance main body 4 into the opening 101 of the ceiling material 100 from below, and attaches the appliance main body 4 to the hanging bolt 102 while the upper surface of the outer flange 42 is in contact with the peripheral edge of the opening 101 . fixed. Inside the fixture main body 4, a power line and a signal line pre-wired on the back side of the ceiling material 100 are introduced through a through hole 401, and the operator connects the power line to the power terminal block 43 and connects the signal Connect the wires to the signal terminal block 44 .

The frame 5 to which the panel 6 and the light source unit 1 are attached is attached to the fixture main body 4 attached to the ceiling material 100 in this way.

A worker holds the arm portions 81 of the two fixing springs 8B attached to the right side of the frame 5, and bends the arm portions 81 in a direction in which the tip sides of the pair of arm portions 81 provided for each fixing spring 8B approach each other. The tip of the portion 81 is inserted into the corresponding hole 46 of the instrument body 4 and the end is hooked on the periphery of the hole 46 . As a result, the frame 5 is suspended from the device main body 4 by the two fixing springs 8B attached to the inner wall 53 on the right side.

Next, the operator lifts the lower side of the frame 5 upward from the state shown in FIG. 4 holes 46 in order. The operator bends the pair of arms 81 of each fixing spring 8A toward each other, inserts the tips of the arms 81 into the holes 46 on the left side of the instrument body 4, and hooks the ends to the rim of the holes 46. . As a result, the frame 5 is suspended by the fixing springs 8A and 8B on both sides.

When an operator pushes up the frame 5 from this state, the pair of arms 81 provided by the fixing springs 8A and 8B expand outward due to their elastic force, and the spring force of the fixing springs 8A and 8B causes the frame 5 to move upward. is pulled upwards. Then, the upper end of the side wall 51 comes into contact with the lower surface of the ceiling material 100 and the frame 5 is attached to the lower surface of the ceiling material 100 . Thus, the lighting fixture of this embodiment is attached to the ceiling material 100 .

The arrangement of the LEDs 21 provided on the substrate 20 will be described below. As shown in FIG. 5, in the present embodiment, a first substrate 201 and a second substrate 202 are arranged side by side as the substrate 20 on the mounting plate 30 serving as the light source arrangement portion.

The substrate 20 has a plurality of light source rows L (L11-L18, L21-L28). As shown in FIG. 6, each light source row L is configured by arranging a plurality of LEDs 21 on a straight line extending in the row forming direction D1 along the plate surface of the substrate 20 at a _first pitch P1. That is, in each light source row L (L11 to L18, L21 to L28), the pitch between any two LEDs 21 adjacent in the row formation direction D1 is the _first pitch P1.

The light source rows L are arranged at a _second pitch P2 in a parallel direction D2 along the surface of the substrate 20 and orthogonal to the row formation direction D1. That is, the pitch between any two light source rows L adjacent in the parallel direction D2 is the _second pitch P2.

Each LED 21 in the light source row L11 is arranged at a position shifted by half the _first pitch P1 in the row formation direction D1 from each LED 21 in the light source row L12 adjacent to the light source row L11. Similarly, each LED 21 in the light source row L12 is arranged at a position shifted by half the _first pitch P1 in the row formation direction D1 from each LED 21 in the light source row L13 adjacent to the light source row L12. That is, each LED 21 in one light source row L (L11 to L18, L21 to L28) is separated from each LED 21 in the light source row L adjacent to one light source row L at half the _first pitch P1 in the row formation direction D1. It is arranged at a position shifted by pitch.

Further, as shown in FIG. 7, a light source row L18 positioned at the end of the first substrate 201 on the second substrate 202 side, and a light source row L21 positioned at the end of the second substrate 202 on the first substrate 201 side. is equal to the _second pitch P2. That is, the pitch in the parallel direction D2 between the light source array L18 and the light source array L21 is equal to the _second pitch P2.

Accordingly, although the substrate 20 is divided into the first substrate 201 and the second substrate 202, the LEDs 21 arranged on the substrate 20 have a common _first pitch P1 in the row forming direction D1. Also, the pitch in the parallel direction D2 of the light source arrays L is common to the _second pitch P2. Also, each LED 21 in one light source row L is arranged at a position shifted by half the _first pitch P1 in the row formation direction D1 from each LED 21 in the light source row L adjacent to this light source row L. become common.

Next, the conditions that the pitch of adjacent LEDs 21 should satisfy will be described. First, the conditions that the _first pitch P1 should satisfy as the pitch of the adjacent LEDs 21 will be described.

First, the directivity of LED21 is demonstrated. As shown in FIG. 8, the LEDs 21 in one light source row L are designated as LED211, LED212, LED213, . A direction orthogonal to the row formation direction D1 and the parallel direction D2 is defined as a substrate orthogonal direction D3. In any of the LEDs 21 (here, LED 213), the luminous intensity (intensity) of the light emitted from the LED 213 in the direction perpendicular to the substrate D3, and the luminous intensity of the light emitted in the direction inclined at an angle θ from the direction perpendicular to the substrate D3. Let the ratio be r(θ). Since the luminous intensity attenuates in inverse proportion to the square of the distance from the LED 213 regardless of the angle θ, the comparison is made at the same distance.

Specifically, let I(0) be the luminous intensity of the light emitted from the LED 213 in the direction D3 perpendicular to the substrate and reaching the point Q1 on the surface of the panel 6 which is the distance d away from the LED 213 . Further, let I(θ) be the luminous intensity of the light emitted from the LED 213 in a direction inclined at an angle θ and reaching the point Q2 on the surface of the panel 6 . Although the distance from the LED 213 to the point Q1 is different from the distance from the LED 213 to the point Q2, the effect of this distance difference is not considered in this description as it is not significant.

At this time,
r(θ)=I(θ)/I(0) (Formula 1)
becomes. In general, including this embodiment, I(θ) and r(θ) decrease as θ increases from 0.

Moreover, LED21 used as LED21 in this embodiment becomes r((theta))=cos(theta).

Light reaching the surface of panel 6 (points Q1 and Q2) is diffused by panel 6 . Among them, the ratio of the light irradiated in the substrate orthogonal direction D3 through the panel 6 is the ratio of the component in the substrate orthogonal direction D3 to the light reaching the surface of the panel 6 (points Q1 and Q2).

Specifically, the luminous intensity of light reaching point Q1 on the surface of panel 6 is I(0). Of these, the substrate orthogonal direction D3 direction component I _D3 (0) is
I _D3 (0)=I(0)·cos0=I(0) (Formula 2)
This is the luminous intensity of the light that passes through the panel 6 from the point Q1 and reaches the point Q3 shifted in the substrate orthogonal direction D3.

Also, the luminous intensity of the light reaching the point Q2 on the surface of the panel 6 is I(θ). Of these, the substrate orthogonal direction D3 direction component I _D3 (θ) is
I _D3 (θ)=I(θ)·cos θ (Formula 3)
This is the luminous intensity of the light that passes through the panel 6 from the point Q2 and reaches the point Q4 shifted in the substrate orthogonal direction D3.

As described above, when viewing the light emitted in the direction D3 perpendicular to the substrate through the panel 6, the luminous intensity of the light emitted in the direction D3 perpendicular to the substrate from the LED 213 is the luminous intensity I _D3 ( 0) and I(0). Further, when viewing the light emitted in the direction D3 perpendicular to the substrate through the panel 6, the luminous intensity of the light emitted from the LED 213 in the direction inclined at an angle θ with respect to the direction D3 perpendicular to the substrate is the light reaching the point Q4. is the luminous intensity I _D3 (θ) of , and is I(θ)·cos θ. Therefore, the ratio R(θ) of the luminous intensity I _D3 (θ) of the light reaching the point Q4 to the luminous intensity I _D3 (0) of the light reaching the point Q3 is
R(θ)=I(θ)·cos θ/I(0)=r(θ)·cos θ (Formula 4)
becomes. In this embodiment, since r(θ)=cos θ,
R(θ)=cos ² θ (Formula 4-1)
becomes.

Next, the ratio of the luminous intensity at the midpoint between the adjacent LEDs 21 to the luminous intensity at the position of the LED 21 when viewed in the substrate orthogonal direction D3 will be described. Specifically, it is the ratio of the luminous intensity at point Q5 between LED 211 and LED 212 to the luminous intensity at point Q3.

here,
θ ₁ =tan ⁻¹ (P ₁ /2d) (Formula 5)
is. The luminous intensity at the point Q5 is the luminous intensity of the light emitted from the LED 211 in a direction inclined by an angle θ ₁ with respect to the substrate orthogonal direction D3, and the luminous intensity of the light emitted from the LED 212 in a direction inclined by an angle θ ₁ with respect to the substrate orthogonal direction D3. is the sum of the luminous intensities of the light Strictly speaking, the luminous intensity of the light from the LED 21 other than the LEDs 211 and 212 should also be added, but the effect of this luminous intensity is not considered in this description as it is not significant.

In this case, the luminous intensity I _Q5 at the point Q5 is I _Q5 =2·I(θ ₁ )·cos θ ₁ (Formula 6) using (Formula 3)
becomes.

Also, the luminous intensity at the position of the LED 21 when viewed in the substrate orthogonal direction D3 is the luminous intensity at the point Q3, which is I(0) as shown in (Equation 2).

Here, as a condition for the unevenness of the luminous intensity of the lighting equipment to be small, when the panel 6 is viewed in the board orthogonal direction D3, the luminous intensity at the midpoint between the adjacent LEDs 21 must not fall below the luminous intensity at the position of the LEDs 21. can be specified. That is, the condition for small unevenness in luminous intensity is defined that the luminous intensity _IQ5 at the point _Q5 is not smaller than the luminous intensity at the position of the LED 21, that is, the luminous intensity ID3(0) at the point Q3.

In this case, assuming that the angle θ that is the limit that satisfies the condition is angle θ ₀ ,
I _Q5 =2·I(θ ₀ )·cos θ ₀ =I(0) (Equation 7)
must be satisfied. By transforming the formula from (Formula 7),
2·I(θ ₀ )·cos θ ₀ =I(0)
I(θ ₀ )/I(0)·cos θ ₀ = 1/2
From (Formula 1),
r(θ ₀ )·cos θ ₀ =1/2 (Formula 8)
θ ₀ that satisfies is the desired solution. In this embodiment, r(θ)=cos θ, so θ ₀ =45°.

In this case, similarly to (Equation 5),
θ ₀ =tan ⁻¹ (P ₁ /2d) (Formula 9)
Therefore, rewrite P ₁ /2=d·tan θ ₀ (Equation 10)
get

If the angle θ ₁ at the point Q5 is equal to or less than θ ₀ , I _Q5 ≧I(0) from (Eq. do not have. That is, if P ₁ /2≦d·tan θ ₀ is satisfied, the luminous intensity at the midpoint between the adjacent LEDs 21 does not fall below the luminous intensity at the position of the LEDs 21 . Further in other words, when the _first pitch P1 is 2d·tan θ ₀ or less, the luminous intensity at the midpoint between the adjacent LEDs 21 does not fall below the luminous intensity at the position of the LEDs 21 . By doing so, it is possible to suppress the occurrence of unevenness in luminous intensity in the row formation direction D1.

The same applies not only to the _first pitch P1 in the light source row L, but also to two LEDs 21 located in different light source rows L. FIG. As shown in FIG. 6, let P3 be the pitch between the LEDs 21 forming the light source line L11 and the LEDs 21 forming the light source line L12 that are shifted from the LEDs 21 by P ₁ / ₂ in the line formation direction D1. If P ₃ ≦2d·tan θ ₀ for the pitch P ₃ , the luminous intensity at the midpoint between these two LEDs 21 does not fall below the luminous intensity at the position of the LED 21 . Now, from the Pythagorean theorem,
P ₃ = {(P ₁ /2) ² +P ₂ ² } ^1/2 (Formula 11)
is. By doing so, it is possible to suppress the occurrence of unevenness in luminous intensity in the parallel direction D2.

In addition, it is preferable that the luminous intensity at the end of the light source arrangement portion, that is, the position of the reflector 31 as viewed in the direction D3 perpendicular to the substrate does not fall significantly below the luminous intensity at the position of the LED 21 . Specifically, it is preferable that the luminous intensity at the position of the reflector 31 does not fall below 1/2 of the luminous intensity at the position of the LED 21 closest to the reflector 31 when viewed in the substrate orthogonal direction D3. When the luminous intensity at the position of the reflector 31 is half the luminous intensity at the position of the LED 21 closest to the reflector 31, the angle θ is _θ0 . Here, as shown in FIG. 6, if the distance between the reflector 31 and the LED 21 closest to the reflector 31 is D, then
D≦d·tan θ ₀ (Formula 12)
When satisfying By doing so, it is possible to suppress the occurrence of unevenness in luminous intensity at the end of the light source arrangement portion.

Instead of diffusing light with a diffusing material, the panel 6 may be textured or the like on the surface of the panel 6 to form a diffusing portion that looks milky white or the like, and the form of diffusing light is not limited.

Further, the LEDs 21 do not have to be arranged strictly in a straight line in the light source row L. In other words, the LEDs 21 forming the light source row L may be arranged slightly deviated from the straight line as long as the effect intended in the present disclosure can be obtained.

As is clear from the first embodiment described above, the lighting fixture of the first aspect includes the LED module 2 and the panel 6 . The LED module 2 has a light source composed of a substrate 20 and an LED 21 provided on the substrate 20 . The panel 6 is arranged so as to face the substrate 20 and has translucency to diffuse light. The substrate 20 has a light source row L in which a plurality of light sources are arranged at a _first pitch P1 on a straight line extending in the row formation direction D1. A plurality of light source rows L are arranged at a _second pitch P2 in a parallel direction D2 orthogonal to the row forming direction D1. Each light source in one light source row L is arranged at a position shifted by half the _first pitch P1 in the row formation direction D1 from each light source in the light source row L adjacent to one light source row L.

r(θ ), find θ that satisfies r(θ)·cos θ=1/2, and set θ to ₀ . The first pitch P ₁ and the distance d between the light source and the panel 6 satisfy P ₁ / ₂ ≦d·tan θ0.

According to the first aspect, it is possible to suppress the occurrence of unevenness in luminous intensity in the row formation direction D1.

The second aspect is realized by a combination with the first aspect. In the second aspect, the lighting fixture satisfies {(P ₁ /2) ² +P ₂ ² } ^1/2 /2≦d·tan θ ₀ when the second pitch is P ₂ .

According to the second aspect, it is possible to suppress the occurrence of unevenness in luminous intensity in the parallel direction D2.

The third aspect is realized by a combination with the first aspect or the second aspect. In a third aspect, the luminaire further comprises a reflector 3 . The reflector 3 has a light source placement portion and a reflector 31 . The light source arrangement portion is formed in a rectangular shape having sides along the row formation direction D1 and the parallel direction D2, and the light source rows L are arranged. The reflector 31 is arranged so as to surround the light source arrangement portion when viewed in a substrate orthogonal direction D3 orthogonal to the column formation direction D1 and the parallel direction D2. When the distance between the reflector 31 and the light source closest to the reflector 31 is D, D≦d·tan _θ0 is satisfied.

According to the third aspect, it is possible to suppress unevenness in luminous intensity at the end of the light source arrangement portion.

The fourth aspect is realized by a combination with any one of the first to third aspects. In the fourth aspect, the first substrate 201 and the second substrate 202 as the substrates 20 are arranged in the light source arrangement portion in the parallel direction D2. The pitch between the light source row L18 located at the end of the first substrate 201 on the second substrate 202 side and the light source row L21 located at the end of the second substrate 202 on the first substrate 201 side is the _second pitch P2. equal. Each light source in the light source row L18 located at the end of the first substrate 201 on the second substrate 202 side is aligned with each light source in the light source row L21 located at the end of the second substrate 202 on the first substrate 201 side. They are arranged at positions shifted by half the _first pitch P1 in the direction D1.

According to the fourth aspect, even if the substrate 20 is divided into the first substrate 201 and the second substrate 202, the same luminous intensity as when the substrate 20 is not divided can be obtained.

The fifth aspect is realized by a combination with the third aspect. In the fifth aspect, the reflector 31 has an achromatic reflective surface facing the light source placement section.

According to the fifth aspect, unevenness in luminous intensity is less noticeable.

2 LED module 20 substrate 201 first substrate 202 second substrate 21 LED (light source)
3 reflector 30 mounting plate (light source placement part)
31 reflector 6 panel d distance D1 row formation direction D2 parallel direction D3 substrate orthogonal direction L light source row L18 light source row L21 light source row P1 _first pitch P2 _second pitch θ angle

Claims (5)

an LED module having a substrate and a light source composed of LEDs provided on the substrate;
a panel arranged to face the substrate and having translucency to diffuse light;
The substrate has a light source row in which a plurality of the light sources are arranged at a first pitch on a straight line extending in the row formation direction,
A plurality of the light source rows are arranged at a second pitch in a parallel direction orthogonal to the row formation direction,
each of the light sources in one of the light source rows is arranged at a position shifted by half the first pitch in the row formation direction from each of the light sources of the light source row adjacent to the one of the light source rows,
r(θ )year,
Find θ that satisfies r(θ)·cos θ=1/2 and set θ to ₀ ,
Let the _first pitch be P1,
When the distance between the light source and the panel is d,
A lighting fixture that satisfies P ₁ /2≦d·tan θ ₀ . When the _second pitch is P2,
{(P ₁ /2) ² +P ₂ ² } ^1/2 /2≦d·tan θ ₀ is satisfied
A lighting fixture according to claim 1 . further comprising a reflector,
The reflector is formed in a rectangular shape having sides along the row forming direction and the parallel direction, and has a light source arrangement portion in which the light source rows are arranged, and a substrate orthogonal direction orthogonal to the row forming direction and the parallel direction. a reflector arranged so as to surround the light source arrangement portion when viewed from above,
When the distance between the reflector and the light source closest to the reflector is D,
satisfies D≦d·tan θ ₀
The luminaire according to claim 1 or 2. further comprising a reflector,
The reflector is formed in a rectangular shape having sides along the row formation direction and the parallel direction, and has a light source placement portion in which the row of light sources is arranged, and a substrate orthogonal direction orthogonal to the row formation direction and the parallel direction. and a reflector arranged to surround the light source arrangement portion when viewed from above,
a first substrate and a second substrate as the substrates are arranged in the light source placement portion so as to be aligned in the parallel direction;
The pitch between the light source array positioned at the end of the first substrate on the second substrate side and the light source array positioned on the end of the second substrate on the first substrate side is equal to the second pitch. ,
each of the light sources in the light source row positioned at the end of the first substrate on the second substrate side, each of the light sources in the light source row positioned at the end of the second substrate on the first substrate side; arranged at a position shifted by half the first pitch in the row formation direction
A lighting fixture according to any one of claims 1 to 3. The lighting fixture according to claim 3, wherein the reflecting plate has an achromatic reflecting surface facing the light source arrangement portion.

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