JP5957766B2 - Light emitting unit and lighting fixture - Google Patents

Description

  The present invention relates to a light emitting unit including a light emitting element such as an LED (Light Emitting Diode) as a light source, and a lighting fixture including the light emitting unit, and particularly relates to a technique for suppressing color unevenness of emitted light.

  In recent years, lighting fixtures using a light emitting unit including a light emitting element such as an LED (Light Emitting Diode) as a light source are becoming widespread. On the other hand, since the size of the lighting fixture varies depending on the application, there are demands for light emitting units of various sizes. Therefore, it is conceivable to adopt a configuration in which a plurality of subunits each including a substrate and a plurality of light emitting elements are arranged as a configuration of a large light emitting unit. If it is this structure, after manufacturing a subunit with a small manufacturing apparatus, a some light emitting unit can be manufactured by assembling a plurality of subunits. Therefore, it is not necessary to use a large manufacturing apparatus, and manufacturing is simple.

  For example, Patent Document 1 proposes a lighting fixture including a light emitting unit in which four subunits are arranged. As shown in FIG. 7, the light emitting unit 1010 includes four subunits 1013 each including a substrate 1011 and linear light sources 1012a and 1012b. The substrate 1011 is formed in a quadrant arc shape. The linear light sources 1012a and 1012b are formed by arranging the light emitting elements 1012 in two rows along the alignment direction.

JP 2012-146441 A

  By the way, in a lighting fixture provided with the said conventional light emission unit, there exists a method of providing a lens in the light emission direction side of a light emission unit as a method of diffusing the emitted light from a linear light source around the light emission unit. As the lens, lenses having various shapes that allow the light emitted from the light emitting unit to spread can be considered. One example is a lens having a shape in which a portion facing a linear light source is raised to a convex shape. When a lens having this shape is used, the light emitted from the light emitting unit diffuses in a direction opposite to the substrate and in a direction perpendicular to the direction in which the linear light source and the lens extend, but the direction opposite to the substrate, Moreover, it is difficult to diffuse in the extending direction of the linear light source and the lens. For this reason, in a lighting fixture, when there is a region where no light emitting element exists along the alignment direction of the linear light sources, the emitted light from the linear light sources is difficult to diffuse and may become dark.

  In the conventional light emitting unit, it is difficult to position the linear light source at the connection portion that is a portion where the first subunit and the second subunit are joined together. This is because it is necessary to secure an insulation distance at the edge of the substrate of the first subunit and the second subunit. If the linear light source is not positioned at the connection portion of the light emitting unit, the connection portion may be darker than other portions of the light emitting unit. That is, there is a possibility that luminance unevenness occurs in the light emitting unit.

  In view of the above-described problems, an object of the present invention is to provide a light-emitting unit that has a configuration in which a first subunit and a second subunit are arranged and suppresses uneven luminance.

  In order to achieve the above object, a light-emitting unit according to one embodiment of the present invention includes a first subunit and a second sub-unit each including at least two linear light sources each including a substrate and a plurality of light-emitting elements arranged in a line. The unit is a light emitting unit arranged in a state where one end of the first subunit and one end of the second subunit are brought into contact with each other, and one end edge of the substrate of the first subunit is outward. A first portion that is continuously extended and a second portion that is retracted more inwardly, and an end edge that is aligned with the first subunit of the substrate of the second subunit is connected to the first portion. A length corresponding to the retraction length of the second part and the third part retracted inward by the length corresponding to the extended length of the first part and the second part. And a fourth part that continues to the outside, and the front On the first portion of the substrate of the first sub-unit, at least one linear light source of said at least two or more linear light sources are arranged, characterized in that.

  In the light-emitting unit according to one embodiment of the present invention, the first portion of the substrate of the first subunit fits in the third portion of the substrate of the second subunit. Moreover, the linear light source is arrange | positioned on the 1st site | part of the board | substrate of a 1st subunit. Thereby, the emitted light from the linear light source on the first part is diffused in a direction orthogonal to the direction in which the linear light source extends and opposite to the substrate, for example, by a lens provided in the light emitting direction. The Thereby, it can suppress that it becomes dark in the connection part of the light emission unit which is a connection part which is the part which joined the 1st subunit and the 2nd subunit. And it can suppress that a brightness nonuniformity arises in a light emitting unit.

  Thus, according to one embodiment of the present invention, a light-emitting unit that has a structure in which the first subunit and the second subunit are arranged, and luminance unevenness is suppressed can be provided.

It is a figure which shows the light emission unit which concerns on embodiment, (a) is a perspective view which shows the whole light emission unit, (b) is a top view which shows the subunit which comprises a light emission unit. It is a disassembled perspective view of the lighting fixture provided with the light emission unit shown in FIG. It is a disassembled perspective view of the lighting fixture except the cover among the lighting fixtures shown in FIG. It is a figure explaining the emitted light from the lighting fixture shown in FIG. 2, Comprising: (a) This invention is shown, (b) A comparative example is shown. It is a top view of the light emitting unit concerning a modification. It is a top view of the light emitting unit concerning a modification. It is a top view of the light emission unit which concerns on a prior art example.

<< Embodiment >>
1. Configuration of Light-Emitting Unit A lighting fixture according to one embodiment of the present invention will be described with reference to the drawings. In addition, the scale of the member in each drawing differs from an actual thing. Moreover, the sign “˜” used when indicating a numerical range includes numerical values at both ends thereof. Furthermore, here, a mode in which an LED (Light Emitting Diode) is used as a light emitting element will be described. In addition, the scale between each member is not necessarily unified in all figures including FIG. 1 and FIG.

FIG. 1 is a diagram illustrating a light emitting unit according to an embodiment. FIG. 1A is a perspective view showing the entire light emitting unit. FIG. 1B is a plan view showing subunits constituting the light emitting unit. Hereinafter, the first subunit 13a and the second subunit 13b are collectively referred to as the subunit 13 when there is no need for distinction.
(overall structure)
As shown in FIG. 1, the light emitting unit 10 is formed by combining four quadrant arc-shaped subunits 13 in an annular shape. The light emitting unit 10 includes two first subunits 13a and two second subunits 13b, with one end of the first subunit 13a and one end of the second subunit 13b aligned. Hereinafter, the part where the subunits 13 meet is referred to as a connection part 10 a of the light emitting unit 10.

Each subunit 13 includes a substrate 11, a first linear light source 12a, a second linear light source 12b, and a third linear light source 12c. In the light emitting unit 10, the shape and area of each subunit 13 are equal. Therefore, all the subunits 13 constituting the light emitting unit 10 can be continuously manufactured by the same manufacturing apparatus.
(substrate)
The substrate 11 is a plate formed so as to have an arc shape when seen in a plan view, and is arranged at one end edge of the arrangement direction of the subunits 13 in the substrate 11 (hereinafter referred to as “alignment direction” at the end) from the outside. It has a projecting portion 11a that is continuously extended, and a portion that is more retracted inward, which is a portion excluding the projecting portion 11a. Moreover, the board | substrate 11 has the accommodating part 11b retracted | saved more inward to the other end edge of the arrangement direction, and the part which continued more outwards which is a part except the accommodating part 11b. The storage portion 11b is retracted inward by a length corresponding to the extended length of the protruding portion 11a. Further, the protruding portion 11a is continuously extended outward by a length corresponding to the retracted length of the storage portion 11b. That is, the storage portion 11b is shaped so that the protruding portion 11a can be accommodated. Furthermore, in the connection part 10a, the protrusion part 11a fits in the storage part 11b.

The board | substrate 11 consists of insulating materials, such as ceramics and heat conductive resin, for example. The substrate 11 may be made of a conductive material such as aluminum. When the substrate 11 is viewed in plan, as shown in FIG. 1B, the area of the storage portion 11b is larger than the area of the protruding portion 11a. Thereby, since the through-hole 10b is formed in each connection part 10a, the light emitting unit 10 has a total of four through-holes 10b in the connection part 10a. For example, wiring from a lighting circuit for lighting the light emitting unit 10 can be drawn through the through hole 10b.
(Linear light source)
On each board | substrate 11, the 1st linear light source 12a, the 2nd linear light source 12b, and the 3rd linear light source 12c are arrange | positioned along the said row direction. Hereinafter, when there is no need to distinguish the first linear light source 12a, the second linear light source 12b, and the third linear light source 12c, they are referred to as “linear light sources 12”. A part of the first linear light source 12a is located on the protruding portion 11a.

Each of the linear light sources 12 is formed by arranging a plurality of LEDs 12d along the alignment direction. Further, the LEDs 12d are arranged with their respective light emitting directions facing away from the substrate 11. The LED 12d is an LED package composed of one or a plurality of white LED chips and a resin material made of a phosphor or the like. The LED 12d is mounted on the substrate 11 by a mounting method that can ensure conductivity such as soldering. The number of LEDs 12d may be determined according to the luminance required for the light emitting unit 10. The LEDs 12d constituting each linear light source 12 are electrically connected by a wiring pattern.
2. By the way, although the light emission unit 10 may be used independently, it is common to use it incorporating in a lighting fixture. Hereinafter, a ceiling light is illustrated as a lighting fixture provided with the light emission unit 10, and it demonstrates using FIG. The lighting fixture according to the present invention is not limited to a ceiling light. For example, the lighting fixture for buildings other than ceiling lights, such as a downlight, may be sufficient, and lighting fixtures other than building lighting fixtures, such as a backlight, may be sufficient.
(overall structure)
2 is an exploded perspective view of a lighting fixture including the light emitting unit shown in FIG. FIG. 3 is an exploded perspective view of the lighting fixture with the cover removed from the lighting fixture shown in FIG. 2.

  As shown in FIG. 2, the lighting fixture 1 includes, for example, a light emitting unit 2 including a light emitting unit 10, a power supply unit 8 including a power supply unit that supplies power to the light emitting unit 10, a protective cover, and the like. A main body 9 a that supports the portion 8, and a cover 3 that covers one of the main bodies 2 a including the light emitting unit 2. The luminaire 1 is attached to the ceiling, for example, with the main body 2a facing the ceiling. In addition, the luminaire 1 is driven by being fed from a commercial power outlet.

The cover 3 is formed in a bottomed cylindrical shape that covers the light emitting unit 2. The cover 3 is made of a translucent material such as silicone resin, acrylic resin, polycarbonate resin, or glass. The inner surface of the cover 3 is subjected to a diffusion process for diffusing light emitted from the light emitting unit 2 as a light source, for example, a diffusion process using silica, white pigment, or the like. Light emitted from the light emitting unit 2 passes through the cover 3 and is taken out of the lighting fixture 1. The detailed configuration of the light emitting unit 2 will be described later with reference to FIG. The main body 2a is made of a metal material such as aluminum or iron pressed into a disk shape, and has a through hole in the center.
(Each component configuration)
As illustrated in FIG. 3, the lighting fixture 1 includes a center lens 5, a center light emitting unit 6, a lens 7, a power supply unit 8, a main body unit 9 a, a light emitting unit 10, and the like. By providing the center light emitting unit 6 as a light source in the central region and providing the light emitting unit 10 as a light source in a region other than the central region, the luminance unevenness of the luminaire 1 is suppressed. The light emitting unit 10 is sandwiched between the lens 7 and the main body 2a, and is fixed by screws through screw holes provided on the inner and outer periphery of the lens 7. Three receivers 8 a fix the cover 3.

The center lens 5 diffuses light emitted from the center light emitting unit 6. The center lens 5 is made of a translucent material such as acrylic resin, polycarbonate resin, or glass. The center light emitting unit 6 includes an annular substrate 6a and LEDs 6d arranged circumferentially.
The lens 7 diffuses light emitted from the light emitting unit 10. The diffusion direction of the emitted light by the lens 7 is, for example, a direction orthogonal to the row direction when a row light source is used. The lens 5 is made of a translucent material such as acrylic resin, polycarbonate resin, or glass. As described above, the light emitting unit 10 includes the subunits 13 arranged side by side.

  The power supply unit 8 includes a control block 8b and a power supply block 8c mounted on an insulating plate 8d, a protective cover 8e made of metal, and the like. The control block 8b is configured by housing a control board in a case. The control board and the power supply block 8c are connected by a tape electric wire. For example, the control block 8b receives a lighting signal and a non-lighting signal output from a remote controller that can be operated by the user, and outputs a control signal to the power supply block 8c. The power supply block 8c includes a substrate and various electronic components mounted on the substrate. The power supply block 8c includes a circuit that converts the supplied alternating current into a desired direct current. The protective cover 8e is a member that houses the mounted power supply block 8c and control block 8b. A mounting through hole is formed in the central portion of the protective cover 8e. An adapter (not shown) for attaching the lighting fixture 1 to a wiring fixture installed on the ceiling or the like is fitted into the through hole for attachment formed in the protective cover 8e. Moreover, the lighting fixture 1 is fixed to a ceiling etc. via the said adapter. The power supply line 8f drawn from the power supply block 8c is connected to a power supply outlet through the through hole of the protective cover 8e and the through hole 4a of the main body 2a.

The main body 9a is made of a translucent material such as acrylic resin, polycarbonate resin, or glass. The main body 9 a is a cover provided for protecting a light emitting unit (not shown) attached to the outer peripheral surface of the power supply unit 8 and for light diffusion of the light emitting unit.
3. Light Emitted from Light-Emitting Unit Hereinafter, light emitted from the light-emitting unit 10 will be described with reference to FIG. FIG. 4 is a diagram for explaining the light emitted from the light emitting unit shown in FIG. FIG. 4A shows the present invention, and FIG. 4B shows a comparative example. As described above, the main diffusion direction of the emitted light by the lens 7 is a direction orthogonal to the extending direction of the linear light source in the direction along the substrate, for example, when a linear light source is used. Further, in practice, the light emitting unit is formed by arranging four subunits, but in the drawing, only a portion where two subunits are arranged is shown.

  As shown in FIG. 4B, the light emitting unit 910 is formed by arranging subunits 913 including a substrate 911 and a linear light source 12 together. Here, an area where the linear light source 12 is not located is present in the central portion of the connection portion 910a in the light emitting unit 910 when viewed in the arrangement direction. Here, when the lens 7 is provided on the emission direction side, the emitted light from the linear light source 12 is likely to diffuse in the direction indicated by the arrow L1 which is a direction orthogonal to the extending direction of the linear light source 12. On the other hand, when the lens 7 is provided on the emission direction side, the emission light from the linear light source 12 is not easily emitted in the direction indicated by the arrow L2 that is the direction in which the linear light source 12 extends. Therefore, the light emitted from the linear light source 12 is not easily diffused at the central portion of the connection portion 910a in the light emitting unit 910. As a result, the central portion of the connection portion 910a in the light emitting unit 910 becomes dark. This may cause uneven brightness in the light emitting unit 910.

  On the other hand, as shown in FIG. 4A, in the connection portion 10a in the light emitting unit 10, the protruding portion 11a in the substrate 11 of the first subunit 13a is accommodated in the storage portion 11b in the substrate 11 of the second subunit 13b. Yes. A part of the linear light source 12a is located on the protruding portion 11a. Here, the emitted light from the linear light source 12 is likely to diffuse in the direction indicated by the arrow L1 which is a direction orthogonal to the extending direction of the linear light source 12. On the other hand, the light emitted from the linear light source 12 is unlikely to be emitted in the direction indicated by the arrow L2, which is the direction in which the linear light source 12 extends. As a result, it can suppress that the center part of the connection part 10a of the light emission unit 10 becomes dark. Thereby, it can suppress that a brightness nonuniformity arises in the light emission unit 10. FIG.

Thus, in this invention, it is the structure which puts the 1st subunit and the 2nd subunit side by side, Comprising: The light emission unit 10 which suppressed the brightness nonuniformity can be provided.
<< Modification >>
Below, the modification of the light emission unit which concerns on this invention is demonstrated using FIG. The light emitting unit according to the modification differs from the above embodiment in the shape of the substrate, the number of light emitting element rows, and the arrangement of the light emitting element rows. In addition, about a modification, only the difference of both is demonstrated and description is abbreviate | omitted using the same code | symbol about a common structure. 5 and 6 are plan views of a light emitting unit according to a modification.
1. The light emitting unit in which the area of the storage portion and the area of the protruding portion are the same As shown in FIG. 5A, in the light emitting unit 110, the shape and area of the storage portion 111b and the shape and area of the protruding portion 111a are the same. is there. Therefore, the protrusion 111a on the substrate 111 of the first subunit 113a is accommodated in the storage portion 111b on the substrate 111 of the second subunit 113b without any gap. With this configuration, when the light emitting unit 110 is manufactured, when the four subunits 113 are connected, the positional deviation in the direction orthogonal to the arrangement direction can be suppressed. This is because, when the four subunits 113 are connected, if the protruding portion 111a is caught on the edge surrounding the storage portion 111b in the connecting portion 110a of the light emitting unit 110, the protruding portion 111a further moves in the orthogonal direction. It is because it does not. In this case, for example, the wiring may be drawn out by providing a through hole outside the substrate.
2. Application to Rectangular Light Emitting Unit As shown in FIG. 5B, the light emitting unit 210 may be rectangular. The substrate 211 in the first subunit 213a and the second subunit 213b is rectangular, and has a protruding portion 211a and a storage portion 211b at one end edge. The protruding portion 211a on the substrate 211 of the first subunit 213a is accommodated in the storage portion 211b on the substrate 211 of the second subunit 213b without any gap. The same applies to the storage portion 211b of the second subunit 213a and the protruding portion 211a of the second subunit 213b. The first linear light source 212a in the first subunit 213a is located on the first protrusion 211a. The second linear light source 212b in the second subunit 213b is located on the first protrusion 211a. Thus, the shape of the light emitting unit is not limited to an annular shape, and may be, for example, a rectangular shape. Furthermore, the number of linear light sources is not limited to two or three, but may be at least two or more.
3. Diagonal Cut Subunit As shown in FIG. 6A, the edge of the substrate 311 may have a shape that is cut obliquely. That is, the one end edge 311a of the substrate 311 of the first subunit 313a is formed obliquely with respect to the arrangement direction, which is formed by connecting a portion that is extended more outward and a portion that is more retracted toward the outside. Straight edge. Similarly, the edge 311b that is aligned with the first subunit 313a of the substrate 311 of the second subunit 313b is formed by connecting a portion that protrudes more outward and a portion that retreats more toward the outside. The first end unit 313a is a linear end edge parallel to the one end edge 311a of the substrate 311. The first linear light source 312a, the second linear light source 312b, and the third linear light source 313c are arranged along the alignment direction. When a straight line perpendicular to the alignment direction is drawn from the end of the first linear light source 12a of the first subunit 311a on the one end edge 311a side, the straight line has an intersection with the one end edge 311b of the second subunit 313b.
4). Position of Projection and Storage Unit As shown in FIG. 6B, the first subunit 413 a has one projection 411 a at the center of one end edge of the substrate 411. The second subunit 413b has one storage portion 411b at the center of one end edge aligned with the first subunit 413a in the substrate 411. Even in this configuration, the protruding portion 411a on the substrate 411 of the first subunit 413a fits in the storage portion 411b on the substrate 411 of the second subunit 413b without any gap. In the first subunit 413a, the second linear light source 12b is positioned on the protruding portion 411a. Further, with this configuration, when the light emitting unit 410 is manufactured, when the four subunits 413 are connected, it is possible to suppress a positional shift in a direction orthogonal to the arrangement direction.
5. Others While the configuration of the lighting fixture according to the present invention has been described based on the embodiment and the modification, the present invention is not limited to the embodiment and the modification. For example, the structure which combined suitably the partial structure of the said embodiment and its modification may be sufficient. In addition, the materials, numerical values, and the like described in the above embodiments are merely preferable examples and are not limited thereto. Furthermore, it is possible to appropriately change the configuration without departing from the scope of the technical idea of the present invention.
(Board shape)
In the embodiment and the like, both ends of the substrate have the same shape. However, the present invention is not limited to this, and both end edges of the substrate may have different shapes. Moreover, although the one end edge of the board | substrate had one protrusion part, it is not restricted to this. One end edge of the substrate may have a plurality of protrusions. In this case, the other end edge of the substrate adjacent to the substrate may have one or a plurality of storage portions.
(Sub unit and light emitting unit)
In the above embodiment and the like, the shape of the light emitting unit is an annular shape or a linear shape. However, the shape of the light emitting unit is not limited to this, and may be another shape such as an elliptical ring shape or a polygonal line shape. When the shape of the light emitting unit is elliptical, for example, each subunit may have a different shape. The shape of the subunit may be, for example, a polygonal shape in addition to the rectangular shape.
(Linear light source arrangement)
In the above-described embodiment and the like, the one end edge of the substrate of the first subunit has a first part that is extended more outward and a second part that is more retracted inward. In addition, the one end edge aligned with the first subunit of the substrate of the second subunit is aligned with the first portion, and the third portion is retracted inward by a length corresponding to the continuous length of the first portion. And a fourth part that is arranged in the second part and continues outwardly by a length corresponding to the retracted length of the second part. Here, not only in the above-described embodiment, but in this configuration, for example, even if a linear light source is arranged on the first part, uneven luminance can be suppressed. In addition, in the configuration in which the linear light source is arranged on the first part and the linear light source is arranged on the fourth part as in the above-described embodiment, the luminance unevenness can be further suppressed.
(Light emitting element)
The light emitting element according to the present invention is not limited to an LED. As a light emitting element, LD (laser diode) and EL element (electric luminescence element) may be used, for example. Further, the light emitting element according to the present invention may be not only an SMD (Surface Mount Device) type but also a COB (Chip On Board) type.
(Other)
The luminaire according to the present invention can be widely used in general lighting applications such as a ceiling light, a downlight, and a backlight.

DESCRIPTION OF SYMBOLS 1 Light-emitting fixture 10 Light-emitting unit 11 Board | substrate 11a Protrusion part 11b Storage part 12a 1st linear light source 12b 2nd linear light source 12c 3rd linear light source 12d LED
13 subunit 13a first subunit 13b second subunit

Claims (8)

A first subunit and a second subunit each provided with at least two linear light sources each having a substrate and a plurality of light emitting elements arranged in a line are formed with one end of the first subunit and one end of the second subunit. Light emitting units arranged in a state where
One end edge of the substrate of the first subunit has a first portion that is continuously extended outward, and a second portion that is retracted more inward,
One end edge of the substrate of the second subunit that is aligned with the first subunit is aligned with the first portion and retracted inward by a length corresponding to the extended length of the first portion. 3 parts and a fourth part arranged in the second part and extending outwards by a length corresponding to the retracted length of the second part,
On the first portion of the substrate of the first subunit, at least one linear light source among the at least two linear light sources is disposed.
A light emitting unit characterized by that. The first part and the fourth part are convex,
In the portion where the first subunit and the second subunit are brought together, the first part fits in the third part, and the fourth part fits in the second part,
The at least two or more linear light sources are arranged along the arrangement direction.
The light-emitting unit according to claim 1. When the substrates in the first subunit and the second subunit are viewed in plan view,
The area of the third part is larger than the area of the first part,
The area of the second part is larger than the area of the fourth part,
The light-emitting unit according to claim 2. When the substrates in the first subunit and the second subunit are viewed in plan view,
The area of the third part is the same as the area of the first part;
The area of the second part is the same as the area of the fourth part.
The light-emitting unit according to claim 2. When the substrates in the first subunit and the second subunit are viewed in plan view,
The shape and area of the substrate of the first subunit are the same as the shape and area of the substrate of the second subunit, respectively.
The light-emitting unit according to claim 2. The light emitting unit according to claim 2 is provided,
Covers at least part of the light emitting unit and diffuses light emitted from the at least two linear light sources in a direction perpendicular to the extending direction of the at least two linear light sources in the direction along the substrate. A lens to
A cover covering the lens;
Comprising
A lighting apparatus characterized by that. At least one linear light source among the at least two linear light sources is disposed on a fourth portion of the substrate of the second subunit.
The light-emitting unit according to claim 1. One end edge of the substrate of the first subunit is an edge that is formed by connecting the first part and the second part, and is obliquely linear with respect to the arrangement direction,
One end edge of the second subunit substrate, which is aligned with the first subunit, is formed by connecting the third portion and the fourth portion to one end edge of the first subunit substrate. Parallel straight edges,
When a straight line orthogonal to the arrangement direction is drawn from an end of the linear light source arranged in the first subunit on the one end edge side, the straight line has an intersection with the one end edge of the second subunit.
The light-emitting unit according to claim 1.

Images