JP2019016509A - Lighting fixture - Google Patents

Abstract

To provide a lighting fixture which includes a substrate on which a plurality of LED elements are arranged, and in which color unevenness of light emitted from the lighting fixture is suppressed.SOLUTION: A lighting fixture 1 includes: a fixture body 10; a light source substrate 21 mounted on the fixture body 10; and a plurality of LED elements 22 arranged side by side in an annular manner on the light source substrate 21. Each of the plurality of LED elements 22 has an LED light source 24 and a wavelength conversion material 26a, and emits synthetic light generated by blue light emitted by the LED light source 24 and yellow light which is the light after conversion of the blue light by the wavelength conversion material 26a being synthesized. In each of the plurality of LED elements 22, the ratio of the yellow light included in the synthetic light emitted in an A axis direction is larger than the ratio of the yellow light included in the synthetic light emitted in a B axis direction. Each of the plurality of LED elements 22 is arranged on the light source substrate 21 in a posture so that the A axis direction is not orthogonal to the direction in which the plurality of LED elements 22 are arranged.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a lighting fixture including a substrate on which a plurality of LED elements are arranged.

  Conventionally, as an example of a lighting fixture, a ceiling light installed on a ceiling is known. For example, Patent Literature 1 discloses an instrument body, a substrate supported by the instrument body, a light emitting element disposed on the main surface of the substrate, a light source cover that covers the light emitting element, and a light source cover that is attached to the instrument body. There is disclosed a ceiling light including an outer cover having a light diffusion property to cover. In this ceiling light, at least a part of the outer peripheral end portion of the light source cover exists at a position beyond the substrate. This makes it easier for light emitted from the outer cover to reach the area on the ceiling side than the main surface of the substrate.

JP 2017-1112071 A

  When a plurality of light emitting elements are arranged on an annular substrate in plan view as in the above conventional ceiling light, since there is no light source in the central area, for example, the amount of light in the central area of the ceiling light is It becomes smaller than the amount of light in the peripheral area surrounding the central area. That is, when looking up at the ceiling light, the central region is a relatively dark region, and therefore, the difference between the emission color in the central region and the emission color in the peripheral region may be conspicuous.

  In view of the above-described conventional problems, the present invention provides a luminaire including a substrate on which a plurality of LED elements are arranged, in which unevenness of light emitted from the luminaire is suppressed. Objective.

  In order to achieve the above object, a lighting fixture according to one embodiment of the present invention includes a fixture main body, a substrate attached to the fixture main body, and a plurality of light emitting diodes (LEDs) arranged in a ring shape on the substrate. ), Each of the plurality of LED elements has an LED light source and a wavelength conversion material, and the first light emitted from the LED light source and the wavelength of the first light converted by the wavelength conversion material Of the second light contained in the synthesized light that is emitted in a predetermined direction by emitting the synthesized light generated by the synthesis of the second light having a color different from that of the first light. Is larger than the ratio of the second light contained in the combined light emitted in the other direction, and is arranged on the substrate in a posture in which the predetermined direction is not orthogonal to the arrangement direction of the plurality of LED elements.

  According to the lighting fixture which concerns on this invention, the board | substrate with which several LED element was arrange | positioned is provided, and the color nonuniformity of the light discharge | released from a lighting fixture can be suppressed.

It is a perspective view of the lighting fixture which concerns on embodiment. It is a disassembled perspective view of the lighting fixture which concerns on embodiment. It is a top view which shows the instrument main body and light emitting module which concern on embodiment. It is a top view which shows the structure of the LED element which concerns on embodiment. It is a schematic diagram showing the deviation of the luminescent color in the LED element which concerns on embodiment. It is a top view which shows the arrangement layout of the some LED element in the light source substrate which concerns on embodiment. It is an enlarged view for demonstrating the attitude | position in planar view of the LED element which concerns on embodiment. It is sectional drawing which shows the structural example of the several lens part with which the light source cover which concerns on embodiment is provided.

  Below, the lighting fixture which concerns on embodiment of this invention is demonstrated in detail using drawing. The embodiment described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement and connection forms of constituent elements, processes, order of processes, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Therefore, for example, the scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code | symbol is attached | subjected about the substantially same structure, and the overlapping description may be abbreviate | omitted or simplified.

  Hereinafter, in this specification, “front” is the main light emitting direction of the lighting fixture (light emitting module), and “rear” is the direction opposite to “front”.

  In the present specification and drawings, the x axis, the y axis, and the z axis indicate the three axes of the three-dimensional orthogonal coordinate system. In the embodiment, the z-axis direction is the vertical direction (up-down direction), and the direction perpendicular to the z-axis (the direction parallel to the xy plane) is the horizontal direction. In addition, the positive direction of the z-axis is vertically downward. In addition, these matters do not limit the posture at the time of use of the lighting fixture according to the present invention.

  In the following embodiments and claims, expressions indicating relative directions or postures, such as parallel and orthogonal, may be used. Strictly speaking, these expressions are those directions or postures. Including cases that are not. For example, two directions being orthogonal do not only mean that the two directions are completely orthogonal, but also being substantially orthogonal, that is, for example, a difference of about several percent. Is also included.

(Embodiment)
[Outline of lighting equipment]
First, the outline | summary of the lighting fixture 1 which concerns on embodiment is demonstrated using FIG.1 and FIG.2.

  FIG. 1 is a perspective view of a lighting fixture 1 according to an embodiment. FIG. 2 is an exploded perspective view of the lighting fixture 1 according to the embodiment.

  The lighting fixture 1 shown by FIG.1 and FIG.2 is installed in the construction material of buildings, such as a house, for example. As an example, the lighting fixture 1 is a ceiling light fixed to the ceiling of a building, and illuminates a space inside the building. Specifically, the luminaire 1 is installed on the ceiling by being attached to a hook ceiling body (not shown) fixed to the ceiling.

  In each figure, the negative side of the z axis is the ceiling side, and the positive side of the z axis is the floor side. That is, in FIG.1 and FIG.2, the lighting fixture 1 is shown in the posture upside down from the posture at the time of normal use.

  As shown in FIGS. 1 and 2, the lighting fixture 1 includes a fixture body 10, a light emitting module 20, a light source cover 30, a cover 40, and a power supply circuit 70. The power supply circuit 70 is provided in the lighting fixture 1 in a state of being housed in a circuit cover 75 fixed to the fixture body 10.

  The light emitting module 20 emits light by the electric power supplied from the power supply circuit 70. The light emitted from the light emitting module 20 passes through the light source cover 30 and the cover 40 and is emitted to the outside of the lighting fixture 1.

  Next, with reference to FIGS. 1 and 2, each component of the lighting fixture 1 will be described in detail with reference to FIGS. 3 to 7.

[Equipment body]
FIG. 3 is a plan view showing the instrument body 10 and the light emitting module 20 according to the embodiment. As shown in FIGS. 2 and 3, the instrument body 10 is a member that supports the light emitting module 20. The instrument body 10 has a placement surface 11 on which the light emitting module 20 is placed so as to emit light forward, and holds a power supply circuit 70 behind.

  More specifically, the instrument body 10 includes a placement surface 11, a peripheral edge portion 13, and a through hole 14 as shown in FIGS. 2 and 3. The shape of the instrument body 10 in a plan view (when viewed from the positive side of the z-axis) is a disc shape (that is, an annular shape) in which a through hole 14 is provided in the center. In the instrument body 10, the mounting surface 11 is provided in an annular shape over the entire circumference of the through hole 14 so as to surround the through hole 14. Moreover, the peripheral part 13 is provided over the perimeter so that the mounting surface 11 may be enclosed. An adapter (not shown) for attaching to the hooking sealing body is inserted into the central through hole 14.

  The mounting surface 11 is a main surface on the floor side when the instrument body 10 is installed on the ceiling, and is a surface to which the light emitting module 20 is attached. As shown in FIG. 2, the mounting surface 11 is positioned forward (on the positive side of the z axis) with respect to the peripheral edge portion 13 provided annularly along the outer periphery thereof. As a result, a space for accommodating the power supply circuit 70 is provided on the opposite side of the placement surface 11.

  The instrument main body 10 is produced by, for example, pressing a sheet metal such as an aluminum plate or a steel plate. One surface (the surface including the mounting surface 11) of the instrument body 10 may be coated with a white paint in order to enhance reflectivity and improve light extraction efficiency, or a reflective metal material. May be deposited.

[cover]
The cover 40 is a translucent cover having translucency, and is also called, for example, a “glove”. As shown in FIGS. 1 and 2, the cover 40 is an outer cover that forms an outer shell of the lighting fixture 1. The cover 40 covers the light emitting module 20 and the light source cover 30 by being disposed on the front side of the instrument body 10. In the present embodiment, the cover 40 has a gently curved surface (light emitting surface) formed so that the center protrudes forward.

  The cover 40 transmits light emitted from the LED element 22. Specifically, the cover 40 transmits the light emitted from the LED element 22 and passed through the light source cover 30.

  The cover 40 is formed using a resin material having translucency. The material of the cover 40 is, for example, acrylic (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), or polyvinyl chloride.

  The cover 40 may have light diffusibility (light scattering). Thereby, the light incident on the cover 40 can be diffused (scattered), and the light can be extracted from the entire cover 40 substantially uniformly. In this case, the cover 40 is, for example, milky white and can be formed of a resin material in which light diffusion particles are dispersed. Further, a milky white light diffusion film may be formed on the inner surface or the outer surface of the cover 40, and a plurality of light diffusion dots or minute irregularities (textures) may be formed on the cover 40.

  The cover 40 is detachably attached to the instrument body 10. Although the attachment method is not particularly limited, for example, the cover 40 is fixed so as to be caught by a locking portion provided at the peripheral portion of the instrument body 10.

[Light source cover]
The light source cover 30 is a cover member having translucency. As shown in FIGS. 2 and 3, the light source cover 30 is attached to the instrument body 10 so as to cover the light emitting module 20. In the present embodiment, the light source cover 30 is fixed to the placement surface 11 of the instrument body 10 using screws (not shown).

  The light source cover 30 is formed using a resin material having translucency. The material of the light source cover 30 is, for example, PMMA, PC, PET, or polyvinyl chloride.

  For example, the light source cover 30 has a function of protecting the light emitting module 20 from foreign matters such as external dust, protecting the light emitting module 20 from being touched by a person, and controlling and transmitting light emitted from the light emitting module 20.

  More specifically, the light source cover 30 has a plurality of lens portions 31. The plurality of lens portions 31 are provided in one-to-one correspondence with the plurality of LED elements 22 included in the light emitting module 20. For example, the lens unit 31 expands the light distribution angle of light from the corresponding LED element 22. That is, the lens unit 31 has a function of diverging light. In this way, by arranging the lens portions 31 corresponding to the individual LED elements 22, for example, a part of the light from each of the plurality of LED elements 22 is efficiently placed in a central region where no light source exists in a plan view. Can be directed. The effects of the plurality of lens units 31 will be described later with reference to FIG.

[Power supply circuit]
The power supply circuit 70 is a power supply device for generating power for lighting the light emitting module 20. The power supply circuit 70 converts, for example, AC power supplied from an external power supply such as a system power supply or a storage battery via a hooking sealing body and an adapter (not shown) to DC power and supplies the DC power to the light emitting module 20.

  Specifically, the power supply circuit 70 controls lighting (full lighting) and extinguishing of the light emitting module 20. The power supply circuit 70 may perform light adjustment or color adjustment of the light emitting module 20.

  The power supply circuit 70 includes, for example, a circuit board and a plurality of circuit elements mounted on the circuit board. Each of the plurality of circuit elements is, for example, a rectifier circuit element, a detection resistor, a fuse element, a resistor, a capacitor, a choke coil, a diode, or a transistor. The circuit cover 75 that accommodates the power supply circuit 70 is fixed to the opposite side of the mounting surface 11 of the instrument main body 10 using screws, so that the power supply circuit 70 is attached to the instrument main body 10.

[Light emitting module]
The light emitting module 20 is a light emitting unit attached to the fixture body 10 of the lighting fixture 1 and emits light of a predetermined color (wavelength) such as white. In the present embodiment, the light emitting module 20 is configured to emit white light.

  As shown in FIGS. 2 and 3, the light emitting module 20 includes a light source substrate 21 and a plurality of LED elements 22. In the present embodiment, the light source substrate 21 is configured by connecting four separate substrates arranged in an annular shape. For convenience of explanation, a set of these four substrates is used. The body is treated as a single light source substrate 21. Note that the number of substrates constituting the light source substrate 21 is not necessarily four, and may be any of 1 to 3, or 5 or more.

  The light source substrate 21 is a mounting substrate on which a plurality of LED elements 22 are mounted. The light source substrate 21 is, for example, a printed wiring board, and a metal wiring pattern is formed in a predetermined shape on one surface of the light source substrate 21. As shown in FIG. 2, the light source substrate 21 is placed on the placement surface 11 of the instrument body 10 such that the plurality of LED elements 22 face the floor surface side. That is, the light emitting module 20 is attached to the instrument body 10 in a posture in which light is emitted forward. Specifically, the light source substrate 21 is fixed to the mounting surface 11 of the instrument body 10 using a plurality of screws (not shown).

  The light source substrate 21 is formed in an annular shape in plan view. That is, the light emitting module 20 is formed in an annular shape when viewed from the front.

  The light source substrate 21 is, for example, a resin substrate made of an insulating resin material, a metal base substrate made of a metal material whose surface is coated with a resin, a ceramic substrate that is a sintered body of a ceramic material, or a glass substrate made of a glass material. It is. The light source substrate 21 is not limited to a rigid substrate, and may be a flexible substrate. A resist film may be formed as an insulating film on the surface of the light source substrate 21 so as to cover the metal wiring.

  In addition, the LED element 22 according to the present embodiment is a surface mount device (SMD) type LED element.

  FIG. 4 is a plan view showing the configuration of the LED element 22 according to the embodiment. As shown in FIG. 4, the LED element 22 includes a container 23, an LED light source 24 accommodated in the container 23, and a wavelength conversion material 26 a that converts the wavelength of light from the LED light source 24. In the present embodiment, the LED light source 24 includes two LED chips 25.

  The container 23 is a member made of resin, for example, and in the present embodiment, the shape in plan view is a rectangle having a first side 23a and a second side 23b that are orthogonal to each other. In the central portion of the container 23, a concave portion for accommodating the LED light source 24 and the wavelength conversion layer 26 including the wavelength conversion material 26a is formed.

  Note that the A axis in FIG. 4 is an axis parallel to the first side 23a, and the B axis is an axis parallel to the second side 23b. These matters regarding the A-axis and the B-axis also apply to FIGS. 5 and 7 described later.

  In the present embodiment, for example, a blue LED chip that emits blue light is employed as the LED chip 25. As the blue LED chip, for example, a gallium nitride based semiconductor light emitting element having a central wavelength of 440 nm to 470 nm, which is made of an InGaN based material, is employed.

  The wavelength conversion material 26a is phosphor particles in the present embodiment, and is provided in the LED element 22 as the wavelength conversion layer 26 including the phosphor particles and the translucent resin material 26b.

  The wavelength conversion layer 26 having the wavelength conversion material 26a is disposed so as to cover the two LED chips 25 constituting the LED light source 24, and the wavelength (color) of the light emitted from the LED chip 25 is converted by the wavelength conversion material 26a. Is done. Examples of such a wavelength conversion layer 26 include an insulating resin material (phosphor-containing resin) containing phosphor particles. The phosphor particles are excited by light emitted from the LED chip 25 and emit light of a desired color (wavelength).

  As the translucent resin material 26b constituting the wavelength conversion layer 26, for example, a silicone resin is used. The wavelength conversion layer 26 may contain a light diffusing material such as silica. Note that the wavelength conversion layer 26 is not necessarily formed of a resin material, and may be formed of an inorganic material such as a low-melting glass or a sol-gel glass in addition to an organic material such as a fluorine-based resin.

  Examples of the phosphor particles to be contained in the wavelength conversion layer 26 as the wavelength conversion material 26a include, for example, YAG-based yellow phosphor particles in order to obtain white light using light emitted from the LED chip 25 that is a blue LED chip. Adopted.

  Thereby, part of the blue light emitted from the LED chip 25 is converted into yellow light by the yellow phosphor particles that are the wavelength conversion material 26 a included in the wavelength conversion layer 26. Then, the blue light that has not been absorbed by the yellow phosphor particles and the yellow light obtained by the wavelength conversion by the yellow phosphor particles are synthesized, and synthesized light (mainly white light in this example) from the wavelength conversion layer 26. And emitted.

  The blue light emitted from the LED chip 25 is an example of the first light, and the yellow light that is the light after the wavelength conversion material 26a converts the wavelength of the blue light is an example of the second light.

  In the present embodiment, the two LED chips 25 included in the LED element 22 are handled as one LED light source 24 included in the LED element 22, but each of the two LED chips 25 includes one LED element 22. One LED light source 24 may be treated. That is, the LED light source 24 included in the LED element 22 is realized by one or more LED chips 25.

  Here, as in the case of the LED element 22 described above, when light of a color different from the emission color of the LED chip is generated and emitted by the combination of the LED chip and the wavelength conversion material, the observed emission color is biased. There is a case. That is, for example, in a plan view, a uniform light color may not be obtained in all directions with the LED element as the center. Specifically, the LED element 22 according to the present embodiment has a light distribution characteristic as shown in FIG.

  FIG. 5 is a schematic diagram showing the deviation of the emission color in the LED element 22 according to the embodiment. In FIG. 5, the yellow density measured or observed is schematically represented by the density of the dots.

  In the LED element 22 according to the embodiment, as shown in FIG. 5, the combined light emitted in the A-axis direction (both directions parallel to the A-axis) appears relatively yellow, and the B-axis direction (B-axis) In the combined light emitted in both directions parallel to the yellow, yellow appears faint or no yellow appears. In short, the LED element 22 emits yellowish light in the A-axis direction and emits whitish light in the B-axis direction.

  That is, in the LED element 22, the ratio of yellow light included in the combined light emitted in the A-axis direction is larger than the ratio of yellow light included in the combined light emitted in the other direction (B-axis direction in FIG. 5). .

  Here, the proportion of yellow light included in the synthesized light quantitatively corresponds to, for example, yellow light with respect to the total area Sa between the graph and the horizontal axis (wavelength axis) in the spectral distribution shown in FIG. It is calculated | required as a ratio of area Sy. The lateral width of the area Sy is defined by a yellow wavelength band (for example, 570 nm to 590 nm). Further, the magnitude of the proportion of yellow light contained in the synthesized light may be determined using, for example, an actual measurement value using a measuring device, or may be determined visually by a person. For any of the LED elements 22 according to the present embodiment, the proportion of yellow light included in the combined light emitted in the A-axis direction is emitted in the B-axis direction, which is one of the other directions, by any method. It can be determined that the ratio is larger than the proportion of yellow light contained in the combined light.

  As one factor that causes such light distribution characteristics, for example, the optical path length of the light emitted from the LED chip 25 in the wavelength conversion layer 26 may be different between the A-axis direction and the B-axis direction.

  Specifically, when the LED element 22 is viewed in plan, the length La from the LED light source 24 to the end of the wavelength conversion layer 26 in the A-axis direction is from the LED light source 24 to the end of the wavelength conversion layer 26 in the B-axis direction. It is larger than the length Lb. In the present embodiment, the surface of the wavelength conversion layer 26 (front surface in FIG. 4) is flat, and the magnitude relationship between La and Lb is approximately the A-axis direction of the blue light emitted from the LED light source 24. This coincides with the magnitude relationship between the passage length of the wavelength conversion layer 26 and the passage length of the wavelength conversion layer 26 in the B-axis direction of the blue light emitted from the LED light source 24.

  In other words, the length of the blue light emitted from the LED light source 24 in the A-axis direction that passes through the wavelength conversion layer 26 is the length that the blue light passes through the wavelength conversion layer 26 in the other direction (the B-axis direction in the present embodiment). Longer than you want. As a result, of the blue light emitted from the LED light source 24 in the A-axis direction, the amount of light that is wavelength-converted by the wavelength conversion material 26a becomes relatively large, and as a result, the combined light that the LED element 22 emits in the A-axis direction. The yellow appears relatively dark. In addition, the blue light emitted from the LED light source 24 in the B-axis direction has a relatively small amount of light that is wavelength-converted by the wavelength conversion material 26a. As a result, the combined light emitted from the LED element 22 in the B-axis direction Yellow is less likely to appear (not noticeable).

  In addition to the difference in the optical path length depending on the above direction, the light distribution characteristic is caused by the fact that the width of the LED light source 24 in the A-axis direction is larger than the width in the B-axis direction. It is also conceivable that the amount of blue light emitted is greater than the amount of blue light emitted in the A-axis direction. It is also conceivable that the shape of the container 23 affects the light distribution characteristics of the LED element 22.

  As described above, the LED element 22 according to the present embodiment has the light distribution characteristic that the emission color is uneven.

  The inventors of the present application pay attention to the fact that the LED element 22 has the above-mentioned light distribution characteristics, and the orientation (posture) of the LED element 22 in plan view affects the color unevenness of the light emitted from the lighting fixture 1. I found out.

  Hereinafter, the attitude | positions, etc. of the several LED element 22 in the lighting fixture 1 which concerns on embodiment are demonstrated using FIG.6 and FIG.7.

[Attitude of LED element]
FIG. 6 is a plan view showing an arrangement layout of the plurality of LED elements 22 in the light source substrate 21 according to the embodiment. FIG. 7 is an enlarged view for explaining the posture of the LED element 22 according to the embodiment in plan view.

  In the lighting fixture 1 according to the present embodiment, the LED elements 22 having the light distribution characteristics as described above are arranged in multiple rings as shown in FIG. Specifically, a plurality of LED elements 22 are arranged along a plurality of concentric circles centered on the center point P in plan view.

  In the light emitting module 20 having the plurality of LED elements 22 arranged side by side in this manner, there is no light source in the central region. Therefore, from the central portion of the cover 40 (see FIG. 2) (the portion facing the central region), a set of light directed to the central region among the light emitted from each of the plurality of LED elements 22 is emitted from the central region as illumination light. Released.

  Therefore, for example, when each of the plurality of LED elements 22 is arranged in a posture in which the A-axis direction is directed to the direction of the center point P in a plan view, the combined light (hereinafter referred to as “yellow” that appears relatively dark). White light ") collects from each LED element 22 in the central region. As a result, the central portion of the cover 40 appears yellower than the outer peripheral edge portion of the central portion. Moreover, it can be said that the center part of the cover 40 is a part which opposes the center area | region where the light source does not exist in the light emitting module 20, and is the part which the collected yellowish white light is conspicuous.

  Therefore, in the lighting fixture 1 according to the present embodiment, each of the plurality of LED elements 22 is disposed on the light source substrate 21 in a posture in which the A-axis direction is not directed to the center point P in plan view.

  Specifically, when attention is paid to the plurality of LED elements 22 arranged along the innermost circumference C among the plurality of LED elements 22 arranged in a multiple ring shape, the posture of these LED elements 22 is This will be explained as follows.

  That is, as shown in FIG. 7, each of the plurality of LED elements 22 is arranged on the light source substrate 21 in a posture in which the arrangement direction of the plurality of LED elements 22 (tangential direction of the circumference C) and the A-axis direction are not orthogonal to each other. Has been. More specifically, each of the plurality of LED elements 22 is disposed on the light source substrate 21 in a posture in which the arrangement direction of the plurality of LED elements 22 (tangential direction of the circumference C) and the A-axis direction are parallel. .

  Thereby, the direction in which each of the plurality of LED elements 22 emits yellowish white light is directed in the direction farthest from the center of the circumference C. As a result, the concentration of yellowish white light emitted from each LED element 22 to the central region is more reliably suppressed. Therefore, on the external appearance of the luminaire 1, the possibility that the central portion of the cover 40 appears yellower than the peripheral portion is more reliably reduced.

  In addition, since the yellowish white light emitted from each of the plurality of LED elements 22 is directed in the tangential direction of the circumference C at the position where the LED element 22 is disposed, for example, at any position on the inner surface of the cover 40. It is difficult to aggregate. That is, yellowish white light emitted from each LED element 22 is directed in various directions, and thus is less noticeable in the entire light emitted from the lighting fixture 1.

  That is, yellowish white light from each LED element 22 that causes uneven color of light emitted from the lighting fixture 1 is not only difficult to collect in the central portion of the cover 40 but also in other portions of the cover 40. It is difficult to aggregate. Therefore, for example, in the entire cover 40 of the lighting fixture 1, there is a low possibility that dark yellow appears in a specific region.

  In addition, FIG. 7 shows the attitude of the plurality of LED elements 22 arranged along the circumference C of the innermost circle, and the explanation thereof has been made. In the present embodiment, the LED elements 22 are arranged in multiple rings. All the LED elements 22 are arranged on the light source substrate 21 in the posture shown in FIG. That is, all the LED elements 22 arranged on the light source substrate 21 are arranged so that the direction of emitting yellowish white light does not face the center point P in plan view. Thereby, suppression of the color nonuniformity of the light which the lighting fixture 1 discharge | releases is ensured more, for example.

  Further, in the present embodiment, the plurality of lens portions 31 included in the light source cover 30 are configured such that a part of the light from each LED element 22 is efficiently collected in the central region of the light emitting module 20. Thereby, for example, the difference in brightness between the central portion and the peripheral portion of the cover 40 of the lighting fixture 1 is reduced.

  FIG. 8 is a cross-sectional view illustrating a configuration example of the plurality of lens units 31 included in the light source cover 30 according to the embodiment. FIG. 8 shows a partial cross section when the lighting fixture 1 is cut along a plane that passes through the six LED elements 22 arranged in the radial direction of the light source substrate 21 and is parallel to the normal direction of the light source substrate 21. Yes. In FIG. 8, different symbols (31 a, 31 b, 31 c) are assigned to distinguish each of a plurality of types of lens units included in the plurality of lens units 31.

  As shown in FIG. 8, the light source cover 30 has, for example, a plurality of types of lens portions (31a, 31b, 31c), and the different types of lens portions (31a, 31b, 31c) have different light distribution characteristics. .

  Specifically, the light distribution peak angles in the lens portions (31a, 31b, 31c) are different from each other. The light distribution peak angle is an angle formed by the optical axis direction of the LED element 22 and the direction in which the light intensity of the light intensity distribution of the lens unit is maximized.

  More specifically, in the light source cover 30 according to the present embodiment, the light distribution peak angle of the lens portion 31a closest to the central region is the smallest, and in order of the lens portion 31b and the lens portion 31c, that is, the farther from the central region. The light distribution peak angle is large.

  Therefore, each of a part of the light from the plurality of LED elements 22 arranged in the radial direction (left and right direction in FIG. 8) is efficiently collected in the central portion of the cover 40. Thereby, the difference of the brightness of the center part and the peripheral part in the cover 40 of the lighting fixture 1 is reduced.

  In the example illustrated in FIG. 8, three types of lens units 31 have been described. However, the types of the lens units 31 included in the light source cover 30 may be two types, or four or more types. Absent.

  Here, when the light source cover 30 is configured to efficiently collect each of a part of the light from the plurality of LED elements 22 in the central portion of the cover 40, yellowish white light emitted from each LED element 22 May be concentrated in the central portion of the cover 40.

  However, in the lighting fixture 1 according to the present embodiment, as described above, each LED element 22 is in a posture in which the direction in which yellowish white light is emitted does not face the center point P (see FIG. 6) in plan view. Arranged on the light source substrate 21.

  Therefore, in the lighting fixture 1 having a structure in which a dark portion is likely to occur in the central region in plan view, even when the light source cover 30 is configured to collect light in the central region so as to compensate for the weak point, for example, The possibility that the central part of the cover 40 will appear yellow is reduced.

[Effects, etc.]
As described above, the lighting fixture 1 according to the present embodiment includes the fixture body 10, the light source substrate 21 attached to the fixture body 10, and the plurality of LED elements 22 arranged side by side in the light source substrate 21. With. Each of the plurality of LED elements 22 includes an LED light source 24 and a wavelength conversion material 26a, blue light emitted from the LED light source 24, and yellow light that is light after wavelength conversion of the blue light by the wavelength conversion material 26a. The synthesized light generated by the synthesis of is emitted. In each of the plurality of LED elements 22, the proportion of yellow light contained in the combined light emitted in the A-axis direction (see FIG. 5) is emitted in the other direction (in this embodiment, the same applies to the B-axis direction hereinafter). It is larger than the proportion of yellow light contained in the synthesized light. Each of the plurality of LED elements 22 is arranged on the light source substrate 21 in a posture in which the A-axis direction is not orthogonal to the arrangement direction of the plurality of LED elements 22.

  According to this configuration, each of the plurality of LED elements 22 is disposed on the light source substrate 21 in a posture in which yellow-white light is difficult to face in the center of the ring shape formed by the arrangement of the plurality of LED elements 22. Therefore, for example, the concentration of yellowish white light to the central portion of the cover 40 of the lighting fixture 1 is suppressed, and as a result, the possibility that the central portion of the cover 40 looks yellower than the peripheral portion is reduced. That is, uneven color of light emitted from the lighting fixture 1 is suppressed.

  In the present embodiment, in each of the plurality of LED elements 22, the LED light source 24 is covered with the wavelength conversion layer 26 including the wavelength conversion material 26a, and white light emitted from the LED light source 24 in the A-axis direction. Is longer than the length that white light in the other direction passes through the wavelength conversion layer 26.

  That is, in the present embodiment, the distance (optical path length) of the blue light emitted from the LED light source 24 (two LED chips 25) that undergoes wavelength conversion by the wavelength conversion material 26a is the A-axis direction and the B-axis direction. It is different. Specifically, the optical path length in the A-axis direction is longer than the optical path length in the B-axis direction. As a result, yellowish white light is emitted from the LED element 22 in the A-axis direction. Therefore, for example, when a plurality of certain types of LED elements are arranged on the light source substrate 21 in a ring shape, the position of the LED light source (LED chip) in the LED elements of the type is confirmed, and the optical path compared to other directions. The long direction is arranged, for example, in the tangential direction of the circumference C (see FIG. 7). Thereby, for example, aggregation of light of a specific color on the central portion of the cover 40 of the lighting fixture 1 can be suppressed. That is, for example, without actually measuring the light distribution characteristics of the LED element, the attitude in a plan view when the LED element is arranged on the light source substrate 21, and for suppressing color unevenness of the light emitted by the lighting fixture 1. The posture can be determined.

  In the present embodiment, in each of the plurality of LED elements, the LED light source 24 is covered with the wavelength conversion layer 26 including the wavelength conversion material 26a, and the wavelength from the LED light source 24 in the A-axis direction in plan view. The length La to the end of the conversion layer 26 is shorter than the length Lb from the LED light source 24 to the end of the wavelength conversion layer 26 in the other direction.

  In this case, for example, the length that the blue light emitted from the LED light source 24 passes through the wavelength conversion layer 26 in the A-axis direction is longer than the length that the blue light emitted from the LED light source 24 passes through the wavelength conversion layer 26 in the B-axis direction. Can be considered long. In this case, it can be said that the LED element 22 is highly likely to emit yellowish white light in the A-axis direction. Therefore, for example, when a plurality of LED elements of a certain type are arranged on the light source substrate 21 in a ring shape, the position of the LED light source (LED chip) in the LED elements of that type is confirmed, and the wavelength compared to other directions. The direction in which the length to the end of the conversion layer is long is arranged, for example, in the tangential direction of the circumference C (see FIG. 7). Thereby, for example, aggregation of light of a specific color on the central portion of the cover 40 of the lighting fixture 1 can be suppressed. That is, for example, without actually measuring the light distribution characteristics of the LED element, the attitude in a plan view when the LED element is arranged on the light source substrate 21, and for suppressing color unevenness of the light emitted by the lighting fixture 1. The posture can be determined.

  Moreover, in this Embodiment, each of the some LED element 22 has the container 23 which accommodates the LED light source 24 and the wavelength conversion material 26a. The shape of the container 23 in a plan view is a rectangle having a first side 23a and a second side 23b that are orthogonal to each other. In each of the plurality of LED elements 22, the proportion of yellow light in the combined light emitted in the direction along the first side 23a that is the A-axis direction is emitted in the direction along the second side 23b that is the B-axis direction. It is larger than the proportion of yellow light in the combined light.

  According to this configuration, for example, when an LED element having a rectangular container in plan view is used as the light source of the light emitting module 20, two directions along two orthogonal sides (for example, the A axis direction and the B axis in FIG. 4). By measuring or observing the light emitted in the (direction), for example, it is possible to determine which direction is not directed to the center of the light emitting module 20 (center point P in FIG. 6). That is, for example, the attitude of the LED element can be determined easily without comparing the ratio of the ratio of yellow light included in the combined light with respect to the entire circumference around the LED element.

  Moreover, in this Embodiment, the some LED element 22 is arrange | positioned along with the circumference, and each of the some LED element 22 is a tangent in the position where the said LED element 22 on a circumference is arrange | positioned. It is arranged on the light source substrate 21 in a posture along the direction along the A-axis direction.

  According to this configuration, for example, the direction of emitting yellowish white light of each of the plurality of LED elements 22 arranged is directed to the direction farthest from the center of the circumference. Therefore, for example, the possibility that the central portion of the cover 40 appears yellower than the peripheral portion is more reliably reduced. Moreover, since yellowish white light emitted from the plurality of LED elements 22 is directed in various directions, it becomes difficult to stand out in the whole light emitted from the lighting fixture 1. That is, for example, in the entire cover 40 of the lighting fixture 1, the possibility that dark yellow appears in a specific region is low.

  Moreover, the lighting fixture 1 which concerns on this Embodiment is provided with the some other LED element 22 arrange | positioned in the light source board | substrate 21 so that the several LED element 22 arrange | positioned cyclically | annularly may be enclosed.

  Specifically, for example, a plurality of other LED elements 22 are arranged on the outer periphery of the plurality of LED elements 22 arranged on the circumference C shown in FIG. 6 so as to surround the plurality of LED elements 22. . Thereby, the luminous flux of the light which the lighting fixture 1 discharge | releases can be improved.

  Here, as shown in FIG. 7, the plurality of LED elements 22 arranged on the circumference C are configured so that the A-axis direction, which is a direction in which yellowish white light is emitted, is not directed toward the center of the circumference C (A (A posture in which the axial direction is not orthogonal to the circumference C)), thereby suppressing the aggregation of yellowish white light. Such an attitude of the LED element 22 may or may not be adopted for each of the plurality of LED elements 22 along the circumference outside the circumference C. That is, in the plurality of LED elements 22 arranged so as to form a multiple ring, at least each of the plurality of LED elements 22 forming the innermost ring is in the A-axis direction (a direction in which yellowish white light is emitted). Should just be arrange | positioned with the attitude | position which is not orthogonal to the arrangement direction of several LED element 22. FIG.

  That is, at least a plurality of LED elements 22 at positions closest to the central region of the light emitting module 20 among all the LED elements 22 included in the light emitting module 20 may be arranged in the above-described posture. Thereby, possibility that the center part of the cover 40 may appear yellow rather than a peripheral part is reduced. That is, the effect of suppressing the color unevenness of the light emitted by the lighting fixture 1 can be obtained.

(Other embodiments)
As mentioned above, although the lighting fixture which concerns on this invention was demonstrated based on embodiment, this invention is not limited to said embodiment.

  For example, each of the plurality of LED elements 22 may not have a posture in which the arrangement direction of the plurality of LED elements 22 (for example, the tangential direction of the circumference C in FIG. 7) and the A-axis direction are parallel. For example, each of the plurality of LED elements 22 has a light source substrate in a posture in which the A-axis direction is inclined with respect to the arrangement direction in plan view (the angle between the A-axis direction and the arrangement direction is 0 ° or more and less than 90 °). 21 may be arranged. Further, the postures of the plurality of LEDs 22 (the angle formed by the A-axis direction and the arrangement direction) may not be unified. In any case, if the A-axis direction of each of the plurality of LED elements 22 is not orthogonal to the arrangement direction, for example, aggregation of yellowish white light to the central portion of the cover 40 is suppressed.

  Further, although the light source substrate 21 is formed in an annular shape in plan view, the present invention is not limited to this. For example, the light source substrate 21 may have a rectangular shape in a plan view and no hole in the center. Even in this case, if the plurality of LED elements 22 are annularly arranged on the light source substrate 21, the posture of each of the plurality of LED elements 22 is determined so that yellowish white light from each LED element 22 is centered. By adopting a posture that does not concentrate in the region, it is possible to obtain an effect of suppressing uneven color of light.

  Further, the shape formed by the arrangement of the plurality of LED elements 22 does not need to be a ring. The plurality of LED elements 22 may be arranged side by side in a square ring shape such as a regular polygon. Even in this case, it is possible to obtain the effect of suppressing unevenness in the color of the light by setting the posture of each of the plurality of LED elements 22 so that the yellowish white light from each LED element 22 is not concentrated in the central region. it can.

  Moreover, the lighting fixture 1 which concerns on this Embodiment is another one or more LED element 22 contained in the cyclic | annular light emitting element row | line | column formed with several LED element 22, Comprising: The arrangement direction of several LED element 22 One or more other LED elements arranged in a posture orthogonal to the A-axis direction may be provided.

  That is, for example, the A-axis direction of one or more LED elements 22 among the plurality of LED elements 22 arranged on the circumference C in FIG. 4 may be orthogonal to the circumference C.

  That is, when the A-axis direction of all the LED elements 22 included in the light emitting module 20 is directed to the tangential direction of the circumference corresponding to the LED element 22, the center portion of the cover 40 may appear to float white rather than the surroundings. It is believed that there is. Therefore, for example, by turning the A-axis of some LED elements 22 in the direction of the center point P, it is possible to adjust the yellowish white light in the central portion of the cover 40 and thereby balance the overall emission color. It is.

  Moreover, although the LED element 22 which the light emitting module 20 has was SMD type LED element, it is not restricted to this. For example, the lighting fixture 1 may be provided with a COB (Chip On Board) type light emitting module in which a bare chip is directly mounted on a substrate.

  In this case, for example, it is a sealing member (an example of a wavelength conversion layer) that individually seals a plurality of LED chips, and a sealing member including a wavelength conversion material such as the above-described yellow phosphor is disposed. The wavelength of light from the plurality of LED chips can be converted to a predetermined wavelength. In this case, for example, a combination of one LED chip and a sealing member that covers the one LED chip can be regarded as one LED element. That is, the LED element may not include a container that houses one or more LED chips (LED light sources). Even in this case, it is possible to specify the direction in which, for example, yellowish white light is emitted by measuring or observing light from the LED element.

  Moreover, for example, in the above-described embodiment, the example in which the lighting fixture 1 is a ceiling light has been described, but the present invention is not limited thereto. For example, the lighting fixture 1 may be a downlight or a pendant light.

  Other configurations and functions in the embodiment or the modification are arbitrarily selected without departing from the gist of the present invention, and forms obtained by making various modifications conceived by those skilled in the art with respect to the embodiment and the modification. Forms realized by combining them are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 10 Appliance main body 21 Light source board 22 LED element 23 Container 23a First side 23b Second side 24 LED light source 26 Wavelength conversion layer 26a Wavelength conversion material

Claims (7)

An instrument body;
A substrate attached to the instrument body;
A plurality of Light Emitting Diode (LED) elements arranged in a ring on the substrate;
Each of the plurality of LED elements is
An LED light source and a wavelength conversion material;
It is generated by combining the first light emitted from the LED light source and the second light of a color different from the first light, which is the light after the wavelength conversion material converts the wavelength of the first light. Emits synthetic light,
The ratio of the second light contained in the synthesized light emitted in a predetermined direction is larger than the percentage of the second light contained in the synthesized light emitted in the other direction,
The lighting fixture which is arrange | positioned at the said board | substrate with the attitude | position which the said predetermined direction does not orthogonally cross in the row direction of these LED element. In each of the plurality of LED elements,
The LED light source is covered with a wavelength conversion layer containing the wavelength conversion material,
The length in which the first light emitted from the LED light source in the predetermined direction passes through the wavelength conversion layer is longer than the length in which the first light in the other direction passes through the wavelength conversion layer. The lighting fixture according to 1. In each of the plurality of LED elements,
The LED light source is covered with a wavelength conversion layer containing the wavelength conversion material,
The length from the LED light source in the predetermined direction to the end of the wavelength conversion layer in a plan view is shorter than the length from the LED light source to the end of the wavelength conversion layer in the other direction. Lighting fixtures. Each of the plurality of LED elements is
The container includes the LED light source and the wavelength conversion material, and the shape of the container in a plan view is a rectangle having a first side and a second side that are orthogonal to each other.
The ratio of the second light in the combined light emitted in the direction along the first side which is the predetermined direction is the second ratio in the synthetic light emitted in the direction along the second side which is the other direction. The lighting fixture according to any one of claims 1 to 3, wherein the lighting fixture is larger than a ratio of two lights. The plurality of LED elements are arranged side by side on the circumference,
Each of these LED elements is arrange | positioned at the said board | substrate with the attitude | position which the said predetermined direction follows in the tangential direction in the position where the said LED element on the said circumference is arrange | positioned. A lighting apparatus according to claim 1. Furthermore, the said board | substrate is equipped with several other LED element arrange | positioned so that the said some LED element arrange | positioned cyclically | annularly, The lighting fixture as described in any one of Claims 1-5. Furthermore, it is one or more other LED elements included in the annular light emitting element array formed by the plurality of LED elements, and is arranged in a posture in which the predetermined direction is orthogonal to the arrangement direction of the plurality of LED elements. The lighting fixture as described in any one of Claims 1-6 provided with one or more other LED elements.

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