JP6601653B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device including a filter element that cuts a part of wavelength components of light.

  Various efforts have been made to improve the appearance of the light emitted by the lighting device. For example, Patent Literature 1 discloses an illumination device including a filter (filter element) for improving color rendering properties and the like.

JP 2014-75186 A

  In an illuminating device provided with the above filter elements, it is a subject to suppress degradation of a filter element.

  Therefore, the present invention provides an illumination device that can suppress deterioration of the filter element.

  An illumination device according to one embodiment of the present invention includes a light source, a filter element that cuts a part of a wavelength component of light from the light source, and a lens provided between the light source and the filter element. The distance between the light source and the filter element is 8 mm or more and 100 mm or less.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can suppress deterioration of a filter element is implement | achieved.

1 is an external perspective view of a lighting fixture including the lighting device according to Embodiment 1. FIG. FIG. 2 is an external perspective view of the lighting apparatus according to Embodiment 1. FIG. FIG. 3 is an exploded perspective view of the lighting device according to Embodiment 1 as seen from below. FIG. 4 is an exploded perspective view of the illumination device according to Embodiment 1 as viewed from above. FIG. 5 is a diagram illustrating characteristics of the filter element according to the first embodiment. FIG. 6 is a cross-sectional view for explaining a component arrangement of the lighting apparatus according to Embodiment 1. FIG. 7 is a diagram illustrating a simulation result of the illuminance of light applied to the filter element when no lens is provided. FIG. 8 is a diagram illustrating a simulation result of the illuminance of light applied to the filter element when a lens is provided. FIG. 9 is a diagram illustrating a simulation result of the illuminance ratio for each irradiation position (illuminance with a lens / illuminance without a lens).

  Hereinafter, embodiments will be specifically described with reference to the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, and the overlapping description may be abbreviate | omitted or simplified.

(Embodiment 1)
[Constitution]
Hereinafter, the configuration of the lighting apparatus according to Embodiment 1 will be described. 1 is an external perspective view of a lighting fixture including the lighting device according to Embodiment 1. FIG.

  A lighting fixture 10 shown in FIG. 1 is a lighting fixture (ceiling light) having a circular shape in plan view attached to a ceiling surface. The lighting fixture 10 includes three lighting devices 100 arranged at equal intervals on the outer edge portion of the main body 11.

  The lighting device 100 is a spotlight for further locally illuminating the room illuminated by the main body 11 of the lighting fixture 10. The lighting device 100 emits light by direct current power supplied from the main body 11.

  Next, the configuration of the illumination device 100 will be described. FIG. 2 is an external perspective view of the lighting device 100. FIG. 3 is an exploded perspective view of the lighting device 100 as viewed from below, and FIG. 4 is an exploded perspective view of the lighting device 100 as viewed from above. In the following description, the Z axis + side in the figure is expressed as “upper side”, and the Z axis − side in the figure is expressed as “lower side”. “Lower side” is also described as the light emitting side.

  As shown in FIGS. 2 to 4, the lighting device 100 includes a housing holding unit 110, a housing 120 (first housing 120 a and second housing 120 b), a light emitting module 130, and a tubular body 140. The lens 150 and the filter element 160 are provided.

  The housing holding unit 110 is a member that holds the housing 120 in a state in which the posture of the housing 120 (light irradiation direction of the lighting device 100) can be changed. Specifically, the housing holding part 110 is provided with a substantially hemispherical recess 111, and the housing 120 is placed in a state where a part of the housing 120 (mainly the first housing 120 a) is accommodated in the recess 111. Hold. The housing holding part 110 is made of, for example, resin, but may be made of metal or the like. The housing holding unit 110 is located inside the main body 11 in a state where the lighting device 100 is incorporated in the main body 11 and cannot be visually recognized from the outside.

  The housing 120 is an outer housing having a substantially spherical outer shape that houses the light emitting module 130, the cylindrical body 140, the lens 150, and the filter element 160. Specifically, the housing 120 includes a first housing 120a and a second housing 120b.

  The first housing 120a is a portion of the housing 120 having a column 121 to which the light emitting module 130 is connected (mounted). The first housing 120a has a substantially hemispherical shape and is formed of a metal material such as aluminum. Since the first housing 120a also functions as a heat sink for the light emitting module 130, the first housing 120a is preferably formed of a metal material, but may be formed of a resin material. Although not shown, a heat radiating member (such as heat radiating silicone and a heat radiating sheet) may be provided between the light emitting module 130 and the column 121.

  The second housing 120b is a portion of the housing 120 that has an emission port 122 through which light from the light emitting module 130 is emitted. The second housing 120b is substantially hemispherical, and is formed of an insulating resin material such as PBT (polybutylene terephthalate), but may be formed of a metal material.

  The emission port 122 is a circular opening, and is closed by the filter element 160 from the inside of the second housing 120b. The diameter of the emission port 122 is smaller than the diameter of the filter element 160.

  An annular stepped portion 127 (shown in FIG. 4) surrounding the emission port 122 is provided inside the second housing 120 b and around the emission port 122. The step portion 127 is a step for restricting (arranging) the position of the lens 150 and the filter element 160.

  The first housing 120a and the second housing 120b are fixed by screws inserted from above (Z axis + side). Specifically, the screw inserted into the screw insertion hole 123a of the first housing 120a is screwed to the boss 124a of the second housing 120b, and the screw inserted into the screw insertion hole 123b is connected to the boss 124b. The first casing 120a and the second casing 120b are fixed by being screwed.

  The light emitting module 130 is an example of a light source, and emits light of a predetermined color (wavelength) such as white by DC power supplied from the main body 11. The light emitted from the light emitting module 130 passes through the lens 150 and the filter element 160 in this order and is emitted to the outside of the illumination device 100. Specifically, the light emitting module 130 includes a substrate 131 and a light emitting unit 132.

  The substrate 131 is a substantially rectangular substrate having a first main surface (Z-axis-side main surface), and a plurality of LEDs (light emitting elements) constituting the light emitting unit 132 mounted on the first main surface. . A wiring pattern for supplying power to the plurality of LEDs is provided on the first main surface of the substrate 131. Specifically, the substrate 131 is, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like.

  The light emitting unit 132 is a light emitting unit having a COB (Chip On Board) structure including a plurality of LEDs mounted on the substrate 131 and a sealing member that seals the plurality of LEDs, and emits white light. The planar view shape of the light emitting unit 132 is a circle.

  As the LED constituting the light emitting unit 132, for example, a gallium nitride LED chip having a center wavelength (peak wavelength of emission spectrum) of 430 nm or more and 480 nm or less made of an InGaN material is employed. In other words, the LEDs constituting the light emitting unit 132 emit blue light.

  Further, although not shown in detail, the plurality of LEDs constituting the light emitting unit 132 are mainly connected by Chip To Chip by bonding wires. Note that the bonding wire and the metal material of the above wiring pattern are, for example, gold (Au), silver (Ag), copper (Cu), or the like.

  Specifically, the sealing member constituting the light emitting unit 132 is made of a translucent resin material containing yellow phosphor particles as a wavelength conversion material. As the translucent resin material, for example, a silicone resin is used, but an epoxy resin or a urea resin may be used. Further, for example, yttrium / aluminum / garnet (YAG) phosphor particles are employed as the yellow phosphor particles.

  In the light emitting module 130, a part of blue light emitted from the plurality of LEDs is wavelength-converted to yellow light by the yellow phosphor particles contained in the sealing member. The blue light that has not been absorbed by the yellow phosphor particles and the yellow light that has been wavelength-converted by the yellow phosphor particles are diffused and mixed in the sealing member. Thereby, white light is emitted from the light emitting module 130 (sealing member). The translucent resin material may contain red phosphor particles and green phosphor particles in addition to yellow phosphor particles for the purpose of improving color rendering.

  In addition to such a wavelength conversion function, the sealing member also has a function of protecting a plurality of LEDs and bonding wires from dust, moisture, external force, and the like.

  The light emitting module 130 configured as described above is provided inside the first housing 120a on the second main surface of the substrate 131 (the main surface on the Z axis + side, the main surface opposite to the first main surface). Connected to the support post 121. The power supply to the light emitting module 130 is performed by a cable (not shown) inserted through a cable insertion hole 125 (shown in FIG. 4) provided in the first housing 120a.

  The cylindrical body 140 is a substantially cylindrical member disposed inside the housing 120 and between the light emitting module 130 and the lens 150 (filter element 160). Specifically, the cylindrical body 140 is a first opening 141 provided on the light emitting module 130 side, and an opening communicating with the first opening 141 and the second opening 142 provided on the lens 150 side. And have. Note that the inner diameter of the first opening 141 is smaller than the inner diameter of the second opening 142. The light emitting module 130 is disposed so as to close the first opening 141, and the lens 150 is disposed so as to close the second opening 142. Specifically, the cylindrical body 140 is formed of a resin material such as PBT, but may be formed of a metal material.

  On the outer wall of the cylindrical body 140, an attachment portion 145a that forms a screw insertion hole 144a and an attachment portion 145b that forms a screw insertion hole 144b are provided. Cylindrical body 140 is attached to first housing 120a with a screw inserted from below (Z-axis-side). Specifically, the cylindrical body 140 has a screw inserted through the screw insertion hole 144a screwed into the screw hole 126a of the first housing 120a and a screw inserted through the screw insertion hole 144b into the first housing. It is attached to the first housing 120a by being screwed into the screw hole 126b of 120a.

  The inner diameter of the first opening 141 of the cylindrical body 140 is slightly larger than the diameter of the light emitting unit 132. The inner diameter (diameter) of the second opening 142 of the cylindrical body 140 is smaller than the diameter of the lens 150 and slightly smaller than the diameter of the filter element 160.

In the following embodiments, the light emitting module 130, a space surrounded by the tubular member 140, and the lens 150 is described as between the internal air. Between internal empty, in other words, among the space surrounded by the tubular member 140, a space located between the first opening 141 and second opening 142.

  The lens 150 is an optical member having specific optical characteristics. In the first embodiment, the lens 150 is a convex lens (Fresnel lens) for diffusing (or collimating) light from the light emitting module 130. The planar view shape of the lens 150 is a substantially circular shape (a circular shape with a part cut out from the outer peripheral side), and an annular prism is provided on the incident surface (Z-axis + side surface) of the lens.

  The lens 150 is formed of a resin material such as acrylic (PMMA) or polycarbonate (PC). The lens 150 may be provided with dimples for suppressing unevenness of light emitted from the lens 150. In this case, the dimple is provided, for example, on the exit surface (Z-axis-side surface) of the lens 150.

  The lens 150 is disposed between the light emitting module 130 and the filter element 160. Further, the lens 150 is disposed along the stepped portion 127 of the second housing 120b. The position of the lens 150 on the XY plane is regulated by the step portion 127.

  Further, the lens 150 is disposed on the light emitting side of the cylinder 140 so as to close the second opening 142 of the cylinder 140. The position of the lens 150 in the Z-axis direction is regulated by the end portion 147 forming the second opening 142 of the cylindrical body 140 coming into contact with the lens 150 from the upper side (Z axis + side). The lens 150 is disposed between the light emitting module 130 and the filter element 160 so as to face the light emitting unit 132.

  The filter element 160 is an optical filter that is provided between the light emitting module 130 in the housing 120 and the emission port 122 and cuts a part of wavelength components of light from the light emitting module 130. Specifically, the filter element 160 closes the emission port 122 from the inside of the housing 120 and absorbs a part of the wavelength component of the light from the light emitting module 130. The filter element 160 has a circular plate shape partially cut away from the outer peripheral side, but may have other shapes such as a rectangular plate shape. The diameter of the filter element 160 is smaller than the diameter of the lens 150. That is, the area of the surface of the filter element 160 facing the lens 150 is smaller than the area of the surface of the lens 150 facing the filter element 160.

  The filter element 160 is disposed along a step located in the exit port 122 side of the step portion 127 with respect to the step where the lens 150 is disposed. That is, the filter element 160 is disposed between the lens 150 and the emission port 122. The position of the filter element 160 on the XY plane is regulated by the step portion 127, and the position of the filter element 160 in the Z-axis direction is determined by the lens 150 coming into contact with the filter element 160 from the upper side (Z axis + side). Be regulated. The distance (play) between the lens 150 and the filter element 160 is about 0.5 mm.

  Specifically, the filter element 160 is formed of an acrylic resin containing a tetraazaporphyrin-based pigment containing a metal element such as copper (Cu), nickel (Ni), and cobalt (Co). Looks like. In Embodiment 1, the pigment contained in the filter element 160 contains nickel.

  Further, the filter element 160 has a characteristic of mainly absorbing a wavelength component of 585 nm or more and 595 nm or less using such a dye. FIG. 5 is a diagram showing the characteristics of the filter element 160. In addition, the vertical axis | shaft of FIG. 5 shows the transmittance | permeability of light, and a horizontal axis shows the wavelength of light.

  As shown in FIG. 5, the transmittance of the filter element 160 with respect to light having a wavelength component of 585 nm or more and 595 nm or less is 50% or less. Due to the characteristics of the filter element 160, the average color rendering index Ra of the light emitted from the lighting device 100, an index PS (Preference Index of Skin Color) indicating the preference of the skin color, and an index indicating the vividness of the color. FCI (Feeling of Contrast Index) etc. can be improved.

  The acrylic resin constituting the filter element 160 may include an ultraviolet absorber (UVA: Ultraviolet Absorber), a light stabilizer (HALS: Hindered Amine Light Stabilizer), and the like. Further, the acrylic resin constituting the filter element 160 may include a quencher that suppresses deterioration of the acrylic resin. The filter element 160 may be formed of other resin materials such as polycarbonate resin.

[Feature configuration]
In the illumination device 100, the filter element 160 is disposed at a position away from the light emitting module 130 by a certain distance or more in order to suppress deterioration of the filter element 160 caused by light emitted from the light emitting module 130. Such a component arrangement is a feature of the lighting device 100. FIG. 6 is a cross-sectional view for explaining the component arrangement of the lighting device 100. In FIG. 6, the housing holding unit 110 is not shown.

  In FIG. 6, the distance between the light emitting module 130 and the filter element 160 is described as L [mm]. More precisely, the length L is the length from the lower end (Z-axis-side end, light-emitting side end) of the light emitting module 130 to the upper end (Z-axis + side end) of the filter element 160. It is.

  In the illumination device 100, specifically, L = 11 [mm], but L may be at least 8 mm or more. Thus, if the distance L between the light emitting module 130 and the filter element 160 is 8 mm or more, the deterioration of the filter element 160 due to the light emitted from the light emitting module 130 can be suppressed.

  In addition, the effect which suppresses deterioration of the filter element 160 is so high that the distance L is large. However, the distance L is considered to be 100 mm or less even in an outdoor spotlight that is considered to be larger in size than the lighting device 100. Therefore, the distance L should just be 8 mm or more and 100 mm or less.

  In general lighting devices, a filter element 160 is often provided between the light emitting module 130 and the lens 150. However, in the illumination device 100, the lens 150 is disposed between the light emitting module 130 and the filter element 160, and such a component arrangement is also a feature of the illumination device 100.

  When the lens 150 is disposed between the light emitting module 130 and the filter element 160, the illuminance of light hitting the filter element 160 can be reduced. Hereinafter, such an effect will be described. FIG. 7 is a diagram illustrating a simulation result of the illuminance of light applied to the filter element 160 when the lens 150 is not provided. FIG. 8 is a diagram illustrating a simulation result of the illuminance of light irradiated on the filter element 160 when the lens 150 is provided. FIG. 9 is a diagram illustrating a simulation result of the ratio of illuminance at each irradiation position (illuminance with the lens 150 / illuminance without the lens 150). The direction indicated by the horizontal axis in FIG. 9 is the Y-axis direction.

  As shown in FIGS. 7 and 8, the distribution of illuminance applied to the filter element 160 differs depending on the presence or absence of the lens 150. Here, the point indicating the illuminance ratio in FIG. 9 indicates a position where the illuminance is higher (1 or more) when there is a lens than when there is no lens.

  The average value of the illuminance ratio including the point where the illuminance ratio is not shown in FIG. 9 is less than 1 is 0.97, and the illuminance is more relaxed when the lens 150 is present than when the lens 150 is absent. Further, the ratio of the point where the illuminance ratio shown in FIG. 9 is 1 or more is 40% or less, and in particular, the ratio of the point where the illuminance ratio is 1.5 or more is 11 % Or less.

  As described above, when the lens 150 is disposed between the light emitting module 130 and the filter element 160, the illuminance of the light applied to the filter element 160 is reduced, and the filter element resulting from the light emitted from the light emitting module 130 is obtained. The degradation of 160 can be suppressed.

  In addition, when the lens 150 is arrange | positioned between the light emitting module 130 and the filter element 160, since the light from the light emitting module 130 is spread by the lens 150, the diameter of the filter element 160 may become large.

  Therefore, in the illuminating device 100, the distance between the lens 150 and the filter element 160 is shortened as much as possible to reduce the size of the filter element 160.

  In the illuminating device 100, the distance between the lens 150 and the filter element 160 is specifically 0.5 mm or less, but may be 0 mm or more and 2 mm or less. Accordingly, the filter element 160 can be reduced in size, and in the illumination device 100, the diameter of the filter element 160 is smaller than the diameter of the lens 150. More specifically, the area of the surface of the filter element 160 facing the lens 150 is equal to or smaller than the area of the surface of the lens 150 facing the filter element 160.

  By reducing the size of the filter element 160 as described above, it is possible to reduce the manufacturing cost of the illumination device 100 (part cost of the filter element 160).

(Other embodiments)
Although the embodiment has been described above, the present invention is not limited to such an embodiment.

  For example, in the above embodiment, the lighting device 100 has been described as a spotlight. However, the present invention can be applied to illumination devices other than spotlights such as downlights as long as the illumination device includes a filter element.

  Moreover, in the said embodiment, although the light emitting module was a light emitting module of the COB structure, it may be a SMD (Surface Mount Device) type.

  In the above embodiment, the light emitting module uses an LED as a light emitting element. However, a semiconductor light emitting element such as a semiconductor laser, or a solid light emitting element such as an organic EL (Electro Luminescence) or an inorganic EL may be used. Good.

As mentioned above, although the illuminating device which concerns on one or several aspects was demonstrated based on embodiment, this invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

DESCRIPTION OF SYMBOLS 100 Illuminating device 120 Case 122 Outlet 130 Light emitting module (light source)
140 cylinder 150 lens 160 filter element

Claims (6)

A light source;
A filter element that cuts off a part of the wavelength component of light from the light source;
A lens provided between the light source and the filter element;
A housing that has an exit through which light from the light source is emitted, and that houses the light source, the lens, and the filter element ;
An inside of the housing, comprising a cylinder disposed between the light source and the lens ;
The distance between the light source and the filter element is 8 mm or more and 100 mm or less,
Wherein the housing, have a stepped portion for restricting the position of the filter element and the lens,
The filter element closes the emission port from the inside of the housing,
The step portion regulates the position of the filter element and the lens in the radial direction of the filter element,
The cylindrical body is an illumination device that regulates a position of the filter element and the lens in a thickness direction of the filter element . The lighting device according to claim 1, wherein a distance between the lens and the filter element is 0 mm or more and 2 mm or less. The lighting device according to claim 1 or 2, wherein an area of a surface of the filter element facing the lens is equal to or smaller than an area of a surface of the lens facing the filter element. The illuminating device according to any one of claims 1 to 3, wherein a transmittance of the filter element with respect to light having a wavelength component of 585 nm to 595 nm is 50% or less. The lighting device according to claim 1, wherein the pigment contained in the filter element includes nickel. The lens has an annular prism on the light source side surface of the lens,
The annular prism, the illumination device according to any one of claims 1 to 5, positioned inside the tubular body.

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