CN110131683B - Light emitting module - Google Patents
Light emitting module Download PDFInfo
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- CN110131683B CN110131683B CN201910099505.0A CN201910099505A CN110131683B CN 110131683 B CN110131683 B CN 110131683B CN 201910099505 A CN201910099505 A CN 201910099505A CN 110131683 B CN110131683 B CN 110131683B
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- light
- light emitting
- emitting element
- wavelength conversion
- conversion unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
- F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
- F21S43/16—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Led Device Packages (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
Abstract
A light emitting module having a different directional characteristic from that of a light emitting element itself is provided. A light-emitting module (20) is provided with: a substrate (22); a light emitting element (24) which is provided on the substrate and emits ultraviolet light or short-wavelength visible light; and a light wavelength conversion unit (26) which is provided on the light-emitting surface (24a) side of the light-emitting element and emits visible light excited by ultraviolet light or short-wavelength visible light emitted by the light-emitting element. The optical wavelength conversion unit (26) is configured to: the peak direction of the intensity of the emitted visible light is different from the peak direction of the intensity of the ultraviolet light or short-wavelength visible light emitted by the light-emitting element.
Description
Technical Field
The present invention relates to a light emitting module.
Background
Conventionally, there has been designed an illumination device using an LED light source that emits visible light. Since a general LED light source has high directivity, the front surface of the light emitting surface of the LED light source is illuminated brightly, while positions other than the front surface are not illuminated brightly. Therefore, in some cases, it is difficult to obtain a light distribution characteristic required for a use in an illumination device using an LED. In this case, the lighting device needs to control the directivity of light.
For example, there is designed a lighting device configured such that a light-emitting surface side of an LED light source provided on a substrate is covered with a translucent cover having surfaces facing in a plurality of different directions, and the translucent cover contains a scattering filler (see patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-251080
Disclosure of Invention
Technical problem to be solved by the invention
However, in the above-described lighting device, since the visible light emitted from the directional light source reaches the translucent cover as it is, the light of the light source hardly reaches the region of the translucent cover located on the side of the light source. Therefore, the difference in brightness in one plane is likely to increase.
The present invention has been made in view of such circumstances, and an object thereof is to provide a light emitting module having a different directional characteristic from that of a light emitting element itself.
Means for solving the problems
In order to solve the above problem, a light emitting module according to an aspect of the present invention includes: a substrate; a light emitting element which is provided on a substrate and emits ultraviolet light or short-wavelength visible light; and a light wavelength conversion unit that is provided on the light emitting surface side of the light emitting element and emits visible light excited by ultraviolet light or short-wavelength visible light emitted by the light emitting element. The optical wavelength conversion unit is configured to: the peak direction of the intensity of the emitted visible light is different from the peak direction of the intensity of the ultraviolet light or short-wavelength visible light emitted by the light-emitting element.
With this configuration, since the directivity of the visible light emitted from the light wavelength conversion section is different from the directivity of the ultraviolet light or the short-wavelength visible light emitted from the light emitting element, it is possible to realize a light emitting module having a directivity characteristic different from that of the light source itself.
The light wavelength conversion portion may be configured such that an emission surface from which visible light is emitted is inclined with respect to a light emission surface of the light emitting element, and the emission surface may be disposed substantially perpendicular with respect to an intensity peak direction of the emitted visible light. Accordingly, the peak direction of the intensity of the visible light emitted from the emission surface of the light wavelength conversion unit can be inclined with respect to the light emitting surface of the light emitting element, and therefore, the directivity characteristics of the light emitting module can be changed without using an optical control member such as a lens.
The optical wavelength conversion unit includes: a transmission member that seals a light emitting surface of the light emitting element, or that is in contact with a member that seals the light emitting surface of the light emitting element and transmits ultraviolet light or short-wavelength visible light; and a phosphor contained in the transmission member. Thus, since the light emitting surface is covered with a material having a higher refractive index than air, the efficiency of light extraction from the light emitting surface is improved.
The wavelength conversion unit includes: a plurality of plate-shaped transmission members arranged in a non-parallel manner with respect to the substrate, or having a plurality of emission surfaces that are not parallel with respect to the substrate; and a phosphor contained in the transmissive member, the transmissive member being configured to exit from the light emitting element. Thus, an optical wavelength conversion unit having a directivity different from the directivity of the light emitting element can be realized with a simple configuration.
The transmission member is disposed away from the substrate such that a relative radiation intensity of ultraviolet or short-wavelength visible light emitted from the light emitting element is contained in a range of radiation angles of 0.5 or more. Thus, since ultraviolet light or short-wavelength visible light emitted from the light emitting element can be made incident on the entire transmissive member, the difference in luminance in the light emitting surface of the light wavelength conversion section that emits visible light can be reduced.
It should be noted that any combination of the above-described constituent elements or a structure in which the expression of the present invention is changed between a method, an apparatus, a system, and the like is also effective as an aspect of the present invention.
Effects of the invention
According to the present invention, a light emitting module having a different directional characteristic from that of a light emitting element itself can be realized.
Drawings
Fig. 1 is a cross-sectional view showing a schematic configuration of a vehicle lamp including a light emitting module according to the present embodiment.
Fig. 2(a) is a schematic diagram for explaining the directivity characteristics of a general LED, and fig. 2(b) is a schematic diagram for explaining an example of the directivity characteristics of the light-emitting module according to the present embodiment.
Fig. 3 is a perspective view of the light emitting module shown in fig. 1.
Fig. 4 is a sectional view a-a of the light emitting module shown in fig. 3.
Fig. 5 is a diagram showing a modification of the light emitting module shown in fig. 4.
Fig. 6 is a side view of the light emitting module according to embodiment 2.
Fig. 7(a) is a diagram showing total reflection of light when the emission surface is a flat surface, and fig. 7(b) is a diagram showing emission of light when the emission surface is an uneven surface.
Fig. 8(a) to 8(f) show an example of the convex portion on the concave-convex surface.
Fig. 9(a) and 9(b) show an example of a concave portion on the concave-convex surface.
Fig. 10(a) is a side view of a light-emitting module according to embodiment 4, and fig. 10(b) is a side view of a light-emitting module according to a modification of embodiment 4.
Fig. 11(a) is a side view of a light-emitting module according to embodiment 5, fig. 11(b) is a side view of a light-emitting module according to a modification of embodiment 5, and fig. 11(c) is a side view of a light-emitting module according to another modification of embodiment 5.
Fig. 12 is a side view of the light-emitting module according to embodiment 6.
Fig. 13 is a side view of the light-emitting module according to embodiment 7.
Fig. 14 is a schematic view of the vehicular lamp according to embodiment 8.
Description of the symbols
10. 20 a light emitting module; 22 a substrate; 24a light emitting element; 24a light emitting face; 26 an optical wavelength conversion unit; 28 a transmissive member; 30 a phosphor; 32a main light emitting surface; 34 an auxiliary light emitting surface; 64 a reflective member; 70 a light emitting module; 72. 74 an optical wavelength conversion unit; 76 an incident surface; 80 a light emitting module; 82 optical wavelength conversion part; a 86 reflecting mirror; 90 a light emitting module; 100 vehicular lamp.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same or equivalent constituent elements, members, and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted. The embodiments are merely examples and do not limit the invention, and all the features or combinations thereof described in the embodiments are not necessarily essential features of the invention.
[ embodiment 1 ]
(vehicle lamp)
The light emitting module according to the present embodiment can be mounted on a vehicle lamp. As the vehicle lamp, for example, there are included: headlamps, tail lamps, turn signals, width lights, turn signal lights, and the like. Fig. 1 is a cross-sectional view showing a schematic configuration of a vehicle lamp including a light emitting module according to the present embodiment.
The vehicle lamp 100 shown in fig. 1 includes: a lamp body 102; a transparent cover 104 attached to the lamp body 102 so as to cover an opening of the lamp body 102; and a light emitting module 10 disposed in a lamp chamber 106 surrounded by the lamp body 102 and the transparent cover 104.
As shown in fig. 1, the light-emitting module 10 may be disposed so that the longitudinal direction Y of the module is inclined with respect to the vehicle longitudinal direction X, depending on the shape and arrangement of the vehicle lamp 100. In this case, a direction X' perpendicular to the substrate of the light-emitting module 10 is generally an optical axis. Therefore, when a light distribution with the vehicle longitudinal direction X as the optical axis is required, it is necessary to design the orientation, layout, shape of the mounting substrate, and the like of the light emitting surface of the light emitting element in the light emitting module, and therefore the versatility of the light emitting module is reduced.
On the other hand, depending on the shape and arrangement of the vehicle lamp 100, the longitudinal direction Y of the module may be arranged perpendicular to the vehicle longitudinal direction X. In this case, the direction X' perpendicular to the substrate of the light-emitting module 10 is generally an optical axis. Therefore, it is necessary to design so as to realize light distribution with the direction inclined from the vehicle front-rear direction X as the optical axis.
Fig. 2(a) is a schematic diagram for explaining the directional characteristic of a normal LED, and fig. 2(b) is a schematic diagram for explaining an example of the directional characteristic of the light-emitting module according to the present embodiment. Fig. 2(a) and 2(b) show the relationship between the radiation angle and the relative illuminance.
As shown in fig. 2(a), the normal directional characteristic of the LED108 is that the intensity of the front surface (radiation angle 0 °) of the light emitting surface 108a is maximum. However, as shown in fig. 2(b), when the light wavelength conversion sheet 109 containing a phosphor is disposed obliquely (30 ° with respect to the light emitting surface) to the front surface of the LED108, the directivity characteristics of the entire light emitting module change. Specifically, the intensity of the front surface (radiation angle-30 °) of the optical wavelength conversion sheet 109 becomes the strongest. That is, the present inventors have conceived that the peak direction of the intensity of the emitted wavelength converted light can be made different from the peak direction of the intensity of the ultraviolet light or the short-wavelength visible light emitted from the light emitting element by designing the structure of the light wave conversion section. Hereinafter, the description will be made with reference to various embodiments of various configurations of the optical wavelength conversion unit.
Fig. 3 is a perspective view of the light emitting module 10 shown in fig. 1. Fig. 4 is a sectional view a-a of the light emitting module 10 shown in fig. 3. Although the light-emitting module 10 shown in fig. 3 has a plurality of light-emitting elements arranged in a line, the following description will be given by taking a light-emitting module having one light-emitting element as an example. Needless to say, the light-emitting module according to the present embodiment is not limited to the case where one light-emitting element is provided, and includes the case where a plurality of light-emitting elements are arranged in a linear or matrix form.
A light-emitting module 20 according to embodiment 1 shown in fig. 4 includes: a substrate 22; a light emitting element 24 which is provided on the substrate 22 and emits ultraviolet light or short-wavelength visible light; the light wavelength conversion section 26 is provided on the light emitting surface 24a side of the light emitting element 24, and emits visible light excited by ultraviolet light or short-wavelength visible light emitted from the light emitting element 24. The optical wavelength conversion unit 26 includes: a transmission member 28 that seals the light emitting surface 24a of the light emitting element 24 and transmits ultraviolet light or short-wavelength visible light; and a phosphor 30 contained in the transmissive member 28. Thereby, since the light emitting surface 24a is covered with a material having a higher refractive index than air (for example, silicone resin having a refractive index of 1.4), the extraction efficiency of light from the light emitting surface 24a is improved.
(substrate)
The substrate 22 according to the present embodiment is a lead frame made of a ceramic substrate, a glass epoxy substrate, a metal (aluminum, copper, or the like) substrate, a resin, ceramic, or a conductive member, and the like, and is only required to be able to mount an LED chip and an LED package.
(light-emitting element)
The light-emitting element 24 according to the present embodiment is not particularly limited as long as it can emit at least ultraviolet light or short-wavelength visible light, and the emission spectrum thereof is preferably such that the peak of the emission spectrum is in the wavelength range of 380nm to 430nm from the viewpoint of the light emission efficiency of the light-emitting device and the like.
As specific examples of the light-emitting element, for example, there can be used: semiconductor light emitting elements such as LEDs, LDs, and ELs, light sources for obtaining light emission from vacuum discharge or thermal light emission, and various light sources such as electron beam excitation light emitting elements. By using a semiconductor light-emitting element as a light-emitting element, a light-emitting device which is small in size, can save power and has a long life can be obtained. Suitable examples of such a semiconductor light emitting element include LEDs and LDs made of GaN-based compounds (GaN, InGaN, etc.) and AIN-based compounds having excellent light emission characteristics in a wavelength range around 400 nm. Further, the LED chip or a component for packaging the LED chip may be used.
(transmissive member)
The transmissive member 28 is not particularly limited as long as it is a member that transmits visible light, such as silicone resin, epoxy resin, acrylic resin, or glass, but is preferably a material that does not deteriorate with light from the light-emitting element 24. The optical wavelength conversion part 26 is preferably configured such that the ratio of light emitted from the light emitting element 24 transmitted through the light transmitting member 28 is 20% or less. More preferably, the optical wavelength conversion unit 26 is configured to have a transmittance of 5% or less.
(phosphor)
The phosphor 30 according to the present embodiment may contain a fluorescent component excited by light having a wavelength in the range of 380nm to 430 nm. The fluorescent components include, for example: a yellow phosphor having a peak wavelength in the emission spectrum within the range of 550-600nm, a blue phosphor having a peak wavelength in the emission spectrum within the range of 430-480nm, a green phosphor having a peak wavelength in the emission spectrum within the range of 480-550nm, a red phosphor having a peak wavelength in the emission spectrum within the range of 600-700nm, and an amber phosphor having a peak wavelength in the emission spectrum within the range of 580-620 nm. The phosphor may be appropriately selected from a plurality of phosphors according to the color and emission intensity required for the light-emitting module.
The concentration of the entire phosphor contained in the optical wavelength conversion section 26 may be 0.1 vol% or more, preferably 0.5 vol% or more, and more preferably 1.0 vol% or more. When the concentration of the phosphor is 0.1 vol% or more, visible light having a sufficient luminous flux can be generated by light emitted from the light emitting element. The concentration of the entire phosphor contained in the optical wavelength conversion section 26 may be 30 vol% or less, preferably 10 vol% or less, and more preferably 6.0 vol% or less. When the concentration of the entire phosphor is 30 vol% or less, the ratio of scattering and shielding of visible light excited by the phosphor by other phosphors decreases, and the decrease in the light emission efficiency of the light emitting module is suppressed.
(method of manufacturing light emitting Module)
Next, an example of a method for manufacturing a light-emitting module according to the present embodiment will be described. First, one or more LED chips emitting near ultraviolet rays or short wavelength visible light are mounted on a substrate made of alumina, aluminum, glass-reinforced epoxy resin, or the like, on which a circuit pattern is formed in advance. The mounting method is carried out by the following method: a method of encapsulating an LED chip in advance and then mounting the same by soldering, a method of bonding an LED chip to a substrate by using a chip bonding material and then performing chip bonding with a gold wire, and the like.
A silicone resin containing a phosphor is mounted as the light wavelength conversion section 26 directly above each of the mounted LED chips, and the phosphor absorbs light emitted from the LED chips and converts it into light of various colors. As shown in fig. 4, the optical wavelength conversion unit 26 according to the present embodiment is a triangular prism member having a triangular cross section.
The optical wavelength conversion unit 26 includes: a main light emitting surface 32 which is located above the light emitting surface 24a of the light emitting element 24 and has a large area; and a sub light emission surface 34 which is not located above the light emission surface 24a of the light emitting element 24 and has a smaller area than the main light emission surface 32. In this way, the light wavelength conversion section 26 according to the present embodiment is configured such that the area of the main light emission surface 32 is larger than that of the sub light emission surface 34, and thereby more converted light obtained by converting ultraviolet light or short-wavelength visible light by the phosphor 30 is emitted from the main light emission surface 32. Note that main light emission surface 32 is not necessarily a completely flat surface, and may have a slightly curved surface.
Therefore, the optical wavelength conversion unit 26 is configured to: the peak direction D2 of the intensity of the emitted visible light is different from the peak direction D1 of the intensity of the ultraviolet light or short-wavelength visible light emitted by the light-emitting element. Accordingly, since the directivity of the visible light emitted from the light wavelength conversion unit 26 is different from the directivity of the ultraviolet light or the short-wavelength visible light emitted from the light emitting element 24, the light emitting module 20 having a directivity characteristic different from that of the light emitting element 24 itself as a light source can be realized.
The optical wavelength conversion unit 26 is disposed such that the main light emission surface 32 that emits visible light is inclined with respect to the light emission surface 24a of the light emitting element 24. The main light emission surface 32 is provided so as to be substantially perpendicular to the peak direction of the intensity of the emitted visible light. Accordingly, the peak direction of the intensity of the visible light emitted from the main light emission surface 32 of the light wavelength conversion unit 26 can be inclined with respect to the light emission surface 24a of the light emitting element 24, and therefore, the directivity characteristics of the light emitting module 20 can be changed without using an optical control member such as a lens.
Fig. 5 is a diagram illustrating a modification of the light emitting module 20 shown in fig. 4. In the light emitting module 40 shown in fig. 5, a plurality of main light emitting surfaces 32a and a plurality of sub light emitting surfaces 34a are alternately arranged on the upper surface of the light wavelength conversion section 26. With this configuration, since the total sum of the plurality of main light emission surfaces 32a is larger than the total sum of the plurality of sub light emission surfaces 34a, the light wavelength conversion unit 26 is configured such that the peak direction D2 of the intensity of the visible light emitted from the light wavelength conversion unit 26 is different from the peak direction D1 of the intensity of the ultraviolet light or short-wavelength visible light emitted from the light emitting element.
In the light emitting module 20 and the light emitting module 40, the auxiliary light emitting surface may be covered with a light reflecting layer such as a metal thin film. As a result, the converted light emitted from the auxiliary light emitting surface is reflected toward the inside of the optical wavelength conversion unit 26, and at least a part of the converted light is emitted from the main light emitting surface, so that the directivity characteristic of the entire light emitting module is closer to the direction perpendicular to the main light emitting surface.
(embodiment 2)
Fig. 6 is a side view of the light emitting module according to embodiment 2. Note that the same reference numerals are used for the same components as those of the light-emitting module 20 according to embodiment 1, and the description thereof is omitted as appropriate. The light emitting module 50 shown in fig. 6 includes: a substrate 22; a light emitting element 24 which is provided on the substrate 22 and emits ultraviolet light or short-wavelength visible light; and a light wavelength conversion unit 52 that is provided on the light-emitting surface 24a side of the light-emitting element 24 and emits visible light excited by ultraviolet light or short-wavelength visible light emitted by the light-emitting element 24.
The optical wavelength conversion unit 52 includes: a main light emitting surface 54; and a subsidiary light emission surface 56 having substantially the same area as the main light emission surface 54. The main light emitting surface 54 has a surface with a concave-convex shape. Fig. 7(a) is a diagram showing a case of total reflection of light in a case where the emission surface is a flat surface, and fig. 7(b) is a diagram showing a case where light is emitted in a case where the emission surface is an uneven surface.
As shown in fig. 7(a), when the refractive index n1 of the light wavelength conversion section 52 is larger than the refractive index n2(≈ 1) of air, light incident on the main light emission surface 32 at an angle larger than the critical angle θ is totally reflected and cannot be emitted to the outside. On the other hand, as shown in fig. 7(b), a part of light directed toward the main light output surface 54 at an angle larger than the critical angle θ can obtain an incident angle smaller than the critical angle θ when the part of light enters the concave-convex surface. Therefore, by providing the concave-convex surface on the surface like the main light emission surface 54, the light extraction efficiency at the main light emission surface 54 is improved, and the amount of light emitted is relatively increased compared to the sub light emission surface 56 which is a flat surface.
In this way, the light wavelength conversion unit 52 according to the present embodiment is configured to increase the light extraction efficiency of the main light emission surface 54 to be higher than that of the sub light emission surface 56, so that more converted light obtained by converting ultraviolet light or short-wavelength visible light by the phosphor 30 is emitted from the main light emission surface 54.
Therefore, the optical wavelength conversion unit 52 is configured to: the peak direction D2 of the intensity of the emitted visible light is different from the peak direction D1 of the intensity of the ultraviolet light or short-wavelength visible light emitted by the light-emitting element. Accordingly, since the directivity of the visible light emitted from the light wavelength conversion unit 52 is different from the directivity of the ultraviolet light or the short-wavelength visible light emitted from the light emitting element 24, the light emitting module 50 having a directivity characteristic different from that of the light source, i.e., the light emitting element 24 itself can be realized.
The concavo-convex surface preferably has an Ra (surface roughness) in the range of 5 μm to several mm. More preferably, Ra is about 10 μm to 5 mm. The uneven surface may be formed by transferring an uneven surface provided on the mold itself, or may be formed by molding and then reworking.
Fig. 8(a) to 8(f) show an example of the convex portion on the concave-convex surface. The convex part may be: a rectangular parallelepiped (fig. 8(a)), a hemispherical shape (fig. 8(b)), a conical shape (fig. 8(c)), a triangular pyramid, a polygonal pyramid, a truncated cone, a truncated pyramid, a bell shape, and the like. In addition, it may be: a quadrangular prism shape having a rectangular or trapezoidal cross section (fig. 8 d), a semicircular and semicircular semi-cylindrical shape having a semicircular cross section (fig. 8 e), and a triangular prism shape having a triangular cross section (fig. 8 f). This increases the efficiency of extracting light from the main light emitting surface of the optical wavelength conversion unit.
Fig. 9(a) and 9(b) show an example of a concave portion on the concave-convex surface. The concave portion is formed by recessing a shape corresponding to the convex portion. For example, the grooves may be hemispherical pits (fig. 9(a)) or semi-cylindrical grooves (fig. 9 (b)). This increases the efficiency of extracting light from the main light emitting surface of the optical wavelength conversion unit.
The uneven surface may be a mixture of different types of concave and convex portions, or different types of concave and convex portions may be arranged regularly or randomly.
(embodiment 3)
In the light emitting module 20 according to embodiment 1, the main light emitting surface 54 according to embodiment 2 may be used instead of the main light emitting surface 32. Accordingly, the amount of light emitted from the main light emission surface is relatively larger than the amount of light emitted from the sub light emission surface, and therefore, the direction to be the peak of the directivity characteristic can be further brought closer to the direction perpendicular to the main light emission surface.
(embodiment 4)
Fig. 10(a) is a side view of a light-emitting module according to embodiment 4, and fig. 10(b) is a side view of a light-emitting module according to a modification of embodiment 4.
In the light emitting module 60 shown in fig. 10(a), the light wavelength conversion section 62 does not directly seal the light emitting element 24, as compared with the light emitting module 20 according to embodiment 1. The optical wavelength conversion unit 62 may be a single member having an L-shaped cross section, or may be formed by combining a plurality of plate-shaped members. The thickness t of the optical wavelength conversion part 62 is in the range of 0.1 to 10mm, preferably in the range of about 1 to 3 mm.
The optical wavelength conversion unit 62 includes a plurality of plate-shaped transmission members arranged in a non-parallel manner with respect to the substrate 22, or the optical wavelength conversion unit 62 includes a transmission member 28, and the transmission member 28 includes a plurality of emission surfaces (main light emission surface 32, sub light emission surface 34) arranged in a non-parallel manner with respect to the substrate 22. In the light emitting module 60, the light emitting element 24 and the light wavelength conversion unit 62 are spaced apart from each other, and the space therebetween is filled with air. Instead of air, silicone resin, glass, or the like containing no phosphor may be filled in the space. In addition, the transmittance of the filled material for light emitted from the light-emitting element may be 50% or more.
When the space is filled in this way, the optical wavelength conversion unit 62 includes: a transmission member 28 that is in contact with silicone or glass sealing the light-emitting surface 24a of the light-emitting element 24 and transmits ultraviolet light or short-wavelength visible light; and a phosphor 30 contained in the transmission member 28. Thus, the optical wavelength conversion unit 62 having a directivity different from the directivity of the light emitting element 24 can be realized with a simple configuration.
The light emitting module 70 shown in fig. 10(b) is the same as the light emitting module 50 according to embodiment 2 except for the configuration of the light wavelength conversion section 72. The light wavelength conversion section 72 does not directly seal the light-emitting surface 24a of the light-emitting element 24.
(embodiment 5)
Fig. 11(a) is a side view of a light-emitting module according to embodiment 5, fig. 11(b) is a side view of a light-emitting module according to a modification of embodiment 5, and fig. 11(c) is a side view of a light-emitting module according to another modification of embodiment 5.
The light-emitting module 80 shown in fig. 11(a) is mainly different from the light-emitting module 20 according to embodiment 1 in that: the light wavelength conversion section 26 is separated from the substrate 22 without sealing the light emitting element 24.
The light emitting module 90 shown in fig. 11(b) is mainly different from the light emitting module 60 according to embodiment 4 in that the light wavelength conversion section 62 is separated from the substrate 22.
The light emitting module 110 shown in fig. 11(c) is mainly different from the light emitting module 90 shown in fig. 11(b) in that a reflecting member 64 is provided, and the reflecting member 64 reflects light emitted sideways from the light emitting surface 24a of the light emitting element 24 toward the light wavelength conversion portion 62. This allows light emitted from the light emitting element 24 to be guided to the optical wavelength conversion unit 62 without waste.
The light-transmitting member 28 in the light wavelength conversion section 62 is disposed away from the substrate 22 so that the relative radiation intensity of ultraviolet light or short-wavelength visible light emitted from the light-emitting element 24 is within a range of radiation angles (± 55 ° to 70 °) of 0.5 or more. Thus, since the ultraviolet light or short-wavelength visible light emitted from the light emitting element 24 can be made incident on the entire transmission member 28, the difference in luminance in the light emitting surfaces (the main light output surface 32 and the sub light output surface 34) of the light wavelength conversion section 62 that emits visible light can be reduced.
(embodiment 6)
Fig. 12 is a side view of the light-emitting module according to embodiment 6. The light emitting module 120 shown in fig. 12 is different from the light emitting module 60 according to embodiment 4 mainly in that an uneven surface is formed on the main light emitting surface 54 of the optical wavelength conversion unit 74, and an uneven surface is also formed on the incident surface 76 on the opposite side of the sub light emitting surface 34.
In particular, by the operation of the uneven surface formed on the incident surface 76, a part of the converted light emitted from the fluorescent material 30 included in the light wavelength conversion unit 74 is returned from the incident surface 76 to the internal space 78, and is emitted again from the main light emission surface 54 to the outside, whereby the amount of light emitted from the main light emission surface 54 can be increased.
According to the light emitting module of each of the above embodiments, the slope and the size of the emission surface of the light wavelength conversion unit are designed to obtain the directivity characteristic different from the directivity characteristic of the light emitting element. In particular, since the converted light formed by the phosphor included in the optical wavelength conversion unit is nondirectional light (isotropic light), the intensity of the converted light in the direction (optical axis) perpendicular to the emission surface is large. Therefore, by utilizing such characteristics, even when the light emitting surfaces of the light emitting elements themselves are oriented in the same direction, the shape of main light emitting surface 32 is designed, and thus light emitting modules of various light distributions can be realized.
(7 th embodiment)
Fig. 13 is a side view of the light-emitting module according to embodiment 7. In the light emitting module 130, the plurality of light emitting elements 24 are aligned on the substrate 22, and the light emitting elements 24 are sealed by the wavelength conversion section 82. The optical wavelength conversion section 82 has 4 main light emission surfaces 84a to 84d, but the slope of each main light emission surface is formed so as to gradually change toward the outside (the left side in the drawing). Thus, the light emitting module 130 can realize a wide range of light distribution from the vehicle front-rear direction X to the vehicle width direction W. Note that the main light emitting surfaces 84a and 84b may have the same slope, and the main light emitting surfaces 84c and 84d may have the same slope.
(embodiment 8)
Fig. 14 is a schematic view of the vehicular lamp according to embodiment 8. The vehicle lamp 200 includes a light emitting module 140 and a reflector 86. The light emitting module 140 can increase the amount of light emitted from the main light emitting surface 32 by devising the configuration of the main light emitting surface 32. Thus, even if the length of the reflecting mirror 86 is set short, a sufficient amount of light can be emitted from the light emitting module 140 toward the reflecting mirror 86.
Although the present invention has been described above with reference to the above embodiments and examples, the present invention is not limited to the above embodiments, and configurations obtained by appropriately combining or replacing the configurations of the embodiments are also included in the present invention. Further, modifications such as rearrangement of the combination and order of processes in the embodiments and addition of various design changes to the embodiments can be made as appropriate based on the knowledge of those skilled in the art, and embodiments to which such modifications are added are also included in the scope of the present invention.
Claims (10)
1. A light-emitting module is characterized in that,
the disclosed device is provided with:
a substrate;
a light emitting element disposed on the substrate and emitting ultraviolet or short-wavelength visible light; and
a light wavelength conversion unit that is provided on a light emitting surface side of the light emitting element and emits visible light excited by ultraviolet light or short-wavelength visible light emitted from the light emitting element,
the optical wavelength conversion unit is configured to: the light wavelength conversion unit emits visible light having an intensity peak direction different from that of the ultraviolet light or short-wavelength visible light emitted from the light emitting element, so that the light wavelength conversion unit emits visible light having a directivity different from that of the ultraviolet light or short-wavelength visible light emitted from the light emitting element.
2. The lighting module of claim 1,
the light wavelength conversion section is disposed such that an emission surface from which visible light is emitted is inclined with respect to a light emission surface of the light emitting element,
the exit surface is disposed substantially perpendicular to the direction of the intensity peak of the exiting visible light.
3. Light emitting module according to claim 1 or 2,
the optical wavelength conversion unit includes:
a transmission member that seals a light emitting surface of the light emitting element, or that is in contact with a member that seals the light emitting surface of the light emitting element and transmits ultraviolet light or short-wavelength visible light; and
a phosphor contained in the transmissive member.
4. Light emitting module according to claim 1 or 2,
the wavelength conversion unit includes:
a plurality of plate-shaped transmission members arranged in a non-parallel manner with respect to the substrate, or having a plurality of emission surfaces that are not parallel with respect to the substrate; and
a phosphor contained in the transmission member,
the transmissive member is configured to exit from the light emitting element.
5. The lighting module of claim 4,
the transmission member is disposed so as to exit from the substrate to be included in a range of radiation angles of 0.5 or more relative radiation intensities of ultraviolet rays or short-wavelength visible light emitted from the light emitting element.
6. Light emitting module according to claim 1 or 2,
the optical wavelength conversion unit includes: a main light emitting surface; and a sub-light emitting surface of the light guide plate,
the main light exit face is arranged substantially perpendicular with respect to the direction of the intensity peak of the emitted visible light.
7. The lighting module of claim 6,
a plurality of the main light emitting surfaces and a plurality of the sub light emitting surfaces are alternately arranged on an upper surface of the optical wavelength conversion unit,
the sum of the plurality of main light emission surfaces is larger than the sum of the plurality of sub light emission surfaces.
8. The lighting module of claim 7,
the inclination angles of the plurality of main light emitting surfaces are formed to gradually change as going outward.
9. The lighting module of claim 7,
the main light emitting surface has a surface formed with a concave-convex shape.
10. The lighting module of claim 4,
the light emitting device is provided with a reflecting member that reflects light emitted from the light emitting surface of the light emitting element to the side surface toward the optical wavelength conversion unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018017322A JP2019134128A (en) | 2018-02-02 | 2018-02-02 | Light-emitting module |
| JP2018-017322 | 2018-02-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110131683A CN110131683A (en) | 2019-08-16 |
| CN110131683B true CN110131683B (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910099505.0A Active CN110131683B (en) | 2018-02-02 | 2019-01-31 | Light emitting module |
| CN201920174816.4U Active CN209638932U (en) | 2018-02-02 | 2019-01-31 | Light emitting module |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920174816.4U Active CN209638932U (en) | 2018-02-02 | 2019-01-31 | Light emitting module |
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| CN (2) | CN110131683B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007311423A (en) * | 2006-05-16 | 2007-11-29 | Alps Electric Co Ltd | Light emitting substance and its manufacturing method |
| CN102132412A (en) * | 2008-06-27 | 2011-07-20 | 布里奇勒科思股份有限公司 | Surface-textured encapsulations for use with light emitting diodes |
| CN103090319A (en) * | 2012-12-20 | 2013-05-08 | 康佳集团股份有限公司 | Lamp bar of liquid crystal display (LCD) television and directly-down type backlight module |
| JP2013251080A (en) * | 2012-05-30 | 2013-12-12 | Toshiba Corp | Lighting device |
| CN104175578A (en) * | 2014-07-08 | 2014-12-03 | 华南师范大学 | Manufacturing method of LED fluorescent powder prefabricated film |
-
2018
- 2018-02-02 JP JP2018017322A patent/JP2019134128A/en active Pending
-
2019
- 2019-01-31 CN CN201910099505.0A patent/CN110131683B/en active Active
- 2019-01-31 CN CN201920174816.4U patent/CN209638932U/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007311423A (en) * | 2006-05-16 | 2007-11-29 | Alps Electric Co Ltd | Light emitting substance and its manufacturing method |
| CN102132412A (en) * | 2008-06-27 | 2011-07-20 | 布里奇勒科思股份有限公司 | Surface-textured encapsulations for use with light emitting diodes |
| JP2013251080A (en) * | 2012-05-30 | 2013-12-12 | Toshiba Corp | Lighting device |
| CN103090319A (en) * | 2012-12-20 | 2013-05-08 | 康佳集团股份有限公司 | Lamp bar of liquid crystal display (LCD) television and directly-down type backlight module |
| CN104175578A (en) * | 2014-07-08 | 2014-12-03 | 华南师范大学 | Manufacturing method of LED fluorescent powder prefabricated film |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110131683A (en) | 2019-08-16 |
| JP2019134128A (en) | 2019-08-08 |
| CN209638932U (en) | 2019-11-15 |
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