WO2023189747A1 - Composant de source de lumière monté sur véhicule et lampe de véhicule - Google Patents

Composant de source de lumière monté sur véhicule et lampe de véhicule Download PDF

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Publication number
WO2023189747A1
WO2023189747A1 PCT/JP2023/010651 JP2023010651W WO2023189747A1 WO 2023189747 A1 WO2023189747 A1 WO 2023189747A1 JP 2023010651 W JP2023010651 W JP 2023010651W WO 2023189747 A1 WO2023189747 A1 WO 2023189747A1
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Prior art keywords
light
wavelength
vehicle
light source
integrated intensity
Prior art date
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PCT/JP2023/010651
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English (en)
Japanese (ja)
Inventor
雄壮 前野
久芳 大長
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株式会社小糸製作所
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Publication of WO2023189747A1 publication Critical patent/WO2023189747A1/fr

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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
    • F21S41/141—Light emitting diodes [LED]
    • 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
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • 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
    • F21V9/38—Combination of two or more photoluminescent elements of different materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present disclosure relates to a vehicle-mounted light source component and a vehicle lamp.
  • Patent Document 1 discloses a vehicle headlamp and its LED light source that can ensure visibility and visibility when the road surface is wet, such as in rainy weather, or in dense fog or snow.
  • the white LED light source currently used in vehicle headlamps combines a semiconductor light emitting element that emits blue light with a peak wavelength of 460 nm and a phosphor that converts the blue light into yellow light with a peak wavelength of 565 nm. Most commonly, a blue-yellow pseudo-white composition is adopted.
  • a blue-yellow pseudo-white composition is adopted.
  • An object of the present disclosure is to provide a vehicle-mounted light source component that can improve visibility when driving a vehicle at night, and a vehicle lamp equipped with the vehicle-mounted light source component.
  • An in-vehicle light source component includes: In the spectroscopic spectrum, white light is emitted in which the ratio of the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less is 12% or more.
  • a vehicle lamp according to one aspect of the present disclosure includes the vehicle-mounted light source component described above.
  • an in-vehicle light source component that can improve visibility when driving a vehicle at night, and a vehicle lamp that includes the in-vehicle light source component.
  • FIG. 1 is a schematic cross-sectional view of an in-vehicle light source component according to an embodiment.
  • FIG. 7 is a schematic cross-sectional view of an in-vehicle light source component according to another embodiment.
  • FIG. 2 is a diagram showing emission spectra, scotopic luminous efficiencies, and photopic luminous efficiencies of Example 1 and Comparative Example 1.
  • FIG. 2 is a diagram showing the chromaticity of Example 1, Comparative Example 1, and Reference Examples 1 to 4 in a CIE chromaticity diagram.
  • FIG. 1 is a schematic cross-sectional view of an in-vehicle light source component 1A.
  • the vehicle-mounted light source component 1A includes at least a light source 10 on a substrate 2.
  • the board 2 is, for example, a printed circuit board on which a predetermined wiring pattern (not shown) is printed.
  • the light source 10 placed on the substrate 2 is electrically connected to the wiring pattern via, for example, a conductive wire (not shown).
  • the light source 10 includes a semiconductor light emitting device 11 and a wavelength conversion section 12A that converts the wavelength of light emitted from the semiconductor light emitting device.
  • the semiconductor light emitting device 11 is a light emitting device that emits blue light.
  • a blue LED Light Emitting Diode
  • a blue LED device including an InGaN layer can be mentioned.
  • the semiconductor light emitting device 11 emits blue light having a dominant wavelength of 430 nm to 480 nm.
  • dominant wavelength refers to the extension from the white point (0.333, 0.333) on the CIE chromaticity diagram (CIExy chromaticity diagram) to the chromaticity coordinates that indicate the chromaticity of the material. This is the wavelength of monochromatic light indicated by the intersection of the straight line and the outer circumferential line of the CIE chromaticity diagram.
  • the wavelength conversion section 12A is composed of a binder 13 and a wavelength conversion material 14.
  • Binder 13 is provided on semiconductor light emitting device 11 .
  • the binder 13 supports the wavelength conversion material 14 in a state where the wavelength conversion material 14 is dispersed inside the binder 13 .
  • the material for the binder 13 is not particularly limited, but organic resin materials, inorganic amorphous materials, inorganic sol-gel materials, ceramic materials, etc. can be used.
  • the binder 13 transmits the light emitted from the semiconductor light emitting device 11 and the wavelength-converted light whose wavelength has been converted by the wavelength conversion material 14, and specifically, the transmittance of these lights must be 80% or more. is preferred.
  • the wavelength conversion material 14 is composed of a green light emitting material 14g and an orange light emitting material 14a that convert the wavelength of blue light emitted from the semiconductor light emitting device 11.
  • the green light emitting material 14g absorbs blue light emitted from the semiconductor light emitting element 11 and emits green light.
  • the green light-emitting material 14g is used from the viewpoint of enhancing the spectrum in the wavelength range of 480 to 530 nm, which has high scotopic luminous efficiency.
  • the green light-emitting material 14g is not particularly limited, but includes, for example, Lu 3 Al 5 O 12 : Ce 3+ , ⁇ -SiAlON:Eu 2+ , Y 3 (Al,Ga) 5 O 12 :Ce 3+ , Ca 3 SiO 4 Cl 2 :Eu 2+ , Ba 5 Si 2 O 6 Cl 6 :Eu 2+ , SrSi 2 O 2 N 2 :Eu 2+ , CaSc 2 O 4 :Ce 4+ , Ca 3 Sc 2 Si 3 O 12 :Ce 4+ , (Ba,Sr) 2 SiO 4 :Eu 2+ , BaSi 2 O 2 N 2 :Eu 2+ , La 3 Br(SiS 4 ) 2 :Ce 3+ , BaSi 7 N 10 :Eu 2+ ,RE 2 Si 4 N 6 C:Ce 3+ , Ca 2 LaZr 2 Ga 3 O 12 :Ce 3+ , LuCa 2 Hf
  • Examples include phosphors that absorb blue light and emit green light. In order to enhance the spectrum in the wavelength range of 480 to 530 nm, which has high scotopic luminous efficiency, it is preferable that the wavelength converter 12A contains one or more of these green-emitting phosphors.
  • the orange light emitting material 14a absorbs the blue light emitted from the semiconductor light emitting element 11 and emits orange light.
  • the orange light emitting material 14a is used from the viewpoint of adjusting the white chromaticity range by mixing the blue light of the semiconductor light emitting element 11 and the green light of the green light emitting material 14g.
  • the orange light emitting material 14a absorbs the blue light emitted from the semiconductor light emitting element 11 and emits light having a main wavelength of 580 nm to 600 nm.
  • orange light-emitting material 14a examples include, but are not limited to, ⁇ -SiAlON:Eu 2+ , Sr 3 Y 2 Ge 3 O 12 :Eu 2+ , (Y,Gd) 3 Al 5 O 12 :Ce 3+ , Examples include phosphors that absorb blue light and emit orange light, such as Ba 2 Mg(BO 3 ) 2 :Eu 2+ and Y 3 Si 5 N 9 O:Eu 2+ .
  • the green light-emitting material 14g and the orange light-emitting material 14a may be composed of quantum dots in addition to the phosphors illustrated.
  • the green light emitting material 14g and the orange light emitting material 14a can be mounted on the semiconductor light emitting element 11 by mixing these two types of material powders and using transparent resin or low melting point glass as the binder 13.
  • each material powder can be dispersed in a transparent resin or low melting point glass, then molded into a sheet, and stacked on top of each other to mount the green luminescent material 14g and the orange luminescent material 14a.
  • FIG. 2 shows a schematic cross-sectional view of an in-vehicle light source component 1B according to another embodiment.
  • the vehicle-mounted light source component 1B has the same configuration as the vehicle-mounted light source component 1A except for the wavelength conversion section 12B. Similar configurations are given the same reference numerals and explanations will be omitted.
  • the wavelength conversion section 12B of the vehicle-mounted light source component 1B is composed of a green wavelength conversion layer 12g and an orange wavelength conversion layer 12a.
  • the green wavelength conversion layer 12g is a layer in which a green light emitting material 14g is dispersed in a first binder 13g.
  • the orange wavelength conversion layer 12a is a layer in which an orange luminescent material 14a is dispersed in a second binder 13a.
  • the first binder 13g and the second binder 13a may be the same or different, and may have the same configuration as the binder 13 described above.
  • the green light-emitting material 14g and the orange light-emitting material 14a can be sintered into a plate shape, and then mounted by overlapping them. There is no particular regulation on the order of stacking, including the example shown in FIG. 2, but if it is mounted so that the orange wavelength conversion layer 12a is on the bottom and the green wavelength conversion layer 12g is on the top, multiple excitation between the wavelength conversion materials can be suppressed. This is preferable because the white LED light emission color is stable.
  • the on-vehicle light source components 1A and 1B emit white light in which the ratio of the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less is 12% or more in the spectrum.
  • the white light has a chromaticity within a region (region Rw in FIG. 4, which will be described later) defined as white in automotive lamps on the CIE chromaticity diagram.
  • the vehicle-mounted light source components 1A and 1B emit white light in which the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less is 25% or less of the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less in the spectroscopic spectrum. preferable.
  • the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less is 25% or less of the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less.
  • the in-vehicle light source components 1A and 1B emit white light in which the ratio of the integrated intensity of light with a wavelength of 610 nm or more and 780 nm or less to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less is 5% or more in the spectroscopic spectrum. .
  • the ratio of the integrated intensity of light with a wavelength of 610 nm to 780 nm to the integrated intensity of light with a wavelength of 380 nm to 780 nm to 5% or more the chromaticity of white light falls within the white chromaticity range required for vehicle lamps. , or a chromaticity close to the required white chromaticity range.
  • the vehicle lamp according to the embodiment is not particularly limited as long as it includes the above-described vehicle-mounted light source components 1A and 1B, for example.
  • the above-mentioned in-vehicle light source parts 1A and 1B can be used, for example, as headlamps, fog lamps, position lamps, rear combination lamps, turn signal lamps of automobiles, or to inform pedestrians and drivers of other vehicles of the status of their own vehicle (for example, autonomous driving). It can be suitably used for various lamps etc. that notify that the vehicle is running.
  • the surface of a black irradiated object becomes a discontinuous point for the propagation of light, which is a type of electromagnetic wave, and a scattering phenomenon occurs in which the traveling direction of light is disrupted on the surface of the irradiated object. It is thought that the outline is slightly visible. In addition, when viewing a black irradiated object at night, it becomes a ⁇ black irradiated object'' in a background color of ⁇ black,'' so the receptivity of the rod cells of the eyes, which are highly sensitive to light, is important. it is conceivable that.
  • the scotopic luminous efficiency is 0.8 in the scotopic luminous efficiency curve, which corresponds to the sensitivity of the rod cells of the eye.
  • the integrated intensity of light having a wavelength of 480 nm or more and 530 nm or less is relatively low.
  • the vehicle-mounted light source components 1A and 1B in the embodiment are white, in which the ratio of the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less is 12% or more. It is configured to emit light.
  • the visibility of the irradiated object can be improved, and in particular, the visibility of the irradiated object that is close to black can be improved.
  • the intensity of light with a shorter wavelength is higher than that of yellow light in the blue-yellow pseudo white, the intensity of light with a short wavelength that can be expected to have a large refractive index increases, and the light with high scotopic luminosity increases. It is thought that the amount of scattered light from the irradiator increases, further improving visibility.
  • the vehicle-mounted light source components 1A and 1B in the embodiment include a semiconductor light emitting device 11 that emits blue light, and a green light emitting material 14g and an orange light emitting material 14a that convert the wavelength of the blue light emitted from the semiconductor light emitting device 11.
  • wavelength converters 12A and 12B By adopting a blue-green-orange pseudo-white composition, the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less, with a scotopic luminous efficiency of 0.8 or more, is higher than the conventional blue-yellow pseudo white composition. It is elevated.
  • Example 1 A semiconductor light-emitting element emitting light at a dominant wavelength of 447 nm and having each side of 1 mm was flip-chip mounted on an aluminum nitride substrate provided with a gold power supply pattern using gold bumps.
  • a green-emitting phosphor Lu 3 Al 5 O 12 :Ce 3+ (emission dominant wavelength: 546 nm) and an orange-emitting phosphor ⁇ -SiAlON:Eu (emission dominant wavelength: 591 nm) were mixed at a weight ratio of 5:4.
  • the obtained mixed phosphor was dispersed in dimethyl silicone resin at a concentration of 6 vol % and defoamed.
  • the obtained phosphor-dispersed silicone resin was applied onto a semiconductor light emitting device to a thickness of 150 ⁇ m and cured, thereby producing the vehicle light source component of Example 1.
  • the emission spectrum of the in-vehicle light source component of Example 1 was evaluated using CAS140D manufactured by Instrument Systems.
  • the obtained spectrum (spectrum with code EX1) is shown in FIG.
  • the scotopic luminous efficiency (the line indicated by the symbol DLF) and the photopic luminous efficiency (the line indicated by the symbol BLF) are also shown. Note that the scotopic luminous efficiency and the photopic luminous efficiency are normalized and shown so that the sensitivity at the peak wavelength is 1.
  • the chromaticity of light emitted by the in-vehicle light source component of Example 1 is plotted and shown in the CIE chromaticity diagram of FIG. 4 (plot with symbol EX1).
  • the area labeled Rw indicates an area defined as white in the automotive lamp.
  • the plot of symbol A in FIG. 4 shows the peak wavelength of scotopic luminous efficiency in the CIE chromaticity diagram
  • the plot of symbol B in FIG. This shows the chromaticity when
  • Table 1 shows the ratio and the ratio of the integrated intensity of light with a wavelength of 610 nm or more and 780 nm or less to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less.
  • Example 1 A semiconductor light emitting device mounted product similar to that in Example 1 was prepared, and a yellow phosphor (Y,Gd) 3 Al 5 O 12 :Ce (emission dominant wavelength: 500 nm) was dispersed in dimethyl silicone resin at a concentration of 6 vol%. Defoamed. The obtained phosphor-dispersed silicone resin was applied onto a semiconductor light emitting device to a thickness of 150 ⁇ m and cured, thereby producing a vehicle light source component of Comparative Example 1.
  • the emission spectrum of the vehicle-mounted light source component of Comparative Example 1 was evaluated in the same manner as in Example 1. Note that the input current was adjusted so that the number of emitted photons was the same as in the evaluation in Example 1.
  • the obtained spectrum (spectrum labeled CE1) is shown in FIG.
  • the chromaticity (cx, cy) of the light emitted by the automotive light source component of Comparative Example 1 in the CIE chromaticity diagram and the integrated intensity of light with a wavelength of 480 nm or more and 530 nm or less with respect to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less.
  • Table 1 shows the ratio and the ratio of the integrated intensity of light with a wavelength of 610 nm or more and 780 nm or less to the integrated intensity of light with a wavelength of 380 nm or more and 780 nm or less.
  • Example 1 From the results shown in FIG. 3 and Table 1, it was confirmed that the relative luminous flux 1 of Example 1 was improved by 15% compared to Comparative Example 1, and the visibility of objects such as pedestrians was improved in a dark place. In particular, it can be expected that the visibility of "black irradiated objects" against a "black” background color, such as pedestrians wearing black clothes, will be further improved.
  • the ratio of the integrated intensity of the spectrum in the wavelength range (480 to 530 nm) with high dark visibility sensitivity was 19.70% in Example 1, while it was 10.8% in Comparative Example 1.
  • Example 1 had approximately twice the amount of light in this wavelength range.
  • Example 1 the intensity of light with a shorter wavelength than that of yellow light in the blue-yellow pseudo white is increased, so the intensity of light with a short wavelength that can be expected to have a large refractive index increases, and It is thought that the amount of scattered light from the highly sensitive irradiated object increases, further improving visibility.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
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Abstract

L'invention concerne un composant de source de lumière monté sur véhicule (1A) émettant une lumière blanche dans laquelle le rapport d'intensité intégrée de lumière ayant une longueur d'onde de 480 nm -530 nm sur une intensité intégrée de lumière ayant une longueur d'onde de 380 nm -780 nm est de 12 % ou plus dans un spectre de spectroscopie.
PCT/JP2023/010651 2022-03-28 2023-03-17 Composant de source de lumière monté sur véhicule et lampe de véhicule WO2023189747A1 (fr)

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JP2022-051499 2022-03-28
JP2022051499 2022-03-28

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016093119A1 (fr) * 2014-12-09 2016-06-16 信越化学工業株式会社 Source lumineuse à del pour phare monté sur un véhicule

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016093119A1 (fr) * 2014-12-09 2016-06-16 信越化学工業株式会社 Source lumineuse à del pour phare monté sur un véhicule

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