WO2023189746A1 - Holder member and vehicle lamp - Google Patents

Holder member and vehicle lamp Download PDF

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Publication number
WO2023189746A1
WO2023189746A1 PCT/JP2023/010649 JP2023010649W WO2023189746A1 WO 2023189746 A1 WO2023189746 A1 WO 2023189746A1 JP 2023010649 W JP2023010649 W JP 2023010649W WO 2023189746 A1 WO2023189746 A1 WO 2023189746A1
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WO
WIPO (PCT)
Prior art keywords
holder member
polypropylene material
light
light guide
vehicle lamp
Prior art date
Application number
PCT/JP2023/010649
Other languages
French (fr)
Japanese (ja)
Inventor
智彦 杉山
弘明 原
和弘 伊藤
正知 小林
Original Assignee
株式会社小糸製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Publication of WO2023189746A1 publication Critical patent/WO2023189746A1/en

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Classifications

    • 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
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/237—Light guides characterised by the shape of the light guide rod-shaped
    • 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
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/241—Light guides characterised by the shape of the light guide of complex shape
    • 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
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/27—Attachment thereof
    • 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
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/33—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors characterised by their material, surface treatment or coatings
    • 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
    • F21S43/40—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors
    • 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
    • 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
    • F21W2102/30—Fog lights
    • 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
    • F21W2103/00—Exterior vehicle lighting devices for signalling purposes
    • F21W2103/10—Position lights
    • 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
    • F21W2103/00—Exterior vehicle lighting devices for signalling purposes
    • F21W2103/20—Direction indicator lights
    • 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
    • F21W2104/00—Exterior vehicle lighting devices for decorative purposes
    • 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
    • F21W2105/00—Combinations of lighting devices covered by codes F21W2102/00 – F21W2104/00

Definitions

  • the present disclosure relates to a holder member and a vehicle lamp.
  • Patent Document 1 discloses a vehicle lamp that includes a lens having a light guide portion and a direct radiation portion.
  • Patent Document 2 discloses a vehicle lamp that includes a light guide and a holder that holds the light guide.
  • resin materials such as polycarbonate, which have excellent dimensional stability and weather resistance, have been used for holders that hold light guides. Furthermore, the holder was made of white polycarbonate in order to function as a reflector to reflect the light emitted from the light guide.
  • polycarbonate has low fluidity and tends to increase in thickness when forming a complex and large member, leading to concerns that the weight will increase.
  • An object of the present disclosure is to provide a lightweight holder member and a vehicle lamp that have a reflector function.
  • a holder member includes: a recess configured to hold a light guide and reflect light emitted from the light guide; It is made of polypropylene material that has a reflectance of 70% or more for light with a wavelength of 400 to 700 nm.
  • a holder member that holds a long light guide and has a concave portion that is configured to reflect light emitted from the light guide has a size corresponding to the length of the light guide. Therefore, if a resin material with low fluidity is used, the member will be thick and the weight will increase. Even if a resin material with a high specific gravity is used, the weight will increase. Since the polypropylene material has a low specific gravity and exhibits high fluidity during molding, the holder member having a reflector function can be made thin and lightweight.
  • a vehicle lamp according to one aspect of the present disclosure includes the holder member described above.
  • FIG. 1 is a diagram showing a vehicle lamp according to an embodiment. It is a figure showing a 1st holder member. It is a figure showing a 2nd holder member. It is a figure showing a 3rd holder member. It is a figure which shows the 4th holder member. It is a figure which shows the 5th holder member.
  • FIG. 1 is a partial cross-sectional view showing a vehicle lamp 1 including a holder member 10.
  • the vehicle lamp 1 includes a lamp body 22 and a transparent outer cover 24 that covers a front opening of the lamp body 22.
  • the lamp body 22 and the outer cover 24 form a lamp chamber 26.
  • the vehicle lamp 1 includes a holder member 10, a light guide 20, and a lens 28 in a lamp chamber 26.
  • the light guide 20 is a long rod-shaped member, and is a "light guide section" that allows light from a light source (not shown) to enter from an end surface and guides the light, while emitting a part of the light through a step formed inside. ”.
  • the light guide 20 is not particularly limited, it is preferable that no filler is added thereto. Further, the light guide 20 is preferably made of a thermoplastic resin having a total light transmittance of 85% or more at a thickness of 3 mm, although it is not particularly limited.
  • the light guide 20 is held in a recess 12 provided in the holder member 10.
  • the lens 28 is arranged between the light guide 20 held in the recess 12 and the outer cover 24.
  • the vehicle lamp 1 according to the embodiment is not particularly limited as long as it includes the holder member 10 according to the embodiment described below, for example.
  • the vehicle lamp 1 according to the embodiment can be used, for example, as a headlamp, a fog lamp, a position lamp, a rear combination lamp, a turn signal lamp of an automobile, or to provide information to pedestrians or drivers of other vehicles about the status of the own vehicle (for example, autonomous driving). It can be suitably used for various types of lamps etc. that inform the user that the device is inside.
  • the first holder member 10A is a member made of a polypropylene material having a reflectance of 70% or more for light having a wavelength of 400 to 700 nm.
  • the first holder member 10A holds a long light guide and includes a recess 12 configured to be able to reflect light emitted from the light guide. Since the recess 12 is made of a polypropylene material having the above reflectance, it can reflect the light emitted from the light guide held in the recess 12. Further, the first holder member 10A includes an edge 14 that frames an opening 15 configured to allow insertion of another member.
  • Various members may be arranged so that light from a light source other than the light source that makes light enter the light guide is emitted from the opening 15.
  • the opening 15 is provided approximately at the center of the first holder member 10A.
  • the recess 12 is provided along at least a portion of the edge 14. Specifically, the recesses 12 are provided at two locations along the edge 14 so as to sandwich the opening 15 in the height direction (vertical direction in FIG. 2) of the first holder member 10A.
  • the first holder member 10A includes a bracket portion 16 that can be fixed to a vehicle lamp on the outer peripheral portion of the first holder member 10A.
  • the first holder member 10A may include a component fixing portion that can fix other components to the first holder member 10A at a portion other than the recess 12, the edge 14, and the bracket portion 16.
  • the polypropylene material constituting the first holder member 10A may be a homopolymer, a copolymer, a block polymer, a random polymer, or the like, but preferably a polypropylene material composed of a homopolymer and a copolymer.
  • a polypropylene material having a reflectance of 70% or more for light with a wavelength of 400 to 700 nm is a white material.
  • reflectance refers to the sum of regular reflectance and diffuse reflectance.
  • the polypropylene material it is preferable to use one having a regular reflectance of 3% or more (average wavelength: 400 to 700 nm, mold polishing #3000).
  • the polypropylene material may contain various additives in the base resin material.
  • the material white may contain a white pigment.
  • a white pigment titanium oxide, aluminum oxide, zinc white, lithopone, lead white, etc. may be used, but it is preferable to use titanium oxide, which is excellent in light-shielding properties, reflective properties, and cost.
  • the preferred particle size of titanium oxide is 50 nm or more and 500 nm or less, and the amount added is preferably 0.5 wt% or more and 10 wt% or less based on the entire polypropylene material.
  • the polypropylene material constituting the first holder member 10A includes a reinforcing material, the bending elastic modulus of the polypropylene material is 2 GPa or more and 5 GPa or less, and the load deflection temperature of the polypropylene material under a bending stress of 0.45 MPa is 120° C. or more and 140° C. It is preferable that it is below.
  • a polypropylene material By employing such a polypropylene material, excellent strength and heat resistance can be ensured in the first holder member 10A having a reflector function.
  • the reinforcing material talc, glass fiber, calcium carbonate, mica, wollastenite, etc. may be used, but it is preferable to use talc, which is superior in heat resistance, dimensional accuracy, and cost.
  • the preferred particle size of talc is a side length of 1 ⁇ m or more and 30 ⁇ m or less, and a thickness of 10 nm or more and 500 nm or less, and the amount added is preferably 10 wt% or more and 40 wt% or less based on the entire polypropylene material.
  • the polypropylene material constituting the first holder member 10A preferably contains an ultraviolet absorber, a light stabilizer, or both.
  • an ultraviolet absorber preferably contains an ultraviolet absorber, a light stabilizer, or both.
  • excellent weather resistance can be ensured in the first holder member 10A having a reflector function.
  • ultraviolet absorbers and light stabilizers those having a melting point of 120° C. or higher are preferred.
  • an ultraviolet absorber or light stabilizer with a melting point of 120° C. or higher the weather resistance of the reflective material can be improved without causing fogging of the lamp lens.
  • Ultraviolet absorbers are not particularly limited, but include 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2,2'-methylenebis[6-( 2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], 2-(5-chloro-2H-benzotriazol-2-yl)-6-tert-butyl -4-methylphenol, 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine, and the like.
  • Light stabilizers include, but are not particularly limited to, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)butane-1,2,3,4-tetracarboxylate, 2,2,6,6-tetra Examples include methylpiperidin-4-yl-hexadecanoate, 2,2,6,6-tetramethylpiperidin-4-yl-octadecenoate, and the like.
  • the amount of the ultraviolet absorber, the light stabilizer, or both added is preferably 0.02 wt% or more and 3 wt% or less based on the entire polypropylene material. When the amount added is within this range, the weather resistance of the polypropylene material is improved, the occurrence of cracks on the surface of the polypropylene material is suppressed, and the reflectance can be maintained.
  • the polypropylene material constituting the first holder member 10A preferably has a specific gravity of 0.89 g/cm 3 or more and 1.00 g/cm 3 or less. Further, the polypropylene material preferably has an MFR (230° C., 21N) of 3 g/10 min or more. Polypropylene materials with such physical properties have a lower specific gravity and higher fluidity than conventional polycarbonate materials, so they can be molded into complex shapes and large parts with reduced weight.
  • the polypropylene material constituting the first holder member 10A has a color with a yellowness YI in the range of -10 to -0.4.
  • upconversion nanoparticles that absorb light with a wavelength longer than 640 nm and emit light around 475 nm may be used to suppress yellowing. By using such upconversion nanoparticles, it is possible to suppress the reflected light from being yellowish, and it is possible to emit light with a bluish tint.
  • the polypropylene material constituting the first holder member 10A has a specific gravity of 1.0 g/cm 3 or more and 1.3 g/cm 3 or less, a bending modulus of 2 GPa or more and 5 GPa or less, and an MFR (230° C., 21 N) of 3 g/10 min or more and 30 g. /10 min or less, a molding shrinkage rate of 1.0% or more and 1.5% or less, and a deflection temperature under load with respect to a bending stress of 0.45 MPa of 120°C or more and 140°C or less.
  • Table 1 shows the evaluation results of various physical properties of white polypropylene materials (PP white) with varying amounts of talc.
  • the white polypropylene material is composed of a homopolymer and a copolymer, and 0.5 to 5 wt% of pigment is added.
  • the specific gravity of each item was measured using an electronic hydrometer according to ISO 1183. MFR was determined in accordance with ISO 7111 at 230°C and 21N. The flexural modulus was measured using an autograph according to ISO 178.
  • the molding shrinkage rate was determined from the dimensions of a 2 mm thick 61 mm x 61 mm flat plate.
  • the deflection temperature under load was measured using an automatic HDT test device in accordance with ISO 75-2.
  • the regular reflectance was evaluated using a spectrophotometer in accordance with ISO 7724-1 (JIS Z8722) at an average wavelength of 400 to 700 nm and an incident angle and a reflection angle of 8°.
  • the molded product was molded using mold polishing #3000.
  • Table 2 shows the evaluation results of various reflectances, transmittances, and spiral fluidities of the white polypropylene material and the white polycarbonate material.
  • the white polypropylene material is composed of a homopolymer and a copolymer, and 0.5 to 5 wt% of pigment is added. Pigment is added to the white polycarbonate material in an amount of 5 to 10 wt%. Specular reflectance and diffuse reflectance are measured using a spectrophotometer according to ISO 7724-1 (JIS Z8722), mold polishing #3000, average wavelength of 400 to 700 nm, incident angle, and reflection angle. Evaluation was made under the condition of 8°.
  • Transmittance was evaluated based on the average wavelength of 400 to 700 nm in a 2 mm thick flat plate sample according to ISO 11664-1.
  • Spiral fluidity is determined by forming a 2 mm thick spiral test piece, measuring the length (L) of the test piece with a caliper, and calculating the ratio of the length of the test piece to the thickness (T: 2 mm) (L/ T) was calculated. Evaluation was made under the conditions of an injection speed of 50 mm/s and an injection pressure of 100 MPa.
  • the resin temperature was 210°C and the mold temperature was 40°C for the polypropylene material, and the resin temperature was 280°C and the mold temperature was 80°C for the polycarbonate material.
  • the first holder member 10A has a concave portion 12 configured to hold a long light guide 20 and reflect light emitted from the light guide 20.
  • the size will increase accordingly. Therefore, if a resin material with low fluidity is used, the member will be thick and the weight will increase. Even if a resin material with a high specific gravity is used, the weight will increase.
  • the polypropylene material constituting the first holder member 10A has a low specific gravity and exhibits high fluidity during molding, so the first holder member 10A having a reflector function can be made thin and lightweight.
  • the first holder member includes an edge 14 that frames an opening 15 configured to allow insertion of another member, and a recess 12 having a reflector function is provided along at least a portion of the edge 14.
  • 10A has a more complicated shape. Therefore, if a resin material with low fluidity is used, the member will become even thicker and its weight will further increase.
  • the first holder member 10A having such a complicated shape by using the above-mentioned specific polypropylene material, the first holder member 10A having a reflector function with a light specific gravity and a small thickness can be suitably configured.
  • the first holder member 10A which becomes large according to the length of the light guide 20, is provided with a bracket portion 16 that can be fixed to the vehicle lamp 1, so that it can be attached to the vehicle lamp 1 to increase rigidity. I can do it.
  • the lightweight first holder member 10A can make the vehicle lamp 1 lightweight while increasing its rigidity.
  • the second holder member 10B is a member made of the same polypropylene material as that described for the first holder member 10A.
  • the second holder member 10B has a different shape from the first holder member 10A, but has the same functions as the recess 12, the edge 14 surrounding the opening 15, and the bracket 16 described in the first holder member 10A. has. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect.
  • the opening 15 is provided slightly laterally shifted from the center portion of the second holder member 10B.
  • the recess 12 of the second holder member 10B is provided along at least a portion of the edge 14.
  • the recesses 12 of the second holder member 10B include two short recesses 12 arranged so as to rest on the shoulders of the opening 15, and one arranged along approximately half of the edge 14 of the opening 15. and one long recess 12.
  • the third holder member 10C is a member made of the same polypropylene material as that described for the first holder member 10A.
  • the third holder member 10C has a different shape from the first holder member 10A, but has the same functions as the recess 12, the edge 14 surrounding the opening 15, and the bracket part 16 described in the first holder member 10A. has. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect.
  • the opening 15 is provided approximately at the center of the third holder member 10C.
  • the opening 15 is provided so that a portion thereof extends close to the end of the third holder member 10C.
  • the recess 12 of the third holder member 10C is provided along at least a portion of the edge 14.
  • the recess 12 of the third holder member 10C includes a recess 12 along one side of the edge 14 of the opening 15 and a recess 12 arranged along approximately half of the edge 14 of the opening 15. , consists of.
  • the fourth holder member 10D is a member made of the same polypropylene material as that described for the first holder member 10A.
  • the fourth holder member 10D has a different shape from the first holder member 10A, but has portions that have the same functions as the recess 12 and bracket portion 16 described in the first holder member 10A. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect.
  • the fourth holder member 10D does not have a bordered opening.
  • the fourth holder member 10D includes one short recess 12 along the outer edge of the fourth holder member 10D and one long recess 12 along the inner edge of the fourth holder member 10D.
  • the fifth holder member 10E is a member made of the same polypropylene material as that described for the first holder member 10A. Although the fifth holder member 10E has a different shape from the first holder member 10A, it has portions that have the same functions as the recess 12 and the bracket portion 16 described in the first holder member 10A. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect. Note that the fifth holder member 10E does not have a bordered opening.
  • the fifth holder member 10E includes one recess 12 along the outer edge of the fifth holder member 10E.
  • a mode in which a propylene material is used has been described, but for example, a polycarbonate material whose molecular weight is controlled to improve fluidity during molding may be applied to thinly mold a complex-shaped holder member having a reflector function. It is also possible. In this case, it is also possible to apply the configuration shown in the above propylene material. However, from the viewpoint of the light weight and cost of the propylene material itself, it is preferable to construct the holder member from a propylene material.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A holder member (10) comprises: a polypropylene member including a recessed part (12) that is configured to hold a light guide and be able to reflect light emitted from the light guide, wherein the reflectivity of light having a wavelength of 400 to 700 nm is 70% or greater.

Description

ホルダ部材および車両用灯具Holder members and vehicle lights
　本開示は、ホルダ部材および車両用灯具に関する。 The present disclosure relates to a holder member and a vehicle lamp.
　特許文献１は、導光部と直射部を有するレンズを備える車両用灯具を開示する。特許文献２は、導光体と導光体を保持するホルダを備える車両用灯具を開示する。 Patent Document 1 discloses a vehicle lamp that includes a lens having a light guide portion and a direct radiation portion. Patent Document 2 discloses a vehicle lamp that includes a light guide and a holder that holds the light guide.
日本国特開２０２０‐２０５１９３号公報Japanese Patent Application Publication No. 2020-205193 日本国特開２０１６‐１３４３２３号公報Japanese Patent Application Publication No. 2016-134323
　従来、導光体を保持するホルダには寸法安定性や耐候性に優れるポリカーボネートなどの樹脂材料が採用されていた。また、ホルダには、導光体から放出される光を反射するリフレクタの機能を持たせるために、白色のポリカーボネートが採用されていた。しかしながら、ポリカーボネートは流動性が低く、複雑で大型な部材を形成する際に厚みが大きくなる傾向があり、重量が大きくなる懸念がある。 Conventionally, resin materials such as polycarbonate, which have excellent dimensional stability and weather resistance, have been used for holders that hold light guides. Furthermore, the holder was made of white polycarbonate in order to function as a reflector to reflect the light emitted from the light guide. However, polycarbonate has low fluidity and tends to increase in thickness when forming a complex and large member, leading to concerns that the weight will increase.
　本開示は、リフレクタの機能を備える軽量なホルダ部材および車両用灯具を提供することを目的とする。 An object of the present disclosure is to provide a lightweight holder member and a vehicle lamp that have a reflector function.
　本開示の一側面に係るホルダ部材は、
　ライトガイドを保持し、前記ライトガイドから放出される光を反射可能に構成された凹部を備え、
　波長４００～７００ｎｍの光の反射率が７０％以上であるポリプロピレン材から構成される。 A holder member according to one aspect of the present disclosure includes:
a recess configured to hold a light guide and reflect light emitted from the light guide;
It is made of polypropylene material that has a reflectance of 70% or more for light with a wavelength of 400 to 700 nm.
　長尺のライトガイドを保持し、ライトガイドから放出される光を反射可能に構成された凹部を備えるホルダ部材は、ホルダ部材自体もライトガイドの長さに応じて大型となる。そのため、流動性の低い樹脂材料を使用すると厚みの大きい部材となり重量が増えてしまう。比重の大きい樹脂材料を採用しても重量が増えてしまう。上記ポリプロピレン材は比重が小さく、成形時に高い流動性を示すため、リフレクタの機能を備えるホルダ部材を厚みの小さい軽量のものにできる。 A holder member that holds a long light guide and has a concave portion that is configured to reflect light emitted from the light guide has a size corresponding to the length of the light guide. Therefore, if a resin material with low fluidity is used, the member will be thick and the weight will increase. Even if a resin material with a high specific gravity is used, the weight will increase. Since the polypropylene material has a low specific gravity and exhibits high fluidity during molding, the holder member having a reflector function can be made thin and lightweight.
　本開示の一側面に係る車両用灯具は、上記ホルダ部材を備える。 A vehicle lamp according to one aspect of the present disclosure includes the holder member described above.
　本開示によれば、リフレクタの機能を備える軽量なホルダ部材および車両用灯具を提供できる。 According to the present disclosure, it is possible to provide a lightweight holder member and a vehicle lamp that have a reflector function.
実施形態に係る車両用灯具を示す図である。FIG. 1 is a diagram showing a vehicle lamp according to an embodiment. 第１ホルダ部材を示す図である。It is a figure showing a 1st holder member. 第２ホルダ部材を示す図である。It is a figure showing a 2nd holder member. 第３ホルダ部材を示す図である。It is a figure showing a 3rd holder member. 第４ホルダ部材を示す図である。It is a figure which shows the 4th holder member. 第５ホルダ部材を示す図である。It is a figure which shows the 5th holder member.
　以下、図面を参照しつつ本開示の実施形態について詳細に説明する。尚、本図面に示された各部材の寸法は、説明の便宜上、実際の各部材の寸法とは異なる場合がある。 Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the dimensions of each member shown in this drawing may differ from the actual dimensions of each member for convenience of explanation.
　まず、図１を参照して、実施形態に係る車両用灯具１を説明する。図１は、ホルダ部材１０を備える車両用灯具１を示す部分断面図である。車両用灯具１は、ランプボディ２２と、ランプボディ２２の前面開口部を覆う透明なアウターカバー２４とを備える。ランプボディ２２およびアウターカバー２４は、灯室２６を形成している。
　車両用灯具１は、灯室２６内にホルダ部材１０とライトガイド２０とレンズ２８とを備えている。ライトガイド２０は長尺の棒状の部材であり、図示を省略する光源からの光を端面から入射させて導光しながら、内部に形成されたステップにより光の一部を出射させる「導光部」として機能する。ライトガイド２０は、特に限定されないが、フィラーが添加されていないものであると好ましい。また、ライトガイド２０は、特に限定されないが、厚さ３ｍｍにおける全光線透過率が８５％以上の熱可塑性樹脂で構成されると好ましい。ライトガイド２０はホルダ部材１０に設けられた凹部１２に保持されている。レンズ２８は凹部１２に保持されたライトガイド２０とアウターカバー２４の間に配置されている。 First, with reference to FIG. 1, a vehicle lamp 1 according to an embodiment will be described. FIG. 1 is a partial cross-sectional view showing a vehicle lamp 1 including a holder member 10. As shown in FIG. The vehicle lamp 1 includes a lamp body 22 and a transparent outer cover 24 that covers a front opening of the lamp body 22. The lamp body 22 and the outer cover 24 form a lamp chamber 26.
The vehicle lamp 1 includes a holder member 10, a light guide 20, and a lens 28 in a lamp chamber 26. The light guide 20 is a long rod-shaped member, and is a "light guide section" that allows light from a light source (not shown) to enter from an end surface and guides the light, while emitting a part of the light through a step formed inside. ”. Although the light guide 20 is not particularly limited, it is preferable that no filler is added thereto. Further, the light guide 20 is preferably made of a thermoplastic resin having a total light transmittance of 85% or more at a thickness of 3 mm, although it is not particularly limited. The light guide 20 is held in a recess 12 provided in the holder member 10. The lens 28 is arranged between the light guide 20 held in the recess 12 and the outer cover 24.
　実施形態に係る車両用灯具１は、例えば、後述する実施形態に係るホルダ部材１０を備えるものであれば、特に限定されない。実施形態に係る車両用灯具１は、例えば、自動車のヘッドランプ、フォグランプ、ポジションランプ、リヤコンビネーションランプ、ターンシグナルランプ、又は、歩行者や他車両のドライバーに自車両の状況（例えば、自動運転走行中であること）を知らせる各種ランプ等に好適に用いることができる。 The vehicle lamp 1 according to the embodiment is not particularly limited as long as it includes the holder member 10 according to the embodiment described below, for example. The vehicle lamp 1 according to the embodiment can be used, for example, as a headlamp, a fog lamp, a position lamp, a rear combination lamp, a turn signal lamp of an automobile, or to provide information to pedestrians or drivers of other vehicles about the status of the own vehicle (for example, autonomous driving). It can be suitably used for various types of lamps etc. that inform the user that the device is inside.
　続いて、図２を参照して、実施形態に係る第１ホルダ部材１０Ａを説明する。第１ホルダ部材１０Ａは、波長４００～７００ｎｍの光の反射率が７０％以上であるポリプロピレン材から構成される部材である。第１ホルダ部材１０Ａは、長尺のライトガイドを保持し、ライトガイドから放出される光を反射可能に構成された凹部１２を備える。凹部１２は、上記反射率のポリプロピレン材で構成されているため、凹部１２に保持されたライトガイドから出射される光を反射できる。
　また、第１ホルダ部材１０Ａは、他の部材を挿通可能に構成された開口部１５を縁取る縁部１４を備える。ライトガイドに光を入射させる光源とは別の光源からの光が開口部１５から出射されるように、各種部材を配置してもよい。開口部１５は第１ホルダ部材１０Ａの略中央部分に設けられている。凹部１２は縁部１４の少なくとも一部に沿って設けられている。具体的には、凹部１２は開口部１５を第１ホルダ部材１０Ａの高さ方向（図２における上下方向）において挟み込むように縁部１４に沿って２箇所で設けられている。
　また、第１ホルダ部材１０Ａは、第１ホルダ部材１０Ａの外周部分に、車両用灯具に固定可能とされたブラケット部１６を備える。第１ホルダ部材１０Ａは、凹部１２、縁部１４およびブラケット部１６以外の部分で、他の部品を第１ホルダ部材１０Ａに固定可能とされた部品固定部を備えてもよい。 Next, with reference to FIG. 2, the first holder member 10A according to the embodiment will be described. The first holder member 10A is a member made of a polypropylene material having a reflectance of 70% or more for light having a wavelength of 400 to 700 nm. The first holder member 10A holds a long light guide and includes a recess 12 configured to be able to reflect light emitted from the light guide. Since the recess 12 is made of a polypropylene material having the above reflectance, it can reflect the light emitted from the light guide held in the recess 12.
Further, the first holder member 10A includes an edge 14 that frames an opening 15 configured to allow insertion of another member. Various members may be arranged so that light from a light source other than the light source that makes light enter the light guide is emitted from the opening 15. The opening 15 is provided approximately at the center of the first holder member 10A. The recess 12 is provided along at least a portion of the edge 14. Specifically, the recesses 12 are provided at two locations along the edge 14 so as to sandwich the opening 15 in the height direction (vertical direction in FIG. 2) of the first holder member 10A.
Further, the first holder member 10A includes a bracket portion 16 that can be fixed to a vehicle lamp on the outer peripheral portion of the first holder member 10A. The first holder member 10A may include a component fixing portion that can fix other components to the first holder member 10A at a portion other than the recess 12, the edge 14, and the bracket portion 16.
　第１ホルダ部材１０Ａを構成するポリプロピレン材は、ホモポリマー、コポリマー、ブロックポリマー、ランダムポリマー等のポリプロピレン材を採用できるが、ホモポリマーとコポリマーで構成されるポリプロピレン材であると好ましい。波長４００～７００ｎｍの光の反射率が７０％以上であるポリプロピレン材は白色の材料である。ここで「反射率」とは、正反射率と拡散反射率の合計を指す。ポリプロピレン材としては、正反射率が３％以上（波長：４００～７００ｎｍの平均、金型磨き♯３０００）のものを用いると好ましい。
　ポリプロピレン材は、母材となる樹脂材料に各種添加剤を含むものでもよい。白色の材料とする観点で、白色顔料を含むものでもよい。白色顔料としては、酸化チタン、酸化アルミニウム、亜鉛華、リトポン、鉛白等を採用してもよいが、遮光性や反射性、コスト面に優れる酸化チタンを採用することが好ましい。酸化チタンの好ましい粒子サイズは５０ｎｍ以上５００ｎｍ以下であり、添加量はポリプロピレン材全体に対して０．５ｗｔ％以上１０ｗｔ％以下であると好ましい。上記処方にすることで漏光防止を可能にしつつ、部品統合もできて軽量化も実現できる。 The polypropylene material constituting the first holder member 10A may be a homopolymer, a copolymer, a block polymer, a random polymer, or the like, but preferably a polypropylene material composed of a homopolymer and a copolymer. A polypropylene material having a reflectance of 70% or more for light with a wavelength of 400 to 700 nm is a white material. Here, "reflectance" refers to the sum of regular reflectance and diffuse reflectance. As the polypropylene material, it is preferable to use one having a regular reflectance of 3% or more (average wavelength: 400 to 700 nm, mold polishing #3000).
The polypropylene material may contain various additives in the base resin material. From the viewpoint of making the material white, it may contain a white pigment. As the white pigment, titanium oxide, aluminum oxide, zinc white, lithopone, lead white, etc. may be used, but it is preferable to use titanium oxide, which is excellent in light-shielding properties, reflective properties, and cost. The preferred particle size of titanium oxide is 50 nm or more and 500 nm or less, and the amount added is preferably 0.5 wt% or more and 10 wt% or less based on the entire polypropylene material. By using the above prescription, it is possible to prevent light leakage, while also allowing components to be integrated and reducing weight.
　第１ホルダ部材１０Ａを構成するポリプロピレン材は、強化材を含み、ポリプロピレン材の曲げ弾性率が２ＧＰａ以上５ＧＰａ以下であり、ポリプロピレン材の０．４５ＭＰａの曲げ応力に対する荷重たわみ温度が１２０℃以上１４０℃以下であると好ましい。このようなポリプロピレン材を採用することで、リフレクタの機能を備える第１ホルダ部材１０Ａにおいて優れた強度と耐熱性を確保できる。強化材としては、タルク、ガラスファイバー、炭酸カルシウム、マイカ、ワラステナイト等を採用してもよいが、耐熱性向上や寸法精度向上、コスト面に優れるタルクを採用することが好ましい。タルクの好ましい粒子サイズは辺の長さ１μｍ以上３０μｍ以下、厚み１０ｎｍ以上５００ｎｍ以下であり、添加量はポリプロピレン材全体に対して１０ｗｔ％以上４０ｗｔ％以下が好ましい。 The polypropylene material constituting the first holder member 10A includes a reinforcing material, the bending elastic modulus of the polypropylene material is 2 GPa or more and 5 GPa or less, and the load deflection temperature of the polypropylene material under a bending stress of 0.45 MPa is 120° C. or more and 140° C. It is preferable that it is below. By employing such a polypropylene material, excellent strength and heat resistance can be ensured in the first holder member 10A having a reflector function. As the reinforcing material, talc, glass fiber, calcium carbonate, mica, wollastenite, etc. may be used, but it is preferable to use talc, which is superior in heat resistance, dimensional accuracy, and cost. The preferred particle size of talc is a side length of 1 μm or more and 30 μm or less, and a thickness of 10 nm or more and 500 nm or less, and the amount added is preferably 10 wt% or more and 40 wt% or less based on the entire polypropylene material.
　第１ホルダ部材１０Ａを構成するポリプロピレン材は、紫外線吸収剤、光安定剤またはその両方を含むと好ましい。紫外線吸収剤、光安定剤またはその両方を含むポリプロピレン材を採用することで、リフレクタの機能を備える第１ホルダ部材１０Ａにおいて、優れた耐候性を確保できる。紫外線吸収剤、光安定剤として融点が１２０℃以上のものが好ましい。１２０℃以上の融点を有する紫外線吸収剤や光安定剤を使用することで、ランプのレンズ曇りを発生させることなく、反射材料の耐候性を向上できる。
　紫外線吸収剤としては特に限定されないが、２－（２Ｈ－ベンゾトリアゾール－２－イル）－４，６－ビス（１－メチル－１－フェニルエチル）フェノール、２，２’－メチレンビス［６－（２Ｈ－ベンゾトリアゾール－２－イル）－４－（１，１，３，３－テトラメチルブチル）フェノール］、２－（５－クロロ－２Ｈ－ベンゾトリアゾール－２－イル）－６－ｔｅｒｔ－ブチル－４－メチルフェノール、２，４，６－トリス（２－ヒドロキシ－４－ヘキシロキシ－３－メチルフェニル）－１，３，５－トリアジン等が挙げられる。光安定剤としては特に限定されないが、テトラキス（２，２，６，６－テトラメチル－４－ピペリジル）ブタン－１，２，３，４－テトラカルボキシレイト、２，２，６，６－テトラメチルピペリジン－４－イル－ヘキサデカノエイト、２，２，６，６－テトラメチルピペリジン－４－イル－オクタデセノエイト等が挙げられる。
　紫外線吸収剤、光安定剤またはその両方の添加量は、ポリプロピレン材全体に対して０．０２ｗｔ％以上３ｗｔ％以下が好ましい。添加量がこの範囲であると、ポリプロピレン材の耐候性が向上し、ポリプロピレン材表面へのクラックの発生が抑制され、反射率を維持できる。 The polypropylene material constituting the first holder member 10A preferably contains an ultraviolet absorber, a light stabilizer, or both. By employing a polypropylene material containing an ultraviolet absorber, a light stabilizer, or both, excellent weather resistance can be ensured in the first holder member 10A having a reflector function. As ultraviolet absorbers and light stabilizers, those having a melting point of 120° C. or higher are preferred. By using an ultraviolet absorber or light stabilizer with a melting point of 120° C. or higher, the weather resistance of the reflective material can be improved without causing fogging of the lamp lens.
Ultraviolet absorbers are not particularly limited, but include 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2,2'-methylenebis[6-( 2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], 2-(5-chloro-2H-benzotriazol-2-yl)-6-tert-butyl -4-methylphenol, 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine, and the like. Light stabilizers include, but are not particularly limited to, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)butane-1,2,3,4-tetracarboxylate, 2,2,6,6-tetra Examples include methylpiperidin-4-yl-hexadecanoate, 2,2,6,6-tetramethylpiperidin-4-yl-octadecenoate, and the like.
The amount of the ultraviolet absorber, the light stabilizer, or both added is preferably 0.02 wt% or more and 3 wt% or less based on the entire polypropylene material. When the amount added is within this range, the weather resistance of the polypropylene material is improved, the occurrence of cracks on the surface of the polypropylene material is suppressed, and the reflectance can be maintained.
　第１ホルダ部材１０Ａを構成するポリプロピレン材は、比重が０．８９ｇ／ｃｍ３以上１．００ｇ／ｃｍ３以下であると好ましい。また、ポリプロピレン材は、ＭＦＲ（２３０℃、２１Ｎ）が３ｇ／１０ｍｉｎ以上であると好ましい。このような物性のポリプロピレン材は従来のポリカーボネート材に比べて比重が小さく流動性も高いため、複雑な形状や大型の部品を軽量にして成形することができる。 The polypropylene material constituting the first holder member 10A preferably has a specific gravity of 0.89 g/cm 3 or more and 1.00 g/cm 3 or less. Further, the polypropylene material preferably has an MFR (230° C., 21N) of 3 g/10 min or more. Polypropylene materials with such physical properties have a lower specific gravity and higher fluidity than conventional polycarbonate materials, so they can be molded into complex shapes and large parts with reduced weight.
　第１ホルダ部材１０Ａを構成するポリプロピレン材は、黄色度ＹＩが－１０～－０．４の範囲に入る色味であると好ましい。また、添加剤として、６４０ｎｍよりも長波長の光を吸収して４７５ｎｍ付近に発光するアップコンバージョンナノ粒子を用いて黄色味を抑えてもよい。このようなアップコンバージョンナノ粒子を用いることで反射光に黄色味が帯びることを抑制でき、青色味を帯びた発光にすることができる。 It is preferable that the polypropylene material constituting the first holder member 10A has a color with a yellowness YI in the range of -10 to -0.4. Further, as an additive, upconversion nanoparticles that absorb light with a wavelength longer than 640 nm and emit light around 475 nm may be used to suppress yellowing. By using such upconversion nanoparticles, it is possible to suppress the reflected light from being yellowish, and it is possible to emit light with a bluish tint.
　第１ホルダ部材１０Ａを構成するポリプロピレン材は、比重１．０ｇ／ｃｍ３以上１．３ｇ／ｃｍ３以下、曲げ弾性率が２ＧＰａ以上５ＧＰａ以下、ＭＦＲ（２３０℃、２１Ｎ）が３ｇ／１０ｍｉｎ以上３０ｇ／１０ｍｉｎ以下、成形収縮率が１．０％以上１．５％以下、０．４５ＭＰａの曲げ応力に対する荷重たわみ温度が１２０℃以上１４０℃以下であると好ましい。 The polypropylene material constituting the first holder member 10A has a specific gravity of 1.0 g/cm 3 or more and 1.3 g/cm 3 or less, a bending modulus of 2 GPa or more and 5 GPa or less, and an MFR (230° C., 21 N) of 3 g/10 min or more and 30 g. /10 min or less, a molding shrinkage rate of 1.0% or more and 1.5% or less, and a deflection temperature under load with respect to a bending stress of 0.45 MPa of 120°C or more and 140°C or less.
　表１にタルクの配合量を変化させた白色ポリプロピレン材（ＰＰ白）の各種物性値の評価結果を示す。なお、白色ポリプロピレン材はホモポリマーとコポリマーで構成されており、顔料は０．５～５ｗｔ％添加されている。また、各項目について、比重は、ＩＳＯ　１１８３に従い、電子比重計を用いて測定した。ＭＦＲは、ＩＳＯ　７１１１に従い、２３０℃２１Ｎの条件で求めた。曲げ弾性率は、ＩＳＯ　１７８に従い、オートグラフを用いて測定した。成形収縮率は、２ｍｍ厚６１ｍｍ×６１ｍｍ平板の寸法から求めた。荷重たわみ温度は、ＩＳＯ　７５－２に従い、自動ＨＤＴ試験装置を用いて測定した。正反射率は、ＩＳＯ　７７２４－１（ＪＩＳ　Ｚ８７２２）に従い、分光測色計を用いて波長４００～７００ｎｍの平均、入射角および反射角８°の条件で評価した。なお成形品は金型磨き♯３０００で成形した。 Table 1 shows the evaluation results of various physical properties of white polypropylene materials (PP white) with varying amounts of talc. Note that the white polypropylene material is composed of a homopolymer and a copolymer, and 0.5 to 5 wt% of pigment is added. Further, the specific gravity of each item was measured using an electronic hydrometer according to ISO 1183. MFR was determined in accordance with ISO 7111 at 230°C and 21N. The flexural modulus was measured using an autograph according to ISO 178. The molding shrinkage rate was determined from the dimensions of a 2 mm thick 61 mm x 61 mm flat plate. The deflection temperature under load was measured using an automatic HDT test device in accordance with ISO 75-2. The regular reflectance was evaluated using a spectrophotometer in accordance with ISO 7724-1 (JIS Z8722) at an average wavelength of 400 to 700 nm and an incident angle and a reflection angle of 8°. The molded product was molded using mold polishing #3000.
Figure JPOXMLDOC01-appb-T000001
  
Figure JPOXMLDOC01-appb-T000001
  
　表２に白色ポリプロピレン材と白色ポリカーボネート材の各種反射率、透過率およびスパイラル流動性の評価結果を示す。なお、白色ポリプロピレン材は、ホモポリマーとコポリマーで構成されており、顔料は０．５～５ｗｔ％添加されている。白色ポリカーボネート材には、顔料は５～１０ｗｔ％添加されている。正反射率および拡散反射率は、正反射率は、ＩＳＯ　７７２４－１（ＪＩＳ　Ｚ８７２２）に従い、分光測色計を用いて、金型磨き♯３０００、波長４００～７００ｎｍの平均、入射角および反射角８°の条件で評価した。透過率は、ＩＳＯ １１６６４-１に従い、２ｍｍ厚平板のサンプルにおける波長４００～７００ｎｍの平均で評価した。スパイラル流動性は、２ｍｍ厚スパイラル試験片を成形し、試験片の長さ（Ｌ）をノギスで測定して、試験片の厚さ（Ｔ：２ｍｍ）に対する試験片の長さの比（Ｌ／Ｔ）を算出した。射出速度５０ｍｍ／ｓ、射出圧力１００ＭＰａの条件で評価した。またスパイラル流動性の評価において、ポリプロピレン材では樹脂温度２１０℃、型温度４０℃として、ポリカーボネート材では樹脂温度２８０℃、型温度８０℃とした。 Table 2 shows the evaluation results of various reflectances, transmittances, and spiral fluidities of the white polypropylene material and the white polycarbonate material. Note that the white polypropylene material is composed of a homopolymer and a copolymer, and 0.5 to 5 wt% of pigment is added. Pigment is added to the white polycarbonate material in an amount of 5 to 10 wt%. Specular reflectance and diffuse reflectance are measured using a spectrophotometer according to ISO 7724-1 (JIS Z8722), mold polishing #3000, average wavelength of 400 to 700 nm, incident angle, and reflection angle. Evaluation was made under the condition of 8°. Transmittance was evaluated based on the average wavelength of 400 to 700 nm in a 2 mm thick flat plate sample according to ISO 11664-1. Spiral fluidity is determined by forming a 2 mm thick spiral test piece, measuring the length (L) of the test piece with a caliper, and calculating the ratio of the length of the test piece to the thickness (T: 2 mm) (L/ T) was calculated. Evaluation was made under the conditions of an injection speed of 50 mm/s and an injection pressure of 100 MPa. In the evaluation of spiral fluidity, the resin temperature was 210°C and the mold temperature was 40°C for the polypropylene material, and the resin temperature was 280°C and the mold temperature was 80°C for the polycarbonate material.
Figure JPOXMLDOC01-appb-T000002
  
Figure JPOXMLDOC01-appb-T000002
  
　長尺のライトガイド２０を保持し、ライトガイド２０から放出される光を反射可能に構成された凹部１２を備える第１ホルダ部材１０Ａは、第１ホルダ部材１０Ａ自体もライトガイド２０の長さに応じて大型となる。そのため、流動性の低い樹脂材料を使用すると厚みの大きい部材となり重量が増えてしまう。比重の大きい樹脂材料を採用しても重量が増えてしまう。第１ホルダ部材１０Ａを構成する上記ポリプロピレン材は比重が小さく、成形時に高い流動性を示すため、リフレクタの機能を備える第１ホルダ部材１０Ａを厚みの小さい軽量のものにできる。 The first holder member 10A has a concave portion 12 configured to hold a long light guide 20 and reflect light emitted from the light guide 20. The size will increase accordingly. Therefore, if a resin material with low fluidity is used, the member will be thick and the weight will increase. Even if a resin material with a high specific gravity is used, the weight will increase. The polypropylene material constituting the first holder member 10A has a low specific gravity and exhibits high fluidity during molding, so the first holder member 10A having a reflector function can be made thin and lightweight.
　また、他の部材を挿通可能に構成された開口部１５を縁取る縁部１４を備え、リフレクタの機能を備える凹部１２が縁部１４の少なくとも一部に沿って設けられている第１ホルダ部材１０Ａは、形状がより複雑になる。そのため、流動性の低い樹脂材料を使用するとさらに厚みの大きい部材となり重量がさらに増えてしまう。このような複雑な形状の第１ホルダ部材１０Ａにおいて、上記の特定のポリプロピレン材を用いることで、比重の軽い材料で厚みの小さいリフレクタの機能を備える第１ホルダ部材１０Ａを好適に構成できる。 Further, the first holder member includes an edge 14 that frames an opening 15 configured to allow insertion of another member, and a recess 12 having a reflector function is provided along at least a portion of the edge 14. 10A has a more complicated shape. Therefore, if a resin material with low fluidity is used, the member will become even thicker and its weight will further increase. In the first holder member 10A having such a complicated shape, by using the above-mentioned specific polypropylene material, the first holder member 10A having a reflector function with a light specific gravity and a small thickness can be suitably configured.
　また、ライトガイド２０の長さに応じて大型となる第１ホルダ部材１０Ａが車両用灯具１に固定可能とされたブラケット部１６を備えることで、車両用灯具１に取り付けられて剛性を高めることができる。これにより、軽量な第１ホルダ部材１０Ａによって車両用灯具１を軽量にしつつも剛性を高めることができる。 Further, the first holder member 10A, which becomes large according to the length of the light guide 20, is provided with a bracket portion 16 that can be fixed to the vehicle lamp 1, so that it can be attached to the vehicle lamp 1 to increase rigidity. I can do it. Thereby, the lightweight first holder member 10A can make the vehicle lamp 1 lightweight while increasing its rigidity.
　続いて、図３を参照して、実施形態に係る第２ホルダ部材１０Ｂを説明する。第２ホルダ部材１０Ｂは、第１ホルダ部材１０Ａにおいて説明したものと同じポリプロピレン材から構成される部材である。第２ホルダ部材１０Ｂは、第１ホルダ部材１０Ａと形状が異なるが、第１ホルダ部材１０Ａで説明した、凹部１２、開口部１５を縁取る縁部１４、及びブラケット部１６と同じ機能を備える部分を有する。これらの部分については第１ホルダ部材１０Ａでのものと同一の符号を付して、態様の異なる点を除いて詳細な説明を省略する。
　第２ホルダ部材１０Ｂでは、開口部１５は第２ホルダ部材１０Ｂの中央部分から若干横にずらして設けられている。第２ホルダ部材１０Ｂの凹部１２は縁部１４の少なくとも一部に沿って設けられている。具体的には、第２ホルダ部材１０Ｂの凹部１２は、開口部１５の肩にかかるように配置された２つの短い凹部１２と、開口部１５の縁部１４の略半分に沿うように配置された１つの長い凹部１２と、で構成される。 Next, with reference to FIG. 3, the second holder member 10B according to the embodiment will be described. The second holder member 10B is a member made of the same polypropylene material as that described for the first holder member 10A. The second holder member 10B has a different shape from the first holder member 10A, but has the same functions as the recess 12, the edge 14 surrounding the opening 15, and the bracket 16 described in the first holder member 10A. has. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect.
In the second holder member 10B, the opening 15 is provided slightly laterally shifted from the center portion of the second holder member 10B. The recess 12 of the second holder member 10B is provided along at least a portion of the edge 14. Specifically, the recesses 12 of the second holder member 10B include two short recesses 12 arranged so as to rest on the shoulders of the opening 15, and one arranged along approximately half of the edge 14 of the opening 15. and one long recess 12.
　続いて、図４を参照して、実施形態に係る第３ホルダ部材１０Ｃを説明する。第３ホルダ部材１０Ｃは、第１ホルダ部材１０Ａにおいて説明したものと同じポリプロピレン材から構成される部材である。第３ホルダ部材１０Ｃは、第１ホルダ部材１０Ａと形状が異なるが、第１ホルダ部材１０Ａで説明した、凹部１２、開口部１５を縁取る縁部１４、及びブラケット部１６と同じ機能を備える部分を有する。これらの部分については第１ホルダ部材１０Ａでのものと同一の符号を付して、態様の異なる点を除いて詳細な説明を省略する。
　第３ホルダ部材１０Ｃでは、開口部１５は第３ホルダ部材１０Ｃの略中央部分に設けられている。また、開口部１５はその一部が第３ホルダ部材１０Ｃの端部の近くまで延びるように設けられている。第３ホルダ部材１０Ｃの凹部１２は縁部１４の少なくとも一部に沿って設けられている。具体的には、第３ホルダ部材１０Ｃの凹部１２は、開口部１５の縁部１４の一辺に沿う凹部１２と、開口部１５の縁部１４の略半分に沿うように配置された凹部１２と、で構成される。 Next, with reference to FIG. 4, the third holder member 10C according to the embodiment will be described. The third holder member 10C is a member made of the same polypropylene material as that described for the first holder member 10A. The third holder member 10C has a different shape from the first holder member 10A, but has the same functions as the recess 12, the edge 14 surrounding the opening 15, and the bracket part 16 described in the first holder member 10A. has. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect.
In the third holder member 10C, the opening 15 is provided approximately at the center of the third holder member 10C. Further, the opening 15 is provided so that a portion thereof extends close to the end of the third holder member 10C. The recess 12 of the third holder member 10C is provided along at least a portion of the edge 14. Specifically, the recess 12 of the third holder member 10C includes a recess 12 along one side of the edge 14 of the opening 15 and a recess 12 arranged along approximately half of the edge 14 of the opening 15. , consists of.
　続いて、図５を参照して、実施形態に係る第４ホルダ部材１０Ｄを説明する。第４ホルダ部材１０Ｄは、第１ホルダ部材１０Ａにおいて説明したものと同じポリプロピレン材から構成される部材である。第４ホルダ部材１０Ｄは、第１ホルダ部材１０Ａと形状が異なるが、第１ホルダ部材１０Ａで説明した、凹部１２及びブラケット部１６と同じ機能を備える部分を有する。これらの部分については第１ホルダ部材１０Ａでのものと同一の符号を付して、態様の異なる点を除いて詳細な説明を省略する。なお、第４ホルダ部材１０Ｄには縁どられた開口部がない。第４ホルダ部材１０Ｄは、第４ホルダ部材１０Ｄの外縁に沿う１つの短い凹部１２と、第４ホルダ部材１０Ｄの内縁に沿う１つの長い凹部１２とを備える。 Next, the fourth holder member 10D according to the embodiment will be described with reference to FIG. 5. The fourth holder member 10D is a member made of the same polypropylene material as that described for the first holder member 10A. The fourth holder member 10D has a different shape from the first holder member 10A, but has portions that have the same functions as the recess 12 and bracket portion 16 described in the first holder member 10A. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect. Note that the fourth holder member 10D does not have a bordered opening. The fourth holder member 10D includes one short recess 12 along the outer edge of the fourth holder member 10D and one long recess 12 along the inner edge of the fourth holder member 10D.
　続いて、図６を参照して、実施形態に係る第５ホルダ部材１０Ｅを説明する。第５ホルダ部材１０Ｅは、第１ホルダ部材１０Ａにおいて説明したものと同じポリプロピレン材から構成される部材である。第５ホルダ部材１０Ｅは、第１ホルダ部材１０Ａと形状が異なるが、第１ホルダ部材１０Ａで説明した、凹部１２及びブラケット部１６と同じ機能を備える部分を有する。これらの部分については第１ホルダ部材１０Ａでのものと同一の符号を付して、態様の異なる点を除いて詳細な説明を省略する。なお、第５ホルダ部材１０Ｅには縁どられた開口部がない。第５ホルダ部材１０Ｅは、第５ホルダ部材１０Ｅの外縁に沿う１つの凹部１２を備える。 Next, with reference to FIG. 6, the fifth holder member 10E according to the embodiment will be described. The fifth holder member 10E is a member made of the same polypropylene material as that described for the first holder member 10A. Although the fifth holder member 10E has a different shape from the first holder member 10A, it has portions that have the same functions as the recess 12 and the bracket portion 16 described in the first holder member 10A. These portions are designated by the same reference numerals as those in the first holder member 10A, and detailed description thereof will be omitted except for differences in aspect. Note that the fifth holder member 10E does not have a bordered opening. The fifth holder member 10E includes one recess 12 along the outer edge of the fifth holder member 10E.
　以上、本開示の実施形態について説明をしたが、本発明の技術的範囲が本実施形態の説明によって限定的に解釈されるべきではないのは言うまでもない。本実施形態は単なる一例であって、請求の範囲に記載された発明の範囲内において、様々な実施形態の変更が可能であることが当業者によって理解されるところである。本発明の技術的範囲は請求の範囲に記載された発明の範囲及びその均等の範囲に基づいて定められるべきである。 Although the embodiments of the present disclosure have been described above, it goes without saying that the technical scope of the present invention should not be interpreted to be limited by the description of the present embodiments. This embodiment is merely an example, and those skilled in the art will understand that various modifications can be made within the scope of the invention as set forth in the claims. The technical scope of the present invention should be determined based on the scope of the invention described in the claims and the equivalent scope thereof.
　上記実施形態においてプロピレン材を使用する態様を説明したが、例えば分子量をコントロールして成形時の流動性を向上させたポリカーボネート材料を適用してリフレクタ機能を有する複雑な形状のホルダ部材を薄く成形することも考えられる。この場合に上記のプロピレン材で示した構成を適用することも可能である。ただし、プロピレン材自体の軽量性とコスト面の観点から、プロピレン材によりホルダ部材を構成することが好ましい。 In the above embodiment, a mode in which a propylene material is used has been described, but for example, a polycarbonate material whose molecular weight is controlled to improve fluidity during molding may be applied to thinly mold a complex-shaped holder member having a reflector function. It is also possible. In this case, it is also possible to apply the configuration shown in the above propylene material. However, from the viewpoint of the light weight and cost of the propylene material itself, it is preferable to construct the holder member from a propylene material.
　本出願は、２０２２年３月２８日出願の日本特許出願２０２２－０５１４９１に基づくものであり、その内容はここに参照として取り込まれる。 This application is based on Japanese Patent Application No. 2022-051491 filed on March 28, 2022, the contents of which are incorporated herein by reference.

Claims (6)

  1. 　ライトガイドを保持し、前記ライトガイドから放出される光を反射可能に構成された凹部を備え、
    　波長４００～７００ｎｍの光の反射率が７０％以上であるポリプロピレン材から構成される、ホルダ部材。     a recess configured to hold a light guide and reflect light emitted from the light guide;
    A holder member made of polypropylene material with a reflectance of 70% or more for light with a wavelength of 400 to 700 nm.
  2. 　前記ポリプロピレン材が強化材を含み、前記ポリプロピレン材の曲げ弾性率が２ＧＰａ以上５ＧＰａ以下であり、前記ポリプロピレン材の０．４５ＭＰａの曲げ応力に対する荷重たわみ温度が１２０℃以上１４０℃以下である、請求項１に記載のホルダ部材。 The polypropylene material includes a reinforcing material, the bending elastic modulus of the polypropylene material is 2 GPa or more and 5 GPa or less, and the load deflection temperature of the polypropylene material under a bending stress of 0.45 MPa is 120° C. or more and 140° C. or less. 1. The holder member according to 1.
  3. 　前記ポリプロピレン材が紫外線吸収剤、光安定剤またはその両方を含む、請求項１または請求項２に記載のホルダ部材。 The holder member according to claim 1 or 2, wherein the polypropylene material contains an ultraviolet absorber, a light stabilizer, or both.
  4. 　他の部材を挿通可能に構成された開口部を縁取る縁部を備え、前記凹部が前記縁部の少なくとも一部に沿って設けられている、請求項１に記載のホルダ部材。 The holder member according to claim 1, further comprising an edge bordering an opening configured to allow insertion of another member, and wherein the recess is provided along at least a portion of the edge.
  5. 　前記ホルダ部材の外周部分に、車両用灯具に固定可能とされたブラケット部を備える、請求項１に記載のホルダ部材。 The holder member according to claim 1, further comprising a bracket portion that can be fixed to a vehicle lamp on an outer peripheral portion of the holder member.
  6. 　請求項１に記載のホルダ部材を備える、車両用灯具。
          A vehicle lamp comprising the holder member according to claim 1.
PCT/JP2023/010649 2022-03-28 2023-03-17 Holder member and vehicle lamp WO2023189746A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08236814A (en) * 1995-02-22 1996-09-13 Nichia Chem Ind Ltd Method of fixing led lamp for irradiating light guide plate
JP2007145909A (en) * 2005-11-24 2007-06-14 Matsushita Electric Works Ltd Polypropylene resin composition for light-transmitting molded product and light-transmitting molded product
JP2014199474A (en) * 2011-08-08 2014-10-23 シャープ株式会社 Display unit with touch panel
JP2021197335A (en) * 2020-06-18 2021-12-27 日亜化学工業株式会社 Light source module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08236814A (en) * 1995-02-22 1996-09-13 Nichia Chem Ind Ltd Method of fixing led lamp for irradiating light guide plate
JP2007145909A (en) * 2005-11-24 2007-06-14 Matsushita Electric Works Ltd Polypropylene resin composition for light-transmitting molded product and light-transmitting molded product
JP2014199474A (en) * 2011-08-08 2014-10-23 シャープ株式会社 Display unit with touch panel
JP2021197335A (en) * 2020-06-18 2021-12-27 日亜化学工業株式会社 Light source module

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