JP2014149980A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that if a resin-made member tending to easily absorb infrared rays is present in a vehicular lighting fixture, the resin-made member absorbs the infrared rays in sunlight when the sunlight enters the inside of vehicular lighting fixture, resulting in melting of the resin-made member.SOLUTION: A vehicular lighting fixture includes a lamp unit provided in a lamp chamber and comprising a light emitting element 11, a projection lens 13, and resin-made members such as an extension 15 and a shade 10. In the vehicular lighting fixture, the resin-made members contain a colored material which transmits infrared rays and cuts visible light, thereby preventing the melting of the resin-made members.

Description

  The present invention relates to a vehicular lamp, and more particularly, to a vehicular lamp capable of avoiding melting of the member due to sunlight collection, which occurs when a lamp member such as an extension or a shade is molded from a resin having insufficient heat resistance. .

  A vehicular lamp, particularly a headlamp, has a light-emitting diode as a light source, a reflector, an extension, a projection lens, a shade, etc., in a lamp chamber that is usually composed of a lamp body and an outer cover that closes the opening of the lamp body. Is arranged.

  In such a vehicular lamp, for example, light emitted from a light emitting diode, a discharge bulb, a halogen bulb, or the like is reflected by the reflector so as to be condensed at the focal point of the projection lens (second focal point of the reflector), and is reflected on the focal point. A shade for forming a cut-off line is arranged, and a light distribution having a predetermined cut-off line is projected (formed) by a projection lens.

  In the vehicle lamp in which the light emitting diode is used as the light source, since the light emitted from the light emitting diode does not contain heat, the resin material which needs less consideration of the influence of heat on the shade located at the focused focal point It is often formed by. Therefore, in a vehicular lamp in which a light emitting diode is used as a light source, a shade and an extension are often integrally formed of a resin material in consideration of a reduction in the number of parts (Patent Document 1 and Patent Document 2). ).

  These shades and extensions are transparent resins such as polyethylene terephthalate-polybutylene terephthalate (PET-PBT), polycarbonate (PC), PC-HT and PBT, that is, resins that can cut and reflect all or part of visible light. In addition, carbon black or the like is added to form a black resin material. However, carbon absorbs infrared rays and raises the material temperature.

JP 2007-157624 A JP 2010-182539 A JP 2010-287396 A

  There is a possibility that sunlight enters the interior of the vehicular lamp configured as described above. For example, if the optical axis of the vehicular lamp coincides with the traveling direction of sunlight while the vehicle is running or stopped, sunlight passes through a path opposite to the path of light emitted from the light emitting diode. There is a possibility that the light enters the interior of the vehicular lamp and is condensed on the front end of the shade that coincides with the focal point of the projection lens.

  Furthermore, apart from the path of the emitted light, depending on the incident angle of sunlight, the resin member such as a shade or an extension may irradiate (condensate) sunlight. When such sunlight condensing or irradiation occurs, as described above, since the shade is formed of a resin material containing carbon, sunlight, particularly infrared rays therein are absorbed, and the infrared rays are absorbed. There is a risk of causing problems such as melting of the shade and peeling of the paint due to heat (Patent Document 3).

  The present invention has been made on the basis of the problems of the prior art described above and the knowledge of the inventor. The purpose of the present invention is to provide a vehicular lamp having a resin member, in particular, the resin member in a headlamp is sunlight. Therefore, it is intended to prevent deterioration such as melting.

  In order to achieve the above object, in the vehicular lamp according to claim 1, at least a light emitting element that is a light source, a projection lens that is a light distribution control member that distributes the light source light forward, and a rear of the projection lens In a vehicular lamp provided with a lamp unit including a resin member disposed in the vicinity of the focal point or around the projection lens, sunlight incident on at least the resin member is incident on the lamp chamber. A portion that may be condensed through the projection lens is configured to contain a coloring substance that transmits infrared rays and cuts visible light.

  For example, even when a vehicle equipped with this vehicle lamp is running or stopped, even if sunlight irradiates a resin member such as an extension or a shade, a predetermined amount of infrared rays, which is a main heat generation source, passes through the resin member. Since the amount of heat generated in the resin member is small, problems such as melting of the resin member and peeling off of the coating of the member can be avoided. Moreover, it is not necessary to make a coloring substance exist in the whole resin member, and it should just exist in the site | part which has a possibility that the sunlight which injected into the room may condense through the projection lens.

  In Claim 2, it adjusts so that the resin-made member of the vehicle lamp of Claim 1 may permeate | transmit 5% or more of infrared rays with a wavelength of 800 nm or more. Since the infrared transmittance of the resin member varies depending on the type and amount of the coloring material, the thickness of the resin member, and the like, it is preferable to adjust the infrared transmittance of the resin member to a suitable transmittance.

  If at least 15% of infrared rays are transmitted without being absorbed, heat generation on the surface and inside of the resin member is efficiently reduced, and the effect of preventing melting and peeling of the member is remarkably exhibited.

  In claim 3, the coloring substance is a dye and / or a pigment.

  Dyes and pigments have relatively high infrared transmission efficiency, and it is effective to use a combination of a plurality of dyes and pigments.

  According to a fourth aspect of the present invention, the resin member is an extension, and a coloring substance is contained in the upper surface of the extension disposed below the projection lens.

  Thereby, even if the upper surface of the extension is irradiated with sunlight, the amount of infrared rays absorbed by the extension becomes small, and melting of the extension can be avoided.

  According to a fifth aspect of the present invention, the resin member is a shade (lens holder), and a coloring substance is contained in the upper surface of the shade disposed behind the projection lens.

  Thereby, even if the upper surface of a shade is irradiated with sunlight, the amount of infrared rays absorbed by the shade becomes small, and melting of the shade can be avoided.

It is a vertical side view of the vehicle headlamp which is one Example of this invention.

  Embodiments of the present invention will be described below based on the illustrated embodiments.

  As shown in the figure, a vehicle headlamp 1 includes a lamp body 2 that opens forward and a transparent outer cover 3 that is attached to the front end of the lamp body 2, and includes a lamp unit 4 inside the lamp body 2. A chamber 5 is formed.

  On the rear inner surface of the lamp body 2, an optical axis adjusting mechanism 8 comprising a pair of upper left and right pivot joints 6 and a lower leveling motor 7 is installed. A plate-shaped metal mounting portion 9 is connected to the optical axis adjusting mechanism 8, and a shade (also a lens holder) 10 whose front upper surface is curved downward is coupled to the mounting portion 9 by integral molding. Yes. The shade 10 is formed by containing 0.001 to 5.0% by weight of a dye or pigment in a resinous base material such as PC that can cut at least part of visible light. The shade 10 is usually formed with an aluminum vapor deposition film (not shown).

  Here, the dye means an organic compound having a relatively small molecular weight and means a dye used in a state of being dissolved or dispersed in water, and the pigment is not dissolved in water or a solvent and remains in a solid particle form. It means a dye used in a dispersed state.

  The base material has high infrared transmittance, and the dye and the pigment have high infrared transmittance as well. Therefore, the transmittance of the shade 10 made of a material having a high infrared transmittance is increased. For example, the shade 10 has an infrared ray having a wavelength of 1000 nm or more of 15%, preferably 50%, more preferably 80%, and a wavelength of 750 nm or more. The material and thickness are set so as to transmit infrared rays by 15%, preferably 50%, more preferably 80%.

  However, a dye such as carbon black has a low infrared transmittance, and when it is contained in the shade 10, the heat absorption rate is increased. Therefore, it is desirable not to use carbon exceeding the trace amount in the shade 10.

  Usable dyes include anthraquinone dyes, azo dyes, pyrazolone dyes, quinophthalone dyes, methine dyes, and coumarin dyes.

  The usable pigments are roughly classified into organic pigments and inorganic pigments. The former includes pyrrole pigments, quinacridone pigments, azo pigments, perylene pigments, dioxane pigments, isoindolinone pigments, and induslenes. Pigments, quinophthalone pigments, perinone pigments, and phthalocyanine pigments. Examples of the latter inorganic pigments include iron oxide, cadmium red, titanium yellow, cadmium yellow, ultramarine, bitumen, cobalt blue, cobalt green, and cerulean blue.

  The resin member is preferably black or a color close thereto. In order to develop black color, a single dye or pigment may be used, or a plurality of types may be combined. As a pigment that develops a black color with a single species, a perylene pigment or an azomethine color pigment is preferable. For example, the former includes Palogen Black S-0084, which is an organic pigment manufactured by BASF, and the latter includes (3- (Amino-arylimino) -1-oxo-4,5,6,7-tetrachloroisoindoline) and diazotized with (2-hydroxy-11H-benzo [a] -carbazole-3-carboxyphenylamide) (2-Hydroxy-N- (2′-methyl-4′-methoxyphenyl) -1-{[4-[(4,5,6,7-tetrachloro-1-oxo-) obtained by diazo coupling 2,3-dihydro-1H-isoindole-3-ylidene) amino] phenyl] azo} -11H-benzo [a] -carbazole-3-cal Boxoxyamide) and the like.

In order to develop a black color with chromatic colors, the yellow (Y), red (M) and indigo (C) with different absorption ranges are used to cut the visible light region and Equivalent black is obtained.
Examples of inorganic yellow pigments include chromic yellow, barium yellow, zinc yellow, cadmium yellow, cobalt yellow, and nickel titanium yellow, and organic yellow pigments having an azo group (RN = NR =). Pigments, for example, azo pigments having an azo group (RN—N—R ′) such as Pigment Yellow 1, Pigment Yellow 3, Pigment Yellow 74, and Pigment Yellow 81, and pyrazolones such as Pigment Orange 13 Pigments, benzimidazolone pigments such as Pigment Yellow 151, and quinoxaline pigments such as Pigment Yellow 213.
Inorganic red pigments include red lead and iron oxide red, and organic red pigments include rose violet (quinacridone magenta), permanent rose, gamma quinacridone, carmine (1- and 2-dihydroxyanthraquinone lake) and permanent Alizalink rimson (quinacridone pyrrolidone).
Examples of inorganic indigo pigments include bitumen, ultramarine blue, and metal oxide blue, and examples of organic indigo pigments include phthalocyanine pigments.

  The dye or pigment may be uniformly dispersed in the resin member, or may be unevenly distributed on the sunlight-irradiated surface of the resin member.

  On the rear upper surface of the shade 10, a light emitting diode 11 made of LED or the like is arranged upward, and above the light emitting diode 11, an elliptical reflector 12 having the light emitting diode 11 arrangement point as a first focal point. Is arranged. The reflector 12 is usually formed with an aluminum vapor deposition film (not shown).

  The shade (lens holder) 10 is formed with an upper front end 14 corresponding to the second focal position of the reflector 12, and a projection lens which is a light distribution control member at the front end of the curved portion of the shade (lens holder) 10. 13 is arranged so that the focal point thereof coincides with the upper surface front end 14 for forming the cut-off line of the shade 10.

  Around the projection lens 13, an annular extension 15 that is a decorative member that closes the gap between the lens 13 and the lamp body 2 is disposed. Similarly to the shade 10 described above, the extension 15 is preferably formed by containing a transparent resinous base material containing an infrared transmitting dye or pigment, and at least one of the shade 10 and the extension 15 is formed. The member is made of resin having the above-described configuration.

  The lamp unit 4 is configured as a projection lamp unit in which the light emitting diode 11, the reflector 12, the shade (also a lens holder) 10, the projection lens 13 and the extension 15 are integrated.

  In the vehicular lamp having the above-described configuration, particularly the vehicular headlamp, the light emitted from the light emitting diode 11 is reflected by the reflector 12 and passes through the projection lens 13 and the outer cover 3 to be irradiated forward. That is, the projection lamp unit 4 forms a light distribution for a passing beam having a predetermined cut line corresponding to the upper front end 14 of the shade 10.

  During the day, the vehicle is irradiated with sunlight, and sunlight enters the lamp chamber 5 of a vehicle lamp such as a vehicle headlamp at an angle according to the season and time. As shown by the solid line arrow A in the figure, when sunlight is incident on the projection lens 13 at a considerably high angle, it is internally reflected on the rear surface of the projection lens 13 and emitted downward from the front surface of the lens 13. Then, the light is condensed on the extension lower region 15 a directly under the projection lens 13. Then, it passes through the aluminum vapor deposition film on the surface of the extension base material and reaches the extension base material.

  When the extension 15 is molded from the above-described high infrared transmissive resin, most of infrared rays in sunlight are transmitted without being absorbed, and part or all of the visible light is cut. The temperature of 15 does not rise excessively.

Further, as shown by a dotted arrow B in the figure, when sunlight enters the lamp chamber 5 through a path opposite to the path of light emitted from the light emitting diode 11, the sunlight passes through the projection lens 13 and is shaded. 10 near the front end 14 of the upper surface. The infrared rays of sunlight pass through the aluminum vapor deposition film on the surface of the shade 10 and reach the base material of the shade 10.
At this time, if the base material of the shade 10 is formed of the above-described high infrared transmissive resin, most of infrared rays in sunlight are transmitted without being absorbed, and part or all of the visible light is cut. Therefore, the temperature of the shade 10 does not rise excessively.

[Example 1]
“S-3000R-W084” manufactured by Mitsubishi Engineer Plastics Co., Ltd. (PC resin added with PALIOGEN BLACK S-0084, an organic pigment manufactured by BASF) was used as a raw material, and a twin screw extruder (screw diameter: 30 mm) Was used to produce extruded pellets at a barrel temperature of 290 ° C. and a rotational speed of 200 rpm. The obtained pellets are dried at 120 ° C. for 4 hours or more before injection molding, and are formed into a commercial vehicle extension shape at a molding temperature of 260 ° C. and a mold temperature of 100 ° C. using an injection molding machine with a clamping force of 75 Ton. Molded into a test piece. The infrared transmittance at 1000 nm of this test piece was measured and found to be 88.9%.

This test piece was fixed to a test stand using a jig, and a simulated sunlight generator was used to irradiate the surface of the test piece with simulated sunlight so that the irradiation amount was 1000 W / m ² . . The ambient temperature was 28.7 ° C.

  Ten minutes later, when the surface temperature of the test piece was measured using a thermograph having an emission coefficient of 1, it was 115 ° C., and no change in appearance could be observed.

[Comparative Example 1]
A commercial vehicle extension (VALOX V2000DM manufactured by Dupont, infrared transmittance of 0.2% at 1000 nm) was irradiated with simulated sunlight under the same conditions as in Example 1. After 10 minutes, the same thermograph was used to measure the surface temperature. It was 168 ° C., and the surface was melted and deformed.
In the above-described embodiment, the entire shade 10 and the extension 15 are each made of a resin that is transparent to high infrared rays, but there is a possibility that the sunlight that has entered the lamp chamber 5 is condensed through the projection lens 13. Only the region in the vicinity of the upper front end 14 of the shade 10 or the lower region 15a of the projection lens 13 in the extension 15 may be formed of a high infrared transmissive resin.
In addition, as a method of forming only a partial region of the shade 10 or the extension 15 with a resin that transmits high infrared rays, for example, a high infrared ray formed in advance in a mold for forming the shade 10 or the extension 15 is used. A method is conceivable in which a predetermined part made of a permeable resin is inserted and molded and integrated.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Lamp body 3 Outer cover 4 Lamp unit 5 Lamp chamber 6 Pivot coupling 7 Leveling mechanism 8 Optical axis adjustment mechanism 9 Mounting part 10 Shade (also lens holder)
DESCRIPTION OF SYMBOLS 11 Light emitting diode 12 Reflector 13 Projection lens 14 Shade upper surface front end 15 Extension

Claims (5)

A light emitting element that is at least a light source; a projection lens that is a light distribution control member that distributes the light source light forward; and a resin member that is disposed near or around the rear focal point of the projection lens. In a vehicle lamp provided with a lamp unit provided in a lamp chamber,
A colored substance that transmits infrared rays and cuts visible light is contained in at least a portion of the resin member where sunlight incident into the lamp chamber may be condensed through the projection lens. A vehicular lamp.   The vehicular lamp according to claim 1, wherein the resin member transmits 5% or more of infrared rays having a wavelength of 800 nm or more.   The vehicular lamp according to claim 1, wherein the coloring substance is a dye and / or a pigment.   The vehicular lamp according to any one of claims 1 to 3, wherein the coloring substance is contained on an upper surface of an extension extending below the projection lens.   The vehicular lamp according to any one of claims 1 to 3, wherein the coloring substance is contained in an upper surface of a shade disposed behind the projection lens.

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