JP2009295594A - Led lamp for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of freezing of an LED lamp having proper properties as a vehicle. <P>SOLUTION: A carbonaceous heating element 16 is arranged in a lamp housing 12 housing LEDs 14, and a reflection plate 18 is arranged so that the heat rays emitted from the carbonaceous heating element 16 are irradiated on a front panel 10. The front panel 10 frozen is thawed, by utilizing the carbonaceous heating element having properties of small rush current, quick rise in the temperature, and high far-infrared-ray emission efficiency. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle lamp using an LED (light emitting diode) as a light source.

  In the flow of response to environmental issues, safety, and emphasis on design by automakers, LEDs have a lifetime that is five times that of incandescent bulbs and consumes 1/8 that of incandescent bulbs. Since the thickness can be reduced, the design can be improved. In addition, there is a merit in terms of safety because visibility is improved compared to incandescent bulbs. Therefore, it is considered that the exterior lamps for automobiles have been changed from incandescent light bulbs to halogen bulbs and gas charged bulbs, and in the future, LEDs with the above-mentioned advantages will be promoted. With the use of LEDs for automobile lamps (rear combinations and head combinations), freezing of outer panels of LED rear combination lamps and LED headlights has become an issue. The cause of this problem is that the infrared component is not emitted from the LED, and when the white LED is compared with a normal light bulb, a halogen bulb, or a gas charged bulb, the temperature of the front panel of the LED hardly rises. Therefore, there is a problem that surface freezing occurs at the time of cold and visibility is deteriorated. This problem is considered to occur not only in the rear combination lamp but also in LED headlights that will be replaced in the future. Lamps constituting a rear combination lamp such as a blinker stop lamp are important safety and security parts, and it is a safety problem that visibility is deteriorated when frozen. Also, it is a safety problem to drive the headlight while it is frozen.

  Therefore, a technique for warming the outer panel is required.

JP-A-10-289602 Japanese Patent Publication No. 5-54201 JP 2002-150812 A JP 2002-93210 A

  Accordingly, an object of the present invention is to provide a vehicle LED lamp that can be rapidly and surely melted even when the surface is frozen, or even when the surface is frozen.

  According to the present invention, there is provided a vehicle LED lamp including a lamp housing, an LED provided in the lamp housing, and a carbon-based heating element provided in the lamp housing.

  The vehicle LED lamp preferably further includes a reflector that collects heat rays from the carbon-based heating element on the front panel of the lamp.

  The carbon-based heating element has the characteristics that the inrush current is small, the temperature rises quickly, and the far-infrared radiation efficiency is high. By providing a carbon-based heating element with such characteristics in the lamp housing of the LED lamp, the entire lamp housing is quickly warmed by the irradiation of heat rays (particularly far infrared rays) generated from the carbon-based heating element and convection heat. The surface freeze can be thawed quickly.

  Furthermore, the freezing of the front panel can be efficiently thawed by providing a reflector that collects the heat rays from the carbon-based heating element on the front panel of the lamp.

It is a top view of the LED rear combination lamp according to an embodiment of the present invention, It is XX sectional drawing of FIG. It is YY sectional drawing of FIG. It is a figure which shows a heat generating body lamp. It is a figure of the LED rear combination lamp using the heat generating body lamp | ramp of FIG.

  FIG. 1 is a plan view of an LED rear combination lamp according to an embodiment of a vehicle LED lamp of the present invention, FIG. 2 is an XX sectional view thereof, and FIG. 3 is a YY sectional view thereof. FIG. 1 shows a state in which the front panel 10 in front of the lamp is removed.

  A plurality of LEDs 14 are provided inside the housing 12 of the LED rear combination lamp shown in FIGS. 1 to 3, and a rod-like carbon-based heating element 16 having a rectangular cross section is provided inside the housing 12 and near the front panel 10. It has been. Behind the carbon-based heating element 16 is provided a reflector 18 for selectively irradiating the front panel 10 with heat rays from the carbon-based heating element 16.

  The wavelength of the heat ray emitted from the carbon-based heating element 16 is in the infrared to far-infrared region depending on the temperature at which heat is generated, and the peak wavelength of the absorption intensity in the infrared absorption spectrum of water is about 2.7 μm, Since the methyl methacrylate resin used for the panel 10 includes a peak wavelength of about 5.9 μm or around 7.9 μm, it can be effectively heated.

  The carbon-based heating element 16 is obtained by forming a composition having shapeability and exhibiting a carbon residue yield that is substantially zero after firing into a desired shape and then firing.

  If crystalline carbon powder such as carbon black, graphite or coke powder is mixed with the composition before molding, the formability is improved. In addition, heat generation after firing a metal or metalloid compound such as metal carbide, metal boride, metal silicide, metal nitride, metal oxide, metalloid nitride, metalloid oxide or metalloid carbide By mixing at a ratio corresponding to the specific resistance value of the body, a heating element having an arbitrary specific resistance value can be obtained. Therefore, the restriction of the cross-sectional area and length required for the heating element that realizes the resistance value determined from the voltage value of the power supply used and the required heat generation is greatly increased by the control of the specific resistance value. Since it is relieved, it becomes possible to manufacture a heating element having any shape suitable for the application of the heating element.

  Examples of the composition having a formability and a non-zero carbon residue after firing include thermoplastics such as polyvinyl chloride, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride-polyvinyl acetate copolymer, and polyamide. Natural thermo-resin such as resin, phenol resin, furan resin, epoxy resin, unsaturated polyester resin, polyimide, etc., condensed polycyclic aromatics such as lignin, cellulose, gum tragacanth, gum arabic, sugar Examples of the polymer material include synthetic polymer materials having a condensed polycyclic aromatic compound in the basic structure of the molecule, such as a formalin condensate of naphthalenesulfonic acid and a copna resin, which are not contained in the above. The species and amount of the composition to be used are appropriately selected depending on the shape of the target heating element, and can be used alone or as a mixture of two or more, but in particular, a polyvinyl chloride resin or a furan resin should be used. Is preferred.

  The shape of the heating element may be any shape such as a coil shape, a rod shape, a plate shape, or a ring shape.

  In order to prevent oxidation of the carbon-based heating element, the heating element may be sealed in an inert atmosphere. However, for example, when the heating element is used at a temperature not to be oxidized of 500 ° C. or less, it can be used without sealing. However, even in that case, the sealed tube is more effective for electrical insulation and protection.

  In addition, if it is used under conditions that do not emit light when energized, for example, the temperature of the heating element is 500 ° C. or less, the function as the illumination is not hindered at all, and there is no light emission other than the illumination. The front panel 10 can be heated and the freezing of the front panel 10 can be thawed while having the advantage that the appearance is not impaired at all.

  Although not shown, a sensor may be provided on the front panel, and when the temperature reaches a certain level, the carbon heating element 16 may be energized to heat the front panel 10.

  A heating element lamp 20 using a coiled carbon heating element as shown in FIG. 4 may be provided between a number of LEDs 14 as shown in FIG. 5 instead of the rod-like carbon heating element 16 having a rectangular cross section. . In the heating element lamp 20 of FIG. 4, the coiled carbon heating element 22 is coupled at both ends by forming a double helix with the coil of the lead wire 24.

  Although an example of a rear combination lamp that has been converted to an LED has been described, the present invention is also applicable to a front light that has been converted to an LED. In this case, a structure in which far-infrared rays are irradiated in a spot manner on a portion of the front panel of the lamp through which the condensed light is transmitted may be used.

Claims (2)

A lamp housing (12);
An LED (14) provided in the lamp housing;
A carbon-based heating element (16) provided in the lamp housing,
The carbon-based heating element is obtained by mixing crystalline carbon powder and a metal or metalloid compound with a composition having a formability and showing a substantially non-zero carbon residue yield after firing, and firing.
The carbon-based heating element has a rod shape and extends to a length close to the length of the lamp housing.   The vehicle LED lamp according to claim 1, further comprising a reflector (18) for collecting heat rays from the carbon-based heating element on a panel in front of the lamp.

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