KR101680624B1

KR101680624B1 - headlight of motor vehicle

Info

Publication number: KR101680624B1
Application number: KR1020140175308A
Authority: KR
Inventors: 박종복; 한수욱; 임정운; 김윤현
Original assignee: 한국광기술원
Priority date: 2014-12-08
Filing date: 2014-12-08
Publication date: 2016-11-30
Also published as: KR20160069621A

Abstract

The present invention relates to a headlamp for an automobile mounted on an automobile, and more particularly, to a headlamp for an automobile mounted on an automobile, which comprises a pulse laser light source for emitting pulse laser light which is mounted in a housing and turned on / off at a predetermined cycle, And a heat dissipating unit coupled to the white light generating unit of the white light generating unit in a region deviated from the path of the pulse laser light to dissipate heat generated in the fluorescent material. According to the headlight of such an automobile, a laser driven in a pulse phase is utilized by utilizing a visual afterimage effect, and the durability can be improved by effectively releasing heat from the phosphor

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a headlamp for an automobile, and more particularly, to a headlamp of a vehicle capable of mitigating thermal damage of the phosphor.

A headlight of a car is a lighting device used for ensuring the front view of a driver in a nighttime, rainy weather, fog, and the like.

In general, a general bulb applied to a headlight of a vehicle has a short life span and a low power efficiency. Recently, a headlight structure using a light emitting diode has been variously disclosed in Korean Patent No. 10-0754886.

On the other hand, in the case of using a laser as a light source and applying a phosphor for converting the light emitted from the laser to white light, the phosphor may be easily damaged by the heat generated by the laser light, do.

It is an object of the present invention to provide a headlamp for an automobile which is capable of suppressing thermal damage of a phosphor due to a laser light.

According to an aspect of the present invention, there is provided a headlamp for a vehicle, the headlamp including: a pulsed laser light source for emitting pulsed laser light that is turned on / off at a predetermined cycle; A white light generator having a phosphor formed on a traveling path of light emitted from the pulsed laser light source and generating white light from the incident pulsed laser light; And a heat radiating part coupled to the white light generating part of the white light generating part in an area outside the path of the pulse laser light to radiate heat generated in the phosphor.

It is preferable that the pulse laser light source emits ultraviolet light, and the pulse frequency of the pulse laser light emitted from the pulse laser light source is preferably 1 KHz to 100 KHz.

A first plate-shaped mirror for reflecting the light emitted from the pulse laser light source and converting the path of light to be incident on the white light generating unit; And a concave reflector having a curvature in which the light incident surface is concave so that the path of the white light proceeding through the white light generating unit is converted while being converged.

According to an aspect of the present invention, the white light generating unit includes: a transparent body made of transparent sapphire; A reflection suppressing layer formed of at least one material selected from the group consisting of MgF ₂ , Al ₂ O ₃ , SiO ₂ and TiO ₂ so as to suppress the reflection of the incident light on the surface of the transparent body on which the light traveling through the first plate- ; And a phosphor layer formed on the bottom surface of the transparent body opposite to the concave reflector, wherein the heat dissipation unit is coupled with a metal material in an area outside the light incidence path of the transparent body, And a heat sink for emitting heat conducted through the heat sink.

According to another aspect of the present invention, there is provided a white light emitting device, comprising: a phosphor lens having a phosphor, the phosphor being solidified by being impregnated with a resin, the emitting surface of the phosphor facing the light incident surface being convex; And a reflection layer coated on the outer surface of the phosphor lens outside the emission surface with a metal material having a high reflectance, wherein the radiation portion is coupled with a metal material through a reflection layer, and is generated in the phosphor lens, And a heat dissipating plate for dissipating heat.

Preferably, the phosphor lens is formed by mixing 90 to 98 weight percent of a resin with 2 to 10 weight percent of a phosphor, and the resin is applied with an epoxy or a silicone resin.

According to the headlight of the automobile of the present invention, a laser driven in a pulse phase is utilized by utilizing a visual afterimage effect, and the durability can be improved by effectively releasing heat from the phosphor.

1 is a view illustrating a headlight structure of a vehicle according to an embodiment of the present invention,
2 is a view showing a headlight structure of a vehicle according to another embodiment of the present invention.

Hereinafter, a vehicle headlamp according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a headlight structure of a vehicle according to an embodiment of the present invention.

1, a vehicle headlamp 100 according to the present invention includes a pulse laser light source 110, a first plate mirror 121, a concave reflector 123, a white light generating unit 130, a heat dissipating unit 150, Respectively.

The pulse laser light source 110 is mounted in the housing 101 and emits pulsed laser light that is turned on / off at a predetermined cycle.

Here, the housing 101 may be appropriately formed to correspond to the structure of an automobile to which the present invention is applied, and may be formed so that optical elements to be described later including the pulsed laser light source 110 can be mounted and supported.

The pulsed laser light source 110 is adapted to emit ultraviolet (UV) laser light.

The pulse frequency f at which pulses of the pulsed laser light are repeated in the pulse laser light source 110 can obtain a continuous irradiation effect visually by the afterimage effect of the human body while allowing efficient heat radiation of the phosphor during the light- In the range of 1 KHz to 100 KHz.

The first plate mirror 121 reflects the light emitted from the pulse laser light source 110 and converts the path of the light to be incident on the concave reflector 123 via the white light generating unit 130 to be described later.

It is needless to say that the first plate type mirror 121 may be omitted when the light emitted from the pulsed laser light source 110 is directly incident on the white light generating unit 130. [

The white light generating unit 130 is disposed on the traveling path of the light emitted from the pulsed laser light source 110 and reflected by the first plate-shaped mirror 121 to form a phosphor that generates white light from the incident pulsed laser light have.

The white light generating unit 130 includes a transparent body 131, a reflection suppressing layer 133, and a phosphor layer 135.

The transparent body 131 is formed of a material having a high light transmittance and a low ultraviolet absorption coefficient and a high thermal conductivity.

For example, the transparent body 131 is formed in a square shape using a sapphire material.

The reflection suppressing layer 133 is formed of MgF ₂ , Al ₂ O ₃ , SiO ₂ , SiO ₂ , or the like so as to suppress reflection of incident light, that is, ultraviolet light, on the upper surface of the transparent body 131, TiO is formed by at least one of the _two materials.

The phosphor layer 135 is formed so that the phosphor is contained on the bottom surface of the transparent body 131 facing the concave reflector 123.

The fluorescent material applied to the phosphor layer 135 may be a solidified material containing a known fluorescent material which is excited by ultraviolet rays and emits white light.

The heat dissipation unit 150 is coupled to the white light generation unit 130 in an area outside the path of the pulsed laser light of the white light generation unit 130 to dissipate heat generated in the fluorescent layer 135.

The heat dissipation unit 150 is formed of a metal material having a high heat dissipation capability, for example, an aluminum material, and is bonded to the upper surface and the side surface of the transparent body 131, A thermal grease 151 for increasing heat conduction efficiency between the heat radiating plate 151 and the transparent body 131, a heat radiating plate 151 for radiating the heat generated in the heat radiating body 135 through the transparent body 131 by air cooling, (Not shown) is inserted.

Thermal grease is a mixture of silver nanoparticles and silver nanowires to reduce thermal resistance.

Reference numeral 137 denotes a collimating lens that focuses the light emitted from the phosphor layer 135 to the concave reflecting mirror 123.

The concave reflector 123 has a structure in which the light incident surface 123a has a concave curvature so that the concave reflector 123 can converge and emit white light while passing through the fluorescent layer 135 of the white light generating unit 130.

According to the structure of the headlamp 100, the heat radiation efficiency of the phosphor layer 135 can be increased and the thermal damage of the phosphor can be suppressed.

A structure of a white light generator according to another embodiment of the present invention will be described with reference to FIG. The same reference numerals denote the same elements as those in the drawings.

Referring to FIG. 2, the white light generator 130 includes a phosphor lens 136 and a reflective layer 138.

The phosphor lens 136 is formed in a convex lens shape in which the phosphor is solidified by impregnating the fluorescent material and the upper incidence surface on which light is incident is flat and the emergence surface of the phosphor sheet 136 facing the incidence surface is convex have.

The phosphor lens 136 is formed by curing a mixture of 2 to 10% by weight of the phosphor and 90 to 98% by weight of a resin having a high thermal conductivity, for example, epoxy or silicone resin.

The reflection layer 138 has a function of reflecting the light traveling to the side of the light emitted by the phosphor lens 153 toward the convex portion 136a and a function of reflecting the light toward the convex portion 136a of the front side of the phosphor lens 136 It is coated with a metallic material on the outside surface which is out of the incidence surface and exit surface.

The reflective layer 138 may be formed of a material such as silver, gold, or nickel.

The heat sink 151 is bonded via the reflective layer 138, and the thermal grease previously described can be inserted between the heat sink 151 and the reflective layer 138.

According to the headlamp 100 of the automobile described above, a laser driven in a pulse phase is utilized by utilizing a visual afterimage effect, and the durability can be improved by effectively releasing heat from the phosphor.

110: Pulsed laser light source 121: First plate mirror
123: concave reflector 130: white light generating unit
131: transparent body 133: anti-reflection layer
135: Phosphor layer 136: Phosphor lens
138: Reflective layer
151: heat sink

Claims

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In a headlight of an automobile mounted on a vehicle,
A pulse laser light source which is mounted in the housing and emits pulsed laser light which is turned on / off at a predetermined cycle;
A white light generator having a phosphor formed on a traveling path of light emitted from the pulsed laser light source and generating white light from the incident pulsed laser light;
A heat dissipation unit coupled to the white light generation unit in an area outside the path of the pulse laser light of the white light generation unit to dissipate heat generated in the phosphor;
A first plate-shaped mirror for reflecting the light emitted from the pulsed laser light source and converting the path of light to be incident on the white light generator;
And a concave reflector having a curvature in which a light incident surface is concaved so as to be converged while converting a path of white light traveling through the white light generator,
Wherein the pulsed laser light source emits ultraviolet light, the pulse frequency of the pulsed laser light emitted from the pulsed laser light source is 1 KHz to 100 KHz,
The white light generating unit
A transparent body made of transparent sapphire;
A reflection suppressing layer formed of at least one material selected from the group consisting of MgF ₂ , Al ₂ O ₃ , SiO ₂ and TiO ₂ so as to suppress the reflection of the incident light on the surface of the transparent body on which the light traveling through the first plate- ;
And a phosphor layer formed on the bottom surface of the transparent body opposite to the concave reflector, the phosphor layer being formed of a phosphor,
The heat-
And a heat dissipation plate coupled to the metal body in an area outside the light incidence path of the transparent body to emit heat generated in the phosphor layer and conducted through the transparent body.

In a headlight of an automobile mounted on a vehicle,
A pulse laser light source which is mounted in the housing and emits pulsed laser light which is turned on / off at a predetermined cycle;
A white light generator having a phosphor formed on a traveling path of light emitted from the pulsed laser light source and generating white light from the incident pulsed laser light;
A heat dissipation unit coupled to the white light generation unit in an area outside the path of the pulse laser light of the white light generation unit to dissipate heat generated in the phosphor;
A first plate-shaped mirror for reflecting the light emitted from the pulsed laser light source and converting the path of light to be incident on the white light generator;
And a concave reflector having a curvature in which a light incident surface is concaved so as to be converged while converting a path of white light traveling through the white light generator,
Wherein the pulsed laser light source emits ultraviolet light, the pulse frequency of the pulsed laser light emitted from the pulsed laser light source is 1 KHz to 100 KHz,
The white light generating unit
A phosphor lens having a convexly projecting surface on which the phosphor is impregnated with the resin to solidify the surface of the phosphor and to which light is incident;
And a reflective layer coated on the outer side surface of the phosphor lens,
Wherein the heat dissipation unit includes a heat dissipation plate coupled to the heat dissipation unit through a reflective layer and made of a metal material and configured to radiate heat generated in the phosphor lens and conducted through the reflective layer.

6. The headlamp of a motor vehicle according to claim 5, wherein the phosphor lens is formed by mixing 90 to 98 weight percent of a resin with 2 to 10 weight percent of a phosphor, and the resin is applied with epoxy or silicone resin.