CN201198290Y

CN201198290Y - LED headlamp for automobile

Info

Publication number: CN201198290Y
Application number: CNU2008200461703U
Authority: CN
Inventors: 樊邦弘
Original assignee: Heshan Lide Electronic Enterprise Co Ltd
Current assignee: Heshan Lide Electronic Enterprise Co Ltd
Priority date: 2008-04-09
Filing date: 2008-04-09
Publication date: 2009-02-25
Anticipated expiration: 2018-04-09

Abstract

The utility model discloses an LED vehicle headlamp which includes an illuminant LED and a light distribution system; the LED is arranged on the vertical direction; the light distribution system includes a link stopper which is arranged in the front and is provided with a boundary with a preset shape; a reflection cup arranged above the LED and a projection lens arranged in front of the link stopper; the reflection cup generates a photospot graph which is cut by the boundary with the preset shape of the link stopper in front of the LED; the size of the photospot graph on the horizontal direction is larger than the size of the vertical direction; the focus of the projection lens is arranged on the photospot graph. Compared with the technical scheme that the link stopper is directly used to shield the partial beams of the LED in the prior art, the photoeffect of the LED vehicle headlamp is higher; compared with the method of adopting the shape of the reflection cup inside the LED to control a bright and dark boundary, the LED vehicle headlamp is easier to control a final light distribution graph.

Description

A kind of LED car headlamp

Technical field

The utility model relates to a kind of light fixture, particularly a kind of LED car headlamp.

Background technology

LED means light-emitting diode from the abbreviation of English LIGHT EMITTING DIODE.The simplest light-emitting diode structure comprises, P-type quartz conductor, N-type quartz conductor and formed between the two PN junction are when electric current passes through diode, at above-mentioned PN junction place, just produce electric charge carrier, i.e. electronics and hole, electronics combines with the hole and gives off energy with the form of photon.The LED lamp compare with white lights such as conventional light source tengsten lamp, fluorescent lamps have life-span length, power saving, durable and react characteristics such as fast, be that the ideal that replaces existing conventional light source is selected; Characteristics such as the particularly incomparable power saving of its conventional light source that has, shockproof and anti-strike are more suitable for applying on the car headlamp.

In the design of car headlamp, certain regulation has all been done to the luminous intensity distribution figure of car headlamp by each country, and purpose is to prevent that car headlamp from disturbing the opposite to sail the eyes of the chaufeur of vehicle to cause traffic accident.General requirement is exactly that the luminous intensity distribution figure that requires to record in the position of car light the place ahead certain distance need exist a specific bright-dark cut.With regard to China, relevant standard produces upwards 15 ° bright-dark cut of a horizon and horizon right side with regard to requiring before car light 25m position far away.

There is several different methods can reach above-mentioned requirements in the optical design of existing LED car headlamp, wherein the simplest method of designing is exactly, be provided with the emergent light direction of LED parallel with the direction of illumination of automobile, be provided with one and have upwards 15 ° of marginal link stoppers of horizontal direction and horizon right side on the vertical surface of LED emergent light direction, this link stopper stops and shines the upwards light more than 15 ° of horizon and horizon right side thereof.Clearly,, wasted the luminous energy of LED the first half, also can in light fixture, produce a large amount of heats simultaneously, increased heat radiation pressure though this method of designing can obtain the luminous intensity distribution figure of requirement.

In addition, Granted publication number be CN1255646C patent disclosure another kind of method of designing, its cup bowl that will hold the LED wafer directly is arranged to the shape of defined luminous intensity distribution figure, a half of optically focused wall that is about to the cup bowl is designed the upwards demarcation line of 15 ° of oblique lines 02 of a horizon 01 and horizon right side, as shown in Figure 1.This method of designing is because cup bowl volume is less, and the cup bowl is again relatively near luminous point, so illumination after being mapped to the demarcation line of optically focused wall diffraction takes place very easily, causes the shade line of final luminous intensity distribution figure not obvious; Moreover factors such as the degree of uniformity of wafer coating fluorescent material and encapsulation process operation all have very big influence to the luminous intensity distribution figure.This shows that adopting this method design-calculated car headlamp is the shape that is difficult to control final luminous intensity distribution figure.

Summary of the invention

The technical problems to be solved in the utility model is: provide a kind of optical system simple, the high luminous intensity distribution figure of light efficiency is the LED car headlamp of accuracy control more.

The utility model solves above-mentioned technical matters by following technical proposals:

A kind of LED car headlamp, comprise luminary LED and light distributing system, described LED is the vertical direction setting, described light distributing system comprise be arranged on LED the place ahead have a marginal link stopper of reservation shape, shroud the reflector above LED and be arranged on the projection lens in link stopper the place ahead; Reflector produces one by the optically focused figure of the demarcation line of described link stopper cutting in LED the place ahead, the horizontal direction size of this optically focused figure is greater than the vertical direction size, and the focus of this projection lens is positioned on the described optically focused figure.

The beneficial effects of the utility model are: because LED is the vertical direction setting, reflector is arranged on the LED top, the light major part that LED sends concentrates on the top of link stopper, after the reflector reflection, can both penetrate substantially, compare with technical scheme of directly blocking the part light of LED with link stopper of the prior art, its light efficiency is higher; Owing to adopt and produce bright-dark cut, compare the luminous intensity distribution figure that easier control is final with the method that the inner reflective cup-shaped of available technology adopting LED is controlled bright-dark cut at LED outer setting link stopper.

The utility model can also further be improved to:

Described optically focused figure is oval.

The marginal shape of described link stopper comprises a horizon and is connected this horizontal downward 15 ° of oblique lines.

Described LED also is connected with radiating fin, and helping practical high-capacity LED like this is to improve radiating efficiency.

Described radiating fin is arranged on the LED below.

The lighting angle of described LED is 90 °

Description of drawings

Fig. 1 is the scheme drawing of prior art car light luminescent system;

Fig. 2 is one of scheme drawing of the utility model structure;

Fig. 3 be the utility model structure scheme drawing two;

Fig. 4 be the utility model structure scheme drawing three;

Fig. 5 is a light path design scheme drawing of the present utility model;

Fig. 6 is the utility model reflector optically focused figure;

Fig. 7 is the final luminous intensity distribution figure of the utility model.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is described further,

With reference to figure 5, a kind of LED car headlamp, comprise luminary LED 1 and light distributing system, described LED1 is the vertical direction setting, described light distributing system comprise be arranged on LED1 the place ahead have a marginal link stopper 2 of reservation shape, shroud the reflector 3 above LED1 and be arranged on the projection lens 5 in link stopper the place ahead; Reflector 3 produces one by the optically focused figure 4 of the demarcation line of described link stopper 2 cutting in LED1 the place ahead, the horizontal direction size of this optically focused figure 4 is greater than the vertical direction size, and the focus of this projection lens 5 is positioned on the described optically focused figure 4.

Referring to figs. 1 through Fig. 5, LED has LAMP and two kinds of packing forms of SMD, and high-power LED generally is the SMD type at present, and for enough brightness is provided, the great power LED that should adopt the SMD type in the utility model is a light source.With reference to Fig. 4 and Fig. 5, be reference with the car light running condition, LED1 vertically is provided with on the substrate 11, i.e. the light emission direction vertical and horizontal line of LED1.Substrate 11 belows can be provided with radiating fin 111 to increase the heat transfer efficiency of substrate 11.Generally has one glass of bowl in the LED1 to place luminescence chip, the cup bowl has the optically focused effect, the shape of cup bowl has determined the rising angle of LED, the rising angle of LED differs in size at present, its lighting angle of LED that the utility model adopts should be less than 180 °, wherein Zui Jia lighting angle is 90, and so almost all light that LED can be sent all reflect away.With reference to Fig. 3, Fig. 4 and Fig. 5, link stopper 2 is connected on the substrate 11 and is positioned at the front end of LED, the demarcation line of link stopper 2 is in order to producing the bright-dark cut on the final luminous intensity distribution figure, so marginal shape should make the dark marginal shape on the final luminous intensity distribution figure meet the requirement of relevant criterion.With regard to Chinese Industrial Standards (CIS), the demarcation line of this link stopper 2 should comprise horizon 21 concordant with substrate and downward 15 ° oblique line 22.Make for convenient, link stopper 2 and substrate 11 can be structure as a whole.LED1 shrouds the top reflector 3 of a covering substrate 11 and link stopper 2, the reflective surface of reflector 3 adopts the free form surface design, can form the microscler optically focused figure 4 that an along continuous straight runs stretches in link stopper 2 the place aheads, this optically focused figure 4 can be oblong or ellipse, optically focused figure 4 is through link stopper 2 marginal formation one and the identical bright-dark cut of link stopper 2 demarcation line shapes of blocking, as shown in Figure 5 and Figure 6.See figures.1.and.2, also be provided with a projecting lens 5 before the link stopper 2, this projecting lens 5 promptly is the convex lens with certain curvature, and its focus is positioned at the position of optically focused figure 4, is used for image upset and the final luminous intensity distribution figure that zooms into according to a certain percentage as shown in Figure 7 with optically focused figure 4.

The utility model is because LED is the vertical direction setting, and reflector is arranged on LED top, LED The light major part of sending concentrates on the top of link stopper, after the reflector reflection, substantially can both penetrate, Compare its light with technical scheme of directly blocking the part light of LED with link stopper of the prior art Imitate higher; Owing to adopt and produce bright-dark cut at LED outer setting link stopper, with prior art The middle method that adopts the inner reflective cup-shaped of LED to control bright-dark cut is compared easier control Final luminous intensity distribution figure.

Claims

1. LED car headlamp, comprise luminary LED and light distributing system, it is characterized in that: described LED is the vertical direction setting, described light distributing system comprise be arranged on LED the place ahead have a marginal link stopper of reservation shape, shroud the reflector above LED and be arranged on the projection lens in link stopper the place ahead; Reflector produces one by the optically focused figure of the demarcation line of described link stopper cutting in LED the place ahead, the horizontal direction size of this optically focused figure is greater than the vertical direction size, and the focus of this projection lens is positioned on the described optically focused figure.

2. according to the described a kind of LED car headlamp of claim 1, it is characterized in that: described optically focused figure is for oval.

3. a kind of LED car headlamp according to claim 1 and 2 is characterized in that: the demarcation line of described link stopper is shaped as and comprises a horizon and be connected this horizontal downward 15 ° of oblique lines.

4. a kind of LED car headlamp according to claim 1, it is characterized in that: described LED also is connected with radiating fin.

5. a kind of LED car headlamp according to claim 3 is characterized in that: described radiating fin is arranged on the LED below.

6. a kind of LED car headlamp according to claim 1 is characterized in that: the lighting angle of described LED is 90 °.