CN103574467A

CN103574467A - LED (Light Emitting Diode) upper-beam headlight for motor vehicle

Info

Publication number: CN103574467A
Application number: CN201310359401.1A
Authority: CN
Inventors: 毛振权
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-19
Filing date: 2013-08-19
Publication date: 2014-02-12

Abstract

The invention relates to an optical unit for an LED (Light Emitting Diode) upper-beam headlight for a motor vehicle. One or more optical units with a small-angle optical beam output function are comprised. The optical unit comprises an LED light source and a coating parabolic reflective mirror arranged near a focus, and a ball beam refraction rod arranged at the central axis. The common reflective mirror completes the main reflecting of light in a range of an angle alpha 3 at the center, and beams from a part which can not be reflected by the reflective mirror are refracted by the ball beam refraction rod at the central axis so that the beams are parallel to a principal optic axis and are emitted at a small angle.

Description

LED motor vehicle high beam headlamp

Application number is: 201210243910.3 LED motor vehicle high beam headlamp (hereinafter to be referred as option A), the optical unit that it contains one or more these patent indications, in order at α ₁～α ₃full-shape within the scope of realize the low-angle light beam output be parallel to primary optical axis, to reach the basic demand of the far lighting of motor vehicle standard code; The application's patent: LED motor vehicle high beam headlamp (two), hereinafter to be referred as option b, it also contains the optical unit identical with option A, is the basic demand that will realize the far lighting that meets motor vehicle standard equally.Introduce this optical unit below.

Fig. 1 is the structure chart of the optical unit of LED motor vehicle high beam headlamp (two)

Fig. 2 realizes the analysis chart that low-angle light beam penetrates

Fig. 3 is bulb light refraction rod refraction principle figure

Fig. 4 is two scheme comparison diagrams of identical appearance size

Fig. 5 is I place enlarged drawing in Fig. 4

Each optical unit is by coating parabolic mirror 2 and be arranged on the bulb light refraction rod 3 of central shaft position, and near the LED light source 1 being arranged on parabolic focus forms (seeing Fig. 1).Speculum 2 completes α ₁～α ₂the common mirror-reflection of scope, realizes " low-angle " γ that is parallel to primary optical axis _blight beam output.Axis position α ₃the light beam that part can not complete reflection by speculum is completed the refraction of light by the bulb light refraction rod 3 that is arranged on central shaft position, also form γ _b' low-angle light beam is assembled (seeing Fig. 2); Thereby the same basic demand that can meet motor vehicle high beam headlamp the same as option A.

Option b and option A are substantially identical: option b has just substituted " total reflection " of the printing opacity entity of option A with common minute surface coating reflection; Central shaft position α ₃part, reflection less than part be all to have assembled with refraction at spherical surface, to be parallel to the low-angle light beam ejaculation of primary optical axis, see Fig. 3.

Spherical radius can meet formula: sin α _empty=1.5sin α _thoroughlyprerequisite under, by mapping, complete.Due to α ₃angle is larger, and radius R can be made the different circular arc of tangent radius between two of segmentation, makes the composite sphere that R does not wait.

The sphere interface of option b and option A is all arranged on the position that medium changes, and bulb is all to point to air dielectric one side (be that option b is to point to light source one side, option A is in the exit direction of light).More than illustrate that two schemes are in fact very identical.

It should be noted that the light image angle γ (light image on corresponding screen) of optical unit output, the position (interface) that changes (from printing opacity entity to air) at the medium of optical unit has the refraction varying in size and amplifies phenomenon: option A is that option b is to contain on the little spherical surface of chip at LED light source 1 in the going out on optical plane of unit; If the optical unit appearance and size of two schemes identical (same parabola), chip size size is identical, the two coincidence is drawn in together, A, B point represents respectively the point (seeing Fig. 4 and Fig. 5) in option A and option b, if there is the A point of the light directive option A of 1 M at the edge of chip, hand over chip female surface in N point, at A point " total reflection " formation " light image angle γ _a, at the exiting surface A of entity ₁point, the saturating body changing air of medium produces refraction and forms γ _a' penetrate γ _a' ≈ 1.5 γ _a.(light is during from M point directive A point, and because LED light source can be treated as the saturating body of direct embedding, option A has installation measure to guarantee, therefore can think that the light that M directive A is ordered does not change direction at N point)

Option b, same point M in chip outer rim, intersects at N point at light directive A point and " chip female surface ", and this interface inner side is the transparent body that contains chip, and outside is air, so have respectively α in the interior outside of this interface _thoroughlyand α _emptycorresponding refraction angle, makes light from the B point of N point skew directive option b, forms γ _b, output or γ after mirror-reflection _b.

By mapping, found out this γ _bcompare γ _a' obviously much bigger, be the equidirectional light of same point, option b is more much larger than half light image angle of option A, the two corresponding light image Area Ratio can reach 2～3 times more than, and comprehensively other situations, realize same photometric standards, option b depletes energy (LM) 1～2 times than option A more, if option A has 300LM much of that, option b will 600LM～900LM, and this is the defect that option b is very large.

Claims

1. the optical unit for LED motor vehicle high beam headlamp (two), it is comprised of a coating parabolic mirror and the bulb light refraction rod that is arranged on the LED light source at parabolic focus place and is arranged on axis position, to realize whole reflections and the refraction of the light of reflection angle part and central shaft part, make its comprehensive realization be parallel to the low-angle light beam output of primary optical axis.

2. by the refraction of central shaft claimed in claim 1 position, be to be completed by bulb light refraction rod, the tangent circular arc line segment between two that bulb tangent plane line is not waited by some radiuses forms, and the bulb of its composite sphere points to light source one side.