Double-free-form-surface optical lens for LED (Light-emitting Diode) automobile dipped headlight

Abstract

The invention discloses a double-free-form-surface optical lens for an LED (Light-emitting Diode) automobile dipped headlight. The double-free-form-surface optical lens is formed by combining two free-form surfaces, wherein the first free-form surface is an incident plane, and the second free-form surface is an exit surface; a chip is placed at a focal point part of an ellipsoidal reflector cup; a baffle plate is placed at the other focal point part; the lens is placed in front of the baffle plate; a light emitted by the chip is ejected from the other focal point through a condensing function of the reflector cup; and due to the function of the baffle plate, a stray light is blocked, and a condensed light is irradiated on a lighting surface through the correction of the lens so as to form a required lighting light spot. According to the double-free-form-surface optical lens for the LED automobile dipped headlight provided by the invention, the direction and the distribution of the light are controlled through the two free-form surfaces of the lens, so that a lighting area meets the requirements on light distribution and illuminance of the automobile dipped headlight according to the national standard. The double-free-form-surface optical lens for the LED automobile dipped headlight provided by the invention solves the problems of severe chromatic dispersion, high color temperature, low light effect utilization ratio and the like existed in an existing automobile lens lighting technology; and the lighting area meets the requirements on light distribution and illuminance of the automobile dipped headlight according to the national standard.

Description

technical field [0001] The invention belongs to the technical field of LED lighting, and in particular relates to a double free-form surface optical lens used for low-beam lamps of LED automobiles. Background technique [0002] LED light source has the incomparable advantages of traditional light sources such as long life, small size, energy saving and environmental protection, short response time, and large design freedom, so it has become the fourth-generation light source of automobile headlights. [0003] In the design of automobile headlights, the national standard GB25991-2010 stipulates the light distribution pattern of automobile headlights, the purpose is to prevent automobile headlights from interfering with oncoming vehicles and causing traffic accidents. For the dipped beam, it is required to produce a horizontal line and a cut-off line 15° upward on the right side of the horizontal line on the lighting surface 25m away from the headlight. The low-beam lighting ...

AI Technical Summary

Problems solved by technology

However, the existing automotive high beam lens has the problems of high color temperature and low optical efficiency, resulting in unclear cut-off line and serious dispersion near the cut-off line, which brings great troubles to the comfort and safety of driving. LED is better used in the field of automotive lighting, this problem needs to be solved urgently

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