Patent Application
20170343177
The subject matter herein generally relates to a light source, a headlamp having a light source, and a vehicle having the headlamp.
Vehicles can employ headlamps which comprise light sources for emitting blue light beam, onto yellow fluorescent layers. The yellow fluorescent layer comprises fluorescent powders which are triggered by the blue light beam to form yellow light beam. The blue light beam is then mixed with the yellow light beam to form white light beam for illumination purposes.
However, the fluorescing powders may not been distributed in the yellow fluorescent layer uniformly. Thus, different parts of the yellow fluorescent layer are not evenly triggered by the blue light beam, thus causing the laser beam travelling out of the headlamp to become slightly blue or slightly yellow.
Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the exemplary embodiments described herein. However, it will be understood by those of ordinary skill in the art that the exemplary embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the exemplary embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.
The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like.
The light source 10 emits light. In at least one exemplary embodiment, the light source 10 is a laser source or a light emitting diode (LED).
The lens group 20 increases an incident angle of the light from the light source 10 while maintaining an incident angle of the light. In at least one exemplary embodiment, the lens group 20 comprises a divergent lens 21 and a convergent lens 22. The divergent lens 21 is positioned between the light source 10 and the convergent lens 22. The divergent lens 21 diverges the light from the light source 10. The convergent lens 22 converges the divergent light from the diverging lens 21. An incident diameter of the light from the convergent lens 22 is greater than the incident diameter of the light from the light source 10. A convergent angle of the light from the convergent lens 22 substantially equals the incident angle of the light from the light source 10.
In other exemplary embodiments, the lens group 20 comprises a number of divergent lenses 21 and a number of convergent lenses 22 successively positioned along the axis 110. Thus, the lens group 20 can repeatedly diverge and converge the light to increase the incident angle of the light from the light source 10 while maintaining the incident angle of the light.
The light adjusting device 30 changes an outgoing direction of at least one portion of the light from the lens group 20, thereby adjusting an intensity of the light passing through the portion of the light adjusting device 30.
In at least one exemplary embodiment, the light adjusting device 30 is made of liquid crystal material. When a voltage is applied to the light adjusting device 30, orientations of crystal lattices of the portion of the light adjusting device 30 are rearranged to change a refraction index of the light adjusting device 30, thereby changing the outgoing directions of the light passing through the light adjusting device 30.
In another exemplary embodiment, the light adjusting device 30 is not made of liquid crystal material.
In other exemplary embodiments, the light adjusting device 30 is made of liquid crystal material, and also comprises the polarizing splitter 31 and the second polarizing splitter 32. In this case, the part of the parallel light from the lens group 20 is reflected by the first polarizing splitter 31 towards the lens group 20. The remaining parallel light is totally reflected by the crystal lattices towards the lens group 20, or towards the lens converting device 40, or can pass directly through the crystal lattices. A part of the remaining parallel light is then reflected by the second polarizing splitter 32 towards the lens group 20. Thus, the intensity of the intensity of the light passing through the portion of the light adjusting device 30 is adjusted.
The fluorescent layer 40 comprises fluorescent powders which can be triggered by the light from the light adjusting device 30 to fluoresce and emit a complementary light which has light color complementary to the light from the light adjusting device 30. The complementary light beam is mixed with the light to form white light.
In at least one exemplary embodiment, the light source 10 emits blue light. The fluorescent layer 40 comprises yellow fluorescent powders which can be triggered by the blue light to emit yellow light. The yellow light is mixed with the blue light to form the white light.
The lens unit 50 diverges or converges the white light from the fluorescent layer 40. In at least one exemplary embodiment, the lens unit 50 is a divergent or convergent lens.
With the above configuration, even if the fluorescent powders comprised in the fluorescent layer 40 are not distributed uniformly, the intensity of light passing through different portions of the light adjusting device 30 can be adjusted according to amounts of the fluorescent powders distributed in different parts of the fluorescent layer 40, thus compensating for different parts of the fluorescent layer 40 and enabling the light travelling out of the headlamp to be white.
It is to be understood, even though information and advantages of the present exemplary embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present exemplary embodiments, the disclosure is illustrative only; changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present exemplary embodiments, to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 105116714 | May 2016 | TW | national |
