CN115681882A

CN115681882A - Optical system for improving light energy utilization rate of atmosphere light

Info

Publication number: CN115681882A
Application number: CN202211425364.5A
Authority: CN
Inventors: 杨卫光; 刘烜; 谢彤
Original assignee: SAIC Volkswagen Automotive Co Ltd
Current assignee: SAIC Volkswagen Automotive Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-02-03

Abstract

The invention provides an optical system for improving the energy utilization rate of atmosphere light, which comprises: a light guide and a light source module disposed at a first end of the light guide; the reflecting system is arranged at the second end of the light guide and comprises a convex lens module and a light condensing module which are fixedly arranged by a sealing sleeve; the convex lens module and the light condensing module have a common focus, and the light condensing module collects reflected light, converges the reflected light at the focus of the convex lens module, and then enters the convex lens module again to form parallel light to be injected into the light guide. The optical system can meet the requirement of the light-emitting uniformity of the long light-guide atmosphere lamp under the condition of not increasing a light source module or a light guide, has lower cost, ensures the consistency of colors, improves the light utilization rate of the atmosphere lamp, and has certain flexibility.

Description

Optical system for improving light energy utilization rate of atmosphere light

Technical Field

The invention relates to the technical field of automobiles, in particular to an optical system for improving the utilization rate of atmosphere light energy.

Background

With the advancement of the times and the pursuit of aesthetics, the number and types of automotive interior lights have increased dramatically. The atmosphere lamp generally uses an LED as a light source, and light is guided by emitting light from the side of the light guide. But the side-emitting efficiency of the light guide is limited and a significant portion of the light escapes through the end of the light guide. And with the continuous increase of the length of the light guide, the light power is continuously lost, and the light-emitting brightness of the light guide at the far end and the near end is easy to generate uneven phenomenon.

There are two main current solutions.

First, as shown in fig. 1, in addition to the light source module 11 disposed at one end of the light guide 10, a light source module 12 of one LED is added at the far-end thereof as a compensation light source, thereby forming a double-ended light source.

The second scheme is shown in fig. 2, and the long light guide is split into two

short light guides

21 and 22 for lighting the independent LED light sources (

light source modules

23 and 24 in the figure), or the scheme can be expanded into a split light guide scheme of multiple independent light sources and short light guides.

The surface smoothness of the light guide is optimized on the basis of the above, so that the light loss is reduced.

However, the above two prior arts have the following disadvantages:

first, increasing the number of light source modules and light guides leads to a significant increase in cost;

secondly, the overlapped parts of the two light guides have bright spots which cannot be eliminated, the uniformity is poor, the visual effect can be optimized only by adding a scattering lampshade to the indirect atmosphere lamp, and the bright spots are obvious even if the scattering lampshade is added to the direct atmosphere lamp;

thirdly, different light sources have certain color difference, so that the color consistency of the atmosphere lamp is poor;

fourth, increasing the smoothness of the light guide only allows light escaping from the side walls of the light guide, which accounts for a very small fraction of the escaping light, and essentially most of the light still escapes from the light exit surface at the far end.

Disclosure of Invention

In view of the above problems, the present invention provides an atmosphere lamp optical system for improving light energy utilization rate, which can realize recycling of light emitted from the end of a light guide and improve light energy utilization rate.

It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure.

In order to achieve the above object, the present invention provides an optical system for increasing the light energy utilization rate of an atmosphere lamp, wherein the optical system comprises:

a light guide and a light source module disposed at a first end of the light guide;

the reflecting system is arranged at the second end of the light guide and comprises a convex lens module and a light condensing module which are fixedly arranged by a sealing sleeve;

the convex lens module and the light condensation module are in a confocal point, and the light condensation module collects reflected light, converges the reflected light at the focal point of the convex lens module, and then emits the reflected light to the convex lens module again to form parallel light to be injected into the light guide.

Preferably, the present invention further provides an optical system for improving the light energy utilization efficiency of an atmosphere lamp, characterized in that,

the light-gathering module comprises a concave mirror.

Preferably, the present invention further provides an optical system for improving the light energy utilization efficiency of an atmosphere light, characterized in that,

the convex lens module includes a first convex lens.

the apex of the maximum light emission angle of the light guide coincides with the focal point of the first convex lens.

the focal length f of the first convex lens is as follows:

wherein r is the curvature radius of the convex lens, d is the convex lens thickness, f ₁ And f ₂ The left and right focal lengths of the convex lens, respectively.

focal length f of the concave mirror ₃ Is k times the focal length f of the convex lens, wherein:

where a is the maximum light emission angle and L is the maximum width of the light guide in the vertical direction.

the concave mirror is a spherical concave mirror, and the relation between the focal length and the curvature radius R of the concave mirror meets the following requirements:

f ₃ ＝R/2。

the convex lens module further comprises a second convex lens which is arranged between the first convex lens and the concave mirror, the second convex lens and the concave mirror are in a confocal point, and the first convex lens and the second convex lens are in a confocal point.

the medium between the convex lens module and the light-gathering module in the sealing sleeve comprises air.

the material of the convex lens comprises PMMA.

The optical system can meet the light-emitting uniformity of the long light guide atmosphere lamp under the condition of not increasing a light source module or a light guide, has lower cost, ensures the consistency of colors, improves the light utilization rate of the atmosphere lamp, and has certain flexibility.

Drawings

Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Further, although the terms used in the present disclosure are selected from publicly known and used terms, some of the terms mentioned in the specification of the present disclosure may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present disclosure is understood, not simply by the actual terms used but by the meaning of each term lying within.

The above and other objects, features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a prior art double-ended light source comprising an optical system;

FIG. 2 is a schematic diagram of a prior art split lightguide making up an optical system;

FIG. 3 is a schematic diagram of the optical system in accordance with a preferred embodiment of the present invention;

FIG. 4 is a partially exploded schematic view of the reflection system of FIG. 3;

FIG. 5 is a schematic diagram of the arrangement of the reflection system in the preferred embodiment of FIG. 3;

FIG. 6 is a schematic diagram of the incident light path in the preferred embodiment of FIG. 3;

FIG. 7 is a schematic diagram of the optical path of the preferred embodiment of FIG. 3 after reflection by a concave mirror;

FIG. 8 is a diagram of the imaging optical path of the convex lens in the embodiment of FIG. 3;

FIG. 9 is a schematic diagram of the constraint relationship of the light guide convex lens and the concave mirror in the embodiment of FIG. 3;

FIG. 10 is a schematic view of the incident light path of a confocal lens group in another preferred embodiment of the invention;

FIG. 11 is a schematic diagram of the reflected light path of the confocal lens group in the preferred embodiment of FIG. 10.

Reference numerals

10 21, 22, 30-light guide

11 12, 23, 24, 31-light source module

32-reflection system

321-concave mirror

322-sealing sleeve

323-convex lens

324-second convex lens

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar scenarios without inventive effort, based on these drawings. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be discussed further in subsequent figures.

In the description of the present application, it is to be understood that the positional or orientational relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal" and "top, bottom" and the like are generally based on the positional or orientational relationships indicated in the drawings and are provided only for convenience of description and simplicity of description, and that these directional terms, where not stated to the contrary, are not intended to indicate and imply that the device or element so indicated must have a particular orientation or be constructed and operated in a particular orientation and therefore should not be construed as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used to distinguish the corresponding components, and unless otherwise noted, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present application. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.

FIG. 3 is a schematic diagram of the components of the optical system for improving the energy utilization efficiency of the atmosphere light according to the present invention.

The system comprises a light guide 30, a light source module 31 and a reflection system 32. Wherein the light guide 30 is a transparent material.

Fig. 4 further illustrates an exploded view of the reflective system 32.

The reflection system 32 comprises a set of confocal convex lens 323 and concave lens 321 combined optical system and a sealing sleeve 322.

The curvature of the concave mirror 321 is smaller than the surface curvature of the convex lens 323, and the peak of the maximum light emission angle a of the light guide 30 coincides with the other side focal point of the convex lens 323. As shown in fig. 5.

Fig. 6 and 7 are schematic diagrams illustrating an incident light path and a reflected light path via a concave mirror, respectively, and in conjunction with the light paths, are specifically described as follows:

because the peak of the maximum light-emitting angle a of the light guide 30 is coincident with the focus of the convex lens 323, the emergent light of the light guide 30 firstly forms a bundle of parallel light through the convex lens 323, and is incident into the concave mirror 321 in parallel as shown in fig. 6, and then the concave mirror 321 collects the reflected light and converges the light at the common focus F, and then the light is incident into the convex lens 323 again, and the light is refracted by the convex lens 323 to form parallel light and is injected into the light guide again, so that the escaping light of the system is reduced, and the light energy utilization rate of the system is improved.

Meanwhile, because the curvature of the concave mirror 321 is smaller than the curvature of the surface of the convex lens 323, that is, the curvature radius of the surface of the concave mirror 321 is larger than that of the surface of the convex lens 323, and the distance from the convex lens 323 to the common focus F is shorter than that of the concave mirror 321, the light incident area of the convex lens 323 is relatively smaller, more concentrated parallel light can be formed, and the light energy utilization rate is further improved.

In the sealing sleeve 322, the working medium is air as a default, but different optical media can be injected according to actual working requirements, so as to adjust the reflection efficiency of the system and realize different working effects.

The theoretical analysis of the focal length constraints of the confocal lens system in the reflection system 32 is as follows:

referring to the relationship diagram of the image forming light path of the convex lens shown in FIG. 9, P is the light emitting point at any position on the axis, and P 'is the final image forming position, P' ₁ To pass through O only ₁ Imaging position of the face.

With O ₁ Consider O as a reference point ₁ The object-image relationship of the surface, i.e. the refractive index of the image surface is the refractive index nL of the lens, and the image point is P' ₁ And n is the refractive index of the external medium of the reflector, and comprises:

analogously, with O ₂ Consider O as a reference point ₂ The object-image relationship of the surface is that the last point is P ', and the image point is P' which is the object point and the image point of the surface considering that the light path is reversibleThe point of symmetry P2 about the O2 plane should be equal to P' ₁ Coincidence, n' is the refractive index of the filling medium in the reflector, and the image plane refractive index is the lens refractive index, and the method comprises the following steps:

considering that the convex lens 323 used in this embodiment has the same radius of curvature on both surfaces, that is, (r 1= r2= r), the light emitting point P is in focus, the emitted light is parallel light, and the thickness d of the convex lens 323 is not negligible, so S is made ₁ ＝f ₁ ，S′ ₂ = ∞ the two formulae above can be:

simplification can result in:

similarly, when light is emitted from point P, there is S' ₂ ＝f ₂ ，S ₁ = ∞ and the above two formulae can be:

further simplification can be made depending on the set refractive index.

Since the default lens has air as the medium at both ends, the refractive index n is about 1, the refractive index nL of the lens material PMMA (which is called polymethyl methacrylate) is about 1.5, and the focal length f of the lens can be obtained by the following formula:

next, the focal point of the spherical concave mirror 321 in the optical systemDistance f ₂ And curvature radius R relationship:

f＝R/2 (7)

referring to FIG. 10, the maximum light emission angle a of the light guide 30 and the focal length f of the convex lens 323 are shown ₁ ，f ₂ And concave mirror 321 focal length f ₃ The spherical center of spherical concave mirror 321 is the point O' in the constraint relationship therebetween.

As can be seen from the law of reflection of light and the nature of the circle,

the corresponding central angle & lt BO' Q is b/2.

In the isosceles triangle BO' Q, there are, by the cosine theorem:

in the right triangle BPQ there are:

then there are:

due to right triangle COF ₂ And right triangle BDF ₂ Similarly, there are:

due to OF ₂ ＝f ₂ ,OC＝L/2，DF ₂ H has:

at right triangle AOF ₁ The method comprises the following steps:

in the right triangle BO' P there are:

default that the medium at both ends of the convex lens is air, f ₁ ＝f ₂ = f, which can be obtained from the above formula:

the minimum radius h of the convex lens is:

setting the focal length f of a concave mirror ₃ K times the focal length f of the convex lens, due to

Then there are:

thereby obtaining the maximum light-emitting angle a of the light guide, the focal length f of the convex lens and the focal length f of the concave lens ₃ The constraint relationship between them.

Fig. 10 and 11 show another preferred embodiment of the present invention, in which a second convex lens 324 is added to the reflecting system on the basis of a convex lens 323, and is disposed between the convex lens 323 and the concave mirror 321, and the second convex lens 324 is confocal with both the convex lens 232, i.e., the focal point F1 in fig. 11, and the concave mirror 321, i.e., the focal point F2 in fig. 10. The purpose of the design is to effectively collect emergent light of the light guide and return the emergent light to the light guide through the combined design, so that the light utilization rate of the atmosphere lamp is improved.

It should be noted that the confocal lens group can also increase the number of convex lenses to achieve better light collection effect. Concave mirror 321 may be replaced with other light-concentrating structures.

In summary, the optical system for improving the light energy utilization rate of the atmosphere lamp has the following technical effects:

firstly, the light-emitting uniformity of the long light guide atmosphere lamp can be met under the condition of not increasing a light source module or a light guide, and the cost is lower;

secondly, the problem of chromatic aberration caused by different light sources and light guides is avoided, and the color consistency is better;

thirdly, through the combined design of the confocal convex lens and the concave lens, emergent light at the tail end of the light guide is effectively collected and returns to the light guide, and the light utilization rate of the atmosphere lamp is improved;

fourthly, through the replacement of the working medium of the lens system cavity, the reflection efficiency of the system is adjusted, different working effects are realized, certain flexibility is achieved, and the parameters of the lens group, the number of the lenses and the arrangement positions of the lenses can be calculated by combining the target effect and the actual space and combining the formula.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, adaptations, and alternatives may occur to one skilled in the art without departing from the scope and spirit of the present application. Such alterations, modifications, and improvements are intended to be suggested herein and are intended to be within the spirit and scope of the exemplary embodiments of this application.

Also, the present application uses specific words to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features are required than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single disclosed embodiment.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiment. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preservation approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

Although the present application has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the above embodiments are provided for illustration only, and that various equivalent changes and substitutions may be made without departing from the spirit of the application, and therefore, it is intended that all changes and modifications to the above embodiments within the spirit of the application fall within the scope of the claims of the application.

Claims

1. An optical system for improving the energy utilization efficiency of atmosphere light, the optical system comprising:

the convex lens module and the light condensing module have a common focus, and the light condensing module collects reflected light, converges the reflected light at the focus of the convex lens module, and then enters the convex lens module again to form parallel light to be injected into the light guide.

2. The optical system for improving energy efficiency of an ambience light as claimed in claim 1,

the light-gathering module comprises a concave mirror.

3. The optical system for improving atmosphere lighting energy utilization rate according to claim 2,

the convex lens module includes a first convex lens.

4. The optical system for improving energy efficiency of an ambience light as claimed in claim 3,

the vertex of the maximum light emission angle of the light guide coincides with the focal point of the first convex lens.

5. The optical system for improving atmosphere light energy utilization rate according to claim 4, wherein the focal length f of the first convex lens is as follows:

wherein r is a curvature radius of the convex lens, d is a convex lens thickness, f ₁ And f ₂ The left and right focal lengths of the convex lens, respectively.

6. The optical system for improving atmosphere lighting energy utilization rate according to claim 5, wherein the optical system is characterized in thatFocal length f of the concave mirror ₃ Is k times the focal length f of the convex lens, wherein:

7. The optical system for improving the atmosphere lighting energy utilization rate according to claim 6, wherein the concave mirror is a spherical concave mirror, and the relationship between the focal length and the curvature radius R of the concave mirror satisfies the following relationship:

f ₃ ＝R/2。

8. the optical system for improving atmosphere lighting energy utilization rate according to claim 7,

9. The optical system for improving atmosphere lighting energy utilization rate according to claim 8,

10. The optical system for improving energy efficiency of an ambience light as claimed in claim 9,

the material of the convex lens comprises PMMA.