Optical system for improving the light energy utilization of atmosphere lamps

Abstract

The application provides an optical system for improving light energy utilization of atmosphere light, which comprises a light guide and a light source module, the light source module is arranged at a first end of the light guide, a reflection system is arranged at a second end of the light guide, the reflection system comprises a convex lens module and a condensing module which are fixed by a sealing sleeve, wherein the convex lens module and the condensing module have a common focal point, the condensing module collects reflected light and converges the reflected light at the focal point of the convex lens module, and then the reflected light is incident on the convex lens module again to form parallel light which is injected into the light guide. The optical system of the application can meet the light emission uniformity of long light guide atmosphere light without increasing the light source module or the light guide, has lower cost, ensures color consistency, improves the light utilization of atmosphere light, and has certain flexibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automotive technology, in particular to an optical system for improving the light energy utilization rate of an ambient light. BACKGROUND

[0002] With the progress of the times and the pursuit of aesthetics, the number and types of ambient light in car interiors have greatly increased. Ambient light usually uses LEDs as light sources to achieve light guiding through light guiding side emission. However, the side emission efficiency of the light guide is limited, and a large part of the light escapes through the end of the light guide. As the length of the light guide increases, the light power is continuously consumed, and the light emission brightness of the light guide at the far and near ends is prone to unevenness.

[0003] There are two main solutions to this problem.

[0004] The first solution is shown in FIG. 1, which adds a light source module 12 as a compensation light source at the far end of the light guide 10 in addition to the light source module 11 at one end of the light guide 10, thereby forming a double-end light source solution. Figure 1

[0005] The second solution is shown in FIG. 2, which splits the long light guide into two short light guides 21 and 22 with independent LED light sources (light source modules 23 and 24) for lighting, which can also be expanded into a split light guide solution with multiple independent light sources and short light guides. Figure 2

[0006] On this basis, the surface finish of the light guide can be optimized to reduce light loss.

[0007] However, the above two existing technologies have the following disadvantages:

[0008] First, increasing the number of light source modules and light guides will significantly increase the cost;

[0009] Second, the overlapping part of the two light guides will have a bright spot that cannot be eliminated, and the uniformity is not good. Indirect ambient light must increase a scattering lampshade to optimize the visual effect. For direct ambient light, even if a scattering lampshade is added, the bright spot will still be quite obvious;

[0010] Third, different light sources have certain color differences, resulting in poor color consistency of the ambient light;

[0011] Fourth, increasing the smoothness of the light guide can only utilize the light that escapes from the side wall of the light guide, which only accounts for a very small part of the escaped light. Essentially, most of the light still escapes from the light emission surface at the far end. SUMMARY

[0012] ​​In view of the above problems, the present application provides an ambient light optical system for improving light energy utilization, which can realize recycling of light emitted from the end of the light guide and improve light energy utilization efficiency.

[0013] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the present disclosure.

[0014] In order to achieve the above-mentioned purpose, the present application provides an optical system for improving light energy utilization of an ambient light, characterized in that the optical system comprises:

[0015] a light guide and a light source module, the light source module being arranged at the first end of the light guide;

[0016] a reflection system arranged at the second end of the light guide, the reflection system comprising a convex lens module and a condensing module arranged by a sealing sleeve;

[0017] wherein the convex lens module and the condensing module share a common focal point, the condensing module collects reflected light converging at the focal point of the convex lens module, and then the reflected light is incident on the convex lens module again to form parallel light injected into the light guide.

[0018] Preferably, the present application further provides an optical system for improving light energy utilization of an ambient light, characterized in that,

[0019] the condensing module comprises a concave mirror.

[0020] Preferably, the present application further provides an optical system for improving light energy utilization of an ambient light, characterized in that,

[0021] the convex lens module comprises a first convex lens.

[0022] Preferably, the present application further provides an optical system for improving light energy utilization of an ambient light, characterized in that,

[0023] the vertex of the maximum light emission angle of the light guide coincides with the focal point of the first convex lens.

[0024] Preferably, the present application further provides an optical system for improving light energy utilization of an ambient light, characterized in that,

[0025] the focal length f of the first convex lens is:

[0026]

[0027] wherein r is the radius of curvature of the convex lens, d is the thickness of the convex lens, and f1 and f2 are the left and right focal lengths of the convex lens, respectively.

[0028] Preferably, the present application further provides an optical system for improving the light energy utilization of an atmosphere lamp, characterized in that,

[0029] The focal length f3 of the concave mirror is k times the focal length f of the convex lens, where:

[0030]

[0031] Where a is the maximum light emitting angle, and L is the maximum width of the light guide in the vertical direction.

[0032] Preferably, the present application further provides an optical system for improving the light energy utilization of an atmosphere lamp, characterized in that,

[0033] The concave mirror is a spherical concave mirror, and the relationship between its focal length and the radius of curvature R satisfies:

[0034] f3 = R / 2.

[0035] Preferably, the present application further provides an optical system for improving the light energy utilization of an atmosphere lamp, characterized in that,

[0036] The convex lens module further includes a second convex lens arranged between the first convex lens and the concave mirror, the second convex lens and the concave mirror share a common focal point, and the first convex lens and the second convex lens also share a common focal point.

[0037] Preferably, the present application further provides an optical system for improving the light energy utilization of an atmosphere lamp, characterized in that,

[0038] The medium between the convex lens module and the light collecting module in the sealing sleeve includes air.

[0039] Preferably, the present application further provides an optical system for improving the light energy utilization of an atmosphere lamp, characterized in that,

[0040] The material of the convex lens includes PMMA.

[0041] The optical system of the present application can satisfy the uniformity of long light guide atmosphere lamp emission without increasing the light source module or the light guide, has lower cost, ensures color consistency, improves the light utilization of the atmosphere lamp, and has certain flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0042] Embodiments of the present disclosure will now be described in detail with reference to the drawings. A detailed description of a preferred embodiment of the present disclosure will now be described with reference to the drawings. Wherever possible, the same reference numbers will be used in all drawings to refer to the same or like parts. Furthermore, although the terms used in the present disclosure are selected from generally known and used terms, some of the terms mentioned in the description of the present disclosure can be selected by the applicant in his or her judgment from among the terms in accordance with the practical situation, and can be possibly changed in the description of the present disclosure. Therefore, the terms used in the present disclosure should be understood not simply from the names of the terms but by considering the meaning of the terms in the context of the related description.

[0043] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0044] Figure 1 is a schematic diagram of an optical system composed of a double-ended light source in the prior art;

[0045] Figure 2 is a schematic diagram of an optical system composed of a split light guide in the prior art;

[0046] Figure 3 is a schematic diagram of an optical system composed in a preferred embodiment of the present application;

[0047] Figure 4 is a schematic diagram of a reflection system in Figure 3

[0048] Figure 5 is a schematic diagram of an arrangement of a reflection system in a preferred embodiment of Figure 3

[0049] Figure 6 is a schematic diagram of an incident light path in a preferred embodiment of Figure 3

[0050] Figure 7 is a schematic diagram of a light path after reflection by a concave mirror in a preferred embodiment of Figure 3

[0051] Figure 8 is a schematic diagram of an imaging light path relationship by a convex lens in an embodiment of Figure 3

[0052] Figure 9 is a schematic diagram of a constraint relationship of a light guide, a convex lens and a concave mirror in an embodiment of Figure 3

[0053] Figure 10 is a schematic diagram of an incident light path of a confocal lens group in another preferred embodiment of the present application;

[0054] ​​​​​​Figure 11 is Figure 10 Figure 3 is a schematic diagram of the reflected light path of the confocal lens group in a preferred embodiment of the application.

[0055] Reference numerals

[0056] 10, 21, 22, 30 - light guide

[0057] 11, 12, 23, 24, 31 - light source module

[0058] 32 - reflecting system

[0059] 321 - concave mirror

[0060] 322 - sealed sleeve

[0061] 323 - convex lens

[0062] 324 - second convex lens DETAILED DESCRIPTION

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings described below are only some examples or embodiments of the present application, and for those skilled in the art, the present application can be applied to other similar scenarios without creative labor on the basis of these drawings. Unless the context clearly indicates otherwise or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0064] As shown in the present application and claims, unless the context clearly indicates otherwise or otherwise stated, the words "one", "a", "an", and / or "the" do not specifically refer to the singular, but can also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0065] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and operations. Such an expressly detailed description is not intended to limit the scope of the present application. Further, it is to be understood that such examples and embodiments are provided by way of explanation of the present application, and that other embodiments, examples and modifications thereto can be apparent to those of ordinary skill in the art, and that such other embodiments, examples and modifications thereto are intended to fall within the scope of the present application. In addition, while a particular feature of the application can have been disclosed with respect to only one of several embodiments, such feature can be combined with one or more other features of the other embodiments as to apply to any number of the several embodiments. Other objects, features and advantages of the present application will become apparent from the following detailed description of the application when considered in conjunction with the accompanying drawings.

[0066] In the description of the present application, it is to be understood that the terms such as "front," "back," "inside," "outside," "right," "left," "up," "down," "vertical," "horizontal," "top," "bottom," and the like are terms of convenience and are not to be construed as limiting the present application thereto. The terms "first" and "second" are also used to refer to different elements with the same description. These terms are used in the context of the description to distinguish between different elements with the same description. These terms are not to be construed as limiting the present application thereto. The orientation in structures such as panels, frames, and the like is described herein with respect to the orientation of the components as shown in the drawings. The orientation of the components is not to be construed as limiting the present application thereto.

[0067] For purposes of the description hereinafter, the terms "upper," "lower," "right," "left," "vertical," "horizontal," and the like shall relate to the application as it is shown in the drawings and are used merely for identification in the drawings. The terms "attached," "connected," and "coupled" as used herein refer to the bonding, connecting, and / or coupling of two members together using any of the above techniques, as well as other techniques known to those of ordinary skill in the art. The term "attached" is not limited to the direct connection between two members, but also includes indirect connections via one or more other members.

[0068] In addition, it should be noted that the use of the terms "first", "second" and the like is merely intended to distinguish between similar objects, and does not have a special meaning, and therefore cannot be understood as a limitation on the scope of protection of the present application. In addition, although the terms used in the present application are selected from commonly known terms, some terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and the detailed meaning thereof is described in the relevant part of the description. In addition, the present application is required to be understood not only by the actual terms used, but also by the meaning implied by each term.

[0069] Figure 3 The composition of the optical system of the present application for improving the light energy utilization rate of the atmosphere lamp is illustrated.

[0070] The system comprises a light guide 30, a light source module 31 and a reflection system 32. Among them, the light guide 30 is a transparent material.

[0071] Figure 4 The exploded view of the reflection system 32 is further exploded.

[0072] The reflection system 32 comprises a combination of a set of confocal convex lenses 323 and concave mirrors 321 and a sealing sleeve 322.

[0073] Among them, the curvature of the concave mirror 321 is smaller than the surface curvature of the convex lens 323, and the vertex of the maximum light-emitting angle a of the light guide 30 coincides with the other side focal point of the convex lens 323. As shown in Figure 5 .

[0074] Figure 6 And 7 The schematic diagrams of the incident light path and the reflected light path through the concave mirror are shown respectively, and the specific description is as follows in combination with the light path:

[0075] Since the vertex of the maximum light-emitting angle a of the light guide 30 coincides with the focal point of the convex lens 323, the outgoing light of the light guide 30 first passes through the convex lens 323 to form a parallel light, corresponding Figure 6 As shown, the parallel incident concave mirror 321, then the concave mirror 321 collects the reflected light to converge at the common focal point F, and again incident on the convex lens 323, and the parallel light formed by refraction through the convex lens 323 is injected into the light guide again, thereby reducing the system escape light and improving the light energy utilization rate of the system.

[0076] At the same time, because the curvature of the concave mirror 321 is smaller than the surface curvature of the convex lens 323, that is, the surface curvature radius of the concave mirror 321 is larger than the surface curvature radius of the convex lens 323, the distance of the convex lens 323 from the common focus F is closer than that of the concave mirror 321, so the light ray incidence area of the convex lens 323 is relatively small, which can form more concentrated parallel light, and further improve the light energy utilization rate.

[0077] In the sealing sleeve 322, the cavity part surrounded by the confocal lens composed of the concave mirror 321 and the convex lens 323 is filled with air as the default working medium, but different optical media can be injected according to actual working requirements to adjust the reflection efficiency of the system and achieve different working effects.

[0078] Theoretical analysis of the focal length constraint relationship of the confocal lens system in the reflection system 32 is as follows:

[0079] Please refer to Figure 9 The convex lens imaging light path relationship diagram is shown, wherein P is a light emitting point at any position on the axis, P' is the final imaging position, and P'1 is the imaging position only through the O1 surface.

[0080] Taking O1 as the reference point, the object-image relationship of the O1 surface is considered, that is, the refractive index of the image surface is the refractive index nL of the lens, the image point is P'1, and n is the refractive index of the medium outside the reflector. There is:

[0081]

[0082] Similarly, taking O2 as the reference point, the object-image relationship of the O2 surface is considered. Since the final landing point is P', considering that the light path is reversible, the symmetrical point P2 of the image point about the O2 plane should coincide with P'1 when P' is the object point. n' is the refractive index of the filling medium inside the reflector, and the refractive index of the image surface is the refractive index of the lens. There is:

[0083]

[0084] Considering that the two surface curvature radii of the convex lens 323 used in the technical solution are equal, that is, (r1=r2=r), the light emitting point P is on the focus, and the outgoing light is parallel light, the thickness d of the convex lens 323 cannot be ignored, therefore, S1=f1, S'2=∞, the above two formulas can be simplified as:

[0085]

[0086] Simplifying can obtain:

[0087]

[0088] Similarly, when the light ray is emitted from the P point, S'2=f2, S1=∞, the above two formulas can be simplified as:

[0089]

[0090] Further simplification can be made according to the set refractive index.

[0091] Since the refractive index n of the medium at both ends of the default lens is about 1, and the refractive index nL of the lens material PMMA (full name is polymethyl methacrylate) is about 1.5, the focal length f of the lens can be obtained by introducing the formula:

[0092]

[0093] Next, the focal length f2 of the spherical concave mirror 321 in the optical system and the curvature radius R are related:

[0094] f = R / 2 (7)

[0095] Please refer to Figure 10 , gives the constraint relationship between the maximum light-emitting angle a of the light guide 30 and the focal length f1, f2 of the convex lens 323 and the focal length f3 of the concave mirror 321, and the spherical center of the spherical concave mirror 321 is the O' point.

[0096] From the law of reflection of light and the properties of a circle, The corresponding central angle ∠BO'Q of the circle is b / 2.

[0097] In the isosceles triangle BO'Q, by the cosine law we have:

[0098]

[0099] In the right triangle BPQ, we have:

[0100]

[0101] Then we have:

[0102]

[0103] Since the right triangle COF2 is similar to the right triangle BDF2, we have:

[0104]

[0105] Since OF2 = f2, OC = L / 2, and DF2 = h, we have:

[0106]

[0107] In the right triangle AOF1, we have:

[0108]

[0109] In the right triangle BO'P, we have:

[0110]

[0111] The default convex lens has air medium at both ends, f1 = f2 = f, and the above formula can be obtained:

[0112] The minimum radius h of the convex lens is:

[0113]

[0114] The focal length f3 of the concave mirror is set to k times the focal length f of the convex lens, and since then:

[0115]

[0116] Thus, the constraint relationship between the maximum light emitting angle a of the light guide, the focal length f of the convex lens, and the focal length f3 of the concave mirror can be obtained.

[0117] Figure 10 And 11 Another preferred embodiment of the present application is given, in which a second convex lens 324 is added to the reflection system based on the convex lens 323, and is arranged between the convex lens 323 and the concave mirror 321. The second convex lens 324 is both in the same focal point as the convex lens 232, such as Figure 11 F1, and also in the same focal point as the concave mirror 321, such as Figure 10 F2. The purpose of such design is to effectively collect the emitted light of the light guide and return it to the light guide through such combination design, thereby improving the light utilization rate of the atmosphere lamp.

[0118] It should be noted that the number of convex lenses in the confocal lens group can be increased to achieve better light collection effect. The concave mirror 321 can also be replaced by other light collecting structures.

[0119] In summary, the optical system for improving the light energy utilization rate of the atmosphere lamp according to the present application has the following technical effects:

[0120] Firstly, the light emitting uniformity of the long light guide atmosphere lamp can be met without increasing the light source module or the light guide, and the cost is lower;

[0121] Secondly, the color difference problem caused by different light sources and light guides is avoided, and the color consistency is better;

[0122] Thirdly, through the combination design of the confocal convex lens and the concave mirror, the emitted light at the end of the light guide is effectively collected and returned to the light guide, thereby improving the light utilization rate of the atmosphere lamp;

[0123] Fourthly, by changing the working medium in the cavity of the lens system, the reflection efficiency of the system is adjusted, different working effects are realized, and certain flexibility is provided. Specifically, the parameters of the lens group, the number of lenses and the arrangement positions thereof can be calculated according to the target effect and the actual space in combination with the foregoing formula.

[0124] The foregoing has described the basic concepts, and it is obvious that the foregoing disclosure of the application is merely an example and does not constitute a limitation on the application for those skilled in the art. Although it is not explicitly stated herein, those skilled in the art can make various modifications, improvements and corrections to the application. Such modifications, improvements and corrections are suggested in the application, and therefore such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the application.

[0125] Meanwhile, specific words are used in the application to describe the embodiments of the application. For example, "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned in different positions in the specification does not necessarily mean the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the application can be properly combined.

[0126] Similarly, it should be noted that, in order to simplify the description of the disclosure of the application and to help understand one or more embodiments of the application, in the foregoing description of the embodiments of the application, various features are sometimes combined into one embodiment, figure or description thereof. However, this method of disclosure does not mean that the features required by the application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the disclosed single embodiment.

[0127] Some embodiments use numbers to describe components, attributes and quantities. It should be understood that such numbers used in the description of the embodiments are, in some examples, modified by the adjectives "about", "approximately" or "substantially". Unless otherwise stated, "about", "approximately" or "substantially" indicates that the stated number allows for a ±20% variation. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that can vary depending on the desired characteristics of the individual embodiments. In some embodiments, numerical parameters should be considered in the context of the number of significant digits and the ordinary rounding off method by which the number might be presented. Although the numerical ranges and parameters setting forth the broad scope of the application in some embodiments are approximations, in specific embodiments, these numerical values are set forth as precisely as possible.

[0128] Although the present application has been described with reference to the current specific embodiments, it is to be recognized that a little modification of the above-described embodiments can occur to those skilled in the art, which will fall within the spirit of the present application. Therefore, it is intended that the scope of the present application be defined by the scope of the claims appended hereto.

Claims

1. An optical system for improving the light energy utilization of an atmosphere light, characterized by, The optical system comprises: a light guide and a light source module, the light source module being arranged at a first end of the light guide; a reflection system arranged at a second end of the light guide, the reflection system comprising a convex lens module and a condensing module arranged by a sealing sleeve; the condensing module comprises a concave mirror, and the convex lens module comprises a first convex lens; wherein the convex lens module and the condensing module share a common focal point, the condensing module collects reflected light converging at the focal point of the convex lens module, and the reflected light is incident on the convex lens module again to form parallel light injected into the light guide; a vertex of a maximum light emitting angle of the light guide coincides with the focal point of the first convex lens.

2. The optical system for improving the light energy utilization of an atmosphere light according to claim 1, characterized in that, The focal length f of the first convex lens is: wherein r is the radius of curvature of the convex lens, d is the thickness of the convex lens, f1 and f2 are the left and right focal lengths of the convex lens, respectively.

3. The optical system for improving the light energy utilization of an atmosphere light according to claim 2, characterized in that, The focal length f3 of the concave mirror is k times the focal length f of the convex lens, wherein: wherein a is the maximum light emitting angle, and L is the maximum width of the light guide in the vertical direction.

4. The optical system for improving the light energy utilization of an atmosphere light according to claim 3, characterized in that, The concave mirror is a spherical concave mirror, and the relationship between the focal length and the radius of curvature R of the concave mirror satisfies: f3 = R / 2.

5. The optical system for improving the light energy utilization rate of an atmosphere lamp according to claim 4, wherein: the convex lens module further comprises a second convex lens arranged between the first convex lens and the concave mirror, the second convex lens shares a common focal point with the concave mirror, and the first convex lens and the second convex lens also share a common focal point.

6. The optical system for improving the light energy utilization rate of an atmosphere lamp according to claim 5, wherein: the medium between the convex lens module and the condensing module in the sealing sleeve comprises air.

7. The optical system for improving the light energy utilization rate of an atmosphere lamp according to claim 6, wherein: the material of the convex lens comprises PMMA.

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