Light guide element, vehicle lamp and vehicle

Abstract

The present invention relates to a vehicle lamp, and discloses a light guide element, comprising a plurality of light guide units (1), wherein a single light guide unit (1) comprises a light collecting portion (101), a light guiding portion (102), and a light emitting portion (103) in sequence along the light propagation direction, wherein a total reflection portion is formed on the light guiding portion (102), and the total reflection portion is arranged so that the collimated light emitted by the light collecting portion (101) is reflected by the total reflection portion for multiple times and then emitted to the light emitting portion (103). The present invention also discloses a vehicle lamp and a vehicle comprising the light guide element. The light guide element of the present invention has a simple structure, flexible shape, high light utilization rate, and high space utilization rate.

Description

Technical Field

[0001] The present invention relates to automotive headlights, and more particularly, to a light guide element. In addition, the present invention also relates to a headlight and a vehicle including the light guide element. Background Art

[0002] Currently, in the existing headlight designs, designers have been more inclined to choose LEDs as light sources, and the shape design of the light guide elements used in conjunction with LED light sources has become more and more flexible, with a relatively high space utilization rate.

[0003] In the design process of the light guide element used in conjunction with the LED light source, the principles of refraction and total internal reflection of light are generally utilized. Currently, there are three relatively common design schemes in the field of headlight design: First, a light pipe 3 as shown in Figure 1 can be adopted. Its working principle is as shown in Figure 2 . Light enters from one end of the light pipe 3 and propagates through total internal reflection inside until it reaches the other end of the light pipe 3. Among them, in order to obtain a relatively uniform light-emitting effect, a microstructure 301 needs to be added to the back surface of the light pipe 3 opposite to the light-emitting surface. However, since the light pipe 3 is a tubular structure, the effective light-emitting area is small, so the light utilization efficiency is generally low, usually only about 25%. In order to meet the light intensity requirements, it is necessary to increase the power of a single LED light source, which poses a new challenge to the design of the headlight space structure. Second, as shown in Figure 3 and Figure 4 , a scheme of densely arranging multiple LED light sources can be adopted. The light directly shines through the light distribution lens 4, and the light emitted by multiple LED light sources intersects with each other to achieve uniform and large-area light emission. However, this design requires a relatively large number of LED light sources, which will significantly increase the cost of the system. In addition, as can be seen from Figure 4 , according to the light-emitting characteristics of the LED light source 2, assuming that the half-value angle θ is 120 degrees, the two sides of the half-value angle θ represent the boundaries of the light rays. When the distance L1 from the center of the LED light source 2 to the light-incident surface of the light distribution lens 4 is 6 mm, the diameter L2 of the illuminated area is about 21 mm. If more areas need to be illuminated, the distance L1 needs to be increased, that is, the overall size in the emission direction is increased. However, in actual design, due to the space limitation of the headlight structure, it is difficult to increase the overall size. Generally, more LED light sources 2 are arranged to illuminate more areas to achieve large-area light emission. Third, as shown in Figures 5 to 7 , a traditional condenser cup structure 5 can also be adopted. This condenser cup structure 5 is generally a rotational symmetric body around a certain optical axis. For some occasions where the light-emitting surface or the light distribution requirement is square, the rotational body must be cut (as shown in Figure 7 ), which reduces the light utilization efficiency. At the same time, this traditional condenser cup structure 5 also requires a relatively large number of LED light sources.

[0004] Based on the above reasons, it is difficult for the existing technology to effectively ensure that the light guide element used in conjunction with the LED light source has a simple structure, occupies a small space, has high optical efficiency, and can also achieve a large area of ​​luminous effect. SUMMARY OF THE INVENTION

[0005] The problem to be solved in the first aspect of the present invention is to provide a light guide element, which has a simple structure, occupies a small space, has a high optical efficiency and can achieve a large area of ​​luminous effect.

[0006] In addition, the problem to be solved in the second aspect of the present invention is to provide a vehicle lamp, the light guide element of which has a simple structure, occupies a small space, and has a high optical efficiency.

[0007] Furthermore, the problem to be solved in the third aspect of the present invention is to provide a vehicle whose headlights are small in size and high in optical efficiency.

[0008] In order to solve the above technical problems, the first aspect of the present invention provides a light guide element, including a plurality of light guide units, wherein a single light guide unit includes a light collecting portion, a light guiding portion and a light emitting portion in sequence along the light propagation direction, and a total reflection portion is formed on the light guiding portion, and the total reflection portion is arranged so that the collimated light emitted from the light collecting portion is reflected by the total reflection portion for multiple times and then emitted to the light emitting portion.

[0009] As a preferred embodiment, the total reflection portion includes a first total reflection surface portion and a second total reflection surface portion, and the collimated light emitted by the focusing portion includes a first light beam emitted from the front half of the focusing portion and a second light beam emitted from the rear half of the focusing portion. The first total reflection surface portion can reflect the main part of the first light beam to the light exit portion, and the second total reflection surface portion can reflect the main part of the second light beam to the light exit portion.

[0010] Preferably, the first total reflection surface portion includes a first total reflection surface and a third total reflection surface, the second total reflection surface portion includes a second total reflection surface and a fourth total reflection surface, the first total reflection surface and the second total reflection surface are connected, the third total reflection surface and the fourth total reflection surface are connected, and the fourth total reflection surface and the second total reflection surface are connected, wherein the first total reflection surface is suitable for reflecting a portion of the first light beam to the light exit portion and emitting from the light exit portion, and reflecting a second portion of the first light beam to the third total reflection surface and then emitting from the light exit portion; the second total reflection surface is suitable for reflecting the light of the second light beam to the fourth total reflection surface and then emitting from the light exit portion.

[0011] Preferably, the first total reflection surface is a half conical surface curved forward along the light-emitting direction, and the vertex of the first total reflection surface is the intersection point of the optical axis passing through the light condensing part and the upper surface of the light guiding part.

[0012] More preferably, the included angle between the two side edges of the first total reflection surface is 75° - 105°.

[0013] Furthermore, the second total reflection surface is a plane.

[0014] As another preferred embodiment, the number of the second total reflection surfaces of a single light guiding unit is two, and the two second total reflection surfaces are respectively connected to the two side edges of the first total reflection surface and are tangent to the first total reflection surface.

[0015] As yet another preferred embodiment, the lateral cross-section of the third total reflection surface is a parabolic segment, and the focus of the parabolic segment is the point where the vertex of the first total reflection surface is projected onto the lower surface of the light guiding part.

[0016] More preferably, the fourth total reflection surface is a plane, and the fourth total reflection surface is connected to the rear end of the third total reflection surface.

[0017] Further preferably, the included angle between the fourth total reflection surface and the plane passing through the optical axis of the light condensing part and extending in the front and rear directions is 30° - 60°.

[0018] As a specific structural form, the longitudinal cross-sections of the third total reflection surface and the fourth total reflection surface are both straight lines extending in the up and down directions.

[0019] More specifically, the light condensing part is arranged on the upper surface of the light guiding part.

[0020] As another specific structural form, the light condensing part is a light condensing cup structure, and the outer contour of the light condensing part is a curved surface structure with a gradually increasing diameter from top to bottom along the light propagation direction.

[0021] More specifically, the first total reflection surface part further includes a total reflection hole penetrating through the light guiding part. The lateral cross-section of the total reflection hole is a triangle. The extension line of the lateral cross-section of one surface of the total reflection hole intersects with the optical axis of the light condensing part. The second surface extends along the light-emitting direction. The third surface forms a fifth total reflection surface. The total reflection hole is adapted to reflect the third part of the light rays of the first light beam through the fifth total reflection surface and then emit the light rays from the light-emitting part.

[0022] Further, the light guide part is provided with a refraction hole penetrating the light guide part in the up-down direction. The left and right side surfaces of the refraction hole are planes parallel to the light-emitting direction. The surface of the refraction hole close to the light condensing part is a first arc surface protruding towards the light-emitting direction. The center line of the first arc surface coincides with the optical axis of the light condensing part. The position of the refraction hole opposite to the first arc surface is provided with a second arc surface protruding towards the first arc surface.

[0023] As another specific structural form, the light-emitting parts of the light guide units are formed as a whole, and the light-emitting part is provided with a pattern structure.

[0024] The second aspect of the present invention further provides a vehicle lamp, including a plurality of LED light sources and a light guide element according to any one of the above technical solutions. Each of the LED light sources is arranged corresponding to the light condensing part one by one.

[0025] The third aspect of the present invention further provides a vehicle, and the vehicle includes the vehicle lamp according to the above technical solution.

[0026] Through the above technical solutions, the beneficial effects of the present invention are as follows:

[0027] In the basic technical solution of the present invention, the light guide element includes a plurality of light guide units. A single light guide unit sequentially includes a light condensing part, a light guide part, and a light-emitting part along the light propagation direction. The light guide part is provided with a total reflection part. The light forms collimated light after passing through the light condensing part. The collimated light can be totally reflected multiple times and finally emitted by the light-emitting part, forming a large-area light-emitting effect with high optical efficiency. At the same time, by arranging the light condensing part on the upper part of the light guide part, the size of the light guide element in the front-rear direction can be effectively shortened, and it is not necessary to cut the light condensing part, which can also improve the optical efficiency, and the structural design limitations of the light guide element are smaller.

[0028] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. Description of the Drawings

[0029] Figure 1 is a structural schematic diagram of a specific embodiment of a light guide tube in the prior art;

[0030] Figure 2 is an optical path diagram of a light guide tube in the prior art;

[0031] Figure 3 is a structural schematic diagram of a specific embodiment of a light distribution mirror in the prior art;

[0032] Figure 4 is a cross-sectional view of a specific embodiment of a light distribution mirror in the prior art;

[0033] Figure 5 It is a schematic structural diagram of a specific embodiment of the condenser cup structure of the prior art;

[0034] Figure 6 It is the optical path diagram of the condenser cup structure of the prior art without being cropped;

[0035] Figure 7 It is the optical path diagram of the condenser cup structure of the prior art after a part of it is cropped;

[0036] Figure 8 It is a schematic structural diagram of a specific embodiment of the light guide element of the present invention;

[0037] Figure 9 It is one of the schematic structural diagrams of a specific embodiment of the light guide unit of the present invention;

[0038] Figure 10 It is the second of the schematic structural diagrams of a specific embodiment of the light guide unit of the present invention;

[0039] Figure 11 The optical path diagram of the first light beam seen from the side of the light guide unit of the present invention;

[0040] Figure 12 The optical path diagram of the first light beam seen from the upper side of the light guide unit of the present invention;

[0041] Figure 13 The optical path diagram of the second light beam seen from the rear side of the light guide unit of the present invention;

[0042] Figure 14 The optical path diagram of the second light beam seen from the upper side of the light guide unit of the present invention;

[0043] Figure 15 The schematic structural diagram of a specific embodiment of the refraction hole and the total reflection hole of the present invention;

[0044] Figure 16 is Figure 15 The optical path diagram passing through the refraction hole and the total reflection hole in;

[0045] Figure 17 It is the schematic diagram of the generation process of the first total reflection surface of the present invention;

[0046] Figure 18 It is the schematic diagram of the generation process of the second total reflection surface of the present invention;

[0047] Figure 19 is Figure 18 The top view of;

[0048] Figure 20 It is the schematic diagram of the generation process of the third total reflection surface of the present invention;

[0049] Figure 21 is Figure 20 the top view of;

[0050] Figure 22 is the light ray diagram with a paraboloid as the total reflection surface;

[0051] Figure 23 is the schematic diagram of the generation process of the fourth total reflection surface of the present invention;

[0052] Figure 24 is Figure 23 the top view of;

[0053] Figure 25 is the structural schematic diagram in the generation process of the first total reflection surface, the second total reflection surface, the third total reflection surface, and the fourth total reflection surface of the present invention;

[0054] Figure 26 is Figure 25 the top view of;

[0055] Figure 27 is the schematic diagram of the generation process of the refraction hole and the total reflection hole of the present invention.

[0056] Explanation of reference numerals

[0057] 1 Light guide unit 101 Condensing part

[0058] 102 Light guiding part 1021 Refraction hole

[0059] 1022 Total reflection hole 1023 First total reflection surface

[0060] 1024 Second total reflection surface 1025 Third total reflection surface

[0061] 1026 Fourth total reflection surface 1027 Fifth total reflection surface

[0062] 103 Light emitting part 2 LED light source

[0063] 3 Light pipe 301 Microstructure

[0064] 4 Light distribution mirror 5 Condensing cup structure Detailed implementation manners

[0065] The following will describe in detail the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the following detailed implementation manners.

[0066] First of all, it should be noted that in the following description, some orientation words involved in clearly explaining the technical solution of the present invention, such as "rear", "front", etc., are the meanings analogously obtained according to the orientation indicated by the light-emitting direction of the light guide unit 1. For example, taking a single light guide unit 1 as an example, the end where the light-emitting part 103 of the light guide unit 1 is located is the front end, and vice versa is the rear end. Looking from the rear to the front, the left and right of the light guide unit 1 are the left and right directions, and the up and down as shown in the attached Figure 9 is the up and down direction. In addition, the "light-emitting direction" in the text is the light-emitting direction of the light-emitting part 103 of the light guide unit 1, which extends roughly along the direction perpendicular to the light-emitting surface of the light-emitting part 103, that is, the front and rear directions. The "light propagation direction" is the optical path direction of the light after it is emitted from the LED light source 2, that is, as Figure 11 and Figure 13 shown, the light roughly propagates from top to bottom first and finally from rear to front.

[0067] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0068] As Figures 8 to 10 shown, the present invention provides a light guide element, which includes a plurality of light guide units 1. A single light guide unit 1 sequentially includes a light condensing part 101, a light guiding part 102, and a light-emitting part 103 along the light propagation direction. A total reflection part is formed on the light guiding part 102, and the total reflection part is arranged to enable the collimated light emitted from the light condensing part 101 to be totally reflected by the total reflection part multiple times and then emitted to the light-emitting part 103.

[0069] Preferably, the total reflection part includes a first total reflection surface part and a second total reflection surface part. The collimated light emitted from the light condensing part 101 includes a first light beam emitted from the front half part of the light condensing part 101 and a second light beam emitted from the rear half part of the light condensing part 101. The first total reflection surface part can reflect the main part of the first light beam to the light-emitting part 103, and the second total reflection surface part can reflect the main part of the second light beam to the light-emitting part 103.

[0070] The light collimated by the condenser part 101 is directed to total reflection parts with different structures designed according to the light in different parts, which can effectively improve the optical efficiency. According to the distribution of the light in the condenser part 101, the light in the condenser part 101 is divided into a first light beam and a second light beam by a virtual plane passing through the optical axis of the condenser part 101 and extending in the left-right direction. The light in the front part of the virtual plane is defined as the first light beam, and the light in the rear part is defined as the second light beam. That is, the light emitted from the first half of the condenser part 101 is the first light beam, and the light emitted from the second half is the second light beam. Here, the first total reflection surface part of the present invention can totally reflect the main part of the first light beam and then directly emit it from the light emitting part 103, and the second total reflection surface part reflects the main part of the second light beam to the light emitting part 103. Since there are many factors affecting light propagation, the main part of the present invention can be understood as most of the light under ideal conditions, excluding the light propagation situation in special cases. It can be seen from this that the cooperation of the first total reflection surface part and the second total reflection surface part can emit most of the light from the light emitting part 103, with high optical efficiency and better light emitting effect.

[0071] More preferably, the first total reflection surface part includes a first total reflection surface 1023 and a third total reflection surface 1025, the second total reflection surface part includes a second total reflection surface 1024 and a fourth total reflection surface 1026. The first total reflection surface 1023 is connected to the second total reflection surface 1024, the third total reflection surface 1025 is connected to the fourth total reflection surface 1026, and the fourth total reflection surface 1026 is connected to the second total reflection surface 1024. Among them, the first total reflection surface 1023 is adapted to reflect a part of the light of the first light beam to the light emitting part 103 and emit it from the light emitting part 103, and reflect the second part of the light of the first light beam to the third total reflection surface 1025 and then emit it from the light emitting part 103; the second total reflection surface 1024 is adapted to reflect the light of the second light beam to the fourth total reflection surface 1026 and then emit it from the light emitting part 103.

[0072] It can be seen from Figure 8 that the light guiding element of the present invention includes three light guiding units 1. The light emitting parts 103 of these three light guiding units 1 are formed integrally, which can be understood as these three light guiding units 1 sharing a light emitting surface. After the light is condensed and collimated by the condenser part 101 and then projected to the total reflection part, most of the light can be projected to the total reflection part, and the light is more concentrated and neat, so that the light reflected by the total reflection part can more fully cover the entire light emitting part 103. It can not only achieve the light emitting effect of a large area with fewer LED light sources 2, especially the narrow strip-shaped light emitting effect, with high light utilization rate, but also achieve the appearance shape of the narrow and long light emitting effect of the light guiding element as shown in Figure 8 ​

[0073] It should be noted here that each light-emitting part 103 of each light guide unit 1 is formed integrally, and a pattern structure may be provided on the light-emitting surface of the light guide element. The pattern structure may be a grid pattern as shown in Figure 8 or other forms of pattern structures. The purpose is to adjust the emitted light. No matter what form of pattern structure is adopted, it belongs to the protection scope of the present invention.

[0074] In addition, it can be seen from Figure 9 and Figure 10 that the condensing part 101 is provided on the upper surface of the light guide part 102. The condensing part 101 is a condensing cup structure, and the outer contour of the condensing part 101 is a curved surface structure with a gradually increasing diameter from top to bottom along the light propagation direction.

[0075] Generally, the installation space in the front-rear direction inside the vehicle lamp is relatively tight. However, the condensing part 101 of the present invention is arranged on the upper part of the light guide part 102, which can effectively reduce the front-rear distance of the light guide element, and there is no need to make any cuts to the condensing part 101. The light utilization rate is high, and there is also a relatively large adjustment space for the up-down height of the condensing part 101.

[0076] Next, the advantages of the light guide element of the present invention in reducing the occupied space and improving the optical efficiency will be reflected according to the light propagation path in a single light guide unit 1:

[0077] First of all, it needs to be explained that the virtual straight line extending along the up-down direction and passing through the focus of the condensing part 101 is the optical axis of the condensing part 101. The virtual plane passing through this optical axis and extending along the left-right direction virtually divides the condensing part 101 into front and rear parts. This virtual plane virtually divides the light rays emitted by the LED light source 2 into the light guide part 101 into a first light beam and a second light beam. The first light beam is the light ray located in front of this virtual plane, as shown in Figure 11 and Figure 12 . After the light rays of the first light beam are condensed by the condensing part 101, they are totally reflected to the first total reflection surface 1023. A part of the light rays after being reflected by the first total reflection surface 1023 is directly emitted by the light-emitting part 103, and the other part is emitted to the third total reflection surface 1025 and then totally reflected by the third total reflection surface 1025 and finally emitted by the light-emitting part 103. The second light beam is the light ray located behind this virtual plane, as shown in Figure 13 and Figure 14 . After the light rays of the second light beam are condensed by the condensing part 101, the light rays will be emitted to the second total reflection surface 1024, and then totally reflected by the second total reflection surface 1024 to the fourth total reflection surface 1026 and finally emitted by the light-emitting part 103. It can be seen from this that a single light guide unit 1 of the present invention can emit most of the light rays emitted by the LED light source 2 from the light-emitting part 103, and the light utilization rate is high.

[0078] As a preferred embodiment, the first total reflection surface 1023 is a half conical surface that bends forward along the light-emitting direction of the light guide element, and the vertex of the first total reflection surface 1023 is the intersection point of the optical axis of the light condensing portion 101 and the upper surface of the light guide portion 102.

[0079] More preferably, the included angle between the two side lines of the first total reflection surface 1023 is 75°-105°.

[0080] It should be noted here that the included angle between the two side lines of the first total reflection surface 1023 is 75°-105°, and the preferred included angle is 90°. The first total reflection surface 1023 with this angle can ensure that the light reflected by the first total reflection surface 1023 can be emitted horizontally. To understand it more simply, the two side lines of the first total reflection surface 1023 are the intersection lines after the first total reflection surface 1023 intersects with the second total reflection surface 1024. The two intersection lines intersect at the vertex of the first total reflection surface 1023, and the included angle formed by these two intersection lines is the included angle between the two side lines of the first total reflection surface 1023. And the vertex of the first total reflection surface 1023 is the intersection point of the optical axis of the light condensing portion 101 and the upper surface of the light guide portion 102.

[0081] As another preferred embodiment, the second total reflection surface 1024 is a plane.

[0082] More preferably, the number of the second total reflection surfaces 1024 of a single light guide unit 1 is two. The two second total reflection surfaces 1024 are respectively connected to the two side edges of the first total reflection surface 1023 and are tangent to the first total reflection surface 1023.

[0083] As mentioned above, the two side lines of the first total reflection surface 1023 are the intersection lines after the first total reflection surface 1023 intersects with the second total reflection surface 1024. Now the second total reflection surface 1024 is tangent to the first total reflection surface 1023, and there is a smooth transition between the second total reflection surface 1024 and the first total reflection surface 1023. Although the intersection line cannot be seen, the intersection line does exist.

[0084] As still another preferred embodiment, the lateral cross-section of the third total reflection surface 1025 is a parabolic line segment, and the focus of the parabolic line segment is the point where the vertex of the first total reflection surface 1023 is projected onto the lower surface of the light guide portion 102.

[0085] As a specific structural form, the fourth total reflection surface 1026 is a plane, and the fourth total reflection surface 1026 is connected to the rear end of the third total reflection surface 1025 and extends backward.

[0086] The longitudinal cross-sections of the third total reflection surface 1025 and the fourth total reflection surface 1026 are both straight lines. From this, it can be seen that the third total reflection surface 1025 is a vertical curved surface, while the fourth total reflection surface 1026 is a vertical plane. The shape of any transverse cross-section of the third total reflection surface 1025 and the fourth total reflection surface 1026 is the same.

[0087] More specifically, the included angle between the fourth total reflection surface 1026 and the plane passing through the optical axis of the light condensing part 101 and extending in the front-back direction is 30° - 60°, preferably 45°, so as to ensure that the light reflected by the fourth total reflection surface 1026 can exit horizontally.

[0088] The following is based on Figures 17 to 26 The design processes of the first total reflection surface 1023, the second total reflection surface 1024, the third total reflection surface 1025, and the fourth total reflection surface 1026 will be described.

[0089] In Figure 17 , the vertical line A is the optical axis of the light condensing part 101, the point P is the intersection point of the vertical line A and the upper surface of the light guiding part 102, and the plane C is the plane passing through the vertical line A and extending in the left-right direction. Starting from the point P, a straight line B is made at an angle of 45° with the vertical line A. After rotating the straight line B around the vertical line A, a conical curved surface is formed. The cut-off positions on both sides of the conical curved surface are two intersection lines L where the conical curved surface intersects the plane C. The conical curved surface passing through the straight line L and the straight line B is the first total reflection surface 1023. From this, it can be known that the first total reflection surface 1023 is obtained by rotating the straight line L around the vertical line A by 180°.

[0090] In Figure 18 and Figure 19 , stretching in the direction away from the first total reflection surface 1023 with the straight line L as the boundary, the generated plane is the second total reflection surface 1024, and the number of the second total reflection surfaces 1024 is two.

[0091] In Figure 20 and Figure 21 , the point P is projected downward onto the plane where the lower surface of the light guiding part 102 is located to obtain the point O. Taking O as the focus and taking the lower end point D of L as the starting point, a parabolic line segment DE is made. The distance from the end point E to the virtual straight line passing through the point O and extending in the front-back direction does not exceed 30 mm, that is, as Figure 27The width of the single light guide unit 1 shown does not exceed 60 mm. If the width of the light guide unit 1 is too large, the light rays distributed on the left and right sides of the light guide unit 1 are relatively few, which will cause a dark area at the junction of multiple light guide units 1 and affect the light output effect of the entire light guide element. At the same time, the distance L5 from point E to the projection line of the horizontal tangent MN at the front end of the light condensing part 101 projected onto the lower surface of the light guide part 102 is 0 to 10 mm. A parabolic line segment DE can be determined through point O, point D, and point E. The curved surface formed by stretching the parabolic line segment DE along the up and down direction is the third total reflection surface 1025. Here, the stretching height of the parabolic line segment DE is generally 0.01 mm - 100 mm, and the preferred stretching height is 0.5 mm - 30 mm.

[0092] From Figure 22 It can be seen that assuming that light rays start from the focus of the parabola, after irradiating any point on the parabola and then undergoing total reflection, the reflected light rays are parallel to the axis of symmetry of the parabola. Therefore, it can be seen that the third total reflection surface 1025 can make the light rays emit in the forward direction.

[0093] As Figures 23 to 26 shown, draw a straight line DF through the end point D. The included angle between the straight line DF and the light output direction in the top view (a virtual straight line extending in the front and back direction through point O) is 45°. The plane formed by stretching the straight line DF along the up and down direction is the fourth total reflection surface 1026.

[0094] As Figure 15 and Figure 16 shown, as another specific structural form, the first total reflection surface portion further includes a total reflection hole 1022 penetrating through the light guide part 102. The transverse section of the total reflection hole 1022 is triangular. The extension line of the transverse section of one side of the total reflection hole 1022 intersects with the optical axis of the light condensing part 101. The second side extends along the light output direction. The third side is formed as the fifth total reflection surface 1027. The total reflection hole 1022 is adapted to reflect the third part of the light rays of the first light beam through the fifth total reflection surface 1027 and then emit them from the light output part 103.

[0095] Since a small amount of light rays in the light rays totally reflected by the first total reflection surface 1023 will be emitted from the two side surfaces of the light guide part 102 extending in the front and back directions on the left and right sides, which affects the light utilization rate of the light guide element of the present invention. Therefore, in order to make more collimated light rays emit from the light output part 103, a total reflection hole 1022 is provided on the light guide part 102. The total reflection hole 1022 is a through hole penetrating through the light guide part 102 along the up and down direction. From Figure 16As can be seen, light irradiates on the total reflection hole 1022, and after being totally reflected by the fifth total reflection surface 1027 on the total reflection hole 1022, it is emitted from the light emitting part 103. The fifth total reflection surface 1027 can totally reflect the light that would originally be emitted from the left and right two side surfaces extending along the front and rear directions on both sides of the light guiding part 102 and then emit it from the light emitting part 103, so as to improve the light utilization rate of the light guiding unit 1. From this, it can be seen that the first total reflection surface 1023, the second total reflection surface 1024, the third total reflection surface 1025, the fourth total reflection surface 1026 and the fifth total reflection surface 1027 are configured to enable as much light as possible incident on them to undergo total reflection, and all the light after these total reflections can be emitted from the light emitting part 103, with a higher light utilization rate and better effect.

[0096] More specifically, the light guiding part 102 is provided with a refraction hole 1021 penetrating through the light guiding part 102 in the up and down direction. The left and right side surfaces of the refraction hole 1021 are planes parallel to the light emitting direction. The surface of the refraction hole 1021 close to the light condensing part 101 is a first arc surface protruding towards the light emitting direction, and the center line of the first arc surface coincides with the optical axis passing through the light condensing part 101. A second arc surface is arranged at a position opposite to the first arc surface on the refraction hole 1021, and the second arc surface protrudes towards the first arc surface. When the light passes through the first arc surface of the refraction hole 1021 close to the light condensing part 101, it does not refract and directly irradiates on the second arc surface of the refraction hole 1021 far from the light condensing part 101, and is collimated and emitted after passing through the second arc surface. The refraction hole 1021 can make the light incident on the first arc surface more convergent when being emitted from the light emitting part 103, and can meet the illuminance requirement. Here, the minimum distance between these two arc surfaces is 0.01 - 20 mm. And the left and right sides of the refraction hole 1021 are two planes parallel to the light emitting direction. Therefore, these two planes basically have no influence on the light.

[0097] The following is based on Figure 27 Describe the design process of the refraction hole 1021 and the total reflection hole 1022.

[0098] First, connect points Q1, Q2, Q3, and Q4 to form a closed-loop graph. Stretching this closed-loop graph along the up and down direction can obtain the refraction hole 1021. Among them, there is a curve F between point Q1 and point Q2 that is concentric with the outer edge of the light condensing part 101, and the distance between them is 1 - 20 mm. According to the properties of the circle, when the light passes through this curve F, it does not refract. Between point Q3 and point Q4 is a smooth curve G. When the light reaches this curve G, it is collimated and emitted to make the light more convergent and meet the illuminance requirement. The minimum distance range between curve F and curve G is 0.01 - 20 mm. Between point Q1Q4 and point Q2Q3 are straight line segments parallel to the light emitting direction of the light guiding unit 1.

[0099] Secondly, draw a straight line H passing through point D and parallel to the light-emitting direction; connect point O and point E to draw a straight line I, and the intersection of H and I is Q5. With point O as the focus, draw a parabola J passing through point Q5. The distance from point Q5 to the virtual straight line passing through point O and extending in the front-rear direction is L3, and point Q7 is a point on the parabola J, and its distance to the virtual straight line passing through point O and extending in the front-rear direction is L4. The value range of L3 is 0.1 - 20 mm, L3 < L4, and generally 1 / 4 <= L3:L4 <= 1 / 2 is appropriate. After determining point Q7, draw a straight line K passing through point Q7 and parallel to the light-emitting direction of the light guide unit 1, and the intersection of the straight line I and the straight line K is point Q6. Connect Q5, Q6, and Q7 to form a triangle, and stretch this triangle along the up-down direction to obtain the total reflection hole 1022.

[0100] In addition, the present invention also provides a vehicle lamp, which includes a plurality of LED light sources 2 and the light guide element according to any one of the above technical solutions, and each of the LED light sources 2 is arranged in one-to-one correspondence with the light condensing part 101.

[0101] In addition, the present invention also provides a vehicle, which has the vehicle lamp according to the above technical solution.

[0102] As can be seen from the above description, the light guide element of the present invention includes a plurality of light guide units 1. Each single light guide unit 1 sequentially includes a light condensing part 101, a light guide part 102, and a light emitting part 103 along the light propagation direction. The light guide part 102 is provided with a total reflection part, and the total reflection part is arranged to enable the collimated light emitted from the light condensing part 101 to be totally reflected by the total reflection part multiple times and then emitted to the light emitting part 103. The light guide element of the present invention uses the total reflection part to totally reflect the collimated light emitted from the light condensing part 101 and then emit it from the light emitting part 103, and uses the refraction holes 1021 and the total reflection holes 1022 provided on the light guide part 102, so that while the light is more converged, the light emitted from the left and right side surfaces of the light guide unit 1 can be minimized, the light utilization rate is high, and the light emitting effect is good.

[0103] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0104] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. In order to avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0105] In addition, any combination can be made among various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A light guide element, characterized in that: The invention comprises a plurality of light guide units (1), wherein a single light guide unit (1) comprises a light focusing portion (101), a light guide portion (102) and a light emitting portion (103) in sequence along the light propagation direction; a total reflection portion is formed on the light guide portion (102); the total reflection portion comprises a first total reflection portion and a second total reflection portion; the first total reflection portion comprises a first total reflection surface (1023) and a third total reflection surface (1025); the second total reflection portion comprises a second total reflection surface (1024) and a fourth total reflection surface (1026); the first total reflection surface (1023) and the second total reflection surface (1024) are connected; the third total reflection surface (1025) and the fourth total reflection surface (1026) are connected; the fourth total reflection surface (1026) and the second total reflection surface The fourth total reflection surface (1026) is connected to the rear end of the third total reflection surface (1025); the first total reflection surface (1023) is suitable for reflecting a part of the light of the first light beam to the light emitting portion (103) and emitting it from the light emitting portion (103); and reflecting a second part of the light of the first light beam to the third total reflection surface (1025) and then emitting it from the light emitting portion (103); the second total reflection surface (1024) is suitable for reflecting the light of the second light beam to the fourth total reflection surface (1026) and then emitting it from the light emitting portion (103); the total reflection portion is arranged so that the collimated light emitted from the focusing portion (101) is emitted to the light emitting portion (103) after being totally reflected by the total reflection portion for multiple times.

2. The light guide element according to claim 1, characterized in that The collimated light emitted by the focusing portion (101) includes a first light beam emitted from a front half of the focusing portion (101) and a second light beam emitted from a rear half of the focusing portion (101); the first total reflection surface portion is capable of reflecting a main part of the first light beam to the light exit portion (103); and the second total reflection surface portion is capable of reflecting a main part of the second light beam to the light exit portion (103).

3. The light guide element according to claim 1, characterized in that The first total reflection surface (1023) is a semi-conical surface that bends forward along the light emitting direction, and the vertex of the first total reflection surface (1023) is the intersection of the optical axis of the focusing portion (101) and the upper surface of the light guiding portion (102).

4. The light guide element according to claim 2, characterized in that: The included angle between the two side edges of the first total reflection surface (1023) is 75°-105°.

5. The light guide element according to claim 2, characterized in that: The second total reflection surface (1024) is a plane.

6. The light guide element according to claim 5, characterized in that The number of the second total reflection surfaces (1024) of a single light guide unit (1) is two, and the two second total reflection surfaces (1024) are respectively connected to the two side edges of the first total reflection surface (1023) and are tangent to the first total reflection surface (1023).

7. The light guide element according to claim 3, characterized in that: The transverse section of the third total reflection surface (1025) is a parabola segment, and the focus of the parabola segment is the point where the vertex of the first total reflection surface (1023) is projected onto the lower surface of the light guide portion (102).

8. The light guide element according to claim 3, characterized in that: The fourth total reflection surface (1026) is a plane.

9. The light guide element according to claim 8, characterized in that: The included angle between the fourth total reflection surface (1026) and a plane passing through the optical axis of the light focusing portion (101) and extending in the front-rear direction is 30°-60°.

10. The light guide element according to any one of claims 1 to 9, characterized in that: The longitudinal sections of the third total reflection surface (1025) and the fourth total reflection surface (1026) are both straight lines extending in the up-down direction.

11. The light guide element according to any one of claims 1 to 9, characterized in that: The light focusing portion (101) is arranged on the upper surface of the light guiding portion (102).

12. The light guide element according to any one of claims 1 to 9, characterized in that: The light focusing portion (101) is a light focusing cup structure, and the outer contour of the light focusing portion (101) is a curved surface structure with a diameter gradually increasing from top to bottom along the light propagation direction.

13. The light guide element according to any one of claims 1 to 9, characterized in that: The first total reflection surface portion further comprises a total reflection hole (1022) penetrating the light guiding portion (102); the transverse section of the total reflection hole (1022) is a triangle; an extension line of the transverse section of one side of the total reflection hole (1022) intersects with the optical axis of the light focusing portion (101); the second side extends along the light emitting direction; the third side forms a fifth total reflection surface (1027); the total reflection hole (1022) is suitable for reflecting the third part of the first light beam through the fifth total reflection surface (1027) and then emitting it from the light emitting portion (103).

14. The light guide element according to any one of claims 1 to 9, characterized in that: The light guide portion (102) is provided with a refraction hole (1021) penetrating the light guide portion (102) in the up-down direction, the left and right side surfaces of the refraction hole (1021) are planes parallel to the light emitting direction, the surface of the refraction hole (1021) close to the light focusing portion (101) is a first arc surface protruding toward the light emitting direction, the center line of the first arc surface coincides with the optical axis passing through the light focusing portion (101), and the position of the refraction hole (1021) opposite to the first arc surface is arranged as a second arc surface, and the second arc surface protrudes toward the first arc surface.

15. The light guide element according to any one of claims 1 to 9, characterized in that: The light emitting portions (103) of each light guide unit (1) are formed as one body, and a pattern structure is provided on the light emitting portion (103).

16. A vehicle lamp, characterized in that: It comprises a plurality of LED light sources (2) and a light guide element according to any one of claims 1 to 15, wherein each of the LED light sources (2) is arranged in one-to-one correspondence with the light focusing portion (101).

17. A vehicle, characterized in that: Comprising the vehicle light according to claim 16.

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