Vehicle-mounted projection system and vehicle

Abstract

The utility model relates to a vehicle-mounted projection system and a vehicle. The system comprises a light source, a first lens, a projection sheet and an imaging lens group which are sequentially arranged along a first direction and are arranged on the same optical axis, the first lens is constructed as a revolving body, and the first lens is provided with an opening and a cavity communicated with the opening; the light source faces the opening; the inner wall surface of the cavity of the first lens is a light-in surface, the circumferential surface of the first lens is a reflecting surface, and the surface part of one side, deviating from the cavity, of the first lens is a light-out surface; the light-in surface and the light-out surface are refracting surfaces; when a light beam emitted by the light source is refracted to the projection sheet through the light incident surface, the reflecting surface and the light emergent surface and reaches an entrance pupil position of the imaging lens group, an imaging area of the light beam coincides with an entrance pupil area; the first direction is parallel to the optical axis of the first lens. The light beam energy utilization rate can be increased, and the brightness and definition of the projection pattern are improved.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a vehicle-mounted projection system and a vehicle. Background Art

[0002] Projection technology is widely used in image display, welcome lighting, stage lighting, and with the continuous advancement of technology, projection lamps are also used in the automotive field. Projection lamps are usually set outside the car body to create welcome, warning and other effects. At present, due to the unreasonable optical design of projection lamps, the brightness and clarity of the projection pattern are affected. Utility Model Content

[0003] Based on the above description, the present application provides a vehicle-mounted projection system and a vehicle to solve the problem of low quality of projection patterns of current automobile projection lamp systems.

[0004] In a first aspect, the present application provides a vehicle-mounted projection system, comprising: a light source, a first lens, a projection sheet, and an imaging lens group, which are sequentially arranged along a first direction and arranged on the same optical axis; the first lens is constructed as a rotating body, and the first lens has an opening and a cavity that passes through the opening; the light source is arranged toward the opening; the inner wall surface of the cavity of the first lens is a light incident surface, the circumferential surface of the first lens is a reflective surface, and a surface portion of a side of the first lens that is away from the cavity is a light emitting surface; the light incident surface and the light emitting surface are both refractive surfaces;

[0005] Wherein, when the light beam emitted by the light source is refracted to the slide through the light incident surface, the reflection surface and the light exit surface and reaches the entrance pupil position of the imaging lens group, the imaging area of ​​the light beam coincides with the entrance pupil area;

[0006] The first direction is parallel to the optical axis of the first lens.

[0007] In one or more embodiments, the light emitting surface includes a first surface and a second surface connected to each other; the projection of the second surface in the first direction is within the projection of the first surface in the first direction, and the optical focal length of the first surface is less than or equal to the optical focal length of the second surface.

[0008] In one or more embodiments, the first surface is a concave surface, and the second surface is a convex surface; or

[0009] The first surface is a concave surface, and the second surface is a flat surface; or

[0010] The first surface and the second surface are both concave surfaces.

[0011] In one or more embodiments, the size of the exit pupil region of the first lens in the second direction is greater than or equal to the size of the projection film in the second direction;

[0012] The second direction is perpendicular to the first direction.

[0013] In one or more embodiments, the system satisfies the following light distribution relationship: 0.5 ≤ h 0 u 0 / h 1 u 1 ≤ 1.2;

[0014] Wherein, h 0 represents the height of the light source above the optical axis of the first lens; h 1 represents the height of the entrance pupil position of the imaging lens group above the optical axis of the first lens; u 0 represents the angle formed by the connection line of the light beam from the light source to the exit pupil position of the first lens and the optical axis of the first lens; u 1 represents the angle formed by the connection line of the light beam from the exit pupil position of the first lens to the equivalent optical center of the imaging lens group and the optical axis of the first lens.

[0015] In one or more embodiments, 0.9 ≤ h 0 u 0 / h 1 u 1 ≤ 1.1.

[0016] In one or more embodiments, the reflecting surface includes a first reflecting surface disposed close to the light source and a second reflecting surface disposed close to the projection film; the first reflecting surface and the second reflecting surface are connected to each other;

[0017] Wherein, the first reflecting surface is a convex curved surface, the second reflecting surface is a plane, and in the first direction and the direction in which the projection film is away from the first lens, the distance from the second reflecting surface to the optical axis of the first lens in the second direction gradually decreases; the second direction is perpendicular to the first direction.

[0018] In one or more embodiments, the optical power of the incident light surface is greater than zero; and / or

[0019] The side wall surface and the bottom wall surface of the inner cavity of the first lens are both convex curved surfaces; wherein, the maximum dimension z 1 of the cavity of the first lens in the first direction, and the maximum dimension z 2 of the first lens in the first direction satisfy the following relationship: 0 < z 1 ≤ 0.67z 2 .

[0020] In one or more embodiments, the angle θ formed by the tangent line of the light-emitting surface at the near-end point with respect to the optical axis of the first lens and the optical axis 1 satisfies: 15° ≤ θ 1 ≤ 130°; and / or

[0021] The angle θ formed by the tangent line of the light-emitting surface at the far-end point with respect to the optical axis of the first lens and the optical axis 2 satisfies: 25° ≤ θ 2 ≤ 130°.

[0022] In a second aspect, the present application provides a vehicle, including the vehicle-mounted projection system described in any one of the above embodiments.

[0023] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0024] In the embodiment of the present application, a light source, a first lens, a slide, and an imaging lens group are arranged in sequence along a first direction and coaxially to form a vehicle-mounted projection system; the first lens is configured as a solid of revolution, and the first lens has an opening and a cavity communicating with the opening, that is, the first lens is a solid structure and is partially provided with a cavity; the light source is arranged towards the opening, that is, the light source emits divergent light beams towards the cavity, and the light beams are refracted from the inner wall surface of the cavity into the solid of the first lens, and after being reflected by the circumferential surface of the first lens, they are collimated and focused on the light-emitting surface, and are refracted by the light-emitting surface to the slide and reach the imaging lens group. By setting that when the light beam reaches the entrance pupil position of the imaging lens group, the imaging area of the light beam coincides with the entrance pupil area, the light beam can just fill the entrance pupil area of the imaging lens group, thereby increasing the light energy utilization rate and improving the brightness and clarity of the projection pattern. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of a vehicle-mounted projection system provided by an embodiment of the present application;

[0026] Figure 2 is Figure 1 a schematic structural diagram of the first lens in one embodiment of ;

[0027] Figure 3 is Figure 2 a cross-sectional schematic diagram of the first lens in ;

[0028] Figure 4 is Figure 1 a schematic diagram of the light beam irradiation of the illumination part of the vehicle-mounted projection system in ;

[0029] Figure 5 is a schematic diagram of a projection light spot in a related art;

[0030] Figure 6aSchematic diagram of the light intensity distribution of the projection spot under the first lens in an embodiment of the present application;

[0031] Figure 6b Schematic diagram of the light intensity distribution of the projection spot under the first lens in another embodiment of the present application;

[0032] Figure 7 is Figure 1 Schematic cross-sectional structure diagram of the first lens in another embodiment in

[0033] Figure 8 is Figure 1 Schematic cross-sectional structure diagram of the first lens in yet another embodiment in

[0034] Figure 9 is Figure 1 Schematic cross-sectional structure diagram of the first lens in still another embodiment in

[0035] Figure 10 is Figure 1 Schematic structure diagram of the vehicle-mounted projection system in

[0036] Figure 11 is Figure 2 Schematic structure diagram of the first lens in

[0037] Figure 12 Schematic structure diagram of the imaging lens group in an embodiment of the present application;

[0038] Figure 13 Schematic structure diagram of the imaging lens group in another embodiment of the present application.

[0039] Explanation of reference numerals:

[0040] Vehicle-mounted projection system 10;

[0041] Light source 11, aperture k, cavity q;

[0042] First lens 12;

[0043] Slide 13;

[0044] Imaging lens group 14, imaging lens 141;

[0045] Incident light surface s1, reflection surface s2, first reflection surface s21, second reflection surface s22, exit light surface s3, first surface s31, second surface s32;

[0046] Entrance pupil position t1, entrance pupil region r1, exit pupil position t2, exit pupil region r2;

[0047] First half height h 0 , second half height h 1 , first included angle u 0, the second included angle u 1 , the equivalent optical center p;

[0048] The first dimension z 1 , the second dimension z 2 ;

[0049] The first angle θ 1 , the first angle θ 2 ;

[0050] The optical axis L, the optical path e, the light beam w;

[0051] The first direction F1, the second direction F2. Detailed implementation mode

[0052] For the convenience of understanding this application, the following will describe this application more comprehensively with reference to the relevant drawings. Embodiments of this application are given in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] It can be understood that spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. can be used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the drawing is flipped, the element or feature described as "below other elements" or "beneath it" or "under it" will be oriented "above" other elements or features. Therefore, the exemplary terms "under" and "below" can include both the upper and lower orientations. In addition, the device can also include other orientations (such as rotating 90 degrees or other orientations), and the spatial description terms used herein are accordingly interpreted.

[0055] Traditional projection lamp systems mainly include LEDs, collimating lenses, projection sources, and imaging lens groups. The light emitted by the light source is collimated and then passes through the projection source and then through the imaging lens group, and finally a luminous projection effect with a specific pattern is obtained.

[0056] Experience shows that the lighting system accounts for the largest proportion of the total light energy loss of the vehicle-mounted projection lamp system, and the traditional projection lamp system has a large light loss and an energy utilization rate of about 33%. Therefore, the quality of the lighting system has a great impact on the final output brightness of the projection lamp, and even leads to a reduction in the clarity of the projection lamp. At the same time, it has a greater impact on the defects caused by the uniformity of the illumination of irregular patterns in the display field.

[0057] In some related technologies, the brightness at the image element is uneven, for example, the light in the center area is strong and the light in the edge area is weak, which makes the pattern on the projection surface uneven. In order to cooperate with the image element, a large number of lenses are usually used in the projection element. These lenses are used to project the entire image. They are large in size and the total length of the optical system is long, which makes the entire device large and long, and then it is difficult to adapt to the narrow installation space, and it is not conducive to assembling and manufacturing the device. In addition, the projection element equipped with the existing welcome lamp has weak control over light, so that if the light emitted by the lighting system is not collimated to a higher standard, it is easy to generate stray light, which also reduces the clarity of the projection pattern.

[0058] Based on this, the embodiments of the present application provide a vehicle-mounted projection system and a vehicle to solve the problem of low quality of projection patterns of current automobile projection lamp systems.

[0059] See also Figure 1 The embodiment of the present application provides a vehicle-mounted projection system 10, comprising a light source 11, a first lens 12, a projection film 13 and an imaging lens group 14 which are arranged in sequence along a first direction F1 and arranged on the same optical axis L; the first lens 12 is constructed as a rotating body, and the first lens 12 has an opening k and a cavity q that passes through the opening k; the light source 11 is arranged toward the opening k; the inner wall surface of the cavity q of the first lens 12 is a light incident surface s1, the circumferential surface of the first lens 12 is a reflection surface s2, and the surface of the first lens 12 on one side away from the cavity q is a light exiting surface s3; the light incident surface s1 and the light exiting surface s3 are both refractive surfaces; wherein, when a light beam emitted by the light source 11 is refracted to the projection film 13 through the light incident surface s1, the reflection surface s2 and the light exiting surface s3, and reaches the entrance pupil position t1 of the imaging lens group 14, the imaging area of ​​the light beam coincides with the entrance pupil area r1; the first direction F1 is parallel to the optical axis L of the first lens 12.

[0060] Specifically, the first lens 12 can be made of plastic or glass, such as plastic materials like PMMA, PC or T62R, or glass materials like H-K9L or H-ZK3. The first lens 12 is configured as a solid of revolution, and the first lens 12 has an opening k and a cavity q communicating with the opening k, that is, the first lens 12 is a solid structure with a cavity q partially formed therein; the light source 11 is arranged facing the opening k, that is, the light source 11 emits a light beam towards the cavity q. The light source 11 can be an LED light source. The projection film 13 can be a film. The projection film 13 and the first lens 12 can be in contact or adjacent, and can be adjusted according to actual needs. In this embodiment, the imaging lens group 14 can include multiple imaging lenses 141. The entrance pupil position t1 of the imaging lens group 14 can be on the left or right side of the first imaging lens 141 closest to the projection film 13, or can be located between subsequent imaging lenses 141, which can be determined according to the actual design of the imaging lens group 14. The entrance pupil region r1 refers to the region between two opposite entrance pupil positions t1 of the imaging lens group 14. As Figure 1 shown, the light path e just reaches two opposite entrance pupil positions t1, and the light beam emitted from the light exit surface s3 just fills the entrance pupil region r1, that is, the imaging region of the light beam coincides with the entrance pupil region r1. It should be noted that the entire surface of the first lens 12 facing away from the cavity q is the light exit surface s3, or a part of the surface of the first lens 12 facing away from the cavity q is the light exit surface s3, and the shape of the light exit surface s3 can be adjusted according to the shape of the projection film 13 so that the light beam emitted from the light exit surface s3 can irradiate all the projection information of the projection film 13.

[0061] In this embodiment, by setting the inner wall surface of the cavity q of the first lens 12 as the light entrance surface s1, the circumferential surface of the first lens 12 as the reflection surface s2, and the surface of the first lens 12 facing away from the cavity q as the light exit surface s3; both the light entrance surface s1 and the light exit surface s3 are refraction surfaces. The light beam refracts into the solid of the first lens 12 from the inner wall surface of the cavity q, is reflected by the circumferential surface of the first lens 12, is collimated and focused on the light exit surface s3, and is refracted by the light exit surface s3 to the projection film 13 and reaches the imaging lens group 14. When the light beam reaches the entrance pupil position t1 of the imaging lens group 14, the imaging region of the light beam coincides with the entrance pupil region r1, enabling the light beam to just fill the entrance pupil region r1 of the imaging lens group 14, increasing the utilization rate of the light beam energy, achieving a high match between the energy and the pattern information transmission, having an almost optimal contribution effect on imaging, and improving the brightness and clarity of the projected pattern.

[0062] Refer to Figure 2 and Figure 3 and in combination with Figure 1, in some embodiments, the optical power of the light incident surface s1 is greater than zero. It should be noted that when the optical power of a surface is greater than zero, it indicates that the surface is a convex surface; when the optical power of a surface is equal to zero, it indicates that the surface is a flat surface; when the optical power of a surface is less than zero, it indicates that the surface is a concave surface. In this embodiment, the optical power of the light incident surface s1 is greater than zero, indicating that the light incident surface s1 is a convex surface and has an aggregating effect on the incident light beam.

[0063] Further, both the side wall surface and the bottom wall surface of the inner cavity q of the first lens 12 are convex curved surfaces; wherein, the maximum dimension of the cavity q of the first lens 12 along the first direction F1 (i.e., the first dimension z 1 ), and the maximum dimension of the first lens 12 along the first direction F1 (i.e., the second dimension z 2 ) satisfy the following relationship: 0 < z 1 ≤0.67z 2 .

[0064] Specifically, the side wall surface of the cavity q of the first lens 12 is a rotationally symmetric free-form surface and is a convex surface, and the bottom wall surface is a free-form surface and is a convex surface. By defining 0 < z 1 ≤0.67z 2 , the depth of the cavity q can be reasonably set. It should be noted that as Figure 4 shown, the light beam w with a small incident angle emitted by the light source 11 is incident on the bottom wall surface of the cavity q, and based on the refraction law, the small-angle light beam w can be collimated and aggregated. The light beam w with a large incident angle emitted by the light source 11 is refracted by the side wall surface of the cavity q and enters the solid body of the first lens 12 and is emitted to the reflection surface s2, and based on the total reflection law, the large-angle light beam can be collimated and aggregated. In this way, the light beams w with large and small incident angles emitted by the light source 11 can all achieve reasonable light distribution and be collimated and aggregated to the light exit surface s3, thereby improving the utilization rate of the light beam energy and enhancing the brightness and clarity of the projected pattern.

[0065] Continuing to refer to Figure 2 and Figure 3 , in some embodiments, the light exit surface s3 includes a first surface s31 and a second surface s32 that are connected to each other; the projection of the second surface s32 in the first direction F1 is located within the projection of the first surface s31 in the first direction F1, and the optical power of the first surface s31 is less than or equal to the optical power of the second surface s32.

[0066] It should be noted that for the light exit surface s3, the smaller its optical power, the greater the aggregating effect on the emitted light beam, and the greater the optical power, the greater the diverging effect on the emitted light beam.

[0067] Specifically, in one embodiment, the optical power of the first surface s31 can be set to be less than that of the second surface s32. In this way, the first surface s31 has a stronger light condensing effect relative to the second surface s32, which helps to improve the problem of strong light in the middle and weak light at the edge of the projection light spot as shown in the related art Figure 5 to achieve a uniform light effect and improve the illumination uniformity of the projection pattern. Or, in another embodiment, the optical power of the first surface s31 is set to be equal to that of the second surface s32. At this time, the purpose of uniform light can be achieved by optimizing the optical power of the incident light surface s1 and the curvature of the reflecting surface s2.

[0068] In a specific embodiment, as Figure 3 shown, the first surface s31 is a concave surface, and the second surface s32 is a convex surface, that is, the optical power of the first surface s31 is less than zero, that is, the optical power of the second surface s32 is greater than zero. Specifically, continue to refer to Figure 4 , through the light condensing effect of the first surface s31 and the light scattering effect of the second surface s32, the light spot of the light beam w projected on the projection film 13 can be evenly distributed from the center to the outer edge, realizing the uniform light effect, as Figure 6a and Figure 6b shown. It should be noted that the shape of the light-emitting surface s3 can be circular or square, and is specifically adjusted according to the shape of the projection film 13. As Figure 7 shown, in another specific embodiment, the first surface s31 is a concave surface, and the second surface s32 is a plane, that is, the optical power of the first surface s31 is less than zero, and the optical power of the second surface s32 is equal to zero. In this way, the first surface s31 has a stronger light condensing effect relative to the second surface s32, which helps to improve the problem of strong light in the middle and weak light at the edge of the light spot and realize the uniform light effect.

[0069] In yet another specific embodiment, as Figure 8 shown, both the first surface s31 and the second surface s32 are concave surfaces, that is, the first surface s31 and the second surface s32 together form a complete concave surface, and the optical power is less than zero. At this time, the purpose of uniform light can be achieved by optimizing the optical power of the incident light surface s1 and the curvature of the reflecting surface s2. In other embodiments, as Figure 9 shown, both the first surface s31 and the second surface s32 are planes, and the light-emitting surface s3 is a complete plane. The purpose of uniform light can be achieved by optimizing the optical power of the incident light surface s1 and the curvature of the reflecting surface s2. Compared with the two embodiments shown in Figure 3 and Figure 7 , in this embodiment, the light-emitting surface s3 is processed into a complete concave surface or plane, which can reduce the weight of the first lens 12 and also save manufacturing costs.

[0070] Continue to refer to Figures 1 to 3, in some embodiments, the reflecting surface s2 includes a first reflecting surface s21 disposed near the light source 11 and a second reflecting surface s22 disposed near the slide 13; the first reflecting surface s21 and the second reflecting surface s22 are connected to each other; wherein, the first reflecting surface s21 is a convex curved surface, and the second reflecting surface s22 is a plane. Along the first direction F1 and in the direction away from the first lens 12 of the slide 13, the distance from the second reflecting surface s22 to the optical axis L of the first lens 12 gradually decreases along the second direction F2; the second direction F2 is perpendicular to the first direction F1.

[0071] Specifically, by setting the first reflecting surface s21 as a convex curved surface, a free surface with approximate elliptical rotational symmetry, the large-angle incident light beam can effectively achieve the function of collimation and focusing based on the total reflection law. In addition, by setting the second reflecting surface s22 as a plane, and along the first direction F1 and in the direction away from the first lens 12 of the slide 13, the distance from the second reflecting surface s22 to the optical axis L of the first lens 12 gradually decreases along the second direction F2, that is, the closer to the slide 13, the more inclined the second reflecting surface s22 is towards the optical axis L direction. In this way, a constraint effect is exerted on the light beam to avoid the light beam exiting outside the slide 13 and generating background stray light.

[0072] Refer to Figure 10 , in some embodiments, the size of the exit pupil region r2 of the first lens 12 along the second direction F2 is greater than or equal to the size of the slide 13 along the second direction F2; wherein, the second direction F2 is perpendicular to the first direction F1. It should be noted that the exit pupil region r2 of the first lens 12 refers to the region between the two exit pupil positions t2 opposite to the first lens 12. Specifically, the size of the exit pupil region r2 of the first lens 12 along the second direction F2 can be set to be slightly greater than or equal to the size of the slide 13 along the second direction F2. In this way, the slide 13 is fully illuminated, a complete projection pattern is projected, and at the same time, background stray light is minimized as much as possible to improve the clarity of the projection pattern.

[0073] Continue to refer to Figure 10 , in some embodiments, the vehicle-mounted projection system satisfies the following light distribution relationship: 0.5 ≤ h 0 u 0 / h 1 u 1 ≤ 1.2; wherein, h 0 represents the height of the light source 11 above the optical axis L of the first lens 12 (i.e., the first half-height h 0 ); h 1 represents the height of the entrance pupil position t1 of the imaging lens group 14 above the optical axis L of the first lens 12 (i.e., the second half-height h 1 ); u 0 represents the angle formed by the connection line of the light beam from the light source 11 to the exit pupil position t2 of the first lens 12 and the optical axis L of the first lens 12 (i.e., the first angle u0 ); u 1 represents the included angle between the line connecting the exit pupil position t2 of the first lens 12 and the equivalent optical center p of the imaging lens group 14 and the optical axis L of the first lens 12 (i.e., the second included angle u 1 ). Exemplarily, h can be set 0 u 0 / h 1 u 1 = 0.5, or h 0 u 0 / h 1 u 1 = 0.6, h 0 u 0 / h 1 u 1 = 0.7, h 0 u 0 / h 1 u 1 = 0.8, h 0 u 0 / h 1 u 1 = 0.9, h 0 u 0 / h 1 u 1 = 1, h 0 u 0 / h 1 u 1 = 1.1 or h 0 u 0 / h 1 u 1 = 1.2, which can be specifically set according to the actual situation. In this embodiment, u is generally set 0 to 60°, to avoid low irradiation energy due to too large an angle. In this way, the optical expansion amount of the illumination part in the vehicle-mounted projection system meets a high matching effect, with less energy loss, improving the brightness and clarity of the projected pattern.

[0074] Preferably, 0.9 ≤ h 0 u 0 / h 1 u 1 ≤ 1.1. Exemplarily, h 0 u 0 / h 1 u 1 = 0.9, or h 0 u 0 / h 1 u 1 = 1, or h 0 u 0 / h 1 u1 = 1.1. In summary, by setting h 0 u 0 ≈ h 1 u 1 , the optical expansion amount of the illumination part in the vehicle-mounted projection system can meet a higher matching effect, effectively reduce energy loss, and improve the illuminance of the projection pattern. In addition, in this embodiment, according to the above-mentioned light distribution relationship, the distance between each component in the vehicle-mounted projection system can be simulated and designed through optical design software to maximize the energy utilization rate.

[0075] Referring to Figure 11 , and in combination with Figure 3 , in some embodiments, the angle θ formed by the tangent line of the near-end point of the light-emitting surface s3 with respect to the optical axis L of the first lens 12 and the optical axis L 1 satisfies: 15° ≤ θ 1 ≤ 130°; Further, the angle θ formed by the tangent line of the far-end point of the light-emitting surface s3 with respect to the optical axis L of the first lens 12 and the optical axis L 2 satisfies: 25° ≤ θ 2 ≤ 130°.

[0076] Specifically, the angle θ formed by the tangent line of the near-end point of the light-emitting surface s3 with respect to the optical axis L of the first lens 12 and the optical axis L 1 can be set to 15°, 30°, 60°, 90°, 120° or 130°. In this way, the bending degree of the part of the second surface s32 of the light-emitting surface s3 close to the optical axis L can be flexibly set, and can be specifically set according to actual needs. The angle θ formed by the tangent line of the far-end point of the light-emitting surface s3 with respect to the optical axis L of the first lens 12 and the optical axis L 2 can be set to 25°, 30°, 60°, 90°, 120° or 130°. In this way, the bending degree of the part of the first surface s31 of the light-emitting surface s3 away from the optical axis L can be flexibly set, and can be specifically set according to actual needs.

[0077] In some embodiments, the imaging lens group 14 includes at least three imaging lenses 141. In a specific embodiment, as Figure 1 shown, the imaging lens group 14 includes three imaging lenses 141, and the three imaging lenses 141 can be spaced apart. In another specific embodiment, as Figure 12 shown, the imaging lens group 14 includes three imaging lenses 141, and two of the imaging lenses 141 are glued together. In still other embodiments, as Figure 13 shown, the imaging lens group 14 includes two sets of imaging lenses, and each set of imaging lenses includes two glued imaging lenses 141. In this way, the situation of the imaging lens group 14 can be flexibly set, and can be specifically considered and designed according to factors such as the field of view angle, resolution and cost.

[0078] Based on the same inventive concept, an embodiment of the present application further provides a vehicle, including the vehicle-mounted projection system 10 of any one of the above embodiments.

[0079] In summary, in the present application, the light beam is refracted from the inner wall surface of the cavity q into the entity of the first lens 12, reflected by the circumferential surface of the first lens 12, collimated and focused onto the light-emitting surface s3, refracted by the light-emitting surface s3 to the slide 13 and reaches the imaging lens group 14. When the light beam reaches the entrance pupil position t1 of the imaging lens group 14, the imaging area of the light beam coincides with the entrance pupil area r1, enabling the light beam to exactly fill the entrance pupil area r1 of the imaging lens group 14, increasing the light energy utilization rate, achieving a high match between the energy and the pattern information, having an almost optimal contribution effect on imaging, and improving the brightness and clarity of the projected pattern. Additionally, by setting the size of the exit pupil area r2 of the first lens 12 along the second direction F2 to be greater than or equal to the size of the slide 13 along the second direction F2, the slide 13 is fully illuminated, a complete projected pattern is projected, and at the same time, background stray light is minimized as much as possible, improving the clarity of the projected pattern. Furthermore, the optical étendue of the illumination part in the vehicle-mounted projection system meets a high matching effect, effectively reducing energy loss and increasing the illuminance of the projected pattern. By setting the first surface s31 of the light-emitting surface s3 to be a concave surface and its second surface s32 to be a convex surface or a flat surface, the first surface s31 has a stronger light-gathering effect relative to the second surface s32, which helps to improve the problem of strong light in the middle and weak light at the edges of the light spot, achieves a light homogenization effect, and improves the uniformity of the illuminance of the projected pattern.

[0080] Compared with the traditional projection system, under the same light source conditions, the energy utilization rate of the vehicle-mounted projection system according to the embodiment of the present application can reach 75%, the incident luminous flux is relatively high, the projected pattern is relatively clear, and compared with a microlens array, an integral lens, etc., the lens part in the vehicle-mounted projection system according to the embodiment of the present application is relatively easy to process and the cost is relatively low, having high attractiveness in the static projection lamp market.

[0081] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A vehicle-mounted projection system, characterized in that: include: A light source, a first lens, a projection sheet and an imaging lens group are sequentially arranged along a first direction and arranged on the same optical axis; The first lens is constructed as a rotating body, and the first lens has an opening and a cavity penetrating the opening; the light source is arranged toward the opening; the inner wall surface of the cavity of the first lens is a light incident surface, the circumferential surface of the first lens is a reflecting surface, and the surface portion of the first lens on one side away from the cavity is a light emitting surface; the light incident surface and the light emitting surface are both refractive surfaces; Wherein, when the light beam emitted by the light source is refracted to the slide through the light incident surface, the reflection surface and the light exit surface and reaches the entrance pupil position of the imaging lens group, the imaging area of ​​the light beam coincides with the entrance pupil area; The first direction is parallel to the optical axis of the first lens.

2. The vehicle-mounted projection system according to claim 1, characterized in that: The light emitting surface includes a first surface and a second surface connected to each other; a projection of the second surface in the first direction is located within a projection of the first surface in the first direction, and an optical focal length of the first surface is less than or equal to an optical focal length of the second surface.

3. The vehicle-mounted projection system according to claim 2, characterized in that: The first surface is a concave surface, and the second surface is a convex surface; or The first surface is a concave surface, and the second surface is a flat surface; or The first surface and the second surface are both concave surfaces.

4. The vehicle-mounted projection system according to claim 1, characterized in that: The size of the exit pupil area of ​​the first lens along the second direction is greater than or equal to the size of the projection film along the second direction; The second direction is perpendicular to the first direction.

5. The vehicle-mounted projection system according to any one of claims 1 to 4, characterized in that: The system satisfies the following light distribution relationship: 0.5≤h0u0 / h1u1≤1.2; Among them, h0 represents the height of the light source above the optical axis of the first lens; h1 represents the height of the entrance pupil position of the imaging lens group above the optical axis of the first lens; u0 represents the angle formed by the line connecting the light beam from the light source to the exit pupil position of the first lens and the optical axis of the first lens; u1 represents the angle formed by the line connecting the light beam from the exit pupil position of the first lens to the equivalent optical center of the imaging lens group and the optical axis of the first lens.

6. The vehicle-mounted projection system according to claim 5, characterized in that: 0.9≤h0u0 / h1u1≤1.

1.

7. The vehicle-mounted projection system according to any one of claims 1 to 4, characterized in that: The reflecting surface comprises a first reflecting surface arranged close to the light source and a second reflecting surface arranged close to the slide; the first reflecting surface and the second reflecting surface are connected to each other; Among them, the first reflecting surface is a convex surface, the second reflecting surface is a plane, and along the first direction and in the direction where the slide is away from the first lens, the distance from the second reflecting surface to the optical axis of the first lens along the second direction gradually decreases; the second direction is perpendicular to the first direction.

8. The vehicle-mounted projection system according to any one of claims 1 to 4, characterized in that: The optical focal length of the light incident surface is greater than zero; and / or The side wall surface and the bottom wall surface of the cavity in the first lens are both convex surfaces; wherein the maximum dimension z1 of the cavity of the first lens along the first direction and the maximum dimension z2 of the first lens along the first direction satisfy the following relationship: <z1≤0.67z2。 9. The vehicle-mounted projection system according to any one of claims 1 to 4, characterized in that: An angle θ1 formed by a tangent line of a proximal end point of the light emitting surface relative to the optical axis of the first lens and the optical axis satisfies: 15°≤θ1≤130°; and / or An angle θ2 formed between a tangent line of a far end point of the light emitting surface relative to the optical axis of the first lens and the optical axis satisfies: 25°≤θ2≤130°.

10. A vehicle, characterized in that: The vehicle-mounted projection system comprises the vehicle-mounted projection system as described in any one of claims 1 to 9.

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