Vehicle-mounted projection optical lens, vehicle-mounted projection optical system, and vehicle-mounted projection equipment

Abstract

The present invention discloses a vehicle-mounted projection optical lens, a vehicle-mounted projection optical system and a vehicle-mounted projection device, wherein the vehicle-mounted projection optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from a projection surface to a light source in the direction of an optical axis; the optical power of the first lens is φ1, then -0.042<φ1<-0.041; the optical power of the second lens is φ2, then -0.034<φ2<-0.033; the optical power of the third lens is If the focal power is φ3, then 0.051<φ3<0.052; if the focal power of the fourth lens is φ4, then -0.075<φ4<-0.074; if the focal power of the fifth lens is φ5, then 0.024<φ5<0.025; if the focal power of the sixth lens is φ6, then 0.025<φ6<0.026; if the focal power of the seventh lens is φ7, then 0.052<φ7<0.053; so that the total optical length TTL of the vehicle-mounted projection optical lens is ≤43.078 mm. The projection optical lens and system provided by the present invention have the advantage of being compact.

Description

Technical Field

[0001] The present invention relates to the technical field of optical systems, and in particular to a vehicle-mounted projection optical lens, a vehicle-mounted projection optical system and a vehicle-mounted projection device. Background Art

[0002] In recent years, with the rapid development of smart electric vehicles, various intelligent applications in vehicles have become more and more widespread. Existing in-vehicle projection display systems, such as the intelligent recognition of patterns projected by the projection system in the trunk, car search or trunk opening and closing operations, and the installation of welcome lights in the car doors, have put forward higher requirements on the volume of the projection optical system due to the limitation of installation space. Summary of the Invention

[0003] The main purpose of the present invention is to provide a vehicle-mounted projection optical lens, a vehicle-mounted projection optical system and a vehicle-mounted projection device, so that they have the advantage of being small in size.

[0004] To achieve the above-mentioned object, the present invention provides a vehicle-mounted projection optical lens, wherein the vehicle-mounted projection optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in sequence from a projection surface to a light source in the optical axis direction;

[0005] The optical power of the first lens is but

[0006] The optical power of the second lens is but

[0007] The optical power of the third lens is but

[0008] The optical power of the fourth lens is but

[0009] The optical power of the fifth lens is but

[0010] The optical power of the sixth lens is but

[0011] The optical power of the seventh lens is but

[0012] So that the total optical length TTL of the vehicle-mounted projection optical lens is ≤43.078 mm;

[0013] Wherein, the aperture value of the vehicle-mounted projection optical lens is F, F≥1.7;

[0014] The optical lens further includes a stop, and the stop is located between the third lens and the fourth lens.

[0015] Optionally, at least one of the materials of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens comprises glass, and the softening point temperature of the seventh lens is lower than the softening point temperatures of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens; and / or,

[0016] The material of the first lens includes plastic material.

[0017] Optionally, the first lens is an aspheric lens with negative optical power;

[0018] The second lens is a spherical lens with negative optical power;

[0019] The third lens is a spherical lens with positive optical power;

[0020] The fourth lens is a spherical lens with negative optical power;

[0021] The fifth lens is a spherical lens with positive optical power;

[0022] The sixth lens is a spherical lens with positive optical power;

[0023] The seventh lens is an aspherical lens and has positive optical power.

[0024] The present invention also proposes a vehicle-mounted projection optical system, wherein the vehicle-mounted projection optical system includes a vehicle-mounted projection optical lens and a display unit, wherein the vehicle-mounted projection optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the projection surface to the light source in the optical axis direction; the optical focal length of the first lens is but The optical power of the second lens is but The optical power of the third lens is but The optical power of the fourth lens is but The optical power of the fifth lens is but The optical power of the sixth lens is but The optical power of the seventh lens is but So that the total optical length TTL of the vehicle-mounted projection optical lens is ≤43.078 mm; the display unit is arranged on the side of the seventh lens facing away from the sixth lens to serve as the light source of the projection optical lens.

[0025] Optionally, the display unit includes a light-emitting chip and a prism which are sequentially arranged toward the seventh lens.

[0026] Optionally, the display unit further includes a galvanometer located on a side of the prism facing away from the light-emitting chip.

[0027] Optionally, the total optical length TTL of the vehicle-mounted projection optical system is ≤68.201 mm.

[0028] The present invention also provides a vehicle-mounted projection device, wherein the vehicle-mounted projection device includes the vehicle-mounted projection optical system, the vehicle-mounted projection optical system includes a vehicle-mounted projection optical lens and a display unit, the vehicle-mounted projection optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the projection surface to the light source in the optical axis direction; the optical focal length of the first lens is but The optical power of the second lens is but The optical power of the third lens is but The optical power of the fourth lens is but The optical power of the fifth lens is but The optical power of the sixth lens is but The optical power of the seventh lens is but So that the total optical length TTL of the vehicle-mounted projection optical lens is ≤43.078 mm; the display unit is arranged on the side of the seventh lens facing away from the sixth lens to serve as the light source of the projection optical lens.

[0029] In the technical solution of the present invention, by limiting the optical power values ​​of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens, the total optical length TTL of the optical lens is guaranteed to be ≤43.078 mm after the debugging and assembly of each lens is completed, thereby achieving a smaller volume effect compared to the prior art and adapting to the vehicle installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of an embodiment of a vehicle-mounted projection optical system provided by the present invention;

[0032] Figure 2 for Figure 1 Frequency MTF diagram of the vehicle-mounted projection optical system;

[0033] Figure 3 for Figure 1 Schematic diagram of the through-focus MTF of the vehicle-mounted projection optical system.

[0034] Description of Figure Numbers:

[0035] Label name Label name 1000 Vehicle-mounted projection optical system 6 Sixth lens 100 Car projection optical lens 7 Seventh lens 1 First lens 8 aperture 2 Second lens 9 Galvanometer 3 The third lens 10 Prism 4 Fourth lens 11 Protective glass 5 Fifth lens 12 Light-emitting chip

[0036] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] In recent years, with the rapid development of smart electric vehicles, various intelligent applications in vehicles have become more and more widespread. Existing in-vehicle projection display systems, such as the intelligent recognition of patterns projected by the projection system in the trunk, car search or trunk opening and closing operations, and the installation of welcome lights in the car doors, have put forward higher requirements on the volume of the projection optical system due to the limitation of installation space.

[0041] In view of this, the present invention provides a projection optical lens, Figure 1 An embodiment of the projection optical lens provided by the present invention will be described below with reference to specific drawings.

[0042] See also Figure 1 The vehicle-mounted projection optical lens 100 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7 which are arranged in sequence from the projection surface to the light source in the optical axis direction; the optical focal length of the first lens 1 is but The optical power of the second lens 2 is but The optical power of the third lens 3 is but The optical power of the fourth lens 4 is but The optical power of the fifth lens 5 is but The optical power of the sixth lens 6 is but The optical power of the seventh lens 7 is but So that the total optical length TTL of the vehicle-mounted projection optical lens 100 is ≤43.078 mm.

[0043] In the technical solution of the present invention, by limiting the optical power values ​​of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7, after the lenses are debugged and assembled, the total optical length TTL of the optical lens is guaranteed to be ≤43.078 mm, thereby achieving a smaller volume than the existing technology and adapting to the vehicle installation space.

[0044] Furthermore, the aperture value of the vehicle-mounted projection optical lens 100 is F, where F≥1.7. Based on the above-mentioned lens focal length setting value, while the vehicle-mounted projection optical lens 100 has a relatively small total optical length of 43.078 mm, it can support a relatively large aperture value of F / 1.7, thereby improving the optical performance of the vehicle-mounted projection optical lens 100.

[0045] In addition, at least one of the materials of the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 includes glass, and the softening point temperature of the seventh lens 7 is lower than the softening point temperature of the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6; and / or the material of the first lens 1 includes plastic. Specifically, in this embodiment, the materials of the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all set to glass, and the softening point temperature of the seventh lens 7 is lower than the softening point temperature of the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6, and the first lens 1 is set to plastic. The present invention utilizes a plastic lens and a glass lens with a lower softening point, enabling the hybrid use of glass and plastic lenses. By rationally allocating lens power, this approach simultaneously meets the requirements of high resolution and high brightness while ensuring low cost. Furthermore, the lens defocusing can be balanced at high temperatures, thereby preventing defocus at high temperatures. Specifically, to achieve this, the seventh lens 7 could actually be a plastic lens. However, because the seventh lens 7 is located near the light source and is subject to significant heat, the thermal expansion of the plastic lens would result in significant defocusing, impacting optical performance. Therefore, in this embodiment, a glass lens with a lower softening point is employed, which not only avoids this problem but also makes it easier to process than other glass lenses, ensuring low cost.

[0046] In addition, the first lens 1 is an aspheric lens with negative optical power; and / or the second lens 2 is a spherical lens with negative optical power; and / or the third lens 3 is a spherical lens with positive optical power; and / or the fourth lens 4 is a spherical lens with negative optical power; and / or the fifth lens 5 is a spherical lens with positive optical power; and / or the sixth lens 6 is a spherical lens with positive optical power; and / or the seventh lens 7 is an aspheric lens with positive optical power. Specifically, in this embodiment, the first lens 1 and the seventh lens 7 are configured as aspheric lenses, which can quickly eliminate various aberrations of the optical system, reduce the number of optical components, optimize the optical system, and reduce the size and weight of the system. At the same time, this embodiment optimizes the design parameters and dimensions of the projection system, reasonably distributes the optical power of each lens, and ensures a reasonable distribution of the deflection angle of light on each lens. While using fewer aspheric surfaces, it achieves optimal imaging effects while ensuring good processability and meeting the requirements of mass production. Since the manufacturing cost of aspherical lenses is higher than that of spherical lenses, in combination with the above, the first lens 1 is made of plastic material and the seventh lens 7 is made of low-softening glass material to meet lower manufacturing costs.

[0047] Furthermore, the fourth lens 4 and the fifth lens 5 are cemented together to form a cemented lens, which helps eliminate chromatic aberration. It is understood that chromatic aberration occurs when light passes through a lens, blurring the image. Therefore, chromatic aberration is a serious flaw in lens imaging. A cemented lens is a lens that is made by cementing multiple lenses together. When light is refracted through one lens of the cemented lens, chromatic aberration is generated. However, when the refracted light continues to pass through the other lens, the resulting chromatic aberration is exactly the opposite, offsetting the previously generated chromatic aberration and thus eliminating chromatic aberration.

[0048] Specifically, the gluing connection between the fourth lens 4 and the fifth lens 5 is achieved by optical glue, which has high light transmittance and helps to improve the imaging effect of the projected light.

[0049] Specifically, the optical lens further includes an aperture 8, which is located between the third lens 3 and the fourth lens 4. The aperture 8 is used to limit the size of the imaging range, and can be the edge of the lens, the lens frame, or a specially configured perforated screen, etc., which is not limited here.

[0050] See also Figure 1The present invention further provides a vehicle-mounted projection optical system 1000, comprising a vehicle-mounted projection optical lens 100 and a display unit. The specific structure of the vehicle-mounted projection optical lens 100 is described with reference to the aforementioned embodiments. Because the vehicle-mounted projection optical system 1000 utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects brought about by the technical solutions of the aforementioned embodiments, which will not be further detailed here. The display unit is disposed on the side of the seventh lens 7 facing away from the sixth lens 6 to serve as the light source for the projection optical lens.

[0051] Specifically, the display unit includes a light-emitting chip 12 and a prism 10, which are sequentially arranged toward the seventh lens 7. The light-emitting chip 12 emits light, serving as a light source, which projects an image onto a fixed location through the projection optical lens to form a projection surface, thereby achieving clear imaging and meeting consumer needs. The prism 10 is primarily used to adjust the optical path of the light to shape the image to meet projection requirements.

[0052] Furthermore, the display unit further includes a galvanometer 9 located on the side of the prism 10 facing away from the light-emitting chip 12. The galvanometer 9 is provided to enhance the image quality of the vehicle-mounted projection optical system 1000. For example, the image quality of the image passing through the galvanometer 9 can be increased from 1080p to 2K to improve the projection effect.

[0053] Furthermore, the vehicle-mounted projection optical system 1000 has a total optical length (TTL) of 68.201 mm or less. Based on the aforementioned smaller total optical length of the vehicle-mounted projection optical lens 100, after adding the display unit to form the vehicle-mounted projection optical system 1000, the vehicle-mounted projection optical system 1000 can have a total optical length (TTL) of 68.201 mm or less, thereby achieving a smaller size, meeting a smaller installation space, and extending its use.

[0054] It should be noted that the surface shapes of the first lens 1 and the seventh lens 7, which are arranged as aspherical surfaces, should satisfy the following equations:

[0055]

[0056] Where c is the curvature corresponding to the radius; y is the radial coordinate (its units are the same as the lens length); k is the conic coefficient, and a1, a2, a3, a4, a5, a6, a7, and a8 are the coefficients corresponding to the radial coordinates. These parameters can be used to set the shape and dimensions of the lens's aspheric surface facing the projection plane and light source.

[0057] Among them, when k is less than -1, the corresponding surface curve of the lens is a hyperbola; when k is equal to -1, the corresponding surface curve of the lens is a parabola; when -1 is less than k and less than 0, the corresponding surface curve of the lens is an ellipse; when k is equal to 0, the corresponding surface curve of the lens is a circle; when k is greater than 0, the corresponding surface curve of the lens is an oblate circle.

[0058] The following description takes the vehicle-mounted projection optical system 1000 with an aperture number of F / 1.7, a use distance of 0.77 m, and a magnification of 82.5 times as an example.

[0059] From the projection surface to the light source, the thickness of each lens, the radius of each surface, etc. are shown in Table 1 below:

[0060] Table 1

[0061]

[0062]

[0063] The conic coefficients and aspheric coefficients corresponding to the two aspheric surfaces S1 and S2 of the first lens 1 and the two aspheric surfaces S13 and S14 of the seventh lens 7 are shown in Table 2 below:

[0064] Table 2

[0065]

[0066] Please refer to Figure 2 and Figure 3 , the optical performance of the system can be evaluated based on the frequency MTF curve and the defocus MTF curve.

[0067] The present invention further provides an in-vehicle projection device, comprising the in-vehicle projection optical system 1000. The specific structure of the in-vehicle projection optical system 1000 is similar to that of the above-described embodiments. Because the in-vehicle projection device utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the above-described embodiments, and therefore, a detailed description thereof will not be repeated here.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present description and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A vehicle-mounted projection optical lens, characterized in that: The lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are arranged in sequence from the projection surface to the light source in the optical axis direction; The optical power of the first lens is but The optical power of the second lens is but The optical power of the third lens is but The optical power of the fourth lens is but The optical power of the fifth lens is but The optical power of the sixth lens is but The optical power of the seventh lens is but So that the total optical length TTL of the vehicle-mounted projection optical lens is ≤43.078 mm; Wherein, the aperture value of the vehicle-mounted projection optical lens is F, F≥1.7; The optical lens further includes a stop, and the stop is located between the third lens and the fourth lens.

2. The vehicle-mounted projection optical lens according to claim 1, wherein: At least one of the materials of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens comprises glass, and the softening point temperature of the seventh lens is lower than the softening points of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens; and / or The material of the first lens includes plastic material.

3. The vehicle-mounted projection optical lens according to claim 1, wherein: The first lens is an aspheric lens with negative optical power; The second lens is a spherical lens with negative optical power; The third lens is a spherical lens with positive optical power; The fourth lens is a spherical lens with negative optical power; The fifth lens is a spherical lens with positive optical power; The sixth lens is a spherical lens with positive optical power; The seventh lens is an aspherical lens and has positive optical power.

4. A vehicle-mounted projection optical system, characterized in that: include: A vehicle-mounted projection optical lens, comprising the vehicle-mounted projection optical lens according to any one of claims 1 to 3; as well as, The display unit is arranged on a side of the seventh lens facing away from the sixth lens to serve as a light source of the projection optical lens.

5. The vehicle-mounted projection optical system according to claim 4, wherein: The display unit includes a light emitting chip and a prism sequentially arranged toward the seventh lens.

6. The vehicle-mounted projection optical system according to claim 5, wherein: The display unit further includes a galvanometer located on a side of the prism facing away from the light-emitting chip.

7. The vehicle-mounted projection optical system according to claim 4, wherein: The total optical length TTL of the vehicle-mounted projection optical system is ≤68.201 mm.

8. A vehicle-mounted projection device, characterized in that: The vehicle-mounted projection device includes the vehicle-mounted projection optical system according to any one of claims 4 to 7.

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