Lens, display device, electronic apparatus, and vehicle

Abstract

The embodiment of the invention provides a lens, a display device, electronic equipment and a vehicle. The lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged from an image side to an object side. The first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from the image side to the object side, the first lens is closest to the image side, and the fourth lens is closest to the diaphragm. The second lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from the image side to the object side, and the fifth lens is closest to the diaphragm. Along the direction from the image side to the object side, one of the two adjacent lenses in the first lens group has positive focal power, and the other lens has negative focal power. According to the lens, the display device, the electronic equipment and the vehicle provided by the invention, distortion can be reduced, the imaging quality can be improved, and the low-distortion projection requirement can be met.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical technology, and in particular to a lens, a display device, an electronic device, and a vehicle. Background Art

[0002] With the development of smart car technology, augmented display head-up display (AR-HUD) has gradually become the mainstream configuration of smart car cockpits. Through the augmented display head-up display, the image to be displayed can be integrated with the real-time road surface, so that the driver can see the speed, navigation, signal lights and other information of the car while looking at the road, so there is no need to look down at the instrument panel or central control display under the steering wheel, which can greatly improve the braking reaction time in an emergency and improve driving safety.

[0003] In related technologies, the vehicle-mounted head-up display includes a projection optical engine and a projection lens. The projection optical engine modulates the navigation, instrument and other information to be displayed into a light beam and projects it toward the projection lens. The projection lens projects the image beam onto the projection surface, so that the real-time road surface is integrated with the information to be displayed.

[0004] However, existing projection lenses have the problem of high distortion. Summary of the invention

[0005] The embodiments of the present application provide a lens, a display device, an electronic device, and a vehicle, which can reduce lens distortion and improve imaging quality.

[0006] According to a first aspect of the present application, a lens is provided, which includes a first lens group, an aperture, and a second lens group arranged in sequence from the image side to the object side; the first lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the image side to the object side, the first lens is closest to the image side, and the fourth lens is closest to the aperture; the second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged in sequence from the image side to the object side, the fifth lens is closest to the aperture; along the direction from the image side to the object side, one of the two adjacent lenses in the first lens group has a positive optical focal length, and the other lens has a negative optical focal length.

[0007] The lens provided in the embodiment of the present application uses an aperture and nine lenses to form a four-in-front-five-in-rear structure, and combined with the different focal lengths of two adjacent lenses in the first lens group along the direction from the image side to the object side, can reduce the distortion of the lens, meet the projection requirements of low distortion, and improve the image quality. In addition, it can also meet the requirements of improving the imaging capability of the lens and meeting the projection requirements of high definition. In addition, it can also meet the projection requirements of high reliability.

[0008] In a possible implementation, the first lens has positive optical power.

[0009] The lens provided in the embodiment of the present application uses a first lens with positive optical power to converge the light passing through the second lens, which can not only reduce the size of the second lens, but also further reduce distortion. In addition, the reliability of the lens and the clarity of imaging can be further improved.

[0010] In a possible implementation, one of the fourth lens and the fifth lens has positive optical power, and the other lens has negative optical power.

[0011] The fourth lens and the fifth lens in the lens provided in the embodiment of the present application have different optical focal powers, which can not only reduce the size of the lens with negative optical focal power in the two lenses, but also increase the amount of light passing through the aperture, thereby further reducing distortion and improving reliability and clarity.

[0012] In a possible implementation, the fifth lens has positive optical power.

[0013] The fifth lens element in the lens provided in the embodiment of the present application has positive focal power, which can converge light and increase the amount of light entering the aperture, thereby helping to further reduce distortion and improve reliability and clarity.

[0014] In a possible implementation, along the direction from the image side to the object side, one of the two lenses in the second lens group closest to the aperture stop has positive optical power, and the other lens has negative optical power.

[0015] The fifth lens and the sixth lens in the lens provided in the embodiment of the present application have different optical focal powers, which can further reduce the distortion of the lens and further improve the clarity of the imaging and / or the reliability of the lens.

[0016] In a possible implementation manner, at least two of the remaining lenses in the second lens group have positive optical power.

[0017] At least two of the remaining lenses in the second lens group of the lens provided in the embodiment of the present application have positive optical power, which can converge light and increase the amount of light entering the lens, which helps to further reduce distortion and improve reliability and clarity.

[0018] In a possible implementation, along the direction from the image side to the object side, one of the two lenses that is closest to the object side and the lens that is closest to the aperture stop among the remaining lenses has positive optical power, and the other lens has negative optical power.

[0019] In the second lens group of the lens provided in the embodiment of the present application, one of the two lenses closest to the object side and the lens closest to the aperture among the remaining lenses has positive focal power and the other lens has negative focal power, which can further reduce distortion and improve reliability and clarity.

[0020] In a possible implementation, the remaining lenses in the second lens group have positive optical power.

[0021] The remaining lenses in the second lens group of the lens provided in the embodiment of the present application have positive optical power, which can converge light, not only reducing the size of two lenses in the second lens group, but also increasing the amount of light entering the two lenses, thereby helping to further reduce distortion and improve reliability and clarity.

[0022] In a possible implementation, along the direction from the image side to the object side, the lens closest to the object side in the second lens group has positive refractive power.

[0023] The lens closest to the object side in the second lens group of the lens provided in the embodiment of the present application has positive optical power, which can increase the amount of light entering the lens, thereby helping to further reduce distortion and improve reliability and clarity.

[0024] In a possible implementation, the first lens satisfies the relationship: 4.4<<f1 / f<<5.5; wherein f1 is the focal length of the first lens, and f is the focal length of the lens.

[0025] In a possible implementation manner, the first lens satisfies the relationship: 58mm<<f1<<72.5mm.

[0026] In a possible implementation, the first lens satisfies the relationship: 4.2<<r1 / f<<5.2; wherein r1 is the radius of curvature of the image side surface of the first lens.

[0027] In a possible implementation manner, the first lens satisfies the relationship: 55mm<<r1<<68.3mm.

[0028] In a possible implementation manner, the third lens satisfies the relationship: 2<<f3 / f<<2.5; wherein f3 is the focal length of the third lens.

[0029] In a possible implementation manner, the third lens satisfies the relationship: 26.35mm<<f3<<32.93mm.

[0030] In a possible implementation manner, the fifth lens satisfies the relationship: 1.7<<f5 / f<<2.1; wherein f5 is the focal length of the fifth lens.

[0031] In a possible implementation manner, the fifth lens satisfies the relationship: 22.39 mm<<f5<<27.67 mm.

[0032] In a possible implementation manner, the ninth lens satisfies the relationship: 2.8<<f9 / f<<3.2; wherein f9 is the focal length of the ninth lens.

[0033] In a possible implementation manner, the ninth lens satisfies the relationship: 36.88mm<<f9<<42.2mm.

[0034] In a possible implementation, the ninth lens satisfies the relationship: 2<<r9 / f<<2.55; wherein r9 is the radius of curvature of the image side surface of the ninth lens.

[0035] In a possible implementation manner, the ninth lens satisfies the relationship: 27mm<<r9<<34mm.

[0036] The lens provided in the embodiment of the present application can further reduce distortion, improve reliability and clarity, and improve imaging quality by limiting the focal length of at least one of the first lens, the third lens, the fifth lens, and the ninth lens and / or the ratio of the focal length of at least one lens to the focal length of the lens, and / or limiting the ratio of the radius of curvature of the image side surface of at least one of the first lens and the ninth lens to the focal length of the lens and / or the radius of curvature of the image side surface of at least one lens.

[0037] In a possible implementation, each of the lenses is a spherical lens.

[0038] Each lens in the lens provided in the embodiment of the present application is a spherical lens, which can not only reduce the manufacturing difficulty of the lens but also improve the imaging quality.

[0039] In a possible implementation, each of the lenses is a glass lens.

[0040] Each of the lenses in the lens provided in the embodiment of the present application is a glass lens, which can improve the reliability of the lens and ensure the imaging quality.

[0041] A second aspect of the present application provides a display device, comprising a projection optical machine and a lens as described in any one of the first aspects, wherein the lens is arranged on a light emitting side of the projection optical machine.

[0042] The display device provided in the embodiment of the present application can meet the projection requirements of low distortion, high reliability and high definition by adopting the lens in the first aspect.

[0043] A third aspect of the present application provides an electronic device, which includes the display device as described in the second aspect.

[0044] A fourth aspect of the present application provides a vehicle, which includes the display device as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0046] Figure 2 A spherical chromatic aberration diagram of the lens provided in this embodiment;

[0047] Figure 3 A diagram of astigmatism field curvature of the lens provided in this embodiment;

[0048] Figure 4 A distortion diagram of the lens provided in this embodiment;

[0049] Figure 5 A defocus curve diagram of the lens provided in this embodiment;

[0050] Figure 6 A relative illumination diagram of the lens provided in this embodiment.

[0051] Description of reference numerals:

[0052] 100. Display device;

[0053] 110. Lens;

[0054] 111, first lens group; 10, first lens; 20, second lens; 30, third lens; 40, fourth lens;

[0055] 112. Aperture;

[0056] 113, second lens group; 50, fifth lens; 60, sixth lens; 70, seventh lens; 80, eighth lens; 90, ninth lens;

[0057] 120. Projection light machine;

[0058] 130. Glass cover. DETAILED DESCRIPTION

[0059] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0060] To facilitate understanding, the relevant technical terms involved in the embodiments of the present application are first explained and illustrated.

[0061] Focal length, also known as focal length, is a measure of the concentration or dispersion of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane when an infinitely distant scene forms a clear image on the focal plane through a lens or lens group.

[0062] The image side, with the lens as the boundary, the side where the image is located is the image side, and the side of the lens facing the image side is the image side of the lens.

[0063] The object side is the side where the image source is located, and the side of the lens facing the object side is the object side. The image source is used to emit light to form an image.

[0064] Optical power represents the ability of a lens to refract an incident parallel light beam.

[0065] Positive power means that the lens has a positive focal length and has the effect of converging light.

[0066] Negative optical power means that the lens has a negative focal length and has the effect of diverging light.

[0067] Axial chromatic aberration, also known as longitudinal chromatic aberration or position chromatic aberration, is a beam of light parallel to the optical axis that converges at different positions before and after passing through the lens. This aberration is called position chromatic aberration or axial chromatic aberration. This is because the positions of the images of different wavelengths of light are different, so that the imaging planes of the images of different colors of light cannot completely overlap when the final image is formed, and the complex light spreads out to form dispersion.

[0068] Distortion, also known as distortion, is the degree of distortion of the image formed by the optical system relative to the object itself. Distortion is due to the influence of aperture aberration. The height of the intersection of the main light of different fields of view with the Gaussian image plane after passing through the optical system is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the imaging position of the off-axis object point on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0069] The augmented reality (AR) head-up display (AR-HUD) proposed in recent years can integrate the AR effect of the HUD projection display with the real road information, enhance the driver's acquisition of road information, and realize AR navigation, AR warning and other functions. In the related technology, the enhanced display head-up display includes a projection optical machine and a projection lens. The projection optical machine emits the navigation, instrument and other information to be displayed, modulated into a light beam and directed to the projection lens. The projection lens projects the image beam onto the projection surface, so that the real-time road surface is integrated with the information to be displayed. However, the existing projection lenses have problems such as high distortion, low clarity, and low reliability, resulting in poor imaging quality and unable to meet the projection requirements of high definition, low distortion, and high reliability.

[0070] In view of this, the embodiment of the present application provides a lens 110, a display device 100, an electronic device and a vehicle. When imaging through the lens 110, distortion can be reduced and clarity can be improved, thereby improving the imaging quality, thereby meeting the projection requirements of high definition and low distortion. In addition, the lens 110 has high reliability and can meet the projection hardware requirements of high reliability.

[0071] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Figure 1 As shown, the display device 100 provided in the embodiment of the present application includes a projection optical engine 120 and a lens 110, wherein the lens 110 is disposed on the light emitting side of the projection optical engine 120. The projection optical engine 120 is used to emit a light beam containing information to be displayed toward the lens 110.

[0072] The display device 100 provided in the embodiment of the present application may include but is not limited to electronic devices such as a display, a television, and a head-up display. In the embodiment of the present application, a head-up display is used as the display device 100 for illustration.

[0073] The display device 100 provided in the embodiment of the present application may also be applied to transportation vehicles, which may include but are not limited to cars, ships, airplanes, or trains.

[0074] In the embodiment of the present application, the structure of the projection optical machine 120 is not limited here. Figure 1 As shown, the projection light engine 120 is disposed on the object side, and the light emitted by the projection light engine 120 is projected toward the image side through the lens 110 .

[0075] In some possible implementations, such as Figure 1 As shown, the display device 100 may further include a glass cover plate 130 . The glass cover plate 130 is disposed between the lens 110 and the optical projection engine 120 along the direction from the image side to the object side. The glass cover plate 130 may protect the optical projection engine 120 .

[0076] The lens 110 provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0077] See also Figure 1 As shown, the lens 110 of the embodiment of the present application includes a first lens group 111, an aperture 112, and a second lens group 113 arranged in sequence from the image side to the object side. The first lens group 111 includes a first lens 10, a second lens 20, a third lens 30, and a fourth lens 40 arranged in sequence from the image side to the object side, the first lens 10 is closest to the image side, and the fourth lens 40 is closest to the aperture 112. The second lens group 113 includes a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, and a ninth lens 90 arranged in sequence from the image side to the object side, and the fifth lens 50 is closest to the aperture 112. Along the direction from the image side to the object side, one of the two adjacent lenses in the first lens group 111 has a positive focal power, and the other lens has a negative focal power.

[0078] In the embodiment of the present application, the aperture 112 is arranged between the fourth lens 40 and the fifth lens 50, so that the aperture 112 and the nine lenses form a front-four-back-five structure, where the front refers to the side of the aperture 112 facing the image side, and the back refers to the side of the aperture 112 facing the object side.

[0079] The lens 110 provided in the embodiment of the present application adopts a front four and rear five structure and combines the fact that one of the two adjacent lenses in the first lens group 111 has a positive focal length and the other has a negative focal length, which can not only reduce distortion and thus improve imaging quality, but also improve the reliability of the lens 110 and the clarity of imaging. Therefore, the lens 110 provided in the embodiment of the present application can meet the projection requirements of high definition, low distortion, and high reliability.

[0080] In the embodiment of the present application, the second lens group 113 includes five lenses, but the total number of lenses in the second lens group 113 may not be limited to five. For example, in one embodiment, the second lens group 113 may include seven lenses. In this case, the seven lenses may include a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, a ninth lens 90, a tenth lens and an eleventh lens arranged in sequence from the image side to the object side.

[0081] In the embodiment of the present application, the first lens 10 has a positive optical power. Accordingly, the lens 110 provided in the embodiment of the present application converges the light passing through the second lens 20 by using the first lens 10 with a positive optical power, which can not only reduce the size of the second lens 20, but also further reduce distortion. In addition, the reliability of the lens 110 and the clarity of the image can be further improved.

[0082] Since one of the two adjacent lenses in the first lens group 111 has positive power and the other lens has negative power, when the first lens 10 has positive power, the second lens 20 has negative power accordingly.

[0083] Of course, in addition to the positive optical power of the first lens 10, in one embodiment, the first lens 10 may also have a negative optical power, and correspondingly, the second lens 20 has a positive optical power.

[0084] It should be understood that the first lens 10 can have positive or negative optical power, both of which can improve the imaging quality. However, since the first lens 10 is closest to the image side and the positive optical power has the function of converging light, setting the first lens 10 to have a positive optical power can reduce the size of the second lens 20 while improving the imaging quality.

[0085] In the embodiment of the present application, since the first lens 10 has positive power and one of the two adjacent lenses in the first lens group 111 has positive power and the other lens has negative power, the third lens 30 has positive power and the fourth lens 40 has negative power. Of course, when the first lens 10 has negative power, the third lens 30 may have negative power and the fourth lens 40 may have positive power.

[0086] In some possible implementations, one of the fourth lens 40 and the fifth lens 50 has positive power, and the other lens has negative power.

[0087] Accordingly, the fourth lens 40 and the fifth lens 50 in the lens 110 provided in the embodiment of the present application have different optical focal lengths, which can not only reduce the size of the lens with negative optical focal length in the two lenses, but also increase the amount of light passing through the aperture 112, thereby further reducing distortion and improving reliability and clarity.

[0088] In the embodiment of the present application, since the first lens 10 has a positive focal power, the fourth lens 40 has a negative focal power, and the fifth lens 50 has a positive focal power. Accordingly, the fifth lens 50 in the lens 110 provided in the embodiment of the present application has a positive focal power, which can converge light and increase the amount of light entering the aperture 112, which helps to further reduce distortion and improve reliability and clarity.

[0089] Of course, since the first lens 10 may also have negative optical power, correspondingly, the fourth lens 40 has positive optical power, and the fifth lens 50 has negative optical power.

[0090] It can be understood that, in addition to having different optical powers, the fourth lens 40 and the fifth lens 50 can also have positive optical power or negative optical power in some possible implementations.

[0091] In some possible implementations, along the direction from the image side to the object side, one of the two lenses closest to the aperture 112 in the second lens group 113 has positive power, and the other lens has negative power.

[0092] Accordingly, the fifth lens 50 and the sixth lens 60 in the lens 110 provided in the embodiment of the present application have different optical powers, which can further reduce the distortion of the lens 110. In addition, the clarity of the imaging and / or the reliability of the lens 110 can be further improved.

[0093] It can be understood that, in the embodiment of the present application, two lenses in the second lens group 113 that are closest to the aperture 112 are the fifth lens 50 and the sixth lens 60 .

[0094] For example, Figure 1 As shown, the fifth lens 50 has positive power, and the sixth lens 60 has negative power. Of course, in one embodiment, the fifth lens 50 may also have negative power, and correspondingly, the sixth lens 60 may also have positive power.

[0095] Of course, in addition to having different optical powers, the fifth lens 50 and the sixth lens 60 may also have negative optical powers or positive optical powers in some embodiments.

[0096] In some possible implementations, at least two of the remaining lenses in the second lens group 113 have positive refractive power.

[0097] Correspondingly, at least two of the remaining lenses in the second lens group 113 of the lens 110 provided in the embodiment of the present application have positive optical power, which can converge light and increase the amount of light entering the lens 110, which helps to further reduce distortion and improve reliability and clarity.

[0098] In the embodiment of the present application, the remaining lenses in the second lens group 113 include the seventh lens 70, the eighth lens 80 and the ninth lens 90. When the number of lenses in the second lens group 113 exceeds five, the remaining lenses are all lenses except the fifth lens 50 and the sixth lens 60.

[0099] Exemplarily, the remaining lenses in the second lens group 113 have positive refractive power. Figure 1 As shown, the seventh lens 70, the eighth lens 80 and the ninth lens 90 all have positive power. By making the remaining lenses in the second lens group 113 have positive power, light can be gathered, which can not only reduce the size of two lenses in the second lens group 113, but also increase the amount of light entering the two lenses, thereby helping to further reduce distortion, improve reliability and clarity.

[0100] In some possible implementations, along the direction from the image side to the object side, one of the two lenses closest to the object side and the remaining lens closest to the aperture 112 has positive power, and the other lens has negative power.

[0101] Correspondingly, in the second lens group 113 of the lens 110 provided in the embodiment of the present application, one of the two lenses closest to the object side and the lens closest to the aperture 112 among the remaining lenses has positive focal power and the other lens has negative focal power, which can further reduce distortion and improve reliability and clarity.

[0102] In the embodiment of the present application, the lens closest to the object side of the two lenses is the sixth lens 60 , and the lens closest to the aperture 112 of the remaining lenses is the seventh lens 70 .

[0103] In the embodiment of the present application, since the seventh lens 70 has a positive optical power, the sixth lens 60 has a negative optical power. Of course, when the seventh lens 70 has a negative optical power, the sixth lens 60 may also have a positive optical power.

[0104] In some possible implementations, along the direction from the image side to the object side, the lens element closest to the object side in the second lens group 113 has positive refractive power.

[0105] Correspondingly, the lens closest to the object side in the second lens group 113 of the lens 110 provided in the embodiment of the present application has positive optical power, which can increase the amount of light entering the lens 110, thereby helping to further reduce distortion and improve reliability and clarity.

[0106] In the embodiment of the present application, the lens closest to the object side in the second lens group 113 is the ninth lens 90 , that is, the ninth lens 90 has positive refractive power.

[0107] It can be understood that, when the remaining lenses in the second lens group 113 include lenses with negative optical power, the ninth lens 90 may have negative optical power.

[0108] In some possible implementations, the first lens 10 may satisfy the relationship: 4.4<<f1 / f<<5.5, wherein f1 is the focal length of the first lens 10 , and f is the focal length of the lens 110 .

[0109] The specific ratio of f1 / f is not limited here. For example, the ratio of f1 / f may include but is not limited to 4.4, 4.45, 4.48, 4.5, 4.553, 4.557, 4.59, 4.6, 4.69, 4.70, 4.7012, 4.75, 4.78, 4.8, 4.84, 4.86, 4.9, 4.92, 4.99, 5.0, 5.11, 5.2, 5.3, 5.4, 5.5, etc.

[0110] In some possible implementations, the first lens 10 may satisfy the relationship: 58 mm<<f1<<72.5 mm.

[0111] There is no limitation on the specific value of f1. For example, the value of f1 may include but is not limited to 58mm, 58.9mm, 60mm, 61mm, 62.5mm, 62.99mm, 63mm, 63.5mm, 64.5mm, 65mm, 65.3mm, 65.966mm, 66mm, 66.5mm, 67mm, 67.5mm, 68mm, 68.5mm, 69mm, 69.5mm, 70mm, 70.5mm, 71mm, 71.5mm, 72mm, 72.5mm, etc.

[0112] In some possible implementations, the first lens 10 may satisfy the relationship: 4.2<<r1 / f<<5.2, wherein r1 is the radius of curvature of the image side surface of the first lens 10 .

[0113] The specific value of the ratio of r1 / f is not limited here. For example, the value of the ratio of r1 / f may include but is not limited to 4.2, 4.236, 4.25, 4.29, 4.3, 4.333, 4.35, 4.40, 4.41, 4.45, 4.48, 4.5, 4.553, 4.557, 4.591, 4.61, 4.69, 4.701, 4.73, 4.75, 4.78, 4.82, 4.84, 4.86, 4.9, 4.921, 4.99, 5.0, 5.11, 5.2, etc.

[0114] In some possible implementations, the first lens 10 may satisfy the relationship: 55 mm<<r1<<68.3 mm.

[0115] There is no limitation on the specific value of r1. For example, the value of r1 may include but is not limited to 55mm, 55.5mm, 56mm, 56.5mm, 57mm, 57.5mm, 57.9mm, 58mm, 58.6mm, 59mm, 59.9mm, 60mm, 61mm, 62.5mm, 62.99mm, 63mm, 63.5mm, 64.5mm, 65mm, 65.3mm, 65.966mm, 66mm, 66.52mm, 67mm, 67.51mm, 68mm, 68.3mm, etc.

[0116] In some possible implementations, the third lens 30 may satisfy the relationship: 2<<f3 / f<<2.5, where f3 is the focal length of the third lens 30 .

[0117] The specific ratio of f3 / f is not limited here. For example, the ratio of f3 / f may include but is not limited to 2, 2.1, 2.15, 2.2, 2.2298, 2.23, 2.35, 2.397, 2.4, 2.45, 2.488, 2.5, etc.

[0118] In some possible implementations, the third lens 30 may satisfy the relationship: 26.35 mm<<f3<<32.93 mm.

[0119] There is no limitation on the specific value of f3. For example, the value of f3 may include, but is not limited to, 26.35mm, 26.39mm, 26.3978mm, 27mm, 27.15mm, 27.9mm, 28mm, 29mm, 29.5mm, 30mm, 31mm, 31.2mm, 31.5mm, 31.9mm, 32mm, 32.1mm, 32.3mm, 32.33mm, 32.4mm, 32.5mm, 32.66mm, 32.7mm, 32.8mm, 32.9mm, 32.93mm, etc.

[0120] In some possible implementations, the fifth lens 50 may satisfy the relationship: 1.7<<f5 / f<<2.1, where f5 is the focal length of the fifth lens 50 .

[0121] The specific ratio of f5 / f is not limited here. For example, the ratio of f5 / f may include but is not limited to 1.7, 1.75, 1.79, 1.8, 1.82, 1.859, 1.9, 1.95, 2, 2.1, etc.

[0122] In some possible implementations, the fifth lens 50 may satisfy the relationship: 22.39 mm<<f5<<27.67 mm.

[0123] There is no limitation on the specific value of f5. For example, the value of f5 may include but is not limited to 22.39 mm, 22.5 mm, 22.9 mm, 23 mm, 23.5 mm, 23.9 mm, 24 mm, 24.5 mm, 25 mm, 25.5 mm, 25.9 mm, 26 mm, 26.5 mm, 27 mm, 27.5 mm, 27.67 mm, etc.

[0124] In some possible implementations, the ninth lens 90 may satisfy the relationship: 2.8<<f9 / f<<3.2, where f9 is the focal length of the ninth lens 90.

[0125] The specific ratio of f9 / f is not limited here. For example, the ratio of f9 / f may include but is not limited to 2.8, 2.85, 2.9, 2.95, 3.0, 3.15, 3.193, 3.2, etc.

[0126] In some possible implementations, the ninth lens 90 may satisfy the relationship: 36.88 mm<<f9<<42.2 mm.

[0127] There is no limitation on the specific value of f9. For example, the value of f9 may include but is not limited to 36.88mm, 36.9mm, 36.99mm, 37mm, 37.5mm, 37.95mm, 38mm, 38.5mm, 39mm, 39.5mm, 40mm, 41mm, 41.5mm, 42mm, 42.1mm, 42.2mm, etc.

[0128] In some possible implementations, the ninth lens 90 may satisfy the relationship: 2<<r9 / f<<2.55, where r9 is the radius of curvature of the image side surface of the ninth lens 90 .

[0129] The specific ratio of r9 / f is not limited here. For example, the ratio of r9 / f may include but is not limited to 2, 2.1, 2.15, 2.2, 2.295, 2.3, 2.31, 2.35, 2.4, 2.45, 2.5, 2.55, etc.

[0130] In some possible implementations, the ninth lens 90 may satisfy the relationship: 27mm<<r9<<34mm.

[0131] There is no limitation on the specific value of r9. For example, the value of r9 may include but is not limited to 27mm, 27.2mm, 27.5mm, 28mm, 28.5mm, 28.9mm, 29mm, 29.5mm, 29.9mm, 30mm, 30.5mm, 31mm, 31.5mm, 31.98mm, 32mm, 32.5mm, 32.59mm, 33mm, 33.5mm, 33.99mm, 34mm, etc.

[0132] In the embodiment of the present application, the distortion can be further reduced, the reliability and clarity can be improved, and the imaging quality can be improved by limiting the focal length of at least one of the first lens 10, the third lens 30, the fifth lens 50 and the fifth lens 50 and / or the ratio of the focal length of at least one lens to the focal length of the lens 110, and / or limiting the ratio of the radius of curvature of the image side surface of at least one lens of the first lens 10 and the ninth lens 90 to the focal length of the lens 110 and / or the radius of curvature of the image side surface of at least one lens.

[0133] It can be understood that, based on the structure of four lenses in front and five lenses in the back of the lens 110 and the different optical focal powers of two adjacent lenses in the first lens group 111, the more parameters such as the optical focal power of the lenses in the second lens group 113, the focal length of the lenses, the ratio of the focal length of the lenses to the focal length of the lens 110, the radius of curvature of the image side surface of the lenses, and the ratio of the radius of curvature of the image side surface of the lenses to the focal length of the lens 110 are limited, the better the imaging quality will be, that is, the distortion can be reduced as much as possible and the clarity and reliability can be improved.

[0134] In some possible implementations, each lens may be a spherical lens.

[0135] Accordingly, each lens element in the lens 110 provided in the embodiment of the present application is a spherical lens, which can not only reduce the manufacturing difficulty of the lens 110 but also improve the imaging quality.

[0136] Of course, in addition to being a spherical lens, in some possible implementations, all the lenses of the lens 110 may be spherical lenses, and another part may be aspherical lenses.

[0137] In some possible implementations, each lens is a glass lens.

[0138] Accordingly, each lens of the lens 110 provided in the embodiment of the present application is a glass lens, which can improve the reliability of the lens 110 and ensure the imaging quality.

[0139] Of course, each lens of the lens 110 may be an optical plastic lens in addition to a glass lens. In the embodiment of the present application, each lens is a glass lens, which can better adapt to the use environment of the vehicle and help improve the reliability of the lens 110.

[0140] The structure and performance of the lens 110 and the display device 100 provided in the embodiment of the present application are described below in conjunction with specific embodiments.

[0141] Continue to see Figure 1 As shown, the display device 100 provided in the embodiment of the present application includes a lens 110, a glass cover 130 and a projection optical machine 120 arranged in sequence from the image side to the object side. Among them, the lens 110 includes a first lens group 111, an aperture 112 and a second lens group 113 arranged in sequence from the image side to the object side. The first lens group 111 includes a first lens 10, a second lens 20, a third lens 30 and a fourth lens 40. The second lens group 113 includes a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80 and a ninth lens 90.

[0142] Among them, the first lens 10 has positive optical power, the second lens 20 has negative optical power, the third lens 30 has positive optical power, the fourth lens 40 has negative optical power, the fifth lens 50 has positive optical power, the sixth lens 60 has negative optical power, the seventh lens 70 has positive optical power, the eighth lens 80 has positive optical power, and the ninth lens 90 has positive optical power.

[0143] The focal length of the lens 110 is 13.174 mm.

[0144] Among them, the focal length of the first lens 10 is 65.5mm, which is greater than 58mm and less than 72.5mm, meeting the focal length requirement of the first lens 10. In addition, the ratio of the focal length of the first lens 10 to the focal length of the lens 110 = 65.5 / 13.174≈4.97, which is greater than 4.4 and less than 5.5, meeting the ratio requirement of the focal length of the first lens 10 to the focal length of the lens 110. In addition, the radius of curvature of the image side of the first lens 10 is 62.08mm, which is greater than 55mm and less than 68.3mm, meeting the requirement of the radius of curvature of the image side of the first lens 10. The ratio of the radius of curvature of the image side of the first lens 10 to the focal length of the lens 110 = 62.08 / 13.174≈4.71, which is greater than 4.2 and less than 5.2, meeting the requirements.

[0145] The focal length of the second lens 20 is -33.512 mm, where "-" indicates that the second lens 20 has a negative optical power.

[0146] Among them, the focal length of the third lens 30 is 29.mm, which is greater than 26.35mm and less than 32.98mm, meeting the focal length requirement of the third lens 30. In addition, the ratio of the focal length of the third lens 30 to the focal length of the lens 110 is 29 / 13.174≈2.201, which is greater than 2.0 and less than 2.5, meeting the ratio requirement of the focal length of the third lens 30 to the focal length of the lens 110.

[0147] The focal length of the fourth lens 40 is -18.358 mm.

[0148] Among them, the focal length of the fifth lens 50 is 25.235 mm, which is greater than 58 mm and less than 72.5 mm, meeting the focal length requirement of the fifth lens 50. In addition, the ratio of the focal length of the fifth lens 50 to the focal length of the lens 110 = 25.235 / 13.174≈1.916, which is greater than 1.7 and less than 2.1, meeting the ratio requirement of the focal length of the fifth lens 50 to the focal length of the lens 110.

[0149] Among them, the focal length of the sixth lens 60 is -16.264 mm, the focal length of the seventh lens 70 is 39.20 mm, and the focal length of the eighth lens 80 is 44.354 mm.

[0150] Among them, the focal length of the ninth lens 90 is 37.545mm, which is greater than 36.88mm and less than 42.2mm, and meets the focal length requirement of the ninth lens 90. In addition, the ratio of the focal length of the ninth lens 90 to the focal length of the lens 110 is 37.545 / 13.174≈2.85, which is greater than 2.8 and less than 3.2, and meets the ratio requirement of the focal length of the ninth lens 90 to the focal length of the lens 110. In addition, the radius of curvature of the image side of the ninth lens 90 is 30.46mm, which is greater than 27mm and less than 34mm, and meets the requirement of the radius of curvature of the image side of the ninth lens 90. The ratio of the radius of curvature of the image side of the ninth lens 90 to the focal length of the lens 110 is 30.46 / 13.174≈2.31, which is greater than 2.0 and less than 2.55, and meets the requirement.

[0151] Table 1 shows optical parameters of a lens 110 and optical elements in the display device 100 provided in this embodiment.

[0152]

[0153]

[0154] Among them, L1 is the first lens 10, L2 is the second lens 20, L3 is the third lens 30, L4 is the fourth lens 40, L5 is the aperture 112, L6 is the fifth lens 50, L7 is the fifth lens 50, L8 is the seventh lens 70, L9 is the eighth lens 80, L10 is the ninth lens 90, L11 is the glass cover 130, OBJ is the projection plane (object plane), and ImgH is the imaging plane.

[0155] R is the radius of curvature of the optical element (such as a lens or glass cover 130, etc.) at a position corresponding to the optical axis.

[0156] Th is the surface thickness of the optical element along the optical axis.

[0157] Nd is the refractive index of each optical element when d-ray is irradiated.

[0158] Vd is the Abbe number of the optical element.

[0159] Table 2 shows optical parameters of a lens 110 and a display device 100 provided in this embodiment.

[0160] <![CDATA[f1(mm)]]> 65.49 <![CDATA[f9(mm)]]> 37.55 <![CDATA[f2(mm)]]> -33.51 EFL(mm) 13.174 <![CDATA[f3(mm)]]> 29.88 TTL(mm) 74.8 <![CDATA[f44(mm)]]> -18.36 ImgH(mm) 4.75 <![CDATA[f5(mm)]]> 25.23 <![CDATA[f6(mm)]]> -16.26 Fno 2.0 <![CDATA[f7(mm)]]> 39.21 BFL(mm) 22.9 <![CDATA[f8(mm)]]> 44.35 D1(mm) 22

[0161] Among them, EFL is the focal length of the lens 110, FOV is the maximum field of view angle of the lens 110, Fno is the aperture of the lens 110, BFL is the back focal length of the lens 110, and D1 is the aperture of the first lens.

[0162] Figure 2 The spherical chromatic aberration diagram of the lens provided in this embodiment. Figure 2 In the figure, the ordinate represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction, in millimeters. Figure 2 In the figure, A corresponds to the axial aberration curve of light with a wavelength of 550nm passing through the lens of this embodiment, B corresponds to the axial aberration curve of light with a wavelength of 458nm passing through the lens of this embodiment, and C corresponds to the axial aberration curve of light with a wavelength of 620nm passing through the lens of this embodiment. Figure 2 It can be seen that in this embodiment, the axial aberration is controlled within a very small range and is well corrected.

[0163] Figure 3 The astigmatism field curvature diagram of the lens provided in this embodiment is: Figure 4 This is a distortion diagram of the lens provided in this embodiment. Figure 3In, A1 represents the field curvature value of the light with a wavelength of 550nm on the meridional image plane, A2 represents the field curvature value of the light with a wavelength of 550nm on the sagittal image plane, B1 represents the field curvature value of the light with a wavelength of 458nm on the meridional image plane, B2 represents the field curvature value of the light with a wavelength of 458nm on the sagittal image plane, C1 represents the field curvature value of the light with a wavelength of 620nm on the meridional image plane, and C2 represents the field curvature value of the light with a wavelength of 620nm on the sagittal image plane. Figure 4 In FIG. 1 , solid line A, solid line B, and solid line C respectively represent the distortion values ​​of light of different wavelengths passing through the lens of this embodiment. Figure 3 and Figure 4 It can be seen that the lens provided in this embodiment controls the field curvature and distortion within a corresponding range, which can meet the usage requirements.

[0164] Figure 5 This is a defocus curve diagram of the lens provided in this embodiment. Figure 5 In the figure, the ordinate is the modulus of the optical transfer function (OTF), and the abscissa represents the distance of the image plane from front to back. Figure 5 It can be seen that the lens of this embodiment has a good depth of field.

[0165] Figure 6 A relative illumination diagram of the lens provided in this embodiment. Figure 6 In the figure, the horizontal axis represents the actual image height in millimeters, and the vertical axis represents the relative illumination. Figure 6 It can be seen that the lens of this embodiment can obtain an image with uniform brightness, which can improve the image quality and the uniformity of the projected image.

[0166] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0167] In the embodiments of the present application, the devices or elements referred to or implied must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise precisely and specifically specified.

[0168] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0169] The term "plurality" in this article refers to two or more than two. The term "and / or" in this article is just a description of the association relationship of related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next related objects are in an "or" relationship. In a formula, the character " / " indicates that the previous and next related objects are in a "division" relationship.

[0170] It should be understood that the various numerical numbers involved in the embodiments of the present application are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0171] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A lens, characterized in that: It includes a first mirror group, an aperture, and a second mirror group arranged in sequence from the image side to the object side; The first lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence from the image side to the object side, the first lens is closest to the image side, and the fourth lens is closest to the aperture stop; The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence from the image side to the object side, and the fifth lens is closest to the aperture stop; Along the direction from the image side to the object side, one of the two adjacent lenses in the first lens group has positive optical power, and the other lens has negative optical power.

2. The lens according to claim 1, characterized in that: The first lens has positive optical power.

3. The lens according to claim 1 or 2, characterized in that: One of the fourth lens and the fifth lens has positive power, and the other lens has negative power.

4. The lens according to any one of claims 1 to 3, characterized in that: The fifth lens has positive power.

5. The lens according to any one of claims 1 to 4, characterized in that: Along the direction from the image side to the object side, one of the two lenses closest to the aperture stop in the second lens group has positive refractive power, and the other lens has negative refractive power.

6. The lens according to claim 5, characterized in that: At least two of the remaining lenses in the second lens group have positive refractive power.

7. The lens according to claim 6, characterized in that: Along the direction from the image side to the object side, one of the two lenses closest to the object side and the remaining lenses closest to the aperture has positive power and the other lens has negative power.

8. The lens according to claim 6, characterized in that: The remaining lenses in the second lens group have positive refractive power.

9. The lens according to any one of claims 1 to 8, characterized in that: Along the direction from the image side to the object side, the lens element in the second lens group closest to the object side has positive refractive power.

10. The lens according to any one of claims 1 to 9, characterized in that: The first lens satisfies the relationship: 4.4<<f1 / f<<5.5; wherein f1 is the focal length of the first lens, and f is the focal length of the lens.

11. The lens according to claim 10, characterized in that: The first lens satisfies the relationship: 58mm<<f1<<72.5mm.

12. The lens according to any one of claims 1 to 11, characterized in that: The first lens satisfies the relationship: 4.2<<r1 / f<<5.2; wherein r1 is the radius of curvature of the image side surface of the first lens.

13. The lens according to claim 12, characterized in that: The first lens satisfies the relationship: 55mm<<r1<<68.3mm.

14. The lens according to any one of claims 1 to 13, characterized in that: The third lens satisfies the relationship: 2<<f3 / f<<2.5; wherein f3 is the focal length of the third lens.

15. The lens according to claim 14, characterized in that: The third lens satisfies the relationship: 26.35mm<<f3<<32.93mm.

16. The lens according to any one of claims 1 to 15, characterized in that: The fifth lens satisfies the relationship: 1.7<<f5 / f<<2.1; wherein f5 is the focal length of the fifth lens.

17. The lens according to claim 16, characterized in that: The fifth lens satisfies the relationship: 22.39mm<<f5<<27.67mm.

18. The lens according to any one of claims 1 to 17, characterized in that: The ninth lens satisfies the relationship: 2.8<<f9 / f<<3.2; wherein f9 is the focal length of the ninth lens.

19. The lens according to claim 18, characterized in that: The ninth lens satisfies the relationship: 36.88mm<<f9<<42.2mm.

20. The lens according to any one of claims 1 to 19, characterized in that: The ninth lens satisfies the relationship: 2<<r9 / f<<2.55; wherein r9 is the radius of curvature of the image side surface of the ninth lens.

21. The lens according to claim 20, characterized in that: The ninth lens satisfies the relationship: 27mm<<r9<<34mm.

22. The lens according to any one of claims 1 to 21, characterized in that: Each of the lenses is a spherical lens.

23. The lens according to any one of claims 1 to 22, characterized in that: Each of the lenses is a glass lens.

24. A display device, characterized in that: It comprises a projection optical machine and a lens as described in any one of claims 1 to 23, wherein the lens is arranged on the light output side of the projection optical machine.

25. An electronic device, characterized in that: Comprising the display device as claimed in claim 24.

26. A means of transport, characterized in that: Comprising the display device as claimed in claim 24.

Images