Lens, projection apparatus, display device, and vehicle

Abstract

Embodiments of the present application relate to the technical field of lenses, and provide a lens, a projection apparatus, a display device, and a vehicle. The lens comprises a first lens group, an aperture, and a second lens group that 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 that are sequentially arranged from the image side to the object side; the fourth lens is close to the aperture; the first lens has positive focal power; the second lens has negative focal power; the third lens has positive focal power; and the fourth lens has negative focal power. 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; the fifth lens is close to the aperture; the fifth lens has positive focal power; the sixth lens has negative focal power; and the seventh lens, the eighth lens and the ninth lens all have positive focal power. In this way, the lens achieves a short projection distance, and is suitable for scenes with a small space and has high imaging clarity.

Description

Lenses, projection devices, display equipment, and vehicles

[0001] This application claims priority to Chinese Patent Application No. 202520120217.X, filed on January 17, 2025, entitled "Lens, Projection Device, Display Equipment and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of lens technology, and in particular to a lens, projection device, display device, and vehicle. Background Technology

[0003] With the development of intelligent vehicle technology, in-vehicle display and entertainment has gradually become an important direction in the evolution of intelligent vehicles. This is achieved by arranging projection devices and screens within the vehicle. The projection device includes a lens and an image source. The image source generates an image beam that forms an image and projects it onto the lens. The lens then projects the received image beam onto the screen, where it forms an image. However, the confined space inside a vehicle and the varying projection distances of the lenses in these technologies result in a significant discrepancy between the actual projection distance between the lens and the screen and the lens's actual projection distance. This leads to low image clarity, meaning that the low image clarity of the lenses used in in-vehicle projection degrades the user experience.

[0004] Utility Model Content

[0005] This application provides a lens, a projection device, a display device, and a vehicle. The lens has a short projection distance, making it suitable for small spaces while maintaining high image clarity.

[0006] In a first aspect, embodiments of this application provide a lens comprising a first lens group, an aperture stop, and a second lens group arranged sequentially 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 sequentially from the image side to the object side. The fourth lens is the lens closest to the aperture stop in the first lens group. The first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, and the fourth lens has negative optical power. The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from the image side to the object side. The fifth lens is the lens closest to the aperture stop in the second lens group. The fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh, eighth, and ninth lenses all have positive optical power.

[0007] In this embodiment, by placing the aperture between the fourth and fifth lenses, and with the optical power of the first to ninth lenses sequentially alternating between positive and negative (positive-negative-positive-negative-positive-positive), the projection distance of the lens is shortened, making it suitable for scenarios in smaller spaces (such as the confined space inside a vehicle). Simultaneously, the lens exhibits low distortion and high image clarity, achieving high-definition projection. Furthermore, it allows for a compact lens design, high temperature reliability, and an imaging field of view adaptable to the interior space of a vehicle, enhancing the user's viewing experience.

[0008] In some possible implementations, the lens satisfies the relationship: 1 < EFL1 / EFL < 1.72, where EFL1 is the focal length of the first lens group and EFL is the focal length of the lens.

[0009] In this implementation, by limiting the ratio of the focal length of the first lens group to the focal length of the lens to between 1 and 1.72, the image sharpness of the lens can be further improved, and the temperature reliability of the lens can be further improved.

[0010] In some possible implementations, the lens satisfies the relationship: 1 < EFL2 / EFL < 1.54, where EFL2 is the focal length of the second lens group and EFL is the focal length of the lens.

[0011] In this implementation, by limiting the ratio of the focal length of the second lens group to the focal length of the lens to between 1 and 1.54, the image sharpness of the lens can be further improved, and the temperature reliability of the lens can be further improved.

[0012] In some possible implementations, the lens satisfies the relationship: 13.86mm < EFL1 < 23.9mm, where EFL1 is the focal length of the first lens group.

[0013] In this implementation, by limiting the focal length of the first lens group to between 13.86mm and 23.9mm, the image sharpness of the lens can be further improved, and the temperature reliability of the lens can be further improved.

[0014] In some possible implementations, the lens satisfies the relationship: 14mm < EFL2 < 21.42mm, where EFL1 is the focal length of the first lens group.

[0015] In this implementation, by limiting the focal length of the second lens group to between 14mm and 21.42mm, the image sharpness of the lens can be further improved, and the temperature reliability of the lens can be further improved.

[0016] In some possible implementations, the lens satisfies the relationship: TTL < 80mm, where TTL is the total optical length of the lens.

[0017] In this implementation, the total optical length (TTL) of the lens is less than 80mm, which makes the lens small and suitable for confined spaces inside a vehicle.

[0018] In some possible implementations, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are all glass lenses or plastic lenses.

[0019] In this implementation, the more glass lenses in the lens, the better the lens's high-temperature resistance and the better its temperature reliability. Furthermore, plastic lenses are easier to manufacture, and a greater number of plastic lenses can reduce the lens's cost and improve its economic efficiency.

[0020] In some possible implementations, a portion of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are plastic lenses, while another portion are glass lenses.

[0021] In this implementation, the lens is composed of a glass lens and a plastic lens. The refractive index temperature coefficients of the glass lens and the plastic lens can be combined to achieve mutual compensation, which helps to reduce the thermal difference of the lens and realize the thermal difference reduction design of the lens. This allows the lens to be used in high and low temperature environments, ensuring the stability and reliability of the lens performance in different temperature environments.

[0022] In some possible implementations, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are all aspherical lenses or spherical lenses.

[0023] In this implementation, all lenses in the lens are spherical lenses, which can reduce the manufacturing difficulty of the lens and improve the image quality.

[0024] In some possible implementations, some of the lenses in the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are aspherical lenses, while others are spherical lenses.

[0025] In this implementation, the lens is composed of spherical and aspherical lenses. By combining spherical and aspherical lenses, the spherical aberration introduced by the spherical lens can be reduced or eliminated, ensuring the imaging performance of the lens and achieving a design that balances high reliability and low cost.

[0026] In some possible implementations, the first lens group has negative optical power. This allows light to be diffused, which helps to improve the holographic height of the image, increases the lens's field of view, increases the image size, and expands the user's viewing area.

[0027] In some possible implementations, the second lens group has positive optical power. This converges the light, increases the amount of light entering the lens, further reduces distortion, and improves the lens's image quality and reliability.

[0028] Secondly, embodiments of this application provide a projection device, which includes an image source and a lens as described in any of the first aspects. The light-emitting side of the image source is opposite to the ninth lens closest to the object side of the lens, and the image source is used to generate an image beam and project the image beam onto the lens.

[0029] In some possible implementations, the image source includes a light source and a modulation device. The modulation device is used to modulate the light emitted by the light source to obtain an image beam that includes image information.

[0030] In some possible implementations, the modulation device is any one of a liquid crystal display, a liquid crystal on silicon, a digital micromirror device, or a thin-film transistor.

[0031] Thirdly, embodiments of this application provide a display device, which includes a processor and a projection device as described in any of the second aspects. The processor is configured to send image data to an image source of the projection device, causing the image source to generate an image beam.

[0032] Fourthly, embodiments of this application provide a means of transportation that includes a display device as described in the third aspect or a projection device as described in the second aspect.

[0033] In some possible implementations, the vehicle also includes a vehicle body and a screen. The screen is located inside the vehicle body and is used to receive the image beam emitted by the projection device. Attached Figure Description

[0034] Figure 1 is a schematic diagram of a means of transportation provided in an embodiment of this application;

[0035] Figure 2 is a schematic diagram of the projection device and screen in Figure 1.

[0036] Figure 3 is a schematic diagram of the lens structure in Figure 2;

[0037] Figure 4 is a schematic diagram of a projection device provided in Embodiment 1 of this application;

[0038] Figure 5 shows the spherical chromatic aberration of the lens in Figure 4;

[0039] Figure 6 is the image bokeh curve of the lens in Figure 4;

[0040] Figure 7 shows the distortion diagram of the lens in Figure 4;

[0041] Figure 8 is a schematic diagram of a projection device provided in Embodiment 2 of this application;

[0042] Figure 9 shows the spherical chromatic aberration of the lens in Figure 8;

[0043] Figure 10 is a bokeh curve of the lens in Figure 8;

[0044] Figure 11 shows the distortion of the lens in Figure 8;

[0045] Figure 12 is a schematic diagram of a projection device provided in Embodiment 3 of this application;

[0046] Figure 13 is a spherical chromatic aberration diagram of the lens in Figure 12;

[0047] Figure 14 is the image bokeh curve of the lens in Figure 12;

[0048] Figure 15 shows the distortion of the lens in Figure 12;

[0049] Figure 16 is a schematic diagram of a projection device provided in Embodiment 4 of this application;

[0050] Figure 17 is a spherical chromatic aberration diagram of the lens in Figure 16;

[0051] Figure 18 is a bokeh curve of the lens in Figure 16;

[0052] Figure 19 shows the distortion of the lens in Figure 16.

[0053] Explanation of reference numerals in the attached drawings: 100, projection device; 110, lens; 111, first lens group; 112, aperture; 113, second lens group; 120, image source; 121, light source; 122, modulation device; 123, cover glass; 200, screen; 300, display device; G1, first lens; G2, second lens; G3, third lens; G4, fourth lens; G5, fifth lens; G6, sixth lens; G7, seventh lens; G8, eighth lens; G9, ninth lens. Detailed Implementation

[0054] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0055] To facilitate understanding, the relevant technical terms involved in the embodiments of this application will first be explained and described.

[0056] Focal length, also known as focal length, is a measure of the convergence or divergence 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 a scene at infinity is formed into a clear image on the focal plane.

[0057] The image side is the side where the image is located, with the lens as the boundary. The side of the lens facing the image side is the image-side surface of the lens.

[0058] The object side is the side where the modulation device (e.g., DMD) is located, and the side of the lens facing the object side is the object side surface.

[0059] Optical power characterizes the ability of a lens to refract an incident parallel beam of light.

[0060] Positive focal length means that the lens has a positive focal length and has the effect of converging light.

[0061] Negative optical power means that the lens has a negative focal length, which has the effect of diverging light.

[0062] Total track length (TTL) refers to the total length from the end of the optical lens furthest from the imaging surface to the imaging surface.

[0063] Thermal asymmetry refers to reducing or eliminating the impact of temperature on lens performance (such as imaging performance).

[0064] The temperature coefficient of refractive index refers to the coefficient relating the refractive index of an optical material to temperature changes.

[0065] Axial chromatic aberration, also known as longitudinal chromatic aberration or positional chromatic aberration, occurs when a beam of light parallel to the optical axis converges at different positions after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration. This is because the lens images different wavelengths of light at different positions, causing the images of different colors of light to not completely overlap during the final imaging process, resulting in the dispersion of polychromatic light.

[0066] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to aperture aberration; the height of the intersection point between the principal ray from different fields of view and the Gaussian image plane after passing through the optical system is not equal to the ideal image height, and this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing distortion in the image shape, but it does not affect the image's sharpness.

[0067] This application provides a means of transportation, which can be a car, truck, motorcycle, bus, boat, airplane, helicopter, lawnmower, recreational vehicle, amusement park vehicle, construction equipment, tram, golf cart, train, or handcart, etc. The following description uses a car as an example.

[0068] Figure 1 is a schematic diagram of a means of transportation provided in an embodiment of this application, and Figure 2 is a schematic diagram of the projection device and screen in Figure 1 working together.

[0069] As shown in Figure 1, the vehicle also includes a vehicle body, a screen 200, and a display device 300. The screen 200 and display device 300 are located inside the vehicle body. For example, the display device 300 is positioned on the roof above the second-row seats and is used to generate image beams. The screen 200 is positioned in front of the second-row seats and is used to receive the image beams emitted by the display device 300. The image beams form images on the screen 200 for viewing by passengers in the second-row seats, achieving in-vehicle projection and improving the user experience.

[0070] It should be noted that, in addition to being emitted onto the screen 200, in some embodiments, the image beam emitted by the display device 300 can also be emitted onto the window glass of a vehicle, and the image beam forms an image on the window glass. In this case, the vehicle may or may not have the screen 200.

[0071] For example, the display device 300 may include a processor and a projection device 100. As shown in FIG2, the projection device 100 includes an image source 120 and a lens 110. The image source 120 generates an image beam and projects it onto the lens 110, which then projects the received image beam onto a screen 200. The processor sends image data to the image source 120 of the projection device 100 to cause the image source 120 to generate the image beam.

[0072] It should be noted that, in addition to the image source 120 and the lens 110, the projection device 100 may also include other optical elements. For example, the projection device 100 may also include a diffusion screen located on the light exit carriage of the lens 110 to diffuse the image beam projected by the lens 110 and increase the diffusion angle (divergence angle) of the image beam.

[0073] A processor can be called a front-end processor. A processor includes one or more processing units, such as: an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). These different processing units can be independent devices or integrated into one or more processors.

[0074] In one embodiment, as shown in FIG2, the image source 120 includes a light source 121 and a modulation device 122. The modulation device 122 is used to modulate the light emitted by the light source 121 to obtain an image beam including image information. The modulation device 122 includes, but is not limited to, liquid crystal display (LCD), liquid crystal on silicon (LCOS), digital micromirror device (DMD), and thin film transistor (TFT).

[0075] In addition to the light source 121 and the modulation device 122, in some embodiments, as shown in FIG2, the image source 120 may also include a cover glass 123 (CG). The cover glass 123 is located on the light-emitting side of the modulation device 122 and protects the modulation device 122. The number of cover glasses 123 can be one or more, and there is no limitation here.

[0076] Figure 3 is a schematic diagram of the lens structure in Figure 2.

[0077] In this embodiment of the application, as shown in FIG3, the lens 110 includes a first lens group 111, an aperture stop 112, and a second lens group 113 arranged sequentially from the image side to the object side. The first lens group 111 includes a first lens G1, a second lens G2, a third lens G3, and a fourth lens G4 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the first lens group 111 is the fourth lens G4. The first lens G1 has positive optical power, the second lens G2 has negative optical power, the third lens G3 has positive optical power, and the fourth lens G4 has negative optical power. The second lens group 113 includes a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, and a ninth lens G9 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the second lens group 113 is the fifth lens G5. The ninth lens G9, which is closest to the object side in the lens 110, is opposite to the light-emitting side of the image source 120. The fifth lens G5 has positive optical power, the sixth lens G6 has negative optical power, and the seventh lens G7, the eighth lens G8, and the ninth lens G9 all have positive optical power.

[0078] By positioning the aperture stop 112 between the fourth lens G4 and the fifth lens G5, and ensuring that the optical power of the first lens G1 to the ninth lens G9 follows the positive-negative-positive-negative-positive-positive-positive sequence, the projection distance of the lens 110 is shortened. This makes it suitable for smaller spaces (such as the confined space inside a vehicle). Simultaneously, the lens 110 exhibits low distortion and high image clarity, achieving high-definition projection. Furthermore, it allows for a compact design, high temperature reliability, and an imaging field of view adaptable to the interior space of the vehicle, enhancing the user's viewing experience.

[0079] In some possible implementations, lens 110 satisfies the relationship: 1 < EFL1 / EFL < 1.72, where EFL1 is the focal length of the first lens group 111 and EFL is the focal length of lens 110. Thus, by limiting the ratio of the focal length of the first lens group 111 to the focal length of lens 110 to between 1 and 1.72, the image sharpness of lens 110 can be further improved, and the temperature reliability of lens 110 can also be further enhanced.

[0080] The specific ratio of the focal length of the first lens group 111 to the focal length of the lens 110 is not limited here. For example, the ratio of the focal length of the first lens group 111 to the focal length of the lens 110 can be 1.1, 1.15, 1.25, 1.35, 1.37, 1.46, 1.5, 1.66, 1.69, 1.70, 1.71, etc.

[0081] In some possible implementations, lens 110 satisfies the relationship: 1 < EFL² / EFL < 1.54, where EFL² is the focal length of the second lens group 113 and EFL is the focal length of lens 110. Thus, by limiting the ratio of the focal length of the second lens group 113 to the focal length of lens 110 to between 1 and 1.54, the image sharpness of lens 110 can be further improved, and the temperature reliability of lens 110 can also be further enhanced.

[0082] The specific ratio of the focal length of the second lens group 113 to the focal length of the lens 110 is not limited here. For example, the ratio of the focal length of the second lens group 113 to the focal length of the lens 110 can be 1.1, 1.15, 1.251, 1.34, 1.39, 1.45, 1.5, 1.52, 1.53, etc.

[0083] In some possible implementations, lens 110 satisfies the relationship: 13.86mm < EFL1 < 23.9mm, where EFL1 is the focal length of the first lens group 111. Thus, by limiting the focal length of the first lens group 111 to between 13.86mm and 23.9mm, the image sharpness of lens 110 can be further improved, and the temperature reliability of lens 110 can also be further improved.

[0084] The specific value of the focal length of the first lens group 111 is not limited here. For example, the focal length of the first lens group 111 can be 13.9mm, 14.5mm, 15.1mm, 16.5mm, 17.32mm, 18.27mm, 19.1mm, 20.9mm, 22.5mm, 23.4mm, etc.

[0085] In some possible implementations, lens 110 satisfies the relationship: 14mm < EFL2 < 21.42mm, where EFL1 is the focal length of the first lens group 111. Thus, by limiting the focal length of the second lens group 113 to between 14mm and 21.42mm, the image sharpness of lens 110 can be further improved, and the temperature reliability of lens 110 can also be further improved.

[0086] The specific value of the focal length of the second lens group 113 is not limited here. For example, the focal length of the second lens group 113 can be 14.5mm, 15.61mm, 16mm, 17mm, 17.32mm, 17.75mm, 18mm, 19.5mm, 20.5mm, 21.2mm, etc.

[0087] In some possible implementations, the lens 110 satisfies the relationship: TTL < 80mm, where TTL is the total optical length of the lens 110. Thus, the total optical length TTL of the lens 110 is less than 80mm, making the lens 110 small in size and suitable for use in confined spaces inside a vehicle.

[0088] The specific value of the total optical length of lens 110 is not limited here. For example, the total optical length of lens 110 can be 78mm, 78.1mm, 78.5mm, 78.9mm, 79mm, 79.5mm, etc.

[0089] In some possible implementations, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, and the ninth lens G9 are all glass lenses or plastic lenses. Thus, the more glass lenses in the lens 110, the better its high-temperature resistance and the better its temperature reliability. Furthermore, plastic lenses are easier to manufacture, and the more plastic lenses there are, the lower the cost of the lens 110 and the more economical it becomes.

[0090] In some possible implementations, a portion of the lenses in the first lens G1, second lens G2, third lens G3, fourth lens G4, fifth lens G5, sixth lens G6, seventh lens G7, eighth lens G8, and ninth lens G9 are plastic lenses, while the remaining portion are glass lenses. Thus, the lens 110, constructed from both glass and plastic lenses, can utilize the refractive index temperature coefficients of the glass and plastic lenses to achieve mutual compensation. This helps reduce the thermal difference in the lens 110, enabling a thermal differential design that allows the lens 110 to be used in both high and low temperature environments, ensuring the stability and reliability of its performance in different temperature scenarios.

[0091] In some possible implementations, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, and the ninth lens G9 are all aspherical lenses or spherical lenses.

[0092] When all the lenses in lens 110 are spherical lenses, the manufacturing difficulty of lens 110 can be reduced and the image quality can be improved.

[0093] In some possible implementations, a portion of the lenses in the first lens G1, second lens G2, third lens G3, fourth lens G4, fifth lens G5, sixth lens G6, seventh lens G7, eighth lens G8, and ninth lens G9 are aspherical lenses, while the remaining portion are spherical lenses. Thus, the lens 110 is constructed from a combination of spherical and aspherical lenses. By combining these lenses, spherical aberration introduced by the spherical lens can be reduced or eliminated, ensuring the imaging performance of the lens 110 and achieving a design that balances high reliability and low cost.

[0094] In some possible implementations, the first lens group 111 has negative optical power, which can diffuse light, help improve the holographic height of the image, increase the field of view of the lens 110, increase the size of the image, and increase the user's viewing area.

[0095] It should be noted that, in addition to having negative optical power, the first lens group 111 may also have positive optical power in some embodiments.

[0096] In some possible implementations, the second lens group 113 has positive optical power, which can converge light, increase the amount of light entering the lens 110, further reduce distortion, and improve the imaging quality and reliability of the lens 110.

[0097] It should be noted that, in addition to having positive optical power, the second lens group 113 may also have negative optical power in some embodiments.

[0098] The structure and performance of the lens 110 and projection device 100 provided in this application embodiment will be described below with reference to specific embodiments.

[0099] Implementation 1

[0100] Figure 4 is a schematic diagram of a projection device provided in Embodiment 1 of this application.

[0101] As shown in Figure 4, the projection device 100 includes a lens 110 and an image source 120. The image source 120 includes a cover glass 123, a modulator 122, and a light source 121 (not shown in the figure). The modulator 122 modulates the light emitted by the light source 121 to obtain an image beam including image information. The cover glass 123 is located between the light-emitting side of the modulator 122 and the light-receiving side of the lens 110, and is used to transmit the image beam emitted by the modulator 122 to the lens 110. Lens 110 includes a first lens group 111, an aperture stop 112, and a second lens group 113 arranged sequentially from the image side to the object side. The first lens group 111 includes a first lens G1, a second lens G2, a third lens G3, and a fourth lens G4 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the first lens group 111 is the fourth lens G4. The second lens group 113 includes a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, and a ninth lens G9 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the second lens group 113 is the fifth lens G5. The ninth lens G9 is closest to the object side and is located between the eighth lens G8 and the cover glass 123.

[0102] Any one of the lenses from the first lens G1 to the ninth lens G9 can be a glass lens or a plastic lens, and any one of the lenses from the first lens G1 to the ninth lens G9 can be a spherical lens or an aspherical lens.

[0103] The first lens G1 has positive optical power and a focal length of 64.38 mm.

[0104] The second lens G2 has negative optical power and a focal length of -20.24 mm.

[0105] The third lens G3 has positive optical power and a focal length of 18.90 mm.

[0106] The fourth lens G4 has negative optical power and a focal length of -12.61 mm.

[0107] The fifth lens G5 has positive optical power and a focal length of 23.20 mm.

[0108] The sixth lens G6 has negative optical power, and the focal length of the sixth lens G6 is -18.11mm.

[0109] The seventh lens G7 has positive optical power and a focal length of 142.73 mm.

[0110] The eighth lens G8 has positive optical power and a focal length of 54.96 mm.

[0111] The ninth lens G9 has positive optical power. The focal length of the ninth lens G9 is 35.61 mm.

[0112] The first lens group 111 has negative optical power, and the focal length of the first lens group 111 is EFL1 = -18.27mm. The ratio of the focal length EFL1 of the first lens group 111 to the focal length EFL of the lens 110 is: EFL1 / EFL = 1.31.

[0113] The second lens group 113 has positive optical power, and the focal length of the second lens group 113 EFL2 is 17.80mm. The ratio of the focal length EFL2 of the second lens group 113 to the focal length EFL of the lens 110 is: EFL2 / EFL = 1.281.

[0114] Table 1 shows the optical parameters of each optical element of the projection device 100 in Embodiment 1 of this application.

[0115] Where R is the radius of curvature of the optical element (such as a lens or cover glass 123) at the corresponding position on the optical axis, TH is the surface thickness of the optical element along the optical axis, Nd is the refractive index of each optical element when d-line is incident on it, and Vd is the Abbe number of the optical element.

[0116] Wherein, S1 is the image-side surface of the first lens G1, S2 is the object-side surface of the first lens G1, S3 is the image-side surface of the second lens G2, S4 is the object-side surface of the second lens G2, S5 is the image-side surface of the third lens G3, S6 is the object-side surface of the third lens G3, S7 is the image-side surface of the fourth lens G4, S8 is the object-side surface of the fourth lens G4, Stop is the aperture stop 112, S9 is the image-side surface of the fifth lens G5, S10 is the object-side surface of the fifth lens G5, and S11 is the image-side surface of the sixth lens G6. 2 is the object-side surface of the sixth lens G6, S13 is the image-side surface of the seventh lens G7, S14 is the object-side surface of the seventh lens G7, S15 is the image-side surface of the eighth lens G8, S16 is the object-side surface of the eighth lens G8, S17 is the image-side surface of the ninth lens G9, S18 is the object-side surface of the ninth lens G9, S19 is the image-side surface of the cover glass 123, S20 is the object-side surface of the cover glass 123, S21 to S23 are the modulation device 122, ImgH is the imaging surface, and OBJ is the projection surface (object surface).

[0117] Table 2 shows the optical parameters of lens 110 in Figure 4.

[0118] Wherein, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, f5 is the focal length of the fifth lens G5, f6 is the focal length of the sixth lens G6, f7 is the focal length of the seventh lens G7, f8 is the focal length of the eighth lens G8, f9 is the focal length of the ninth lens G9, TTL is the total optical length of lens 110, EFL1 is the focal length of the first lens group 111, and EFL2 is the focal length of the second lens group 113.

[0119] Figure 5 shows the spherical chromatic aberration diagram of the lens in Figure 4. In Figure 5, the vertical axis represents the normalized pupil coordinates, and the horizontal axis represents the aberration in the axial direction, in millimeters. In Figure 5, the three curves correspond to the axial aberration curves of light with a wavelength of 625nm, 550nm, and 455nm after passing through the lens 110 of this embodiment. As can be seen from Figure 5, in this embodiment, the axial aberration is controlled within a very small range, achieving good correction and enabling high-definition imaging.

[0120] Figure 6 shows the astigmatism field curvature of the lens in Figure 4, and Figure 7 shows the distortion of the lens in Figure 4. In Figure 6, S represents the field curvature value of light with a wavelength of 550 nm in the meridional image plane, and T represents the field curvature value of light with a wavelength of 550 nm in the sagittal image plane. In Figure 7, the solid line represents the distortion value of light with a center wavelength of 550 nm passing through the lens 110 of this embodiment. Combining Figures 6 and 7, it can be seen that the lens 110 provided in this embodiment controls the field curvature and distortion within the corresponding range, and can achieve high-definition imaging.

[0121] Example 2

[0122] Figure 8 is a schematic diagram of a projection device provided in Embodiment 2 of this application.

[0123] As shown in Figure 8, the projection device 100 includes a lens 110 and an image source 120. The image source 120 includes a cover glass 123, a modulator 122, and a light source 121 (not shown in the figure). The modulator 122 modulates the light emitted by the light source 121 to obtain an image beam including image information. The cover glass 123 is located between the light-emitting side of the modulator 122 and the light-receiving side of the lens 110, and is used to transmit the image beam emitted by the modulator 122 to the lens 110. Lens 110 includes a first lens group 111, an aperture stop 112, and a second lens group 113 arranged sequentially from the image side to the object side. The first lens group 111 includes a first lens G1, a second lens G2, a third lens G3, and a fourth lens G4 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the first lens group 111 is the fourth lens G4. The second lens group 113 includes a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, and a ninth lens G9 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the second lens group 113 is the fifth lens G5. The ninth lens G9 is closest to the object side and is located between the eighth lens G8 and the cover glass 123.

[0124] Any one of the lenses from the first lens G1 to the ninth lens G9 can be a glass lens or a plastic lens, and any one of the lenses from the first lens G1 to the ninth lens G9 can be a spherical lens or an aspherical lens.

[0125] The first lens G1 has positive optical power and a focal length of 67.45 mm.

[0126] The second lens G2 has negative optical power and a focal length of -22.10 mm.

[0127] The third lens G3 has positive optical power and a focal length of 19.02 mm.

[0128] The fourth lens G4 has negative optical power and a focal length of -12.28 mm.

[0129] The fifth lens G5 has positive optical power and a focal length of 25.12 mm.

[0130] The sixth lens G6 has negative optical power, and the focal length of the sixth lens G6 is -17.56mm.

[0131] The seventh lens G7 has positive optical power and a focal length of 99.66 mm.

[0132] The eighth lens G8 has positive optical power and a focal length of 60.97 mm.

[0133] The ninth lens G9 has positive optical power. The focal length of the ninth lens G9 is 32.48 mm.

[0134] The first lens group 111 has negative optical power, and the focal length of the first lens group 111 is EFL1 = -19.11mm. The ratio of the focal length EFL1 of the first lens group 111 to the focal length EFL of the lens 110 is: EFL1 / EFL = 1.38.

[0135] The second lens group 113 has positive optical power, and the focal length of the second lens group 113 EFL2 is 17.85mm. The ratio of the focal length EFL2 of the second lens group 113 to the focal length EFL of the lens 110 is: EFL2 / EFL = 1.284.

[0136] Table 3 shows the optical parameters of each optical element of the projection device 100 in Embodiment 2 of this application.

[0137] Where R is the radius of curvature of the optical element (such as a lens or cover glass 123) at the corresponding position on the optical axis, TH is the surface thickness of the optical element along the optical axis, Nd is the refractive index of each optical element when d-line is incident on it, and Vd is the Abbe number of the optical element.

[0138] Wherein, S1 is the image-side surface of the first lens G1, S2 is the object-side surface of the first lens G1, S3 is the image-side surface of the second lens G2, S4 is the object-side surface of the second lens G2, S5 is the image-side surface of the third lens G3, S6 is the object-side surface of the third lens G3, S7 is the image-side surface of the fourth lens G4, S8 is the object-side surface of the fourth lens G4, Stop is the aperture stop 112, S9 is the image-side surface of the fifth lens G5, S10 is the object-side surface of the fifth lens G5, and S11 is the image-side surface of the sixth lens G6. 2 is the object-side surface of the sixth lens G6, S13 is the image-side surface of the seventh lens G7, S14 is the object-side surface of the seventh lens G7, S15 is the image-side surface of the eighth lens G8, S16 is the object-side surface of the eighth lens G8, S17 is the image-side surface of the ninth lens G9, S18 is the object-side surface of the ninth lens G9, S19 is the image-side surface of the cover glass 123, S20 is the object-side surface of the cover glass 123, S21 to S23 are the modulation device 122, ImgH is the imaging surface, and OBJ is the projection surface (object surface).

[0139] Table 4 shows the optical parameters of lens 110 in Figure 8.

[0140] Wherein, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, f5 is the focal length of the fifth lens G5, f6 is the focal length of the sixth lens G6, f7 is the focal length of the seventh lens G7, f8 is the focal length of the eighth lens G8, f9 is the focal length of the ninth lens G9, TTL is the total optical length of lens 110, EFL1 is the focal length of the first lens group 111, and EFL2 is the focal length of the second lens group 113.

[0141] Figure 9 shows the spherical chromatic aberration diagram of the lens in Figure 8. In Figure 9, the vertical axis represents the normalized pupil coordinates, and the horizontal axis represents the aberration in the axial direction, in millimeters. In Figure 9, the three curves correspond to the axial aberration curves of light with a wavelength of 625nm, 550nm, and 455nm after passing through the lens 110 of this embodiment. As can be seen from Figure 9, in this embodiment, the axial aberration is controlled within a very small range, achieving good correction and enabling high-definition imaging.

[0142] Figure 10 shows the astigmatism field curvature of the lens in Figure 8, and Figure 11 shows the distortion of the lens in Figure 8. In Figure 10, S represents the field curvature value of light with a wavelength of 550 nm in the meridional image plane, and T represents the field curvature value of light with a wavelength of 550 nm in the sagittal image plane. In Figure 11, the solid line represents the distortion value of light with a center wavelength of 550 nm passing through the lens 110 of this embodiment. Combining Figures 10 and 11, it can be seen that the lens 110 provided in this embodiment controls the field curvature and distortion within the corresponding range, and can achieve high-definition imaging.

[0143] Example 3

[0144] Figure 12 is a schematic diagram of a projection device provided in Embodiment 3 of this application.

[0145] As shown in Figure 12, the projection device 100 includes a lens 110 and an image source 120. The image source 120 includes a cover glass 123, a modulator 122, and a light source 121 (not shown in the figure). The modulator 122 modulates the light emitted by the light source 121 to obtain an image beam including image information. The cover glass 123 is located between the light-emitting side of the modulator 122 and the light-receiving side of the lens 110, and is used to transmit the image beam emitted by the modulator 122 to the lens 110. Lens 110 includes a first lens group 111, an aperture stop 112, and a second lens group 113 arranged sequentially from the image side to the object side. The first lens group 111 includes a first lens G1, a second lens G2, a third lens G3, and a fourth lens G4 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the first lens group 111 is the fourth lens G4. The second lens group 113 includes a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, and a ninth lens G9 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the second lens group 113 is the fifth lens G5. The ninth lens G9 is closest to the object side and is located between the eighth lens G8 and the cover glass 123.

[0146] Any one of the lenses from the first lens G1 to the ninth lens G9 can be a glass lens or a plastic lens, and any one of the lenses from the first lens G1 to the ninth lens G9 can be a spherical lens or an aspherical lens.

[0147] The first lens G1 has positive optical power and a focal length of 61.15 mm.

[0148] The second lens G2 has negative optical power and a focal length of -28.95 mm.

[0149] The third lens G3 has positive optical power and a focal length of 23.49 mm.

[0150] The fourth lens G4 has negative optical power and a focal length of -11.79 mm.

[0151] The fifth lens G5 has positive optical power and a focal length of 27.02 mm.

[0152] The sixth lens G6 has negative optical power and a focal length of -17.25mm.

[0153] The seventh lens G7 has positive optical power and a focal length of 103.25 mm.

[0154] The eighth lens G8 has positive optical power and a focal length of 59.35 mm.

[0155] The ninth lens G9 has positive optical power. The focal length of the ninth lens G9 is 30.67 mm.

[0156] The first lens group 111 has negative optical power, and the focal length of the first lens group 111 is EFL1 = -19.92mm. The ratio of the focal length EFL1 of the first lens group 111 to the focal length EFL of the lens 110 is: EFL1 / EFL = 1.43.

[0157] The second lens group 113 has positive optical power, and the focal length of the second lens group 113 EFL2 is 17.79mm. The ratio of the focal length EFL2 of the second lens group 113 to the focal length EFL of the lens 110 is: EFL2 / EFL = 1.280.

[0158] Table 5 shows the optical parameters of each optical element of the projection device 100 of Embodiment 3 of this application.

[0159] Where R is the radius of curvature of the optical element (such as a lens or cover glass 123) at the corresponding position on the optical axis, TH is the surface thickness of the optical element along the optical axis, Nd is the refractive index of each optical element when d-line is incident on it, and Vd is the Abbe number of the optical element.

[0160] Wherein, S1 is the image-side surface of the first lens G1, S2 is the object-side surface of the first lens G1, S3 is the image-side surface of the second lens G2, S4 is the object-side surface of the second lens G2, S5 is the image-side surface of the third lens G3, S6 is the object-side surface of the third lens G3, S7 is the image-side surface of the fourth lens G4, S8 is the object-side surface of the fourth lens G4, Stop is the aperture stop 112, S9 is the image-side surface of the fifth lens G5, S10 is the object-side surface of the fifth lens G5, and S11 is the image-side surface of the sixth lens G6. 2 is the object-side surface of the sixth lens G6, S13 is the image-side surface of the seventh lens G7, S14 is the object-side surface of the seventh lens G7, S15 is the image-side surface of the eighth lens G8, S16 is the object-side surface of the eighth lens G8, S17 is the image-side surface of the ninth lens G9, S18 is the object-side surface of the ninth lens G9, S19 is the image-side surface of the cover glass 123, S20 is the object-side surface of the cover glass 123, S21 to S23 are the modulation device 122, ImgH is the imaging surface, and OBJ is the projection surface (object surface).

[0161] Table 6 shows the optical parameters of lens 110 in Figure 12.

[0162] Wherein, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, f5 is the focal length of the fifth lens G5, f6 is the focal length of the sixth lens G6, f7 is the focal length of the seventh lens G7, f8 is the focal length of the eighth lens G8, f9 is the focal length of the ninth lens G9, TTL is the total optical length of lens 110, EFL1 is the focal length of the first lens group 111, and EFL2 is the focal length of the second lens group 113.

[0163] Figure 13 shows the spherical chromatic aberration diagram of the lens in Figure 12. In Figure 13, the vertical axis represents the normalized pupil coordinates, and the horizontal axis represents the aberration in the axial direction, in millimeters. In Figure 13, the three curves correspond to the axial aberration curves of light with a wavelength of 625 nm, 550 nm, and 455 nm after passing through the lens 110 of this embodiment. As can be seen from Figure 13, in this embodiment, the axial aberration is controlled within a very small range, achieving good correction and enabling high-definition imaging.

[0164] Figure 14 shows the astigmatism field curvature of the lens in Figure 12, and Figure 15 shows the distortion of the lens in Figure 12. In Figure 14, S represents the field curvature value of light with a wavelength of 550 nm in the meridional image plane, and T represents the field curvature value of light with a wavelength of 550 nm in the sagittal image plane. In Figure 15, the solid line represents the distortion value of light with a center wavelength of 550 nm passing through the lens 110 of this embodiment. Combining Figures 14 and 15, it can be seen that the lens 110 provided in this embodiment controls the field curvature and distortion within the corresponding range, and can achieve high-definition imaging.

[0165] Example 4

[0166] Figure 16 is a schematic diagram of a projection device provided in Embodiment 4 of this application.

[0167] As shown in Figure 16, the projection device 100 includes a lens 110 and an image source 120. The image source 120 includes a cover glass 123, a modulator 122, and a light source 121 (not shown in the figure). The modulator 122 modulates the light emitted by the light source 121 to obtain an image beam including image information. The cover glass 123 is located between the light-emitting side of the modulator 122 and the light-receiving side of the lens 110, and is used to transmit the image beam emitted by the modulator 122 to the lens 110. Lens 110 includes a first lens group 111, an aperture stop 112, and a second lens group 113 arranged sequentially from the image side to the object side. The first lens group 111 includes a first lens G1, a second lens G2, a third lens G3, and a fourth lens G4 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the first lens group 111 is the fourth lens G4. The second lens group 113 includes a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, and a ninth lens G9 arranged sequentially from the image side to the object side. The lens closest to the aperture stop 112 in the second lens group 113 is the fifth lens G5. The ninth lens G9 is closest to the object side and is located between the eighth lens G8 and the cover glass 123.

[0168] Any one of the lenses from the first lens G1 to the ninth lens G9 can be a glass lens or a plastic lens, and any one of the lenses from the first lens G1 to the ninth lens G9 can be a spherical lens or an aspherical lens.

[0169] The first lens G1 has positive optical power and a focal length of 61.52 mm.

[0170] The second lens G2 has negative optical power and a focal length of -20.36 mm.

[0171] The third lens G3 has positive optical power and a focal length of 20.30 mm.

[0172] The fourth lens G4 has negative optical power and a focal length of -12.68 mm.

[0173] The fifth lens G5 has positive optical power and a focal length of 20.94 mm.

[0174] The sixth lens G6 has negative optical power, and the focal length of the sixth lens G6 is -16.67mm.

[0175] The seventh lens G7 has positive optical power and a focal length of 159.52 mm.

[0176] The eighth lens G8 has positive optical power and a focal length of 57.16 mm.

[0177] The ninth lens G9 has positive optical power. The focal length of the ninth lens G9 is 33.35 mm.

[0178] The first lens group 111 has negative optical power, and the focal length of the first lens group 111 is EFL1 = -17.32mm. The ratio of the focal length EFL1 of the first lens group 111 to the focal length EFL of the lens 110 is: EFL1 / EFL = 1.25.

[0179] The second lens group 113 has positive optical power, and the focal length of the second lens group 113 EFL2 is 17.51mm. The ratio of the focal length EFL2 of the second lens group 113 to the focal length EFL of the lens 110 is: EFL2 / EFL = 1.260.

[0180] Table 7 shows the optical parameters of each optical element of the projection device 100 of Embodiment 4 of this application.

[0181] Where R is the radius of curvature of the optical element (such as a lens or cover glass 123) at the corresponding position on the optical axis, TH is the surface thickness of the optical element along the optical axis, Nd is the refractive index of each optical element when d-line is incident on it, and Vd is the Abbe number of the optical element.

[0182] Wherein, S1 is the image-side surface of the first lens G1, S2 is the object-side surface of the first lens G1, S3 is the image-side surface of the second lens G2, S4 is the object-side surface of the second lens G2, S5 is the image-side surface of the third lens G3, S6 is the object-side surface of the third lens G3, S7 is the image-side surface of the fourth lens G4, S8 is the object-side surface of the fourth lens G4, Stop is the aperture stop 112, S9 is the image-side surface of the fifth lens G5, S10 is the object-side surface of the fifth lens G5, and S11 is the image-side surface of the sixth lens G6. 2 is the object-side surface of the sixth lens G6, S13 is the image-side surface of the seventh lens G7, S14 is the object-side surface of the seventh lens G7, S15 is the image-side surface of the eighth lens G8, S16 is the object-side surface of the eighth lens G8, S17 is the image-side surface of the ninth lens G9, S18 is the object-side surface of the ninth lens G9, S19 is the image-side surface of the cover glass 123, S20 is the object-side surface of the cover glass 123, S21 to S23 are the modulation device 122, ImgH is the imaging surface, and OBJ is the projection surface (object surface).

[0183] Table 8 shows the optical parameters of lens 110 in Figure 16.

[0184] Wherein, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, f5 is the focal length of the fifth lens G5, f6 is the focal length of the sixth lens G6, f7 is the focal length of the seventh lens G7, f8 is the focal length of the eighth lens G8, f9 is the focal length of the ninth lens G9, TTL is the total optical length of lens 110, EFL1 is the focal length of the first lens group 111, and EFL2 is the focal length of the second lens group 113.

[0185] Figure 17 shows the spherical chromatic aberration diagram of the lens in Figure 16. In Figure 17, the vertical axis represents the normalized pupil coordinates, and the horizontal axis represents the aberration in the axial direction, in millimeters. In Figure 17, the three curves correspond to the axial aberration curves of light with a wavelength of 625 nm, 550 nm, and 455 nm after passing through the lens 110 of this embodiment. As can be seen from Figure 17, in this embodiment, the axial aberration is controlled within a very small range, achieving good correction and enabling high-definition imaging.

[0186] Figure 18 shows the astigmatism field curvature of the lens in Figure 16, and Figure 19 shows the distortion of the lens in Figure 16. In Figure 18, S represents the field curvature value of light with a wavelength of 550 nm in the meridional image plane, and T represents the field curvature value of light with a wavelength of 550 nm in the sagittal image plane. In Figure 19, the solid line represents the distortion value of light with a center wavelength of 550 nm passing through the lens 110 of this embodiment. Combining Figures 18 and 19, it can be seen that the lens 110 provided in this embodiment 4 controls the field curvature and distortion within the corresponding range, and can achieve high-definition imaging.

[0187] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances. The terms "first," "second," "third," "fourth," etc. (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0188] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lens (110), characterized in that, It includes a first mirror group (111), an aperture (112), and a second mirror group (113) arranged sequentially from the image side to the object side; The first lens group (111) includes a first lens (G1), a second lens (G2), a third lens (G3), and a fourth lens (G4) arranged sequentially from the image side to the object side. The lens closest to the aperture stop (112) in the first lens group (111) is the fourth lens (G4). The first lens (G1) has positive optical power, the second lens (G2) has negative optical power, the third lens (G3) has positive optical power, and the fourth lens (G4) has negative optical power. The second lens group (113) includes a fifth lens (G5), a sixth lens (G6), a seventh lens (G7), an eighth lens (G8), and a ninth lens (G9) arranged sequentially from the image side to the object side. The lens closest to the aperture stop (112) in the second lens group (113) is the fifth lens (G5). The fifth lens (G5) has positive optical power, the sixth lens (G6) has negative optical power, and the seventh lens (G7), the eighth lens (G8), and the ninth lens (G9) all have positive optical power.

2. The lens (110) according to claim 1, characterized in that, The lens (110) satisfies the following relationship: 1 < EFL1 / EFL < 1.72, where EFL1 is the focal length of the first lens group (111) and EFL is the focal length of the lens (110).

3. The lens (110) according to claim 1, characterized in that, The lens (110) satisfies the following relationship: 1 < EFL2 / EFL < 1.54, where EFL2 is the focal length of the second lens group (113) and EFL is the focal length of the lens (110).

4. The lens (110) according to any one of claims 1 to 3, characterized in that, The lens (110) satisfies the following relationship: 13.86mm < EFL1 < 23.9mm, where EFL1 is the focal length of the first lens group (111).

5. The lens (110) according to any one of claims 1 to 3, characterized in that, The lens (110) satisfies the following relationship: 14mm < EFL2 < 21.42mm, where EFL1 is the focal length of the first lens group (111).

6. The lens (110) according to any one of claims 1 to 3, characterized in that, The lens (110) satisfies the following relationship: TTL < 80mm, where TTL is the total optical length of the lens (110).

7. The lens (110) according to any one of claims 1 to 3, characterized in that, The first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4), the fifth lens (G5), the sixth lens (G6), the seventh lens (G7), the eighth lens (G8), and the ninth lens (G9) are all glass lenses or plastic lenses; or, Of the first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4), the fifth lens (G5), the sixth lens (G6), the seventh lens (G7), the eighth lens (G8), and the ninth lens (G9), a portion of the lenses are plastic lenses and another portion are glass lenses.

8. The lens (110) according to any one of claims 1 to 3, characterized in that, The first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4), the fifth lens (G5), the sixth lens (G6), the seventh lens (G7), the eighth lens (G8), and the ninth lens (G9) are all aspherical lenses or spherical lenses; or, Of the first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4), the fifth lens (G5), the sixth lens (G6), the seventh lens (G7), the eighth lens (G8), and the ninth lens (G9), a portion of the lenses are aspherical lenses and the other portion are spherical lenses.

9. A projection device (100), characterized in that, Includes an image source (120) and a lens (110) as described in any one of claims 1 to 8; The light-emitting side of the image source (120) is opposite to the ninth lens (G9) closest to the object side in the lens (110). The image source (120) is used to generate an image beam and emit the image beam to the lens (110).

10. The projection device (100) according to claim 9, characterized in that, The image source (120) includes: Light source (121); A modulation device (122) is used to modulate the light emitted by the light source (121) to obtain the image beam including image information.

11. The projection device (100) according to claim 10, characterized in that, The modulation device (122) is any one of a liquid crystal display, a digital micromirror device, or a thin-film transistor.

12. A display device, characterized in that, Includes a processor and a projection device (100) as described in any one of claims 9 to 11; The processor is used to send image data to the image source (120) of the projection device (100) so that the image source (120) generates the image beam.

13. A means of transportation, characterized in that, Includes the display device as described in claim 12 or the projection device (100) as described in any one of claims 9 to 11.

14. The means of transport according to claim 13, characterized in that, The means of transport also includes: Body; A screen (200) is located inside the vehicle body and is used to receive the image beam emitted by the projection device (100).

Images