Projection lens, projection device, vehicle lamp and vehicle

Abstract

The invention provides a projection lens which can be applied to a projection device, an intelligent vehicle lamp and a vehicle. The projection lens provided by the invention has a large aperture and a large field angle range, and can give consideration to high-quality projection of a vehicle in a normal driving state and a near-field welcome state. The projection lens provided by the invention is used for receiving image light and generating an image corresponding to the image light based on image light projection. The projection lens comprises a wedge-shaped prism and a plurality of lenses which are sequentially arranged from an object side to an image side. Wherein the plurality of lenses have different focal powers and are used for sequentially transmitting image light. And the wedge-shaped prism is used for changing the optical path of the image light sequentially transmitted by the plurality of lenses.

Description

Technical Field

[0001] The present application relates to the technical field of smart vehicles, and more specifically, to a projection lens, a projection device, a vehicle lamp and a vehicle. Background Art

[0002] At present, with the development of smart car technology, it is required that the car headlights have not only traditional lighting functions, but also projection functions to meet the needs of welcoming guests, information interaction, automatic driving, etc. Therefore, in the design of the projection lens architecture of the headlight, it is required that the projection headlight system can effectively take into account the normal driving state and the comprehensive projection performance in the near-field welcoming state. At present, it is often difficult to take into account the projection optical performance of the two in the design of the projection lens. In addition, as smart headlights receive more and more attention and development, the requirements for projection lenses are gradually becoming more stringent. For example, the projection lens is required to have a large aperture, which can achieve a large field of view (FOV) and a high projection quality. However, the larger the field of view of the projection lens, the more serious the negative impact on the optical imaging performance of the projection lens. Therefore, in order to meet the increasingly prominent demand for smart headlights, how to take into account the high-quality projection in the normal driving state and the near-field welcoming state, and at the same time realize a projection headlight optical system with a large aperture and a large field of view is an urgent problem to be solved. Summary of the invention

[0003] The present application provides a projection lens, a projection device, a vehicle lamp and a vehicle. The projection lens provided in the present application has the characteristics of a large aperture and a large field of view. When applied to an intelligent vehicle lamp system, it can provide high-quality projection in both normal driving and near-field welcoming states.

[0004] In the first aspect, the embodiment of the present application provides a projection lens. The projection lens includes a wedge-shaped prism and a plurality of lenses arranged in sequence from the object side to the image side, the projection lens is used to receive image light, and generate an image corresponding to the image light based on the image light projection; the plurality of lenses sequentially transmit the image light, and the plurality of lenses have different optical powers; the wedge-shaped prism is used to change the optical path of the image light sequentially transmitted by the plurality of lenses, and the wedge angle range of the wedge-shaped prism is 4.5° to 8.5°.

[0005] It should be noted that, in the present application, the number of the multiple lenses may be 4, 5, 6 or 7.

[0006] Based on the projection lens provided by the present application, the wedge angle range of the wedge prism is used to control the offset of the image light, so that the projection area of ​​the projection lens can be controlled and adjusted, and the projection characteristics of a large field angle and a large aperture can be possessed, so as to achieve the projection requirements in different application scenarios. At the same time, since each lens has a different optical focal length, it can be ensured that each lens bears a part of the optical effect, so as to ensure that the imaging quality required by the projection lens is achieved when used in combination. Among them, a lens with positive optical focal length can converge the incident light to avoid the loss of light; a lens with negative optical focal length can expand the light beam and increase the imaging distance of the projection lens. In addition, the use of a combination of multiple lenses can achieve optimal coordination between the lenses, which has a good effect of adjusting optical aberrations.

[0007] In combination with the first aspect, in some implementations of the first aspect, the aperture F value of the projection lens satisfies: F#≥1.3.

[0008] Based on this solution, the projection lens provided in this application has large aperture imaging, which can achieve clear projection at close range. At the same time, the large aperture projection lens can allow image light to enter the projection lens as much as possible, thereby ensuring the reliability of projection in dark environments.

[0009] In combination with the first aspect, in certain implementations of the first aspect, a back focal length BFL of the projection lens satisfies: BFL>38 mm.

[0010] Based on this solution, the projection lens provided in the present application has a longer rear working distance. When applied to the projection lens architecture design of a car lamp, sufficient working distance can be reserved for arranging the corresponding lighting optical path.

[0011] In combination with the first aspect, in some implementations of the first aspect, a field of view FOV of the lens satisfies: FOV ≥ 14°.

[0012] Based on this solution, the projection lens provided in this application has a larger field of view, and can achieve a projection effect with a larger illumination distribution and a larger projection range.

[0013] In combination with the first aspect, in some implementations of the first aspect, the plurality of lenses include a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side. The optical focal power of the first lens is negative; the optical focal power of the second lens is positive; the optical focal power of the third lens is negative; and the optical focal power of the fourth lens is positive.

[0014] In combination with the first aspect, in certain implementations of the first aspect, a radius R1 of the first surface of the first lens satisfies: -25 mm<R1<-15 mm, and a radius R2 of the second surface of the first lens satisfies: -50 mm<R2<-15 mm.

[0015] Based on this solution, by limiting the radii of the two surfaces of the first lens, the projection lens has a larger field angle and a larger aperture F value.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the focal length range of the first lens is -982.1mm<f1<-768.6mm, the focal length range of the second lens is 50.4<f2<64.4mm, the focal length range of the third lens is -80.5<f3<63mm, and the focal length range of the fourth lens is 52mm<f4<66.4mm.

[0017] In some embodiments, the focal length of the second lens may also be f2=56.00 mm.

[0018] In combination with the first aspect, in certain implementations of the first aspect, an aperture D1 of the first lens satisfies: 32 mm<D1<44 mm.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the plurality of lenses include a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged in sequence from the object side to the image side. The fifth lens has a positive optical focal power; the sixth lens has a negative optical focal power; the seventh lens has a positive optical focal power; the eighth lens has a positive optical focal power; and the ninth lens has a negative optical focal power.

[0020] In combination with the first aspect, in some implementations of the first aspect, a radius R1 of the first surface of the fifth lens satisfies: 40 mm<R1<60 mm, and a radius R2 of the second surface of the fifth lens satisfies: 150 mm<R2<600 mm.

[0021] In combination with the first aspect, in some implementations of the first aspect, the focal length range of the fifth lens is 60.82mm<f5<79.58mm, the focal length range of the sixth lens is -42.3mm<f6<-33.10mm, the focal length range of the seventh lens is 43.1mm<f7<54.9mm, the focal length range of the eighth lens is 57.8mm<f8<73.8mm, and the focal length range of the ninth lens is -135.0mm<f9<-104.8mm.

[0022] In some embodiments, the focal length of the fifth lens may be f5=70.27 mm, the focal length of the sixth lens may be f6=-37.78 mm, the focal length of the seventh lens may be f7=49.00 mm, and the focal length of the ninth lens may be f9=-119.1638 mm.

[0023] In combination with the first aspect, in certain implementations of the first aspect, an aperture D5 of the fifth lens satisfies: 36 mm<D5<44 mm.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the plurality of lenses include a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged in sequence from the object side to the image side. The optical focal power of the tenth lens is positive; the optical focal power of the eleventh lens is negative; the optical focal power of the twelfth lens is negative; the optical focal power of the thirteenth lens is negative; the optical focal power of the fourteenth lens is positive; the optical focal power of the fifteenth lens is positive; and the optical focal power of the sixteenth lens is negative.

[0025] In combination with the first aspect, in some implementations of the first aspect, a radius R1 of the first surface of the tenth lens satisfies: 80 mm < R1 ≤ 109.98 mm, and a radius R2 of the second surface of the tenth lens satisfies: 53.7 mm ≤ R2 < ∞.

[0026] In combination with the first aspect, in some implementations of the first aspect, the focal length range of the tenth lens is 112.7mm<f10<139.3mm, the focal length range of the eleventh lens is -54.5mm<f11<-44.1mm, the focal length range of the twelfth lens is -1342mm<f12<-1220mm, the focal length range of the thirteenth lens is -70.62mm<f13<-57.14mm, the focal length range of the fourteenth lens is 39.5mm<f14<48.8mm, the focal length range of the fifteenth lens is 32.5mm<f15<40.2mm, and the focal length range of the sixteenth lens is -132.0mm<f16<-106.8mm.

[0027] Based on the focal length configuration parameters provided in the embodiments of the present application, by configuring the focal length of the tenth lens, the optical aberrations such as the optical distortion of the projection lens can be adjusted and corrected, thereby improving the optical performance of the projection lens. By configuring the focal length of the sixteenth lens, the rear working distance of the projection lens can be increased, so that the projection lens can be used in conjunction with different optical systems to meet various application requirements.

[0028] In combination with the first aspect, in certain implementations of the first aspect, an aperture D10 of the tenth lens satisfies: 18 mm<D10<22 mm.

[0029] In combination with the first aspect, in some implementations of the first aspect, a surface shape of each lens of the plurality of lenses is spherical.

[0030] Based on this solution, the projection lens provided in the embodiment of the present application adopts a spherical design, which is easy to produce, reduces production costs, and improves the economy of the system.

[0031] In combination with the first aspect, in some implementations of the first aspect, the material of the multiple lenses is optical glass or optical plastic.

[0032] Based on this solution, the projection lens provided in the embodiment of the present application adopts common materials such as optical glass or optical plastic, which is easy to produce and reduces production costs.

[0033] In a second aspect, an embodiment of the present application provides a projection device. The device includes: a display unit and a projection lens as described in the first aspect and any possible implementation of the first aspect. The display unit is used to generate the image light.

[0034] In combination with the second aspect, in some implementations of the second aspect, the display unit is a liquid crystal on silicon (LCoS) chip or a digital micromirror device (DMD) chip.

[0035] In a third aspect, an embodiment of the present application provides a vehicle lamp. The vehicle lamp comprises: a projection device and a lighting unit as described in the second aspect and any possible implementation of the second aspect. The lighting unit is used to generate a light beam carrying the image light and project the light beam to the display unit.

[0036] Based on the projection lens provided in the present application, when applied to vehicle-mounted imaging, a projection headlight with an illumination range, large aperture and wide viewing angle that meets the vehicle-mounted requirements can be provided. The lens design of the headlight provided in the embodiment of the present application has low manufacturing cost, good system stability and high imaging quality.

[0037] In a fourth aspect, an embodiment of the present application provides a vehicle, wherein the vehicle comprises the vehicle lamp as described in the implementation of the third aspect.

[0038] The beneficial effects brought about by the second to fourth aspects mentioned above can be specifically referred to the description of the beneficial effects in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram showing an application scenario of the projection lens provided in an embodiment of the present application is shown.

[0040] Figure 2 A schematic structural block diagram of a projection lens 200 provided in an embodiment of the present application is shown.

[0041] Figure 3A schematic structural diagram of an optical imaging system 30 composed of a first projection lens 300 provided in an embodiment of the present application is shown.

[0042] Figure 4 A diagram of spherical chromatic aberration of projection lens 300 is shown.

[0043] Figure 5 A diagram of field curvature of projection lens 300 is shown.

[0044] Figure 6 A distortion diagram of projection lens 300 is shown.

[0045] Figure 7 A schematic structural diagram of an optical imaging system 70 composed of a second projection lens 700 provided in an embodiment of the present application is shown.

[0046] Figure 8 A diagram of spherical chromatic aberration of projection lens 700 is shown.

[0047] Fig. 9 A diagram of field curvature of projection lens 700 is shown.

[0048] Fig.10 A distortion diagram of projection lens 700 is shown.

[0049] Fig.11 A schematic structural diagram of an optical imaging system 110 composed of a third projection lens 1100 provided in an embodiment of the present application is shown.

[0050] Fig.12 A diagram of spherical chromatic aberration of projection lens 1100 is shown.

[0051] Fig.13 A diagram of field curvature of projection lens 1100 is shown.

[0052] Fig.14 A distortion diagram of projection lens 1100 is shown.

[0053] Fig.15 A schematic structural diagram of a projection device 1500 provided in an embodiment of the present application is shown.

[0054] Fig.16 A schematic structural diagram of a vehicle lamp 1600 provided in an embodiment of the present application is shown.

[0055] Fig.17 A schematic structural diagram of a vehicle lighting system 1700 provided in an embodiment of the present application is shown.

[0056] Fig.18 A circuit diagram of a projection device provided in an embodiment of the present application is shown.

[0057] Fig.19A possible functional framework schematic diagram of a transportation tool provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0058] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0059] In order to facilitate understanding of the embodiments of the present application, the following explanation is made.

[0060] First, the terms "first", "second", etc. and various numbers in the text descriptions or drawings of the embodiments of the present application shown below are only used for the convenience of description, and are not necessarily used to describe a specific order or sequence, and are not used to limit the scope of the embodiments of the present application. For example, to distinguish between lens surfaces passing through different lenses or different lenses, etc.

[0061] Second, the terms "including" and "having" and any variations thereof in the embodiments of the present application shown below are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus 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 apparatuses.

[0062] Third, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions, and the embodiments or designs described as "exemplary" or "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. The use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way for easy understanding.

[0063] Fourth, in the embodiments of the present application, image light refers to light carrying an image (or image information). When the image light enters the projection lens, the projection lens can use the image light to project and generate an image.

[0064] Fifth, in the drawings of the present application, the thickness, size and shape of the lens have been slightly exaggerated for the sake of convenience. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example, that is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. Moreover, the drawings are only examples and are not drawn strictly to scale.

[0065] Sixth, in this application, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region.

[0066] Seventh, unless otherwise defined, all terms (including technical terms and scientific terms) used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having the same meaning as they have in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0067] Eighth, in the present application, the values ​​of the focal length, aperture and radius of some lenses are given. It should be understood that the different precision values ​​of these values ​​should also be within the protection scope of the present application. For example, the focal length of the ninth lens is f9 = -119.16mm, or the focal length of the ninth lens is f9 = -119.1638mm, both of which are within the protection scope of the present application. In addition, values ​​that are approximate to the values ​​listed in the present application should also be within the protection scope of the present application. Among them, approximate refers to the use of rounding or rounding up or down. For example, the focal length of the second lens f2 = 55.97mm, or the focal length of the second lens f2 = 56mm, are both within the protection scope of the present application.

[0068] Ninth, in this application, whether the surface of a lens is convex or concave is a relative definition, that is, in the embodiments of this application, the surface of the lens that curves toward the center of the lens is called a concave surface, and the surface of the lens that moves away from the center of the lens is called a convex surface. Figure 3 In the embodiment, the first surface 311 of the lens 31 is a surface that is curved toward the center point M of the lens, which is referred to as a concave surface in this application, and the second surface 312 of the lens 31 is a surface that is curved away from the center point M of the lens, which is referred to as a convex surface in this application. In some embodiments, the concave and convex definition of the surface shape may be different from that in the embodiment of this application, and this application does not limit it.

[0069] For ease of understanding, the technical terms involved in this application are first briefly explained and illustrated.

[0070] 1. Focal length, also known as focal length, is usually represented by f. It is a measurement method for measuring the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or a lens group to the focal plane when an infinitely distant scene forms a clear image on the focal plane through the lens or lens group. In the embodiments of the present application, the sign of the focal length is negative, and the negative sign is used to indicate that the corresponding optical power of the lens is negative. Among them, the positive and negative signs are defined as follows: along the optical axis direction of the lens, if the focal length of the lens is to the right of the lens vertex, the lens is a positive lens and the sign of the focal length is positive; if the focal length of the lens is to the left of the lens vertex, the lens is a negative lens and the sign of the focal length is negative.

[0071] 2. Aperture is a device used to control the amount of light that passes through the lens and reaches the photosensitive element. The aperture size is expressed in F number or F value.

[0072] 3. Aperture F value (F#) is the relative value of the focal length of the lens and the diameter of the lens, that is, the reciprocal of the relative aperture. The smaller the aperture F#, the more light enters in the same unit time; the larger the aperture F#, the smaller the depth of field, and the background content of the photo will be blurred.

[0073] 4. Positive focal length, also known as positive refractive power, means that the lens has a positive focal length and has the effect of converging light.

[0074] 5. Negative optical power, also known as negative refractive power, means that the lens has a negative focal length and has the effect of diverging light.

[0075] 6. Total track length (TTL) refers to the total length from the end of the optical lens away from the imaging surface to the imaging surface.

[0076] 7. Abbe number, also known as dispersion coefficient, is the difference ratio of the refractive index of optical materials at different wavelengths, representing the degree of dispersion of the material.

[0077] 8. The optical axis is a ray of light that passes vertically through the center of an ideal lens. When light parallel to the optical axis enters a convex lens, the ideal convex lens should have all the light rays converge at one point behind the lens. This point where all the light rays converge is the focus.

[0078] 9. Object side: With the optical lens as the boundary, the side where the scene to be imaged is located is the object side.

[0079] 10. Image side: With the optical lens as the boundary, the side where the image of the scene to be imaged is located is called the image side.

[0080] 11. Object side: the surface of the lens facing the object side is called the object side.

[0081] 12. Image side: The surface of the lens facing the image side is called the image side.

[0082] 13. Field of view angle refers to the angle formed by the two edges of the maximum range through which the image of the target can pass through the lens, with the lens of the optical instrument as the vertex.

[0083] 14. Back focal length (BFL) refers to the on-axis distance from the image plane of the projection lens to the image side of the nearest lens.

[0084] 15. Wedge prism, also known as wedge angle prism, is an optical device with an inclined surface, which is used for light beam control and can deflect the light beam to a certain angle. The inclination angles of the two sides of the wedge prism are relatively small, which can deflect the light path to the thicker side. For a wedge prism, the larger the wedge angle, the greater the deflection angle of the light beam incident on the prism.

[0085] Figure 1 A schematic diagram showing an application scenario of the projection lens provided in an embodiment of the present application is shown. Figure 1 As shown, the projection lens can be set on the car headlight to form an adaptive driving beam (ADB) system. The ADB system is used to determine the position and distance of the front vehicle through the input of the video camera signal, and adjust the lighting area accordingly, turn off or dim the lighting of the opposite vehicle area to avoid glare to the oncoming vehicle, while maximizing the driver's field of vision. In addition to realizing ADB, the projection lens can also project high-definition symbols and icons on the ground to improve driving safety, as well as project pictures and videos to achieve rich intelligent headlight interaction scenes.

[0086] At present, in order to realize the lighting patterning and pixel display of the car lighting system, the projection car lighting system is required to effectively take into account the comprehensive projection performance in the normal driving state and the near-field welcoming state. However, in the current projection system, there is a big difference between the near-field welcoming state and the normal driving state, and the projection optical performance of the two cannot be taken into account.

[0087] In view of this, the projection lens provided in the present application combines a wedge-shaped prism with a plurality of lenses each having optical focal length, and through reasonable allocation of the optical focal length, surface shape, center thickness of each lens, and axial spacing between each lens, the above-mentioned projection lens has at least one beneficial effect of a large field of view, a large aperture, and high imaging quality, while taking into account the optical performance in normal driving and near-field welcoming states.

[0088] Figure 2 FIG. 2 shows a schematic structural block diagram of a projection lens 200 provided in an embodiment of the present application. Figure 2 As shown, the projection lens 200 is viewed from the projection side (i.e. Figure 2A wedge prism P0 and a plurality of lenses (e.g., a first lens 21, a second lens 22 to an nth lens 2n) are sequentially placed from the object side (in the image) to the image side. Each of the plurality of lenses has a different optical focal length. The wedge prism P0 is used to change the optical path of the image light sequentially transmitted by the plurality of lenses. The projection lens 200 is used to receive the image light and generate an image corresponding to the image light based on the projection of the image light. Specifically, when the projection lens 200 is applied to an imaging system, the image light emitted by the projection chip 20 (or referred to as the display chip 20) is incident from the second surface of the lens closest to the projection chip among the plurality of lenses, and is sequentially projected toward the projection side until it is emitted from the first surface of the wedge prism P0 to generate a projection image.

[0089] It should be noted that the wedge prism P0 and the multiple lenses include a first surface and a second surface, wherein the first surface of the wedge prism P0 and each lens of the multiple lenses is the surface closest to the projection side (the orientation for generating the projected image), referred to as the object side surface corresponding to the prism P0 or the lens. The second surface of the prism P0 and each lens is the surface closest to the display chip, referred to as the image side surface corresponding to the prism P0 or the lens. Exemplarily, for the wedge prism P0 in the projection lens 200, the corresponding first surface and second surface are respectively the first surface P01 and the second surface P02. For another example, for the first lens 21 in the projection lens 200, the corresponding first surface and second surface are respectively the first surface 211 and the second surface 212.

[0090] In some embodiments, a cover glass G0 is further provided on the surface of the projection chip 20, and the cover glass G0 includes a first surface G01 and a second surface G02. The cover glass G0 is used to correct color deviation or to protect the projection chip 20 located at the imaging surface, for example, to isolate water stains, dust and prevent oxidation of chip materials.

[0091] For the projection lens 200 provided in the embodiment of the present application, it can cooperate with different types of projection chips 20 to form different imaging systems. For example, the projection chip 20 can be a liquid crystal on silicon (LCoS) modulator, which is a reflective spatial light modulator with the function of changing the polarization direction of incident linear polarized light. Alternatively, the projection chip 20 can be a reflective spatial light modulator that does not have the function of changing the polarization direction of incident linear polarized light, such as a micro-electro-mechanical system (MEMS) or a digital micro mirror device (DMD). In addition, the projection chip 20 can also be a transmissive spatial light modulator, such as a liquid crystal display (LCD).

[0092] Optionally, the material of the wedge prism P0 and the multiple lenses in the projection lens 200 provided in the embodiment of the present application is optical glass or optical plastic, etc., which is not limited in the present application.

[0093] Above Figure 2 This is only for the purpose of illustrating the relative positional relationship of each lens, wherein the surface shape of each lens of the multiple lenses may be a spherical surface, an aspherical surface or a free-form surface, etc., and this application does not limit this.

[0094] Based on the above Figure 2 Description, the following combination Figure 3 , Figure 7 , Fig.11 The first projection lens 300, the second projection lens 700 and the third projection lens 1100 provided in the embodiments of the present application are respectively described. Specifically, the first projection lens 300 includes a first wedge prism P1 and four lenses; the second projection lens 700 includes a second wedge prism P2 and five lenses; the third projection lens 1100 includes a third wedge prism P3 and seven lenses. It can be understood that the first wedge prism P1, the second wedge prism P2 and the third wedge prism P3 in the embodiments below are the above-mentioned lenses. Figure 2 An example of a wedge prism P0 is shown.

[0095] Figure 3 The schematic diagram of the structure of the optical imaging system 30 composed of the first projection lens 300 provided in the embodiment of the present application is shown. Specifically, the projection lens 300 includes a first wedge prism P1, a first lens 31, a second lens 32, a third lens 33 and a fourth lens 34. Among them, the wedge angle range of the first wedge prism P1 is 4.5° to 8.5°. For example, the wedge angle of the first wedge prism P1 can be 4.5°, 8.5° or any angle between 4.5° and 8.5°, for example, it can be 6°. The first lens 31 includes a first concave spherical surface 311 and a second convex spherical surface 312, and the first lens 31 has a negative optical focal length. The second lens 32 includes a first convex spherical surface 321 and a second convex spherical surface 322, and the second lens 32 has a positive optical focal length. The third lens 33 includes a first concave spherical surface 331 and a second convex spherical surface 332, and the optical focal length of the third lens 33 is negative. The fourth lens 34 includes a fourth convex spherical surface 341 and a second convex spherical surface 342 , and the optical power of the fourth lens 34 is positive.

[0096] The focal length of the first lens 31 is in the range of -982.1 mm<f1<-768.6 mm, the focal length of the second lens 32 is in the range of 50.4<f2<64.4 mm, the focal length of the third lens 33 is in the range of -80.5<f3<63 mm, and the focal length of the fourth lens 34 is in the range of 52 mm<f4<66.4 mm.

[0097] Illustratively, Table 1 shows relevant optical data of an optical imaging system formed by a first projection lens 300 provided in an embodiment of the present application.

[0098] Table 1

[0099]

[0100] The object plane represents the projection surface of the projection lens 300 , G01 and G02 are two surfaces of cover glass placed on the chip surface of the projection chip 20 , and the image plane is the chip surface of the projection chip 20 .

[0101] It should be noted that, in the embodiment of the present application, the absolute value of the radius of curvature R represents the magnitude of the radius of curvature of the corresponding surface, and the positive and negative signs represent the bending direction of the corresponding surface. When the center of the sphere corresponding to the radius of curvature is located on the left side of the vertex of the sphere, the sign of the radius of curvature of the sphere is negative, and when the center of the sphere corresponding to the radius of curvature is located on the right side of the vertex of the sphere, the sign of the radius of curvature of the sphere is positive. For example, in Figure 3 In the figure, the first surface 311 of the lens 31 is a sphere, the vertex of the sphere 311 is point O (the intersection of the optical axis and the sphere), the center of the sphere is point C (the optical axis passes through the center of the sphere), and the positive direction is defined as from left to right. The direction from the vertex of the sphere 311 to the center of the sphere (i.e., the direction of the line segment OC) is opposite to the positive direction, so the sign of the radius of curvature of the sphere 311 is negative.

[0102] It can be understood that the parameters in Table 1 above are ideal design parameters. For example, the radius of curvature is infinite. In actual processing, the processing error may cause a difference between the radius of curvature and the ideal radius of curvature.

[0103] exist Figure 3 In the projection lens 300 shown, the radius R1 of the first surface 311 of the first lens 31 satisfies: -25 mm<R1<-15 mm, and the radius R2 of the second surface 312 of the first lens 31 satisfies: -50 mm<R2<-15 mm.

[0104] In addition, the F# of the projection lens 300 satisfies: F#=1.3, the BFL of the projection lens 300 satisfies: BFL>38.06 mm, and the diameter D1 of the first lens 31 satisfies: 32 mm<D1<44 mm.

[0105] For example, Table 2 shows the relevant parameters of the first optical imaging system 30 provided in the embodiment of the present application. Including the effective focal length (f1-f4) of each lens, the effective focal length (EFL) of the optical imaging system 30, the TTL of the optical imaging system 30, half the diagonal length h of the effective pixel area on the imaging surface, the maximum field of view, the aperture number F of the optical imaging system 30 no , a back focal length BFL of the projection lens 300 (the distance between the second surface 342 of the fourth lens 34 and the image plane), and an aperture D1 of the first lens 31 .

[0106] Table 2

[0107]

[0108]

[0109] It is understandable that the values ​​in Table 1 and Table 2 are only examples and not limitations. As long as the effective focal lengths (f1-f4) of the above lenses are met, they should also be within the protection scope of the present application.

[0110] Based on the system design parameters shown in Table 2, through the mutual cooperation of the four lenses, the lens with positive focal length can converge the incident light, and the lens with negative focal length can expand the light beam, which can increase the projection distance without losing light and achieve the characteristics of large field angle and large aperture. At the same time, each lens has a different focal length, which ensures that each lens bears a part of the optical effect and has a good effect of adjusting optical aberrations.

[0111] Figure 4 3 shows a diagram of spherical chromatic aberration of projection lens 300. Figure 4 In FIG. 1 , different types of curves represent the axial chromatic aberration values ​​of light of different wavelengths (including red light with a central wavelength of 620.00 nm, green light with a central wavelength of 550.00 nm, and blue light with a central wavelength of 450.00 nm) passing through the projection lens 300. The vertical axis represents the normalized aperture, and the horizontal axis represents the spherical chromatic aberration value, in millimeters (mm). Figure 4 It can be seen that light of different wavelengths passes through Figure 3 After the projection lens 300 is shown, the spherical chromatic aberration is good, so the projection lens 300 can achieve good imaging quality.

[0112] Figure 5 3 shows a field curvature diagram of projection lens 300. Figure 5In the figure, the field curvatures of the meridional image plane and the sagittal image plane corresponding to three different wavelengths of light (including red light with a central wavelength of 620.00nm, green light with a central wavelength of 550.00nm, and blue light with a central wavelength of 450.00nm) are shown respectively. Among them, the field curvature value of the meridional image plane is the distance measured on the tangent plane. The field curvature value of the sagittal plane is the distance measured on the plane orthogonal to the tangent plane. The vertical axis represents different image heights (also called field of view heights or field of view angles), in degrees (°). The horizontal axis represents the focal length, in mm. According to Figure 4 It can be seen that Figure 3 The projection lens 300 shown has small field curvature values ​​at three different wavelengths and can achieve good imaging quality.

[0113] Figure 6 3 shows a distortion diagram of the projection lens 300. Figure 6 In the figure, the distortion size corresponding to three different wavelengths (including red light with a central wavelength of 620.00nm, green light with a central wavelength of 550.00nm, and blue light with a central wavelength of 450.00nm) is shown. The vertical axis represents different image heights in degrees. The horizontal axis represents the distortion percentage in %, that is, the ratio between the actual image and the ideal image. According to Figure 6 It can be seen that Figure 3 The distortions of the projection lens 300 shown at three different wavelengths are very close and the distortion values ​​are small, so good imaging quality can be achieved.

[0114] Figure 7 The schematic diagram of the structure of the optical imaging system 70 composed of the second projection lens 700 provided in the embodiment of the present application is shown. Specifically, the projection lens 700 includes a second wedge prism P2, a first lens 71, a second lens 72, a third lens 73, a fourth lens 74 and a fifth lens 75. Among them, the wedge angle range of the second wedge prism P2 is 4.5° to 8.5°. For example, the wedge angle of the second wedge prism P2 can be 4.5°, 8.5° or any angle between 4.5° and 8.5°. The first lens 71 includes a first convex spherical surface 711 and a second concave spherical surface 712, and the first lens 71 has positive optical power. The second lens 72 includes a first concave spherical surface 721 and a second concave spherical surface 722, and the second lens 72 has negative optical power. The third lens 73 includes a first convex spherical surface 731 and a second convex spherical surface 732, and the optical power of the third lens 73 is positive. The fourth lens 74 includes a fourth convex spherical surface 741 and a second convex spherical surface 742, and the optical power of the fourth lens 74 is positive. The fifth lens 75 includes a first concave spherical surface 751 and a second convex spherical surface 752, and the fifth lens 75 has negative optical power.

[0115] Among them, the focal length range of the first lens 71 is 60.82mm<f1<79.58mm, the focal length range of the second lens 72 is -42.3mm<f2<-33.10mm, the focal length range of the third lens 73 is 43.1mm<f3<54.9mm, the focal length range of the fourth lens 74 is 57.8mm<f4<73.8mm, and the focal length range of the fifth lens 75 is -135.0mm<f5<-104.8mm.

[0116] Illustratively, Table 3 shows relevant optical data of the optical imaging system formed by the second projection lens 700 provided in an embodiment of the present application.

[0117] Table 3

[0118]

[0119] Among them, for the description of G01 and G02 and the curvature radius in Table 3, please refer to the relevant parts in the above Table 1, and no further details will be given here.

[0120] exist Figure 7 In the projection lens 700 shown, the radius R1 of the first surface 711 of the first lens 71 satisfies: 40 mm<R1<60 mm, and the radius R2 of the second surface 712 of the first lens 71 satisfies: 150 mm<R2<600 mm.

[0121] In addition, the F# of the projection lens 700 satisfies: F#=1.30, the BFL of the projection lens 700 satisfies: BFL>38.06, and the aperture D1 of the first lens 31 satisfies: 36 mm<D1<44 mm.

[0122] For example, Table 4 shows the relevant parameters of the second optical imaging system 70 provided in the embodiment of the present application. Including the effective focal length of each lens (f1-f5), the EFL of the optical imaging system 70, the TTL of the optical imaging system 70, h on the imaging plane, the maximum field of view, and the aperture number F of the optical imaging system 70. no , the back focal length BFL of the projection lens 700 (the distance between the second surface 752 of the fifth lens 75 and the image plane), and the aperture D1 of the first lens 71.

[0123] Table 4

[0124] fl(mm) 70.25 EFL(mm) 50.7 f2(mm) -37.79 TTL(mm) 95.5 f3(mm) 48.964 h(mm) 6.9831 f4(mm) 65.9 Maximum FOV(°) 14 f5(mm) -119.16 <![CDATA[F no ]]> 1.30 D1(mm) 40 BFL(mm) 38.0453

[0125] It is understandable that the values ​​in Table 3 and Table 4 are only examples and not limitations. As long as the effective focal lengths (f1-f5) of the above lenses are met, they should also be within the protection scope of the present application.

[0126] Based on the system design parameters shown in Table 4, the characteristics of large field angle and large aperture are achieved through the mutual cooperation of 5 lenses with different optical powers. At the same time, it has a good effect of adjusting optical aberrations.

[0127] Figure 8 700 is a spherical aberration diagram. Figure 8 It can be seen that Figure 7 The projection lens 700 shown in the figure has good performance in spherical chromatic aberration for light of three wavelengths (including red light with a central wavelength of 620.00 nm, green light with a central wavelength of 550.00 nm, and blue light with a central wavelength of 450.00 nm), and can achieve good imaging quality.

[0128] Fig. 9 700 is a diagram showing the field curvature of the projection lens 700. Fig. 9 It can be seen that Figure 7 The projection lens 700 shown has small field curvature values ​​under three wavelengths of light (including red light with a central wavelength of 620.00 nm, green light with a central wavelength of 550.00 nm, and blue light with a central wavelength of 450.00 nm), and can achieve good imaging quality.

[0129] Fig.10 700 is a distortion diagram of the projection lens 700. Fig.10 It can be seen that Figure 7 The projection lens 700 shown has similar and small distortion under three wavelengths of light (including red light with a central wavelength of 620.00 nm, green light with a central wavelength of 550.00 nm, and blue light with a central wavelength of 450.00 nm), and can achieve good imaging quality.

[0130] Fig.11The schematic diagram of the structure of the optical imaging system 110 composed of the third projection lens 1100 provided in the embodiment of the present application is shown. Specifically, the projection lens 1100 includes a first wedge prism P3, a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, a sixth lens 116 and a seventh lens 117. Among them, the wedge angle range of the second wedge prism P2 is 4.5° to 8.5°. For example, the wedge angle of the second wedge prism P2 can be 4.5°, 8.5° or any angle between 4.5° and 8.5°. The first lens 111 includes a first convex spherical surface 1111 and a second convex spherical surface 1112, and the first lens 111 has a positive optical focal length. The second lens 112 includes a first convex spherical surface 1121 and a second concave spherical surface 1122, and the second lens 112 has a negative optical focal length. The third lens 113 includes a first concave spherical surface 1131 and a second convex spherical surface 1132, and the optical power of the third lens 113 is negative. The fourth lens 114 includes a fourth convex spherical surface 1141 and a second concave spherical surface 1142, and the optical power of the fourth lens 114 is negative. The fifth lens 115 includes a first convex spherical surface 1151 and a second convex spherical surface 1152, and the fifth lens 115 has positive optical power. The sixth lens 116 includes a first convex spherical surface 1161 and a second convex spherical surface 1162, and the optical power of the sixth lens 116 is positive. The seventh lens 117 includes a first concave spherical surface 1171 and a second convex spherical surface 1172, and the optical power of the seventh lens 117 is negative.

[0131] Among them, the focal length range of the first lens 111 is 112.7mm<f1<139.3mm, the focal length range of the second lens 112 is -54.5mm<f2<-44.1mm, the focal length range of the third lens 113 is -1342mm<f3<-1220mm, the focal length range of the fourth lens 114 is -70.62mm<f4<-57.14mm, the focal length range of the fifth lens 115 is 39.5mm<f5<48.8mm, the focal length range of the sixth lens 116 is 32.5mm<f6<40.2mm, and the focal length of the seventh lens 117 is -132.0mm<f7<-106.8mm.

[0132] Illustratively, Table 5 shows relevant optical data of an optical imaging system formed by the third projection lens 1100 provided in an embodiment of the present application.

[0133] Table 5

[0134]

[0135]

[0136] Among them, for the description of G01 and G02 and the curvature radius in Table 3, please refer to the relevant parts in the above Table 1, and no further details will be given here.

[0137] exist Fig.11 In the projection lens 1100 shown, the radius R1 of the first surface 1111 of the first lens 111 satisfies: 80 mm < R1 ≤ 109.98 mm, and the radius R2 of the second surface 312 of the first lens 111 satisfies: 53.7 mm ≤ R2 < ∞.

[0138] In addition, the F# of the projection lens 300 satisfies: F#=1.3, the BFL of the projection lens 1100 satisfies: BFL>38.06, and the aperture D1 of the first lens 111 satisfies: 18 mm<D1<22 mm.

[0139] For example, Table 6 shows the relevant parameters of the third optical imaging system 110 provided in the embodiment of the present application, including the effective focal length of each lens (f1-f7), the EFL of the optical imaging system 110, the TTL of the optical imaging system 110, h on the imaging plane, the maximum field of view, and the aperture number F of the optical imaging system 110. no , the back focal length BFL of the projection lens 1100 (the distance between the second surface 1172 of the seventh lens 117 and the image plane), and the aperture D1 of the first lens 111.

[0140] Table 6

[0141] f1(mm) 126.6 EFL(mm) 24.29 f2(mm) -49.6 TTL(mm) 105.262 f3(mm) -1220 h(mm) 6.9831 f4(mm) -64.2 Maximum FOV(°) 32 f5(mm) 44.4 <![CDATA[F no ]]> 1.29 f6(mm) 36.55 BFL(mm) 38.45 f7(mm) -120 D1(mm) 20

[0142] It is understandable that the values ​​in Table 5 and Table 6 are only examples and not limitations. As long as the effective focal lengths (f1-f7) of the above lenses are met, they should also be within the protection scope of the present application.

[0143] Based on the system design parameters shown in Table 6, the characteristics of large field angle and large aperture are achieved through the mutual cooperation of 7 lenses with different optical powers. At the same time, it has a good effect of adjusting optical aberrations.

[0144] Fig.12 1 shows a spherical chromatic aberration diagram of the projection lens 1100. Fig.12 It can be seen that Fig.11 The projection lens 1100 shown in the figure has good performance in spherical chromatic aberration for light of three wavelengths (including red light with a central wavelength of 620.00 nm, green light with a central wavelength of 550.00 nm, and blue light with a central wavelength of 450.00 nm), and can achieve good imaging quality.

[0145] Fig.13 1100 shows a field curvature diagram of the projection lens 1100. Fig.13 It can be seen that Fig.11The projection lens 1100 shown has a small field curvature value under green light with a central wavelength of 550.00 nm, and can achieve good imaging quality.

[0146] Fig.14 1 shows a distortion diagram of the projection lens 1100. Fig.14 It can be seen that Fig.11 The projection lens 1100 shown has small distortion under green light with a central wavelength of 550.00 nm and can achieve good imaging quality.

[0147] It should be noted that in the above Figure 3 , Figure 7 and Fig.11 In the first projection lens 300, the second projection lens 700, and the third projection lens 1100 provided respectively, the surface of the multiple lenses of each projection lens is a spherical surface. In order to improve the imaging effect, in some embodiments, at least one surface of at least one lens of the multiple lenses in each projection lens can be designed as an aspherical surface, which is not limited in the present application.

[0148] Fig.15 FIG. 1 is a schematic diagram showing the structure of a projection device 1500 provided in an embodiment of the present application. Fig.15 As shown, the projection device 1500 includes: a display unit 1510 and a projection lens 1520. The display unit 1510 is used to generate image light and emit the image light to the projection lens 1520.

[0149] Exemplarily, the display unit 1510 may be an LCoS modulator, or a MEMS modulator, or a DMD modulator, or the display unit 1510 may also be an LCD, etc.

[0150] The description of the projection lens 1520 may refer to the above description and will not be repeated here.

[0151] Fig.16 FIG. 1 shows a schematic structural diagram of a vehicle lamp 1600 provided in an embodiment of the present application. Fig.16 As shown, the vehicle lamp 1600 includes: an illumination unit 1610 and a projection device 1500 . The illumination unit 1610 is used to generate a light beam carrying image light and project the light beam to the display unit 1510 of the projection device 1500 .

[0152] It should be noted that the lighting unit 1610 may be a light source for providing vehicle lighting.

[0153] When the display unit 1510 of the projection device 1500 is a DMD, Fig.17 FIG. 1 shows a schematic diagram of the structure of a vehicle light system 1700 provided in an embodiment of the present application. Fig.17The system shown includes an illumination unit 1710 , a refraction unit 1720 , a display unit 1730 and a projection lens 1740 .

[0154] The lighting unit 1710 includes a first monochromatic light array 1711, a second monochromatic light array 1712, a third monochromatic light array 1713, dichroic filters 1721 and 1722, and a lens group 1733. The three monochromatic light arrays can correspond to monochromatic light of three primary colors, including red light, blue light, and green light. In order to improve the utilization rate of light energy, in some embodiments, a collimating lens is arranged behind the monochromatic light array, such as Fig.17 The collimating lens 17111, the collimating lens 17112 and the collimating lens 17113 in the image processing apparatus are shown in FIG. 171. The refractive unit 1720 is a prism (or a prism group). Specifically, when it is necessary to use the car lights for projection, the first monochromatic light array 1711, the second monochromatic light array 1712 and the third monochromatic light array 1713 respectively emit corresponding monochromatic lights, and the three monochromatic lights are incident on the lens group 1733 through the dichroic filters 1721 and 1722. After being emitted from the lens group 1733, they are incident on the DMD 1730 through the prism 1720. The DMD 1730 modulates the input light beam based on the data information of the input image and outputs image light. The image light is incident on the projection lens 1740 after transmitting through the prism 1720, and is projected by the projection lens 1740 to generate the corresponding image. The structure of the projection lens 1740 can refer to the above Figure 2 , Figure 3 , Figure 7 or Fig.11 The relevant instructions in will not be repeated here.

[0155] Fig.18 FIG. 1 shows a circuit diagram of a projection device provided by an embodiment of the present application. Fig.18 As shown, the circuit in the projection device mainly includes a host CPU 3101, an external memory interface 3102, an internal memory 3103, an audio module 3104, a video module 3105, a power module 3106, a wireless communication module 3107, an I / O interface 3108, a video interface 3109, a display circuit 3110 and a modulator 3111. The host CPU 3101 and its peripheral components, such as the external memory interface 3102, the internal memory 3103, the audio module 3104, the video module 3105, the power module 3106, the wireless communication module 3107, the I / O interface 3108, the video interface 3109, and the display circuit 3110, can be connected via a bus. The host CPU 3101 can be called a front-end processor.

[0156] In addition, the circuit diagrams shown in the embodiments of the present application do not constitute specific limitations on the projection device. In other embodiments of the present application, the projection device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0157] The main processor 3101 includes one or more processing units, for example, the main processor 3101 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processor (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0158] A memory may also be provided in the main processor 3101 for storing instructions and data. In some embodiments, the memory in the main processor 3101 is a cache memory. The memory may store instructions or data that the main processor 3101 has just used or circulated. If the main processor 3101 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the main processor 3101, and thus improves the efficiency of the system.

[0159] In some embodiments, the projection device may further include a plurality of input / output (I / O) interfaces 3108 connected to the main processor 3101. The interface 3108 may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, a controller area network (CAN) interface, etc. The I / O interface 3108 may be connected to devices such as a mouse, touchpad, keyboard, camera, speaker, microphone, etc., and may also be connected to physical buttons on the projection device (such as volume buttons, brightness adjustment buttons, power buttons, etc.).

[0160] The external memory interface 3102 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the projection device. The external memory card communicates with the main processor 3101 through the external memory interface 3102 to implement a data storage function.

[0161] The internal memory 3103 can be used to store computer executable program codes, which include instructions. The internal memory 3103 may include a program storage area and a data storage area. The program storage area may store an operating system, an application required for at least one function (such as a time setting function, etc.), etc. The data storage area may store data created during the use of the projection device (such as world time, etc.), etc. In addition, the internal memory 3103 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (Universal Flash Storage, UFS), etc. The main processor 3101 executes various functional applications and data processing of the projection device by running instructions stored in the internal memory 3103 and / or instructions stored in a memory provided in the main processor 3101.

[0162] The projection device can realize audio functions such as music playback through the audio module 3104 and the application processor.

[0163] The audio module 3104 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signal. The audio module 3104 can also be used to encode and decode audio signals, such as playing or recording. In some embodiments, the audio module 3104 can be arranged in the main processor 3101, or some functional modules of the audio module 3104 can be arranged in the main processor 3101.

[0164] The video interface 3109 can receive external audio and video signals, which can be specifically a high-definition multimedia interface (HDMI), a digital video interface (DVI), a video graphics array (VGA), a display port (DP), etc. The video interface 3109 can also output video to the outside.

[0165] The video module 3105 can decode the video input by the video interface 3109 , for example, perform H.264 decoding. In addition, the main processor 3101 can also decode the video input by the video interface 3109 , and then output the decoded image signal to the display circuit 3110 .

[0166] The display circuit 3110 and the modulator 3111 are used to display the corresponding image. In this embodiment, the video interface 3109 receives the external input video source signal, and the video module 3105 decodes and / or digitally processes and outputs one or more image signals to the display circuit 3110. The display circuit 3110 drives the modulator 3111 to image the incident light beam according to the input image signal, and then outputs at least two imaging lights. In addition, the main processor 3101 can also output one or more image signals to the display circuit 3110.

[0167] In this embodiment, the display circuit 3110 and the modulator 3111 belong to Fig.15 The electronic components in the display unit 1510 shown, the display circuit 3110 can be called a driving circuit.

[0168] The power module 3106 is used to provide power to the main processor 3101 and the light source 3100 according to the input power (such as direct current), and the power module 3106 may include a rechargeable battery, which can provide power to the main processor 3101 and the light source 3100. The light emitted by the light source 3100 can be transmitted to the modulator 3111 for imaging, thereby forming an image light signal.

[0169] The wireless communication module 3107 can enable the projection device to communicate wirelessly with the outside world, and can provide wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) network), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication technology (NFC), infrared technology (IR) and other wireless communication solutions. The wireless communication module 3107 can be one or more devices integrating at least one communication processing module. The wireless communication module 3107 receives electromagnetic waves via an antenna, modulates the frequency of the electromagnetic wave signal and performs filtering, and sends the processed signal to the main processor 3101. The wireless communication module 3107 can also receive the signal to be sent from the main processor 3101, modulate the frequency of the signal, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0170] In addition, in addition to being input through the video interface 3109, the video data decoded by the video module 3105 can also be wirelessly received through the wireless communication module 3107 or read from an external memory. For example, the projection device can receive video data from a terminal device or an in-vehicle entertainment system through the wireless LAN in the car, and the projection device can also read audio and video data stored in an external memory.

[0171] The above projection device can be installed on vehicles, see Fig.19 , Fig.19 A possible functional framework schematic diagram of a transportation tool provided in an embodiment of the present application is shown.

[0172] like Fig.19As shown, the functional framework of the vehicle may include various subsystems, such as the sensor system 12, the control system 14, one or more peripheral devices 16 (one is shown as an example), the power supply 18, the computer system 20 and the display system 22. Optionally, the vehicle may also include other functional systems, such as an engine system that provides power for the vehicle, etc., which is not limited in this application.

[0173] The sensor system 12 may include a number of detection devices, which can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to a certain rule. As shown in the figure, these detection devices may include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a radar unit, a laser rangefinder, a camera device, a wheel speed sensor, a steering sensor, a gear position sensor, or other components for automatic detection, etc., and the present application does not limit them.

[0174] The control system 14 may include several components, such as the steering unit, brake unit, lighting system, automatic driving system, map navigation system, network timing system and obstacle avoidance system shown in the figure. Optionally, the control system 14 may also include components such as a throttle controller and an engine controller for controlling the vehicle's speed, which are not limited in this application.

[0175] The peripheral device 16 may include several components, such as the communication system, touch screen, user interface, microphone, and speaker shown in the figure. The communication system is used to realize network communication between the vehicle and other devices other than the vehicle. In practical applications, the communication system may use wireless communication technology or wired communication technology to realize network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through network cables or optical fibers.

[0176] The power source 18 represents a system that provides power or energy for the vehicle, which may include but is not limited to a rechargeable lithium battery or a lead-acid battery, etc. In practical applications, one or more battery components in the power source are used to provide power or energy for starting the vehicle, and the type and material of the power source are not limited in this application.

[0177] Several functions of the vehicle are controlled and implemented by the computer system 20. The computer system 20 may include one or more processors 2001 (one processor is shown as an example) and a memory 2002 (also referred to as a storage device). In actual applications, the memory 2002 is also inside the computer system 20, or it may be outside the computer system 20, for example, as a cache in the vehicle, etc., which is not limited in this application.

[0178] The processor 2001 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2001 may be used to run related programs or instructions corresponding to the programs stored in the memory 2002 to implement corresponding functions of the vehicle.

[0179] The memory 2002 may include a volatile memory, such as a RAM; the memory may also include a non-volatile memory, such as a ROM, a flash memory, a HDD or a solid-state drive SSD; the memory 2002 may also include a combination of the above-mentioned types of memory. The memory 2002 may be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2001 calls the program codes or instructions stored in the memory 2002 to implement the corresponding functions of the vehicle. In the present application, a set of program codes for vehicle control may be stored in the memory 2002, and the processor 2001 calls the program codes to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is described in detail below in the present application.

[0180] Optionally, in addition to storing program codes or instructions, the memory 2002 may also store information such as road maps, driving routes, sensor data, etc. The computer system 20 may be combined with other elements in the vehicle functional framework diagram, such as sensors in the sensor system, GPS, etc., to implement relevant functions of the vehicle. For example, the computer system 20 may control the driving direction or driving speed of the vehicle based on the data input from the sensor system 12, which is not limited in this application.

[0181] The display system 22 can display image information, such as displaying and playing videos.

[0182] Among them, this application Fig.19 The four subsystems shown are sensor system 12, control system 14, computer system 20 and display system 22, which are only examples and not limiting. In practical applications, vehicles can combine several components in the vehicle according to different functions to obtain subsystems with corresponding different functions. In practical applications, vehicles can include more or fewer systems or components, which is not limited in this application.

[0183] The above-mentioned means of transportation may be a car, a truck, a motorcycle, a bus, an entertainment vehicle, an amusement park vehicle, a tram, a golf cart, a trolley, etc., and the embodiments of the present application do not make any special limitations.

[0184] Unless otherwise defined, technical or scientific terms used herein shall have the common meanings understood by one of ordinary skill in the art to which the present disclosure belongs.

[0185] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the present application shall be included in the protection scope of the present application.

Claims

1. A projection lens, characterized in that: The projection lens comprises a wedge-shaped prism and a plurality of lenses sequentially arranged from the object side to the image side, wherein the projection lens is used to receive image light and generate an image corresponding to the image light based on the projection of the image light; The multiple lenses transmit the image light in sequence, and the multiple lenses have different optical powers; The wedge-shaped prism is used to change the optical path of the image light sequentially transmitted by the multiple lenses, and the wedge angle of the wedge-shaped prism ranges from 4.5° to 8.5°.

2. The projection lens according to claim 1, characterized in that: The aperture F value of the projection lens satisfies: F#≥1.

3.

3. The projection lens according to claim 1 or 2, characterized in that: The back focal length BFL of the projection lens satisfies: BFL>38mm.

4. The projection lens according to any one of claims 1 to 3, characterized in that: The field of view FOV of the lens satisfies: FOV≥14°.

5. The projection lens according to any one of claims 1 to 4, characterized in that: The plurality of lenses include a first lens, a second lens, a third lens and a fourth lens arranged in sequence from the object side to the image side, The optical power of the first lens is negative; The optical power of the second lens is positive; The optical power of the third lens is negative; The refractive power of the fourth lens is positive.

6. The projection lens according to claim 5, characterized in that: The radius R1 of the first surface of the first lens satisfies: -25 mm<R1<-15 mm, and the radius R2 of the second surface of the first lens satisfies: -50 mm<R2<-15 mm.

7. The projection lens according to claim 5 or 6, characterized in that: The focal length range of the first lens is -982.1mm<f1<-768.6mm, the focal length range of the second lens is 50.4<f2<64.4mm, the focal length range of the third lens is -80.5<f3<63mm, and the focal length range of the fourth lens is 52mm<f4<66.4mm.

8. The projection lens according to any one of claims 5 to 7, characterized in that: The aperture D1 of the first lens satisfies: 32 mm<D1<44 mm.

9. The projection lens according to any one of claims 1 to 4, characterized in that: The plurality of lenses include a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence from the object side to the image side, The optical power of the fifth lens is positive; The optical power of the sixth lens is negative; The optical power of the seventh lens is positive; The optical power of the eighth lens is positive; The ninth lens has negative refractive power.

10. The projection lens according to claim 9, characterized in that: The radius R1 of the first surface of the fifth lens satisfies: 40 mm<R1<60 mm, and the radius R2 of the second surface of the fifth lens satisfies: 150 mm<R2<600 mm.

11. The projection lens according to claim 9 or 10, characterized in that: The focal length range of the fifth lens is 60.82mm<f5<79.58mm, the focal length range of the sixth lens is -42.3mm<f6<-33.10mm, the focal length range of the seventh lens is 43.1mm<f7<54.9mm, the focal length range of the eighth lens is 57.8mm<f8<73.8mm, and the focal length range of the ninth lens is -135.0mm<f9<-104.8mm.

12. The projection lens according to any one of claims 9 to 11, characterized in that: The aperture D5 of the fifth lens satisfies: 36mm<D5<44mm.

13. The projection lens according to any one of claims 1 to 4, characterized in that: The plurality of lenses include a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens and a sixteenth lens arranged in sequence from the object side to the image side, The optical power of the tenth lens is positive; The optical power of the eleventh lens is negative; The optical power of the twelfth lens is negative; The refractive power of the thirteenth lens is negative; The optical power of the fourteenth lens is positive; The refractive power of the fifteenth lens is positive; The optical power of the sixteenth lens is negative.

14. The projection lens according to claim 13, characterized in that: The radius R1 of the first surface of the tenth lens satisfies: 80 mm<R1≤109.98 mm, and the radius R2 of the second surface of the tenth lens satisfies: 53.7 mm≤R2<∞.

15. The projection lens according to claim 13 or 14, characterized in that: The focal length range of the tenth lens is 112.7mm<f10<139.3mm, the focal length range of the eleventh lens is -54.5mm<f11<-44.1mm, the focal length range of the twelfth lens is -1342mm<f12<-1220mm, the focal length range of the thirteenth lens is -70.62mm<f13<-57.14mm, the focal length range of the fourteenth lens is 39.5mm<f14<48.8mm, the focal length range of the fifteenth lens is 32.5mm<f15<40.2mm, and the focal length range of the sixteenth lens is -132.0mm<f16<-106.8mm.

16. The projection lens according to any one of claims 13 to 15, characterized in that: The aperture D10 of the tenth lens satisfies: 18 mm<D10<22 mm.

17. The projection lens according to any one of claims 1 to 16, characterized in that: The surface shape of each lens of the plurality of lenses is spherical.

18. The projection lens according to any one of claims 1 to 17, characterized in that: The material of the multiple lenses is optical glass or optical plastic.

19. A projection device, characterized in that: include: A display unit and a projection lens as claimed in any one of claims 1 to 18, The display unit is used to generate the image light.

20. The projection device according to claim 19, characterized in that: The display unit is a liquid crystal on silicon (LCoS) chip or a digital micromirror device (DMD) chip.

21. A vehicle lamp, characterized in that: include: The projection device and lighting unit according to claim 19 or 20, The lighting unit is used to generate a light beam carrying the image light and project the light beam to the display unit.

22. A means of transport, characterized in that: The vehicle comprises the vehicle lamp as claimed in claim 21.

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