Miniaturized large-target-surface projection lens

Abstract

The invention relates to a miniaturized large-target-surface projection lens. Comprising a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a seventh lens with positive focal power which are sequentially arranged in the direction of an optical axis. An eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and a thirteenth lens with positive focal power; the focal length and the total length of the miniaturized large-target-surface projection lens are reasonably set, so that the lens is small in size, high in resolution and large in image surface, meets the strict use requirements in the environment of-40 DEG C to 85 DEG C, and is high in mass production yield.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a miniaturized large-surface projection lens. Background Art

[0002] With the booming development of the new energy vehicle industry, the demand for in-vehicle entertainment systems is becoming increasingly diversified. Among them, projection equipment has attracted much attention because it can provide a large-screen viewing experience in a limited space. However, in the pursuit of miniaturization and large-surface projection, existing technologies face a series of challenges. Due to their large size, traditional projectors are difficult to adapt to the compact space layout inside the vehicle, which has become a major obstacle to their application in the automotive field. In addition, in complex usage environments such as high temperature, low temperature and vibration, the performance of traditional projectors is often greatly reduced, and the improvement of resolution also encounters bottlenecks. These factors together limit the effective application of traditional projectors in the vehicle space.

[0003] In order to overcome the size limitation, a number of smaller projectors have emerged on the market. These small projectors generally use projection lenses with aspherical lenses, which meet the basic requirements of clarity and TV distortion while maintaining a small size. However, the use of plastic aspherical lenses has brought new problems. Plastic lenses are prone to aging and wear, and are difficult to remove after being dirty. They are also not resistant to high temperature and high brightness environments. These problems seriously shorten the service life of the projector and limit its use conditions. In order to improve durability and optical performance, some small projectors have begun to try to use glass as the processing material for aspherical lenses. Although glass lenses have excellent durability and optical performance, their processing process places strict requirements on the thickness ratio of the lens and the ratio of the diameter to the thickness. This results in the thickness of the lens made of glass material needing to be more than doubled at the same diameter, which undoubtedly increases the production cost and manufacturing difficulty. In addition, when the precision requirements for the processing of glass aspherical surfaces are high, the restrictions on the shape of the lens will be further increased, which is not conducive to mass production.

[0004] In summary, miniaturization and large-scale projection lenses face many challenges under existing technologies, including the large size and limited performance of traditional projectors, the poor durability of plastic lenses for small projectors, and the difficulty and high cost of processing glass lenses. Therefore, it is particularly important to develop a projection lens that can meet the requirements of miniaturization, achieve large-scale projection, and have good durability and optical performance. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems and propose a miniaturized large-target projection lens, which has a small size, a large target surface, and a high resolution, while meeting the stringent usage requirements in an environment of -40°C to 85°C and having a high mass production yield.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a miniaturized large-target-surface projection lens, comprising a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and a thirteenth lens with positive focal power, which are sequentially arranged along an optical axis direction, wherein each lens is a glass spherical lens;

[0008] The miniaturized large-target-surface projection lens further includes an aperture, which is located between the sixth lens and the seventh lens, or between the seventh lens and the eighth lens;

[0009] In addition, the miniaturized large-surface projection lens also meets the following conditions:

[0010] 13.13≤f≤15.8;54≤OAL≤57

[0011] Wherein, f is the effective focal length of the miniaturized large-target projection lens, in mm; OAL is the on-axis distance from the object side of the first lens to the image side of the thirteenth lens, in mm.

[0012] Preferably, the first lens is a convex-planar lens or a convex-concave lens, the second lens is a convex-concave lens, the third lens is a convex-concave lens, the fourth lens is a biconvex lens or a plano-convex lens, the fifth lens is a biconcave lens, the sixth lens is a plano-convex lens or a convex-planar lens, the seventh lens is a biconvex lens, the eighth lens is a biconvex lens or a concave-convex lens, the ninth lens is a convex-concave lens, the tenth lens is a biconvex lens or a concave-convex lens, the eleventh lens is a biconcave lens, the twelfth lens is a biconvex lens, and the thirteenth lens is a biconvex lens. The miniaturized large-target-surface projection lens also satisfies the following conditions:

[0013] <![CDATA[56.10<f1<68.9]]> <![CDATA[23.37<R 11 <32.52]]> <![CDATA[66.01<R 12 <131.2]]> <![CDATA[-33.36<f2<-25.5]]> <![CDATA[17.05<R 21 <23.89]]> <![CDATA[8.18<R 22 <10.52]]> <![CDATA[-34.76<f3<-27.02]]> <![CDATA[22.02<R 31 <34.78]]> <![CDATA[10.02<R 32 <11.35]]> <![CDATA[24.25<f4<31.35]]> <![CDATA[34.86<R 41 <285.9]]> <![CDATA[-210.59<R 42 <-30.5]]> <![CDATA[-18.66<f5<-17.2]]> <![CDATA[-45.51<R 51 <-20.32]]> <![CDATA[10.12<R 52 <16.8]]> <![CDATA[35.3<f6<91.2]]> <![CDATA[45.52<R 61 <+∞]]> <![CDATA[-220.7<R 62 <-42.27]]> <![CDATA[18.7<f7<21.2]]> <![CDATA[-12.6<R 71 <107.9]]> <![CDATA[-∞<R 72 <-15.17]]> <![CDATA[33.1<f8<99.8]]> <![CDATA[-135.1<R 81 <25.95]]> <![CDATA[-49.7<R 82 <-14.01]]> <![CDATA[-39.5<f9<-19.2]]> <![CDATA[-216.6<R 91 <517.29]]> <![CDATA[19.42<R 92 <22.6]]> <![CDATA[15.05<f 10 <29.95]]> <![CDATA[-166.5<R 101 <187.9]]> <![CDATA[-17.2<R 102 <-9.01]]> <![CDATA[-11.6<f 11 <-8.01]]> <![CDATA[-13.53<R 111 <-8.9]]> <![CDATA[-9.96<R 112 <34.9]]> <![CDATA[19.23<f 12 <21.9]]> <![CDATA[24.28<R 121 <35.78]]> <![CDATA[-22.16<R 122 <-18.37]]> <![CDATA[24.5<f 13 <28.6]]> <![CDATA[42.93<R 131 <56.3]]> <![CDATA[-69.7<R 132 <-41.2]]>

[0014] Among them, f1~f 13 are the focal lengths of the first to thirteenth lenses, in mm; R 11 , R 21 , R 31 , R 41 , R 51 , R 61 , R 71 , R 81 , R 91 , R 101 , R 111 , R 121 , R131 are the curvature radii of the object side surfaces of the first to thirteenth lenses, in mm; R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 , R 102 , R 112 , R 122 , R 132 They are the curvature radii of the image side surfaces of the first to thirteenth lenses, respectively, in mm; “-” indicates that the direction is the negative direction.

[0015] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0016]

[0017] Where D is the entrance pupil diameter, in mm.

[0018] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0019]

[0020] Wherein, SD1 is the marginal ray height of the object side surface of the first lens, and SD13 is the marginal ray height of the image side surface of the thirteenth lens.

[0021] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0022] -1%≤DIST≤-0.5%, RI≥60%

[0023] Among them, FOV is the full field of view angle of the maximum field of view, DIST is the maximum optical distortion from the center to the edge of the field of view, and RI is the relative illumination of the miniaturized large-target projection lens on the image plane.

[0024] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0025] 6≤th4+th6+th11+th13≤11

[0026] Wherein, th4 is the middle thickness of the fourth lens, th6 is the middle thickness of the sixth lens, th11 is the middle thickness of the eleventh lens, and th13 is the middle thickness of the thirteenth lens, and the unit is mm.

[0027] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0028] 115≤abv10+abv12≤160

[0029] Wherein, abv10 is the Abbe number of the tenth lens, and abv12 is the Abbe number of the twelfth lens.

[0030] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0031]

[0032] Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens, and the unit is mm.

[0033] Preferably, the miniaturized large-target-surface projection lens further comprises a prism, and the prism is located between the thirteenth lens and the image plane.

[0034] Preferably, the miniaturized large-surface projection lens also meets the following conditions:

[0035] CRA≤2.0°, 20mm≤FFL≤30mm

[0036] Among them, CRA is the maximum incident angle of the miniaturized large-target projection lens on the image plane, and FFL is the axial distance from the image side surface of the thirteenth lens to the image plane.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The lens adopts thirteen pieces of spherical glass structure, which reduces the cost while ensuring the image quality. The lens structure is compact by reasonably distributing the optical focal length. The total length of the lens is within 57mm, ensuring a small size. The various aberrations are corrected by reasonably distributing the glass lens, improving the edge image quality, thereby improving the image quality. The maximum aperture can reach F1.95, which enables the lens to have a higher light output capacity. At the same time, the complementary materials are reasonably set so that the lens does not defocus in the environment of -40℃~+85℃, and the working performance is more stable. The minimum projection ratio can be 1.266, which can be adapted The 0.47" DMD chip with an Offset of 105% realizes a large target area of ​​Φ16mm, high pixels, good imaging quality, and can provide sufficient projection brightness and size. The projection picture is clear and sharp, meeting the resolution of 1080P, with high contrast and accurate color reproduction. Compared with the plastic aspheric surface and glass aspheric surface used in the projection lens of traditional projection equipment, the glass spherical surface used in the present invention not only ensures the advantages of automotive-grade high temperature resistance and vibration, but also ensures processability, and by converting a larger assembly tolerance into a smaller gluing tolerance, the processability of the assembly is improved, thereby greatly improving the mass production yield of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a miniaturized large-target-surface projection lens according to Embodiment 1 of the present invention;

[0040] Figure 2 The longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the miniaturized large-target-surface projection lens according to Example 1 of the present invention are shown;

[0041] Figure 3 This is the MTF diagram of the miniaturized large-target-surface projection lens of Example 1 of the present invention;

[0042] Figure 4 This is a schematic structural diagram of a miniaturized large-target-surface projection lens according to Embodiment 2 of the present invention;

[0043] Figure 5 The longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the miniaturized large-target-surface projection lens according to Embodiment 2 of the present invention are shown;

[0044] Figure 6 This is the MTF diagram of the miniaturized large-target-surface projection lens of Example 2 of the present invention;

[0045] Figure 7 This is a schematic structural diagram of a miniaturized large-target-surface projection lens according to Embodiment 3 of the present invention;

[0046] Figure 8 The longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the miniaturized large-target-surface projection lens according to Example 3 of the present invention are shown;

[0047] Fig. 9 This is the MTF diagram of the miniaturized large-target-surface projection lens of Example 3 of the present invention;

[0048] Fig.10 This is a schematic structural diagram of a miniaturized large-target-surface projection lens according to Embodiment 4 of the present invention;

[0049] Fig.11 The longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the miniaturized large-target-surface projection lens according to Embodiment 4 of the present invention are shown;

[0050] Fig.12 This is the MTF diagram of the miniaturized large-target-area projection lens according to Example 4 of the present invention.

[0051] Explanation of the accompanying reference numerals: L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, eighth lens; L9, ninth lens; L10, tenth lens; L11, eleventh lens; L12, twelfth lens; L13, thirteenth lens; L14, prism; STO, aperture; CG, protection glass; IMA, image plane. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] The miniaturized large-surface projection lens of this application effectively solves the shortcomings of traditional projectors in vehicle-mounted space, such as volume limitation and small target surface. The compact design enables the projection equipment to better adapt to the limited space in the vehicle, while the full-glass structure and large aperture ensure that high-quality projection effects can still be provided in harsh vehicle-mounted environments. This lens not only improves the performance of the vehicle-mounted entertainment system, but also brings consumers a more immersive and comfortable viewing experience.

[0055] A miniaturized large-target-surface projection lens, comprising a first lens L1 with positive power, a second lens L2 with negative power, a third lens L3 with negative power, a fourth lens L4 with positive power, a fifth lens L5 with negative power, a sixth lens L6 with positive power, a seventh lens L7 with positive power, an eighth lens L8 with positive power, a ninth lens L9 with negative power, a tenth lens L10 with positive power, an eleventh lens L11 with negative power, a twelfth lens L12 with positive power and a thirteenth lens L13 with positive power, which are sequentially arranged along an optical axis direction, wherein each lens is a glass spherical lens;

[0056] The miniaturized large-target-surface projection lens further includes a stop STO, which is located between the sixth lens L6 and the seventh lens L7, or between the seventh lens L7 and the eighth lens L8;

[0057] In addition, the miniaturized large-surface projection lens also meets the following conditions:

[0058] 13.13≤f≤15.8;54≤OAL≤57

[0059] Wherein, f is the effective focal length of the miniaturized large-target-surface projection lens, in mm; OAL is the on-axis distance from the object-side surface of the first lens L1 to the image-side surface of the thirteenth lens L13, in mm.

[0060] Among them, the first lens L1 with positive focal power provides sufficient light height for the edge field of view, which is beneficial to reduce the optical distortion at the edge and provide a solution for small front-end aperture; the second lens L2 with negative focal power can quickly compress the light height and cooperate with the first lens L1 to reduce the head size; the third lens L3 with negative focal power can share the focal power of the second lens L2, provide a deflection angle for the edge light, smooth the light, and reduce the field of view aberration; the fourth lens L4 with positive focal power has a higher light height on the convex surface, providing a certain field curvature compensation for the system, so that the MTF concentration of the optical system is very high; the fifth lens L5 with negative focal power forms a negative-positive lens combination with the fourth lens L4, so that most of the primary aberrations of different signs are cancelled by positive and negative, and finally obtains higher-order aberrations that are beneficial to the aberration balance of the system, thereby compensating for the residual aberrations of other components of the lens; the sixth lens L6 with positive focal power has a higher refractive index, which can well compress the length of the system and make the system compact and miniaturized; the seventh lens L7 with positive focal power is connected to the front The rear lens group can make the light near the aperture STO set near it smooth, which helps to reduce the sensitivity of the lens and improve the product yield and reliability; the eighth lens L8 with positive focal power has a large Abbe number, which can reduce the chromatic aberration introduced into the system; the ninth lens L9 with negative focal power has a small Abbe number, and the combination of positive and negative focal powers with the eighth lens L8 can reduce the chromatic aberration of the entire system; the tenth lens L10 with positive focal power is also made of high Abbe number material, which reduces the introduction of chromatic aberration and is compatible with the negative lens. The ninth lens L9 forms a chromatic aberration complementary relationship and a spherical aberration complementary relationship; the eleventh lens L11 with negative optical power and the twelfth lens L12 with positive optical power can form a double cemented lens, or form a triple cemented lens with the tenth lens L10, which can greatly reduce the overall chromatic aberration of the system, ensure the low level of axial chromatic aberration and vertical chromatic aberration, and achieve simultaneous clarity of monochromatic light and mixed color light; the thirteenth lens L13 with positive optical power has a higher refractive index and a flat surface, which is helpful to reduce spherical aberration and correct the incident angle of the principal light.

[0061] The aperture STO can be set between the sixth lens L6 and the seventh lens L7 or between the seventh lens L7 and the eighth lens L8. The aperture STO is used to divide the front and rear lens groups, that is, the object side lens of the aperture STO constitutes the front lens group, and the image side lens constitutes the rear lens group. The aperture STO is located in the middle of the lens, which helps to balance the upper and lower light of the edge field of view, ensure the edge brightness while reducing the main light angle of the lens, so that the lens can better match the projection light system.

[0062] In addition, f can be: 13.432, 15.615, 14.712, 13.993, 13.13, in mm. If the above conditional expression is met and the 0.47" DMD chip with Offset 105% is matched, the lens can have a wide viewing angle and can project the required frame at a short distance; if the upper limit of the range is exceeded, the lens angle is reduced and the frame is reduced; if the lower limit of the range is below the lower limit, the lens angle increases, and the lens needs to be designed more complexly, and the demand for miniaturization and low cost is not met. OAL can be: 55.6, 56, 56.2, 57, in mm. If the above conditional expression is met, the lens has a small volume and compact space, which meets the demand for miniaturization; if the upper limit is exceeded, the demand for miniaturization is not met; if the lower limit is below the lower limit, the lens space is compressed, which is not conducive to improving clarity, and the material is more expensive, which easily leads to excessive cost.

[0063] In one embodiment, the first lens L1 is a convex-planar lens or a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a convex-concave lens, the fourth lens L4 is a biconvex lens or a plano-convex lens, the fifth lens L5 is a biconcave lens, the sixth lens L6 is a plano-convex lens or a convex-planar lens, the seventh lens L7 is a biconvex lens, the eighth lens L8 is a biconvex lens or a concave-convex lens, the ninth lens L9 is a convex-concave lens, the tenth lens L10 is a biconvex lens or a concave-convex lens, the eleventh lens L11 is a biconcave lens, the twelfth lens L12 is a biconvex lens, and the thirteenth lens L13 is a biconvex lens. The miniaturized large-target-surface projection lens further satisfies the following conditions:

[0064] <![CDATA[56.10<f1<68.9]]> <![CDATA[23.37<R 11 <32.52]]> <![CDATA[66.01<R 12 <131.2]]> <![CDATA[-33.36<f2<-25.5]]> <![CDATA[17.05<R 21 <23.89]]> <![CDATA[8.18<R 22 <10.52]]> <![CDATA[-34.76<f3<-27.02]]> <![CDATA[22.02<R 31 <34.78]]> <![CDATA[10.02<R 32 <11.35]]> <![CDATA[24.25<f4<31.35]]> <![CDATA[34.86<R 41 <285.9]]> <![CDATA[-210.59<R 42 <-30.5]]> <![CDATA[-18.66<f5<-17.2]]> <![CDATA[-45.51<R 51 <-20.32]]> <![CDATA[10.12<R 52 <16.8]]> <![CDATA[35.3<f6<91.2]]> <![CDATA[45.52<R 61 <+∞]]> <![CDATA[-220.7<R 62 <-42.27]]> <![CDATA[18.7<f7<21.2]]> <![CDATA[-12.6<R 71 <107.9]]> <![CDATA[-∞<R 72 <-15.17]]> <![CDATA[33.1<f8<99.8]]> <![CDATA[-135.1<R 81 <25.95]]> <![CDATA[-49.7<R 82 <-14.01]]> <![CDATA[-39.5<f9<-19.2]]> <![CDATA[-216.6<R 91 <517.29]]> <![CDATA[19.42<R 92 <22.6]]> <![CDATA[15.05<f 10 <29.95]]> <![CDATA[-166.5<R 101 <187.9]]> <![CDATA[-17.2<R 102 <-9.01]]> <![CDATA[-11.6<f 11 <-8.01]]> <![CDATA[-13.53<R 111 <-8.9]]> <![CDATA[-9.96<R 112 <34.9]]> <![CDATA[19.23<f 12 <21.9]]> <![CDATA[24.28<R 121 <35.78]]> <![CDATA[-22.16<R 122 <-18.37 <!-- 5 -->]]> <![CDATA[24.5<f 13 <28.6]]> <![CDATA[42.93<R 131 <56.3]]> <![CDATA[-69.7<R 132 <-41.2]]>

[0065] Among them, f1~f 13 are the focal lengths of the first lens L1 to the thirteenth lens L13, in mm; R 11 , R 21 , R 31 , R 41 , R 51 , R 61 , R 71 , R 81 , R 91 , R 101 , R 111 , R 121 , R 131 are the curvature radii of the object side surfaces of the first lens L1 to the thirteenth lens L13, in mm; R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 , R 102 , R112 , R 122 , R 132 They are the curvature radii of the image-side surfaces of the first lens L1 to the thirteenth lens L13, in order, and the unit is mm; “-” indicates that the direction is the negative direction.

[0066] By reasonably limiting the focal length, shape and curvature radius of each lens, it is beneficial to achieve miniaturization and large target surface design of the projection lens and obtain good imaging quality.

[0067] In one embodiment, the miniaturized large-surface projection lens also meets the following conditions:

[0068]

[0069] Where D is the entrance pupil diameter, in mm.

[0070] Specifically, f / D can be: 1.98, 1.995, 2.019, 2.014, 2.03. Meeting the above conditional formula, the lens has a larger aperture, which can meet the needs of low-cost, low-light projection equipment, as well as high-light projection equipment, so that the lens has a wide range of use and meets the needs of most projection scenes on the market.

[0071] In one embodiment, the miniaturized large-surface projection lens also meets the following conditions:

[0072]

[0073] Wherein, SD1 is the marginal ray height of the object-side surface of the first lens L1, and SD13 is the marginal ray height of the image-side surface of the thirteenth lens L13.

[0074] Specifically, SD1 / SD13 can be: 1.057, 1.25, 1.191, 1.301, 1.202. When the above conditional formula is met, the aperture of the first lens L1 and the aperture of the thirteenth lens L13 are very close, so that the diameter of the head and tail of the structure can be basically the same, which is conducive to the overall miniaturization design of the projection, and also helps to reduce the exposed area of ​​the projection, improve the integration, reduce the discomfort of exposure, and improve the aesthetics of the projection equipment in the car space. If it exceeds the upper limit, the head size is too large, which reduces the aesthetics of the application; if it is below the lower limit, the head size is too small, the design is difficult, and more lenses are needed to compensate for the optical distortion caused by the small head, which is not conducive to cost reduction.

[0075] In one embodiment, the miniaturized large-surface projection lens also meets the following conditions:

[0076] -1%≤DIST≤-0.5%, RI≥60%

[0077] Among them, FOV is the full field of view angle of the maximum field of view, DIST is the maximum optical distortion from the center to the edge of the field of view, and RI is the relative illumination of the miniaturized large-target projection lens on the image plane IMA.

[0078] Specifically, FOV / DIST can be: -60.2, -71.3, -80.6, -79.2, -62.6, in units of ° / %. When the above conditional formula is met, in the case of wide-angle FOV, the maximum optical distortion can be controlled within a reasonable range, and it is more appropriate for full-glass compensation distortion, so that the FOV and DIST of the lens are within a reasonable range, ensuring low deformation of the projection size and frame. In addition, DIST can be: -0.88%, -0.76%, -0.6%, -0.65%, -0.55%. When the above conditional formula is met, the optical distortion of the lens is within a reasonable range. At this time, the distortion of the projection TV is less than 0.5%, and the human eye can hardly perceive the deformation of the picture, which helps to improve comfort; exceeding this range, the optical distortion is too large, and the deformation of the projection picture becomes larger, which may cause discomfort in observation. RI can be: 68%, 71%, 75%, 65%, 78%. Meeting the above conditional formula can ensure good illumination uniformity within the range of Offset 105%, and avoid dark corners caused by low illumination at the edges. If the range is exceeded, the relative illumination is too low, which is more likely to cause dark corners and affect the viewing comfort.

[0079] In one embodiment, the miniaturized large-surface projection lens also meets the following conditions:

[0080] 6≤th4+th6+th11+th13≤11

[0081] Wherein, th4 is the middle thickness of the fourth lens L4, th6 is the middle thickness of the sixth lens L6, th11 is the middle thickness of the eleventh lens L11, and th13 is the middle thickness of the thirteenth lens L13, and the unit is mm.

[0082] Specifically, th4+th6+th11+th13 can be: 9.29, 8.38, 7.6, 10.37, 7.2, 6.8, in mm. Due to the distribution of optical power, the fourth lens L4, the sixth lens L6, the eleventh lens L11 and the thirteenth lens L13 are often made of materials with a relatively high refractive index. Due to their own characteristics, the materials with a high refractive index have a low short-wave transmittance. In order to enhance the short-wave transmittance of the lens, the thickness of the high refractive index material must be strictly controlled. When the above conditional formula is met, the overall thickness of the high refractive index material can be controlled within a reasonable range to ensure that the difference between the short-wave transmittance and the long-wave transmittance of the lens is small, and the color temperature deviation problem is avoided; if the upper limit is exceeded, the fourth lens L4, the sixth lens L6, the eleventh lens L11 and the thirteenth lens L13 are too thick, which may easily cause the short-wave transmittance to be low, affecting the color temperature and brightness of the projection image; if the lower limit is exceeded, the lens thickness is too thin, which is not conducive to processing.

[0083] In one embodiment, the miniaturized large-surface projection lens also meets the following conditions:

[0084] 115≤abv10+abv12≤160

[0085] Wherein, abv10 is the Abbe number of the tenth lens L10, and abv12 is the Abbe number of the twelfth lens L12.

[0086] Specifically, abv10+abv12 can be: 135.62, 153.78, 147.94, 120.37, 155.32. The tenth lens L10 and the twelfth lens L12 are low refractive index and high Abbe number materials, and the material range is close to the negative dn / dt (refractive index temperature coefficient) material, satisfying the above conditional formula. The tenth lens L10 and the twelfth lens L12 select appropriate negative dn / dt materials to compensate for the expansion and contraction of the excessive back focus at high and low temperatures, so that the lens completes the optical athermal design, which can meet the vehicle-mounted temperature range of -40℃ to 85℃, and there is no plastic lens, that is, when the all-glass structure is adopted, the high temperature can cover up to 105℃. Beyond the limited range, the material selection does not meet the high and low temperature compensation requirements.

[0087] In one embodiment, the miniaturized large-surface projection lens satisfies the following conditional formula:

[0088]

[0089] Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0090] Specifically, f1 / (f2+f3) can be: -1.037, -0.97, -1.075, -1.23, -1.16. If the above conditional formula is met, the first lens L1, the second lens L2 and the third lens L3 are a positive-negative-negative combination, and the effective focal length is limited to a reasonable range. The positive-negative combination lens can be used to achieve a small aperture and low distortion effect, reduce the introduction of aberrations, improve overall clarity, and have high resolution. If the range is exceeded, the optical power is unevenly matched, and it is not easy to achieve a small head solution.

[0091] In one embodiment, the miniaturized large-surface projection lens system further includes a prism L14, and the prism L14 is located between the thirteenth lens L13 and the image plane IMA.

[0092] The prism L14 is an equivalent flat plate, which is used to aggregate light for different light source combinations, such as providing a suitable reflection angle and refraction angle for each light, which is a well-known technology for those skilled in the art and will not be described in detail here.

[0093] In one embodiment, the miniaturized large-surface projection lens also meets the following conditions:

[0094] CRA≤2.0°, 20mm≤FFL≤30mm

[0095] Among them, CRA is the maximum incident angle of the miniaturized large-target projection lens on the image plane IMA, and FFL is the axial distance from the eleventh lens L11 to the image plane IMA.

[0096] Specifically, CRA can be: 0.8, 1.7, 1.0, 1.5, 0.6, in degrees. If the above conditional formula is met, the telecentricity of the lens is controlled within a very small range, ensuring that the lens is aligned with the light output direction, improving the light output efficiency from the center to the edge of the picture, and avoiding uneven brightness; if it exceeds this range, the telecentricity is too large, which can easily cause low light output efficiency and affect the brightness and uniformity of the picture. In addition, FFL can be: 23.2, 20.5, 25.6, 27.83, 29.6, in mm. If the above conditional formula is met, the lens can match a larger back focus, and provide sufficient prism space and light output heat dissipation space to match more projection optical machines; if it exceeds the upper limit, the back focus is too large, increasing the difficulty and cost of lens design; if it is below the lower limit, the back focus is too small, which is not conducive to the arrangement of the lighting optical path and the heat dissipation of the optical machine, affecting the user experience.

[0097] For ease of understanding, the following is a detailed description through specific embodiments. The reference wavelength of the effective focal length, Abbe number, and refractive index in each embodiment is 520 nm.

[0098] Embodiment 1:

[0099] like Figure 1As shown, in this embodiment, the miniaturized large-target-surface projection lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a prism L14, a protective glass CG and a DMD chip (image plane IMA) arranged in sequence along the optical axis, wherein the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 form a triple cemented lens. The effective focal length of this optical system is f=15.61mm, the aperture number Fno=2.0, the maximum image plane is 16mm, and the axial distance OAL from the object side of the first lens L1 to the image side of the thirteenth lens L13 is 56mm; it can be seen that this optical system can achieve the effects of high resolution, miniaturization and large image plane.

[0100] Specifically, the values ​​of the parameters of the lens in this embodiment are as shown in Table 1 below:

[0101] Table 1

[0102] Surface number Surface type Curvature radius (mm) Thickness(mm) Refractive Index Abbe number OBJ Spherical unlimited 1182.000 S1 Spherical 27.815 3.768 1.618 63.39 S2 Spherical 106.137 0.154 S3 Spherical 23.796 3.059 1.589 61.25 S4 Spherical 8.802 3.696 S5 Spherical 34.665 1.123 1.487 70.44 S6 Spherical 11.305 3.162 S7 Spherical 263.918 1.670 1.923 20.88 S8 Spherical -30.951 0.303 S9 Spherical -21.324 1.117 1.497 81.61 S10 Spherical 16.798 2.000 S11 Spherical 48.520 1.285 2.001 29.13 S12 Spherical -156.319 0.860 STO(S13) Spherical unlimited 4.321 S14 Spherical 38.465 4.836 1.691 54.82 S15 Spherical -20.143 0.107 S16 Spherical -132.169 1.489 1.589 61.25 S17 Spherical -32.201 0.668 S18 Spherical 515.296 1.788 1.847 23.78 S19 Spherical 19.842 1.659 S20 Spherical 180.921 4.992 1.569 71.30 S21 Spherical -9.037 1.100 1.785 25.72 S22 Spherical 24.887 7.885 1.569 71.30 S23 Spherical -18.954 1.427 S24 Spherical 43.933 3.530 1.946 17.94 S25 Spherical -68.309 9.826 S26 Spherical unlimited 16.000 1.713 53.83 S27 Spherical unlimited 0.600 S28 Spherical unlimited 1.100 1.510 62.91 S29 Spherical unlimited 0.303 IMA Spherical unlimited 0.000

[0103] like Figure 1 As shown in the figure, the surface number OBJ represents the object surface, the surface numbers S1, S3, S5, S7, S9, S11, S14, S16, S18, S20, S21, S22, S24, S26 to S28 represent the object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the cover glass CG, and the surface numbers S2, S4, S6, S8, S10 , S12, S15, S17, S19, S21, S22, S23, S25, S27 to S29 represent the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the protective glass CG, respectively. The bonding surface of the bonding lens group is regarded as one surface. STO represents the aperture, that is, the surface number S13, and the surface number IMA represents the imaging surface (image surface) of the DMD chip. The DMD chip is a digital micromirror device (DMD, Digital Micromirror Device).

[0104] Figure 2The longitudinal spherical aberration diagram (LONGITUD INAL SPHERICAL ABER.) of the optical system indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram indicates the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa indicates the distance from the image plane to the intersection of the light and the optical axis (in mm). It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergent focus of light of each wavelength in this embodiment tends to be consistent, the diffuse spots or color halos in the imaging picture are effectively suppressed, and the difference between single wavelength and complex wavelength is small. Figure 2 It also includes the field curvature diagram of the optical system (ASTIGMATIC FIELD CURVES), where the S curve represents the sagittal field curvature at a wavelength of 520nm, and the T curve represents the meridian field curvature at a wavelength of 520nm. As can be seen from the figure, the field curvature of the optical system is small, and the field curvature and astigmatism of each field of view are well corrected. Figure 2 It also includes a distortion diagram (DISTORTION) of the optical system. It can be seen from the diagram that the image deformation caused by the main beam is small and the imaging quality of the system is excellent. Figure 3 The relationship between MTF and frequency under different fields of view is shown in the figure. The center and edge of the field of view have clear images at different frequencies, and the MTF of all fields of view is greater than 0.59 at the limit frequency of 93lp / mm. In summary, the longitudinal spherical aberration, field curvature and distortion of the optical system are well controlled, and have good imaging quality.

[0105] Embodiment 2:

[0106] like Figure 4 As shown, in this embodiment, the miniaturized large-target-surface projection lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a prism L14, a protective glass CG and a DMD chip (image plane IMA) arranged in sequence along the optical axis direction, wherein the eleventh lens L11 and the twelfth lens L12 form a double cemented lens. The effective focal length of this optical system is f=14.713mm, the aperture number Fno=2.03, the maximum image plane is 16mm, and the axial distance OAL from the object side of the first lens L1 to the image side of the thirteenth lens L13 is 55.93mm; it can be seen that this optical system can achieve the effects of high resolution, miniaturization and large image plane.

[0107] Specifically, the values ​​of the parameters of the lens in this embodiment are as shown in Table 2 below:

[0108] Table 2

[0109]

[0110]

[0111] like Figure 4 As shown in the figure, the surface number OBJ represents the object surface, the surface numbers S1, S3, S5, S7, S9, S11, S13, S16, S18, S20, S22, S23, S25, S27 to S29 represent the object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the cover glass CG, and the surface numbers S2, S4, S6, S8, S10 , S12, S14, S17, S19, S21, S23, S24, S26, S28 to S30 respectively represent the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the protective glass CG, the cemented surface of the cemented lens group is regarded as one surface, STO represents the aperture, that is, the surface number S15, and the surface number IMA represents the imaging surface (image surface) of the DMD chip. The DMD chip is a digital micromirror device (DMD, Digital Micromirror Device).

[0112] Figure 5 The longitudinal spherical aberration diagram (LONGITUD INAL SPHERICAL ABER.) of the optical system indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram indicates the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa indicates the distance from the image plane to the intersection of the light and the optical axis (in mm). It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergent focus of light of each wavelength in this embodiment tends to be consistent, the diffuse spots or color halos in the imaging picture are effectively suppressed, and the difference between single wavelength and complex wavelength is small. Figure 5 It also includes the field curvature diagram of the optical system (ASTIGMATIC FIELD CURVES), where the S curve represents the sagittal field curvature at a wavelength of 520nm, and the T curve represents the meridian field curvature at a wavelength of 520nm. As can be seen from the figure, the field curvature of the optical system is small, and the field curvature and astigmatism of each field of view are well corrected. Figure 5It also includes a distortion diagram (DISTORTION) of the optical system. It can be seen from the diagram that the image deformation caused by the main beam is small and the imaging quality of the system is excellent. Figure 6 The relationship between MTF and frequency under different fields of view is shown in the figure. The center and edge of the field of view have clear images at different frequencies, and the MTF of all fields of view is greater than 0.58 at the limit frequency of 93lp / mm. In summary, the longitudinal spherical aberration, field curvature and distortion of the optical system are well controlled, and have good imaging quality.

[0113] Embodiment 3:

[0114] like Figure 7 As shown, in this embodiment, the miniaturized large-target-surface projection lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a prism L14, a protective glass CG and a DMD chip (image plane IMA) arranged in sequence along the optical axis, wherein the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 form a triple cemented lens. The effective focal length of this optical system is f=13.993mm, the aperture number Fno=2.01, the maximum image plane is 15.8mm, and the axial distance OAL from the object side of the first lens L1 to the image side of the thirteenth lens L13 is 55.25mm; it can be seen that this optical system can achieve the effects of high resolution, miniaturization and large image plane.

[0115] Specifically, the values ​​of the parameters of the lens in this embodiment are as shown in Table 3 below:

[0116] Table 3

[0117]

[0118]

[0119] like Figure 7As shown in the figure, the surface number OBJ represents the object surface, the surface numbers S1, S3, S5, S7, S9, S11, S14, S16, S18, S20, S21, S22, S24, S26 to S28 represent the object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the cover glass CG, and the surface numbers S2, S4, S6, S8, S10 , S12, S15, S17, S19, S21, S22, S23, S25, S27 to S29 represent the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the protective glass CG, respectively. The bonding surface of the bonding lens group is regarded as one surface. STO represents the aperture, that is, the surface number S13, and the surface number IMA represents the imaging surface (image surface) of the DMD chip. The DMD chip is a digital micromirror device (DMD, Digital Micromirror Device).

[0120] Figure 8 The longitudinal spherical aberration diagram (LONGITUD INAL SPHERICAL ABER.) of the optical system indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram indicates the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa indicates the distance from the image plane to the intersection of the light and the optical axis (in mm). It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergent focus of light of each wavelength in this embodiment tends to be consistent, the diffuse spots or color halos in the imaging picture are effectively suppressed, and the difference between single wavelength and complex wavelength is small. Figure 8 It also includes the field curvature diagram of the optical system (ASTIGMATIC FIELD CURVES), where the S curve represents the sagittal field curvature at a wavelength of 520nm, and the T curve represents the meridian field curvature at a wavelength of 520nm. As can be seen from the figure, the field curvature of the optical system is small, and the field curvature and astigmatism of each field of view are well corrected. Figure 8 It also includes a distortion diagram (DISTORTION) of the optical system. It can be seen from the diagram that the image deformation caused by the main beam is small and the imaging quality of the system is excellent. Fig. 9The relationship between MTF and frequency under different fields of view is shown in the figure. The center and edge of the field of view have clear images at different frequencies, and the MTF of all fields of view is greater than 0.59 at the limit frequency of 93lp / mm. In summary, the longitudinal spherical aberration, field curvature and distortion of the optical system are well controlled, and have good imaging quality.

[0121] Embodiment 4:

[0122] like Fig.10 As shown, in this embodiment, the miniaturized large-target-surface projection lens comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a prism L14, a protective glass CG and a DMD chip (image plane IMA) arranged in sequence along the optical axis direction, wherein the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 form a triplet lens. The effective focal length of this optical system is f=13.432mm, the aperture number Fno=2.02, the maximum image plane is 15.8mm, and the axial distance OAL from the object side of the first lens L1 to the image side of the thirteenth lens L13 is 55.266mm; it can be seen that this optical system can achieve the effects of high resolution, miniaturization and large image plane.

[0123] Specifically, the values ​​of the parameters of the lens in this embodiment are as shown in Table 4 below:

[0124] Table 4

[0125] Surface number Surface type Curvature radius (mm) Thickness(mm) Refractive Index Abbe number OBJ Spherical unlimited 1023.000 S1 Spherical 32.430 3.730 1.613 60.38 S2 Spherical 131.101 0.516 S3 Spherical 21.623 1.121 1.589 61.25 S4 Spherical 10.132 3.629 S5 Spherical 22.830 1.000 1.620 60.37 S6 Spherical 10.113 3.122 S7 Spherical 34.978 2.067 2.000 25.46 S8 Spherical -81.456 0.372 S9 Spherical -40.136 1.370 1.487 70.42 S10 Spherical 10.269 1.811 S11 Spherical 159.765 2.416 2.000 25.46 S12 Spherical -218.758 2.881 STO(S13) Spherical unlimited 1.992 S14 Spherical 64.319 3.534 1.717 47.92 S15 Spherical -16.822 0.128 S16 Spherical -19.988 4.653 1.457 90.27 S17 Spherical -14.356 1.370 S18 Spherical 109.586 1.299 1.673 32.18 S19 Spherical 21.476 1.057 S20 Spherical 102.175 5.057 1.593 68.34 S21 Spherical -9.719 2.313 1.847 23.79 S22 Spherical 27.157 5.780 1.593 68.34 S23 Spherical -21.158 0.224 S24 Spherical 55.384 3.822 1.946 17.94 S25 Spherical -42.800 9.830 S26 Spherical unlimited 16.000 1.713 53.83 S27 Spherical unlimited 0.600 S28 Spherical unlimited 1.100 1.510 62.91 S29 Spherical unlimited 0.303 IMA Spherical unlimited 0.000

[0126] like Fig.10As shown in the figure, the surface number OBJ represents the object surface, the surface numbers S1, S3, S5, S7, S9, S11, S14, S16, S18, S20, S21, S22, S24, S26 to S28 represent the object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the cover glass CG, and the surface numbers S2, S4, S6, S8, S10 , S12, S15, S17, S19, S21, S22, S23, S25, S27 to S29 represent the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the prism L14, and the protective glass CG, respectively. The bonding surface of the bonding lens group is regarded as one surface. STO represents the aperture, that is, the surface number S13, and the surface number IMA represents the imaging surface (image surface) of the DMD chip. The DMD chip is a digital micromirror device (DMD, Digital Micromirror Device).

[0127] Fig.11 The longitudinal spherical aberration diagram (LONGITUD INAL SPHERICAL ABER.) of the optical system indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram indicates the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa indicates the distance from the image plane to the intersection of the light and the optical axis (in mm). It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergent focus of light of each wavelength in this embodiment tends to be consistent, the diffuse spots or color halos in the imaging picture are effectively suppressed, and the difference between single wavelength and complex wavelength is small. Fig.11 It also includes the field curvature diagram of the optical system (ASTIGMATIC FIELD CURVES), where the S curve represents the sagittal field curvature at a wavelength of 520nm, and the T curve represents the meridian field curvature at a wavelength of 520nm. As can be seen from the figure, the field curvature of the optical system is small, and the field curvature and astigmatism of each field of view are well corrected. Fig.11 It also includes a distortion diagram (DISTORTION) of the optical system. It can be seen from the diagram that the image deformation caused by the main beam is small and the imaging quality of the system is excellent. Fig.12The relationship between MTF and frequency under different fields of view is shown in the figure. The center and edge of the field of view have clear images at different frequencies, and the MTF of all fields of view is greater than 0.6 at the limit frequency of 93lp / mm. In summary, the longitudinal spherical aberration, field curvature and distortion of the optical system are well controlled, and have good imaging quality.

[0128] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The above-described embodiments only express the more specific and detailed embodiments described in this application, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this application, which all belong to the protection scope of this application. Therefore, the protection scope of the patent in this application shall be based on the attached claims.

Claims

1. A miniaturized large-surface projection lens, characterized in that: The miniaturized large-target-surface projection lens comprises a first lens (L1) with positive focal power, a second lens (L2) with negative focal power, a third lens (L3) with negative focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power, a seventh lens (L7) with positive focal power, an eighth lens (L8) with positive focal power, a ninth lens (L9) with negative focal power, a tenth lens (L10) with positive focal power, an eleventh lens (L11) with negative focal power, a twelfth lens (L12) with positive focal power and a thirteenth lens (L13) with positive focal power, which are sequentially arranged along the optical axis direction, and each of the lenses is a glass spherical lens; The miniaturized large-target-surface projection lens further comprises a stop (STO), wherein the stop (STO) is located between the sixth lens (L6) and the seventh lens (L7), or between the seventh lens (L7) and the eighth lens (L8); The miniaturized large-surface projection lens also meets the following conditions: 13.13≤f≤15.8;54≤OAL≤57 Wherein, f is the effective focal length of the miniaturized large-target-surface projection lens, in mm; OAL is the on-axis distance from the object side of the first lens (L1) to the image side of the thirteenth lens (L13), in mm.

2. The miniaturized large-surface projection lens according to claim 1, characterized in that: The first lens (L1) is a convex-planar lens or a convex-concave lens, the second lens (L2) is a convex-concave lens, the third lens (L3) is a convex-concave lens, the fourth lens (L4) is a biconvex lens or a plano-convex lens, the fifth lens (L5) is a biconcave lens, the sixth lens (L6) is a plano-convex lens or a convex-planar lens, the seventh lens (L7) is a biconvex lens, the eighth lens (L8) is a biconvex lens or a concave-convex lens, the ninth lens (L9) is a convex-concave lens, the tenth lens (L10) is a biconvex lens or a concave-convex lens, the eleventh lens (L11) is a biconcave lens, the twelfth lens (L12) is a biconvex lens, and the thirteenth lens (L13) is a biconvex lens. The miniaturized large-surface projection lens further satisfies the following conditions: Among them, f1~f 13 are the focal lengths of the first lens (L1) to the thirteenth lens (L13), in millimeters; R 11 , R 21 , R 31 , R 41 , R 51 , R 61 , R 71 , R 81 , R 91 , R 101 , R 111 , R 121 , R 131 are the curvature radii of the object side surfaces of the first lens (L1) to the thirteenth lens (L13), in millimeters; R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 , R 102 , R 112 , R 122 , R 132 They are the curvature radii of the image-side surfaces of the first lens (L1) to the thirteenth lens (L13), in order, in mm; "-" indicates that the direction is the negative direction.

3. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: Where D is the entrance pupil diameter, in mm.

4. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: Wherein, SD1 is the marginal ray height on the object side of the first lens (L1), and SD13 is the marginal ray height on the image side of the thirteenth lens (L13).

5. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: -1%≤DIST≤-0.5%,RI≥60% Among them, FOV is the full field of view angle of the maximum field of view, DIST is the maximum optical distortion from the center to the edge of the field of view, and RI is the relative illumination of the miniaturized large-target projection lens on the image plane (IMA).

6. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: 6≤th4+th6+th11+th13≤11 Wherein, th4 is the middle thickness of the fourth lens (L4), th6 is the middle thickness of the sixth lens (L6), th11 is the middle thickness of the eleventh lens (L11), and th13 is the middle thickness of the thirteenth lens (L13), and the unit is mm.

7. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: 115≤abv10+abv12≤160 Wherein, abv10 is the Abbe number of the tenth lens (L10), and abv12 is the Abbe number of the twelfth lens (L12).

8. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: Wherein, f1 is the effective focal length of the first lens (L1), f2 is the effective focal length of the second lens (L2), and f3 is the effective focal length of the third lens (L3), and the unit is mm.

9. The miniaturized large-surface projection lens according to claim 1, characterized in that: The miniaturized large-surface projection lens also includes a prism (L14), and the prism (L14) is located between the thirteenth lens (L13) and the image plane (IMA).

10. The miniaturized large-surface projection lens according to claim 9, characterized in that: The miniaturized large-surface projection lens also meets the following conditions: CRA≤2.0°, 20mm≤FFL≤30mm Wherein, CRA is the maximum incident angle of the miniaturized large-target projection lens on the image plane (IMA), and FFL is the axial distance from the image side surface of the thirteenth lens (L13) to the image plane (IMA).

Images