High-definition large-aperture projection lens

Abstract

The invention discloses a high-definition large-aperture projection lens which is applied to a projection device which comprises a projection chip. The high-definition large-aperture projection lens comprises a first lens, a second lens, a third lens, a first lens group, a sixth lens, a seventh lens, a second lens group, a third lens group and a twelfth lens which are sequentially arranged in the direction close to a projection chip. The focal power of the first lens, the second lens, the third lens, the first lens group, the sixth lens, the seventh lens, the second lens group, the third lens group and the twelfth lens is negative, negative, positive, negative, positive, positive, positive, positive and positive in sequence. The device has the advantages of high definition, high contrast ratio, uniform brightness, small size, vibration resistance and good temperature change adaptability.

Description

Technical Field

[0001] The present invention belongs to the technical field of projection lenses, and particularly relates to a high-definition large-aperture projection lens. Background Art

[0002] With the development of automotive intelligence and vehicle networking technologies, in-vehicle display systems are gradually evolving from traditional instrument panels and center control screens to more advanced and diverse forms. In line with this trend, in-vehicle projection lenses have begun to be applied in modern vehicles, which can not only provide a broader field of view for information display but also enhance driving safety and entertainment experience. However, when integrating projection technology into the automotive environment, a series of unique technical and engineering challenges are faced. For example, the projection ratio of existing projection lenses is usually greater than 1.5, with a large volume and being relatively bulky, making it difficult to adapt to the compact spatial layout inside the vehicle. Secondly, the imaging quality of projection lenses on the market currently is poor, and the consistency of brightness and darkness is also poor, with relatively serious image distortion. In addition, there are also problems such as large temperature variations, frequent vibrations, and variable in-vehicle lighting conditions during vehicle operation, which affect the stability of the projection lens performance and the driving experience of users. Therefore, a high-definition large-aperture projection lens is proposed. Summary of the Invention

[0003] The purpose of the present invention is to address the above problems and propose a high-definition large-aperture projection lens, which has high definition, high contrast, and uniform brightness, and is small in volume, vibration-resistant, and has good adaptability to temperature changes.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A high-definition large-aperture projection lens proposed by the present invention is applied to a projection device. The projection device includes a projection chip. The high-definition large-aperture projection lens includes a first lens, a second lens, a third lens, a first lens group, a sixth lens, a seventh lens, a second lens group, a third lens group, and a twelfth lens arranged in sequence along the direction close to the projection chip. The optical powers of the first lens, the second lens, the third lens, the first lens group, the sixth lens, the seventh lens, the second lens group, the third lens group, and the twelfth lens are negative, negative, positive, negative, positive, positive, positive, positive, and positive in sequence.

[0006] Preferably, the high-definition large-aperture projection lens also satisfies the following conditions:

[0007] -24.97 ≤ f1 ≤ -20.43; -17.71 ≤ f2 ≤ -14.49; 28.08 ≤ f3 ≤ 34.32;

[0008] -142.46 ≤ fB1 ≤ -116.56; 70.83 ≤ f6 ≤ 86.57; 26.82 ≤ f7 ≤ 32.78;

[0009] 129.35 ≤ fB2 ≤ 158.10; 53.78 ≤ fB3 ≤ 65.73; 31.95 ≤ f12 ≤ 39.05;

[0010] Among them, f1, f2, f3, fB1, f6, f7, fB2, fB3, f12 are the focal lengths of the first lens, the second lens, the third lens, the first lens group, the sixth lens, the seventh lens, the second lens group, the third lens group, and the twelfth lens respectively, with the unit of mm.

[0011] Preferably, the first lens group includes a fourth lens and a fifth lens that are sequentially arranged and glued to each other along the direction close to the projection chip. The second lens group includes an eighth lens and a ninth lens that are sequentially arranged and glued to each other along the direction close to the projection chip. The third lens group includes a tenth lens and an eleventh lens that are sequentially arranged and glued to each other along the direction close to the projection chip. The optical powers of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens are positive, negative, positive, negative, negative, and positive in sequence.

[0012] Preferably, the high-definition large-aperture projection lens also satisfies the following conditions:

[0013] 12.78 ≤ f4 ≤ 15.62; -11.55 ≤ f5 ≤ -9.45; 15.39 ≤ f8 ≤ 18.81;

[0014] -22.77 ≤ f9 ≤ -18.63; -39.589 ≤ f10 ≤ -32.391; 21.06 ≤ f11 ≤ 25.74;

[0015] Among them, f4, f5, f8, f9, f10, f11 are the focal lengths of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens respectively, with the unit of mm.

[0016] Preferably, the first lens and the sixth lens are both plastic convex-concave aspherical lenses. The third lens, the eighth lens, and the ninth lens are all glass convex-concave spherical lenses. The second lens and the fifth lens are both glass double-concave spherical lenses. The seventh lens and the tenth lens are both glass convex-concave spherical lenses. The fourth lens, the eleventh lens, and the twelfth lens are all glass double-convex spherical lenses.

[0017] Preferably, the high-definition large-aperture projection lens also satisfies the following conditions:

[0018] 27.936 ≤ R11 ≤ 30.876; 7.891 ≤ R12 ≤ 8.721;

[0019] -67.085 ≤ R21 ≤ -60.696; 19.646 ≤ R22 ≤ 21.714;

[0020] -543.029 ≤ R31 ≤ -491.312; -19.541 ≤ R32 ≤ -17.680;

[0021] 32.072 ≤ R41 ≤ 35.448; -19.047 ≤ R42 ≤ -17.233;

[0022] -19.047 ≤ R51 ≤ -17.233; 9.386 ≤ R52 ≤ 10.374;

[0023] 11.501 ≤ R61 ≤ 12.711; 14.317 ≤ R62 ≤ 15.824;

[0024] 13.509 ≤ R71 ≤ 14.931; 54.416 ≤ R72 ≤ 60.144;

[0025] -81.585 ≤ R81 ≤ -73.815; -7.634 ≤ R82 ≤ -6.907;

[0026] -7.634 ≤ R91 ≤ -6.907; -12.789 ≤ R92 ≤ -11.571;

[0027] 40.803 ≤ R101 ≤ 45.098; 16.872 ≤ R102 ≤ 18.648;

[0028] 16.872 ≤ R111 ≤ 18.648; -23.016 ≤ R112 ≤ -20.824;

[0029] 33.440 ≤ R121 ≤ 36.960; -128.636 ≤ R122 ≤ -116.385;

[0030] Among them, R11, R21, R31, R41, R51, R61, R71, R81, R91, R101, R111, R121 are the radii of curvature of the surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens that are away from the projection chip, and R12, R22, R32, R42, R52, R62, R72, R82, R92, R102, R112, R122 are the radii of curvature of the surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens that are close to the projection chip, with the unit of mm.

[0031] Preferably, the high-definition large-aperture projection lens further satisfies the following conditions:

[0032] Lens number Refractive index Dispersion coefficient Core thickness / mm Air gap / mm Deformation temperature L1 1.536±0.1 55.98±8％ 3.25±0.2 11.5±0.2 >150℃ L2 1.946±0.1 17.94±8％ 2.51±0.2 2.55±0.2 L3 1.613±0.1 44.17±8％ 3.55±0.2 0.2±0.15 L4 1.847±0.1 23.79±8％ 3.15±0.2 0 L5 1.569±0.1 71.31±8％ 4.95±0.2 2.05±0.2 L6 1.536±0.1 55.98±8％ 3.8±0.2 0.2±0.15 >150℃ L7 1.607±0.1 56.67±8％ 4.8±0.2 3.15±0.2 L8 1.456±0.1 90.27±8％ 6±0.2 0 L9 1.954±0.1 32.32±8％ 0.95±0.2 0.2±0.15 L10 1.847±0.1 23.79±8％ 0.8±0.2 0 L11 1.437±0.1 95.10±8％ 5.72±0.2 0.2±0.15 L12 1.773±0.1 49.61±8％ 2.8±0.2

[0033] Among them, L1 to L12 are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens in sequence.

[0034] Preferably, the high-definition large-aperture projection lens further includes a main lens barrel, a fixed lens barrel, a focusing ring, a plurality of focusing guide pins, and a plurality of limit pins. The first lens, the second lens, the third lens, the first lens group, the sixth lens, the seventh lens, the second lens group, the third lens group, and the twelfth lens are all built into the main lens barrel. The main lens barrel is coaxially sleeved inside the fixed lens barrel. The focusing ring is coaxially sleeved outside the fixed lens barrel. The fixed lens barrel is provided with a plurality of straight grooves parallel to the optical axis and a plurality of arc grooves perpendicular to the optical axis. The inner wall of the focusing ring is provided with a plurality of spiral grooves. The focusing guide pins are connected to the main lens barrel and respectively pass through the straight grooves on the fixed lens barrel and then are respectively matched with the spiral grooves on the focusing ring. The limit pins are connected to the focusing ring and respectively pass through the arc grooves on the fixed lens barrel. When the focusing ring rotates around the optical axis, it drives the main lens barrel to move along the direction parallel to the optical axis for focusing.

[0035] Preferably, the high-definition large-aperture projection lens further includes a motor and a circuit board. The motor is fixed on the fixed lens barrel and is connected with a driving gear. The focusing ring is provided with a driven gear. The driving gear meshes with the driven gear and drives the focusing ring to rotate around the optical axis under the drive of the motor. The motor and the circuit board are also respectively electrically connected to the projection device.

[0036] Preferably, the high-definition large-aperture projection lens further includes a connecting seat. The projection device is detachably connected to the fixed lens barrel through the connecting seat.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] By reasonably configuring the lenses and their optical parameters, such as focal length, radius of curvature, refractive index, dispersion coefficient, core thickness, air gap, etc., especially by combining glass lenses and plastic lenses with high refractive index and low dispersion coefficient to optimize the optical design, and optimizing the structures such as the main lens barrel to obtain high-precision structural parts formed by injection molding, and using motors and optoelectronic coupling components for electronic drive design, a hybrid glass-plastic electric focus projection lens is formed. It can achieve high definition, high contrast, uniform brightness, high transmittance and good mechanical stability of the projection lens, and also meet the requirements of the vehicle projection device for the projection lens, such as small volume, anti-vibration and wide range of temperature change adaptability. It has high stability and safety, thus meeting the application of the in-vehicle projection device in complex driving environments and providing users with a safer, more convenient and comfortable driving experience. Specifically, this projection lens can be adapted to a 0.33-inch 1080P high-definition projection chip DMD, with a focal length of about f8.25mm, an aperture value of about F1.7, a projection ratio of about 1.1, a projection distance of 20 inches to 50 inches, the overall structural size of the product is less than 35mm*60mm*65mm, and the mass is less than 100 grams, which can meet the requirements of electric intelligent control for focusing and projection distance switching. Description of the Drawings

[0039] Figure 1 Schematic diagram of the optical structure of the high-definition large-aperture projection lens of the present invention;

[0040] Figure 2 Stereogram of the high-definition large-aperture projection lens of the present invention;

[0041] Figure 3 Front view of the high-definition large-aperture projection lens of the present invention;

[0042] Figure 4 For the present invention Figure 3 Left view;

[0043] Figure 5 For the present invention Figure 4 Cross-sectional view A-A;

[0044] Figure 6 Stereogram of the main lens barrel of the present invention;

[0045] Figure 7 Simulation diagram of the injection molding flow analysis path of the main lens barrel of the present invention;

[0046] Figure 8 Simulation diagram of the injection molding flow analysis deformation of the main lens barrel of the present invention;

[0047] Figure 9 Stereogram of the fixed lens barrel of the present invention;

[0048] Figure 10This is a three-dimensional view of the focus ring of the present invention.

[0049] Description of reference numerals: MB, screen; P01, first lens; G02, second lens; G03, third lens; G04, fourth lens; G05, fifth lens; P06, sixth lens; G07, seventh lens; G08, eighth lens; G09, ninth lens; G10, tenth lens; G11, eleventh lens; G12, twelfth lens; B01, first lens group; B02, second lens group; B03, third lens group; DMD, projection chip; 101, main lens barrel; 102, fixed lens barrel; 103, focus ring; 104, connecting seat; 201, first spacer; 202, second spacer; 203, third spacer; 204, fourth spacer; 205, fifth spacer; 206, sixth spacer; 207, seventh spacer; 501, focus guide pin; 502, limit pin; 601, motor; 602, circuit board; 1011, boss; 1012, blind hole; 1013, first glue injection port; 1014, second glue injection port; 1015, third glue injection port; 1016, weight reduction groove; 1017, reinforcing rib; 1021, straight groove; 1022, arc groove; 1031, spiral groove; 1032, through hole; 1033, driven gear; 1034, sensing post; 6011, driving gear; 6012, first interface; 6021, position sensor; 6022, second interface. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0051] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may also be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0052] As Figures 1-10As shown in the figure, a high-definition large-aperture projection lens is applied to a projection device. The projection device includes a projection chip DMD. The high-definition large-aperture projection lens includes a first lens P01, a second lens G02, a third lens G03, a first lens group B01, a sixth lens P06, a seventh lens G07, a second lens group B02, a third lens group B03, and a twelfth lens G12, which are arranged in sequence along the direction close to the projection chip DMD. The optical powers of the first lens P01, the second lens G02, the third lens G03, the first lens group B01, the sixth lens P06, the seventh lens G07, the second lens group B02, the third lens group B03, and the twelfth lens G12 are negative, negative, positive, negative, positive, positive, positive, positive, and positive in sequence.

[0053] Among them, the light rays emitted by the projection chip DMD pass through the twelfth lens G12, the third lens group B03, the second lens group B02, the seventh lens G07, the sixth lens P06, the first lens group B01, the third lens G03, the second lens G02, and the first lens P01 in sequence and are projected, such as projected onto a screen.

[0054] In an embodiment, the high-definition large-aperture projection lens further satisfies the following conditions:

[0055] -24.97 ≤ f1 ≤ -20.43; -17.71 ≤ f2 ≤ -14.49; 28.08 ≤ f3 ≤ 34.32;

[0056] -142.46 ≤ fB1 ≤ -116.56; 70.83 ≤ f6 ≤ 86.57; 26.82 ≤ f7 ≤ 32.78;

[0057] 129.35 ≤ fB2 ≤ 158.10; 53.78 ≤ fB3 ≤ 65.73; 31.95 ≤ f12 ≤ 39.05;

[0058] Among them, f1, f2, f3, fB1, f6, f7, fB2, fB3, and f12 are the focal lengths of the first lens P01, the second lens G02, the third lens G03, the first lens group B01, the sixth lens P06, the seventh lens G07, the second lens group B02, the third lens group B03, and the twelfth lens G12 in sequence, with the unit of mm. By reasonably setting the focal lengths of the first lens P01, the second lens G02, the third lens G03, the first lens group B01, the sixth lens P06, the seventh lens G07, the second lens group B02, the third lens group B03, and the twelfth lens G12, it helps to ensure the requirements of high definition, large aperture, and miniaturization.

[0059] In one embodiment, the first lens group B01 includes a fourth lens G04 and a fifth lens G05 that are sequentially arranged and glued to each other along the direction close to the projection chip DMD. The second lens group B02 includes an eighth lens G08 and a ninth lens G09 that are sequentially arranged and glued to each other along the direction close to the projection chip DMD. The third lens group B03 includes a tenth lens G10 and an eleventh lens G11 that are sequentially arranged and glued to each other along the direction close to the projection chip DMD. The optical powers of the fourth lens G04, the fifth lens G05, the eighth lens G08, the ninth lens G09, the tenth lens G10, and the eleventh lens G11 are positive, negative, positive, negative, negative, and positive in sequence.

[0060] In one embodiment, the high-definition large-aperture projection lens further satisfies the following conditions:

[0061] 12.78 ≤ f4 ≤ 15.62; -11.55 ≤ f5 ≤ -9.45; 15.39 ≤ f8 ≤ 18.81;

[0062] -22.77 ≤ f9 ≤ -18.63; -39.589 ≤ f10 ≤ -32.391; 21.06 ≤ f11 ≤ 25.74;

[0063] Wherein, f4, f5, f8, f9, f10, and f11 are the focal lengths of the fourth lens G04, the fifth lens G05, the eighth lens G08, the ninth lens G09, the tenth lens G10, and the eleventh lens G11 respectively, with the unit of mm.

[0064] In one embodiment, both the first lens P01 and the sixth lens P06 are plastic convex-concave aspherical lenses. The third lens G03, the eighth lens G08, and the ninth lens G09 are all glass convex-concave spherical lenses. The second lens G02 and the fifth lens G05 are both glass biconcave spherical lenses. The seventh lens G07 and the tenth lens G10 are both glass convex-concave spherical lenses. The fourth lens G04, the eleventh lens G11, and the twelfth lens G12 are all glass biconvex spherical lenses. By reasonably setting the shapes and materials of each lens, it helps to ensure high imaging quality and meet the requirements of small size and light weight.

[0065] In one embodiment, the high-definition large-aperture projection lens further satisfies the following conditions:

[0066] 27.936 ≤ R11 ≤ 30.876; 7.891 ≤ R12 ≤ 8.721;

[0067] -67.085 ≤ R21 ≤ -60.696; 19.646 ≤ R22 ≤ 21.714;

[0068] -543.029 ≤ R31 ≤ -491.312; -19.541 ≤ R32 ≤ -17.680;

[0069] 32.072 ≤ R41 ≤ 35.448; -19.047 ≤ R42 ≤ -17.233;

[0070] -19.047 ≤ R51 ≤ -17.233; 9.386 ≤ R52 ≤ 10.374;

[0071] 11.501 ≤ R61 ≤ 12.711; 14.317 ≤ R62 ≤ 15.824;

[0072] 13.509 ≤ R71 ≤ 14.931; 54.416 ≤ R72 ≤ 60.144;

[0073] -81.585 ≤ R81 ≤ -73.815; -7.634 ≤ R82 ≤ -6.907;

[0074] -7.634 ≤ R91 ≤ -6.907; -12.789 ≤ R92 ≤ -11.571;

[0075] 40.803 ≤ R101 ≤ 45.098; 16.872 ≤ R102 ≤ 18.648;

[0076] 16.872 ≤ R111 ≤ 18.648; -23.016 ≤ R112 ≤ -20.824;

[0077] 33.440 ≤ R121 ≤ 36.960; -128.636 ≤ R122 ≤ -116.385;

[0078] Among them, R11, R21, R31, R41, R51, R61, R71, R81, R91, R101, R111, R121 are the radii of curvature of the mirrors of the first lens P01, second lens G02, third lens G03, fourth lens G04, fifth lens G05, sixth lens P06, seventh lens G07, eighth lens G08, ninth lens G09, tenth lens G10, eleventh lens G11, and twelfth lens G12 that are far from the projection chip DMD in sequence; R12, R22, R32, R42, R52, R62, R72, R82, R92, R102, R112, R122 are the radii of curvature of the mirrors of the first lens P01, second lens G02, third lens G03, fourth lens G04, fifth lens G05, sixth lens P06, seventh lens G07, eighth lens G08, ninth lens G09, tenth lens G10, eleventh lens G11, and twelfth lens G12 that are close to the projection chip DMD in sequence, with the unit of mm. By reasonably setting the range of the radii of curvature of each lens, it helps to ensure high imaging quality and miniaturization requirements.

[0079] In one embodiment, the high-definition large aperture projection lens also meets the following conditions:

[0080]

[0081]

[0082] Among them, L1 to L12 are the first lens P01, the second lens G02, the third lens G03, the fourth lens G04, the fifth lens G05, the sixth lens P06, the seventh lens G07, the eighth lens G08, the ninth lens G09, the tenth lens G10, the eleventh lens G11, and the twelfth lens G12. By reasonably setting the refractive index, dispersion coefficient, core thickness, air spacing, and deformation temperature of each lens, it is helpful to ensure high imaging quality and a wide temperature range, as well as miniaturization requirements.

[0083] In one embodiment, the high-definition large-aperture projection lens further includes a main lens barrel 101, a fixed lens barrel 102, a focus ring 103, a plurality of focus guide pins 501 and a plurality of limit pins 502. The first lens P01, the second lens G02, the third lens G03, the first lens group B01, the sixth lens P06, the seventh lens G07, the second lens group B02, the third lens group B03, and the twelfth lens G12 are all built into the main lens barrel 101. The main lens barrel 101 is coaxially sleeved in the fixed lens barrel 102. The focus ring 103 is coaxially sleeved outside the fixed lens barrel 102. The fixed lens barrel 102 There are several straight grooves 1021 parallel to the optical axis and several arc grooves 1022 perpendicular to the optical axis, and the inner wall of the focus ring 103 is provided with several spiral grooves 1031. The focus guide pins 501 are connected to the main lens barrel 101 and pass through the straight grooves 1021 on the fixed lens barrel 102 one by one and then match with the spiral grooves 1031 on the focus ring 103 one by one. The limit pins 502 are connected to the focus ring 103 and pass through the arc grooves 1022 on the fixed lens barrel 102 one by one. When the focus ring 103 rotates around the optical axis, it drives the main lens barrel 101 to move in a direction parallel to the optical axis for focusing. It is easy to understand that the number of the focus guide pins 501 and the limit pins 502 can be selected according to actual needs, such as two for both.

[0084] Among them, by means of tight tolerance matching between components and ensuring that the deformation of structural parts under temperature changes is within the tolerance range allowed by the optical design, the anti-vibration and working stability performance are good, and fast focusing is facilitated.

[0085] In one embodiment, the high-definition large-aperture projection lens further includes a motor 601 and a circuit board 602. The motor 601 is fixed on the fixed lens barrel 102 and is connected with a driving gear 6011. A driven gear 1033 is provided on the focusing ring 103. The driving gear 6011 meshes with the driven gear 1033 and drives the focusing ring 103 to rotate around the optical axis under the drive of the motor 601. The motor 601 and the circuit board 602 are also respectively electrically connected to the projection device. Using electric drive for focusing helps with remote operation and improves convenience and focusing accuracy.

[0086] In one embodiment, the high-definition large-aperture projection lens further includes a connecting seat 104. The projection device is detachably connected to the fixed lens barrel 102 through the connecting seat 104. This facilitates quick disassembly, maintenance, or replacement.

[0087] Embodiment 1:

[0088] As Figure 1 shown, the high-definition large-aperture projection lens in this embodiment adopts a hybrid glass-plastic design. Light enters the projection lens from the right-side projection chip DMD and is projected onto the left-side screen MB through the projection lens. That is, the projection lens is sequentially provided with a first lens P01, a second lens G02, a third lens G03, a fourth lens G04, a fifth lens G05, a sixth lens P06, a seventh lens G07, an eighth lens G08, a ninth lens G09, a tenth lens G10, an eleventh lens G11, and a twelfth lens G12 along the reverse direction of the light. Among them, the first lens P01 and the sixth lens P06 are both plastic convex-concave aspherical lenses, the third lens G03, the eighth lens G08, and the ninth lens G09 are all glass convex-concave spherical lenses, the second lens G02 and the fifth lens G05 are both glass double-concave spherical lenses, the seventh lens G07 and the tenth lens G10 are both glass convex-concave spherical lenses, and the fourth lens G04, the eleventh lens G11, and the twelfth lens G12 are all glass double-convex spherical lenses. The fourth lens G04 and the fifth lens G05 are cemented into a first lens group B01, the eighth lens G08 and the ninth lens G09 are cemented into a second lens group B02, and the tenth lens G10 and the eleventh lens G11 are cemented into a third lens group B03. In this embodiment, the focal length of the first lens group B01 is -129.506 mm, the focal length of the second lens group B02 is 143.723 mm, and the focal length of the third lens group B03 is 59.759 mm.

[0089] The optical parameters of the above lenses satisfy the following table:

[0090]

[0091] The aspherical equations all satisfy the following expression:

[0092]

[0093] In the formula, Z is the sagitta, c is the curvature, y is the radial coordinate, k is the conic coefficient of the cone, and α2, α4, α6, α8, α 10 , α 12 , α 14 , α 16 are the aspheric high-order coefficients.

[0094] In this embodiment, the optical parameters of the aspheric lens satisfy the following table:

[0095]

[0096]

[0097] Among them, c is the curvature, that is, 1 / R, and R is the radius of curvature. The first surface corresponds to the radius of curvature of the mirror surface of the lens far from the projection chip DMD, and the second surface corresponds to the radius of curvature of the mirror surface of the lens close to the projection chip DMD.

[0098] According to the above parameters, the projection lens of this embodiment can achieve the following indicators:

[0099] This projection lens can be adapted to a 0.33-inch 1080P high-definition projection chip DMD, with a focal length f of 8.25 mm, an aperture value F of 1.7, a projection ratio of 1.1, a projection distance of 20 inches to 50 inches, and the overall structural size of the product is less than 35 mm * 60 mm * 65 mm, and the product quality is less than 100 grams, which can meet the requirements of electric intelligent control for focusing and projection distance switching.

[0100] Embodiment 2:

[0101] As Figures 2-10 shown, a high-definition large-aperture projection lens. Based on Embodiment 1, the high-definition large-aperture projection lens further includes a main lens barrel 101, a fixed lens barrel 102, a focusing ring 103, a plurality of focusing guide pins 501, a plurality of limit pins 502, and a plurality of spacer rings to form a focusing structure, and is electrically adjusted by a motor 601 and a circuit board 602. The motor 601 is fixed on the fixed lens barrel 102 and is connected with a driving gear 6011. A driven gear 1033 is provided on the focusing ring 103. The driving gear 6011 meshes with the driven gear 1033 and drives the focusing ring 103 to rotate around the optical axis under the drive of the motor 601. The motor 601 and the circuit board 602 are also respectively electrically connected to the projection device, and the projection device is also connected to the fixed lens barrel 102 through a connecting seat 104, so that this projection lens is an electric projection lens.

[0102] Among them, the main barrel 101 is used to assemble each lens and spacer. There is also a boss 1011 on the inner wall of the main barrel 101. The boss 1011 is used to assemble the lens and spacer into the main barrel 101 in two sides, and the boss 1011 is used to ensure the air gap between the ninth lens G09 and the tenth lens G10; the lens and spacer are assembled into the main barrel 101 in two side directions. When assembling on the left side, they are placed in sequence: the second lens group B02, the sixth spacer 206, the seventh lens G07, the fifth spacer 205, the sixth lens P06, the fourth spacer 204, the first lens group B01, the third spacer 203, the third lens G03, the second spacer 202, the second lens G02, the first spacer 201, the first lens P01; when assembling on the right side, they are placed in sequence: the third lens group B03, the seventh spacer 207, the twelfth lens G12.

[0103] Specifically, the first spacer 201 is used to ensure the air gap between the first lens P01 and the second lens G02; the second spacer 202 is used to ensure the air gap between the second lens G02 and the third lens G03; the third spacer 203 is used to ensure the air gap between the third lens G03 and the fourth lens G04; the fourth spacer 204 is used to ensure the air gap between the fifth lens G05 and the sixth lens P06; the fifth spacer 205 is used to ensure the air gap between the sixth lens P06 and the seventh lens G07; the sixth spacer 206 is used to ensure the air gap between the seventh lens G07 and the eighth lens G08; the seventh spacer 207 is used to ensure the air gap between the eleventh lens G11 and the twelfth lens G12.

[0104] As Figure 5 and Figure 6 shown, there is a boss 1011 designed on the inner wall of the main barrel 101. There are two symmetrically distributed blind holes 1012, a first glue injection port 1013, and a second glue injection port 1014 on the outer wall of the main barrel 101. A third glue injection port 1015 is opened at the end of the main barrel 101 close to the projection chip DMD. There are also several weight reduction grooves 1016 and several reinforcing ribs 1017 on the outer wall of the main barrel 101. The weight reduction grooves 1016 are designed by reducing the glue, that is, reducing the glue in the overall structure of the main barrel 101, especially in the relatively thick parts locally, to make the structure thickness uniform, facilitate injection molding, and reduce the risk of partial dimensional shrinkage.

[0105] Figure 7 and Figure 8It is a simulation diagram of the injection mold flow analysis of the main lens barrel 101. By optimizing the structural design of the main lens barrel 101 through the first injection port 1013, the second injection port 1014, the third injection port 1015, the weight reduction groove 1016 and the reinforcing rib 1017, substituting the mechanical parameters of the corresponding material to simulate the product structure after injection molding, it can be seen that the wall thickness of each part of the main lens barrel 101 is evenly distributed during the injection molding process, and the deformation of the main structure does not affect the assembly of the lens and the spacer ring, and will not affect the main optical and mechanical properties of the lens product.

[0106] In this embodiment, the main lens barrel 101, the fixed lens barrel 102, the focusing ring 103 and the connecting seat 104 are all injection molded with a polycarbonate material added with 10% - 30% glass fiber, and its material properties meet:

[0107] Serial number Item Parameter 1 Density <![CDATA[1.18~1.2g / cm 3 > 2 Coefficient of expansion (60～70)×10^-6 / ℃ 3 Heat deformation temperature >140℃

[0108] As Figure 9 shown, two straight grooves 1021 that are symmetrically distributed and parallel to the optical axis are provided on the side wall of the fixed lens barrel 102, and two arc grooves 1022 perpendicular to the optical axis. As Figure 10 shown, two helical grooves 1031 that are symmetrically distributed are provided on the inner wall of the focusing ring 103, two through holes 1032 are provided on the side wall of the focusing ring 103, and a driven gear 1033 and an induction post 1034 are further provided on the outer wall of the focusing ring 103.

[0109] As Figure 2 、 Figure 5 shown, the main lens barrel 101 is coaxially placed inside the fixed lens barrel 102, the focusing ring 103 is coaxially sleeved outside the fixed lens barrel 102. Two focusing guide pins 501 are respectively passed through the straight grooves 1021 on the fixed lens barrel 102 and fixed on the blind holes 1012 of the main lens barrel 101. The helical grooves 1031 on the focusing ring 103 are aligned with the focusing guide pins 501, so that the focusing ring 103 makes a helical movement on the fixed lens barrel 102. The limit pin 502 is passed through the through hole 1032 on the focusing ring 103 and fixed, and the other end of the limit pin 502 is placed in the arc groove 1022 of the fixed lens barrel 102.

[0110] Among them, the degree of freedom of the limit pin 502 is restricted as follows: The limit pin 502 is fixed on the focusing ring 103 and placed in the arc groove 1022 of the fixed lens barrel 102, restricting the degree of freedom of moving along the optical axis direction, and the circumferential degree of freedom around the optical axis is restricted by the radian size of the arc groove 1022; By restricting the degree of freedom of the limit pin 502, the degree of freedom of the focusing ring 103 is restricted. The focusing ring 103 can only make a circumferential movement with the optical axis as the reference on the fixed lens barrel 102, and the rotation angle is restricted by the radian size of the arc groove 1022 of the fixed lens barrel 102.

[0111] Among them, the spiral groove 1031 of the focusing ring 103, the straight groove 1021 of the fixed lens barrel 102, and the focusing guide pin 501 cooperate to form a cam structure, which converts the rotational motion of the focusing ring 103 with the optical axis as the reference into a linear reciprocating motion of the focusing guide pin 501 parallel to the optical axis. Thus, the main lens barrel 101 is driven by the focusing guide pin 501 to perform a linear reciprocating motion parallel to the optical axis. When the main lens barrel 101 performs a linear reciprocating motion parallel to the optical axis, it drives each lens to perform a linear reciprocating motion on the optical axis. By changing the relative distance between the lens and the projection chip DMD, the focusing function of the projection lens is realized.

[0112] As Figure 3 , Figure 4 shown, the projection lens is designed with a motor 601, a circuit board 602 and the above focusing mechanism to form an electronic drive mechanism. Among them, the motor 601 is fixed on the fixed lens barrel 102. The motor 601 is designed with a driving gear 6011 for meshing with the driven gear 1033 on the focusing ring 103 to realize the electronic drive mechanism. The rotation of the gear of the motor 601 drives the focusing ring 103 to rotate, thereby driving the main lens barrel 101 to perform a linear reciprocating motion parallel to the optical axis to realize the focusing function of the lens. The circuit board 602 is fixed on the fixed lens barrel 102. Two optocoupler elements, namely position sensors 6021, are designed on the circuit board 602. An induction column 1034 is designed on the focusing ring 103. The optocoupler elements are distributed in a fan shape with the optical axis as the center on the circuit board 602. During the rotation of the focusing ring 103, the induction column 1034 will pass through the optocoupler elements to block and cut off the optical signal. The circuit board 602 outputs an electrical signal to the projection device through the conduction and cut-off of the optical signal, thereby realizing the real-time feedback of the relative distance between the lens and the projection chip DMD by the projection device through the electronic signal.

[0113] As Figure 2 shown, a first interface 6012 is designed on the motor 601 for connecting one wiring port of the projection device, and a second interface 6022 is designed on the circuit board 602 for connecting another wiring port of the projection device.

[0114] Among them, the motor 601 adopts a stepping control drive mode, and the stepping angle is 0.0766° / step. Through the gear speed calculation formula:

[0115] n1 / n2 = Z2 / Z1

[0116] The speed and angle calculation formula:

[0117] rpm = PPS*60 / (360° / ω)

[0118] Among them, n1 represents the rotational speed of the driving gear 6011, n2 represents the rotational speed of the driven gear 1033, Z1 represents the number of teeth of the driving gear 6011, Z2 represents the number of teeth of the driven gear 1033, rpm represents the rotational speed of the motor 601, PPS represents the pulse speed of the motor 601, and ω represents the stepping angle of the motor 601.

[0119] Substitute the pulse speed PPS of the motor 601 as 500 steps / second, the stepping angle ω of the motor 601 as 0.0766° / step, the number of teeth of the driving gear 6011 as 32, and the number of teeth of the driven gear 1033 as 72. It is obtained that the rotational speed rpm of the motor 601 is 6.38 revolutions per minute, the rotational speed of the focusing ring 103 is 2.83 revolutions per minute, and the stepping angle of the focusing ring 103 is 0.034° / step. Substitute the lead of the helical groove 1031 on the focusing ring 103 as 18 mm, and it is obtained that the stroke of a 0.034° rotation angle is 0.0017 mm. That is, when each pulse signal is applied to the motor 601, the driven gear 1033 on the focusing ring 103 is driven by the driving gear 6011 on the motor 601 to rotate, thereby driving the focusing guide pin 501 to displace 0.0017 mm parallel to the optical axis. That is, the main lens barrel 101 moves parallel to the optical axis, so that the relative distance between the lens and the projection chip DMD changes by 0.0017 mm.

[0120] Through the design of the above-mentioned focusing mechanism and electronic drive mechanism, according to the changes in ambient temperature and projection distance, such as adapting to temperature changes from -30°C to +80°C, for different temperature changes, the focal plane of the projection lens will change, and the projected image will change slightly. By refocusing, the projection device outputs pulse signals corresponding to the number of steps to drive the change of the focal plane of the projection lens, thereby realizing the automatic focusing function of the projected image.

[0121] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0122] The above-described embodiments only express the embodiments of the present application that are described in more specific and detailed manner, but should not be construed as a limitation on the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A high-definition large-aperture projection lens, applied to a projection device, wherein the projection device comprises a projection chip (DMD), characterized in that: The high-definition large-aperture projection lens comprises a first lens (P01), a second lens (G02), a third lens (G03), a first lens group (B01), a sixth lens (P06), a seventh lens (G07), a second lens group (B02), a third lens group (B03) and a twelfth lens (G12) which are arranged in sequence along a direction close to the projection chip (DMD), and the optical focal lengths of the first lens (P01), the second lens (G02), the third lens (G03), the first lens group (B01), the sixth lens (P06), the seventh lens (G07), the second lens group (B02), the third lens group (B03) and the twelfth lens (G12) are negative, negative, positive, negative, positive, positive, positive, positive, positive, positive and positive in sequence.

2. The high-definition large aperture projection lens according to claim 1, characterized in that: The high-definition large aperture projection lens also meets the following conditions: -24.97≤f1≤-20.43; -17.71≤f2≤-14.49; 28.08≤f3≤34.32; -142.46≤fB1≤-116.56; 70.83≤f6≤86.57; 26.82≤f7≤32.78; 129.35≤fB2≤158.10; 53.78≤fB3≤65.73;31.95≤f12≤39.05; Among them, f1, f2, f3, fB1, f6, f7, fB2, fB3, and f12 are respectively the focal lengths of the first lens (P01), the second lens (G02), the third lens (G03), the first lens group (B01), the sixth lens (P06), the seventh lens (G07), the second lens group (B02), the third lens group (B03), and the twelfth lens (G12), and the unit is mm.

3. The high-definition large aperture projection lens according to claim 2, characterized in that: The first lens group (B01) comprises a fourth lens (G04) and a fifth lens (G05) which are sequentially arranged along a direction close to the projection chip (DMD) and glued to each other, the second lens group (B02) comprises an eighth lens (G08) and a ninth lens (G09) which are sequentially arranged along a direction close to the projection chip (DMD) and glued to each other, the third lens group (B03) comprises a tenth lens (G10) and an eleventh lens (G11) which are sequentially arranged along a direction close to the projection chip (DMD) and glued to each other, and the optical focal powers of the fourth lens (G04), the fifth lens (G05), the eighth lens (G08), the ninth lens (G09), the tenth lens (G10) and the eleventh lens (G11) are positive, negative, positive, negative, negative, positive, respectively.

4. The high-definition large aperture projection lens according to claim 3, characterized in that: The high-definition large aperture projection lens also meets the following conditions: 12.78≤f4≤15.62;-11.55≤f5≤-9.45;15.39≤f8≤18.81; -22.77≤f9≤-18.63; -39.589≤f10≤-32.391; 21.06≤f11≤25.74; Among them, f4, f5, f8, f9, f10, and f11 are the focal lengths of the fourth lens (G04), the fifth lens (G05), the eighth lens (G08), the ninth lens (G09), the tenth lens (G10), and the eleventh lens (G11), respectively, and the unit is mm.

5. The high-definition large aperture projection lens as claimed in claim 3, characterized in that: The first lens (P01) and the sixth lens (P06) are both plastic convex-concave aspheric lenses, the third lens (G03), the eighth lens (G08) and the ninth lens (G09) are all glass concave-convex spherical lenses, the second lens (G02) and the fifth lens (G05) are both glass biconcave spherical lenses, the seventh lens (G07) ​​and the tenth lens (G10) are both glass convex-concave spherical lenses, and the fourth lens (G04), the eleventh lens (G11) and the twelfth lens (G12) are all glass biconvex spherical lenses.

6. The high-definition large aperture projection lens as claimed in claim 3, characterized in that: The high-definition large aperture projection lens also meets the following conditions: 27.936≤R11≤30.876;7.891≤R12≤8.721; -67.085≤R21≤-60.696; 19.646≤R22≤21.714; -543.029≤R31≤-491.312;-19.541≤R32≤-17.680; 32.072≤R41≤35.448;-19.047≤R42≤-17.233; -19.047≤R51≤-17.233; 9.386≤R52≤10.374; 11.501≤R61≤12.711; 14.317≤R62≤15.824; 13.509≤R71≤14.931; 54.416≤R72≤60.144; -81.585≤R81≤-73.815; -7.634≤R82≤-6.907; -7.634≤R91≤-6.907; -12.789≤R92≤-11.571; 40.803≤R101≤45.098;16.872≤R102≤18.648; 16.872≤R111≤18.648;-23.016≤R112≤-20.824; 33.440≤R121≤36.960;-128.636≤R122≤-116.385; Wherein, R11, R21, R31, R41, R51, R61, R71, R81, R91, R101, R111, and R121 are respectively the curvature radii of the mirror surfaces of the first lens (P01), the second lens (G02), the third lens (G03), the fourth lens (G04), the fifth lens (G05), the sixth lens (P06), the seventh lens (G07), the eighth lens (G08), the ninth lens (G09), the tenth lens (G10), the eleventh lens (G11), and the twelfth lens (G12) away from the projection chip (DMD), and R 12, R22, R32, R42, R52, R62, R72, R82, R92, R102, R112, and R122 are respectively the curvature radii of the mirror surfaces of the first lens (P01), the second lens (G02), the third lens (G03), the fourth lens (G04), the fifth lens (G05), the sixth lens (P06), the seventh lens (G07), the eighth lens (G08), the ninth lens (G09), the tenth lens (G10), the eleventh lens (G11), and the twelfth lens (G12) close to the projection chip (DMD), and the unit is mm.

7. The high-definition large aperture projection lens according to claim 3, characterized in that: The high-definition large aperture projection lens also meets the following conditions: Among them, L1 to L12 are respectively the first lens (P01), the second lens (G02), the third lens (G03), the fourth lens (G04), the fifth lens (G05), the sixth lens (P06), the seventh lens (G07), the eighth lens (G08), the ninth lens (G09), the tenth lens (G10), the eleventh lens (G11), and the twelfth lens (G12).

8. The high-definition large aperture projection lens according to claim 1, characterized in that: The high-definition large-aperture projection lens further comprises a main lens barrel (101), a fixed lens barrel (102), a focus ring (103), a plurality of focus guide pins (501) and a plurality of limit pins (502); the first lens (P01), the second lens (G02), the third lens (G03), the first lens group (B01), the sixth lens (P06), the seventh lens (G07), the second lens group (B02), the third lens group (B03) and the twelfth lens (G12) are all built into the main lens barrel (101); the main lens barrel (101) is coaxially sleeved in the fixed lens barrel (102); the focus ring (103) is coaxially sleeved outside the fixed lens barrel (102); the fixed lens barrel (102) A plurality of straight grooves (1021) parallel to the optical axis and a plurality of arc grooves (1022) perpendicular to the optical axis are provided on the main lens barrel (101); a plurality of spiral grooves (1031) are provided on the inner wall of the focus ring (103); the focus guide pins (501) are connected to the main lens barrel (101) and pass through the straight grooves (1021) on the fixed lens barrel (102) one by one and then cooperate with the spiral grooves (1031) on the focus ring (103) one by one; the limit pins (502) are connected to the focus ring (103) and pass through the arc grooves (1022) on the fixed lens barrel (102) one by one; when the focus ring (103) rotates around the optical axis, it drives the main lens barrel (101) to move along a direction parallel to the optical axis for focusing.

9. The high-definition large aperture projection lens according to claim 1, characterized in that: The high-definition large-aperture projection lens further comprises a motor (601) and a circuit board (602); the motor (601) is fixed on the fixed lens barrel (102) and is connected to a driving gear (6011); a driven gear (1033) is provided on the focus ring (103); the driving gear (6011) meshes with the driven gear (1033) and drives the focus ring (103) to rotate around the optical axis under the drive of the motor (601); and the motor (601) and the circuit board (602) are also respectively electrically connected to the projection device.

10. The high-definition large aperture projection lens according to claim 1, characterized in that: The high-definition large-aperture projection lens also includes a connection seat (104), and the projection device is detachably connected to the fixed lens barrel (102) via the connection seat (104).

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