High-definition large-aperture projection lens

Abstract

The utility model discloses a high-definition large-aperture projection lens, which is applied to a projection device comprising 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] This utility model belongs to the field of projection lens technology, specifically relating to a high-definition large-aperture projection lens. Background Technology

[0002] With the development of automotive intelligence and vehicle networking technologies, in-vehicle display systems are gradually evolving from traditional dashboards and central control screens to more advanced and diversified forms. Following this trend, in-vehicle projection lenses are beginning to be used in modern vehicles, providing not only a wider field of view for information display but also enhancing driving safety and entertainment experience. However, integrating projection technology into the automotive environment faces a series of unique technical and engineering challenges. For example, existing projection lenses typically have a throw ratio greater than 1.5, are large and bulky, and difficult to adapt to the compact space of a vehicle. Secondly, current projection lenses on the market have poor image quality, poor consistency in brightness and darkness, and significant image distortion. Furthermore, issues such as large temperature variations, frequent vibrations, and variable lighting conditions in the automotive environment affect the stability of the projection lens performance and the user's driving experience. Therefore, a high-definition, large-aperture projection lens is proposed. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by proposing a high-definition, large-aperture projection lens that features high definition, high contrast, and uniform brightness, while also being small in size, vibration-resistant, and adaptable to temperature changes.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This invention proposes a high-definition, large-aperture projection lens for use in a projection device. The projection device includes a projection chip, and 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 sequentially along the direction close to the projection chip. The optical 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, positive, positive, positive, positive, positive, positive, positive, positive, positive.

[0006] Preferably, the high-definition, large-aperture projection lens also meets 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] Where f1, f2, f3, fB1, f6, f7, fB2, fB3, and 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, in mm.

[0011] Preferably, the first lens group includes a fourth lens and a fifth lens that are sequentially arranged and bonded together 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 bonded together along the direction close to the projection chip, and the third lens group includes a tenth lens and an eleventh lens that are sequentially arranged and bonded together along the direction close to the projection chip. The optical power of the fourth lens, the fifth lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens is positive, negative, positive, negative, negative, and positive, respectively.

[0012] Preferably, the high-definition, large-aperture projection lens also meets 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] Where f4, f5, f8, f9, f10, and f11 are the focal lengths of the fourth, fifth, eighth, ninth, tenth, and eleventh lenses, respectively, in mm.

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

[0017] Preferably, the high-definition, large-aperture projection lens also meets 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, and R121 are the radii of curvature of the mirror surfaces of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth lenses, respectively, away from the projection chip; and R12, R22, R32, R42, R52, R62, R72, R82, R92, R102, R112, and R122 are the radii of curvature of the mirror surfaces of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth lenses, respectively, close to the projection chip, in mm.

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

[0032]

[0033] Among them, L1~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, respectively.

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

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

[0036] Preferably, the high-definition large-aperture projection lens also includes a connector, and the projection device is detachably connected to the fixed lens barrel through the connector.

[0037] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0038] This projection lens achieves high definition, high contrast, uniform brightness, high transmittance, and good mechanical stability through the rational configuration of lenses and their optical parameters, such as focal length, radius of curvature, refractive index, dispersion coefficient, core thickness, and air gap. Specifically, it utilizes a combination of high-refractive-index, low-dispersion-coefficient glass and plastic lenses for optimized optical design. Furthermore, it optimizes the main lens barrel and other structural components to obtain high-precision injection-molded components. The use of motors and optocouplers for electronic drive design results in a hybrid glass-plastic motorized focusing projection lens. This allows for high-definition projection, high contrast, uniform brightness, high transmittance, and good mechanical stability. It also meets the requirements of vehicle projection devices for small size, vibration resistance, and wide temperature range adaptability, exhibiting high stability and safety. This enables the application of in-vehicle projection devices in complex driving environments, providing users with a safer, more convenient, and more comfortable driving experience. Specifically, this projection lens is compatible with a 0.33-inch 1080P DMD projection chip, with a focal length of approximately f8.25mm, an aperture of approximately F1.7, a throw ratio of approximately 1.1, a projection distance of 20 inches to 50 inches, and an overall structural dimension of less than 35mm. 60mm With a diameter of 65mm and a weight of less than 100 grams, it can meet the requirements of electric intelligent control focusing and projection distance switching. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the optical structure of the high-definition large-aperture projection lens of this utility model;

[0040] Figure 2 This is a three-dimensional view of the high-definition large-aperture projection lens of this utility model;

[0041] Figure 3 This is a front view of the high-definition large-aperture projection lens of this utility model;

[0042] Figure 4 This utility model Figure 3 The left view;

[0043] Figure 5 This utility model Figure 4 Sectional view AA;

[0044] Figure 6 This is a perspective view of the main lens barrel of this utility model;

[0045] Figure 7 This is a simulation diagram of the injection mold flow analysis path of the main lens barrel of this utility model;

[0046] Figure 8 This is a simulation diagram of the injection molding flow analysis and deformation of the main lens barrel of this utility model;

[0047] Figure 9 This is a perspective view of the fixed lens tube of this utility model;

[0048] Figure 10 This is a perspective view of the focusing ring of this utility model.

[0049] Explanation of reference numerals in the attached diagram: 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, focusing ring; 104, connecting base; 201, first spacer; 202, second spacer; 203, third spacer; 204, ... 4th spacer ring; 205, 5th spacer ring; 206, 6th spacer ring; 207, 7th spacer ring; 501, focusing guide pin; 502, limiting pin; 601, motor; 602, circuit board; 1011, boss; 1012, blind hole; 1013, first injection port; 1014, second injection port; 1015, third injection port; 1016, weight reduction groove; 1017, reinforcing rib; 1021, straight groove; 1022, curved 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

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this 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 be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application.

[0052] like Figure 1-10As shown, a high-definition large-aperture projection lens is used in 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 arranged sequentially along the direction close to the projection chip DMD. The optical power 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 is negative, negative, positive, negative, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive.

[0053] The light emitted by the projection chip DMD passes sequentially 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 before being projected onto a screen.

[0054] In one embodiment, the high-definition, large-aperture projection lens also satisfies the following condition:

[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] Wherein, 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, respectively, in mm. By appropriately 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 is helpful 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 bonded together 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 bonded together along the direction close to the projection chip DMD; and the third lens group B03 includes a tenth lens G10 and an eleventh lens G11 that are sequentially arranged and bonded together along the direction close to the projection chip DMD. The optical power 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 is positive, negative, positive, negative, negative, and positive, respectively.

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

[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] Where 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, in mm.

[0064] In one embodiment, 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 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. By rationally setting the shape and material of each lens, it helps to ensure high imaging quality and meet the requirements of small size and lightweight design.

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

[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, and R121 are, in order, the radii of curvature 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, respectively, the mirror surfaces furthest from the projection chip DMD. R12, R22, R32, R42, R52, R62, R72, R82, R92, R102, R112, and R122 are, respectively, the radii of curvature 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, closest to the projection chip DMD, in mm. By appropriately setting the range of curvature radii for each lens, it is helpful to ensure high imaging quality and meet miniaturization requirements.

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

[0080]

[0081] Among them, L1~L12 are, in order, 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 gap, and deformation temperature of each lens, it is helpful to ensure high imaging quality, a wide temperature range, and miniaturization requirements.

[0082] In one embodiment, 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, and a plurality of limiting 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 within the fixed lens barrel 102, and the focusing ring 103 is coaxially sleeved outside the fixed lens barrel 102. The fixed lens barrel 102... The focusing ring 103 has several straight grooves 1021 parallel to the optical axis and several curved grooves 1022 perpendicular to the optical axis. The inner wall of the focusing ring 103 has several spiral grooves 1031. The focusing guide pins 501 are connected to the main lens barrel 101 and pass through the straight grooves 1021 on the fixed lens barrel 102, then engage with the spiral grooves 1031 on the focusing ring 103. The limiting pins 502 are connected to the focusing ring 103 and pass through the curved grooves 1022 on the fixed lens barrel 102. When the focusing ring 103 rotates around the optical axis, it drives the main lens barrel 101 to move and focus in a direction parallel to the optical axis. It is easy to understand that the number of focusing guide pins 501 and limiting pins 502 can be selected according to actual needs, such as two of each.

[0083] By ensuring tight tolerances between components and miniaturizing structural deformation within the limits allowed by optical design under varying temperatures, the system achieves good vibration resistance and operational stability, while also facilitating rapid focusing.

[0084] 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 to the fixed lens barrel 102 and connected to a drive gear 6011. The focusing ring 103 is provided with a driven gear 1033. The drive gear 6011 and the driven gear 1033 mesh and, driven by the motor 601, drive the focusing ring 103 to rotate around the optical axis. The motor 601 and the circuit board 602 are also electrically connected to the projection device. Using electrically driven focusing facilitates remote operation and improves convenience and focusing accuracy.

[0085] In one embodiment, the high-definition large-aperture projection lens further includes a connector 104, through which the projection device is detachably connected to the fixed lens barrel 102. This facilitates quick disassembly, maintenance, or replacement.

[0086] Example 1:

[0087] like Figure 1 As shown, the high-definition large-aperture projection lens in this embodiment adopts a glass-plastic hybrid design. Light enters the projection lens from the right projection chip DMD and is projected onto the left screen MB through the projection lens. That is, the projection lens is arranged sequentially from left to right along the reverse direction of light: 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. 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 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. The fourth lens G04 and the fifth lens G05 are bonded together to form the first lens group B01; the eighth lens G08 and the ninth lens G09 are bonded together to form the second lens group B02; and the tenth lens G10 and the eleventh lens G11 are bonded together to form the third lens group B03. In this embodiment, the focal length of the first lens group B01 is -129.506mm, the focal length of the second lens group B02 is 143.723mm, and the focal length of the third lens group B03 is 59.759mm.

[0088] The optical parameters of the above lenses satisfy the following table:

[0089]

[0090] The equations for aspherical surfaces all satisfy the following expression:

[0091]

[0092] In the formula, Z is the sag, c is the curvature, y is the radial coordinate, and k is the coefficient of the conic section. , , , , , , , These are higher-order coefficients for aspherical surfaces.

[0093] The optical parameters of the aspherical lens in this embodiment satisfy the following table:

[0094]

[0095] Where c is the curvature, i.e., 1 / R, and R is the radius of curvature. The first surface corresponds to the radius of curvature of the mirror surface on the lens that is far from the projection chip DMD, and the second surface corresponds to the radius of curvature of the mirror surface on the lens that is close to the projection chip DMD.

[0096] Based on the above parameters, the projection lens in this embodiment can achieve the following performance indicators:

[0097] This projection lens is compatible with a 0.33-inch 1080P resolution projection chip DMD, has a focal length of f8.25mm, an aperture of F1.7, a throw ratio of 1.1, a projection distance of 20 inches to 50 inches, and an overall product size of less than 35mm. 60mm With a diameter of 65mm and a product weight of less than 100 grams, it can meet the requirements of electric intelligent control focusing and projection distance switching.

[0098] Example 2:

[0099] like Figures 2-10 As shown, a high-definition large-aperture projection lens, based on embodiment 1, further includes a main lens barrel 101, a fixed lens barrel 102, a focusing ring 103, several focusing guide pins 501, several limiting pins 502, and several spacers forming a focusing structure. The focusing structure is electrically adjusted via a motor 601 and a circuit board 602. The motor 601 is fixed to the fixed lens barrel 102 and connected to a drive gear 6011. The focusing ring 103 is provided with a driven gear 1033. The drive gear 6011 and the driven gear 1033 mesh and, driven by the motor 601, drive the focusing ring 103 to rotate around the optical axis. The motor 601 and the circuit board 602 are also electrically connected to a projection device, and the projection device is also connected to the fixed lens barrel 102 via a connecting seat 104, making the projection lens an electric projection lens.

[0100] The main lens barrel 101 is used to assemble various lenses and spacers. The inner wall of the main lens barrel 101 is also provided with a boss 1011. The boss 1011 is used to assemble the lenses and spacers into the main lens barrel 101 on both sides, and the boss 1011 is used to ensure the air gap between the ninth lens G09 and the tenth lens G10. The lenses and spacers are assembled into the main lens barrel 101 on both sides. When assembling on the left side, the following are placed in sequence: second lens group B02, sixth spacer 206, seventh lens G07, fifth spacer 205, sixth lens P06, fourth spacer 204, first lens group B01, third spacer 203, third lens G03, second spacer 202, second lens G02, first spacer 201, and first lens P01. When assembling on the right side, the following are placed in sequence: third lens group B03, seventh spacer 207, and twelfth lens G12.

[0101] 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; and the seventh spacer 207 is used to ensure the air gap between the eleventh lens G11 and the twelfth lens G12.

[0102] like Figure 5 and Figure 6 As shown, the inner wall of the main lens barrel 101 is designed with a boss 1011. The outer wall of the main lens barrel 101 has two symmetrically distributed blind holes 1012, as well as a first glue injection port 1013 and a second glue injection port 1014. A third glue injection port 1015 is provided on the end of the main lens barrel 101 near the projection chip DMD. The outer wall of the main lens barrel 101 also has several weight reduction grooves 1016 and several reinforcing ribs 1017. The weight reduction grooves 1016 are designed to reduce glue, that is, to reduce the glue in the overall structure of the main lens barrel 101, especially in the thicker parts, so that the structural thickness is uniform, which facilitates glue injection molding and reduces the risk of shrinkage in some dimensions.

[0103] Figure 7 and Figure 8The simulation diagram of the injection molding flow analysis of the main lens barrel 101 shows that, through the optimized structural design of the main lens barrel 101 by 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, and by substituting the mechanical parameters of the corresponding materials into the simulation of the product structure after injection molding, it can be seen that the material thickness of the main lens barrel 101 is uniformly distributed throughout the injection molding process, and the deformation of the main structure does not affect the assembly of the lens and spacer, and will not affect the main optical and mechanical properties of the lens product.

[0104] 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 from polycarbonate material with 10%~30% glass fiber added, and their material properties meet the following requirements:

[0105]

[0106] like Figure 9 As shown, the sidewall of the fixed lens barrel 102 has two symmetrically distributed straight grooves 1021 parallel to the optical axis and two arcuate grooves 1022 perpendicular to the optical axis. Figure 10 As shown, the inner wall of the focusing ring 103 has two symmetrically distributed spiral grooves 1031, the side wall of the focusing ring 103 has two through holes 1032, and the outer wall of the focusing ring 103 is also provided with a driven gear 1033 and a sensing post 1034.

[0107] like Figure 2 , Figure 5 As shown, the main lens barrel 101 is coaxially built into the fixed lens barrel 102, and the focusing ring 103 is coaxially sleeved on the outside of the fixed lens barrel 102. Two focusing guide pins 501 are 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 spiral groove 1031 on the focusing ring 103 is aligned with the focusing guide pins 501, so that the focusing ring 103 makes a spiral movement on the fixed lens barrel 102. The limiting pin 502 is passed through the through hole 1032 on the focusing ring 103 and fixed. The other end of the limiting pin 502 is placed in the arc groove 1022 of the fixed lens barrel 102.

[0108] The degree of freedom of the limiting pin 502 is restricted as follows: the limiting 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 movement along the optical axis, and the circumferential degree of freedom around the optical axis is restricted by the arc dimension of the arc groove 1022; the degree of freedom of the focusing ring 103 is restricted by the degree of freedom of the limiting pin 502, and the focusing ring 103 can only make circumferential movements on the fixed lens barrel 102 with the optical axis as the reference, and the rotation angle is restricted by the arc dimension of the arc groove 1022 of the fixed lens barrel 102.

[0109] The focusing ring 103's spiral groove 1031, the fixed lens barrel 102's straight groove 1021, and the focusing guide pin 501 cooperate to form a cam structure. This converts the rotational motion of the focusing ring 103 around the optical axis into the linear reciprocating motion of the focusing guide pin 501 parallel to the optical axis. The focusing guide pin 501 then drives the main lens barrel 101 to perform this linear reciprocating motion parallel to the optical axis. This linear reciprocating motion of the main lens barrel 101, in turn, drives each lens to perform linear reciprocating motion along the optical axis. By changing the relative distance between the lens and the projection chip DMD, the focus of the projection lens is adjusted.

[0110] like Figure 3 , Figure 4 As shown, the projection lens is designed with a motor 601, a circuit board 602, and the aforementioned focusing mechanism to form an electronic drive mechanism. The motor 601 is fixed to the fixed lens barrel 102, and a drive gear 6011 on the motor 601 meshes with a driven gear 1033 on the focusing ring 103 to realize the electronic drive mechanism. The rotation of the gear on the motor 601 drives the focusing ring 103 to rotate, thereby causing the main lens barrel 101 to perform a linear reciprocating motion parallel to the optical axis, thus achieving the focusing function of the lens. The circuit board 602 is fixed on the fixed lens barrel 102. The circuit board 602 is designed with two optocouplers, namely the position sensor 6021 and the focusing ring 103 is designed with the sensing post 1034. The optocouplers are distributed in a fan shape on the circuit board 602 with the optical axis as the center. During the rotation of the focusing ring 103, the sensing post 1034 will pass through the optocouplers and block the light signal, thereby cutting off the light signal. The circuit board 602 outputs an electrical signal to the projection device through the conduction and cut-off of the light signal, thereby realizing the real-time feedback of the relative distance between the lens and the projection chip DMD by the projection device through electronic signals.

[0111] like Figure 2 As shown, the motor 601 is designed with a first interface 6012 for connecting one of the wiring ports of the projection device, and the circuit board 602 is designed with a second interface 6022 for connecting the other wiring port of the projection device.

[0112] Among them, motor 601 adopts a stepper control drive method with a step angle of 0.0766° / step, calculated using the gear speed formula:

[0113] n1 / n2=Z2 / Z1

[0114] Formulas for calculating rotational speed and angle:

[0115] rpm=PPS 60 / (360° / ω)

[0116] Where 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 step angle of the motor 601.

[0117] Substituting the pulse speed PPS of motor 601 as 500 steps / second, the step angle ω of motor 601 as 0.0766° / step, the number of teeth of driving gear 6011 as 32, and the number of teeth of driven gear 1033 as 72, we can derive the rotational speed of motor 601 as 6.38 revolutions / minute, the rotational speed of focusing ring 103 as 2.83 revolutions / minute, and the step angle of focusing ring 103 as 0.034° / step. Substituting the lead of the spiral groove 1031 on the focusing ring 103 as 18mm, the stroke for a 0.034° rotation angle is 0.0017mm. That is, when each pulse signal is applied to the motor 601, the driving gear 6011 on the motor 601 drives the driven gear 1033 on the focusing ring 103 to rotate, thereby causing the focusing guide pin 501 to be displaced along the optical axis by 0.0017mm. In other words, the main lens barrel 101 moves along the optical axis, thereby changing the relative distance between the lens and the projection chip DMD by 0.0017mm.

[0118] Through the design of the aforementioned focusing mechanism and electronic drive mechanism, the projection device can adapt to changes in ambient temperature and projection distance, such as temperature changes from -30℃ to +80℃. Different temperature changes will cause changes in the focal plane of the projection lens, resulting in some changes in the projected image. By refocusing, the projection device outputs a pulse signal of the corresponding number of steps to drive the focal plane of the projection lens to change, thereby realizing the automatic focusing and clearing function of the projected image.

[0119] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0120] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A high-definition, large-aperture projection lens, applied to a projection device, the projection device comprising a projection chip (DMD), characterized in that: 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) arranged sequentially along the direction close to the projection chip (DMD). The optical power 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, positive, positive, positive, positive, positive, positive.

2. The high-definition, large-aperture projection lens as described in 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; Wherein, 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), respectively, in mm.

3. The high-definition, large-aperture projection lens as described in claim 2, characterized in that: The first lens group (B01) includes a fourth lens (G04) and a fifth lens (G05) that are sequentially arranged and bonded together 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 bonded together 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 bonded together along the direction close to the projection chip (DMD). The optical powers of the fourth lens (G04), fifth lens (G05), eighth lens (G08), ninth lens (G09), tenth lens (G10), and eleventh lens (G11) are positive, negative, positive, negative, negative, and positive, respectively.

4. The high-definition, large-aperture projection lens as described in 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; Wherein, f4, f5, f8, f9, f10, and f11 are the focal lengths of the fourth lens (G04), fifth lens (G05), eighth lens (G08), ninth lens (G09), tenth lens (G10), and eleventh lens (G11), respectively, in mm.

5. The high-definition, large-aperture projection lens as described in claim 3, characterized in that: 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 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 described 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, in order, the radii of curvature of the mirror surfaces 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 furthest from the projection chip (DMD). R22, R32, R42, R52, R62, R72, R82, R92, R102, R112, and R122 are, in order, the radii of curvature of the mirror surfaces 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) near the projection chip (DMD), in mm.

7. The high-definition, large-aperture projection lens as described in claim 3, characterized in that: The high-definition, large-aperture projection lens also meets the following conditions: ; Among them, L1~L12 are, in order, 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 as described in claim 1, characterized in that: The high-definition large-aperture projection lens also includes a main lens barrel (101), a fixed lens barrel (102), a focusing ring (103), several focusing guide pins (501), and several limiting 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 inside the fixed lens barrel (102), and the focusing ring (103) is coaxially sleeved outside the fixed lens barrel (102). The focusing ring (103) has several straight grooves (1021) parallel to the optical axis and several arc grooves (1022) perpendicular to the optical axis. The inner wall of the focusing ring (103) has several spiral grooves (1031). The focusing guide pin (501) is connected to the main lens barrel (101) and passes through the straight grooves (1021) on the fixed lens barrel (102) one by one, and then cooperates with the spiral grooves (1031) on the focusing ring (103) one by one. The limiting pin (502) is connected to the focusing ring (103) and passes through the arc grooves (1022) on the fixed lens barrel (102) one by one. When the focusing ring (103) rotates around the optical axis, it drives the main lens barrel (101) to move and focus in a direction parallel to the optical axis.

9. The high-definition large-aperture projection lens as described in claim 8, characterized in that: The high-definition large aperture projection lens also includes a motor (601) and a circuit board (602). The motor (601) is fixed on the fixed lens barrel (102) and connected to a drive gear (6011). The focusing ring (103) is provided with a driven gear (1033). The drive gear (6011) and the driven gear (1033) mesh and drive 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 electrically connected to the projection device.

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

Images