WO2023070810A1 - Projection lens and projection device - Google Patents

Projection lens and projection device Download PDF

Info

Publication number
WO2023070810A1
WO2023070810A1 PCT/CN2021/133862 CN2021133862W WO2023070810A1 WO 2023070810 A1 WO2023070810 A1 WO 2023070810A1 CN 2021133862 W CN2021133862 W CN 2021133862W WO 2023070810 A1 WO2023070810 A1 WO 2023070810A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
projection
focal length
convex
group
Prior art date
Application number
PCT/CN2021/133862
Other languages
French (fr)
Chinese (zh)
Inventor
郭飞
Original Assignee
歌尔光学科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 歌尔光学科技有限公司 filed Critical 歌尔光学科技有限公司
Publication of WO2023070810A1 publication Critical patent/WO2023070810A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details

Definitions

  • the present application relates to the technical field of projection imaging, in particular to a projection lens and a projection device.
  • HUD Head Up Display
  • Chinese name is head up display. It was originally used in the auxiliary driving system of aircraft. At this stage, with the development of technology and the improvement of safety awareness, it has been widely used in vehicles.
  • HUD can project current speed, navigation and other information onto the photoelectric display device on the windshield, forming an image in front of the glass. Drivers can see navigation and vehicle speed information without turning their heads or looking down.
  • the requirements of the projection imaging system are higher than those of the traditional projection imaging system: due to the bumpy driving of the vehicle, the HUD projection lens needs to have higher stability, while the traditional projection lens Difficult to satisfy.
  • the main purpose of this application is to propose a projection lens and a projection device, aiming at reducing the tolerance sensitivity of the projection lens assembly, reducing the difficulty of assembling the projection lens, and maintaining a clear image in an environment with slight vibrations.
  • the present application proposes a projection lens, which sequentially includes along the same optical axis from the enlargement side to the reduction side:
  • a fifth lens the fifth lens has positive refractive power, and the opposite surfaces of the fourth lens and the fifth lens are glued to each other;
  • the first lens, the second lens and the third lens form a front lens group, and the front lens group has negative refractive power; the fourth lens, the fifth lens and the sixth lens form a rear lens group, so The rear lens group has positive optical power.
  • the surface of the first lens facing the enlargement side is convex, and the surface facing the reduction side is convex;
  • the surface of the second lens toward the enlargement side is convex, and the surface toward the reduction side is concave;
  • the surface of the third lens toward the enlargement side is convex, and the surface toward the reduction side is concave;
  • the surface of the fourth lens toward the enlargement side is concave, and the surface toward the reduction side is concave;
  • the surface of the fifth lens toward the enlargement side is convex, and the surface toward the reduction side is convex;
  • the surface of the sixth lens facing the enlargement side is convex
  • the surface of the sixth lens facing the reduction side is convex
  • the focal length of the projection lens is f00, 30mm ⁇ f00 ⁇ 36mm; and/or,
  • the focal length of the front lens group is f11, -357mm ⁇ f11 ⁇ -347mm;
  • the focal length of the rear lens group is f22, 14mm ⁇ f22 ⁇ 20mm.
  • the focal length of the first lens is f1, 33mm ⁇ f1 ⁇ 39mm;
  • the focal length of the second lens is f2, -46mm ⁇ f2 ⁇ -38mm;
  • the focal length of the third lens is f3, -14mm ⁇ f3 ⁇ -8mm;
  • the focal length of the fourth lens is f4, -29mm ⁇ f4 ⁇ -23mm;
  • the focal length of the fifth lens is f5, 20mm ⁇ f5 ⁇ 24mm;
  • the focal length of the sixth lens is f6, 25mm ⁇ f6 ⁇ 31mm; and/or,
  • the focal length of the doublet lens formed by the fourth lens and the fifth lens is f4/5, 43mm ⁇ f4/5 ⁇ 50mm.
  • the projection lens also includes:
  • a diaphragm, the diaphragm is arranged between the front lens group and the rear lens group.
  • the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical lenses.
  • the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all made of optical glass.
  • the present application also proposes a projection device, the projection device includes an image source and the projection lens according to any one of the above embodiments, the image source is set at the sixth lens away from the first One side of five lenses.
  • the projection device also includes:
  • a turning prism, the turning prism is arranged between the sixth lens and the image source.
  • the projection device also includes:
  • a transparent protective layer, the transparent protective layer is arranged on the side of the image source facing the sixth lens.
  • the projection lens sequentially includes a first lens with positive power, a second lens with negative power, a third lens with negative power, and a lens with negative power along the same optical axis from the magnifying side to the reducing side.
  • the fourth lens, the fifth lens with positive refractive power and the sixth lens with positive refractive power, and the front lens group composed of the first lens, the second lens and the third lens have negative refractive power, the fourth lens, the fifth lens
  • the rear lens group composed of the lens and the sixth lens has negative optical power.
  • FIG. 1 is a schematic structural diagram of an embodiment of a projection device of the present application
  • Fig. 2 is a schematic diagram of light transmission of the projection device in Fig. 1;
  • Fig. 3 is a field curvature diagram and a distortion diagram of the projection device of Fig. 1;
  • Fig. 4 is a modulation transfer function diagram of the projection device of Fig. 1;
  • Fig. 5 is a diagram of the defocus modulation transfer function of the projection device of Fig. 1;
  • FIG. 6 is a relative illuminance diagram of the projection device in FIG. 1 .
  • This application proposes a projection lens.
  • the projection lens sequentially includes along the same optical axis from the enlargement side to the reduction side: a first lens 10 having a positive refractive power; a second lens 20, the second lens 20 has a negative power; the third lens 30, the third lens 30 has a negative power; the fourth lens 40, the fourth lens 40 has a negative power; the fifth Lens 50, the fifth lens 50 has positive refractive power, and the opposite surfaces of the fourth lens 40 and the fifth lens 50 are cemented together; the sixth lens 60, the sixth lens 60 has positive refractive power; Wherein, the first lens 10, the second lens 20 and the third lens 30 form a front lens group, and the front lens group has negative refractive power; the fourth lens 40, the fifth lens 50 and the sixth lens 60 A rear lens group is formed, and the rear lens group has positive optical power.
  • the reduction side is the side where the image source 80 (such as a DMD chip) generating projection light is located during the projection process (as shown at B in the figure), that is, the image side; the enlargement side is the projection process, The side where the projection surface (such as a projection screen) for displaying projected images is located (as shown at A in the figure), that is, the object side.
  • the transmission direction of the projection light is from the reduction side to the enlargement side.
  • an image source 80 is also provided on the side of the sixth lens 60 away from the fifth lens 50, and the projection light is emitted from the image source 80, from the reduction side to the enlargement side. Emitted, sequentially through the sixth lens 60, the fifth lens 50 and the fourth lens 40 (the two are cemented to form a doublet lens), the third lens 30, the second lens 20 and the first lens 10, and finally output to the 10 on the projection surface on the side away from the second lens 20, so as to display the projected image.
  • the focal power is the difference between the convergence degree of the image beam and the object beam convergence, which represents the ability of the optical system to deflect light.
  • a negative power lens is a kind of lens with a thin center and a thick periphery, also known as a concave lens, which has the function of diverging light;
  • a positive power lens is a kind of lens with a thick center and a thin periphery, also known as a convex lens, which has the function of converging light .
  • the projection lens sequentially includes a first lens 10 of positive refractive power, a second lens 20 of negative refractive power, a third lens 30 of negative refractive power, a negative
  • the fourth lens 40 of refractive power, the fifth lens 50 of positive refractive power and the sixth lens 60 of positive refractive power, and the front lens group composed of the first lens 10, the second lens 20 and the third lens 30 have negative light focal power
  • the rear lens group composed of the fourth lens 40, the fifth lens 50 and the sixth lens 60 has a negative refractive power
  • the defocus MTF range of the projection lens is relatively large, and it has a relatively large
  • the large tolerance reduces the tolerance sensitivity of the projection lens assembly, reduces the difficulty of assembling the projection lens, and can maintain a clear image in an environment with slight vibrations, and has high stability. It is suitable for use in vehicle-mounted HUD projection imaging systems.
  • the projection lens of the present application has a small number of lenses, a
  • the surface of the first lens 10 facing the enlargement side is convex, and the surface facing the reduction side is convex; the surface of the second lens 20 facing the enlargement side is convex.
  • the surface toward the reduction side is concave;
  • the surface of the third lens 30 toward the enlargement side is convex, and the surface toward the reduction side is concave;
  • the surface of the fourth lens 40 toward the enlargement side is concave, and the surface toward the reduction side
  • the surface of the fifth lens 50 toward the enlargement side is convex, and the surface toward the reduction side is convex;
  • the surface of the sixth lens 60 toward the enlargement side is convex, and the surface toward the reduction side is convex.
  • the first lens 10 is a biconvex lens with positive power
  • the second lens 20 is a meniscus lens with negative power
  • the third lens 30 is a meniscus lens with negative power.
  • Lens the fourth lens 40 has a biconcave lens with a negative focal length
  • the fifth lens 50 has a biconvex lens with a negative refractive power
  • the fourth lens 40 and the fifth lens 50 are a doublet lens combined together.
  • the six lenses 60 are biconvex lenses with positive refractive power.
  • the focal length of the projection lens is f00, 30mm ⁇ f00 ⁇ 36mm; and/or, the focal length of the front lens group is f11, -357mm ⁇ f11 ⁇ -347mm; the rear lens group The focal length is f22, 14mm ⁇ f22 ⁇ 20mm.
  • the tolerance sensitivity of the projection lens assembly can be further reduced, the difficulty of assembling the projection lens can be reduced, and the imaging can be kept clear and stable in an environment with slight vibrations, which is suitable for application in a vehicle-mounted HUD projection imaging system.
  • the focal length of the first lens 10 is f1, 33mm ⁇ f1 ⁇ 39mm; the focal length of the second lens 20 is f2, -46mm ⁇ f2 ⁇ -38mm; the third lens 30
  • the focal length of the lens is f3, -14mm ⁇ f3 ⁇ -8mm;
  • the focal length of the fourth lens 40 is f4, -29mm ⁇ f4 ⁇ -23mm;
  • the focal length of the fifth lens 50 is f5, 20mm ⁇ f5 ⁇ 24mm;
  • the focal length of the sixth lens 60 is f6, 25mm ⁇ f6 ⁇ 31mm; and/or, the focal length of the doublet lens formed by the fourth lens 40 and the fifth lens 50 is f4/5, 43mm ⁇ f4/5 ⁇ 50mm.
  • the tolerance sensitivity of the projection lens assembly can be further reduced, the difficulty of assembling the projection lens can be reduced, and the imaging can be kept clear and stable in an environment with slight vibrations, which is suitable for application in a vehicle-mounted HUD projection imaging system.
  • the two optical indicators of the projection lens of the present application MTF and relative illuminance, can reach the standard, which can meet the needs of use without additional vignetting. Without vignetting, its light transmission efficiency It will be higher, so that the projection lens has a higher relative illuminance, less light energy is lost at the edge, and can effectively improve the utilization rate of illumination light energy, thereby improving the brightness and uniformity of the imaging image of the projection lens.
  • the projection lens further includes: an aperture 70 disposed between the front lens group and the rear lens group.
  • the diaphragm 70 is specifically an aperture diaphragm 70, and the diaphragm 70 is used to limit the diameter of the projected light passing through, adjust the luminous flux exiting the projection lens, and reduce the interference of stray light generated by reflection of other lenses, so that the imaging of the projected light is clearer .
  • the aperture of the aperture 70 is a fixed value.
  • the aperture 70 can also be set in a manner that can adjust the aperture size.
  • the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50 and the sixth lens 60 are all for spherical lenses.
  • the six lenses of the projection lens are all spherical lenses, and no aspherical lenses are added, which can effectively reduce the processing difficulty and production cost of the lenses.
  • the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50 and the sixth lens 60 are all Made of optical glass.
  • the vehicle When the projection lens is applied to the HUD projection light machine and assembled into the vehicle, compared with indoor projection, the vehicle is in a working environment with a larger operating temperature fluctuation range, which causes the projection lens to withstand a large amount of light irradiation, and the light energy will be partially Converted into heat energy, if the lens is made of ordinary optical plastic materials, it is greatly affected by temperature and is prone to temperature drift.
  • all six lenses are made of glass material, which can adapt to a relatively large working temperature range, has small temperature drift, and can effectively solve the thermal out-of-focus problem of plastic lenses caused by heat.
  • Table 1 This application illustrates the surface type, radius of curvature and thickness of each lens, as well as the glass material (refractive index and Abbe number) and semi-aperture of each lens. Wherein, the thickness at the space between two adjacent lenses is represented as the distance between two adjacent lenses.
  • the result obtained by non-paraxial ray tracing is inconsistent with the result obtained by paraxial ray tracing, and the deviation from the ideal state of Gaussian optics (the first approximation theory or paraxial ray) is called aberration.
  • Aberrations are mainly divided into distortion, field curvature, chromatic aberration, spherical aberration, coma, astigmatism, etc. Aberration will affect the imaging quality of the projection lens. Therefore, when designing the projection lens, it is necessary to eliminate the aberration generated by the imaging of the optical system as much as possible.
  • the doublet lens composed of the fourth lens 40 and the fifth lens 50 can effectively reduce the chromatic aberration generated in the optical imaging process; and, through the combination of six lenses, they can effectively reduce distortion, field curvature and other aberrations , so as to ensure the image quality.
  • the first lens 10 by setting the first lens 10 to have the largest aperture among the six lenses, the apertures of the third lens 30, the second lens 20, and the first lens 10 are sequentially increased, so that a larger field of view range can be realized, so that the driver can obtain Better look and feel.
  • the throw ratio of the projection lens is 3, where the throw ratio refers to the ratio of the projection distance to the width of the projection screen.
  • the aperture ratio refers to the ratio of the focal length to the aperture diameter.
  • the field of view FOV of the projection lens is 12°.
  • the field of view is also called the field of view in optical engineering. The size of the field of view determines the field of view of the optical instrument.
  • the field of view can be represented by FOV.
  • Figure 3 is the field curvature and distortion diagram of the projection lens, where the field curvature refers to the curvature of the image field, which is mainly used for Indicates the degree of non-coincidence between the intersection point of the entire beam and the ideal image point in the optical component; distortion refers to the aberration of different magnifications in different parts of the object when the object is imaged through the optical component, and the distortion will lead to deterioration of the similarity of the object image , but does not affect the sharpness of the image. It can be seen from FIG. 3 that in the projection lens of this embodiment, the distortion is less than 1%, which will not affect the viewing experience of the driver.
  • Figure 4 is the modulation transfer function diagram of each field of view chip surface of the projection lens, that is, the MTF (ModulationTransferFunction) diagram.
  • the MTF diagram is used to refer to the relationship between the modulation degree and the number of lines per millimeter in the image. The relationship between them is used to evaluate the ability to restore the details of the scene.
  • the projection angle is the frequency coordinate between samples of the field of view, and the ordinate is the MTF value of the transfer function. It can be seen from FIG. 4 that in the projection lens of this embodiment, the average MTF of each field of view is >0.6, and the imaging is good.
  • Figure 5 is the defocus MTF diagram of the projection lens, that is, the change of MTF value with the defocus distance. It can be seen from FIG. 5 that in the projection lens of this embodiment, the MTF>0.3 defocus range is greater than ⁇ 0.02mm, which shows that it has a larger defocus range and can adapt to unstable driving environments.
  • Figure 6 is the relative illuminance diagram of the projection lens, where the relative illuminance refers to the ratio of the illuminance at different coordinate points on the image plane to the illuminance at the center point. It can be seen from Fig. 6 that in the projection lens of this embodiment, the illuminance relative to the center of the most edge is >95%, indicating that the brightness of the imaging picture of the projection lens is uniform, the loss of light energy at the edge is small, and the utilization rate of light energy can be improved, which is good for the driver. look and feel.
  • the present application also proposes a projection device 100, please refer to FIGS. All the technical solutions of the above-mentioned embodiments, therefore at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be repeated here.
  • the image source 80 is disposed on a side of the sixth lens 60 away from the fifth lens 50 .
  • the image source 80 can be a digital micromirror device (Digital Micromirror Device, DMD) chip.
  • DMD Digital Micromirror Device
  • DMD is composed of many digital micro-mirrors arranged in a matrix. When working, each micro-mirror can be deflected and locked in two directions, so that the light is projected in a predetermined direction, and at a frequency of tens of thousands of hertz Swing, the light beam from the illumination source is reflected by the flip of the micro-mirror into the projection lens and imaged on the screen.
  • DMD has the advantages of high resolution and no need for digital-to-analog conversion of signals.
  • the image source 80 can also be a Liquid Crystal On Silicon (LCOS) chip or other display elements that can emit light.
  • LCOS Liquid Crystal On Silicon
  • This application selects 0.55-inch DMD as the light-emitting chip for lens imaging design.
  • the projection device 100 further includes: a turning prism 90 disposed between the sixth lens 60 and the image source 80 .
  • image source 80 sometimes needs to be passively illuminated. Therefore, it is necessary to provide additional illumination to the image source 80 by means of an external light source and the turning prism 90 .
  • the prism can be a right-angle prism, the slope of the right-angle prism faces the image source 80, and one of the right-angle faces of the right-angle prism faces the sixth lens 60.
  • the light source corresponds to the slope of the right-angle prism, and the slope of the right-angle prism is provided with a semipermeable membrane.
  • the external light source When in use, the external light source emits illuminating light, shoots to the slope of the right-angle prism, and shoots to the image source 80 after being reflected by the semi-reflective and semi-transparent film, thereby providing light for the image source 80.
  • the film After the film is transmitted, it emits to the sixth lens 60, and passes through the sixth lens 60, the fifth lens 50, the fourth lens 40, the third lens 30, the second lens 20 and the first lens 10 in sequence, thereby displaying on the projection screen. projected image.
  • the projection device 100 further includes: a transparent protective layer 81 , and the transparent protective layer 81 is disposed on a side of the image source 80 facing the sixth lens 60 . side.
  • the transparent protective layer 81 is specifically a cover glass, the thickness of the cover glass is 1.1mm, and the cover glass is set on the light-emitting surface of the image source 80, which can ensure a good light transmittance. , effectively protect the image source 80, prevent external dust from entering the image source 80, and also prevent other lenses in the projection lens from bumping the image source 80 due to vibration, and protect the image source 80 from the impact of the external environment or other components .

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

A projection lens and a projection device. The projection lens sequentially comprises, from a magnification side to a reduction side along the same optical axis, a first lens (10), a second lens (20), a third lens (30), a fourth lens (40), a fifth lens (50), and a sixth lens (60), wherein opposite surfaces of the fourth lens (40) and the fifth lens (50) are glued to each other; the first lens (10), the fifth lens (50), and the sixth lens (60) each have a positive focal power, and the second lens (20), the third lens (30), and the fourth lens (40) each have a negative focal power; the first lens (10), the second lens (20), and the third lens (30) form a front lens group, and the front lens group has a negative focal power; and the fourth lens (40), the fifth lens (50), and the sixth lens (60) form a rear lens group, and the rear lens group has a positive focal power. According to the above projection lens, the tolerance sensitivity of assembly of the projection lens can be reduced, the assembly difficulty of the projection lens is reduced, and clear imaging is ensured in an environment featuring tiny vibrations.

Description

投影镜头及投影装置Projection lens and projection device
本申请要求于2021年10月29日提交中国专利局、申请号为202111279329.2、申请名称为“投影镜头及投影装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application with the application number 202111279329.2 and the application title "Projection Lens and Projection Device" submitted to the China Patent Office on October 29, 2021, the entire contents of which are incorporated herein by reference.
技术领域technical field
本申请涉及投影成像技术领域，特别涉及一种投影镜头及投影装置。The present application relates to the technical field of projection imaging, in particular to a projection lens and a projection device.
背景技术Background technique
HUD全称Head Up Display，中文名抬头显示，其最初应用于飞机的辅助驾驶***中，现阶段随着技术的发展和安全意识的提高，已广泛应用于车辆中。HUD可以把当前时速、导航等信息投影到挡风玻璃上的光电显示装置上，在玻璃前方形成影像。驾驶员不用转头、低头就能看到导航、车速信息。The full name of HUD is Head Up Display, and the Chinese name is head up display. It was originally used in the auxiliary driving system of aircraft. At this stage, with the development of technology and the improvement of safety awareness, it has been widely used in vehicles. HUD can project current speed, navigation and other information onto the photoelectric display device on the windshield, forming an image in front of the glass. Drivers can see navigation and vehicle speed information without turning their heads or looking down.
HUD成像***因使用环境为不稳定的行驶车辆中，其投影成像***要求相比于传统投影成像***要求更高：因车辆行驶颠簸，HUD投影镜头需具备较高的稳定性，而传统投影镜头难以满足。Due to the unstable driving environment of the HUD imaging system, the requirements of the projection imaging system are higher than those of the traditional projection imaging system: due to the bumpy driving of the vehicle, the HUD projection lens needs to have higher stability, while the traditional projection lens Difficult to satisfy.
申请内容application content
本申请的主要目的是提出一种投影镜头及投影装置，旨在降低投影镜头装配的公差敏感度，降低投影镜头的组装难度，并在存在微小震动的环境中保持成像清晰。The main purpose of this application is to propose a projection lens and a projection device, aiming at reducing the tolerance sensitivity of the projection lens assembly, reducing the difficulty of assembling the projection lens, and maintaining a clear image in an environment with slight vibrations.
为实现上述目的，本申请提出一种投影镜头，所述投影镜头由放大侧至缩小侧沿同一光轴依次包括：In order to achieve the above object, the present application proposes a projection lens, which sequentially includes along the same optical axis from the enlargement side to the reduction side:
第一透镜，所述第一透镜具有正光焦度；a first lens having positive optical power;
第二透镜，所述第二透镜具有负光焦度；a second lens having negative optical power;
第三透镜，所述第三透镜具有负光焦度；a third lens having negative optical power;
第四透镜，所述第四透镜具有负光焦度；a fourth lens having negative optical power;
第五透镜，所述第五透镜具有正光焦度，且所述第四透镜和所述第五透镜相对的表面相互胶合；A fifth lens, the fifth lens has positive refractive power, and the opposite surfaces of the fourth lens and the fifth lens are glued to each other;
第六透镜，所述第六透镜具有正光焦度；a sixth lens having positive optical power;
其中，所述第一透镜、第二透镜和第三透镜组成前镜头组，所述前镜头组具有负光焦度；所述第四透镜、第五透镜和第六透镜组成后镜头组，所述后镜头组具有正光焦度。Wherein, the first lens, the second lens and the third lens form a front lens group, and the front lens group has negative refractive power; the fourth lens, the fifth lens and the sixth lens form a rear lens group, so The rear lens group has positive optical power.
可选地，所述第一透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面；Optionally, the surface of the first lens facing the enlargement side is convex, and the surface facing the reduction side is convex;
所述第二透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凹面；The surface of the second lens toward the enlargement side is convex, and the surface toward the reduction side is concave;
所述第三透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凹面；The surface of the third lens toward the enlargement side is convex, and the surface toward the reduction side is concave;
所述第四透镜朝向放大侧的表面为凹面，朝向缩小侧的表面为凹面；The surface of the fourth lens toward the enlargement side is concave, and the surface toward the reduction side is concave;
所述第五透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面；The surface of the fifth lens toward the enlargement side is convex, and the surface toward the reduction side is convex;
所述第六透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面。The surface of the sixth lens facing the enlargement side is convex, and the surface of the sixth lens facing the reduction side is convex.
可选地，所述投影镜头的焦距为f00，30mm<f00<36mm；和/或，Optionally, the focal length of the projection lens is f00, 30mm<f00<36mm; and/or,
所述前镜头组的焦距为f11，-357mm<f11<-347mm；The focal length of the front lens group is f11, -357mm<f11<-347mm;
所述后镜头组的焦距为f22，14mm<f22<20mm。The focal length of the rear lens group is f22, 14mm<f22<20mm.
可选地，所述第一透镜的焦距为f1，33mm<f1<39mm；Optionally, the focal length of the first lens is f1, 33mm<f1<39mm;
所述第二透镜的焦距为f2，-46mm<f2<-38mm；The focal length of the second lens is f2, -46mm<f2<-38mm;
所述第三透镜的焦距为f3，-14mm<f3<-8mm；The focal length of the third lens is f3, -14mm<f3<-8mm;
所述第四透镜的焦距为f4，-29mm<f4<-23mm；The focal length of the fourth lens is f4, -29mm<f4<-23mm;
所述第五透镜的焦距为f5，20mm<f5<24mm；The focal length of the fifth lens is f5, 20mm<f5<24mm;
所述第六透镜的焦距为f6，25mm<f6<31mm；和/或，The focal length of the sixth lens is f6, 25mm<f6<31mm; and/or,
所述第四透镜和所述第五透镜形成的双胶合透镜的焦距为f4/5，43mm<f4/5<50mm。The focal length of the doublet lens formed by the fourth lens and the fifth lens is f4/5, 43mm<f4/5<50mm.
可选地，所述投影镜头还包括：Optionally, the projection lens also includes:
光阑，所述光阑设于所述前镜头组和所述后镜头组之间。A diaphragm, the diaphragm is arranged between the front lens group and the rear lens group.
可选地，所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜、所述第五透镜以及所述第六透镜均为球面透镜。Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical lenses.
可选地，所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜、所述第五透镜以及所述第六透镜均为光学玻璃材质。Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all made of optical glass.
为实现上述目的，本申请还提出一种投影装置，所述投影装置包括图像源以及如上实施例中任一项所述的投影镜头，所述图像源设于所述第六透镜背离 所述第五透镜的一侧。In order to achieve the above purpose, the present application also proposes a projection device, the projection device includes an image source and the projection lens according to any one of the above embodiments, the image source is set at the sixth lens away from the first One side of five lenses.
可选地，所述投影装置还包括：Optionally, the projection device also includes:
转折棱镜，所述转折棱镜设于所述第六透镜和所述图像源之间。A turning prism, the turning prism is arranged between the sixth lens and the image source.
可选地，所述投影装置还包括：Optionally, the projection device also includes:
透明保护层，所述透明保护层设于所述图像源朝向所述第六透镜的一侧。A transparent protective layer, the transparent protective layer is arranged on the side of the image source facing the sixth lens.
本申请技术方案中，投影镜头由放大侧至缩小侧沿同一光轴依次包括正光焦度的第一透镜、负光焦度的第二透镜、负光焦度的第三透镜、负光焦度的第四透镜、正光焦度的第五透镜以及正光焦度的第六透镜，且第一透镜、第二透镜和第三透镜组成的前镜头组具有负光焦度，第四透镜、第五透镜和第六透镜组成的后镜头组具有负光焦度，通过投影镜头中各个透镜的合理配置，投影镜头的离焦MTF范围较大，具有较大容差，降低了投影镜头装配的公差敏感度，可降低投影镜头的组装难度，并能够在存在微小震动的环境中保持成像清晰，稳定性较高，适合应用于车载HUD投影成像***中，且本申请的投影镜头的透镜数目少、结构紧凑，整体尺寸小。In the technical solution of the present application, the projection lens sequentially includes a first lens with positive power, a second lens with negative power, a third lens with negative power, and a lens with negative power along the same optical axis from the magnifying side to the reducing side. The fourth lens, the fifth lens with positive refractive power and the sixth lens with positive refractive power, and the front lens group composed of the first lens, the second lens and the third lens have negative refractive power, the fourth lens, the fifth lens The rear lens group composed of the lens and the sixth lens has negative optical power. Through the reasonable configuration of each lens in the projection lens, the defocus MTF range of the projection lens is large, and it has a large tolerance, which reduces the tolerance sensitivity of the projection lens assembly. It can reduce the difficulty of assembling the projection lens, and can keep the image clear in the environment with slight vibration, and has high stability. Compact and small overall size.
附图说明Description of drawings
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一部分附图，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only The accompanying drawings are a part of this application. For those skilled in the art, other drawings can be obtained according to the provided drawings without creative work.
图1为本申请投影装置一实施例的结构示意图；FIG. 1 is a schematic structural diagram of an embodiment of a projection device of the present application;
图2为图1投影装置的光线传输示意图；Fig. 2 is a schematic diagram of light transmission of the projection device in Fig. 1;
图3为图1投影装置的场曲图与畸变图；Fig. 3 is a field curvature diagram and a distortion diagram of the projection device of Fig. 1;
图4为图1投影装置的调制传递函数图；Fig. 4 is a modulation transfer function diagram of the projection device of Fig. 1;
图5为图1投影装置的离焦调制传递函数图；Fig. 5 is a diagram of the defocus modulation transfer function of the projection device of Fig. 1;
图6为图1投影装置的相对照度图。FIG. 6 is a relative illuminance diagram of the projection device in FIG. 1 .
附图标号说明：Explanation of reference numbers:
标号label 名称name 标号label 名称name
100100 投影装置 projection device 6060 第六透镜 sixth lens
1010 第一透镜 first lens 7070 光阑 aperture
2020 第二透镜 second lens 8080 图像源 image source
3030 第三透镜 third lens 8181 透明保护层transparent protective layer
4040 第四透镜 fourth lens 9090 转折棱镜 turning prism
5050 第五透镜fifth lens  the  the
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The following will describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
需要说明，若本申请实施例中有涉及方向性指示(诸如上、下、左、右、前、后……)，则该方向性指示仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiment of the present application, the directional indications are only used to explain the position in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
另外，若本申请实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes, and cannot be interpreted as indications or hints Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present application.
本申请提出一种投影镜头。This application proposes a projection lens.
在本申请实施例中，如图1至2所示，该投影镜头由放大侧至缩小侧沿同一光轴依次包括：第一透镜10，所述第一透镜10具有正光焦度；第二透镜20，所述第二透镜20具有负光焦度；第三透镜30，所述第三透镜30具有负光焦度； 第四透镜40，所述第四透镜40具有负光焦度；第五透镜50，所述第五透镜50具有正光焦度，且所述第四透镜40和所述第五透镜50相对的表面相互胶合；第六透镜60，所述第六透镜60具有正光焦度；其中，所述第一透镜10、第二透镜20和第三透镜30组成前镜头组，所述前镜头组具有负光焦度；所述第四透镜40、第五透镜50和第六透镜60组成后镜头组，所述后镜头组具有正光焦度。In the embodiment of the present application, as shown in Figures 1 to 2, the projection lens sequentially includes along the same optical axis from the enlargement side to the reduction side: a first lens 10 having a positive refractive power; a second lens 20, the second lens 20 has a negative power; the third lens 30, the third lens 30 has a negative power; the fourth lens 40, the fourth lens 40 has a negative power; the fifth Lens 50, the fifth lens 50 has positive refractive power, and the opposite surfaces of the fourth lens 40 and the fifth lens 50 are cemented together; the sixth lens 60, the sixth lens 60 has positive refractive power; Wherein, the first lens 10, the second lens 20 and the third lens 30 form a front lens group, and the front lens group has negative refractive power; the fourth lens 40, the fifth lens 50 and the sixth lens 60 A rear lens group is formed, and the rear lens group has positive optical power.
需要说明的是，缩小侧为投影过程中，生成投影光线的图像源80(比如DMD芯片)所在的一侧(如图中B处所示)，也即像方；放大侧为投影过程中，用于显示投影图像的投影面(比如投影屏幕)所在的一侧(如图中A处所示)，也即物方。投影光线的传输方向为由缩小侧至放大侧。It should be noted that the reduction side is the side where the image source 80 (such as a DMD chip) generating projection light is located during the projection process (as shown at B in the figure), that is, the image side; the enlargement side is the projection process, The side where the projection surface (such as a projection screen) for displaying projected images is located (as shown at A in the figure), that is, the object side. The transmission direction of the projection light is from the reduction side to the enlargement side.
具体地，本申请的投影镜头应用于投影装置100中时，在第六透镜60背离第五透镜50的一侧还设有图像源80，投影光线由图像源80发出，自缩小侧朝放大侧发射，依次经过第六透镜60、第五透镜50和第四透镜40(二者胶合形成双胶合透镜)、第三透镜30、第二透镜20以及第一透镜10，最终输出至位于第一透镜10背离第二透镜20一侧的投影面上，从而显示出投影图像。Specifically, when the projection lens of the present application is applied to the projection device 100, an image source 80 is also provided on the side of the sixth lens 60 away from the fifth lens 50, and the projection light is emitted from the image source 80, from the reduction side to the enlargement side. Emitted, sequentially through the sixth lens 60, the fifth lens 50 and the fourth lens 40 (the two are cemented to form a doublet lens), the third lens 30, the second lens 20 and the first lens 10, and finally output to the 10 on the projection surface on the side away from the second lens 20, so as to display the projected image.
其中，光焦度为像方光束会聚度与物方光束会聚度之差，表征光学***偏折光线的能力。负光焦度透镜是中间薄、周边厚的一种透镜，又称凹透镜，具有发散光线的作用；正光焦度透镜是中间厚、周边薄的一种透镜，又称凸透镜，具有汇聚光线的作用。Among them, the focal power is the difference between the convergence degree of the image beam and the object beam convergence, which represents the ability of the optical system to deflect light. A negative power lens is a kind of lens with a thin center and a thick periphery, also known as a concave lens, which has the function of diverging light; a positive power lens is a kind of lens with a thick center and a thin periphery, also known as a convex lens, which has the function of converging light .
本申请技术方案中，投影镜头由放大侧至缩小侧沿同一光轴依次包括正光焦度的第一透镜10、负光焦度的第二透镜20、负光焦度的第三透镜30、负光焦度的第四透镜40、正光焦度的第五透镜50以及正光焦度的第六透镜60，且第一透镜10、第二透镜20和第三透镜30组成的前镜头组具有负光焦度，第四透镜40、第五透镜50和第六透镜60组成的后镜头组具有负光焦度，通过投影镜头中各个透镜的合理配置，投影镜头的离焦MTF范围较大，具有较大容差，降低了投影镜头装配的公差敏感度，可降低投影镜头的组装难度，并能够在存在微小震动的环境中保持成像清晰，稳定性较高，适合应用于车载HUD投影成像***中，且本申请的投影镜头的透镜数目少、结构紧凑，整体尺寸小。In the technical solution of the present application, the projection lens sequentially includes a first lens 10 of positive refractive power, a second lens 20 of negative refractive power, a third lens 30 of negative refractive power, a negative The fourth lens 40 of refractive power, the fifth lens 50 of positive refractive power and the sixth lens 60 of positive refractive power, and the front lens group composed of the first lens 10, the second lens 20 and the third lens 30 have negative light focal power, the rear lens group composed of the fourth lens 40, the fifth lens 50 and the sixth lens 60 has a negative refractive power, through the rational configuration of each lens in the projection lens, the defocus MTF range of the projection lens is relatively large, and it has a relatively large The large tolerance reduces the tolerance sensitivity of the projection lens assembly, reduces the difficulty of assembling the projection lens, and can maintain a clear image in an environment with slight vibrations, and has high stability. It is suitable for use in vehicle-mounted HUD projection imaging systems. Moreover, the projection lens of the present application has a small number of lenses, a compact structure, and a small overall size.
在可选的实施方式中，请参阅图1至2，所述第一透镜10朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面；所述第二透镜20朝向放大侧的表面为凸面，朝向缩小侧的表面为凹面；所述第三透镜30朝向放大侧的表面为凸面，朝向缩小侧的表面为凹面；所述第四透镜40朝向放大侧的表面为凹面，朝向缩小侧的表面为凹面；所述第五透镜50朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面；所述第六透镜60朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面。In an optional embodiment, referring to FIGS. 1 to 2 , the surface of the first lens 10 facing the enlargement side is convex, and the surface facing the reduction side is convex; the surface of the second lens 20 facing the enlargement side is convex. , the surface toward the reduction side is concave; the surface of the third lens 30 toward the enlargement side is convex, and the surface toward the reduction side is concave; the surface of the fourth lens 40 toward the enlargement side is concave, and the surface toward the reduction side The surface of the fifth lens 50 toward the enlargement side is convex, and the surface toward the reduction side is convex; the surface of the sixth lens 60 toward the enlargement side is convex, and the surface toward the reduction side is convex.
本实施例中，第一透镜10为具有正光焦度的双凸型透镜，第二透镜20为具有负光焦度的弯月型透镜，第三透镜30为具有负光焦度的弯月型透镜，第四透镜40具有负焦距的双凹型透镜，第五透镜50具有负光焦度的为双凸型透镜，且第四透镜40与第五透镜50是组合在一起的双胶合透镜，第六透镜60为具有正光焦度的双凸型透镜。In this embodiment, the first lens 10 is a biconvex lens with positive power, the second lens 20 is a meniscus lens with negative power, and the third lens 30 is a meniscus lens with negative power. Lens, the fourth lens 40 has a biconcave lens with a negative focal length, the fifth lens 50 has a biconvex lens with a negative refractive power, and the fourth lens 40 and the fifth lens 50 are a doublet lens combined together. The six lenses 60 are biconvex lenses with positive refractive power.
在可选的实施方式中，所述投影镜头的焦距为f00，30mm<f00<36mm；和/或，所述前镜头组的焦距为f11，-357mm<f11<-347mm；所述后镜头组的焦距为f22，14mm<f22<20mm。In an optional embodiment, the focal length of the projection lens is f00, 30mm<f00<36mm; and/or, the focal length of the front lens group is f11, -357mm<f11<-347mm; the rear lens group The focal length is f22, 14mm<f22<20mm.
通过上述设置，可进一步降低投影镜头装配的公差敏感度，降低投影镜头的组装难度，并能够在存在微小震动的环境中保持成像清晰，稳定性较高，适合应用于车载HUD投影成像***中。Through the above settings, the tolerance sensitivity of the projection lens assembly can be further reduced, the difficulty of assembling the projection lens can be reduced, and the imaging can be kept clear and stable in an environment with slight vibrations, which is suitable for application in a vehicle-mounted HUD projection imaging system.
在可选的实施方式中，所述第一透镜10的焦距为f1，33mm<f1<39mm；所述第二透镜20的焦距为f2，-46mm<f2<-38mm；所述第三透镜30的焦距为f3，-14mm<f3<-8mm；所述第四透镜40的焦距为f4，-29mm<f4<-23mm；所述第五透镜50的焦距为f5，20mm<f5<24mm；所述第六透镜60的焦距为f6，25mm<f6<31mm；和/或，所述第四透镜40和所述第五透镜50形成的双胶合透镜的焦距为f4/5，43mm<f4/5<50mm。In an optional embodiment, the focal length of the first lens 10 is f1, 33mm<f1<39mm; the focal length of the second lens 20 is f2, -46mm<f2<-38mm; the third lens 30 The focal length of the lens is f3, -14mm<f3<-8mm; the focal length of the fourth lens 40 is f4, -29mm<f4<-23mm; the focal length of the fifth lens 50 is f5, 20mm<f5<24mm; The focal length of the sixth lens 60 is f6, 25mm<f6<31mm; and/or, the focal length of the doublet lens formed by the fourth lens 40 and the fifth lens 50 is f4/5, 43mm<f4/5 <50mm.
通过上述设置，可进一步降低投影镜头装配的公差敏感度，降低投影镜头的组装难度，并能够在存在微小震动的环境中保持成像清晰，稳定性较高，适合应用于车载HUD投影成像***中。而且，通过上述设置，本申请的投影镜头的MTF和相对照度这两项光学指标均可达标准，能够满足使用需求，而 无需附加渐晕，在未加渐晕的情况下，其通光效率会更高，使得投影镜头具有较高的相对照度，边缘损失光能量少，能够有效提高照明光能的利用率，从而提升投影镜头的成像画面的亮度和均匀度，当投影镜头应用于车载HUD投影成像***时，即使在白天处于户外环境光较亮的环境中，依然可以给驾驶者良好的观感。Through the above settings, the tolerance sensitivity of the projection lens assembly can be further reduced, the difficulty of assembling the projection lens can be reduced, and the imaging can be kept clear and stable in an environment with slight vibrations, which is suitable for application in a vehicle-mounted HUD projection imaging system. Moreover, through the above settings, the two optical indicators of the projection lens of the present application, MTF and relative illuminance, can reach the standard, which can meet the needs of use without additional vignetting. Without vignetting, its light transmission efficiency It will be higher, so that the projection lens has a higher relative illuminance, less light energy is lost at the edge, and can effectively improve the utilization rate of illumination light energy, thereby improving the brightness and uniformity of the imaging image of the projection lens. When the projection lens is applied to the vehicle HUD When projecting the imaging system, even in an environment with bright outdoor ambient light during the day, it can still give the driver a good look and feel.
在可选的实施方式中，请参阅图1至2，所述投影镜头还包括：光阑70，所述光阑70设于所述前镜头组和所述后镜头组之间。In an optional implementation manner, referring to FIGS. 1 to 2 , the projection lens further includes: an aperture 70 disposed between the front lens group and the rear lens group.
光阑70具体为孔径光阑70，光阑70用于限制通过的投影光线的直径，调节射出投影镜头的光通量，同时减少其他透镜经过反射产生的杂散光干扰，从而使投影光线的成像更加清晰。通常，光阑70的孔径为一个固定值，当然，为了灵活调整成像清晰度，使投影镜头能够更好的适应高低分辨率的切换，还可以将光阑70设置为可以调整孔径大小的方式。The diaphragm 70 is specifically an aperture diaphragm 70, and the diaphragm 70 is used to limit the diameter of the projected light passing through, adjust the luminous flux exiting the projection lens, and reduce the interference of stray light generated by reflection of other lenses, so that the imaging of the projected light is clearer . Usually, the aperture of the aperture 70 is a fixed value. Of course, in order to flexibly adjust the imaging definition, so that the projection lens can better adapt to the switching between high and low resolutions, the aperture 70 can also be set in a manner that can adjust the aperture size.
在可选的实施方式中，所述第一透镜10、所述第二透镜20、所述第三透镜30、所述第四透镜40、所述第五透镜50以及所述第六透镜60均为球面透镜。In an optional embodiment, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50 and the sixth lens 60 are all for spherical lenses.
本实施例中，投影镜头的六个透镜全部使用球面透镜，无非球面透镜加入，能够有效降低透镜的加工难度及生产成本。In this embodiment, the six lenses of the projection lens are all spherical lenses, and no aspherical lenses are added, which can effectively reduce the processing difficulty and production cost of the lenses.
在可选的实施方式中，所述第一透镜10、所述第二透镜20、所述第三透镜30、所述第四透镜40、所述第五透镜50以及所述第六透镜60均为光学玻璃材质。In an optional embodiment, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50 and the sixth lens 60 are all Made of optical glass.
在投影镜头应用于HUD投影光机并组装至车辆中时，相较于室内投影，车辆处于工作温度波动范围更大的工作环境中，这导致投影镜头需要承受大量的光照射，光能会部分转化成热能，若透镜采用一般的光学塑料材料，其受温度影响较大，易发生温漂问题。本实施例通过六个透镜全部使用玻璃材料，可适应较大的工作温度范围，温漂小，能够有效解决塑料透镜由于受热而导致的热跑焦问题。When the projection lens is applied to the HUD projection light machine and assembled into the vehicle, compared with indoor projection, the vehicle is in a working environment with a larger operating temperature fluctuation range, which causes the projection lens to withstand a large amount of light irradiation, and the light energy will be partially Converted into heat energy, if the lens is made of ordinary optical plastic materials, it is greatly affected by temperature and is prone to temperature drift. In this embodiment, all six lenses are made of glass material, which can adapt to a relatively large working temperature range, has small temperature drift, and can effectively solve the thermal out-of-focus problem of plastic lenses caused by heat.
为了进一步优化投影镜头的性能，请参阅表1，本申请中举例说明各个透 镜的面类型、曲率半径和厚度，以及各个透镜的玻璃材料(折射率和阿贝数)、半口径。其中，相邻两个透镜间隔位置的厚度表示为相邻两个透镜之间的距离。In order to further optimize the performance of the projection lens, please refer to Table 1. This application illustrates the surface type, radius of curvature and thickness of each lens, as well as the glass material (refractive index and Abbe number) and semi-aperture of each lens. Wherein, the thickness at the space between two adjacent lenses is represented as the distance between two adjacent lenses.
表1：Table 1:
Figure PCTCN2021133862-appb-000001
Figure PCTCN2021133862-appb-000001
在光学***中，由非近轴光线追迹所得的结果和近轴光线追迹所得的结 果不一致，与高斯光学(一级近似理论或近轴光线)的理想状况的偏差，称为像差。像差主要分为畸变、场曲、色差、球差、彗差、像散等。像差会影响投影镜头的成像质量，因此，在设计投影镜头时，需要尽可能地消除光学***成像时产生的像差。由第四透镜40和第五透镜50组成的双胶合透镜，能够有效消减光学成像过程中产生的色差；并且，通过六个透镜的组合而共同作用，能有效消减畸变、场曲等其他像差，从而保证成像质量。另外，通过设置第一透镜10在六个透镜中具有最大口径，第三透镜30、第二透镜20和第一透镜10的口径依次递增，可实现较大视场角范围，从而使驾驶者获得更好的观感。In the optical system, the result obtained by non-paraxial ray tracing is inconsistent with the result obtained by paraxial ray tracing, and the deviation from the ideal state of Gaussian optics (the first approximation theory or paraxial ray) is called aberration. Aberrations are mainly divided into distortion, field curvature, chromatic aberration, spherical aberration, coma, astigmatism, etc. Aberration will affect the imaging quality of the projection lens. Therefore, when designing the projection lens, it is necessary to eliminate the aberration generated by the imaging of the optical system as much as possible. The doublet lens composed of the fourth lens 40 and the fifth lens 50 can effectively reduce the chromatic aberration generated in the optical imaging process; and, through the combination of six lenses, they can effectively reduce distortion, field curvature and other aberrations , so as to ensure the image quality. In addition, by setting the first lens 10 to have the largest aperture among the six lenses, the apertures of the third lens 30, the second lens 20, and the first lens 10 are sequentially increased, so that a larger field of view range can be realized, so that the driver can obtain Better look and feel.
本实施例中，投影镜头的投射比为3，其中，投射比是指投影距离与投影画面宽度的比值。投影镜头的光圈数F＝2.7，能够满足投影镜头对亮度的要求，其中，光圈比是指焦距与光圈直径的比值，当光圈比越小时，投影镜头的相对口径越大，通光量越大；反之，当光圈比越大时，投影镜头的相对口径越小，通光量越小。投影镜头的视场角FOV＝12°，其中，视场角在光学工程中又称视场，视场角的大小决定了光学仪器的视野范围，视场角可用FOV表示。In this embodiment, the throw ratio of the projection lens is 3, where the throw ratio refers to the ratio of the projection distance to the width of the projection screen. The aperture number of the projection lens is F=2.7, which can meet the brightness requirements of the projection lens. Among them, the aperture ratio refers to the ratio of the focal length to the aperture diameter. When the aperture ratio is smaller, the relative aperture of the projection lens is larger and the light transmission is greater; Conversely, when the aperture ratio is larger, the relative diameter of the projection lens is smaller, and the light transmission is smaller. The field of view FOV of the projection lens is 12°. The field of view is also called the field of view in optical engineering. The size of the field of view determines the field of view of the optical instrument. The field of view can be represented by FOV.
为了更清楚地说明本申请投影镜头的光学效果，基于表1的参数数据，请参阅图3，图3为投影镜头的场曲与畸变图，其中，场曲是指像场弯曲，主要用于表示光学组件中，整个光束的交点与理想像点的不重合程度；畸变是指物体通过光学组件成像时，物体不同部分有不同的放大率的像差，畸变会导致物像的相似性变坏，但不影响像的清晰度。由图3可知，本实施例的投影镜头中，畸变小于1％，不会影响驾驶者观看体验。In order to more clearly illustrate the optical effect of the projection lens of this application, based on the parameter data in Table 1, please refer to Figure 3. Figure 3 is the field curvature and distortion diagram of the projection lens, where the field curvature refers to the curvature of the image field, which is mainly used for Indicates the degree of non-coincidence between the intersection point of the entire beam and the ideal image point in the optical component; distortion refers to the aberration of different magnifications in different parts of the object when the object is imaged through the optical component, and the distortion will lead to deterioration of the similarity of the object image , but does not affect the sharpness of the image. It can be seen from FIG. 3 that in the projection lens of this embodiment, the distortion is less than 1%, which will not affect the viewing experience of the driver.
基于表1的参数数据，请参阅图4，图4为投影镜头的各视场芯片面调制传递函数图，即MTF(ModulationTransferFunction)图MTF图用于是指调制度与图像内每毫米线对数之间的关系，用于评价对景物细部还原能力。以投影角度为视场取样间频率坐标，纵坐标为传递函数MTF值。由图4可知，本实施例的投影镜头中，每个视场的平均MTF＞0.6，成像良好。Based on the parameter data in Table 1, please refer to Figure 4. Figure 4 is the modulation transfer function diagram of each field of view chip surface of the projection lens, that is, the MTF (ModulationTransferFunction) diagram. The MTF diagram is used to refer to the relationship between the modulation degree and the number of lines per millimeter in the image. The relationship between them is used to evaluate the ability to restore the details of the scene. The projection angle is the frequency coordinate between samples of the field of view, and the ordinate is the MTF value of the transfer function. It can be seen from FIG. 4 that in the projection lens of this embodiment, the average MTF of each field of view is >0.6, and the imaging is good.
基于表1的参数数据，请参阅图5，图5为投影镜头的离焦MTF图，即随着离焦的距离，MTF数值的变化。由图5可知，本实施例的投影镜头中，MTF＞0.3离焦范围大于±0.02mm，显示具备较大的离焦范围，可适应不稳定的驾 驶环境。Based on the parameter data in Table 1, please refer to Figure 5, Figure 5 is the defocus MTF diagram of the projection lens, that is, the change of MTF value with the defocus distance. It can be seen from FIG. 5 that in the projection lens of this embodiment, the MTF>0.3 defocus range is greater than ±0.02mm, which shows that it has a larger defocus range and can adapt to unstable driving environments.
基于表1的参数数据，请参阅图6，图6为投影镜头的相对照度图，其中，相对照度是指像平面不同坐标点的照度和中心点照度之比。由图6可知，本实施例的投影镜头中，最边缘相对中心照度＞95％，说明该投影镜头的成像画面亮度均匀，边缘损失光能量少，能够提高光能的利用率，给驾驶者良好的观感。Based on the parameter data in Table 1, please refer to Figure 6. Figure 6 is the relative illuminance diagram of the projection lens, where the relative illuminance refers to the ratio of the illuminance at different coordinate points on the image plane to the illuminance at the center point. It can be seen from Fig. 6 that in the projection lens of this embodiment, the illuminance relative to the center of the most edge is >95%, indicating that the brightness of the imaging picture of the projection lens is uniform, the loss of light energy at the edge is small, and the utilization rate of light energy can be improved, which is good for the driver. look and feel.
本申请还提出一种投影装置100，请参阅图1至2，该投影装置100包括图像源80和投影镜头，该投影镜头的具体结构参照上述实施例，由于本投影装置100采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。其中，所述图像源80设于所述第六透镜60背离所述第五透镜50的一侧。The present application also proposes a projection device 100, please refer to FIGS. All the technical solutions of the above-mentioned embodiments, therefore at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be repeated here. Wherein, the image source 80 is disposed on a side of the sixth lens 60 away from the fifth lens 50 .
本实施例中，图像源80可选用数字微镜元件(Digital Micromirror Device，DMD)芯片。DMD是由很多矩阵排列的数字微反射镜组成，工作时每个微反射镜都能够朝正反两个方向进行偏转并锁定，从而使光线按既定的方向进行投射，并且以数万赫兹的频率进行摆动，将来自照明光源的光束通过微反射镜的翻转反射进入投影镜头成像在屏幕上。DMD具有分辨率高，信号无需数模转换等优点。当然，图像源80也可以选用硅上液晶(Liquid Crystal On Silicon，LCOS)芯片或其他可用于出射光线的显示元件。In this embodiment, the image source 80 can be a digital micromirror device (Digital Micromirror Device, DMD) chip. DMD is composed of many digital micro-mirrors arranged in a matrix. When working, each micro-mirror can be deflected and locked in two directions, so that the light is projected in a predetermined direction, and at a frequency of tens of thousands of hertz Swing, the light beam from the illumination source is reflected by the flip of the micro-mirror into the projection lens and imaged on the screen. DMD has the advantages of high resolution and no need for digital-to-analog conversion of signals. Of course, the image source 80 can also be a Liquid Crystal On Silicon (LCOS) chip or other display elements that can emit light.
本申请选用0.55英寸DMD作为发光芯片进行镜头成像设计。This application selects 0.55-inch DMD as the light-emitting chip for lens imaging design.
在可选的实施方式中，请参阅图1至2，所述投影装置100还包括：转折棱镜90，所述转折棱镜90设于所述第六透镜60和所述图像源80之间。In an optional implementation manner, referring to FIGS. 1 to 2 , the projection device 100 further includes: a turning prism 90 disposed between the sixth lens 60 and the image source 80 .
在一些实施例中，图像源80有时需要被动发光。因此，需要借助外部光源和转折棱镜90给图像源80提供额外的照明。具体地，棱镜可以为直角棱镜，直角棱镜的斜面朝向图像源80，直角棱镜的其中一个直角面朝向第六透镜60，同时，光源对应直角棱镜的斜面设置，且直角棱镜的斜面设置有半反半透膜。使用时，外部光源发出照明光线，射向直角棱镜的斜面，经半反半透膜反射后射向图像源80，从而为图像源80提供光线，光线经图像源80调制后经半反半透膜透射后向第六透镜60射出，并依次经过第六透镜60、第五透镜50、第 四透镜40、第三透镜30、第二透镜20以及第一透镜10，从而在投影屏幕上显示出投影图像。In some embodiments, image source 80 sometimes needs to be passively illuminated. Therefore, it is necessary to provide additional illumination to the image source 80 by means of an external light source and the turning prism 90 . Specifically, the prism can be a right-angle prism, the slope of the right-angle prism faces the image source 80, and one of the right-angle faces of the right-angle prism faces the sixth lens 60. Meanwhile, the light source corresponds to the slope of the right-angle prism, and the slope of the right-angle prism is provided with a semipermeable membrane. When in use, the external light source emits illuminating light, shoots to the slope of the right-angle prism, and shoots to the image source 80 after being reflected by the semi-reflective and semi-transparent film, thereby providing light for the image source 80. After the film is transmitted, it emits to the sixth lens 60, and passes through the sixth lens 60, the fifth lens 50, the fourth lens 40, the third lens 30, the second lens 20 and the first lens 10 in sequence, thereby displaying on the projection screen. projected image.
在可选的实施方式中，请参阅图1至2，所述投影装置100还包括：透明保护层81，所述透明保护层81设于所述图像源80朝向所述第六透镜60的一侧。In an optional implementation manner, please refer to FIGS. 1 to 2 , the projection device 100 further includes: a transparent protective layer 81 , and the transparent protective layer 81 is disposed on a side of the image source 80 facing the sixth lens 60 . side.
本实施例中，透明保护层81具体为一盖玻片，盖玻片的厚度为1.1㎜，盖玻片盖设于图像源80的出光面，能够在保证很好的透光率的前提下，有效保护图像源80，防止外界的灰尘进入图像源80，并且，还能够避免投影镜头中的其他透镜因振动对图像源80造成磕碰，保护图像源80免受外界环境或其他元件的冲击影响。In this embodiment, the transparent protective layer 81 is specifically a cover glass, the thickness of the cover glass is 1.1mm, and the cover glass is set on the light-emitting surface of the image source 80, which can ensure a good light transmittance. , effectively protect the image source 80, prevent external dust from entering the image source 80, and also prevent other lenses in the projection lens from bumping the image source 80 due to vibration, and protect the image source 80 from the impact of the external environment or other components .
以上所述仅为本申请的优选实施例，并非因此限制本申请的专利范围，凡是在本申请的申请构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。The above is only a preferred embodiment of the application, and does not limit the patent scope of the application. Under the application concept of the application, the equivalent structural transformation made by using the description of the application and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present application.

Claims (10)

  1. 一种投影镜头，其特征在于，所述投影镜头由放大侧至缩小侧沿同一光轴依次包括：A projection lens, characterized in that, the projection lens sequentially includes along the same optical axis from the enlargement side to the reduction side:
    第一透镜，所述第一透镜具有正光焦度；a first lens having positive optical power;
    第二透镜，所述第二透镜具有负光焦度；a second lens having negative optical power;
    第三透镜，所述第三透镜具有负光焦度；a third lens having negative optical power;
    第四透镜，所述第四透镜具有负光焦度；a fourth lens having negative optical power;
    第五透镜，所述第五透镜具有正光焦度，且所述第四透镜和所述第五透镜相对的表面相互胶合；以及a fifth lens, the fifth lens has positive refractive power, and the opposite surfaces of the fourth lens and the fifth lens are glued to each other; and
    第六透镜，所述第六透镜具有正光焦度；a sixth lens having positive optical power;
    其中，所述第一透镜、第二透镜和第三透镜组成前镜头组，所述前镜头组具有负光焦度；所述第四透镜、第五透镜和第六透镜组成后镜头组，所述后镜头组具有正光焦度。Wherein, the first lens, the second lens and the third lens form a front lens group, and the front lens group has negative refractive power; the fourth lens, the fifth lens and the sixth lens form a rear lens group, so The rear lens group has positive optical power.
  2. 如权利要求1所述的投影镜头，其特征在于，所述第一透镜朝向放大侧的表面为凸面，朝向像方一侧的表面为凸面；The projection lens according to claim 1, wherein the surface of the first lens facing the magnification side is a convex surface, and the surface of the first lens facing the image side is a convex surface;
    所述第二透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凹面；The surface of the second lens toward the enlargement side is convex, and the surface toward the reduction side is concave;
    所述第三透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凹面；The surface of the third lens toward the enlargement side is convex, and the surface toward the reduction side is concave;
    所述第四透镜朝向放大侧的表面为凹面，朝向缩小侧的表面为凹面；The surface of the fourth lens toward the enlargement side is concave, and the surface toward the reduction side is concave;
    所述第五透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面；The surface of the fifth lens toward the enlargement side is convex, and the surface toward the reduction side is convex;
    所述第六透镜朝向放大侧的表面为凸面，朝向缩小侧的表面为凸面。The surface of the sixth lens facing the enlargement side is convex, and the surface of the sixth lens facing the reduction side is convex.
  3. 如权利要求1所述的投影镜头，其特征在于，所述投影镜头的焦距为f00，30mm<f00<36mm；和/或，The projection lens according to claim 1, wherein the focal length of the projection lens is f00, 30mm<f00<36mm; and/or,
    所述前镜头组的焦距为f11，-357mm<f11<-347mm；The focal length of the front lens group is f11, -357mm<f11<-347mm;
    所述后镜头组的焦距为f22，14mm<f22<20mm。The focal length of the rear lens group is f22, 14mm<f22<20mm.
  4. 如权利要求1所述的投影镜头，其特征在于，所述第一透镜的焦距为f1，33mm<f1<39mm；The projection lens according to claim 1, wherein the focal length of the first lens is f1, 33mm<f1<39mm;
    所述第二透镜的焦距为f2，-46mm<f2<-38mm；The focal length of the second lens is f2, -46mm<f2<-38mm;
    所述第三透镜的焦距为f3，-14mm<f3<-8mm；The focal length of the third lens is f3, -14mm<f3<-8mm;
    所述第四透镜的焦距为f4，-29mm<f4<-23mm；The focal length of the fourth lens is f4, -29mm<f4<-23mm;
    所述第五透镜的焦距为f5，20mm<f5<24mm；The focal length of the fifth lens is f5, 20mm<f5<24mm;
    所述第六透镜的焦距为f6，25mm<f6<31mm；和/或，The focal length of the sixth lens is f6, 25mm<f6<31mm; and/or,
    所述第四透镜和所述第五透镜形成的双胶合透镜的焦距为f4/5，43mm<f4/5<50mm。The focal length of the doublet lens formed by the fourth lens and the fifth lens is f4/5, 43mm<f4/5<50mm.
  5. 如权利要求1所述的投影镜头，其特征在于，所述投影镜头还包括：The projection lens according to claim 1, wherein the projection lens further comprises:
    光阑，所述光阑设于所述前镜头组和所述后镜头组之间。A diaphragm, the diaphragm is arranged between the front lens group and the rear lens group.
  6. 如权利要求1所述的投影镜头，其特征在于，所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜、所述第五透镜以及所述第六透镜均为球面透镜。The projection lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all for spherical lenses.
  7. 如权利要求1所述的投影镜头，其特征在于，所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜、所述第五透镜以及所述第六透镜均为光学玻璃材质。The projection lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all Made of optical glass.
  8. 一种投影装置，其特征在于，所述投影装置包括图像源以及如权利要求1至7中任一项所述的投影镜头，所述图像源设于所述第六透镜背离所述第五透镜的一侧。A projection device, characterized in that the projection device comprises an image source and the projection lens according to any one of claims 1 to 7, the image source is arranged at the sixth lens away from the fifth lens side.
  9. 如权利要求8所述的投影装置，其特征在于，所述投影装置还包括：The projection device according to claim 8, wherein the projection device further comprises:
    转折棱镜，所述转折棱镜设于所述第六透镜和所述图像源之间。A turning prism, the turning prism is arranged between the sixth lens and the image source.
  10. 如权利要求8所述的投影装置，其特征在于，所述投影装置还包括：The projection device according to claim 8, wherein the projection device further comprises:
    透明保护层，所述透明保护层设于所述图像源朝向所述第六透镜的一侧。A transparent protective layer, the transparent protective layer is arranged on the side of the image source facing the sixth lens.
PCT/CN2021/133862 2021-10-29 2021-11-29 Projection lens and projection device WO2023070810A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202111279329.2A CN113933971B (en) 2021-10-29 2021-10-29 Projection lens and projection device
CN202111279329.2 2021-10-29

Publications (1)

Publication Number Publication Date
WO2023070810A1 true WO2023070810A1 (en) 2023-05-04

Family

ID=79285059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/133862 WO2023070810A1 (en) 2021-10-29 2021-11-29 Projection lens and projection device

Country Status (2)

Country Link
CN (1) CN113933971B (en)
WO (1) WO2023070810A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116299989A (en) * 2023-05-25 2023-06-23 歌尔光学科技有限公司 Projection lens, vehicle-mounted HUD and vehicle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115113369B (en) * 2022-06-29 2023-12-01 上海摩勤智能技术有限公司 Optical system and projector
CN116755228A (en) * 2023-05-19 2023-09-15 河南翊轩光电科技有限公司 Imaging lens and imaging equipment
CN117075308B (en) * 2023-10-17 2023-12-12 成都量芯集成科技有限公司 Imaging optical system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014021309A (en) * 2012-07-19 2014-02-03 Konica Minolta Inc Compact projection lens and projector
US20150362709A1 (en) * 2014-06-17 2015-12-17 Sintai Optical (Shenzhen) Co., Ltd. Projection Lens
CN105988194A (en) * 2015-01-30 2016-10-05 信泰光学(深圳)有限公司 Projection lens
CN110568586A (en) * 2019-08-30 2019-12-13 歌尔股份有限公司 Projection lens and projection equipment
CN211955960U (en) * 2020-05-21 2020-11-17 厦门力鼎光电股份有限公司 Optical imaging lens with fixed focus and low chromatic aberration
CN214504006U (en) * 2020-11-13 2021-10-26 歌尔光学科技有限公司 Projection lens, projection display system and projection display device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05157966A (en) * 1991-12-04 1993-06-25 Casio Comput Co Ltd Projection lens
JP2000035534A (en) * 1998-07-21 2000-02-02 Konica Corp Photographic lens
JP2001194584A (en) * 2000-01-13 2001-07-19 Sony Corp Projection lens and video projecting device
DE10328094B4 (en) * 2003-06-20 2006-04-06 Jos. Schneider Optische Werke Gmbh High open projection lens
TWI330718B (en) * 2007-04-20 2010-09-21 Asia Optical Co Inc Projection lens system
TW200846695A (en) * 2007-05-18 2008-12-01 Asia Optical Co Inc Zooming projection lens
CN101988983A (en) * 2009-07-31 2011-03-23 华柏光电股份有限公司 Optical lens applied to small projector
JP6072720B2 (en) * 2014-03-20 2017-02-01 富士フイルム株式会社 Projection lens and projection display device
TWI623773B (en) * 2016-06-02 2018-05-11 Calin Technology Co Ltd Fixed focus projection lens
JP2018092081A (en) * 2016-12-07 2018-06-14 富士フイルム株式会社 Image forming lens and optical device
CN112379520B (en) * 2020-11-06 2022-11-15 歌尔光学科技有限公司 Projection lens and be provided with on-vehicle HUD of this projection lens

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014021309A (en) * 2012-07-19 2014-02-03 Konica Minolta Inc Compact projection lens and projector
US20150362709A1 (en) * 2014-06-17 2015-12-17 Sintai Optical (Shenzhen) Co., Ltd. Projection Lens
CN105988194A (en) * 2015-01-30 2016-10-05 信泰光学(深圳)有限公司 Projection lens
CN110568586A (en) * 2019-08-30 2019-12-13 歌尔股份有限公司 Projection lens and projection equipment
CN211955960U (en) * 2020-05-21 2020-11-17 厦门力鼎光电股份有限公司 Optical imaging lens with fixed focus and low chromatic aberration
CN214504006U (en) * 2020-11-13 2021-10-26 歌尔光学科技有限公司 Projection lens, projection display system and projection display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116299989A (en) * 2023-05-25 2023-06-23 歌尔光学科技有限公司 Projection lens, vehicle-mounted HUD and vehicle
CN116299989B (en) * 2023-05-25 2023-09-12 歌尔光学科技有限公司 Projection lens, vehicle-mounted HUD and vehicle

Also Published As

Publication number Publication date
CN113933971A (en) 2022-01-14
CN113933971B (en) 2022-08-19

Similar Documents

Publication Publication Date Title
WO2023070810A1 (en) Projection lens and projection device
US9581795B2 (en) Projection-type video display device
CN114047613B (en) Optical system and projection device
WO2022267383A1 (en) Projection lens
JP2007079107A (en) Two-group zoom projection lens and projection type display device
WO2023184752A1 (en) Optical projection system and electronic device
JP2000039555A (en) Projection lens
US4753519A (en) Optical system for projection television apparatus
KR100473243B1 (en) Projection lens and projector provided with the same
JP4161294B2 (en) Projection lens
CN214751069U (en) Projection lens and projection equipment
WO2023231111A1 (en) Projection lens and projection device
JP2637317B2 (en) Projection lens
CN114690377B (en) Optical projection system and electronic equipment
JP4211373B2 (en) Projection lens and projector provided with the same
CN115113373A (en) Projection lens
CN115657312A (en) Projection lens and projection system
JPH10339844A (en) Projection lens device
CN114924380A (en) Optical projection system and electronic equipment
JP2813744B2 (en) Projection lens
CN116859557B (en) Projection lens and projection device
CN116299985B (en) Projection lens and projection module
JP2617908B2 (en) Projection optics
WO2023143008A1 (en) Projection lens, projection device, and vehicle
JP2004212729A (en) Projector

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21962154

Country of ref document: EP

Kind code of ref document: A1