Visual optical system

Abstract

The utility model discloses a visual optical system. The visual optical system comprises a first optical system and a second optical system, the first optical system sequentially comprises a first lens with positive focal power, a reflective polarizing element, a quarter-wave plate, a second lens with focal power and a third lens with positive focal power from a first side to a second side along a first optical axis; the second optical system sequentially comprises a first lens with focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with positive focal power and a sixth lens with focal power from the first side to the second side along the second optical axis; the second optical system comprises six lenses with focal power; the effective focal length f3'of the third lens, the distance TD 'from the first side surface of the first lens to the second side surface of the third lens on the first optical axis, the effective focal length f1 of the first lens and the distance TD from the first side surface of the first lens to the second side surface of the sixth lens on the second optical axis meet the following conditions: 1.9 lt; (f3 ' / TD') / (f1 / TD) lt; 5.7).

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to a visual optical system. Background Art

[0002] With the introduction of the concept of the metaverse, virtual reality and augmented reality technologies for human-computer interaction have ushered in a second opportunity for development. As an important entrance to human-computer interaction, the visual optical system plays a key role in it. Traditional visual optical systems usually include aspherical lenses or Fresnel lenses, which have problems such as long body length, heavy weight, and forward center of gravity, which will affect the user experience; in addition, the image resolution of traditional visual optical systems is poor. Utility Model Content

[0003] The present application provides a visual optical system that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0004] One aspect of the present application provides a visual optical system, which includes a first optical system and a second optical system; the first optical system includes a first lens with positive optical power, a reflective polarizing element, a quarter wave plate, a second lens with optical power and a third lens with positive optical power in sequence from the first side to the second side along the first optical axis; the second optical system includes a first lens with optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with positive optical power and a sixth lens with optical power in sequence from the first side to the second side along the second optical axis; wherein the number of lenses with optical power in the second optical system is six; the effective focal length f3' of the third lens, the distance TD' from the first side of the first lens to the second side of the third lens on the first optical axis, the effective focal length f1 of the first lens and the distance TD from the first side of the first lens to the second side of the sixth lens on the second optical axis satisfy: 1.9<(f3' / TD') / (|f1| / TD)<5.7.

[0005] According to an exemplary embodiment of the present application, the effective focal length f3' of the third lens, the curvature radius R6' of the second side surface of the third lens, the effective focal length f1 of the first lens and the curvature radius R1 of the first side surface of the first lens satisfy: -0.8<(f3' / R6') / (f1 / R1)<-0.2.

[0006] According to an exemplary embodiment of the present application, the refractive index N3' of the third lens, the refractive index N1 of the first lens and the total effective focal length f of the visual optical system satisfy: 1.1 mm<(N3' / N1)×f<1.8 mm.

[0007] According to an exemplary embodiment of the present application, the Abbe number V3' of the third lens, the Abbe number V1 of the first lens, and the Abbe number V2 of the second lens satisfy: 0.4 <V3' / (V1+V2)<1.5。

[0008] According to an exemplary embodiment of the present application, the effective focal length f1' of the first lens and the curvature radius R2' of the second side surface of the first lens satisfy: -2.4 <f1' / R2'<-0.6。

[0009] According to an exemplary embodiment of the present application, the curvature radius R3' of the first side surface of the second lens and the effective focal length f2' of the second lens satisfy: 0.4 <R3' / f2'<0.8。

[0010] According to an exemplary embodiment of the present application, the center thickness CT1' of the first lens on the first optical axis, the center thickness CTR of the reflective polarizing element on the first optical axis, the center thickness CTQ of the quarter-wave plate on the first optical axis and the total effective focal length f of the visual optical system satisfy: 2.1<(CT1'+CTR+CTQ) / f<3.8.

[0011] According to an exemplary embodiment of the present application, the center thickness CT2' of the second lens on the first optical axis, the center thickness CT3' of the third lens on the first optical axis and the total effective focal length f of the visual optical system satisfy: 4.9<(CT2'+CT3') / f<7.9.

[0012] According to an exemplary embodiment of the present application, the distance TD' from the first side surface of the first lens to the second side surface of the third lens on the first optical axis and the center thickness CT3' of the third lens on the first optical axis satisfy: 1.5 <TD' / CT3'<2.2。

[0013] According to an exemplary embodiment of the present application, the effective focal length f5 of the fifth lens and the total effective focal length f of the visual optical system satisfy the following conditions: 0.5 <f5 / f<1.4。

[0014] According to an exemplary embodiment of the present application, the effective focal length f4 of the fourth lens and the effective focal length f2 of the second lens satisfy: -1.7 <f4 / f2<-0.2。

[0015] According to an exemplary embodiment of the present application, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens satisfy: 0.2 <R1 / R2<0.8。

[0016] According to an exemplary embodiment of the present application, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R4 of the second side surface of the second lens satisfy: 0.1 <R5 / R4<1.8。

[0017] According to an exemplary embodiment of the present application, the center thickness CT4 of the fourth lens on the second optical axis, the Abbe number V4 of the fourth lens, the center thickness CT5 of the fifth lens on the second optical axis and the Abbe number V5 of the fifth lens satisfy: 0.1<(V4 / V5)×(CT4 / CT5)<1.7.

[0018] According to an exemplary embodiment of the present application, the distance TD from the first side surface of the first lens to the second side surface of the sixth lens on the second optical axis and the total effective focal length f of the visual optical system satisfy: 1.0 <TD / f<2.1。

[0019] According to an exemplary embodiment of the present application, the radius of curvature R12 of the second side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: -0.8 <R12 / f6<-0.1。

[0020] According to an exemplary embodiment of the present application, a display screen is provided on the second side of the visual optical system, and the second optical system is located between the first optical system and the display screen.

[0021] According to an exemplary embodiment of the present application, an angle θ between the second optical axis and the first optical axis satisfies: 0°<θ<90°.

[0022] The visual optical system provided in the present application is configured as a structural form of a combination of a first optical system and a second optical system. The focal length and distance of the lenses and / or lenses in each optical system will directly affect the focus and imaging quality of the image. By constraining (f3' / TD') / (|f1| / TD) within a certain range, on the one hand, the distortion and aberration can be minimized to the greatest extent, the clarity and contrast of the image can be improved, and thus the imaging quality of the visual optical system can be improved; on the other hand, the magnification and field of view of the visual optical system can be controlled, and the magnification and field of view of the visual optical system can be appropriately magnified, thereby ensuring that the user obtains a clear and comfortable visual experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0024] Figure 1 A schematic structural diagram of a visual optical system according to the present application is shown;

[0025] Figure 2 shows a schematic structural diagram of a second optical system according to the present application;

[0026] Figure 3 A schematic structural diagram of a visual optical system according to Embodiment 1 of the present application is shown;

[0027] Figure 4 A schematic structural diagram of a second optical system according to Embodiment 1 of the present application is shown;

[0028] Figure 5 shows a modulation transfer function curve of the visual optical system according to Example 1 of the present application;

[0029] Figure 6 A schematic structural diagram of a visual optical system according to Embodiment 2 of the present application is shown;

[0030] Figure 7 A schematic structural diagram of a second optical system according to Embodiment 2 of the present application is shown;

[0031] Figure 8 shows a modulation transfer function curve of a visual optical system according to Example 2 of the present application;

[0032] Fig. 9 A schematic structural diagram of a visual optical system according to Embodiment 3 of the present application is shown;

[0033] Fig.10 A schematic structural diagram of a second optical system according to Embodiment 3 of the present application is shown;

[0034] Fig.11 shows a modulation transfer function curve of a visual optical system according to Example 3 of the present application;

[0035] Fig.12 A schematic structural diagram of a visual optical system according to Embodiment 4 of the present application is shown;

[0036] Fig.13 shows a schematic structural diagram of a second optical system according to Embodiment 4 of the present application; and

[0037] Fig.14 The modulation transfer function curve of the visual optical system according to Example 4 of the present application is shown. DETAILED DESCRIPTION

[0038] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0039] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0040] In the drawings, the thickness, size and shape of the lenses and / or mirrors have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0041] In this article, the paraxial region refers to the region near the optical axis. If the surface of a lens and / or a lens is convex and the position of the convex surface is not defined, it means that the surface of the lens and / or the lens is convex at least in the paraxial region; if the surface of a lens and / or the lens is concave and the position of the concave surface is not defined, it means that the surface of the lens and / or the lens is concave at least in the paraxial region. The surface of each lens and / or the lens closest to the first side (e.g., the side close to the human eye) is called the first side of the lens and / or the lens, and the surface of each lens and / or the lens closest to the second side (e.g., the side far from the human eye) is called the second side of the lens and / or the lens.

[0042] It should also be understood that the terms "include", "comprising", "having", "including" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The features, principles and other aspects of the present application are described in detail below.

[0046] refer to Figure 1 and Figure 2In a first aspect of the present application, a visual optical system is provided, which may include a first optical system and a second optical system. The first optical system may be configured as a catadioptric optical system. The second optical system is used to capture an eye image of a user, and to obtain the gaze point information of the human eye based on the captured eye image, so as to realize the eye tracking function. The number of first optical systems may be one or more. The number of second optical systems may be one or more. In one example, the visual optical system may include two first optical systems and two second optical systems that are symmetrically arranged.

[0047] In an exemplary embodiment, the first optical system may include a first lens, a reflective polarizing element, a quarter wave plate, a second lens, and a third lens arranged in sequence from the first side to the second side along the first optical axis (e.g., the Z1 axis). The first optical system in the present application includes three lenses, a reflective polarizing element, and a quarter wave plate. The polarization state of the light changes after passing through the quarter wave plate. The light with the changed polarization state is reflected or transmitted at the reflective polarizing element, so that the light is refracted between the first lens and the second lens or between the first lens and the third lens, effectively shortening the main body length of the first optical system.

[0048] In an exemplary embodiment, the first lens may have positive optical power. The second lens may have positive optical power or negative optical power. The third lens may have positive optical power.

[0049] In an exemplary embodiment, the reflective polarizing element is bonded to the quarter wave plate and attached to the second side surface of the first lens. Compared with the quarter wave plate, the reflective polarizing element is closer to the second side surface of the first lens. By combining the reflective polarizing element and the quarter wave plate to form a film layer, the number of attached surfaces of the film layer can be reduced, and the attachment yield of the film layer can be improved.

[0050] In an exemplary embodiment, the first optical system may further include a partial reflective layer, which may be attached to the first side surface or the second side surface of the second lens, or the partial reflective layer may be attached to the first side surface or the second side surface of the third lens. The partial reflective layer has a semi-transmissive and semi-reflective effect on light. By providing a partial reflective layer and combining a reflective polarizing element and a quarter-wave plate, the light can be refracted multiple times, effectively reducing the main body length of the first optical system.

[0051] In an exemplary embodiment, the second optical system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the first side to the second side along the second optical axis (e.g., the Z2 axis). An air gap may be provided between adjacent two lenses of the first to sixth lenses.

[0052] In an exemplary embodiment, the first lens may have positive or negative power, the first side thereof may be convex or concave, and the second side thereof may be convex or concave.

[0053] In an exemplary embodiment, the second lens may have positive or negative power, its first side may be convex or concave, and its second side may be convex or concave.

[0054] In an exemplary embodiment, the third lens may have positive power or negative power, the first side surface thereof may be convex or concave, and the second side surface thereof may be convex or concave.

[0055] In an exemplary embodiment, the fourth lens may have positive power or negative power, and the first side surface thereof may be a concave surface, and the second side surface thereof may be a convex surface.

[0056] In an exemplary embodiment, the fifth lens may have positive power, the first side surface thereof may be convex, and the second side surface thereof may be convex or concave.

[0057] In an exemplary embodiment, the sixth lens may have positive power or negative power, the first side surface thereof may be convex or concave, and the second side surface thereof may be convex or concave.

[0058] In an exemplary embodiment, the first side may be the side close to the human eye, and the second side may be the side far from the human eye. Accordingly, the first side of each element (the first lens, the second lens, the third lens, the reflective polarizing element, the quarter wave plate, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens) may be referred to as the side close to the human eye, and the second side may be referred to as the side far from the human eye.

[0059] In an exemplary embodiment, the second optical system is located on a side of the first optical system away from the human eye. For example, a display screen may be provided on the second side of the visual optical system, and the second optical system is located between the first optical system and the display screen. Light from the human eye passes through the first optical system and then reaches the second optical system, which receives the light and presents an image. By placing the second optical system on a side of the first optical system away from the human eye, the visual optical system can have an eye tracking function without affecting the performance and function of the first optical system, improving the appearance of a subsequent device including the visual optical system, and making the second optical system invisible to the naked eye, thereby improving the aesthetics of the device.

[0060] In an exemplary embodiment, the angle θ between the second optical axis and the first optical axis may satisfy: 0°<θ<90°. By controlling the angle between the second optical axis and the first optical axis, the second optical system can be placed outside the first optical system, so that the second optical system can capture the eye image while ensuring the performance and function of the first optical system, thereby realizing the eye tracking function.

[0061] In an exemplary embodiment, the second optical system may further include a stop, and the stop may be disposed between the first optical system and the first lens.

[0062] In an exemplary embodiment, the spacing distance Tx from the intersection of the second side surface of the third lens and the first optical axis in the first optical system to the intersection of the aperture center and the second optical axis along the first optical axis direction may satisfy: 0mm≤Tx<15.0mm. By controlling the x-direction distance between the second optical system and the first optical system, the second optical system can be effectively constrained to be located between the first optical system and the display screen, thereby ensuring the feasibility of the eye tracking solution.

[0063] In an exemplary embodiment, the spacing distance Ty from the intersection of the second side surface of the third lens and the first optical axis to the intersection of the aperture center and the second optical axis in the direction perpendicular to the first optical axis can satisfy: 5mm≤Ty<25.0mm. By controlling the y-direction distance between the second optical system and the first optical system, the caliber of the bracket used to support the second optical system can be effectively constrained, and the caliber of the bracket is between the caliber of the first optical system and the size of the display screen, which is conducive to the assembly of the second optical system.

[0064] In an exemplary embodiment, the effective focal length f3' of the third lens, the distance TD' from the first side surface of the first lens to the second side surface of the third lens on the first optical axis, the effective focal length f1 of the first lens and the distance TD from the first side surface of the first lens to the second side surface of the sixth lens on the second optical axis can satisfy: 1.9<(f3' / TD') / (|f1| / TD)<5.7. The visual optical system provided in the present application is configured as a structural form of a combination of a first optical system and a second optical system. The focal length and distance of the lenses and / or lenses in each optical system will directly affect the focus and imaging quality of the image. By constraining (f3' / TD') / (|f1| / TD) within a certain range, on the one hand, the distortion and aberration can be minimized, the clarity and contrast of the image can be improved, and the imaging quality of the visual optical system can be improved; on the other hand, the magnification and field of view of the visual optical system can be controlled, and the magnification and field of view of the visual optical system can be appropriately enlarged, thereby ensuring that the user obtains a clear and comfortable visual experience. If the value of (f3' / TD') / (|f1| / TD) is too small, for example, (f3' / TD') / (|f1| / TD)≤1.9, the imaging quality of the visual optical system will deteriorate and affect the user's visual experience.

[0065] In an exemplary embodiment, the effective focal length f3' of the third lens, the radius of curvature R6' of the second side surface of the third lens, the effective focal length f1 of the first lens, and the radius of curvature R1 of the first side surface of the first lens may satisfy: -0.8 < (f3' / R6') / (f1 / R1) < -0.2. By controlling the above conditional expression, the ratio between the focal length of the third lens in the first optical system and the focal length of the first lens in the second optical system can be made appropriate, ensuring the propagation and focusing effect of light in the visual optical system, thereby improving the imaging quality and clarity of the visual optical system. If the above ratio is too small, the light will be over-diverged, resulting in a blurred image; if the ratio is too large, the light will be over-concentrated, resulting in the image being overly focused, with aberrations and distortions occurring. By limiting the above ratio within a reasonable range, the light can be kept moderately focused and clear and accurate imaging can be provided.

[0066] In an exemplary embodiment, the refractive index N3' of the third lens, the refractive index N1 of the first lens, and the total effective focal length f of the visual optical system may satisfy: 1.1 mm < (N3' / N1)×f < 1.8 mm. By controlling the above conditional expression, the total effective focal length of the visual optical system can be constrained within a reasonable range, enabling the visual optical system to obtain good imaging quality at a certain refractive index. Reasonably selecting the refractive index and focal length can make the light focus or scatter better, reduce aberrations and distortions, and improve the clarity and accuracy of the imaging of the visual optical system; at the same time, it can also ensure that the focal point position of the visual optical system remains relatively stable within an acceptable range, providing a better viewing experience for users and avoiding problems such as blurred or unclear images. In addition, the visual optical system has a smaller focal length range, simplifying the optical design and manufacturing process, reducing material and processing costs, and improving production efficiency.

[0067] In an exemplary embodiment, the Abbe number V3' of the third lens, the Abbe number V1 of the first lens, and the Abbe number V2 of the second lens may satisfy: 0.4 < V3' / (V1+V2) < 1.5. By controlling the above conditional expression, the focusing effect and dispersion characteristics of light can be controlled, enhancing the performance and function of the visual optical system; at the same time, it can also constrain the chromatic aberration of the visual optical system, reduce the dispersion effect of the visual optical system, and improve the imaging quality of the visual optical system.

[0068] In an exemplary embodiment, the effective focal length f1' of the first lens and the radius of curvature R2' of the second surface of the first lens may satisfy: -2.4 < f1' / R2' < -0.6. By constraining the ratio of the effective focal length of the first lens to the radius of curvature of the second surface of the first lens within a reasonable range, it is possible to ensure that light is focused in an optimal manner during the refraction and reflection by the reflective polarizing element on the second surface of the first lens, improve the clarity and quality of the image formed by the visual optical system, and optimize the performance of the visual optical system.

[0069] In an exemplary embodiment, the radius of curvature R3' of the first surface of the second lens and the effective focal length f2' of the second lens may satisfy: 0.4 < R3' / f2' < 0.8. By constraining the ratio of the radius of curvature of the first surface of the second lens to the effective focal length of the second lens within a reasonable range, it is possible to focus light on the focal plane of the visual optical system, reduce aberration, and improve the imaging quality of the image formed by the visual optical system; at the same time, it can also optimize the light flux of the visual optical system, and improve the sensitivity and light transmittance of the visual optical system.

[0070] In an exemplary embodiment, the central thickness CT1' of the first lens on the first optical axis, the central thickness CTR of the reflective polarizing element on the first optical axis, the central thickness CTQ of the quarter-wave plate on the first optical axis, and the total effective focal length f of the visual optical system may satisfy: 2.1 < (CT1' + CTR + CTQ) / f < 3.8. By controlling the above conditional expression, it is possible to optimize the imaging performance of the visual optical system, and make optical elements such as the first lens, the reflective polarizing element, and the quarter-wave plate more compact in design, which helps to reduce the size and weight of the visual optical system, making it more lightweight and easy to carry; at the same time, it can also reduce the risk of interference and collision between optical elements, which helps to improve the reliability and durability of the visual optical system, and reduce the possibility of damage and failure of the visual optical system.

[0071] In an exemplary embodiment, the central thickness CT2' of the second lens on the first optical axis, the central thickness CT3' of the third lens on the first optical axis, and the total effective focal length f of the visual optical system may satisfy: 4.9 < (CT2' + CT3') / f < 7.9. The aperture and volume of the first optical system are much larger than those of the second optical system. By controlling the above conditional expression, it is possible to make the second lens and the third lens more compact in design, which helps to reduce the size and weight of the first optical system; at the same time, it can also reduce aberration and distortion, improve the clarity and accuracy of the image formed by the visual optical system, and optimize the imaging performance of the visual optical system.

[0072] In an exemplary embodiment, the distance TD' on the first optical axis from the first side surface of the first lens to the second side surface of the third lens and the central thickness CT3' of the third lens on the first optical axis may satisfy: 1.5 < TD' / CT3' < 2.2. By controlling the above conditional expression, the size and weight of the visual optical system can be reduced, making it more lightweight and easy to carry, thereby achieving the compactness and lightweight of the visual optical system; at the same time, aberration can also be reduced, improving the imaging quality and clarity of the visual optical system. In addition, the above conditional expression is also helpful for the optimization and design of the visual optical system. On the premise of meeting the requirements of the visual optical system, it helps to determine the optimal structure and enables the performance of the visual optical system to reach the best state.

[0073] In an exemplary embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the visual optical system may satisfy: 0.5 < f5 / f < 1.4. By constraining the ratio of the effective focal length of the fifth lens to the total effective focal length of the visual optical system within a reasonable range, the field of view width of the visual optical system can be increased, facilitating the user to observe and perceive the surrounding environment more comprehensively; at the same time, the depth of field of the visual optical system can also be improved, enabling the visual optical system to clearly present scenes at both near and far distances simultaneously, improving the observation effect.

[0074] In an exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length f2 of the second lens may satisfy: -1.7 < f4 / f2 < -0.2. By constraining the ratio of the effective focal lengths of the fourth lens and the second lens within a reasonable range, the visual optical system can have an appropriate field of view angle and magnification, avoiding problems such as loss of details caused by excessive magnification and poor observation effects caused by insufficient magnification; at the same time, it is also beneficial for the visual optical system to obtain a wider field of view, providing a more realistic visual experience for the user.

[0075] In an exemplary embodiment, the radius of curvature R1 of the first side surface of the first lens and the radius of curvature R2 of the second side surface of the first lens may satisfy: 0.2 < R1 / R2 < 0.8. By constraining the ratio of the radii of curvature of the first and second side surfaces of the first lens within a reasonable range, the shape of the first lens can be prevented from being too flat or too steep, reducing aberration and optical distortion, improving the clarity and accuracy of the imaging of the visual optical system, and reducing the processing difficulty of the first lens while meeting the requirements of light convergence.

[0076] In an exemplary embodiment, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R4 of the second side surface of the second lens may satisfy: 0.1 < R5 / R4 < 1.8. By constraining the ratio of the radius of curvature of the first side surface of the third lens to the radius of curvature of the second side surface of the second lens within a reasonable range, the focusing effect of light can be maintained, aberrations and distortions can be reduced, thereby improving the imaging quality of the visual optical system; at the same time, it can also enable the visual optical system to have an appropriate magnification, ensuring that users obtain a clear and comfortable visual experience.

[0077] In an exemplary embodiment, the center thickness CT4 of the fourth lens on the second optical axis, the Abbe number V4 of the fourth lens, the center thickness CT5 of the fifth lens on the second optical axis, and the Abbe number V5 of the fifth lens satisfy: 0.1 < (V4 / V5)×(CT4 / CT5) < 1.7. By controlling the above conditional expression, the ratio of the Abbe numbers of the fourth lens and the fifth lens can be constrained within a reasonable range, effectively constraining the chromatic aberration of the visual optical system, reducing the dispersion effect, and improving the imaging quality of the visual optical system; at the same time, it can also constrain the ratio of the center thicknesses of the fourth lens and the fifth lens within a reasonable range, ensuring that the center thickness of the lens matches other optical parameters, and reducing the volume and weight of the visual optical system.

[0078] In an exemplary embodiment, the distance TD on the second optical axis from the first side surface of the first lens to the second side surface of the sixth lens and the total effective focal length f of the visual optical system may satisfy: 1.0 < TD / f < 2.1. By controlling the above conditional expression, the overall size of the second optical system can be made relatively small, facilitating the integration and installation of the second optical system; at the same time, it can also reduce the optical distortion and aberration inside the visual optical system, improving the performance stability of the visual optical system.

[0079] In an exemplary embodiment, the radius of curvature R12 of the second side surface of the sixth lens and the effective focal length f6 of the sixth lens may satisfy: -0.8 < R12 / f6 < -0.1. By constraining the ratio of the radius of curvature of the second side surface of the sixth lens to the effective focal length of the sixth lens within a reasonable range, the shape and position of the sixth lens can be reasonably selected, minimizing the aberrations of the visual optical system, especially spherical aberration and coma, thereby improving the imaging quality of the visual optical system; at the same time, it is also beneficial to design a more stable visual optical system to ensure that the visual optical system has good imaging performance within different working distance ranges and will not cause an increase in aberrations due to changes in the focal length.

[0080] The visual optical system according to the above-mentioned embodiment of the present application may include a first optical system and a second optical system, wherein the first optical system may use multiple lenses, such as the three lenses described above, and the second optical system may use multiple lenses, such as the six lenses described above. By reasonably configuring the parameters of the first optical system and the second optical system, the imaging quality of the visual optical system can be improved, and the visual optical system can have an appropriate magnification and field of view to ensure that the user has a clear and comfortable visual experience. The visual optical system configured as above has the characteristics of miniaturization and good imaging quality, which can well meet the use requirements of various portable electronic products in projection scenes, and the center of gravity of the visual optical system and the device including the visual optical system is moved backward to improve the user experience.

[0081] In an embodiment of the present application, at least one of the surfaces of each lens in the first lens to the third lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Similarly, at least one of the surfaces of each lens in the first lens to the sixth lens is an aspherical surface.

[0082] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of constituent lenses and / or mirrors may be changed to obtain the various results and advantages described in this specification.

[0083] refer to Figure 1 and Figure 2 According to a second aspect of the present application, a visual optical system may include a first optical system and a second optical system; the first optical system includes, in sequence from the first side to the second side along the first optical axis, a first lens with positive optical power, a reflective polarizing element, a quarter-wave plate, a second lens with optical power, and a third lens with positive optical power; the second optical system includes, in sequence from the first side to the second side along the second optical axis, a first lens with optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with positive optical power, and a sixth lens with optical power; the number of lenses with optical power in the second optical system is six.

[0084] Among them, the effective focal length f3' of the third lens, the radius of curvature R6' of the second side of the third lens, the effective focal length f1 of the first lens and the radius of curvature R1 of the first side of the first lens can satisfy: -0.8<(f3' / R6') / (f1 / R1)<-0.2. The visual optical system provided in the present application is configured as a structural form of a combination of a first optical system and a second optical system. By constraining (f3' / R6') / (f1 / R1) within a certain range, the ratio between the focal length of the third lens in the first optical system and the focal length of the first lens in the second optical system can be appropriate, ensuring the propagation and focusing effect of light in the visual optical system, thereby improving the imaging quality and clarity of the visual optical system. If the above ratio is too small, the light will be overly defocused, resulting in blurred images; if the ratio is too large, the light will be overly concentrated, resulting in over-focusing of the image, and problems such as aberrations and distortions will occur. By limiting the above ratio within a reasonable range, the light can be kept moderately focused and clear and accurate imaging can be provided.

[0085] Specific embodiments of the visual optical system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0086] Example 1

[0087] The following reference Figures 3 to 5 The visual optical system according to Example 1 of the present application is described. Figure 3 A schematic structural diagram of the visual optical system of Example 1 is shown. Figure 4 A schematic structural diagram of the second optical system of Example 1 is shown. Figure 5 The Modulation Transfer Function (MTF) curve of the visual optical system of Example 1 is shown.

[0088] like Figure 3 and Figure 4 As shown, the visual optical system may include a first optical system 100 and a second optical system 200, and the second optical system 200 is located on a side of the first optical system 100 away from the human eye. The first optical system 100 includes a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3 in sequence from the side close to the human eye to the side far from the human eye along the first optical axis. The first optical system 100 may also be provided with a partial reflection layer, and the partial reflection layer is provided on a side surface of the second lens L2 or the third lens L3. The second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence from the side close to the human eye to the side far from the human eye along the second optical axis. The aperture STO may be provided between the first optical system 100 and the first lens E1.

[0089] Among them, the first lens L1 has positive focal power, and its side surface S1' near the human eye is convex, and its side surface S2' far from the human eye is convex. The reflective polarizing element RP has a side surface near the human eye and a side surface far from the human eye, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2' far from the human eye of the first lens L1. The quarter-wave plate QWP has a side surface near the human eye and a side surface far from the human eye, and its side surface near the human eye is attached to the side surface far from the human eye of the reflective polarizing element RP. The second lens L2 has negative focal power, and its side surface S3' near the human eye is concave, and its side surface S4' far from the human eye is convex. The third lens L3 has positive focal power, and its side surface S5' near the human eye is convex, and its side surface S6' far from the human eye is convex.

[0090] Among them, the first lens E1 has positive focal power, and its side S1 near the human eye is convex, and the side S2 far from the human eye is concave. The second lens E2 has positive focal power, and its side S3 near the human eye is concave, and the side S4 far from the human eye is convex. The third lens E3 has negative focal power, and its side S5 near the human eye is concave, and the side S6 far from the human eye is concave. The fourth lens E4 has negative focal power, and its side S7 near the human eye is concave, and the side S8 far from the human eye is convex. The fifth lens E5 has positive focal power, and its side S9 near the human eye is convex, and the side S10 far from the human eye is convex. The sixth lens E6 has positive focal power, and its side S11 near the human eye is convex, and the side S12 far from the human eye is convex. The filter E7 has a side S13 near the human eye and a side S14 far from the human eye. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0091] Table 1 shows the basic parameter table of the visual optical system of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0092]

[0093]

[0094] Table 1

[0095] In this embodiment, the side surfaces proximal to the human eye and the side surfaces distal to the human eye of the first lens L1 to the third lens L3, and the side surfaces proximal to the human eye and the side surfaces distal to the human eye of the first lens E1 to the sixth lens E6 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0096]

[0097] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A 10 , A 12 , A 14 and A 16 .

[0098]

[0099]

[0100] Table 2

[0101] Example 2

[0102] The following reference Figures 6 to 8 The visual optical system according to Example 2 of the present application is described. Figure 6 A schematic structural diagram of the visual optical system of Example 2 is shown. Figure 7 A schematic structural diagram of the second optical system of Example 2 is shown. Figure 8 A modulation transfer function (MTF) curve of the visual optical system of Example 2 is shown.

[0103] like Figure 6 and Figure 7 As shown, the visual optical system may include a first optical system 100 and a second optical system 200, and the second optical system 200 is located on a side of the first optical system 100 away from the human eye. The first optical system 100 includes a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3 in sequence from the side close to the human eye to the side far from the human eye along the first optical axis. The first optical system 100 may also be provided with a partial reflection layer, and the partial reflection layer is provided on a side surface of the second lens L2 or the third lens L3. The second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence from the side close to the human eye to the side far from the human eye along the second optical axis. The aperture STO may be provided between the first optical system 100 and the first lens E1.

[0104] Among them, the first lens L1 has positive focal power, and its side surface S1' near the human eye is concave, and the side surface S2' far from the human eye is convex. The reflective polarizing element RP has a side surface near the human eye and a side surface far from the human eye, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2' far from the human eye of the first lens L1. The quarter-wave plate QWP has a side surface near the human eye and a side surface far from the human eye, and its side surface near the human eye is attached to the side surface far from the human eye of the reflective polarizing element RP. The second lens L2 has negative focal power, and its side surface S3' near the human eye is concave, and the side surface S4' far from the human eye is a plane. The third lens L3 has positive focal power, and its side surface S5' near the human eye is a plane, and the side surface S6' far from the human eye is a convex surface.

[0105] Among them, the first lens E1 has negative focal power, and its side S1 near the human eye is concave, and the side S2 far from the human eye is convex. The second lens E2 has positive focal power, and its side S3 near the human eye is convex, and the side S4 far from the human eye is concave. The third lens E3 has positive focal power, and its side S5 near the human eye is convex, and the side S6 far from the human eye is convex. The fourth lens E4 has negative focal power, and its side S7 near the human eye is concave, and the side S8 far from the human eye is convex. The fifth lens E5 has positive focal power, and its side S9 near the human eye is convex, and the side S10 far from the human eye is convex. The sixth lens E6 has positive focal power, and its side S11 near the human eye is concave, and the side S12 far from the human eye is convex. The optical element E7 has a side S13 near the human eye and a side S14 far from the human eye. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0106] Table 3 shows the basic parameter table of the visual optical system of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0107]

[0108]

[0109] Table 3

[0110] In this embodiment, the near-eye side and far-eye side of the first lens L1, the near-eye side of the second lens L2, the far-eye side of the third lens L3, and the near-eye side and far-eye side of the first lens E1 to the sixth lens E6 are all aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A64, A65, A66, A70, A71, A72, A73, A74, A75 10 , A 12 , A 14 and A 16 .

[0111]

[0112]

[0113] Table 4

[0114] Example 3

[0115] The following reference Figures 9 to 11 The visual optical system according to Example 3 of the present application is described. Fig. 9 A schematic structural diagram of the visual optical system of Example 3 is shown. Fig.10 A schematic structural diagram of the second optical system of Example 3 is shown. Fig.11 A modulation transfer function (MTF) curve of the visual optical system of Example 3 is shown.

[0116] like Fig. 9 and Fig.10 As shown, the visual optical system may include a first optical system 100 and a second optical system 200, and the second optical system 200 is located on a side of the first optical system 100 away from the human eye. The first optical system 100 includes a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3 in sequence from the side close to the human eye to the side far from the human eye along the first optical axis. The first optical system 100 may also be provided with a partial reflection layer, and the partial reflection layer is provided on a side surface of the second lens L2 or the third lens L3. The second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence from the side close to the human eye to the side far from the human eye along the second optical axis. The aperture STO may be provided between the first optical system 100 and the first lens E1.

[0117] Among them, the first lens L1 has positive focal power, and its side surface S1' near the human eye is convex, and its side surface S2' far from the human eye is convex. The reflective polarizing element RP has a side surface near the human eye and a side surface far from the human eye, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2' far from the human eye of the first lens L1. The quarter-wave plate QWP has a side surface near the human eye and a side surface far from the human eye, and its side surface near the human eye is attached to the side surface far from the human eye of the reflective polarizing element RP. The second lens L2 has negative focal power, and its side surface S3' near the human eye is concave, and its side surface S4' far from the human eye is concave. The third lens L3 has positive focal power, and its side surface S5' near the human eye is convex, and its side surface S6' far from the human eye is convex.

[0118] The first lens E1 has positive focal power, and its side surface S1 near the human eye is convex, and its side surface S2 far from the human eye is concave. The second lens E2 has negative focal power, and its side surface S3 near the human eye is convex, and its side surface S4 far from the human eye is concave. The third lens E3 has negative focal power, and its side surface S5 near the human eye is convex, and its side surface S6 far from the human eye is concave. The fourth lens E4 has positive focal power, and its side surface S7 near the human eye is concave, and its side surface S8 far from the human eye is convex. The fifth lens E5 has positive focal power, and its side surface S9 near the human eye is convex, and its side surface S10 far from the human eye is concave. The sixth lens E6 has negative focal power, and its side surface S11 near the human eye is concave, and its side surface S12 far from the human eye is concave. The optical element E7 has a side surface S13 near the human eye and a side surface S14 far from the human eye. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0119] Table 5 shows a basic parameter table of the visual optical system of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0120]

[0121]

[0122] Table 5

[0123] In this embodiment, the side surfaces near the human eye and the side surfaces far from the human eye of the first lens L1 to the third lens L3, and the side surfaces near the human eye and the side surfaces far from the human eye of the first lens E1 to the sixth lens E6 are all aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, 10 , A 12 , A 14 and A 16 .

[0124] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1' -4.8524E-01 -8.1530E-02 -4.8933E-02 1.0052E-02 -1.1256E-02 1.9505E-03 -8.1676E-04 S2' 1.3422E-01 2.4111E-02 2.1013E-04 -6.2016E-03 -2.7975E-03 4.9328E-04 3.3116E-04 S3' -3.4535E-01 1.3235E-02 1.3069E-01 -3.5501E-02 3.8362E-03 1.7737E-04 -2.8648E-04 S4' -9.7724E-01 1.2301E-01 -2.1000E-01 6.4941E-02 -1.6673E-02 2.5460E-03 1.6000E-03 S5' -9.7724E-01 1.2301E-01 -2.1000E-01 6.4941E-02 -1.6673E-02 2.5460E-03 1.6000E-03 S6' 6.3214E-03 -1.1485E-02 -1.2245E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S1 2.3267E-03 -1.3075E-03 -5.8430E-04 -2.0780E-04 -7.0335E-05 -1.8075E-05 -2.5294E-06 S2 -5.9133E-03 -2.5102E-03 -6.4561E-04 -1.5776E-04 -3.9191E-05 -9.4142E-06 -8.9190E-07 S3 -1.1167E-01 -1.2156E-02 -3.2770E-03 -9.0737E-05 -2.7889E-05 9.7654E-05 1.2367E-05 S4 -1.5090E-01 1.0650E-02 1.0501E-03 2.4625E-03 -5.5371E-05 1.8208E-04 -6.3018E-05 S5 -1.9862E-01 6.6025E-02 -1.2049E-02 1.9687E-03 -1.1817E-03 6.1477E-04 -2.4130E-04 S6 -5.3323E-01 5.0734E-02 2.7606E-02 5.3679E-03 -3.4526E-03 -1.8291E-03 -7.4068E-04 S7 -1.0832E-01 -6.3608E-02 3.0338E-02 -4.7737E-03 1.8475E-03 1.8688E-04 -9.8671E-05 S8 4.1893E-01 -1.9647E-02 -9.7728E-03 -4.7023E-03 2.1359E-03 7.4384E-04 -1.0506E-03 S9 -1.8787E+00 5.1801E-01 -1.6086E-01 3.5187E-02 -4.8380E-03 6.5353E-04 -1.2525E-03 S10 -1.0380E+00 2.2344E-01 -1.2424E-01 7.4030E-02 -3.0460E-02 1.6937E-02 -5.7711E-03 S11 1.7828E-01 6.7874E-02 -8.5315E-02 5.5890E-02 -2.2756E-02 1.1626E-02 -7.0958E-03 S12 -2.3582E+00 5.6046E-01 -1.4813E-01 3.2418E-02 -1.1432E-02 1.0075E-02 -4.0129E-03

[0125] Table 6

[0126] Example 4

[0127] The following reference Figure 12 to Figure 14 The visual optical system according to Example 4 of the present application is described. Fig.12 A schematic structural diagram of the visual optical system of Example 4 is shown. Fig.13 A schematic structural diagram of the second optical system of Example 4 is shown. Fig.14 A modulation transfer function (MTF) curve of the visual optical system of Example 4 is shown.

[0128] like Fig.12 and Fig.13As shown, the visual optical system may include a first optical system 100 and a second optical system 200, and the second optical system 200 is located on a side of the first optical system 100 away from the human eye. The first optical system 100 includes a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3 in sequence from the side close to the human eye to the side far from the human eye along the first optical axis. The first optical system 100 may also be provided with a partial reflection layer, and the partial reflection layer is provided on a side surface of the second lens L2 or the third lens L3. The second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence from the side close to the human eye to the side far from the human eye along the second optical axis. The aperture STO may be provided between the first optical system 100 and the first lens E1.

[0129] Among them, the first lens L1 has positive focal power, and its side surface S1' near the human eye is concave, and the side surface S2' far from the human eye is convex. The reflective polarizing element RP has a side surface near the human eye and a side surface far from the human eye, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2' far from the human eye of the first lens L1. The quarter-wave plate QWP has a side surface near the human eye and a side surface far from the human eye, and its side surface near the human eye is attached to the side surface far from the human eye of the reflective polarizing element RP. The second lens L2 has positive focal power, and its side surface S3' near the human eye is convex, and the side surface S4' far from the human eye is a plane. The third lens L3 has positive focal power, and its side surface S5' near the human eye is a plane, and the side surface S6' far from the human eye is a convex surface.

[0130] The first lens E1 has negative focal power, and its side S1 near the human eye is concave, and its side S2 far from the human eye is convex. The second lens E2 has positive focal power, and its side S3 near the human eye is convex, and its side S4 far from the human eye is concave. The third lens E3 has positive focal power, and its side S5 near the human eye is convex, and its side S6 far from the human eye is convex. The fourth lens E4 has negative focal power, and its side S7 near the human eye is concave, and its side S8 far from the human eye is convex. The fifth lens E5 has positive focal power, and its side S9 near the human eye is convex, and its side S10 far from the human eye is concave. The sixth lens E6 has negative focal power, and its side S11 near the human eye is convex, and its side S12 far from the human eye is concave. The optical element E7 has a side S13 near the human eye and a side S14 far from the human eye. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0131] Table 7 shows a basic parameter table of the visual optical system of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0132]

[0133]

[0134] Table 7

[0135] In this embodiment, the near-eye side surface and the far-eye side surface of the first lens L1, the near-eye side surface of the second lens L2, the far-eye side surface of the third lens L3, and the near-eye side surfaces and the far-eye side surfaces of the first lens E1 to the sixth lens E6 are all aspherical surfaces. Table 8 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A4 10 , A 12 , A 14 and A 16 .

[0136] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1' -9.4583E-01 -1.9555E-01 -1.0082E-01 -4.1586E-02 -1.3268E-02 -2.4985E-03 -1.9133E-03 S2' 1.4170E-01 5.7186E-02 -4.7677E-03 -6.3182E-03 -6.1732E-04 9.3834E-04 -1.7605E-04 S3' -6.2249E-01 -3.1748E-02 5.9938E-02 2.7461E-03 -5.0228E-03 4.1308E-03 4.9000E-03 S6' 6.3214E-03 -1.1485E-02 -1.2245E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S1 2.6922E-01 -6.5309E-03 6.5483E-03 7.0913E-07 7.5697E-05 1.6836E-04 5.4661E-05 S2 1.6352E-01 -8.2064E-03 1.0205E-03 -1.5568E-04 -9.4174E-05 4.6998E-05 9.0757E-06 S3 -2.3583E-02 1.9239E-04 -6.1602E-04 2.1445E-05 -5.8011E-06 2.5308E-05 -4.4420E-06 S4 -7.0578E-02 7.4692E-03 -1.1089E-03 2.3816E-05 -2.2994E-05 7.2955E-06 2.0594E-05 S5 -7.7468E-02 -5.3639E-04 9.5329E-05 -1.2750E-04 1.1351E-05 2.2282E-05 6.6044E-07 S6 -5.3270E-02 -7.3123E-03 3.7737E-04 -2.4031E-04 -4.7558E-05 1.9073E-05 -8.8679E-07 S7 1.5556E-01 -1.6048E-02 9.1178E-03 -2.4387E-03 -1.7633E-04 1.1447E-04 -9.9645E-05 S8 -1.2256E-02 3.3919E-02 1.4764E-02 -6.9962E-04 5.6132E-04 3.5281E-04 -9.1916E-05 S9 -4.9514E-01 1.2081E-02 7.4383E-03 -4.0352E-03 2.7761E-03 -5.4058E-04 -2.1281E-04 S10 3.5411E-01 -3.5180E-02 6.2496E-03 -7.5297E-03 4.6737E-03 -5.4497E-04 -5.8916E-04 S11 -1.7596E+00 4.1270E-01 -1.0728E-01 3.5434E-02 -1.9493E-02 1.4959E-02 -5.8271E-03 S12 -3.5739E+00 6.4909E-01 -2.0739E-01 9.6065E-02 -2.7695E-02 1.3137E-02 -9.2120E-03

[0137] Table 8

[0138] Table 9 shows the values ​​of f, f1', f2', f3', f1, f2, f3, f4, f5, f6, Tx, and Ty in each of Examples 1 to 4, wherein the units of the parameters shown in Table 9 are all millimeters, and Tx and Ty can be calculated according to Figure 1 The marking method is used to measure.

[0139]

[0140]

[0141] Table 9

[0142] In summary, Table 10 shows the values ​​of the conditional expressions of each of Examples 1 to 4.

[0143] Conditional / Example 1 2 3 4 (f3' / TD') / (|f1| / TD) 4.63 5.62 3.30 1.98 f5 / f 0.57 1.02 1.38 0.68 f1' / R2' -0.69 -2.21 -0.76 -2.38 R3' / f2' 0.43 0.62 0.70 0.54 (CT1'+CTR+CTQ) / f 3.36 3.42 3.75 2.12 (CT2'+CT3') / f 4.98 7.85 4.92 5.53 f4 / f2 -1.68 -1.04 -0.27 -0.69 R1 / R2 0.37 0.23 0.47 0.71 R5 / R4 0.69 0.38 1.70 0.18 (f3' / R6') / (f1 / R1) -0.76 -0.76 -0.57 -0.26 (N3' / N1)×f 1.62 1.17 1.78 1.57 V3' / (V1+V2) 1.45 0.50 1.02 0.74 (V4 / V5)×(CT4 / CT5) 0.98 0.12 0.88 1.63 TD / f 1.46 2.07 1.09 1.26 TD' / CT3' 2.10 1.62 2.10 1.57 R12 / f6 -0.70 -0.35 -0.76 -0.14

[0144] Table 10

[0145] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. A visual optical system, comprising a first optical system and a second optical system, It is characterized in that The first optical system includes, in order from the first side to the second side along the first optical axis, a first lens with positive optical power, a reflective polarizing element, a quarter wave plate, a second lens with optical power, and a third lens with positive optical power; The second optical system includes, in sequence from the first side to the second side along the second optical axis: a first lens having an optical power; a second lens having optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having positive power; and a sixth lens having optical power; wherein the number of lenses having optical power in the second optical system is six; The effective focal length f3' of the third lens, the distance TD' from the first side surface of the first lens to the second side surface of the third lens on the first optical axis, the effective focal length f1 of the first lens and the distance TD from the first side surface of the first lens to the second side surface of the sixth lens on the second optical axis satisfy: 1.9<(f3' / TD') / (|f1| / TD)<5.

7.

2. The visual optical system according to claim 1, It is characterized in that The effective focal length f3' of the third lens, the curvature radius R6' of the second side surface of the third lens, the effective focal length f1 of the first lens and the curvature radius R1 of the first side surface of the first lens satisfy: -0.8<(f3' / R6') / (f1 / R1)<-0.

2.

3. The visual optical system according to claim 1, It is characterized in that The refractive index N3' of the third lens, the refractive index N1 of the first lens and the total effective focal length f of the visual optical system satisfy: 1.1 mm<(N3' / N1)×f<1.8 mm.

4. The visual optical system according to claim 1, It is characterized in that The Abbe number V3' of the third lens, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: 0.4 <V3' / (V1+V2)<1.5。 5. The visual optical system according to any one of claims 1 to 4, It is characterized in that The effective focal length f1' of the first lens and the curvature radius R2' of the second side surface of the first lens satisfy: -2.4 <f1' / R2'<-0.6。 6. The visual optical system according to any one of claims 1 to 4, It is characterized in that The curvature radius R3' of the first side surface of the second lens and the effective focal length f2' of the second lens satisfy: 0.4 <R3' / f2'<0.8。 7. The visual optical system according to any one of claims 1 to 4, It is characterized in that The center thickness CT1' of the first lens on the first optical axis, the center thickness CTR of the reflective polarizing element on the first optical axis, the center thickness CTQ of the quarter-wave plate on the first optical axis and the total effective focal length f of the visual optical system satisfy: 2.1<(CT1'+CTR+CTQ) / f<3.

8.

8. The visual optical system according to any one of claims 1 to 4, It is characterized in that A center thickness CT2' of the second lens on the first optical axis, a center thickness CT3' of the third lens on the first optical axis, and a total effective focal length f of the visual optical system satisfy: 4.9<(CT2'+CT3') / f<7.

9.

9. The visual optical system according to any one of claims 1 to 4, It is characterized in that The distance TD' from the first side surface of the first lens to the second side surface of the third lens on the first optical axis and the center thickness CT3' of the third lens on the first optical axis satisfy: 1.5 <TD' / CT3'<2.2。 10. The visual optical system according to any one of claims 1 to 4, It is characterized in that The effective focal length f5 of the fifth lens and the total effective focal length f of the visual optical system satisfy: 0.5 <f5 / f<1.4。 11. The visual optical system according to any one of claims 1 to 4, It is characterized in that The effective focal length f4 of the fourth lens and the effective focal length f2 of the second lens satisfy: -1.7 <f4 / f2<-0.2。 12. The visual optical system according to any one of claims 1 to 4, It is characterized in that The curvature radius R1 of the first side surface of the first lens and the curvature radius R2 of the second side surface of the first lens satisfy: 0.2 <R1 / R2<0.8。 13. The visual optical system according to any one of claims 1 to 4, It is characterized in that The curvature radius R5 of the first side surface of the third lens and the curvature radius R4 of the second side surface of the second lens satisfy: 0.1 <R5 / R4<1.8。 14. The visual optical system according to any one of claims 1 to 4, It is characterized in that The center thickness CT4 of the fourth lens on the second optical axis, the Abbe number V4 of the fourth lens, the center thickness CT5 of the fifth lens on the second optical axis and the Abbe number V5 of the fifth lens satisfy: 0.1<(V4 / V5)×(CT4 / CT5)<1.

7.

15. The visual optical system according to any one of claims 1 to 4, It is characterized in that The distance TD from the first side surface of the first lens to the second side surface of the sixth lens on the second optical axis and the total effective focal length f of the visual optical system satisfy: 1.0 <TD / f<2.1。 16. The visual optical system according to any one of claims 1 to 4, It is characterized in that The curvature radius R12 of the second side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: -0.8 <R12 / f6<-0.1。 17. The visual optical system according to any one of claims 1 to 4, It is characterized in that A display screen is disposed on the second side of the visual optical system, and the second optical system is located between the first optical system and the display screen.

18. The visual optical system according to any one of claims 1 to 4, It is characterized in that An included angle θ between the second optical axis and the first optical axis satisfies: 0°<θ<90°.

Images