Optical lens and near-eye display device

Abstract

The present invention provides an optical lens and a near-eye display device, which sequentially include a first group with positive optical power, a second group with positive optical power and a third group with negative optical power along the reverse direction of light transmission; the first group sequentially includes a first lens with positive optical power and a second lens with positive optical power from the entrance pupil side of the human eye to the image source side; the second group sequentially includes a third lens with negative optical power, a fourth lens with negative optical power, a fifth lens with optical power, a sixth lens with optical power and a seventh lens with positive optical power from the entrance pupil side of the human eye to the image source side; the third group sequentially includes an eighth lens with negative optical power and a ninth lens with negative optical power from the entrance pupil side of the human eye to the image source side; the distance CT between the light entrance surface of the ninth lens and the image source on the optical axis is W The optical lens provided by the present invention has the advantages of adjustable diopter and excellent imaging quality.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens and a near-eye display device. Background Art

[0002] With the development of virtual reality (VR) technology, the forms and types of virtual reality devices are becoming increasingly diverse, and the application fields are also constantly expanding. It has been widely used in many fields such as games, social networking, education, and medical care. Current near-eye display devices such as VR usually transmit and magnify the display screen in the device through an optical lens, and then transmit the output image to the human eye. Therefore, the human eye receives the magnified virtual image of the display screen, thereby achieving the purpose of large-screen viewing through near-eye display devices such as VR.

[0003] In order to provide users with an excellent sensory experience, VR and other near-eye display devices need to have a larger field of view, a larger eye movement range, and higher-quality imaging. At the same time, in order to meet the needs of users with different degrees of myopia or hyperopia, they also need to have adjustable diopter. However, the optical lenses currently used in VR devices still have shortcomings such as large distortion, poor diopter adjustment, and poor imaging quality, which cannot meet market demand well. Summary of the invention

[0004] In view of the above problems, the object of the present invention is to provide an optical lens having the advantages of adjustable diopter and excellent imaging quality.

[0005] The technical solution adopted by the present invention is:

[0006] An optical lens, which includes, in sequence from the entrance pupil side of a human eye to the image source side along the reverse direction of light transmission: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power;

[0007] The first group includes, from the entrance pupil side of the human eye to the image source side, a first lens having positive optical power and a second lens having positive optical power;

[0008] The second group includes, from the entrance pupil side of the human eye to the image source side, a third lens having negative optical power, a fourth lens having negative optical power, a fifth lens, a sixth lens, and a seventh lens having positive optical power;

[0009] The third group includes, from the entrance pupil side of the human eye to the image source side, an eighth lens having negative optical power and a ninth lens having negative optical power;

[0010] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens each include a light incident surface close to the image source side and a light exit surface close to the entrance pupil side of the human eye;

[0011] Wherein, the distance CT between the light incident surface of the ninth lens and the image source on the optical axis is W The range is adjustable and meets: 1mm <CT W <8mm;

[0012] The combined focal length f of the first group Q1 The effective focal length f of the optical lens satisfies: 0.5 <f Q1 / f<2.5;

[0013] The combined focal length f of the second group Q2 The effective focal length f of the optical lens satisfies: 0.4 <f Q2 / f<0.9;

[0014] The combined focal length f of the third group Q3 The effective focal length f of the optical lens satisfies: -0.8 <f Q3 / f<-0.4.

[0015] The present invention also provides a near-eye display device, which includes, in sequence along the direction of light signal transmission: an image source and the above-mentioned optical lens; the image source is used to emit a light signal, and the light signal includes image information; the optical lens is arranged in the light emitting direction of the image source, and the ninth lens is arranged closer to the image source than the first lens, and the optical lens is used to modulate the light signal emitted by the image source and transmit it to the human eye.

[0016] Compared with the prior art, the optical lens provided by the present invention has a larger field of view angle through a specific surface shape setting and reasonable optical focal length distribution. The larger field of view angle can provide a wide field of view display effect, giving users a better experience; at the same time, the optical lens also has a larger image surface and higher resolution, which can match a large-size image source to achieve high-definition imaging and improve imaging quality. The diopter adjustment from -7D to +2D can be achieved by adjusting the spatial spacing distance between the entire lens group and the image source on the optical axis, and all have high imaging quality, bringing users an excellent sensory experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic diagram of the structure of a near-eye display device provided in an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the optical lens provided in Example 1 of the present invention.

[0020] Figure 3 This is a F-Tan(θ) distortion curve of the optical lens provided in Example 1 of the present invention.

[0021] Figure 4 This is a field curvature curve diagram of the optical lens provided in Example 1 of the present invention.

[0022] Figure 5 The vertical axis chromatic aberration curve of the optical lens provided in Example 1 of the present invention is shown in FIG.

[0023] Figure 6 Schematic diagram of the structure of the optical lens provided in Example 2 of the present invention.

[0024] Figure 7 This is a F-Tan(θ) distortion curve of the optical lens provided in Example 2 of the present invention.

[0025] Figure 8 This is a field curvature curve diagram of the optical lens provided in Example 2 of the present invention.

[0026] Fig. 9 This is a vertical axis chromatic aberration curve diagram of the optical lens provided in Example 2 of the present invention.

[0027] Fig.10 Schematic diagram of the structure of the optical lens provided in Example 3 of the present invention.

[0028] Fig.11 This is a F-Tan(θ) distortion curve diagram of the optical lens provided in Example 3 of the present invention.

[0029] Fig.12 This is a field curvature curve diagram of the optical lens provided in Example 3 of the present invention.

[0030] Fig.13 The vertical axis chromatic aberration curve of the optical lens provided in Example 3 of the present invention is shown.

[0031] Fig.14 This is a schematic diagram of the structure of the optical lens provided in Example 4 of the present invention.

[0032] Fig.15 This is a F-Tan(θ) distortion curve of the optical lens provided in Example 4 of the present invention.

[0033] Fig.16 This is a field curvature curve diagram of the optical lens provided in Example 4 of the present invention.

[0034] Fig.17 This is a vertical axis chromatic aberration curve diagram of the optical lens provided in Example 4 of the present invention.

[0035] Fig.18This is a schematic diagram of the structure of the optical lens provided in Example 5 of the present invention.

[0036] Fig.19 This is a F-Tan(θ) distortion curve of the optical lens provided in Example 5 of the present invention.

[0037] Fig. 20 This is a field curvature curve diagram of the optical lens provided in Example 5 of the present invention.

[0038] Fig.21 This is a vertical axis chromatic aberration curve diagram of the optical lens provided in Example 5 of the present invention.

[0039] Fig. 22 This is a schematic diagram of the structure of the optical lens provided in Example 6 of the present invention.

[0040] Fig.23 This is a F-Tan(θ) distortion curve of the optical lens provided in Example 6 of the present invention.

[0041] Fig.24 This is a field curvature curve diagram of the optical lens provided in Example 6 of the present invention.

[0042] Fig.25 This is a vertical axis chromatic aberration curve diagram of the optical lens provided in Example 6 of the present invention.

[0043] Fig.26 This is a schematic diagram of the optical path of the near-eye display device provided in Example 7 of the present invention.

[0044] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0045] 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 the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] 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 invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. 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 only examples and are not drawn strictly to scale.

[0048] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.

[0049] It should also be understood that the terms "comprises", "including", "having", "includes" 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 expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "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.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as 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.

[0051] 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.

[0052] The present invention provides an optical lens, which is used to modulate the light signal emitted by the image source and transmit it to the entrance pupil side of the human eye. The optical lens is arranged in the light emitting direction of the image source, that is, the emission surface of the image source is the light emitting side of the light signal. The optical lens includes: a first group with positive optical power, a second group with positive optical power and a third group with negative optical power in sequence from the entrance pupil side of the human eye to the image source side along the reverse direction of light transmission; the first group includes a first lens and a second lens in sequence from the entrance pupil side of the human eye to the image source side; the second group includes a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the entrance pupil side of the human eye to the image source side; the third group includes an eighth lens and a ninth lens in sequence from the entrance pupil side of the human eye to the image source side; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens each include a light entrance surface close to the image source side and a light exit surface close to the entrance pupil side of the human eye. It can be understood that the surface of each lens close to the image source is called the light incident surface of the lens, and the surface of each lens close to the entrance pupil side of the human eye is called the light exit surface of the lens.

[0053] In some embodiments, the first lens may have positive focal power, the light exiting surface of the first lens is concave, and the light incident surface of the first lens is convex. The second lens may have positive focal power, the light exiting surface of the second lens is convex, and the light incident surface of the second lens may be concave or convex. The third lens may have negative focal power, the light exiting surface of the third lens may be concave or convex, and the light incident surface of the third lens may be concave or convex. The fourth lens may have negative focal power, the light exiting surface of the fourth lens is concave, and the light incident surface of the fourth lens is concave. The fifth lens may have positive focal power or negative focal power, the light exiting surface of the fifth lens is convex, and the light incident surface of the fifth lens is concave. The sixth lens may have positive focal power or negative focal power, the light exiting surface of the sixth lens is convex, and the light incident surface of the sixth lens may be concave or convex. The seventh lens may have positive focal power, the light exiting surface of the seventh lens is convex, and the light incident surface of the seventh lens is convex at the near optical axis. The eighth lens may have negative focal power, the light exit surface of the eighth lens is convex at the near optical axis, and the light entrance surface of the eighth lens is concave at the near optical axis. The ninth lens may have negative focal power, the light exit surface of the ninth lens is concave, and the light entrance surface of the ninth lens may be concave or convex. It should be noted that, based on the need for aberration optimization, the surface shape of some lenses from the first lens to the ninth lens can be appropriately adjusted, so the adjustment of the surface shape of some lenses belongs to the inventive concept of this application.

[0054] In order to meet the wearing needs of users with different refractive degrees, the air spacing CT between the entire lens group (consisting of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens) and the image source on the optical axis can be dynamically adjusted. W(i.e., the distance between the incident light surface of the ninth lens and the image source on the optical axis) to achieve the adjustment of the optical lens between different diopters, so as to well meet the wearing needs of users with different refractive degrees. More specifically, the distance CT between the incident light surface of the ninth lens and the image source side on the optical axis W The adjustment range of satisfies: 1mm < CT W < 8mm. Meeting the above conditions can make the lens have a large optical back focal length. On the one hand, it can give the light emitted from the image source side a large refraction space, improve the matching adaptability of the optical lens with a large-size display screen, and at the same time reserve a large space between the image source and the optical lens, facilitating the adjustment of the distance between the two, so that the diopter adjustment in a large range (such as -7D to +2D) can be realized, and the wearing needs of users with different myopia or hyperopia degrees can be met.

[0055] In some embodiments, the combined focal length f of the first group Q1 and the effective focal length f of the optical lens satisfy: 0.5 < f Q1 / f < 2.5; the combined focal length f of the second group Q2 and the effective focal length f of the optical lens satisfy: 0.4 < f Q2 / f < 0.9; the combined focal length f of the third group Q3 and the effective focal length f of the optical lens satisfy: -0.8 < f Q3 / f < -0.4. Meeting the above conditions, by reasonably matching the focal length ratios of the three groups, the light emitted from the image source side can be appropriately diverged and enter the human eye at a nearly parallel viewing angle, ensuring a large field of view while improving the overall imaging quality, ensuring its use on near-eye display devices, effectively improving the user's immersion, and enabling users with different myopia or hyperopia degrees to have a better sensory experience.

[0056] In some embodiments, the on-axis distance TL from the light-emitting surface of the first lens to the incident light surface of the ninth lens and the effective focal length f of the optical lens satisfy: 1.45 < TL / f < 1.6. Meeting the above conditions is beneficial for the optical lens to have a relatively compact structure, and at the same time enables the lens to have a long focal length, which can better present larger local details and improve the picture quality.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 9 < f1 / f < 30. Meeting the above conditions can effectively converge the light, so that the outgoing light enters the human eye observation area at a relatively parallel viewing angle, ensuring a large eye movement range of the optical lens while providing a better immersion experience for users.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.5 < f2 / f < 3. Meeting the above conditions is beneficial to converging the light rays emitted from the image source side, reducing the divergence degree of the light rays, so as to enter the human eye at a nearly parallel viewing angle, ensuring a large field of view and improving the overall imaging quality at the same time.

[0059] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f < -2. Meeting the above conditions can appropriately slow down the turning degree of the light rays and diverge the light rays better into the human eye, so as to provide a wide field of view display effect and improve the user's immersion feeling.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -2 < f4 / f < -0.5. Meeting the above conditions, by setting the fourth lens to have an appropriate negative refractive power, the convergence degree of the marginal light rays can be slowed down, which is beneficial to correcting the distortion of the optical lens and improving the imaging quality of the lens marginal field of view.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 0.2 < f7 / f < 0.9. Meeting the above conditions is beneficial to the convergence of the light rays, enabling the diverged light rays to smoothly enter the rear optical system, reducing the correction difficulty of various aberrations, and better realizing the high-quality imaging of the lens.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -1.8 < f8 / f < -0.5. Meeting the above conditions can further diverge the light rays to increase the area of the projected virtual image and provide a better immersion experience for the user.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f9 of the ninth lens satisfy: -2 < f9 / f < -0.5. Meeting the above conditions can diverge the light rays emitted from the image source side to a greater extent to increase the area of the projected virtual image and provide a better immersion experience for the user.

[0064] In some embodiments, the exit pupil distance ED of the optical lens and the effective focal length f of the optical lens satisfy: 0.45 < ED / f < 0.6. The exit pupil distance ED represents the distance on the optical axis from the entrance pupil side of the human eye to the light-emitting surface of the first lens. Meeting the above conditions can ensure a large exit pupil distance while achieving a large field of view, reduce the dizziness feeling when the human eye wears, and improve the sensory experience.

[0065] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 5 < f1 / f2 < 30. Meeting the above conditions, by reasonably allocating the focal lengths of the first lens and the second lens, the degree of light refraction can be effectively reduced, enabling the optical lens to have a large field of view angle and long focal length performance, thereby achieving an effect close to the human eye's field of view.

[0066] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 1 < f3 / f4 < 100. Meeting the above conditions is beneficial for correcting the aberration of the optical lens and improving the imaging quality of the optical lens.

[0067] In some embodiments, the focal length f8 of the eighth lens and the focal length f9 of the ninth lens satisfy: 0.3 < f8 / f9 < 1.5. Meeting the above conditions is beneficial for correcting the aberration of the optical lens under different diopter conditions, improving the imaging quality, and enabling users with different degrees of myopia or hyperopia to have a better sensory experience when wearing it.

[0068] In some embodiments, the exit pupil distance ED of the optical lens and the on-axis distance TL from the light-emitting surface of the first lens to the light-incident surface of the ninth lens satisfy: 0.3 < ED / TL < 0.36. Meeting the above conditions ensures that the optical lens has an appropriate exit pupil distance, meets the human eye's observation range, and effectively reduces the overall optical length of the lens.

[0069] In some embodiments, the central thickness CT5 of the fifth lens and the central thickness CT6 of the sixth lens satisfy: 0.15 < CT5 / CT6 < 0.45. Meeting the above conditions can effectively relieve the degree of light convergence, and at the same time make the thicknesses of the fifth and sixth lenses appropriate, ensuring their good processability.

[0070] In some embodiments, the optical lens satisfies the conditional formula: 37.5mm < TTL < 45mm, 22mm < f < 25mm; 65° < FOV < 75°, 30mm < IH < 36.5mm; where TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the display area length of the image source that the optical lens can match. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has the advantages of a large field of view angle and the ability to match a large-size image source.

[0071] In some embodiments, the lens material in the optical lens provided by the present invention may be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. In addition, when the lens material is glass, the geometric chromatic aberration of the optical lens can be effectively corrected by the low dispersion characteristic of the glass itself. The fourth lens can be a glass or plastic lens; the first lens, the second lens, the third lens, the sixth lens, the seventh lens, and the ninth lens are all glass lenses; the fifth lens and the eighth lens are all plastic lenses. The optical lens adopts a glass-plastic hybrid structure to effectively improve the thermal stability of the lens.

[0072] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens may be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and reducing the size of lenses, and better miniaturizing the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens of the present invention may all be aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and reducing the size of lenses, and better miniaturizing the lens.

[0073] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0074] ;

[0075] Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients respectively.

[0076] In addition, the present invention also provides a near-eye display device, which includes, in sequence along the direction of light signal transmission: an image source, the above-mentioned optical lens; the image source is used to emit a light signal, and the light signal includes image information; the optical lens is arranged in the light emitting direction of the image source, and the ninth lens is arranged closer to the image source than the first lens, and the optical lens is used to modulate the light signal emitted by the image source and transmit it to the human eye.

[0077] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0078] Example 1

[0079] See also Figure 1 , which is a schematic diagram of the structure of a near-eye display device 700 provided in an embodiment of the present invention, please refer to Figure 2 , which is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention, is used to modulate the optical signal emitted by the image source 10 and transmit it to the entrance pupil side of the human eye. The optical lens 100 is arranged in the light emitting direction of the image source 10, that is, the emitting surface of the image source 10 is the light emitting side of the optical signal. Figure 2 It can be seen that the optical lens 100 is sequentially provided with: an aperture ST, a first group with positive optical power, a second group with positive optical power and a third group with negative optical power along the reverse direction of light transmission (i.e., from the entrance pupil side of the human eye to the image source side).

[0080] The first group includes the first lens L1 and the second lens L2 in order from the entrance pupil side of the human eye to the image source side; the second group includes the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in order from the entrance pupil side of the human eye to the image source side; the third group includes the eighth lens L8 and the ninth lens L9 in order from the entrance pupil side of the human eye to the image source side. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 each include a light entrance surface close to the image source side and a light exit surface close to the entrance pupil side of the human eye. It can be understood that the surface of each lens close to the image source 10 is called the light entrance surface of the lens, and the surface of each lens close to the entrance pupil side of the human eye is called the light exit surface of the lens. It should be noted that the entrance pupil position of the human eye is the aperture ST of the optical lens 100.

[0081] The first lens L1 has positive refractive power, a light exiting surface S1 of the first lens is a concave surface, and a light incident surface S2 of the first lens is a convex surface;

[0082] The second lens L2 has positive refractive power, a light exiting surface S3 of the second lens is a convex surface, and a light incident surface S4 of the second lens is a concave surface at the near optical axis;

[0083] The third lens L3 has negative power, a light exiting surface S5 of the third lens is convex, and a light incident surface S6 of the third lens is concave at the near optical axis;

[0084] The fourth lens L4 has negative optical power, a light exiting surface S7 of the fourth lens is a concave surface, and a light incident surface S8 of the fourth lens is a concave surface;

[0085] The fifth lens L5 has positive refractive power, a light exiting surface S9 of the fifth lens L5 is a convex surface, and a light incident surface S10 of the fifth lens L5 is a concave surface;

[0086] The sixth lens L6 has positive refractive power, a light exiting surface S11 of the sixth lens L6 is a convex surface, and a light incident surface S12 of the sixth lens L6 is a concave surface;

[0087] The seventh lens L7 has positive refractive power, a light exiting surface S13 of the seventh lens L7 is a convex surface, and a light incident surface S14 of the seventh lens L7 is a convex surface at the near optical axis;

[0088] The eighth lens L8 has negative optical power, a light exit surface S15 of the eighth lens L8 is convex at the near optical axis, and a light incident surface S16 of the eighth lens L8 is concave at the near optical axis;

[0089] The ninth lens L9 has negative refractive power, a light-exiting surface S17 of the ninth lens L9 is a concave surface, and a light-incident surface S18 of the ninth lens L9 is a concave surface.

[0090] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the sixth lens L6, the seventh lens L7, and the ninth lens L9 are all glass aspherical lenses; the fifth lens L5 and the eighth lens L8 are all plastic aspherical lenses.

[0091] In order to meet the wearing needs of users with different refractive degrees, the air spacing CT between the entire lens group (composed of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9) and the image source 10 on the optical axis can be dynamically adjusted. W (The distance between the light incident surface of the ninth lens L9 and the image source 10 on the optical axis) is used to realize the adjustment of the optical lens between different refractive powers, thereby being able to well meet the wearing needs of users with different refractive powers.

[0092] Specifically, in this embodiment, the distance CT between the light incident surface of the ninth lens and the image source side on the optical axis is W The adjustment range is 1.15~6.412mm, which can achieve -700~200 degrees (-7D~2D) of diopter adjustment, so that users with different degrees of myopia or hyperopia can have a good sensory experience when wearing it. Figure 2, which is a schematic diagram of the structure of the optical lens 100 when the diopter is 0D (0°). W is 5.021mm; when CT W When the CT W When the diameter of the optical lens 100 is 6.412 mm, the refractive power of the optical lens 100 is 2D (200°).

[0093] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0094] Table 1-1

[0095]

[0096] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0097] Table 1-2

[0098]

[0099] The corresponding parameters of the optical lens 100 in Example 1 under different refractive power states are shown in Tables 1-3.

[0100] Table 1-3

[0101]

[0102] Please refer to Figure 3 , which is a F-Tan(θ) distortion curve of the optical lens 100, wherein the horizontal axis represents the F-Tan(θ) distortion percentage, and the vertical axis represents the field of view angle (unit: degree). Figure 3 It can be seen that the F-Tan (θ) distortion value at the image height received by the user's eyes is controlled within ±2%, indicating that the distortion of the optical lens 100 is well corrected.

[0103] Please refer to Figure 4 , which is a field curvature curve of the optical lens 100, indicating the degree of curvature of light on the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±1.5mm, indicating that the optical lens 100 can correct the field curvature well.

[0104] Please refer to Figure 5, which is a vertical axis chromatic aberration curve of the optical lens 100, represents the chromatic aberration of each wavelength relative to the central wavelength (0.580 μm) at the image height received by the user's eyes, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. Figure 5 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1~15μm, indicating that the chromatic aberration of the optical lens 100 is well corrected.

[0105] from Figure 3 , Figure 4 , Figure 5 It can be seen that the aberration of the optical lens 100 is well balanced and has good imaging quality.

[0106] Example 2

[0107] See also Figure 6 , which is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main differences of this embodiment are: the fifth lens L5 has negative focal power; the sixth lens L6 has negative focal power; the light incident surface S4 of the second lens L2 is a convex surface; the light exit surface S5 of the third lens L3 is a concave surface; the light incident surface S6 of the third lens L3 is a convex surface; the light incident surface S18 of the ninth lens L9 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different; the optical parameters corresponding to different refractive powers are different, and the distance CT between the light incident surface of the ninth lens and the image source side on the optical axis is W The adjustment range is 1.099~6.554mm.

[0108] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0109] Table 2-1

[0110]

[0111] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0112] Table 2-2

[0113]

[0114] The corresponding parameters of the optical lens 200 in Example 2 under different refractive power states are shown in Table 2-3.

[0115] Table 2-3

[0116]

[0117] Please refer to Figure 7, which is a F-Tan(θ) distortion curve of the optical lens 200, wherein the horizontal axis represents the F-Tan(θ) distortion percentage, and the vertical axis represents the field of view angle (unit: degree). Figure 7 It can be seen that the F-Tan (θ) distortion value at the image height received by the user's eyes is controlled within ±2%, indicating that the distortion of the optical lens 200 is well corrected.

[0118] Please refer to Figure 8 , which is a field curvature curve of the optical lens 200, indicating the degree of curvature of light in the meridian image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within 0~2mm, indicating that the optical lens 200 can correct the field curvature well.

[0119] Please refer to Fig. 9 , which is a vertical axis chromatic aberration curve of the optical lens 200, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.580 μm) at the image height received by the user's eyes, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. Fig. 9 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1~20μm, indicating that the chromatic aberration of the optical lens 200 is well corrected.

[0120] from Figure 7 , Figure 8 , Fig. 9 It can be seen that the aberration of the optical lens 200 is well balanced and has good imaging quality.

[0121] Example 3

[0122] See also Fig.10 , which is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main differences of this embodiment are: the fifth lens L5 has negative optical power; the light incident surface S4 of the second lens L2 is a convex surface; the light exit surface S5 of the third lens L3 is a concave surface; the light incident surface S6 of the third lens L3 is a convex surface; the light incident surface S12 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different; the optical parameters corresponding to different refractive powers are different, and the distance CT between the light incident surface of the ninth lens and the image source side on the optical axis is W The adjustment range is 2.024~7.441mm.

[0123] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0124] Table 3-1

[0125]

[0126] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0127] Table 3-2

[0128]

[0129] The corresponding parameters of the optical lens 300 in Example 3 under different refractive power states are shown in Table 3-3.

[0130] Table 3-3

[0131]

[0132] Please refer to Fig.11 , which is a F-Tan(θ) distortion curve of the optical lens 300, wherein the horizontal axis represents the F-Tan(θ) distortion percentage, and the vertical axis represents the field of view angle (unit: degree). Fig.11 It can be seen that the F-Tan (θ) distortion value at the image height received by the user's eyes is controlled within ±2%, indicating that the distortion of the optical lens 300 is well corrected.

[0133] Please refer to Fig.12 , which is a field curvature curve of the optical lens 300, indicating the degree of curvature of light in the meridian image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within 0~2mm, indicating that the optical lens 300 can correct the field curvature well.

[0134] Please refer to Fig.13 , which is a vertical axis chromatic aberration curve of the optical lens 300, represents the chromatic aberration of each wavelength relative to the central wavelength (0.580 μm) at the image height received by the user's eyes, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. Fig.13 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -5~20μm, indicating that the chromatic aberration of the optical lens 300 is well corrected.

[0135] from Fig.11 , Fig.12 , Fig.13 It can be seen that the aberration of the optical lens 300 is well balanced and has good imaging quality.

[0136] Example 4

[0137] See also Fig.14, which is a schematic diagram of the structure of an optical lens 400 provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main differences of this embodiment are: the light incident surface S18 of the ninth lens L9 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different; the optical parameters corresponding to different refractive powers are different, and the distance CT between the light incident surface of the ninth lens and the image source side on the optical axis is W The adjustment range is 1.149~6.715mm.

[0138] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0139] Table 4-1

[0140]

[0141] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0142] Table 4-2

[0143]

[0144] The corresponding parameters of the optical lens 400 in Example 4 under different refractive power states are shown in Table 4-3.

[0145] Table 4-3

[0146]

[0147] Please refer to Fig.15 , which is a F-Tan(θ) distortion curve of the optical lens 400, wherein the horizontal axis represents the F-Tan(θ) distortion percentage, and the vertical axis represents the field of view angle (unit: degree). Fig.15 It can be seen that the F-Tan (θ) distortion value at the image height received by the user's eyes is controlled within ±2%, indicating that the distortion of the optical lens 400 is well corrected.

[0148] Please refer to Fig.16 , which is a field curvature curve of the optical lens 400, indicating the degree of curvature of light in the meridian image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±1mm, indicating that the optical lens 400 can correct the field curvature well.

[0149] Please refer to Fig.17, which is a vertical axis chromatic aberration curve of the optical lens 400, represents the chromatic aberration of each wavelength relative to the central wavelength (0.580 μm) at the image height received by the user's eyes, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. Fig.17 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~20μm, indicating that the chromatic aberration of the optical lens 400 is well corrected.

[0150] from Fig.15 , Fig.16 , Fig.17 It can be seen that the aberration of the optical lens 400 is well balanced and has good imaging quality.

[0151] Example 5

[0152] See also Fig.18 , which is a schematic diagram of the structure of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, the main differences of this embodiment are: the fifth lens L5 has negative optical power; the light incident surface S4 of the second lens L2 is a convex surface; the light exit surface S5 of the third lens L3 is a concave surface; the light incident surface S6 of the third lens L3 is a convex surface; the light incident surface S18 of the ninth lens L9 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different; the optical parameters corresponding to different refractive powers are different, and the distance CT between the light incident surface of the ninth lens and the image source side on the optical axis is W The adjustment range is 1.099~6.555mm.

[0153] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0154] Table 5-1

[0155]

[0156] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0157] Table 5-2

[0158]

[0159] The corresponding parameters of the optical lens 500 in Example 5 under different refractive power states are shown in Table 5-3.

[0160] Table 5-3

[0161]

[0162] Please refer to Fig.19, which is a F-Tan(θ) distortion curve of the optical lens 500, wherein the horizontal axis represents the F-Tan(θ) distortion percentage, and the vertical axis represents the field of view angle (unit: degree). Fig.19 It can be seen that the F-Tan (θ) distortion value at the image height received by the user's eyes is controlled within ±2%, indicating that the distortion of the optical lens 500 is well corrected.

[0163] Please refer to Fig. 20 , which is a field curvature curve of the optical lens 500, indicating the degree of curvature of light on the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within 0~2mm, indicating that the optical lens 500 can correct the field curvature well.

[0164] Please refer to Fig.21 , which is a vertical axis chromatic aberration curve of the optical lens 500, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.550 μm) at the image height received by the user's eyes, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. Fig.21 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~20μm, indicating that the chromatic aberration of the optical lens 500 is well corrected.

[0165] from Fig.19 , Fig. 20 , Fig.21 It can be seen that the aberration of the optical lens 500 is well balanced and has good imaging quality.

[0166] Example 6

[0167] See also Fig. 22 , which is a schematic diagram of the structure of an optical lens 600 provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main differences of this embodiment are as follows: the fourth lens L4 is a plastic aspheric lens; the optical parameters such as the curvature radius and lens thickness of each lens surface are different; the optical parameters corresponding to different refractive powers are different, and the distance CT between the light incident surface and the image source side on the optical axis of the ninth lens is W The adjustment range is 1.191~6.849mm.

[0168] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0169] Table 6-1

[0170]

[0171] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0172] Table 6-2

[0173]

[0174] The corresponding parameters of the optical lens 600 in Example 6 under different refractive power states are shown in Table 6-3.

[0175] Table 6-3

[0176]

[0177] Please refer to Fig.23 , which is a F-Tan(θ) distortion curve of the optical lens 600, wherein the horizontal axis represents the F-Tan(θ) distortion percentage, and the vertical axis represents the field of view angle (unit: degree). Fig.23 It can be seen that the F-Tan (θ) distortion value at the image height received by the user's eyes is controlled within ±2%, indicating that the distortion of the optical lens 600 is well corrected.

[0178] Please refer to Fig.24 , which is a field curvature curve of the optical lens 600, indicating the degree of curvature of light in the meridian image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±1mm, indicating that the optical lens 600 can correct the field curvature well.

[0179] Please refer to Fig.25 , which is a vertical axis chromatic aberration curve of the optical lens 600, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.580 μm) at the image height received by the user's eyes, the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. Fig.25 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~20μm, indicating that the chromatic aberration of the optical lens 600 is well corrected.

[0180] from Fig.23 , Fig.24 , Fig.25 It can be seen that the aberration of the optical lens 600 is well balanced and has good imaging quality.

[0181] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided by the above six embodiments when the diopter is 0D (0°), including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the maximum field of view FOV, the axial distance TL from the light exit surface of the first lens to the light entrance surface of the ninth lens, the entrance pupil diameter EPD, the exit pupil distance ED, and the display area length IH of the image source that the optical lens can match, and the numerical value corresponding to each conditional expression in each embodiment.

[0182] Table 7

[0183]

[0184] In summary, the optical lens provided by the present invention has at least the following advantages:

[0185] (1) Through specific surface shape settings and reasonable optical focal length distribution, the optical lens has a larger field of view angle. The larger field of view angle can provide a wide field of view display effect, giving users a better experience.

[0186] (2) The optical lens also has a larger image surface and higher resolution, which can match large-size image sources to achieve high-definition imaging, improve imaging quality, and bring users an excellent sensory experience.

[0187] (3) Different diopter adjustments can be achieved by adjusting the spatial distance between the lens group and the image source on the optical axis. A wide range of diopter adjustments (-7D to +2D) can be achieved, and all have high imaging quality, which can meet the needs of different myopic users. At the same time, it has a large exit pupil distance (ED>12mm), which can provide users with a better experience.

[0188] Example 7

[0189] See also Fig.26 , which is a schematic diagram of an optical path in a near-eye display device 700 provided by an embodiment of the present invention, the near-eye display device 700 includes an image source 10, an optical lens (such as optical lens 100) in any of the aforementioned embodiments of the present application, and the optical lens 100 is located between the human eye 20 and the image source 10. The image information emitted from the image source 10 enters the human eye 20 through the optical lens 100 to form an image, and a high-definition magnified virtual image can be observed in the human eye 20, which has an extremely realistic sensory experience.

[0190] The image source 10 is used to emit a light signal, and the light signal includes image information. Specifically, the image source 10 can be one of a display screen such as Micro LED, OLED, LCD, LCOS, M-OLED, etc., and can provide high-definition image information for the optical lens 100.

[0191] The optical lens 100 is arranged in the light emitting direction of the image source 10 , and the ninth lens in the optical lens 100 is arranged closer to the image source 10 than the first lens. The optical lens 100 is used to modulate the light signal emitted by the image source 10 and transmit it to the human eye 20 .

[0192] The near-eye display device 700 can be VR glasses, VR helmets, head-mounted display devices, etc. By adjusting the distance between the lens and the image source side, the diopter can be adjusted (-7D~2D), so that users with different degrees of myopia or hyperopia can have a better wearing experience. Since the above-mentioned optical lens has a large field of view, the large field of view can provide a wide field of view display effect, improve the user's sense of immersion, and thus bring a better experience to the user. At the same time, the optical lens also has a large image surface and a high resolution. The light signal image modulated by the optical lens is bright and clear, the effect is better, and the picture projected to the human eye is clearer. Therefore, the near-eye display device equipped with the optical lens has at least the characteristics of a wide field of view and high image quality, which can effectively improve the user's visual experience and comfort.

[0193] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0194] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, consisting of nine lenses, characterized in that: The optical components include: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power, from the entrance pupil side of the human eye to the image source side in the reverse direction of light transmission; The first group includes, from the entrance pupil side of the human eye to the image source side, a first lens with positive optical power and a second lens with positive optical power; The second group includes, from the entrance pupil side of the human eye to the image source side, a third lens having negative optical power, a fourth lens having negative optical power, a fifth lens, a sixth lens, and a seventh lens having positive optical power; The third group includes, from the entrance pupil side of the human eye to the image source side, an eighth lens having negative optical power and a ninth lens having negative optical power; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens each include a light incident surface close to the image source side and a light exit surface close to the entrance pupil side of the human eye; Wherein, the distance CT between the light incident surface of the ninth lens and the image source on the optical axis is W The range is adjustable and meets: 1mm <CT W <8mm; The combined focal length f of the first group Q1 The effective focal length f of the optical lens satisfies: 0.5 <f Q1 / f<2.5; The combined focal length f of the second group Q2 The effective focal length f of the optical lens satisfies: 0.4 <f Q2 / f<0.9; The combined focal length f of the third group Q3 The effective focal length f of the optical lens satisfies: -0.8 <f Q3 / f<-0.

4.

2. The optical lens according to claim 1, characterized in that: The axial distance TL from the light exiting surface of the first lens to the light incident surface of the ninth lens and the effective focal length f of the optical lens satisfy: 1.45 <TL / f<1.6。 3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: <f1 / f<30。 4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.5 <f2 / f<3。 5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f<-2.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: <f4 / f<-0.5。 7. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 0.2 <f7 / f<0.9。 8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -1.8 <f8 / f<-0.5。 9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f9 of the ninth lens satisfy: <f9 / f<-0.5。 10. The optical lens according to claim 1, characterized in that: The exit pupil distance ED of the optical lens and the effective focal length f of the optical lens satisfy: 0.45 <ED / f<0.6。 11. A near-eye display device, characterized in that: The optical signal transmission direction includes: an image source, an optical lens according to any one of claims 1 to 10; The image source is used to emit a light signal, and the light signal includes image information; The optical lens is arranged in the light emitting direction of the image source, and the ninth lens is arranged closer to the image source than the first lens. The optical lens is used to modulate the light signal emitted by the image source and transmit it to the human eye.

Images