A VR / AR glasses detects lens

Abstract

The application discloses a VR / AR glasses detection lens, which comprises, in sequence from the object side to the image side along the optical axis, an aperture, a first group, a second group, a third group and a fourth group, and each of the first group, the second group, the third group and the fourth group comprises at least one lens; the VR / AR glasses detection lens satisfies 1 < fg1 / f < 2, 2.5 < fg2 / f < 3.2, 6 < fg3 / f < 8 and 5 < fg4 / f < 6, wherein f is the focal length of the VR / AR glasses detection lens, and fg1, fg2, fg3 and fg4 are the focal lengths of the first group, the second group, the third group and the fourth group respectively. The VR / AR glasses detection lens has a clear, uniform and high-resolution imaging picture, can be matched with a 61M resolution full-frame sensor, can have a large imaging picture size and high resolution, can reach a super-large field angle of 120°, can well simulate human eye observation, can adopt two designs of a straight type and a turning type, is suitable and flexible, and adopts a 4mm aperture size, so that the measurement system can be measured under the same conditions as human eye observation.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and more particularly, to a VR / AR glasses detection lens. Background Art

[0002] With the continuous development of VR / AR technologies and applications, in order to provide better user experiences in various fields, the imaging requirements for VR / AR devices in the market are constantly increasing, which poses certain requirements for the detection lenses of VR / AR glasses.

[0003] Currently, the existing methods for detecting VR / AR glasses generally use an industrial camera and a detection lens to form an artificial eye camera at the exit pupil position of the VR / AR glasses to replace the human eye to obtain images, and analyze the imaging situation of the VR / AR glasses on the industrial camera through software to determine whether the VR / AR glasses meet the requirements. However, the existing VR / AR glasses detection lenses can support a large frame size with low resolution, or a high resolution with a small frame size, resulting in poor detection effects and unable to combine a large frame size and high resolution; moreover, the detection field of view of the existing detection lenses is small, and it cannot well simulate the human eye visual experience; in addition, the existing VR / AR detection lenses all adopt a straight-line optical path design, with poor adaptability.

[0004] In view of this, the inventors of the present application have invented a VR / AR glasses detection lens. Summary of the Invention

[0005] The purpose of the present invention is to provide a VR / AR glasses detection lens that combines a large frame size, high resolution, and a large viewing angle.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A VR / AR glasses detection lens sequentially comprises, along the optical axis from the object side to the image side: an aperture stop, a first group, a second group, a third group, and a fourth group, and each of the first group, the second group, the third group, and the fourth group includes at least one lens;

[0007] The VR / AR glasses detection lens satisfies: 1 < fg1 / f < 2, 2.5 < fg2 / f < 3.2, 6 < fg3 / f < 8, 5 < fg4 / f < 6, where f is the focal length of the VR / AR glasses detection lens, and fg1, fg2, fg3, and fg4 are the focal lengths of the first group, the second group, the third group, and the fourth group, respectively.

[0008] Further, along the optical axis from the object side to the image side:

[0009] The first group sequentially comprises: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens;

[0010] The second group successively includes: a sixth lens, a seventh lens, and an eighth lens;

[0011] The third group successively includes: a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens;

[0012] The fourth group successively includes: a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, an eighteenth lens, and a nineteenth lens.

[0013] Further, the first lens, the second lens, and the third lens are all crescent lenses, and satisfy:

[0014] Nd1 > 1.85, -2 < f1 / f < -1, 1.5 < f2 / f < 2.5, 4 < f3 / f < 6,

[0015] where, Nd1 is the refractive index of the first lens, and f1, f2, and f3 are the focal lengths of the first lens, the second lens, and the third lens, respectively.

[0016] Further, the first lens and the second lens are glued to each other, the sixth lens and the seventh lens are glued to each other, the fourteenth lens and the fifteenth lens are glued to each other, and the seventeenth lens and the eighteenth lens are glued to each other, and satisfy:

[0017] Vd2 - Vd1 > 45, Vd6 - Vd7 > 30, Vd15 - Vd14 > 40, Vd18 - Vd17 > 40,

[0018] where, Vd1, Vd2, Vd6, Vd7, Vd14, Vd15, Vd17, and Vd18 are the Abbe numbers of the first lens, the second lens, the sixth lens, the seventh lens, the fourteenth lens, the fifteenth lens, the seventeenth lens, and the eighteenth lens, respectively.

[0019] Further, the ninth lens and the tenth lens are glued to each other, the eleventh lens and the twelfth lens are glued to each other, and the two glued lens groups form a double Gauss structure, and satisfy:

[0020] -3 < f910 / f < -1, -8 < f1112 / f < -6, where, f910 is the combined focal length of the ninth lens and the tenth lens, and f1112 is the combined focal length of the eleventh lens and the twelfth lens.

[0021] Further, the nineteenth lens is an aspherical lens, and satisfies: -3.5 < f19 / f < -2, where, f19 is the focal length of the nineteenth lens.

[0022] Furthermore, the VR / AR glasses detection lens satisfies the following condition: FOV ≤ 120°, where FOV is the field of view of the VR / AR glasses detection lens.

[0023] Furthermore, the fifth lens is a prism used to reflect the light from the fourth lens into the sixth lens. The prism includes an incident surface facing the fourth lens, an exit surface facing the sixth lens, and a reflecting surface connecting the incident surface and the exit surface. The angle between the incident surface and the exit surface is a right angle.

[0024] Furthermore, the fifth lens is a flat plate lens, including an incident surface facing the fourth lens and into which the imaging light enters, and an exit surface facing the sixth lens and out which the imaging light exits, wherein both the incident surface and the exit surface are planar.

[0025] Furthermore, each of the first to fourth lenses and the sixth to nineteenth lenses includes an incident surface into which imaging rays enter and an exit surface into which imaging rays exit.

[0026] The first lens has negative refractive power, and the light-incident surface of the first lens is concave, while the light-outceasing surface is convex.

[0027] The second lens has positive refractive power, and the light-incident surface of the second lens is concave, while the light-outceasing surface is convex.

[0028] The third lens has positive refractive power, and the incident surface of the third lens is concave, while the exit surface is convex.

[0029] The fourth lens has positive refractive power, and the incident surface and the exit surface of the fourth lens are both convex.

[0030] The sixth lens has positive diopter, and the incident surface and the exit surface of the sixth lens are both convex.

[0031] The seventh lens has negative refractive power, and the incident surface of the seventh lens is concave, while the exit surface is convex.

[0032] The eighth lens has positive diopter, and the incident surface of the eighth lens is convex, while the exit surface is either convex or flat.

[0033] The ninth lens has positive diopter, and the incident surface and the exit surface of the ninth lens are both convex.

[0034] The tenth lens has negative refractive power, and the incident surface of the tenth lens is concave, and the exit surface of the tenth lens is concave.

[0035] The eleventh lens has negative refractive power, and the incident surface of the eleventh lens is concave, and the exit surface of the eleventh lens is concave.

[0036] The twelfth lens has positive refractive power, and the incident surface and the exit surface of the twelfth lens are both convex.

[0037] The thirteenth lens has positive diopter, and the incident surface and the exit surface of the thirteenth lens are both convex.

[0038] The fourteenth lens has negative refractive power, and the incident surface of the fourteenth lens is concave, and the exit surface of the fourteenth lens is concave.

[0039] The fifteenth lens has positive refractive power, and the incident surface and the exit surface of the fifteenth lens are both convex.

[0040] The sixteenth lens has positive refractive power, and the incident surface and the exit surface of the sixteenth lens are both convex.

[0041] The seventeenth lens has negative refractive power, and the incident surface of the seventeenth lens is convex, while the exit surface is concave.

[0042] The eighteenth lens has positive refractive power, and the incident surface of the eighteenth lens is convex, while the exit surface is concave.

[0043] The nineteenth lens has negative refractive power, and the incident surface of the nineteenth lens is concave, while the exit surface is convex.

[0044] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0045] This invention provides VR / AR glasses with a detection lens that produces clear, uniform, and high-resolution images. Paired with a 61M resolution full-frame sensor, it combines a large image size with high resolution. It also features an ultra-wide field of view of up to 120°, effectively simulating human eye observation. It can be designed in both vertical and angled configurations, offering flexibility. The 4mm aperture size better matches the human pupil size, allowing the measurement system to perform measurements under conditions identical to human vision. Attached Figure Description

[0046] Figure 1 This is the optical path diagram of the folding lens in Embodiment 1 of the present invention;

[0047] Figure 2 This is the optical path diagram of the inline lens of Embodiment 1 of the present invention;

[0048] Figure 3 This is the MTF curve of the lens in Embodiment 1 of the present invention under visible light;

[0049] Figure 4 This is a lateral chromatic aberration curve of the lens under visible light in Embodiment 1 of the present invention;

[0050] Figure 5 This is a field curvature and distortion diagram of the lens in Embodiment 1 of the present invention under visible light;

[0051] Figure 6 This is the optical path diagram of the folding lens in Embodiment 2 of the present invention;

[0052] Figure 7 This is the optical path diagram of the inline lens in Embodiment 2 of the present invention;

[0053] Figure 8 This is the MTF curve of the lens in Embodiment 2 of the present invention under visible light;

[0054] Figure 9 This is a lateral chromatic aberration curve of the lens under visible light in Embodiment 2 of the present invention;

[0055] Figure 10 This is a field curvature and distortion diagram of the lens under visible light in Embodiment 2 of the present invention;

[0056] Figure 11 This is the optical path diagram of the folding lens in Embodiment 3 of the present invention;

[0057] Figure 12 This is the optical path diagram of the inline lens in Embodiment 3 of the present invention;

[0058] Figure 13 This is the MTF curve of the lens in Embodiment 3 of the present invention under visible light;

[0059] Figure 14 This is a lateral chromatic aberration curve of the lens under visible light in Embodiment 3 of the present invention;

[0060] Figure 15 This is a field curvature and distortion diagram of the lens under visible light in Embodiment 3 of the present invention;

[0061] Figure 16 This is the optical path diagram of the folding lens in Embodiment 4 of the present invention;

[0062] Figure 17 This is the optical path diagram of the inline lens in Embodiment 4 of the present invention;

[0063] Figure 18 This is the MTF curve of the lens in Embodiment 4 of the present invention under visible light;

[0064] Figure 19 This is a lateral chromatic aberration curve of the lens under visible light in Embodiment 4 of the present invention;

[0065] Figure 20 This is a field curvature and distortion diagram of the lens under visible light in Embodiment 4 of the present invention.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 51. Incident surface; 52. Exit surface; 53. Reflecting surface; 6. Sixth lens; 7. Seventh lens; 8. Eighth lens; 9. Ninth lens; 10. Tenth lens; 11. Eleventh lens; 12. Twelfth lens; 13. Thirteenth lens; 14. Fourteenth lens; 15. Fifteenth lens; 16. Sixteenth lens; 17. Seventeenth lens; 18. Eighteenth lens; 19. Nineteenth lens; 20. Aperture; Q1. First group; Q2. Second group; Q3. Third group; Q4. Fourth group. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0069] The phrase "a lens has a positive (or negative) refractive index" refers to the lens having a positive (or negative) paraxial refractive index calculated using Gaussian optics theory. The "incident surface (or exit surface)" of the lens is defined as the specific area through which the imaging ray passes on the lens surface. The convexity or concavity of a lens surface can be determined using methods commonly employed in the field, namely by the sign of the radius of curvature (R-value). R-values ​​are commonly used in optical design software such as Zemax or CodeV. R-values ​​are also frequently found in lens data sheets within optical design software. For the incident surface, a positive R-value indicates a convex surface, while a negative R-value indicates a concave surface. Conversely, for the exit surface, a positive R-value indicates a concave surface, while a negative R-value indicates a convex surface.

[0070] This invention discloses a VR / AR glasses detection lens, which is mainly used to simulate human eye imaging to detect the imaging status of VR / AR glasses. It includes, along the optical axis from the object side to the image side, an aperture 20, a first group Q1, a second group Q2, a third group Q3 and a fourth group Q4, and each of the first group Q1, the second group Q2, the third group Q3 and the fourth group Q4 includes at least one lens.

[0071] Among them, by placing the aperture 20 in front, compared with a traditional lens where the aperture is inside the lens, when the aperture is inside the lens, the light will be blocked and a complete field of view cannot be collected; when the aperture 20 is placed in front, there is no blockage, effectively increasing its field of view angle, and a complete field of view similar to that of the human eye can be obtained, better simulating the visual experience of the human eye. For this VR / AR glasses detection lens, the aperture size is 4mm, which better matches the pupil size of the human eye, enabling the measurement system to measure under the same conditions as when the human eye is viewing, and the design allows for the replacement of apertures of different sizes.

[0072] This VR / AR glasses detection lens satisfies: 1 < fg1 / f < 2, 2.5 < fg2 / f < 3.2, 6 < fg3 / f < 8, 5 < fg4 / f < 6, where f is the focal length of this VR / AR glasses detection lens, and fg1, fg2, fg3, and fg4 are the focal lengths of the first group Q1, the second group Q2, the third group Q3, and the fourth group Q4 respectively.

[0073] In some embodiments, this VR / AR glasses detection lens along the optical axis from the object side to the image side:

[0074] The first group successively includes: the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5;

[0075] The second group successively includes: the sixth lens 6, the seventh lens 7, the eighth lens 8;

[0076] The third group successively includes: the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13;

[0077] The fourth group successively includes: the fourteenth lens 14, the fifteenth lens 15, the sixteenth lens 16, the seventeenth lens 17, the eighteenth lens 18, the nineteenth lens 19.

[0078] The focal lengths of the four groups satisfy the above relational expressions. By reasonably matching the focal lengths and lenses of each group, there is a higher resolution and a super-large field of view angle, and it can well simulate human eye observation.

[0079] In some embodiments, the first lens 1, the second lens 2, and the third lens 3 are all crescent-shaped lenses, and satisfy: Nd1 > 1.85, -2 < f1 / f < -1, 1.5 < f2 / f < 2.5, 4 < f3 / f < 6, where Nd1 is the refractive index of the first lens 1, and f1, f2, and f3 are the focal lengths of the first lens 1, the second lens 2, and the third lens 3 respectively.

[0080] The VR / AR glasses detection lens meets the above conditions, which can make light enter the lens better, enabling it to have a 120° field of view, improving the resolution, and also better controlling optical distortion.

[0081] In some embodiments, the first lens 1 and the second lens 2 are glued together, the sixth lens 6 and the seventh lens 7 are glued together, the fourteenth lens 14 and the fifteenth lens 15 are glued together, and the seventeenth lens 17 and the eighteenth lens 18 are glued together, and satisfy: Vd2 - Vd1 > 45, Vd6 - Vd7 > 30, Vd15 - Vd14 > 40, Vd18 - Vd17 > 40, where Vd1, Vd2, Vd6, Vd7, Vd14, Vd15, Vd17, Vd18 are the Abbe numbers of the first lens 1, the second lens 2, the sixth lens 6, the seventh lens 7, the fourteenth lens 14, the fifteenth lens 15, the seventeenth lens 17, and the eighteenth lens 18, respectively.

[0082] The VR / AR glasses detection lens meeting the above relational expressions can help eliminate the influence of chromatic aberration, reduce field curvature, correct coma, and the glued lenses can reduce the tilt / eccentricity generated during the assembly process, improving the imaging quality.

[0083] In some embodiments, the ninth lens 9 and the tenth lens 10 are glued together, the eleventh lens 11 and the twelfth lens 12 are glued together, and the two glued lens groups form a double Gauss structure, and satisfy: -3 < f910 / f < -1, -8 < f1112 / f < -6, where f910 is the combined focal length of the ninth lens 9 and the tenth lens 10, and f1112 is the combined focal length of the eleventh lens 11 and the twelfth lens 12.

[0084] The VR / AR glasses detection lens meeting the above relational expressions can better eliminate high-order aberrations, improve the system performance, and at the same time can also reduce the tolerance sensitivity problems such as tilt / eccentricity generated by the lenses during the assembly process.

[0085] In some embodiments, the nineteenth lens 19 is an aspherical lens, and satisfies: -3.5 < f19 / f < -2, where f19 is the focal length of the nineteenth lens 19. The VR / AR glasses detection lens meeting the above relational expressions can thus correct the residual high-order aberrations of the front group of lenses, such as correcting field curvature and astigmatism, while reducing the main light incident angle and the energy loss of the incident sensor.

[0086] In some embodiments, each of the first lens 1 to the fourth lens 4, and the sixth lens 6 to the nineteenth lens 19 includes an incident light surface for imaging light to enter and an exit light surface for imaging light to exit;

[0087] The first lens 1 has negative refractive power, and the light-incident surface of the first lens 1 is concave and the light-outceasing surface is convex.

[0088] The second lens 2 has positive diopter, and the light-incident surface of the second lens 2 is concave, while the light-outceasing surface is convex.

[0089] The third lens 3 has positive refractive power, and the light-incident surface of the third lens 3 is concave, while the light-outceasing surface is convex.

[0090] The fourth lens 4 has positive refractive power, and the light-incident surface of the fourth lens 4 is convex, and the light-exit surface is convex.

[0091] The sixth lens 6 has positive diopter, and the light-incident surface of the sixth lens 6 is convex, and the light-exit surface is convex.

[0092] The seventh lens 7 has negative refractive power, and the light-incident surface of the seventh lens 7 is concave, while the light-outceasing surface is convex.

[0093] The eighth lens 8 has positive diopter, and the incident surface of the eighth lens 8 is convex, while the exit surface is either convex or flat.

[0094] The ninth lens 9 has positive diopter, and the light-incident surface of the ninth lens 9 is convex, and the light-exit surface is convex.

[0095] The tenth lens 10 has negative refractive power, and the incident surface of the tenth lens 10 is concave, and the exit surface is concave.

[0096] The eleventh lens 11 has negative refractive power, and the incident surface of the eleventh lens 11 is concave, and the exit surface is concave.

[0097] The twelfth lens 12 has positive refractive power, and the light-incident surface of the twelfth lens 12 is convex, and the light-exit surface is convex.

[0098] The thirteenth lens 13 has positive refractive power, and the incident surface of the thirteenth lens 13 is convex, and the exit surface is convex.

[0099] The fourteenth lens 14 has negative refractive power, and the light-incident surface of the fourteenth lens 14 is concave, and the light-exit surface is concave.

[0100] The fifteenth lens 15 has positive refractive power, and the light-incident surface of the fifteenth lens 15 is convex, and the light-exit surface is convex.

[0101] The sixteenth lens 16 has positive refractive power, and the light-incident surface of the sixteenth lens 16 is convex, and the light-exit surface is convex.

[0102] The seventeenth lens 17 has negative refractive power, and the light-incident surface of the seventeenth lens 17 is convex and the light-outceasing surface is concave.

[0103] The eighteenth lens 18 has positive refractive power, and the incident surface of the eighteenth lens 18 is convex and the exit surface is concave.

[0104] The nineteenth lens 19 has negative refractive power, and the incident surface of the nineteenth lens 19 is concave and the exit surface is convex.

[0105] By properly combining the refractive power and shape of each lens, higher resolution and a larger field of view can be achieved, which can well simulate human eye observation.

[0106] In some embodiments, the fifth lens 5 is a flat plate lens, including an incident surface 51 facing the fourth lens 4 and through which imaging light enters, and an exit surface 52 facing the sixth lens 6 and through which imaging light exits. Both the incident surface 51 and the exit surface 52 are planar. Preferably, the flat plate lens is a flat glass plate, and its incident surface 51 and exit surface 52 are parallel to each other and are both planar.

[0107] Specifically, the light emitted from the fourth lens 4 passes through the incident surface 51 of the fifth lens 5 (flat lens) and enters the sixth lens 6 through the exit surface 52 of the fifth lens 5 (flat lens).

[0108] In some embodiments, the fifth lens 5 is a prism used to reflect the light from the fourth lens 4 into the sixth lens 6. The prism includes an incident surface 51 facing the fourth lens 4, an exit surface 52 facing the sixth lens 6, and a reflecting surface 53 connecting the incident surface 51 and the exit surface 52. The angle between the incident surface 51 and the exit surface 52 is a right angle.

[0109] Specifically, the light emitted from the fourth lens 4 passes through the incident surface 51 of the fifth lens 5 (prism) and is projected onto the reflecting surface 53 of the fifth lens 5 (prism). At the same time, the light is reflected by the reflecting surface 53 of the fifth lens 5 (prism) to the exit surface 52 of the fifth lens 5 (prism) and enters the sixth lens 6.

[0110] The fifth lens 5 adopts a right-angled edge to change the direction of the light path, so that the optical axis can be turned by about 90 degrees. In this way, the lens can adopt a turning design. This design can be used for devices with limited space in one direction.

[0111] The VR / AR glasses' detection lens meets the following requirement: FOV ≤ 120°, where FOV is the field of view of the VR / AR glasses' detection lens. This ultra-large field of view of up to 120° can effectively simulate human eye observation and is compatible with most AV / VR devices on the market.

[0112] The VR / AR glasses' detection lens produces clear, uniform, and high-resolution images, paired with a 61M resolution full-frame sensor for image quality evaluation.

[0113] The VR / AR glasses detection lens of the present invention will be described in detail below with reference to specific embodiments.

[0114] Example 1

[0115] Reference Figure 1 , Figure 2 As shown, this invention discloses a VR / AR glasses detection lens, which includes, along the optical axis from the object side to the image side, the following components in sequence: an aperture stop 20, a first group, a second group, a third group, and a fourth group. The first group includes, in sequence, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5; the second group includes, in sequence, a sixth lens 6, a seventh lens 7, and an eighth lens 8; the third group includes, in sequence, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, and a thirteenth lens 13; and the fourth group includes, in sequence, a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16, a seventeenth lens 17, an eighteenth lens 18, and a nineteenth lens 19.

[0116] The first lens 1 to the fourth lens 4 and the sixth lens 6 to the nineteenth lens 19 each include an incident surface into which imaging light rays enter and an exit surface into which imaging light rays exit.

[0117] The first lens 1 has negative refractive power, and the light-incident surface of the first lens 1 is concave and the light-outceasing surface is convex.

[0118] The second lens 2 has positive diopter, and the light-incident surface of the second lens 2 is concave, while the light-outceasing surface is convex.

[0119] The third lens 3 has positive refractive power, and the light-incident surface of the third lens 3 is concave, while the light-outceasing surface is convex.

[0120] The fourth lens 4 has positive refractive power, and the light-incident surface of the fourth lens 4 is convex, and the light-exit surface is convex.

[0121] The fifth lens 5 is a right-angle prism or a flat lens: when the fifth lens 5 is a right-angle prism, its optical path is as follows: Figure 1 As shown, when the fifth lens 5 is a flat plate lens, its optical path is as follows: Figure 2 As shown;

[0122] The sixth lens 6 has positive diopter, and the light-incident surface of the sixth lens 6 is convex, and the light-exit surface is convex.

[0123] The seventh lens 7 has negative refractive power, and the light-incident surface of the seventh lens 7 is concave, while the light-outceasing surface is convex.

[0124] The eighth lens 8 has positive diopter, and the incident surface of the eighth lens 8 is convex, while the exit surface is planar;

[0125] The ninth lens 9 has positive diopter, and the light-incident surface of the ninth lens 9 is convex, and the light-exit surface is convex.

[0126] The tenth lens 10 has negative refractive power, and the incident surface of the tenth lens 10 is concave, and the exit surface is concave.

[0127] The eleventh lens 11 has negative refractive power, and the incident surface of the eleventh lens 11 is concave, and the exit surface is concave.

[0128] The twelfth lens 12 has positive refractive power, and the light-incident surface of the twelfth lens 12 is convex, and the light-exit surface is convex.

[0129] The thirteenth lens 13 has positive refractive power, and the incident surface of the thirteenth lens 13 is convex, and the exit surface is convex.

[0130] The fourteenth lens 14 has negative refractive power, and the light-incident surface of the fourteenth lens 14 is concave, and the light-exit surface is concave.

[0131] The fifteenth lens 15 has positive refractive power, and the light-incident surface of the fifteenth lens 15 is convex, and the light-exit surface is convex.

[0132] The sixteenth lens 16 has positive refractive power, and the light-incident surface of the sixteenth lens 16 is convex, and the light-exit surface is convex.

[0133] The seventeenth lens 17 has negative refractive power, and the light-incident surface of the seventeenth lens 17 is convex and the light-outceasing surface is concave.

[0134] The eighteenth lens 18 has positive refractive power, and the incident surface of the eighteenth lens 18 is convex and the exit surface is concave.

[0135] The nineteenth lens 19 has negative refractive power, and the incident surface of the nineteenth lens 19 is concave and the exit surface is convex.

[0136] Detailed optical data for this specific embodiment are shown in Table 1-1.

[0137] Table 1-1 Detailed optical data for Example 1

[0138]

[0139]

[0140] The aspherical data in this embodiment are shown in Table 1-2.

[0141] Table 1-2 Aspherical data from Example 1

[0142]

[0143] In this embodiment, the values ​​of some lens parameters are as follows.

[0144] Table 1-3 Lens parameters of Example 1

[0145]

[0146]

[0147] In this embodiment, please refer to the MTF curve of the lens under visible light. Figure 3 As can be seen from the figure, when the spatial frequency of this lens reaches 65 l p / mm, the MTF value is greater than 0.5, indicating excellent image quality and high lens resolution.

[0148] Please refer to the lateral chromatic aberration curve of the lens under visible light. Figure 4 As can be seen from the figure, the lateral color difference is less than 2um, indicating a small color difference and high image color reproduction.

[0149] Please refer to the field curvature and distortion diagram of the lens under visible light. Figure 5 As can be seen from the figure, the optical distortion of the system is <|-35%|, which is small and results in high imaging quality.

[0150] Example 2

[0151] like Figure 6 , Figure 7 As shown, compared with Example 1, the main difference in this embodiment lies in the optical parameters such as the radius of curvature and lens thickness of each lens surface. In particular, the light-incident surface of the eighth lens 8 is convex, and the light-exit surface is also convex.

[0152] Detailed optical data for this specific embodiment are shown in Table 2-1.

[0153] Table 2-1 Detailed optical data for Example 2

[0154]

[0155]

[0156] The aspherical data in this embodiment are shown in Table 2-2.

[0157] Table 2-2 Aspherical data from Example 2

[0158] surface 32 33 k -5.246E-01 0 A4 1.545E-04 1.669E-04 A6 -1.054E-06 -9.436E-07 A8 6.927E-10 1.136E-09 A10 2.947E-11 1.700E-11 A12 -1.402E-13 -7.161E-14

[0159] In this embodiment, the values ​​of some lens parameters are as follows.

[0160] Table 2-3 Lens parameters of Example 2

[0161] type data type data type data fg1 / f 1.49 f 15.5 f10 -11.0 fg2 / f 2.72 f1 -21.3 f11 -15.4 fg3 / f 7.67 f2 31.3 f12 26.9 fg4 / f 5.07 f3 63.4 f13 48.2 f1 / f -1.37 f4 81.6 f14 -27.0 f2 / f 2.02 f5 Infinity f15 37.2 f3 / f 4.09 f6 42.8 f16 40.9 f19 / f -2.73 f7 -46.2 f17 -36.2 f910 / f -1.81 f8 45.0 f18 31.2 f1112 / f -6.55 f9 26.1 f19 -42.3

[0162] In this embodiment, please refer to the MTF curve of the lens under visible light. Figure 8 As can be seen from the figure, when the spatial frequency of this lens reaches 65 lp / mm, the MTF value is greater than 0.5, indicating excellent image quality and high lens resolution.

[0163] Please refer to the lateral chromatic aberration curve of the lens under visible light. Figure 9 As can be seen from the figure, the lateral color difference is less than 2.5um, indicating a small color difference and high image color reproduction.

[0164] Please refer to the field curvature and distortion diagram of the lens under visible light. Figure 10 As can be seen from the figure, the optical distortion of the system is <|-35%|, which is small and results in high imaging quality.

[0165] Example 3

[0166] like Figure 11 , Figure 12 As shown, the main difference between this embodiment and Embodiment 1 lies in the optical parameters such as the radius of curvature and lens thickness of each lens surface.

[0167] Detailed optical data for this specific embodiment are shown in Table 3-1.

[0168] Table 3-1 Detailed optical data for Example 3

[0169]

[0170]

[0171] The aspherical data in this embodiment are shown in Table 3-2.

[0172] Table 3-2 Aspherical data for Example 3

[0173] surface 32 33 k -9.367E-01 0 A4 1.433E-04 1.626E-04 A6 -1.083E-06 -8.683E-07 A8 4.229E-09 2.372E-09 A10 -1.634E-11 -1.612E-12 A12 4.826E-14 -3.271E-16

[0174] In this embodiment, the values ​​of some lens parameters are as follows.

[0175] Table 3-3 Lens parameters of Example 3

[0176]

[0177]

[0178] In this embodiment, please refer to the MTF curve of the lens under visible light. Figure 13 As can be seen from the figure, when the spatial frequency of this lens reaches 65 l p / mm, the MTF value is around 0.5, indicating excellent image quality and high lens resolution.

[0179] Please refer to the lateral chromatic aberration curve of the lens under visible light. Figure 14 As can be seen from the figure, the lateral color difference is less than 2.5um, indicating a small color difference and high image color reproduction.

[0180] Please refer to the field curvature and distortion diagram of the lens under visible light. Figure 15 As can be seen from the figure, the optical distortion of the system is <|-35%|, which is small and results in high imaging quality.

[0181] Example 4

[0182] like Figure 16 , Figure 17 As shown, the main difference between this embodiment and Embodiment 1 lies in the optical parameters such as the radius of curvature and lens thickness of each lens surface.

[0183] Detailed optical data for this specific embodiment are shown in Table 4-1.

[0184] Table 4-1 Detailed optical data for Example 4

[0185]

[0186]

[0187] The aspherical data in this embodiment are shown in Table 4-2.

[0188] Table 4-2 Aspherical data for Example 4

[0189]

[0190] In this embodiment, the values ​​of some lens parameters are as follows.

[0191] Table 4-3 Lens parameters of Example 4

[0192] type data type data type data fg1 / f 1.52 f 15.2 f10 -11.7 fg2 / f 2.86 f1 -20.2 f11 -13.1 fg3 / f 6.72 f2 31.2 f12 22.1 fg4 / f 5.85 f3 66.8 f13 52.8 f1 / f -1.33 f4 72.9 f14 -28.7 f2 / f 2.06 f5 Infinity f15 38.3 f3 / f 4.40 f6 45.7 f16 39.3 f19 / f -2.60 f7 -48.4 f17 -36.8 f910 / f -2.06 f8 45.4 f18 33.8 f1112 / f -6.95 f9 25.6 f19 -39.5

[0193] In this embodiment, please refer to the MTF curve of the lens under visible light. Figure 18 As can be seen from the figure, when the spatial frequency of this lens reaches 65 lp / mm, the MTF value is greater than 0.5, indicating excellent image quality and high lens resolution.

[0194] Please refer to the lateral chromatic aberration curve of the lens under visible light. Figure 19 As can be seen from the figure, the lateral color difference is less than 2um, indicating a small color difference and high image color reproduction.

[0195] Please refer to the field curvature and distortion diagram of the lens under visible light. Figure 20As can be seen from the figure, the optical distortion of the system is <|-35%|, which is small and results in high imaging quality.

[0196] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A detection lens for VR / AR glasses, characterized in that: It sequentially includes, from the object side to the image side along the optical axis: an aperture stop, a first group, a second group, a third group, and a fourth group, and each of the first group, the second group, the third group, and the fourth group includes at least one lens; The VR / AR glasses detection lens satisfies: 1 < fg1 / f < 2, 2.5 < fg2 / f < 3.2, 6 < fg3 / f < 8, 5 < fg4 / f < 6, where f is the focal length of the VR / AR glasses detection lens, and fg1, fg2, fg3, and fg4 are the focal lengths of the first group, the second group, the third group, and the fourth group respectively; Among them, along the optical axis from the object side to the image side, the first group sequentially includes: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the second group sequentially includes: a sixth lens, a seventh lens, and an eighth lens; the third group sequentially includes: a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens; the fourth group sequentially includes: a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, an eighteenth lens, and a nineteenth lens. The optical elements with optical power in the above VR / AR glasses detection lens are only the above nineteen lenses.

2. The VR / AR glasses detection lens as described in claim 1, characterized in that: The first lens, the second lens, and the third lens are all crescent lenses and satisfy: Nd1 > 1.85, -2 < f1 / f < -1, 1.5 < f2 / f < 2.5, 4 < f3 / f < 6, where Nd1 is the refractive index of the first lens, and f1, f2, and f3 are the focal lengths of the first lens, the second lens, and the third lens respectively.

3. The VR / AR glasses detection lens as described in claim 1, characterized in that: The first lens and the second lens are cemented together, the sixth lens and the seventh lens are cemented together, the fourteenth lens and the fifteenth lens are cemented together, and the seventeenth lens and the eighteenth lens are cemented together, and satisfy: Vd2 - Vd1 > 45, Vd6 - Vd7 > 30, Vd15 - Vd14 > 40, Vd18 - Vd17 > 40, where Vd1, Vd2, Vd6, Vd7, Vd14, Vd15, Vd17, and Vd18 are the Abbe numbers of the first lens, the second lens, the sixth lens, the seventh lens, the fourteenth lens, the fifteenth lens, the seventeenth lens, and the eighteenth lens respectively.

4. The VR / AR glasses detection lens as described in claim 1, characterized in that: The ninth lens and the tenth lens are cemented together, the eleventh lens and the twelfth lens are cemented together, and satisfy: -3 < f910 / f < -1, -8 < f1112 / f < -6, where f91o is the combined focal length of the ninth lens and the tenth lens, and f1112 is the combined focal length of the eleventh lens and the twelfth lens.

5. The VR / AR glasses detection lens as described in claim 1, characterized in that: The nineteenth lens is an aspherical lens and satisfies: -3.5 < f19 / f < -2, where f19 is the focal length of the nineteenth lens.

6. The VR / AR glasses detection lens as described in claim 1, characterized in that: The VR / AR glasses detection lens satisfies: FOV ≤ 120°, where FOV is the field angle of the VR / AR glasses detection lens.

7. A VR / AR glasses detection lens as described in any one of claims 1 to 6, characterized in that: The fifth lens is a prism used to reflect the light from the fourth lens into the sixth lens. The prism includes an incident surface facing the fourth lens, an exit surface facing the sixth lens, and a reflecting surface connecting the incident surface and the exit surface. The angle between the incident surface and the exit surface is a right angle.

8. A VR / AR glasses detection lens as described in any one of claims 1 to 6, characterized in that: The fifth lens is a flat plate lens, including an incident surface facing the fourth lens and into which the imaging light enters, and an exit surface facing the sixth lens and out which the imaging light exits. Both the incident surface and the exit surface are planar.

9. A VR / AR glasses detection lens as described in any one of claims 1 to 6, characterized in that: The first to fourth lenses and the sixth to nineteenth lenses each include an incident surface into which imaging rays enter and an exit surface into which imaging rays exit. The first lens has negative refractive power, and the light-incident surface of the first lens is concave, while the light-outceasing surface is convex. The second lens has positive refractive power, and the light-incident surface of the second lens is concave, while the light-outceasing surface is convex. The third lens has positive refractive power, and the incident surface of the third lens is concave, while the exit surface is convex. The fourth lens has positive refractive power, and the incident surface and the exit surface of the fourth lens are both convex. The sixth lens has positive diopter, and the incident surface and the exit surface of the sixth lens are both convex. The seventh lens has negative refractive power, and the incident surface of the seventh lens is concave, while the exit surface is convex. The eighth lens has positive diopter, and the incident surface of the eighth lens is convex, while the exit surface is either convex or flat. The ninth lens has positive diopter, and the incident surface and the exit surface of the ninth lens are both convex. The tenth lens has negative refractive power, and the incident surface of the tenth lens is concave, and the exit surface of the tenth lens is concave. The eleventh lens has negative refractive power, and the incident surface of the eleventh lens is concave, and the exit surface of the eleventh lens is concave. The twelfth lens has positive refractive power, and the incident surface and the exit surface of the twelfth lens are both convex. The thirteenth lens has positive refractive power, and the incident surface of the thirteenth lens is convex, and the exit surface of the thirteenth lens is convex. The fourteenth lens has negative refractive power, and the incident surface and the exit surface of the fourteenth lens are both concave. The fifteenth lens has positive refractive power, and the incident surface and the exit surface of the fifteenth lens are both convex. The sixteenth lens has positive diopter, and the incident surface and the exit surface of the sixteenth lens are both convex. The seventeenth lens has negative refractive power, and the light-incident surface of the seventeenth lens is convex, while the light-outceasing surface is concave. The eighteenth lens has positive refractive power, and the incident surface of the eighteenth lens is convex, while the exit surface is concave. The nineteenth lens has negative refractive power, and the incident surface of the nineteenth lens is concave, while the exit surface is convex.

Images