Optical lens module and virtual reality device

Abstract

The present disclosure provides an optical lens module and a virtual reality device. In the optical lens module, a display image source is configured to emit circularly polarized light rays propagating along a first light propagation direction; a first lens is configured to propagate the circularly polarized light rays to an entrance surface and an exit surface of a second lens, so as to propagate the circularly polarized light rays to the second lens; the second lens is configured to propagate the circularly polarized light rays to a third lens; the first lens and the second lens are configured to receive the circularly polarized light rays, and adjust a polarization state of the circularly polarized light rays based on an optical composite film layer to form first linearly polarized light propagating along a second propagation direction, and convert the first linearly polarized light into second circularly polarized light, and further convert the second circularly polarized light into second linearly polarized light through folding of an optical path to pass through the exit surface of the third lens, and the second linearly polarized light propagates along the first light propagation direction to form an image, so as to ensure a good imaging effect, while the total optical length is small, and the volume and weight are reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electronic devices, in particular to an optical lens module and a virtual reality device. BACKGROUND

[0002] In virtual reality technology, image information is presented based on an optical lens module, and an electrical signal generated by computer technology is combined with various output devices to make the image information into objects that people can perceive, which can be similar to real objects or virtual objects.

[0003] At present, the existing optical lens module is a Fresnel lens group or a hyperboloid multi-lens group, which has poor imaging effect, large volume and large weight. SUMMARY

[0004] Therefore, the present disclosure provides an optical lens module and a virtual reality device to overcome or alleviate the above problems.

[0005] The technical solution adopted by the present disclosure is as follows:

[0006] An optical lens module comprises a display image source, a first lens, a second lens and a third lens arranged in sequence along a first light propagation direction, wherein:

[0007] The display image source is configured to emit circularly polarized light propagating along the first light propagation direction;

[0008] The first lens has a convex entrance surface and a convex exit surface, and the circularly polarized light is propagated to the entrance surface and the exit surface of the second lens through the entrance surface and the exit surface of the first lens, so as to be propagated to the second lens;

[0009] The second lens has a concave entrance surface and a convex exit surface, so as to propagate the circularly polarized light to the third lens;

[0010] The third lens has a flat entrance surface and a convex exit surface, and an optical composite film layer is arranged on the entrance surface of the third lens. The first linearly polarized light is formed by adjusting the polarization state of the circularly polarized light based on the optical composite film layer, and the first linearly polarized light is converted into second circularly polarized light. The second circularly polarized light is converted into second linearly polarized light through the folding of the optical path to pass through the exit surface of the third lens. The second linearly polarized light propagates along the first light propagation direction to form an image. The second propagation direction is opposite to the first light propagation direction.

[0011] A virtual reality device comprises the optical lens module according to any one of the present disclosure.

[0012] In the technical solution provided by the embodiments of the present disclosure, the first lens and the second lens receive the circularly polarized light, and based on the optical composite film layer, the polarization state of the circularly polarized light is adjusted to form first linearly polarized light propagating along a second propagation direction, and the first linearly polarized light is converted into second circularly polarized light, and the second circularly polarized light is converted into second linearly polarized light to pass through the exit surface of the third lens through the folding of the optical path, so that the polarization state adjustment of the circularly polarized light and the folding of the optical path are realized, the residual aberration is corrected, the resolution of the imaging is higher, the good imaging effect is ensured, the total optical length of the whole optical lens module is smaller, and the volume and weight of the optical lens module are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens module according to an embodiment of the present disclosure;

[0014] Figure 2 FIG. 2 is a schematic diagram of the position change of the first lens L1 in the optical lens module;

[0015] Figure 3 FIG. 3 is a modulation transfer function diagram of application scenario one;

[0016] Figure 4 FIG. 4 is a spot diagram of application scenario one;

[0017] Figure 5 FIG. 5 is a field curvature and distortion curve diagram of application scenario one;

[0018] Figure 6 FIG. 6 is a modulation transfer function diagram of application scenario two;

[0019] Figure 7 FIG. 7 is a spot diagram of application scenario two;

[0020] Figure 8 FIG. 8 is a field curvature and distortion curve diagram of application scenario two;

[0021] Figure 9 FIG. 9 is a modulation transfer function diagram of application scenario three;

[0022] Figure 10 FIG. 10 is a spot diagram of application scenario three;

[0023] Figure 11 FIG. 11 is a field curvature and distortion curve diagram of application scenario three;

[0024] Figure 12 FIG. 12 is a schematic diagram of the position of the human eye and the imaging quality in the above application scenarios of the present disclosure; DETAILED DESCRIPTION

[0025] To make the technical problems, technical solutions and advantages to be solved by this disclosure clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0026] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Figure 1 This is a schematic diagram of the structure of an optical lens module according to an embodiment of the present disclosure; as shown Figure 1 As shown, the optical lens module includes: a display image source IMA, a first lens L1, a second lens L2, and a third lens L3 arranged sequentially along the first light propagation direction, wherein: the display image source IMA is used to emit circularly polarized light propagating along the first light propagation direction; the first lens L1 has a convex incident surface and a convex exit surface, and propagates the circularly polarized light to the incident surface and exit surface of the second lens L2 through its incident and exit surfaces, so as to propagate the circularly polarized light to the second lens L2; ​​the second lens L2 has a concave incident surface and a convex exit surface, so as to propagate the circularly polarized light to the third lens; the third lens L3 has a planar incident surface and a convex exit surface, and an optical composite film layer is disposed on its incident surface, which propagates the circularly polarized light through the first lens, the first lens L1, the second lens L2, and the third lens L3. The second lens receives circularly polarized light and, based on the optical composite film layer, adjusts the polarization state of the circularly polarized light to form first linearly polarized light propagating along the second propagation direction. The first linearly polarized light is then converted into second circularly polarized light. Through optical path folding, the second circularly polarized light is converted into second linearly polarized light to pass through the exit surface of the third lens. The second linearly polarized light propagates along the first light propagation direction to form an image. The second propagation direction is opposite to the first light propagation direction. For example, the first light propagation direction points from the display image source IMA to the third lens L3, while the second light propagation direction points from the third lens L3 to the display image source IMA.

[0028] The optical path from the display image source to the third lens L3 is as follows: Figure 1 As shown, the second linearly polarized light is ultimately formed, propagating along the first light propagation direction and passing through the third lens into the human eye.

[0029] In the embodiment, the circularly polarized light is received by the first lens and the second lens, and the polarization state of the circularly polarized light is adjusted based on the optical composite film layer to form first linearly polarized light propagating along a second propagation direction, and the first linearly polarized light is converted into second circularly polarized light, and the second circularly polarized light is converted into second linearly polarized light to pass through the exit surface of the third lens through folding of the optical path, so that the polarization state adjustment of the circularly polarized light and the folding of the optical path are realized, the residual aberration is corrected, the resolution of imaging is higher, the good imaging effect is ensured, the optical total length of the whole optical lens module is smaller, and the volume and weight of the optical lens module are greatly reduced.

[0030] In the embodiment, the materials of the first lens L1, the second lens L2 and the third lens L3 can be the same or different.

[0031] Further, the focal length f1 of the first lens L1 satisfies 60mm < f1 < 120mm, the focal length f2 of the second lens L2 satisfies -180mm < f2 < -130mm, and the focal length f3 of the third lens L3 satisfies 80mm < f3 < 150mm, so that the first lens L1 has positive refractive power to compress the volume of the circularly polarized light incident on the first lens; in addition, the second lens L2 has negative refractive power, which together with the first lens L1 compresses the optical total length of the optical lens system, ensures that the optical total length of the whole optical lens module is smaller, and makes the volume and weight of the optical lens module smaller, thereby ensuring the thinness of the optical lens module; the negative refractive power of the second lens L2 cooperates with the positive refractive angle of the first lens to correct the residual aberration, realize high resolution of imaging, and ensure good imaging effect. The third lens L3 has positive refractive power, so that the light beam emitted from the third lens can be converged to ensure good imaging effect.

[0032] When the above optical lens module is applied to a wearable interactive device (such as for realizing virtual reality), overall focusing can be realized by adjusting the distance of the display image source IMA relative to each lens; further adjusting the relative position of the first lens L1 relative to the second lens L2 and the third lens L3 realizes internal focusing, which can facilitate myopic people to take off glasses and wear them.

[0033] In addition, since the light entrance surface of the first lens L1 is a convex surface and the light exit surface is a convex surface, a positive focal length can be achieved to compress the circularly polarized light and then propagate to the second lens L2. The light entrance surface of the second lens L2 is a concave surface and the light exit surface is a convex surface, so that the second lens L2 has a negative focal length, so that the compressed circularly polarized light is diffused to the light entrance surface of the third lens L3. The light entrance surface of the third lens L3 is a plane and the light exit surface is a convex surface, so that the third lens L3 has a positive focal length, so that the light beam exiting the third lens is converged. In addition, the optical composite film layer arranged on the light entrance surface of the third lens L3 realizes the polarization state adjustment of the circularly polarized light and the folding of the optical path, and ensures good imaging effect.

[0034] Further, the focal lengths of the lenses of the optical lens module can satisfy the following relationships in addition to the above relationships: the focal length f1 of the first lens L1 satisfies 3F < |f1| < 4F; the focal length f2 of the second lens L2 satisfies 6F < |f2| < 7F; and the focal length f3 of the third lens L3 satisfies 4F < |f3| < 6F, where F represents the system focal length of the optical lens module, so as to realize the thinning of the optical lens module while ensuring good imaging effect.

[0035]

[0036] Optionally, the optical total length TTL of the optical lens module and the system focal length F of the optical lens module satisfy 0.5 ≤ TTL / F ≤ 1.5, so as to reduce the thickness of the optical lens module and the optical total length of the entire optical lens module.

[0037] Optionally, the thickness CT1 of the first lens on the main optical axis and the optical total length TTL of the optical lens module satisfy 0.3 ≤ CT1 / TTL ≤ 0.5, so as to effectively realize the optical path folding while reducing the optical total length of the optical lens module.

[0038] Optionally, the thickness CT2 of the second lens L2 on the main optical axis and the optical total length TTL of the optical lens module satisfy 0.05 ≤ CT2 / TTL ≤ 0.1, so as to reduce the optical path of the optical lens module and diffuse the circularly polarized light exiting the second lens to the third lens L3 at a small angle.

[0039] Optionally, the thickness CT3 of the third lens L3 on the main optical axis and the optical total length TTL of the optical lens module satisfy 0.2 ≤ CT3 / TTL ≤ 0.4, so as to compress the total length of the optical lens module and reduce the thickness of the optical lens module.

[0040] Optionally, the aspheric surface profile curve of any one of the first lens L1, the second lens L2, and the third lens L3 is determined according to the following formula:​

[0041]

[0042] wherein z is the sag, c is the curvature corresponding to the radius of curvature, r is the radial length, K is the conic constant, and a1 to a 10 respectively represent the coefficients corresponding to each radial coordinate on the radius of curvature; when K is less than -1, the surface profile curve of the lens is a hyperbola, when K is equal to -1, the surface profile curve of the lens is a parabola; when K is between -1 and 0, the surface profile curve of the lens is an ellipse, when K is equal to 0, the surface profile curve of the lens is a circle, and when the K coefficient is greater than 0, the surface profile curve of the lens is a flattened circle.

[0043] Based on the above formula for determining the surface profile curve of the aspheric surface, a reasonable aspheric surface can be configured according to the requirements of the application scenario, such as the convex surface or the concave surface described above.

[0044] Optionally, the distance between the exit surface of the third lens L3 and the human eye is not less than 12 mm, and the conical region formed between the exit surface of the third lens L3 and the human eye has a range of not less than 10 mm, so that the display image source processed by the optical lens module can form an optimal imaging position, thereby enhancing the user's experience, and the user can quickly adjust to the optimal imaging position.

[0045] Optionally, the dioptric power coverage of the optical lens module is 0D to -7D, so that the optical lens module has good screen clarity performance and can meet the use requirements of most users.

[0046] Specifically, the adjustment of the dioptric power can be quickly realized by moving the first lens L1.

[0047] Optionally, the field of view FOV of the optical lens module satisfies 90°≤FOV≤105°, so as to reduce the sense of dizziness and improve the sense of immersion.

[0048] Optionally, the refractive indices of the first lens L1, the second lens L2 and the third lens L3 satisfy 3.0≤Nd3+Nd2≤3.4, |Nd3-Nd1|≤0.2, |Nd1-Nd2|≤0.2; Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, and Nd3 is the refractive index of the third lens L3.

[0049] Further, the Abbe numbers of the first lens L1, the second lens L2 and the third lens L3 satisfy 170≤Vd3+Vd2≤90, |Vd3-Vd1|≤10, |Vd1-Vd2|≤40; Vd1 is the Abbe number of the first lens L1, Vd2 is the Abbe number of the second lens L2, and Vd3 is the Abbe number of the third lens L3.

[0050] In an embodiment, the ratio of the propagation speed of light in vacuum to the propagation speed of light in the lens is represented by the refractive index, the Abbe number (also known as the dispersion coefficient) is used to measure the imaging quality of the lens, and in general, the Abbe number is inversely proportional to the refractive index of the lens. The higher the refractive index, the stronger the ability of the incident light to refract. When the refractive index of the lens is larger, the Abbe number is smaller, the dispersion is more obvious, and the imaging quality is poorer. Conversely, the imaging quality is better. Therefore, in the embodiment, by setting the refractive index and Abbe number of each lens, the correction of aberration can be realized, thereby ensuring high resolution of imaging.

[0051] Optionally, in an embodiment, the light entrance surface of the first lens L1 is also coated with a semi-transparent half-reflection film, which cooperates with the optical composite film layer to adjust the polarization state of the circularly polarized light to form the first linearly polarized light propagating along the second propagation direction, and convert the first linearly polarized light into the second circularly polarized light, and then fold the optical path by converting the second circularly polarized light into the second linearly polarized light.

[0052] Optionally, the optical composite film layer includes a first film layer, a second film layer, a third film layer and a fourth film layer arranged in sequence along the first light propagation direction, the first film layer is used for anti-reflection treatment of the circularly polarized light to avoid a large amount of reflection of the circularly polarized light, effectively improving the overall transmittance of the system and increasing the image contrast. The second film layer is used for adjusting the polarization state of the circularly polarized light to generate the first linearly polarized light, the vibration direction of the first linearly polarized light is perpendicular to the transmission axis direction of the third film layer, so that the third film layer is used for reflecting the first linearly polarized light so that the first linearly polarized light is processed by the second film layer again to realize the adjustment of the polarization state to generate the second circularly polarized light, and then sequentially enter the second lens L2 and the first lens L1, and then be reflected by the semi-transparent half-reflection film coated on the light entrance surface of the first lens L1 to complete the folding of the optical path, and then be emitted from the light exit surface of the first lens L1 and enter the second lens L2, and then be processed by the first film layer and the second film layer of the light entrance surface of the third lens L3 in sequence, so that the second circularly polarized light is converted into the second linearly polarized light, the vibration direction of the second linearly polarized light is consistent with the transmission axis direction of the third film layer, so that the second linearly polarized light passes through the light exit surface of the third lens L3, and the fourth film layer is used for reinforcing the light leakage of the third film layer without changing the above-mentioned polarization state. The second linearly polarized light propagates along the first light propagation direction to form an image, and the second propagation direction is opposite to the first light propagation direction.

[0053] The specific implementation of the first film layer, the second film layer, the third film layer and the fourth film layer can be determined according to the requirements of the application scene.

[0054] Based on the above description of the embodiments of the present disclosure, the configurations of the various lenses are exemplarily described as follows in combination with the requirements of specific application scenarios.

[0055] Application scenario (one): f1 = 79.53 mm, f2 = -155.32 mm, f3 = 109.08 mm, TTL = 19.72 mm.

[0056] Table 1

[0057]

[0058] Table 1 is a configuration detail of each lens, Nd is the refractive index, Vd is the Abbe number, surface numbers S1, S3 and S5 are the exit surfaces of the third lens L3, the second lens L2 and the first lens L1 in sequence, and surface numbers S2, S4 and S6 are the entrance surfaces of the third lens L3, the second lens L2 and the first lens L1 in sequence.

[0059] Table 2

[0060] Surface number K [alpha]4 [alpha]6 [alpha]8 10 ]]> ​ S1 -4.26E+01 2.92E-05 -8.33E-08 2.57E-10 -5.50E-13 S2 0 0 0 0 0 S3 -1.99E+02 6.68E-06 -3.96E-08 4.63E-11 1.65E-13 S4 1.83E+01 4.82E-06 -4.02E-08 5.50E-11 9.39E-14 S5 3.45E+00 7.79E-06 -9.11E-10 -1.31E-10 2.94E-13 S6 8.02E+00 4.83E-06 6.05E-09 -2.31E-11 1.22E-14

[0061] Table 2 is a parameter diagram of each lens, including the aspherical surface parameters of each lens, the conic quadratic curve coefficients of the lens, and the corresponding relationship of the coefficients corresponding to each radial coordinate of the radius of curvature.

[0062] Table 3

[0063]

[0064] Table 3 is the diopter of the first lens L1 at different positions, and the position change diagram of the first lens L1 in the optical lens module is as shown in Figure 2

[0065] Figure 3 As shown in Figure 3 , the abscissa represents the spatial frequency in cycles per mm, and the ordinate represents the modulation transfer function (MTF) value. In order to preliminarily verify the effect of the scheme of the present disclosure, the following six kinds of image source parameters are configured to determine the modulation transfer function value.

[0066] In the six kinds of image source parameters, each image source parameter includes the image height of the display image source, whether the imaging quality is the tangential imaging quality or the sagittal imaging quality, and the specific information is as follows:

[0067] ​(1) Image height of 0.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0068] (2) Image height of 0.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0069] (3) Image height of 8.58 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF4;

[0070] (4) Image height of 8.58 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF3;

[0071] (5) Image height of 17.25 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF2;

[0072] (6) Image height of 17.25 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF1;

[0073] See Figure 3 As shown, all modulation transfer function values ​​are greater than the threshold value of 0.4 for a better resolution, thus exhibiting good resolution.

[0074] The above Figure 3 The specific image source parameters selected are merely examples and are not unique limitations.

[0075] Figure 4 For the diffusion pattern in application scenario three; by Figure 4 As can be seen, the image source parameters of the displayed image source are denoted as (center field of view, image height). In this embodiment, the image source parameters of 8 sets of displayed image sources are used as an example to illustrate the technical effects of the present disclosure embodiment from the perspective of field of view diffusion spots. The image source parameters of the 8 display image sources are denoted as IMA(0.000, 0.000mm), IMA(0.000, 1.715mm), IMA(0.000, 3.430mm), IMA(0.000, 5.146mm), IMA(0.000, 6.861mm), IMA(0.000, 8.576mm), IMA(0.000, 10.291mm), IMA(0.000, 12.006mm), IMA(0.000, 13.722mm), IMA(0.000, 15.437mm), and IMA(0.000, 17.250mm).

[0076] like Figure 4As shown, the size of the blur spot is on the vertical axis. It can be seen that under the image source parameters of the 8 sets of display image sources, the size of the blur spot is smaller than the blur spot size threshold (e.g., 50um) when the matching image quality is good. Therefore, the image quality is good.

[0077] Figure 5 This is a graph showing the field curvature and distortion curves for application scenario one. For example... Figure 5 As shown, for field curvature, the vertical axis represents the field size, and the horizontal axis represents the field curvature size, with the unit being millimeters. For distortion, the horizontal axis represents the distortion size (expressed as a percentage), where S represents the field curvature in the sagittal direction and T represents the field curvature in the meridional direction. Figure 5 As shown, the field curvature across the entire field of view is less than the field curvature threshold, for example, 0.5 mm. See also... Figure 5 Since the distortion value is located to the left of 0, there is no distortion inversion. Therefore, this indicates that the field curvature correction of the scheme in the embodiments of this disclosure is good, and the distortion exhibits a linear change.

[0078] Application Scenario (II): f1 = 85.67mm, f2 = -167.45mm, f3 = 122.17mm, TTL = 18.92mm.

[0079] Table 4

[0080]

[0081] Table 4 shows the configuration details of each lens. Nd is the refractive index, Vd is the Abbe number, and the surface numbers S1, S3, and S5 are the exit surfaces of the third lens L3, the second lens L2, and the first lens L1, respectively. The surface numbers S2, S4, and S6 are the incident surfaces of the third lens L3, the second lens L2, and the first lens L1, respectively.

[0082] Table 5

[0083] Surface number K [alpha]4 [alpha]6 [alpha]8 10 ]]> ​ S1 -9.74E+01 2.14E-05 -7.76E-08 3.05E-10 -6.32E-13 S2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 1.99E+02 7.17E-06 -3.91E-08 7.08E-11 1.09E-13 S4 2.46E+01 7.15E-06 -4.39E-08 8.18E-11 9.70E-14 S5 1.30E+01 6.38E-06 8.81E-09 -1.38E-10 2.74E-13 S6 8.07E+00 3.37E-06 9.21E-09 -2.63E-11 8.70E-15

[0084] Table 5 shows the parameters of each lens, including the aspherical parameters of each lens, the conic quadratic coefficient of the lens, and the corresponding coefficients of each radial coordinate on the radius of curvature.

[0085] Table 6

[0086]

[0087] Table 6 shows the refractive power of the first lens L1 at different positions.

[0088] Figure 6 The modulation transfer function diagram for application scenario two is shown below;Figure 6 As shown in the figure, the abscissa represents the spatial frequency in cycles per mm, and the ordinate represents the modulation transfer function (MTF) value. In order to preliminarily verify the effect of the scheme of the present disclosure, the following six kinds of image source parameters are configured to determine the modulation transfer function value.

[0089] Among the six kinds of image source parameters, each image source parameter includes the image height of the display image source, and the imaging quality is the tangential imaging quality or the sagittal imaging quality, as follows:

[0090] (1) The image height is 8.58 mm, and the tangential imaging quality, and the corresponding modulation transfer function is marked as MTF5;

[0091] (2) The image height is 17.25 mm, and the tangential imaging quality, and the corresponding modulation transfer function is marked as MTF4;

[0092] (3) The image height is 17.25 mm, and the sagittal imaging quality, and the corresponding modulation transfer function is marked as MTF3;

[0093] (4) The image height is 0.00 mm, and the tangential imaging quality, and the corresponding modulation transfer function is marked as MTF2;

[0094] (5) The image height is 0.00 mm, and the sagittal imaging quality, and the corresponding modulation transfer function is marked as MTF2;

[0095] (6) The image height is 8.58 mm, and the sagittal imaging quality, and the corresponding modulation transfer function is marked as MTF1;

[0096] Referring to Figure 6 As shown in the figure, the values of all the modulation transfer functions are greater than the modulation transfer function value threshold 0.4 matching the good resolution, and therefore, the resolution is good.

[0097] The specific image source parameters selected in the above Figure 6 are only examples and are not unique limitations.

[0098] Figure 7 The diffraction spot diagram for the second application scenario; from Figure 7It can be seen that the image source parameters of the display image source are recorded as (central field of view, image height), and in this embodiment, the image source parameters of 8 display image sources are taken as an example to illustrate the technical effects of the embodiments of the present disclosure from the perspective of field of view dispersion spot. The image source parameters of the 8 display image sources are recorded as IMA(0.000, 0.000 mm), IMA(0.000, 1.915 mm), IMA(0.000, 3.830 mm), IMA(0.000, 5.745 mm), IMA(0.000, 7.660 mm), IMA(0.000, 9.575 mm), IMA(0.000, 11.490 mm), IMA(0.000, 13.405 mm), IMA(0.000, 15.320 mm), IMA(0.000, 17.235 mm), and IMA(0.000, 19.150 mm).

[0099] As shown in Figure 7 , the size of the dispersion spot is the ordinate, and it can be seen that, under the image source parameters of the 8 display image sources, the size of the dispersion spot is less than the dispersion spot size threshold (for example, 50 um) when the matching imaging quality is better, and therefore the imaging quality is good. Figure 8 The field curvature and distortion curves for application scenario two are shown in Figure 8 , for the field curvature (also referred to as Field Curvature), the ordinate is the field of view size, and the abscissa represents the field curvature size, which is in millimeters (Millimeters); for the distortion (also referred to as F-Tan(Theta) Distortion), the abscissa represents the distortion size (expressed in percentage Percent), S represents the sagittal direction field curvature, and T represents the tangential direction field curvature. As shown in Figure 8 , the full field of view field curvature is less than the full field of view field curvature threshold, for example, 0.5 mm. Referring back to Figure 8 , since the distortion value is located to the left of 0, the distortion is not curved. Therefore, it is shown that the scheme of the embodiments of the present disclosure is good in field curvature correction, and the distortion presents linear change.

[0100] Application scenario (three): f1=85.66 mm, f2=-159.45 mm, f3=102.76 mm, TTL=19.98 mm.

[0101] Table 7

[0102]

[0103] Table 7 is the configuration details of each lens, Nd is the refractive index, Vd is the Abbe number, face numbers S1, S3, and S5 are the exit surfaces of the third lens L3, the second lens L2, and the first lens L1 in sequence, and face numbers S2, S4, and S6 are the entrance surfaces of the third lens L3, the second lens L2, and the first lens L1 in sequence.

[0104] Table 8

[0105]

[0106] Table 8 shows the parameters of each lens, including the aspherical parameters of each lens, the conic quadratic coefficient of the lens, and the corresponding coefficients of each radial coordinate on the radius of curvature.

[0107] Table 9

[0108]

[0109] Table 9 shows the refractive power of the first lens L1 at different positions.

[0110] Figure 9 The modulation transfer function diagram for application scenario three is shown below; Figure 9 As shown, the horizontal axis represents the number of line pairs per millimeter (spatial frequency in cycles per mm) on the imaging surface, and the vertical axis represents the modulation transfer function (MTF) value. To initially verify the effectiveness of the disclosed scheme, the following six image source parameters were configured to determine the MTF value.

[0111] Among the six image source parameters, each image source parameter includes the image height of the displayed image source and whether the imaging quality is meridional or sagittal, as detailed below:

[0112] (1) Image height of 8.58 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0113] (2) Image height of 0.00 mm, meridional ray (Tangential) imaging quality, the corresponding modulation transfer function is labeled MTF4;

[0114] (3) Image height of 0.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF4;

[0115] (4) Image height of 8.58 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF3;

[0116] (5) Image height of 17.25 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF2;

[0117] (6) Image height of 17.25 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF1;

[0118] See Figure 9 As shown, the values ​​of all modulation transfer functions are greater than the threshold value of 0.4 for a better-matched modulation transfer function, thus exhibiting good resolution.

[0119] The above Figure 9 The specific image source parameters selected are merely examples and are not unique limitations.

[0120] Figure 10 This is the diffusion pattern for application scenario two; by Figure 10 As can be seen, the image source parameters of the displayed image source are denoted as (center field of view, image height). In this embodiment, the image source parameters of 8 sets of displayed image sources are used as an example to illustrate the technical effects of the present disclosure embodiment from the perspective of field of view diffusion spots. The image source parameters of the 8 display image sources are denoted as IMA(0.000, 0.000mm), IMA(0.000, 1.715mm), IMA(0.000, 3.430mm), IMA(0.000, 5.146mm), IMA(0.000, 6.861mm), IMA(0.000, 8.576mm), IMA(0.000, 10.291mm), IMA(0.000, 12.006mm), IMA(0.000, 13.722mm), IMA(0.000, 15.437mm), and IMA(0.000, 17.250mm).

[0121] like Figure 10 As shown, the size of the blur spot is on the vertical axis. It can be seen that under the image source parameters of the 8 sets of display image sources, the size of the blur spot is smaller than the blur spot size threshold (e.g., 50um) when the matching image quality is good. Therefore, the image quality is good.

[0122] Figure 11 This is a graph showing the field curvature and distortion curves for application scenario two. For example... Figure 11 As shown, for field curvature, the vertical axis represents the field size, and the horizontal axis represents the field curvature size, with the unit being millimeters. For distortion, the horizontal axis represents the distortion size (expressed as a percentage), where S represents the field curvature in the sagittal direction and T represents the field curvature in the meridional direction. Figure 11 As shown, the field curvature across the entire field of view is less than the field curvature threshold, for example, 0.5 mm. See also... Figure 11In the figure, since the distortion value is located on the left side of 0, the distortion has no inflection. Therefore, it is shown that the scheme of the embodiment of the present disclosure corrects the field curvature well, and the distortion presents linear change.

[0123] Figure 9 The figure is a schematic diagram of the position of the human eye and the imaging quality in the application scenario of the present disclosure. The planes where positions A, C, D, E and F are located are parallel to the image plane. As shown in the figure, since position B is located on the main optical axis of the optical lens module, the aberration is relatively small, while the human eye is located at positions A, C, D, E and F, which are not on the main optical axis, so that the imaging quality is best when the human eye is located at position B, while there is a large residual aberration at other positions, resulting in poor imaging quality. Figure 9

[0124] The embodiment of the present disclosure also provides a virtual reality device, including but not limited to a VR all-in-one machine, a VR head-mounted display, a VR glasses and the like, which includes the optical lens module according to any one of the embodiments of the present disclosure.

[0125] The embodiment of the present disclosure can also provide an interactive system, which includes the virtual reality device provided by the embodiment of the present disclosure.

[0126] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0127] In addition, the technical features involved in the different embodiments of the present disclosure described below can be combined with each other as long as there is no conflict.

[0128] The above-described embodiments are merely specific embodiments of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than limit the same. The protection scope of the present disclosure is not limited thereto, and although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any skilled person in the art can make modifications or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some of the technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be covered in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.​

Claims

1. An optical lens module, characterized in that, The optical lens module consists of a display image source, a first lens, a second lens, and a third lens arranged sequentially along the first light propagation direction, wherein: The display image source is used to emit circularly polarized light that propagates along the direction of the first light beam; The first lens has a convex incident surface and a convex exit surface. The circularly polarized light is propagated to the second lens through its incident and exit surfaces. The second lens has a concave incident surface and an exit surface with a radius of curvature of -5.27E+3, so as to propagate the circularly polarized light to the third lens; The third lens has a planar incident surface and a convex exit surface. An optical composite film is provided on its incident surface. The circularly polarized light is received by the first lens and the second lens. Based on the optical composite film, the polarization state of the circularly polarized light is adjusted to form a first linearly polarized light that propagates along the second propagation direction. The first linearly polarized light is then converted into a second circularly polarized light. Through optical path folding, the second circularly polarized light is converted into a second linearly polarized light to pass through the exit surface of the third lens. The second linearly polarized light propagates along the first light propagation direction to form an image. The second propagation direction is opposite to the first light propagation direction.

2. The optical lens module according to claim 1, characterized in that, The focal length f1 of the first lens satisfies: 60mm < f1 < 120mm, the focal length f2 of the second lens satisfies: -180mm < f2 < -130mm, and the focal length f3 of the third lens satisfies: 80mm < f3 < 150mm.

3. The optical lens module according to claim 1, characterized in that, The focal lengths f1 of the first lens, f2 of the second lens, and f3 of the third lens are f1 = 79.53 mm, f2 = -155.32 mm, and f3 = 109.08 mm, respectively.

4. The optical lens module according to claim 1, characterized in that, The aspherical surface profile of any one of the first, second, and third lenses is determined according to the following formula: Where z is the sag, c is the curvature corresponding to the radius of curvature, r is the radial length, K is the conic conic coefficient, and α1 to α 10 These represent the coefficients corresponding to each radial coordinate on the radius of curvature. When K is less than -1, the surface profile of the lens is a hyperbola; when K equals -1, the surface profile of the lens is a parabola; when K is between -1 and 0, the surface profile of the lens is an ellipse; when K equals 0, the surface profile of the lens is a circle; and when the coefficient K is greater than 0, the surface profile of the lens is an oval.

5. The optical lens module according to claim 1, characterized in that, The distance between the exit surface of the third lens and the human eye is not less than 12mm, and the range of the cone-shaped area formed between the exit surface of the third lens and the human eye is not less than 10mm.

6. The optical lens module according to claim 1, characterized in that, The refractive indices of the first lens, the second lens, and the third lens satisfy the following: 3.0≤Nd3+Nd2≤3.4, ||Nd3-Nd1|≤0.2, |Nd1-Nd2|≤0.2; where Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, and Nd3 is the refractive index of the third lens.

7. The optical lens module according to claim 6, characterized in that, The Abbe numbers of the first lens, the second lens, and the third lens satisfy: 70≤Vd3+Vd2≤90, |Vd3-Vd1|≤10, |Vd1-Vd2|≤40; where Vd1 is the Abbe number of the first lens, Vd2 is the Abbe number of the second lens, and Vd3 is the Abbe number of the third lens.

8. The optical lens module according to claim 1, characterized in that, The focal length f1 of the first lens L1 satisfies: 3F < |f1| < 4F, where F represents the system focal length of the optical lens module.

9. The optical lens module according to claim 1, characterized in that, The focal length f2 of the second lens L2 satisfies: 6F < |f2| < 7F, where F represents the system focal length of the optical lens module.

10. The optical lens module according to claim 1, characterized in that, The focal length f3 of the third lens L3 satisfies: 4F < |f3| < 6F, where F represents the system focal length of the optical lens module.

11. The optical lens module according to claim 1, characterized in that, The total optical length (TTL) of the optical lens module and the system focal length (F) of the optical lens module satisfy the following condition: 0.5 ≤ TTL / F ≤ 1.

5.

12. The optical lens module according to claim 1, characterized in that, The thickness CT1 of the first lens on the main optical axis and the total optical length TTL of the optical lens module satisfy: 0.3≤CT1 / TTL≤0.

5.

13. The optical lens module according to claim 1, characterized in that, The thickness CT2 of the second lens L2 on the main optical axis and the total optical length TTL of the optical lens module satisfy the following condition: 0.05≤CT2 / TTL≤0.

1.

14. The optical lens module according to claim 1, characterized in that, The thickness CT3 of the third lens L3 on the main optical axis and the total optical length TTL of the optical lens module satisfy the following condition: 0.2≤CT3 / TTL≤0.

4.

15. A virtual reality device, characterized in that, It includes the optical lens module as described in any one of claims 1-14.

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