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 emits circularly polarized light rays propagating along a first light propagation direction; a first lens propagates the circularly polarized light rays to an incident surface and an exit surface of a second lens to propagate the circularly polarized light rays to the second lens; the second lens receives the circularly polarized light rays through the first lens, adjusts 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 opposite to the first light propagation direction, converts the first linearly polarized light into second circularly polarized light, and converts the second circularly polarized light into second linearly polarized light through folding of an optical path. A third lens propagates the second linearly polarized light along the first light propagation direction to form an image, ensures a good imaging effect, and reduces an overall optical length, volume and weight.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electronic devices, and 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 convert the image information into objects that can be perceived by people, 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 the disadvantages of poor edge imaging clarity, relatively small field of view, and large volume and 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 concave 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 propagate the circularly polarized light to the second lens;

[0009] The second lens has a convex entrance surface and a flat exit surface, and an optical composite film layer is arranged on the exit surface, 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, and the second circularly polarized light is converted into second linearly polarized light through the folding of the optical path, and the second propagation direction is opposite to the first light propagation direction;

[0010] The third lens has a convex entrance surface and a concave or flat exit surface, and the second linearly polarized light is propagated along the first light propagation direction for imaging.

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

[0012] In the technical scheme provided by the embodiments of the present disclosure, the first lens is used to propagate the circularly polarized light to the second lens; the second lens is provided with an optical composite film layer on the exit surface thereof, 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 then the second circularly polarized light is converted into second linearly polarized light through folding of an optical path, and then the second linearly polarized light is propagated along the first light propagation direction through the third lens to perform imaging, 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 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 position change of a first lens L1 in the optical lens module;

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

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

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

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

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

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

[0021] Figure 9 FIG. 9 is a schematic diagram of human eye position and imaging quality in the above-mentioned application scenarios of the present disclosure. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical schemes and advantages to be solved by the present disclosure more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0023] 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.

[0024] 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 concave exit surface, and propagates the circularly polarized light to the incident and exit surfaces of the second lens L2 through its incident and exit surfaces; the second lens L2 has a convex incident surface and a planar exit surface, and an optical composite film layer is disposed on its exit surface, which receives the circularly polarized light through the first lens L1, 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 the second propagation direction, and the first linearly polarized light is converted into second circularly polarized light. Then, through optical path folding, the second circularly polarized light is converted into second linearly polarized light. The second propagation direction is opposite to the first light propagation direction. For example, the first light propagation direction is along the display image source IMA pointing to the third lens L3, while the second light propagation direction is along the third lens L3 pointing to the display image source IMA. The light-incident surface of the third lens L3 is convex, and the light-exit surface is concave or flat, so as to propagate the second linearly polarized light along the first light propagation direction for imaging.

[0025] 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.

[0026] Figure 1In the embodiment, the circularly polarized light is transmitted to the second lens L2 through the first lens L1; an optical composite film layer is arranged on an exit surface of the second lens L2, and the polarization state of the circularly polarized light is adjusted based on the optical composite film layer to form first linearly polarized light transmitted 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 through folding of an optical path, and the second linearly polarized light is transmitted along the first light propagation direction through the third lens L3 to form an image, 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 image is higher, the good imaging effect is ensured, the total optical length of the optical lens module is smaller, and the volume and weight of the optical lens module are greatly reduced.

[0027] 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.

[0028] Further, the focal length f1 of the first lens L1 satisfies -100mm < f1 < -60mm, the focal length f2 of the second lens L2 satisfies 60mm < f2 < 100mm, and the focal length f3 of the third lens L3 satisfies 20mm < f3 < 60mm, so that the first lens L1 has negative optical power, and the second lens L2 has positive optical power, the light is reflected twice, and the total optical length of the optical lens module is small, the residual aberration is corrected to realize high resolution of the image, the volume and weight of the optical lens module are small, and the thinness of the optical lens module is ensured; in addition, since the third lens L3 has positive optical power, the light beam emitted from the third lens can be converged. Therefore, the focal length f1 of the first lens L1 satisfies -100mm < f1 < -60mm, the focal length f2 of the second lens L2 satisfies 60mm < f2 < 100mm, and the focal length f3 of the third lens L3 satisfies 20mm < f3 < 60mm, which can ensure the thinness of the optical lens module while realizing good imaging effect.

[0029] When the above optical lens module is applied to a virtual reality device, the 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.

[0030] In addition, since the light entrance surface of the first lens L1 is convex and the light exit surface is concave, a negative focal length can be achieved, thereby slightly diverging the circularly polarized light to the second lens L2. The light entrance surface of the second lens L2 is convex and the light exit surface is flat, thereby adjusting the polarization state of the circularly polarized light and folding the optical path. The light entrance surface of the third lens L3 is convex and the light exit surface is concave or flat, thereby achieving a large positive focal length for converging the exit light beam to propagate the second linearly polarized light for imaging.

[0031] 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 2F<|f1|<4F; the focal length f2 of the second lens L2 satisfies 2F<|f2|<4F; and the focal length f3 of the third lens L3 satisfies 1F<|f3|<2F, where F represents the system focal length of the optical lens module, thereby achieving thinning of the optical lens module while ensuring good imaging effects.

[0032] 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, thereby reducing the thickness of the optical lens module and the optical total length of the entire optical lens module.

[0033] Optionally, the thickness CT1 of the first lens L1 on the main optical axis and the optical total length TTL of the optical lens module satisfy 0.05≤CT1 / TTL≤0.3, thereby slightly diverging the light beam to the second lens while reducing the optical path of the optical module.

[0034] 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 0.2≤CT2 / TTL≤0.4, thereby effectively ensuring the implementation of the folded optical path while reducing the optical total length of the entire optical lens module.

[0035] 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, thereby achieving compression transmission of the light beam, reducing the optical path, and ensuring good imaging effects.

[0036] Optionally, the aspheric surface profile of any one of the first lens L1, the second lens L2, and the third lens L3 is determined according to the following formula:

[0037]

[0038] wherein z is the sag, c is the curvature corresponding to the curvature radius, r is the radial length, K is the conic quadratic coefficient, and α1 to α5 are the coefficients of the aspheric surface profile.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.

[0039] Based on the formula for determining the surface curve of an aspherical surface, a suitable aspherical surface, such as the convex or concave surface mentioned above, can be configured according to the needs of the application scenario.

[0040] Optionally, the distance between the exit surface of the third lens L3 and the human eye is not less than 12mm, and the range of the conical area formed between the exit surface of the third lens L3 and the human eye is not less than 8mm. This facilitates the display image source to form the optimal imaging position after being processed by the optical lens module, thereby enhancing the user experience and allowing the user to quickly adjust to the optimal imaging position.

[0041] Optionally, the optical lens module has a refractive power range of 0D to -7D, thereby ensuring that the optical lens module has good screen clarity performance and can meet the needs of most users.

[0042] In one alternative implementation, the diopter can be quickly adjusted by moving the third lens L3.

[0043] Optionally, the field of view (FOV) of the optical lens module satisfies: 90°≤FOV≤105°, thereby reducing dizziness and improving immersion.

[0044] Optionally, the refractive indices of the first lens L1, the second lens L2, and the third lens L3 satisfy: 2.8≤Nd3+Nd2≤3.4, |Nd3-Nd1|≤0.3, and |Nd1-Nd2|≤0.3; where 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.

[0045] Furthermore, the Abbe numbers of the first lens L1, the second lens L2, and the third lens L3 satisfy: 100≤Vd3+Vd2≤120, |Vd3-Vd1|≤35, |Vd1-Vd2|≤40; where 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.

[0046] 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 this 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.

[0047] 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 first linearly polarized light propagating along the second propagation direction, and to convert the first linearly polarized light into second circularly polarized light, and then fold the optical path by reflecting the second circularly polarized light through the semi-transparent half-reflection film coated on the light entrance surface of the first lens L1.

[0048] 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 first linearly polarized light propagating along the second propagation direction. The propagation 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 again by the second film layer to adjust the polarization state to generate second circularly polarized light, which is incident into the first lens L1 and 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 emitted from the exit surface of the first lens L1 and incident into the second lens L2. The second circularly polarized light is converted into second linearly polarized light by the first film layer and the second film layer on the exit surface of the second lens L2 in sequence, so that the second linearly polarized light propagates to the third lens L3 through the third film layer and passes through the third lens L3. The fourth film layer is used to reinforce the light leakage of the third film layer without changing the above-mentioned polarization state.

[0049] 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 scenario.

[0050] Based on the above description of the embodiments of the present disclosure, the configuration of each lens is exemplarily illustrated as follows in combination with the requirements of specific application scenarios.

[0051] Application scenario (one): f1=-68.35mm, f2=79.54mm, f3=31.83mm, TTL=22.3mm.

[0052] Table 1

[0053]

[0054] Table 1 is a configuration detail of each lens, Nd is the refractive index, Vd is the Abbe number, face numbers S1, S3, S5 are the exit surfaces of the third lens L3, the second lens L2 and the first lens L1 in turn, and face numbers S2, S4, S6 are the entrance surfaces of the third lens L3, the second lens L2 and the first lens L1 in turn.

[0055] Table 2

[0056] Surface number K [alpha]4 [alpha]6 [alpha]8 10 ]]> ​ S1 -3.92E+01 -5.02E-05 6.62E-07 5.45E-11 -3.09E-11 S2 -8.86E-01 -4.21E-06 -1.04E-07 3.47E-09 -1.55E-11 S3 0 0 0 0 0 S4 -2.51E+01 2.97E-05 -7.20E-08 5.88E-12 8.93E-14 S5 -2.51E+01 -3.79E-06 -6.03E-09 -1.02E-11 1.45E-14 S6 4.33E+00 -9.38E-06 7.65E-09 1.38E-11 -2.94E-14

[0057] 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.

[0058] Table 3

[0059]

[0060] 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 .

[0061] Figure 3 is the modulation transfer function diagram of application scenario one; as shown in Figure 3 , the abscissa represents the spatial frequency in cycles per mm, and the ordinate represents the modulation transfer function (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.

[0062] 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 (Tangential) imaging quality or the sagittal (Sagittal) imaging quality, and the specific contents are as follows:

[0063] (1) The image height is 0.00mm, the tangential (Tangential) imaging quality, and the corresponding modulation transfer function is marked as MTF2;

[0064] (2) the image height is 0.00 mm, and the sagittal imaging quality corresponds to a modulation transfer function marked as MTF2;

[0065] (3) the image height is 19.15 mm, and the tangential imaging quality corresponds to a modulation transfer function marked as MTF1;

[0066] (4) the image height is 9.57 mm, and the tangential imaging quality corresponds to a modulation transfer function marked as MTF3;

[0067] (5) the image height is 19.15 mm, and the sagittal imaging quality corresponds to a modulation transfer function marked as MTF4;

[0068] (6) the image height is 9.57 mm, and the sagittal imaging quality corresponds to a modulation transfer function marked as MTF5;

[0069] Referring to Figure 3 It can be seen that the values of all the modulation transfer functions are greater than the modulation transfer function value threshold 0.4 that matches the better resolution, and therefore, the resolution is better.

[0070] The specific image source parameters selected in the above Figure 3 are merely examples and are not unique limitations.

[0071] Figure 4 is a dispersion spot diagram of the application scenario three; and Figure 4 It 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 the 8 groups of display image sources are taken as examples to explain the technical effects of the embodiments of the present disclosure from the field of view dispersion spot. The image source parameters of the 8 groups of 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).

[0072] As Figure 4 shown, the size of the dispersion spot is the ordinate, and it can be seen that under the image source parameters of the 8 groups of display image sources, the size of the dispersion spot is less than the dispersion spot size threshold (such as 50 um) that matches the better imaging quality, and therefore, the imaging quality is good.

[0073] 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 ordinate represents the field size, and the abscissa represents the field curvature size, with the unit being millimeters (Millimeters); for distortion (also known as F-Tan (Theta) Distortion), the abscissa 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.

[0074] Application Scenario (II): f1 = -65.76mm, f2 = 69.89mm, f3 = 34.03mm, TTL = 21.8mm.

[0075] Table 4

[0076]

[0077] 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.

[0078] Table 5

[0079] Surface number K [alpha]4 [alpha]6 [alpha]8 10 ]]> ​ S1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 -1.33E+00 2.07E-05 -2.54E-07 1.99E-09 -1.13E-11 S3 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 -2.91E+00 2.96E-05 -7.53E-08 -5.27E-12 9.35E-14 S5 -1.84E+01 -1.18E-05 -6.71E-10 -2.69E-12 2.39E-14 S6 -8.95E+01 -9.65E-06 9.92E-09 1.54E-11 -2.89E-14

[0080] 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.

[0081] Table 6

[0082]

[0083] Table 6 shows the refractive power of the first lens L1 at different positions.

[0084] Figure 6 The modulation transfer function diagram for application scenario two is shown below; Figure 6As shown in the figure, the abscissa represents the line pairs per millimeter on the imaging plane, and the ordinate represents the modulation transfer function value. In order to preliminarily verify the effect of the scheme of the present disclosure, the modulation transfer function (MTF) value is determined by configuring the following six kinds of image source parameters.

[0085] Each of the six image source parameters includes the image height of the image source, whether the imaging quality is tangential imaging quality or sagittal imaging quality, and the specific contents are as follows:

[0086] (1) The image height is 0.00 mm, and the tangential imaging quality, and the corresponding modulation transfer function is marked as MTF1;

[0087] (2) The image height is 0.00 mm, and the sagittal imaging quality, and the corresponding modulation transfer function is marked as MTF1;

[0088] (3) The image height is 19.15 mm, and the tangential imaging quality, and the corresponding modulation transfer function is marked as MTF3;

[0089] (4) The image height is 9.57 mm, and the tangential imaging quality, and the corresponding modulation transfer function is marked as MTF2;

[0090] (5) The image height is 19.15 mm, and the sagittal imaging quality, and the corresponding modulation transfer function is marked as MTF5;

[0091] (6) The image height is 9.57 mm, and the sagittal imaging quality, and the corresponding modulation transfer function is marked as MTF4;

[0092] Referring to Figure 6 As shown in the figure, the values of all modulation transfer functions are greater than the modulation transfer function value threshold 0.4 that matches the better resolution, and therefore, the resolution is better.

[0093] The specific image source parameters selected in the above Figure 6 are only examples and are not the only limitation.

[0094] Figure 7 The diffraction spot diagram of 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 groups of display image sources are taken as examples to illustrate the technical effects of the embodiments of the present disclosure from the field of view dispersion spot angle. The image source parameters of the 8 groups of 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).

[0095] Figure 8 The figure is a field curvature and distortion curve diagram for the application scenario two. As shown in Figure 8 , for the field curvature (also known as Field Curvature), the vertical coordinate is the field of view size, and the horizontal coordinate represents the field curvature size, which is in millimeters (Millimeters); for the distortion (also known as F-Tan(Theta) Distortion), the horizontal coordinate 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 5 , all the field curvatures are less than the full field curvature threshold such as 0.5 mm. Referring again to Figure 5 , since the distortion value is located to the left of 0, the distortion has no inflection. Therefore, it is shown that the scheme of the embodiments of the present disclosure has good field curvature correction, and the distortion presents linear change.

[0096] Figure 9 The figure is a schematic diagram of the position of the human eye and the imaging quality in the above application scenarios of the present disclosure; the planes where positions A, C, D, E, and F are located are parallel to the image surface. As shown in Figure 9 , 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, therefore, 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.

[0097] The embodiments of the present disclosure also provide a virtual reality device, including but not limited to a VR all-in-one machine, a VR head-mounted device, and the like, which includes the optical lens module according to any one of the embodiments of the present disclosure.

[0098] The embodiments of the present disclosure also provide an interactive system, which includes the virtual reality device according to the embodiments of the present disclosure.

[0099] In the description of the present disclosure, it should be noted that the terms "installation", "connection", "coupling" should be understood in a broad sense but not limited to a certain application unless otherwise specified and limited. For example, it can be a fixed connection, detachable connection or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a 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.

[0100] 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.

[0101] The above-described embodiments are merely specific embodiments of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, but not to limit the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any modification or easy-to-think change to the technical solutions recorded in the foregoing embodiments, or equivalent replacement of some technical features, within the technical scope disclosed by the present disclosure, should be understood as falling within the 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 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: the display image source is configured to emit circularly polarized light propagating along the first light propagation direction; the first lens has a convex entrance surface and a concave exit surface, and the circularly polarized light is transmitted to the entrance surface and the exit surface of the second lens through the entrance surface and the exit surface of the first lens to propagate to the second lens; the entrance surface of the second lens is convex, the exit surface is flat, and an optical composite film layer is arranged on the exit surface, 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, and the second circularly polarized light is converted into second linearly polarized light through folding of the optical path, and the second propagation direction is opposite to the first light propagation direction; the third lens has a convex entrance surface and a concave or flat exit surface to propagate the second linearly polarized light along the first light propagation direction for imaging. The optical elements with optical power in the optical lens module only include the first lens, the second lens and the third lens, the focal length f1 of the first lens satisfies: -100mm < f1 < -60mm, the focal length f2 of the second lens satisfies: 60mm < f2 < 100mm, and the focal length f3 of the third lens satisfies: 20mm < f3 < 60mm.

2. The optical lens assembly according to claim 1, wherein The focal length f1 of the first lens satisfies: 2F < |f1| < 4F, the focal length f2 of the second lens satisfies: 2F < |f2| < 4F, and the focal length f3 of the third lens satisfies: 1F < |f3| < 2F, F representing the system focal length of the optical lens module.

3. The optical lens assembly according to claim 2, wherein 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.

4. The optical lens assembly according to claim 1, wherein The thickness CT1 of the first lens on the principal axis and the optical total length TTL of the optical lens module satisfy: 0.05 ≤ CT1 / TTL ≤ 0.

3.

5. The optical lens assembly according to claim 1, wherein The thickness CT2 of the second lens on the principal axis and the optical total length TTL of the optical lens module satisfy: 0.2 ≤ CT2 / TTL ≤ 0.

4.

6. The optical lens assembly according to claim 1, wherein The thickness CT3 of the third lens on the principal axis and the optical total length TTL of the optical lens module satisfy: 0.2 ≤ CT3 / TTL ≤ 0.

4.

7. The optical lens assembly according to claim 1, wherein The aspheric surface profile curve of any one of the first lens, the second lens and the third lens is determined according to the following formula: wherein z is the sag, c is the curvature corresponding to the radius of curvature, r is the radial length, K is the conic quadratic coefficient, and a1 to a 10 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 an oblate circle.

8. The optical lens assembly according to claim 1, wherein The distance between the exit surface of the third lens and the human eye is not less than 12mm, and the range of the conical region formed between the exit surface of the third lens and the human eye is not less than 8mm.

9. The optical lens assembly according to claim 1, wherein The diopter coverage range of the optical lens module is 0D to -7D.

10. The optical lens assembly according to claim 1, wherein The field of view FOV of the optical lens module satisfies: 90° ≤ FOV ≤ 105°.

11. The optical lens assembly according to claim 1, wherein The refractive indexes of the first lens, the second lens and the third lens satisfy: 2.8≤Nd3+ Nd2≤3.4, |Nd3- Nd1|≤0.3, |Nd1- Nd2|≤0.3; 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.

12. The optical lens assembly according to claim 11, wherein, The Abbe numbers of the first lens, the second lens and the third lens satisfy: 100≤Vd3+ Vd2≤120, |Vd3- Vd1|≤35, |Vd1- Vd2|≤40; 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.

13. A virtual reality device, comprising: It comprises the optical lens module as claimed in any one of claims 1 to 12.

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