Optical lens module and virtual reality device

Abstract

The optical lens module comprises a display image source for emitting circularly polarized light rays propagating along a first light propagation direction; a first lens having a convex or planar light entrance surface and a convex light exit surface, through which the circularly polarized light rays are propagated to the light entrance surface and the light exit surface of a second lens; the second lens has a convex light entrance surface and a convex light exit surface; the third lens has a concave light entrance surface and a planar light exit surface, and an optical composite film layer is arranged on the light exit surface of the third lens; based on the optical composite film layer, the polarization state of the circularly polarized light rays is adjusted to form first linearly polarized light propagating along a second propagation direction, 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 light exit surface of the third lens through folding of the light path, so as to ensure good imaging effect, reduce the total optical length, and reduce the volume and weight.

Description

Technical Field

[0001] This disclosure relates to the field of electronic devices, specifically to an optical lens module and a virtual reality device. Background Technology

[0002] In virtual reality technology, image information is presented based on optical lens modules, and electrical signals generated by computer technology are combined with various output devices to transform the image information into objects that people can perceive. These objects can be similar to real objects or virtual objects.

[0003] Currently, existing optical lens modules are Fresnel lens groups or hyperboloid multi-lens groups, which have poor imaging effects, large size, and heavy weight. Summary of the Invention

[0004] In view of this, the present disclosure provides an optical lens module and a virtual reality device to overcome or alleviate the above-mentioned problems.

[0005] The technical solution adopted in this disclosure is as follows:

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

[0007] The display image source is used to emit circularly polarized light that propagates along the direction of the first light beam;

[0008] The first lens has a convex or flat incident surface and a convex exit surface. The circularly polarized light is propagated to the incident and exit surfaces of the second lens through its incident and exit surfaces.

[0009] The second lens has a convex incident surface and a convex exit surface to propagate the circularly polarized light to the third lens;

[0010] The third lens has a concave incident surface and a flat exit surface. An optical composite film is disposed on its exit 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.

[0011] A virtual reality device comprising the optical lens module described in any one of the embodiments of this disclosure.

[0012] In this embodiment, the first lens effectively compresses the volume of the circularly polarized light entering the first lens; the second lens, in conjunction with the third lens, enables the optical composite film layer disposed on the exit surface of the third lens to adjust the polarization state of the circularly polarized light and fold the optical path, correct residual aberrations, and simultaneously achieve high imaging resolution, ensuring good imaging effect. At the same time, it also makes the total optical length of the entire optical lens module small, greatly reducing the volume and weight of the optical lens module. Attached Figure Description

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

[0014] Figure 2 This is a schematic diagram of the optical lens module described in application scenario one;

[0015] Figure 3 The modulation transfer function diagram for application scenario one;

[0016] Figure 4 The diffusion pattern for application scenario one;

[0017] Figure 5 The field curvature and distortion curves for application scenario one;

[0018] Figure 6 This is a schematic diagram of the optical lens module described in application scenario two;

[0019] Figure 7 The modulation transfer function diagram for application scenario two;

[0020] Figure 8 The diffusion pattern for application scenario two;

[0021] Figure 9 The field curvature and distortion curves are for application scenario two.

[0022] Figure 10 This is a schematic diagram of the optical lens module described in application scenario three;

[0023] Figure 11 The modulation transfer function diagram for application scenario three;

[0024] Figure 12 For application scenario three, the diffusion pattern is shown.

[0025] Figure 13 The field curvature and distortion curves are for application scenario three.

[0026] Figure 14 This is a schematic diagram of the optical lens module described in application scenario four;

[0027] Figure 15 The modulation transfer function diagram for application scenario four;

[0028] Figure 16 For application scenario four, the diffusion pattern is shown.

[0029] Figure 17 The field curvature and distortion curves for application scenario four;

[0030] Figure 18 This is a schematic diagram illustrating the relationship between the human eye position and image quality in the aforementioned application scenarios disclosed in this publication. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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 1As 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 (or a flat surface in other embodiments) and a convex 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, so as to propagate the circularly polarized light to the second lens L2; ​​the second lens L2 has a convex 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 concave incident surface and a flat exit surface, and its exit surface... An optical composite film layer is provided on the surface. The circularly polarized light is received through the first lens and the second lens. Based on the optical composite film layer, the polarization state of the circularly polarized light is adjusted to form first linearly polarized light that propagates 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.

[0034] The light-incident surface of the first lens is convex or flat, and the light-outcident surface is convex. The light-incident surface of the second lens is convex, and the light-outcident surface is convex. The light-incident surface of the third lens is concave, and the light-outcident surface is flat. This is a description of the overall shape of the light-incident and light-outcident surfaces of the first, second, and third lenses. It does not mean that the thickness of the first, second, and third lenses must vary uniformly to meet the shape requirements of their respective light-incident and light-outcident surfaces.

[0035] 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.

[0036] In this embodiment, the first lens effectively compresses the volume of the circularly polarized light entering the first lens L1; the second lens, in conjunction with the third lens L3, enables the optical composite film layer disposed on the exit surface of the third lens L3 to adjust the polarization state of the circularly polarized light and fold the optical path, correct residual aberrations, and simultaneously achieve high imaging resolution, ensuring good imaging effect. At the same time, it also makes the total optical length of the entire optical lens module small, greatly reducing the volume and weight of the optical lens module.

[0037] In this embodiment, the materials of the first lens L1, the second lens L2, and the third lens L3 can be the same or different.

[0038] Furthermore, the focal length f1 of the first lens satisfies: 30mm < f1 < 130mm, giving the first lens L1 a large positive optical power, effectively compressing the volume of the circularly polarized light entering the first lens L1; the focal length f2 of the second lens satisfies: 50mm < f2 < 100mm, giving the second lens L2 a large positive optical power; simultaneously, the focal length f3 of the third lens satisfies: -150mm < f3 < -50mm, giving the third lens L3 a negative optical power, and an optical composite film layer is provided on the exit surface of the third lens L3, together realizing the polarization state adjustment of the circularly polarized light. Combined with the second lens L2, which has positive optical power, this achieves optical path folding, corrects residual aberrations, and results in high imaging resolution, ensuring good imaging effects. At the same time, it keeps the overall optical length of the optical lens module small, greatly reducing the size and weight of the optical lens module.

[0039] When the above-mentioned optical lens module is applied to wearable interactive devices (such as to realize virtual reality), the overall focus can be achieved by adjusting the distance between the display image source IMA and each lens; further adjusting the relative position of the first lens L1 with respect to the second lens L2 and the third lens L3 can achieve internal focus, which makes it convenient for nearsighted people to wear the device after removing their glasses.

[0040] Furthermore, since the first lens L1 has a convex or flat incident surface and a convex exit surface, it can achieve a large positive optical power to effectively compress the circularly polarized light before propagating to the second lens L2. The second lens L2 has a convex incident surface and a convex exit surface, which can further compress the circularly polarized light. The third lens L3 has a concave incident surface and a flat exit surface, achieving a positive optical power and converging the light beam emitted from the third lens. In addition, the optical composite film layer on the exit surface of the third lens L3 adjusts the polarization state of the circularly polarized light and folds the optical path, ensuring good imaging effect. At the same time, it makes the total optical length of the entire optical lens module small, greatly reducing the size and weight of the optical lens module.

[0041] Furthermore, in addition to satisfying the above-mentioned relationships, the focal lengths of each lens in the optical lens module are as follows: the focal length f1 of the first lens L1 satisfies: 1F < |f1| < 6F; the focal length f2 of the second lens L2 satisfies: 2F < |f2| < 4F; 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. This achieves both a thinner and lighter optical lens module and good imaging performance.

[0042] Optionally, the total optical 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 total optical length of the entire optical lens module.

[0043] Optionally, the thickness CT1 of the first lens on the main optical axis and the total optical length TTL of the optical lens module satisfy: 0.1≤CT1 / TTL≤0.3, thereby reducing the total optical length of the optical lens module.

[0044] Optionally, the thickness CT2 of the second lens L2 on the main optical axis satisfies the following condition with respect to the total optical length TTL of the optical lens module: 0.2≤CT2 / TTL≤0.4, thereby effectively realizing optical path folding and reducing the total optical length and volume of the optical lens module.

[0045] Optionally, 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 condition: 0.05≤CT3 / TTL≤0.1, thereby compressing the total length of the optical lens module and reducing the thickness of the optical lens module.

[0046] Optionally, the thickness CT2 of the second lens on the main optical axis and the edge thickness ET2 of the second lens satisfy: 2.5≤CT2 / ET2≤5.0, thereby effectively correcting the residual aberrations of the optical lens module.

[0047] Optionally, the effective optical diameter DM2 of the second lens and the thickness CT2 of the second lens on the main optical axis satisfy: 6.5≤DM2 / CT2≤7.0, thereby reducing the aperture of the optical lens module.

[0048] Optionally, the thickness CT3 of the third lens on the main optical axis and the air gap D3 between the second lens and the third lens on the main optical axis are: 4.0≤CT3 / D3≤7.0, thereby reducing the total optical path of the optical lens module and compressing the total length of the optical lens module.

[0049] Optionally, the aspherical 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:

[0050]

[0051] 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.

[0052] 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.

[0053] 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 10mm. 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.

[0054] 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 usage needs of most users.

[0055] Optionally, the diopter can be quickly adjusted by moving the display image source.

[0056] Optionally, the field of view (FOV) of the optical lens module satisfies: 90°≤FOV≤105°, thereby reducing dizziness and improving immersion.

[0057] 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|≤0.1, and |Nd1-Nd2|≤0.2; 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.

[0058] Furthermore, the Abbe numbers of the first lens L1, the second lens L2, and the third lens L3 satisfy: 70≤Vd3+Vd2≤85, |Vd3-Vd1|≤40, |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.

[0059] In one embodiment, the refractive index represents the ratio of the speed of light in a vacuum to the speed of light in a lens, while the Abbe number (also known as the dispersion coefficient) is used to measure the imaging quality of the lens. Generally, the Abbe number is inversely proportional to the refractive index of the lens; a higher refractive index indicates a stronger ability to refract incident light. When the refractive index of the lens is large, the Abbe number is small, the dispersion is more pronounced, and the imaging quality is worse; conversely, a smaller refractive index results in better imaging quality. Therefore, in this embodiment, by setting the refractive index and Abbe number of each lens as described above, aberration correction can be achieved, thereby ensuring high image resolution.

[0060] Optionally, in one embodiment, the light-incident surface of the second lens L2 is further coated with a semi-transparent and semi-reflective film, thereby cooperating with the optical composite film layer to adjust the polarization state of the circularly polarized light to form a first linearly polarized light propagating along the second propagation direction, and converting the first linearly polarized light into a second circularly polarized light, and then converting the second circularly polarized light into a second linearly polarized light through optical path folding.

[0061] Optionally, the optical composite film layer includes a first film layer, a second film layer, a third film layer, and a fourth film layer sequentially arranged along the first light propagation direction. The first film layer is used to perform anti-reflection treatment on 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 image contrast. The second film layer is used to adjust the polarization state of the circularly polarized light to generate first linearly polarized light propagating along the first light propagation direction. The polarization direction of the first linearly polarized light is perpendicular to the transmission axis of the third film layer, so that the third film layer is used to reflect the first linearly polarized light to generate first linearly polarized light propagating along the second propagation direction. The first linearly polarized light is then processed by the second film layer to achieve a further adjustment of its polarization state to generate second circularly polarized light, which is then sequentially incident on the second lens L2 and reflected by the semi-transparent and semi-reflective film coated on the light-incident surface of the second lens L2 to complete the folding of the optical path. Then, the light exits from the exit surface of the second lens L2 and enters the third lens L3. It then passes through the first and second film layers on the incident surface of the third lens L3, causing the second circularly polarized light to be converted into second linearly polarized light. The polarization 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 exit surface of the third lens L3. The fourth film layer is used to reinforce the light leakage of the third film layer and does not change the above 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.

[0062] The specific implementation of the first, second, third, and fourth membrane layers can be determined according to the requirements of the application scenario.

[0063] Based on the above description of the embodiments of this disclosure, the configuration of each lens will be described in the following exemplary manner in combination with the needs of specific application scenarios.

[0064] Application Scenario (1): f1 = 46.75mm, f2 = 70.42mm, f3 = -108.99mm, TTL = 24.71mm, CT2 / ET2 = 3.88, DM2 / CT2 = 6.71, CT3 / D3 = 5.30.

[0065] Table 1

[0066]

[0067] Table 1 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.

[0068] Table 2

[0069]

[0070]

[0071] Table 2 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.

[0072] Table 3

[0073]

[0074] Table 3 shows the refractive power of the image source at different locations.

[0075] Table 4

[0076]

[0077] Table 4 shows the stationary point design data for each lens in the optical lens module. The "stationary point position" is the vertical distance from the stationary point set on the surface of each lens in Example 1 to the main optical axis of the optical lens module.

[0078] Figure 2 This is a schematic diagram of the optical lens module described in application scenario one; as follows: Figure 2 As shown, the first lens has a convex incident surface and a convex exit surface, the second lens has a convex incident surface and a convex exit surface, and the third lens has a concave incident surface and a flat exit surface.

[0079] Figure 3The modulation transfer function diagram for application scenario one; as shown. Figure 3 As shown, the horizontal axis represents the number of line pairs per millimeter (spatial frequency in cycles per mm) on the imaging surface, with units of lp / mm, 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.

[0080] 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:

[0081] (1) Image height of 9.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0082] (2) Image height of 0.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF4;

[0083] (3) Image quality with an image height of 0.00 mm and a meridional ray (Tangential) is characterized by a modulation transfer function labeled MTF4.

[0084] (4) Image height of 9.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF3;

[0085] (5) Image height of 18.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF2;

[0086] (6) Image height is 18.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF1;

[0087] See Figure 3 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.

[0088] The above Figure 3 The specific image source parameters selected are merely examples and are not unique limitations.

[0089] Figure 4 This is the diffusion pattern for application scenario one; by Figure 4As 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 11 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 11 display image sources are denoted as IMA(0.000,0.000mm), IMA(0.000,1.800mm), IMA(0.000,3.600mm), IMA(0.000,5.400mm), IMA(0.000,7.200mm), IMA(0.000,9.000mm), IMA(0.000,10.800mm), IMA(0.000,12.600mm), IMA(0.000,14.400mm), IMA(0.000,16.200mm), and IMA(0.000,18.000mm).

[0090] like Figure 4 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 11 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.

[0091] 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 (F-Tan(Theta) 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 In the figure, the distortion value is located to the left of 0 and shows a linear change, indicating that the field curvature correction of the scheme in the present embodiment is good and the distortion has no inversion.

[0092] Application Scenario (II): f1 = 51.66mm, f2 = 73.86mm, f3 = -113.93mm, TTL = 24.71mm, CT2 / ET2 = 3.33, DM2 / CT2 = 6.51, CT3 / D3 = 4.81.

[0093] Table 5

[0094]

[0095] Table 5 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.

[0096] Table 6

[0097] Face number K [alpha]4 [alpha]6 [alpha]8 S1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 1.08E+01 -2.47E-05 6.81E-08 -1.04E-10 S3 -1.32E+01 -8.51E-06 2.17E-08 -6.20E-11 S4 -6.48E+01 -4.58E-06 -9.29E-10 -8.63E-12 S5 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0098] Table 6 shows the parameters of each lens, including the aspherical parameters of each lens, the conic quadratic coefficients of the lens, and the corresponding coefficients of each radial coordinate on the radius of curvature.

[0099] Table 7

[0100]

[0101] Table 7 shows the refractive power of the image source at different locations. Figure 6 This is a schematic diagram of the optical lens module described in application scenario two. The shapes of the first lens and the second lens are the same as described above. Figure 2 The optical lens module differs from the first application scenario in that its optical thickness has increased.

[0102] Table 8

[0103]

[0104]

[0105] Table 8 shows the stationary point design data for each lens in the optical lens module. The "stationary point position" is the vertical distance from the stationary point set on the surface of each lens in Embodiment 2 to the main optical axis of the optical module.

[0106] Figure 7 The modulation transfer function diagram for application scenario two is shown below; Figure 7 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.

[0107] 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:

[0108] (1) Image height of 9.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0109] (2) Image height of 0.00 mm, meridional ray (Tangential) imaging quality, the corresponding modulation transfer function is labeled MTF4;

[0110] (3) Image height of 0.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF4;

[0111] (4) Image height of 18.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF3;

[0112] (5) Image height of 9.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF2;

[0113] (6) Image height is 18.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF1;

[0114] See Figure 7 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.

[0115] The above Figure 7 The specific image source parameters selected are merely examples and are not unique limitations.

[0116] Figure 8 This is the diffusion pattern for application scenario two; by Figure 8 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 11 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 11 display image sources are denoted as IMA(0.000,0.000mm), IMA(0.000,1.915mm), IMA(0.000,3.830mm), IMA(0.000,5.745mm), IMA(0.000,7.660mm), IMA(0.000,9.575mm), IMA(0.000,11.490mm), IMA(0.000,13.405mm), IMA(0.000,15.320mm), IMA(0.000,17.235mm), and IMA(0.000,19.150mm).

[0117] like Figure 8As shown, the size of the blur spot is on the vertical axis. It can be seen that under the image source parameters of the 11 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.

[0118] Figure 9 This is a graph showing the field curvature and distortion curves for application scenario two. For example... Figure 9 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 9 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 9 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.

[0119] Application Scenario (3): f1 = 123.63mm, f2 = 62.51mm, f3 = -117.79mm, TTL = 24.3mm, CT2 / ET2 = 2.51, DM2 / CT2 = 6.88, CT3 / D3 = 4.76.

[0120] Table 9

[0121]

[0122] Table 9 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.

[0123] Table 10

[0124] Face number K [alpha]4 <![CDATA[α6]]> <![CDATA[α8]]> S1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 8.82E+00 -1.71E-05 3.40E-08 -6.15E-11 S3 4.69E+00 6.29E-07 -9.75E-09 -1.25E-11 S4 -1.29E+01 2.77E-06 -8.23E-09 2.78E-12 S5 1.14E+00 -3.89E-05 -8.97E-08 2.72E-10 S6 -1.21E+01 1.02E-05 -1.98E-07 4.64E-10

[0125] Table 10 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.

[0126] Table 11

[0127]

[0128] Table 11 shows the refractive power of the image source at different locations.

[0129] Figure 10 This is a schematic diagram of the optical lens module described in application scenario three, as shown below. Figure 10 As shown, the incident surface of the first lens L1 is a plane.

[0130] Table 12

[0131]

[0132] Table 12 shows the stationary point design data for each lens in the optical lens module. The "stationary point position" is the vertical distance from the stationary point set on the surface of each lens to the main optical axis of the optical module.

[0133] Figure 11 The modulation transfer function diagram for application scenario three is shown below; Figure 11 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.

[0134] 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:

[0135] (1) Image height of 9.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0136] (2) Image height of 9.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF4;

[0137] (3) Image height of 18.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF3;

[0138] (4) Image height of 18.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF2;

[0139] (5) Image quality with an image height of 0.00 mm and a meridional ray (Tangential) is given by a modulation transfer function labeled MTF1.

[0140] (6) Image height of 0.00 mm, Sagittal imaging quality, the corresponding modulation transfer function is labeled MTF1;

[0141] The value of the modulation transfer function is greater than the threshold value of another modulation transfer function with better resolution by 0.2, therefore, it has better resolution.

[0142] The above Figure 11 The specific image source parameters selected are merely examples and are not unique limitations.

[0143] Figure 12 For the diffusion pattern in application scenario three; by Figure 12 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, 11 sets of image source parameters of the displayed image source are used as examples to illustrate the technical effects of the embodiments of this disclosure from the perspective of field of view blur. In this embodiment, 11 sets of image source parameters of the displayed image source are used as examples to illustrate the technical effects of the embodiments of this disclosure from the perspective of field of view blur. The image source parameters of the 11 display image sources are denoted as IMA(0.000,0.000mm), IMA(0.000,1.800mm), IMA(0.000,3.600mm), IMA(0.000,5.400mm), IMA(0.000,7.200mm), IMA(0.000,9.000mm), IMA(0.000,10.800mm), IMA(0.000,12.600mm), IMA(0.000,14.400mm), IMA(0.000,16.200mm), and IMA(0.000,18.000mm).

[0144] like Figure 12 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 11 sets of display image sources, the size of the blur spot is smaller than the other blur spot size threshold (e.g., 100um) when the matching image quality is better. Therefore, the image quality is good.

[0145] Figure 13 This is a graph showing the field curvature and distortion curves for application scenario three. For example... Figure 13 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 13 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 13Since 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.

[0146] Application Scenario (4): f1 = 38.87mm, f2 = 69.05mm, f3 = -110.71mm, TTL = 25.0mm, CT2 / ET2 = 5.00, DM2 / CT2 = 6.96, CT3 / D3 = 6.36.

[0147] Table 13

[0148]

[0149] Table 13 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.

[0150] Table 14

[0151] Face number K <![CDATA[α4]]> <![CDATA[α6]]> <![CDATA[α8]]> S1 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 8.82E+00 -1.71E-05 3.40E-08 -6.15E-11 S3 4.69E+00 6.29E-07 -9.75E-09 -1.25E-11 S4 -1.29E+01 2.77E-06 -8.23E-09 2.78E-12 S5 1.14E+00 -3.89E-05 -8.97E-08 2.72E-10 S6 -1.21E+01 1.02E-05 -1.98E-07 4.64E-10

[0152] Table 14 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.

[0153] Table 15

[0154]

[0155] Table 15 shows the refractive power of the image source at different locations. Figure 14 This is a structural schematic diagram of the optical lens module described in application scenario four, and is consistent with the above. Figure 2 The difference is that the incident surface of the first lens L1 is planar, and the core thickness of the first lens L1 is increased. The shapes of the first lens L1 and the second lens L2 are similar to... Figure 2 The ones in the text are also different.

[0156] Table 16

[0157]

[0158] Table 16 shows the stationary point design data for each lens in the optical lens module. The "stationary point position" is the vertical distance from the stationary point set on the surface of each lens to the main optical axis of the optical module.

[0159] Figure 15 The modulation transfer function diagram for application scenario four is shown below; Figure 15As 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.

[0160] 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:

[0161] (1) Image height of 9.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF5;

[0162] (2) Image height of 0.00 mm, meridional ray (Tangential) imaging quality, the corresponding modulation transfer function is labeled MTF4;

[0163] (3) Image height of 0.00 mm, Sagittal imaging quality, and its corresponding modulation transfer function is labeled MTF4;

[0164] (4) Image height of 18.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF3;

[0165] (5) Image height of 9.00 mm, meridional imaging quality, and its corresponding modulation transfer function is labeled MTF2;

[0166] (6) The image height is 18.00 mm, the sagittal imaging quality, and the corresponding modulation transfer function is labeled MTF1.

[0167] The value of the modulation transfer function is greater than the threshold value of another modulation transfer function with better resolution by 0.2, therefore, it has better resolution.

[0168] The above Figure 15 The specific image source parameters selected are merely examples and are not unique limitations.

[0169] Figure 16 For the diffusion pattern in application scenario four; by Figure 16As can be seen, the image source parameters of the displayed image source are denoted as (center field of view, image height). In this embodiment, 11 sets of image source parameters of the displayed image source are used as examples to illustrate the technical effects of the embodiments of this disclosure from the perspective of field of view blur. In this embodiment, 11 sets of image source parameters of the displayed image source are used as examples to illustrate the technical effects of the embodiments of this disclosure from the perspective of field of view blur. The image source parameters of the 11 display image sources are denoted as IMA(0.000,0.000mm), IMA(0.000,1.800mm), IMA(0.000,3.600mm), IMA(0.000,5.400mm), IMA(0.000,7.200mm), IMA(0.000,9.000mm), IMA(0.000,10.800mm), IMA(0.000,12.600mm), IMA(0.000,14.400mm), IMA(0.000,16.200mm), and IMA(0.000,18.000mm).

[0170] like Figure 16 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 11 sets of display image sources, the size of the blur spot is smaller than the other blur spot size threshold (e.g., 100um) when the matching image quality is better. Therefore, the image quality is good.

[0171] Figure 17 This is a graph showing the field curvature and distortion curves for application scenario four. For example... Figure 17 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 17 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 17 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.

[0172] Figure 18 This is a schematic diagram illustrating the relationship between the human eye position and image quality in the application scenarios described above; the planes containing positions A, C, D, E, and F are parallel to the image plane. Figure 18As shown, since position B is located on the principal optical axis of the optical lens module, the aberration is relatively small. However, when the human eye is located at positions A, C, D, E, and F, it is not on the principal optical axis. Therefore, the image quality is best when the human eye is located at position B, while there are large residual aberrations at other positions, resulting in poor image quality.

[0173] This disclosure also provides a virtual reality device, which may include, but is not limited to, VR all-in-one machines, VR headsets, VR glasses, etc., and includes the optical lens module described in any one of the embodiments of this disclosure.

[0174] This disclosure also provides an interactive system, which includes the virtual reality device provided in any embodiment of this disclosure.

[0175] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0176] Furthermore, the technical features involved in the different embodiments of this disclosure described below can be combined with each other as long as they do not conflict with each other.

[0177] The above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and are not intended to limit it. The scope of protection of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this disclosure. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be covered within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An optical lens module, characterized in that, include: A display image source, a first lens, a second lens, and a third lens are 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 or flat incident surface and a convex exit surface. The circularly polarized light is propagated to the incident and exit surfaces of the second lens through its incident and exit surfaces. The light-incident surface of the second lens is a convex surface coated with a semi-transparent and semi-reflective film, and the light-out surface is a convex surface, so as to propagate the circularly polarized light to the third lens; The third lens has a concave incident surface and a flat exit surface. An optical composite film is disposed on its exit 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. The second circularly polarized light then enters the second lens and is reflected by the semi-transparent and semi-reflective film deposited on the incident surface of the second lens to complete the folding of the light path. It then exits from the exit surface of the second lens and enters the third lens, where the second circularly polarized light is converted into a second linearly polarized light that passes 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. Wherein, when the direction from the display image source to the third lens is taken as the positive direction of light propagation, the first lens and the second lens have positive optical power, and the third lens has negative optical power; and the focal length f1 of the first lens satisfies: 1F < |f1| < 6F; the focal length f2 of the second lens satisfies: 2F < |f2| < 4F; the focal length f3 of the third lens satisfies: 4F < |f3| < 6F, where F represents the system focal length of the optical lens module.

2. The optical lens module according to claim 1, characterized in that, The focal length f1 of the first lens satisfies: 30mm < f1 < 130mm, the focal length f2 of the second lens satisfies: 50mm < f2 < 100mm, and the focal length f3 of the third lens satisfies: -150mm < f3 < -50mm.

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 respectively: f1 = 46.75 mm, f2 = 70.42 mm, f3 = -108.99 mm; or f1 = 51.66 mm, f2 = 73.86 mm, f3 = -113.93 mm; or f1 = 123.63 mm, f2 = 62.51 mm, f3 = -117.79 mm; or f1 = 38.87 mm, f2 = 69.05 mm, f3 = -110.71 mm.

4. The optical lens module according to claim 1, characterized in that, The thickness CT2 of the second lens on the principal optical axis and the edge thickness ET2 of the second lens satisfy: 2.5≤CT2 / ET2≤5.

0.

5. The optical lens module according to claim 4, characterized in that, The effective optical diameter DM2 of the second lens and the thickness CT2 of the second lens on the principal optical axis satisfy the following: 6.5≤DM2 / CT2≤7.

0.

6. The optical lens module according to claim 5, characterized in that, The thickness CT3 of the third lens on the principal optical axis and the air gap D3 between the second lens and the third lens on the principal optical axis: 4.0≤CT3 / D3≤7.

0.

7. The optical lens module according to claim 6, characterized in that, CT2 / ET2= 3.88, DM2 / CT2= 6.71, CT3 / D3=5.30; or, CT2 / ET2= 3.33, DM2 / CT2= 6.51, CT3 / D3=4.81; CT2 / ET2=2.51, DM2 / CT2= 6.88, CT3 / D3=4.76; CT2 / ET2=5.00, DM2 / CT2= 6.96, CT3 / D3=6.

36.

8. 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 At time 1, the surface profile of the lens is a hyperbola; when K equals... When K is 1, the surface profile of the lens is a parabola; when K is between 1 and 2, the surface profile of the lens is a parabola. When K is between 1 and 0, the surface curve of the lens is elliptical; when K equals 0, the surface curve of the lens is circular; and when the coefficient K is greater than 0, the surface curve of the lens is oval.

9. 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.

10. The optical lens module according to claim 1, characterized in that, The optical lens module has a refractive power range of 0D to -7D.

11. 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: 2.8≤Nd3+ Nd2≤3.4, |Nd3- Nd1|≤0.1, |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.

12. The optical lens module according to claim 11, characterized in that, The Abbe numbers of the first lens, the second lens, and the third lens satisfy: 70≤Vd3+Vd2≤85,|Vd3-Vd1|≤40,|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.

13. A virtual reality device, characterized in that, It includes the optical lens module as described in any one of claims 1-12.

Images