WO2024021510A1 - Optical lens module and virtual reality device - Google Patents

Abstract

An optical lens module and a virtual reality device. The optical lens module comprises: a display image source (IMA) used for emitting circularly polarized light propagating along a first light propagation direction; a first lens (L1) having a light incident surface that is a convex surface or a plane and an emergent surface that is a convex surface, wherein the circularly polarized light is propagated to an incident surface and an emergent surface of a second lens (L2) by means of the light incident surface and the emergent surface of the first lens (L1); the second lens (L2) having a light incident surface that is a convex surface and an emergent surface that is a convex surface; and a third lens (L3) having a light incident surface that is a concave surface and an emergent surface that is a plane, wherein an optical composite film layer is configured on the emergent surface of the third lens (L3). On the basis of the optical composite film layer, the polarization state of the circularly polarized light is adjusted to form first linearly polarized light which propagates in a second propagation direction, and the first linearly polarized light is converted into second circularly polarized light. Next, by means of folding an optical path, the second circularly polarized light is converted into second linearly polarized light so as to pass through the emergent surface of the third lens (L3), such that an excellent imaging effect is ensured, the total optical length is small, and the size and weight are reduced.

Description

Optical lens modules and virtual reality equipment

This application requires a Chinese invention patent application with an application date of September 16, 2022, an application number of "202211131398.3", and a patent name of "Optical Lens Module and Virtual Reality Equipment", and an application date of July 27, 2022. The priority of the Chinese invention patent application with application number "202210892394.0" and patent name "Near-Eye Virtual Reality Optical Module" is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of electronic equipment, and specifically relates to an optical lens module and a virtual reality device.

Background technique

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 can be felt by people. These objects can be similar to It can be a real object or a virtual object.

At present, the existing optical lens modules are Fresnel lens groups or hyperboloid multi-lens groups, which have poor imaging effects, are large in size and heavy in weight.

Contents of the invention

In view of this, embodiments of the present disclosure provide an optical lens module and a virtual reality device to overcome or alleviate the above problems.

The technical solutions adopted in this disclosure are:

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

The display image source is used to emit circularly polarized light propagating along the first light propagation direction;

The light incident surface of the first lens is a convex surface or a flat surface, and the exit surface is a convex surface. The circularly polarized light is propagated to the entrance surface and exit surface of the second lens through its light entrance surface and exit surface, so as to transmit all the light to the second lens. The circularly polarized light propagates to the second lens;

The light incident surface of the second lens is a convex surface and the exit surface is a convex surface to propagate the circularly polarized light to the third lens;

The light incident surface of the third lens is a concave surface, the exit surface is a plane, and an optical composite film layer is provided on the exit surface. The circularly polarized light is received through the first lens and the second lens, and based on the optical The composite film layer adjusts the polarization state of the circularly polarized light to form the first linearly polarized light propagating along the second propagation direction, and converts the first linearly polarized light into the second circularly polarized light, and then passes through the optical path Folding, converting the second circularly polarized light into a second linearly polarized light to pass through the exit surface of the third lens, the second linearly polarized light propagating along the first light propagation direction for imaging, the The second propagation direction is opposite to the first light propagation direction.

A virtual reality device includes the optical lens module described in any one of the embodiments of the present disclosure.

In the embodiment of the present disclosure, the first lens functions to effectively compress the volume of the circularly polarized light entering the first lens; the second lens cooperates with the third lens so that the exit surface of the third lens The optical composite film layer provided realizes the adjustment of the polarization state of the circularly polarized light and the folding of the optical path, corrects the residual aberration, and at the same time makes the imaging resolution higher, ensuring a good imaging effect, and at the same time making the entire optical lens module The total optical length is smaller, which greatly reduces the size and weight of the optical lens module.

Description of drawings

Figure 1 is a schematic structural diagram of an optical lens module according to an embodiment of the present disclosure;

Figure 2 is a schematic structural diagram of the optical lens module described in application scenario one;

Figure 3 shows the modulation transfer function diagram of application scenario 1;

Figure 4 shows the diffusion pattern of application scenario 1;

Figure 5 is the field curvature and distortion curve of application scenario 1;

Figure 6 is a schematic structural diagram of the optical lens module described in application scenario 2;

Figure 7 shows the modulation transfer function diagram of application scenario 2;

Figure 8 shows the diffusion pattern of application scenario 2;

Figure 9 is the field curvature and distortion curve of application scenario 2.

Figure 10 is a schematic structural diagram of the optical lens module described in application scenario three;

Figure 11 is the modulation transfer function diagram of application scenario three;

Figure 12 shows the diffusion pattern of application scenario three;

Figure 13 is the field curvature and distortion curve of application scenario three.

Figure 14 is a schematic structural diagram of the optical lens module described in application scenario four;

Figure 15 is the modulation transfer function diagram of application scenario four;

Figure 16 shows the diffusion pattern of application scenario four;

Figure 17 is the field curvature and distortion curve of application scenario four;

Figure 18 is a schematic diagram of human eye position and imaging quality in the above application scenario of the present disclosure.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present disclosure clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description. It does not indicate or imply that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on the present disclosure. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Figure 1 is a schematic structural diagram of an optical lens module according to an embodiment of the present disclosure; as shown in Figure 1, the optical lens module includes: a display image source IMA, a first lens L1, a Two lenses L2 and a third lens L3, wherein: the display image source IMA is used to emit circularly polarized light propagating along the first light propagation direction; the light incident surface of the first lens L1 is a convex surface (in other embodiments , or a plane), the exit surface is a convex surface, and the circularly polarized light is propagated to the incident surface and exit surface of the second lens L2 through its light incident surface and exit surface, so as to propagate the circularly polarized light to the The second lens L2; the light incident surface of the second lens L2 is a convex surface, and the exit surface is a convex surface, so as to propagate the circularly polarized light to the third lens; the light incident surface of the third lens L3 is Concave surface, the exit surface is a plane, and an optical composite film layer is provided on the exit surface. The circularly polarized light is received through the first lens and the second lens, and the circularly polarized light is adjusted based on the optical composite film layer. polarization state to form first linearly polarized light propagating along the second propagation direction, converting the first linearly polarized light into second circularly polarized light, and then converting the second circularly polarized light through the folding of the optical path 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 for imaging, and the second propagation direction is consistent with the first light propagation direction. The propagation directions are opposite, for example, the first light propagation direction is directed toward the third lens L3 along the display image source IMA, and the second light propagation direction is directed toward the display image source IMA along the third lens L3.

The light incident surface of the first lens is a convex surface or a flat surface, and the exit surface is a convex surface. The light incident surface of the second lens is a convex surface, and the exit surface is a convex surface. The light entrance surface of the third lens is a concave surface, and the exit surface is a convex surface. is a plane, which describes the overall shape of the light incident surface and exit surface of the first lens, the second lens, and the third lens. It does not limit the thickness of the first lens, the second lens, and the third lens to change uniformly to meet the requirements. Shape requirements for respective light incident and exit surfaces.

The optical path from the display image source to the third lens L3 is shown in FIG. 1 , ultimately forming the second linearly polarized light propagating along the first light propagation direction and passing through the third lens to enter the human eye.

In this embodiment, the first lens effectively compresses the volume of the circularly polarized light entering the first lens L1; the second lens cooperates with the third lens L3, so that the output of the third lens L3 The optical composite film layer provided on the surface realizes the adjustment of the polarization state of the circularly polarized light and the folding of the optical path, corrects the residual aberration, and at the same time makes the imaging resolution higher, ensuring a good imaging effect, and at the same time making the entire optical lens The total optical length of the module is smaller, which greatly reduces the volume and weight of the optical lens module.

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

Further, the focal length f1 of the first lens satisfies: 30mm＜f1＜130mm, so that the first lens L1 has a larger positive optical power, which effectively compresses the circular polarization entering the first lens L1. The volume of light; the focal length f2 of the second lens satisfies: 50mm<f2<100mm, so that the second lens L2 has a larger positive optical power; at the same time, the focal length f3 of the third lens satisfies: -150mm< f3<-50mm, so that the third lens L3 has negative refractive power, and an optical composite film layer is provided on the exit surface of the third lens L3, which together realizes the adjustment of the polarization state of the circularly polarized light, and then Cooperating with the second lens L2 with positive optical power, the folding of the optical path is realized, the residual aberration is corrected, and the imaging resolution is higher, ensuring good imaging effect, and making the total optical length of the entire optical lens module longer. Small, greatly reducing the size and weight of the optical lens module.

When the above optical lens module is applied to a wearable interactive device (for example, to realize virtual reality), the overall focusing can be achieved by adjusting the distance of the display image source IMA relative to each lens; and then further adjusting the distance of the first lens L1 relative to the first lens L1. The relative position of the second lens L2 and the third lens L3 enables internal focusing, making it easier for people with myopia to take off their glasses and wear them.

In addition, since the light incident surface of the first lens L1 is a convex surface or a flat surface and the exit surface is a convex surface, a large positive power can be achieved to effectively compress the circularly polarized light and then propagate it to the second lens L2. The light incident surface of the second lens L2 is a convex surface and the exit surface is a convex surface, so that the circularly polarized light can be further compressed. The light incident surface of the third lens L3 is a concave surface and the exit surface is a flat surface, thereby achieving positive optical power of the third lens L3, so that the light beam emitted from the third lens L3 can be converged. In addition, through the third lens L3 The optical composite film layer provided on the exit surface of the three lenses L3 realizes the adjustment of the polarization state of the circularly polarized light and the folding of the optical path, ensuring a good imaging effect, and at the same time making the total optical length of the entire optical lens module smaller, greatly reducing the cost. The size and weight of the optical lens module are reduced.

Further, in addition to the focal length of each lens of the optical lens module satisfying the above relationship, 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; the focal length f3 of the third lens L3 satisfies: 4F＜|f3|＜6F, F represents the system focal length of the optical lens module, thereby realizing the lightness and thinness of the optical lens module At the same time, good imaging effects are ensured.

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 overall optical lens module. The total optical length of the group.

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.

Optionally, the thickness CT2 of the second lens L2 on the main optical axis and the total optical length TTL of the optical lens module satisfy: 0.2≤CT2/TTL≤0.4, thereby effectively realizing optical path folding and reducing the size of the optical lens The total optical length and volume of the module.

Optionally, the thickness CT3 of the third lens L3 on the main optical axis satisfies the total optical length TTL of the optical lens module: 0.05≤CT3/TTL≤0.1, thereby compressing the total length of the optical lens module and reducing the optical length. The thickness of the lens module.

Optionally, the thickness CT2 of the second lens on the main optical axis and the side thickness ET2 of the second lens satisfy: 2.5≤CT2/ET2≤5.0, thereby effectively correcting the residual aberration of the optical lens module.

Optionally, the effective optical diameter DM2 of the main 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.

Optionally, the thickness CT3 of the third lens on the main optical axis and the air distance D3 between the second lens and the third lens on the main optical axis: 4.0≤CT3/D3≤7.0, thereby reducing The total optical path of the optical lens module, the total length of the compressed optical lens module.

Optionally, the aspheric surface shape 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:

Among them, z is the sagittal height, c is the curvature corresponding to the radius of curvature, r is the radial length, K is the conic conic coefficient, α ₁ to α ₁₀ respectively represent the coefficients corresponding to each radial coordinate on the radius of curvature; when K When K is less than -1, the surface curve of the lens is a hyperbola. When K is equal to -1, the surface curve of the lens is a parabola. When K is between -1 and 0, the surface curve of the lens is an ellipse. When K is equal to 0, the surface curve of the lens is circular. When the K coefficient is greater than 0, the surface curve of the lens is oblate.

Based on the above formula for determining the surface shape curve of an aspheric surface, a reasonable aspheric surface can be configured according to the needs of the application scenario, such as the above-mentioned convex surface or concave surface.

Optionally, the distance between the exit surface of the third lens L3 and the human eye is not less than 12 mm, and the conical area formed between the exit surface of the third lens L3 and the human eye is not less than 10 mm, thereby facilitating display. The image source is processed by the optical lens module to form the best imaging position, so as to enhance the user's experience and facilitate the user to quickly adjust to the best imaging position.

Optionally, the diopter coverage range of the optical lens module is 0D ~ -7D, thereby ensuring that the optical lens module has good screen clarity performance and can meet the needs of most users.

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

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

Optionally, the refractive index of the first lens L1, the second lens L2 and the third lens L3 satisfies: 2.8≤Nd3+Nd2≤3.4, |Nd3-Nd1|≤0.1, |Nd1-Nd2|≤0.2; Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, and Nd3 is the refractive index of the third lens L3.

Further, 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; 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.

In one embodiment, the refractive index is used to represent the ratio of the propagation speed of light in vacuum to the propagation speed of light in the lens. The Abbe number (also known as the dispersion coefficient) is used to measure the imaging quality of the lens, and usually , the Abbe number is inversely proportional to the refractive index of the lens. The higher the refractive index, the stronger the ability to refract incident light. When the refractive index of the lens is larger, the Abbe number is smaller, the dispersion is more obvious, and the imaging quality is worse. On the contrary, the imaging quality is better. Therefore, in this embodiment, the aberration can be corrected through the refractive index and Abbe number of each lens set above, thereby ensuring high resolution of imaging.

Optionally, in one embodiment, the light incident surface of the second lens L2 is also coated with a semi-transparent and semi-reflective film, so as to cooperate with the optical composite film layer to adjust the polarization state of the circularly polarized light to form a light beam along the second lens L2. The first linearly polarized light propagates in two propagation directions, and the first linearly polarized light is converted into the second circularly polarized light, and then the second circularly polarized light is converted into the second linearly polarized light through the folding of the optical path.

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, and the first film layer is used to The above-mentioned circularly polarized light is subjected to anti-reflection treatment to avoid a large amount of reflection of the circularly polarized light, which effectively improves the overall transmittance of the system and increases the image contrast. The second film layer is used to adjust the polarization state of the circularly polarized light to generate first linearly polarized light that propagates along the second propagation direction, and the propagation direction of the first linearly polarized light is perpendicular to the transmission axis direction of the third film layer, Thereby, the third film layer is used to reflect the first linearly polarized light, so that the first linearly polarized light is processed by the second film layer, and the polarization state is readjusted to generate the second circularly polarized light, which is then incident into the third film layer. The second lens L2 is 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, and then exits from the exit surface of the second lens L2, enters the third lens L3, and then passes through the third lens L3 successively. The first film layer and the second film layer of the light incident surface of the three lenses L3 are processed to convert the second circularly polarized light into the second linearly polarized light. The propagation direction of the second linearly polarized light is consistent with the direction of the transmission axis 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 without changing the above polarization state. The second linearly polarized light passes along the The first light propagation direction propagates for imaging, and the second propagation direction is opposite to the first light propagation direction.

The specific implementation of the above-mentioned first film layer, second film layer, third film layer and fourth film layer can be determined according to the needs of the application scenario.

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

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.

Table 1

Table 1 shows the configuration details of each lens. Nd is the refractive index, Vd is Abbe's 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 in order. The surface number S2 , S4, and S6 are the light incident surfaces of the third lens L3, the second lens L2, and the first lens L1 in order.

Table 2

Face number	K	α 4	α 6	α 8
S1	0.00E+00	0.00E+00	0.00E+00	0.00E+00
S2	8.59E+00	-1.73E-05	3.78E-08	-6.92E-11
S3	1.56E+00	1.30E-07	-5.89E-09	-1.94E-11
S4	-9.20E+00	2.90E-06	-8.64E-09	1.09E-12
S5	2.44E+00	-3.59E-05	-8.41E-08	1.63E-10
S6	2.54E+01	-3.87E-06	-1.14E-07	2.83E-10

Table 2 shows the parameters of each lens, including the aspherical parameters of each lens, the conic coefficients of the lenses, and the corresponding relationships between the coefficients corresponding to each radial coordinate on the radius of curvature.

table 3

Table 3 shows the diopter of the image source at different positions.

Table 4

Table 4 shows the stagnation point design data of each lens in the optical lens module, where the "stagnation point position" is the vertical distance from the stagnation point set on the surface of each lens in Embodiment 1 to the main optical axis of the optical lens module.

Figure 2 is a schematic structural diagram of the optical lens module in application scenario one; as shown in Figure 2, the light incident surface of the first lens is a convex surface, the exit surface is a convex surface, and the light incident surface of the second lens is The light incident surface of the third lens is a concave surface, and the exit surface is a flat surface.

Figure 3 is the modulation transfer function diagram of application scenario 1; as shown in Figure 3, the abscissa represents the line pairs per millimeter on the imaging surface (Spatial Frequency in cycles per mm), the unit is lp/mm, and the ordinate represents the modulation transfer Function (Modulation Transfer Function, MTF) value. In order to preliminarily verify the effect of the disclosed solution, the following six image source parameters are configured to determine the modulation transfer function value.

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 ray (Tangential) imaging quality or sagittal ray (Sagittal) imaging quality. The details are as follows:

(1) Image height is 9.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF5;

(2) The image height is 0.00mm, the sagittal ray (Sagittal) imaging quality, and the corresponding modulation transfer function is marked MTF4;

(3) The image height is 0.00mm, the tangential imaging quality, and the corresponding modulation transfer function is marked MTF4;

(4) The image height is 9.00mm, the sagittal ray (Sagittal) imaging quality, and the corresponding modulation transfer function is marked MTF3;

(5) The image height is 18.00mm, the tangential imaging quality, and the corresponding modulation transfer function is marked MTF2;

(6) The image height is 18.00mm, the sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF1;

As shown in Figure 3, all modulation transfer function values are greater than the modulation transfer function value threshold 0.4 that matches better resolution, and therefore have better resolution.

The specific image source parameters selected in Figure 3 above are only examples and are not unique limitations.

Figure 4 is a diffusion pattern diagram of application scenario 1; it can be seen from Figure 4 that the image source parameters of the display image source are recorded as (center field of view, image height). In this embodiment, 11 sets of image source parameters of the display image source are taken as an example , the technical effects of the embodiments of the present disclosure are explained from the perspective of field of view dispersion. The image source parameters of the 11 groups of display image sources are recorded 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), IMA(0.000,18.000mm).

As shown in Figure 4, the size of the diffuse spots is the ordinate. It can be seen that under the image source parameters of the 11 groups of display image sources, the size of the diffuse spots is smaller than the diffuse spot size threshold when the matching imaging quality is good (for example, 50um), therefore, the image quality is good.

Figure 5 is the field curvature and distortion curve of application scenario 1. As shown in Figure 5, for field curvature (also called Field Curvature), the ordinate is the size of the field of view, and the abscissa represents the size of the field curvature, and its unit is millimeters; for distortion (F-Tan (Theta) Distortion) , its abscissa represents the distortion size (expressed as a percentage), S represents the field curvature in the sagittal direction, and T represents the field curvature in the meridional direction. As shown in Figure 5, the field curvature of the entire field of view is smaller than the field curvature threshold of the entire field of view, such as 0.5mm. Referring again to Figure 5, the distortion value is located to the left of 0 and shows a linear change, indicating that the solution of the embodiment of the present disclosure corrects the field curvature well and the distortion has no recurvature.

Application scenario (2): f1=51.66mm, f2=73.86mm, f3=-113.93mm, TTL=24.71mm, CT2/ET2=3.33, DM2/CT2=6.51, CT3/D3=4.81.

table 5

Table 5 shows the configuration details of each lens. Nd is the refractive index, Vd is Abbe's 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 in order. The surface number S2 , S4, and S6 are the light incident surfaces of the third lens L3, the second lens L2, and the first lens L1 in order.

Table 6

Face number	K	α 4	α 6	α 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

Table 6 shows the parameters of each lens, including the aspherical parameters of each lens, the conic conic coefficients of the lens, and the correspondence between the coefficients corresponding to each radial coordinate on the radius of curvature.

Table 7

Table 7 shows the diopter of the image source at different positions. Figure 6 is a schematic structural diagram of the optical lens module in application scenario two. The shapes of the first lens and the second lens are different from those in Figure 2. Compared with application scenario one, the optical thickness of the optical lens module is increased.

Table 8

Table 8 shows the stagnation point design data of each lens in the optical lens module, where the "stagnation point position" is the vertical distance from the stagnation point set on the surface of each lens in Embodiment 2 to the main optical axis of the optical module.

Figure 7 is the modulation transfer function diagram of application scenario 2; as shown in Figure 7, the abscissa represents the line pairs contained per millimeter on the imaging surface (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 disclosed solution, the following six image source parameters are configured to determine the modulation transfer function value.

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 ray (Tangential) imaging quality or sagittal ray (Sagittal) imaging quality. The details are as follows:

(1) Image height is 9.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF5;

(2) The image height is 0.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF4;

(3) Image height is 0.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF4;

(4) The image height is 18.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF3;

(5) The image height is 9.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF2;

(6) The image height is 18.00mm, the sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF1;

As shown in Figure 7, all modulation transfer function values are greater than the modulation transfer function value threshold 0.4 that matches better resolution, and therefore have better resolution.

The specific image source parameters selected in Figure 7 above are only examples and are not unique limitations.

Figure 8 shows the diffusion pattern of application scenario 2; it can be seen from Figure 8 that the image source parameters of the display image source are recorded as (center field of view, image height). In this embodiment, 11 sets of image source parameters of the display image source are taken as an example. , the technical effects of the embodiments of the present disclosure are explained from the perspective of field of view dispersion. The image source parameters of the 11 groups of display image sources are recorded 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), IMA(0.000,19.150mm).

As shown in Figure 8, the size of the diffuse spots is the ordinate. It can be seen that under the image source parameters of the 11 groups of display image sources, the size of the diffuse spots is smaller than the diffuse spot size threshold when the matching imaging quality is good (for example, 50um), therefore, the image quality is good.

Figure 9 is the field curvature and distortion curve of application scenario 2. As shown in Figure 9, for field curvature (also called Field Curvature), the ordinate is the size of the field of view, and the abscissa represents the size of the field curvature, and its unit is millimeters; for distortion (also called F-Tan ( Theta)Distortion), its abscissa represents the distortion size (expressed as a percentage), S represents the field curvature in the sagittal direction, and T represents the field curvature in the meridional direction. As shown in Figure 9, the field curvature of the entire field of view is smaller than the field curvature threshold of the entire field of view, such as 0.5mm. Referring again to Figure 9, since the distortion value is located to the left of 0, there is no inflection in the distortion. To this end, it is shown that the solution of the embodiment of the present disclosure corrects the field curvature well, and the distortion changes linearly.

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.

Table 9

Table 9 shows the configuration details of each lens. Nd is the refractive index, Vd is Abbe's 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 in order. The surface number S2 , S4, and S6 are the light incident surfaces of the third lens L3, the second lens L2, and the first lens L1 in order.

Table 10

Face number	K	α 4	α 6	α 8
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

Table 10 shows the parameters of each lens, including the aspherical parameters of each lens, the conic conic coefficients of the lens, and the correspondence between the coefficients corresponding to each radial coordinate on the radius of curvature.

Table 11

Table 11 shows the diopter of the image source at different positions.

Figure 10 is a schematic structural diagram of the optical lens module described in application scenario three. As shown in Figure 10, the light incident surface of the first lens L1 is a plane.

Table 12

Table 12 shows the stagnation point design data of each lens in the optical lens module, where the "stagnation point position" is the vertical distance from the stagnation point set on the surface of each lens to the main optical axis of the optical module.

Figure 11 is the modulation transfer function diagram of application scenario three; as shown in Figure 11, the abscissa represents the line pairs contained in every millimeter of the imaging surface (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 disclosed solution, the following six image source parameters are configured to determine the modulation transfer function value.

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 ray (Tangential) imaging quality or sagittal ray (Sagittal) imaging quality. The details are as follows:

(1) The image height is 9.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF5;

(2) Image height is 9.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF4;

(3) The image height is 18.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF3;

(4) The image height is 18.00mm, the sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF2;

(5) The image height is 0.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF1;

(6) Image height is 0.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF1;

The value of the modulation transfer function is greater than another modulation transfer function value threshold 0.2 that matches better resolution, and therefore has better resolution.

The specific image source parameters selected in Figure 11 above are only examples and are not unique limitations.

Figure 12 is the diffusion pattern of application scenario three; it can be seen from Figure 12 that the image source parameters of the display image source are recorded as (center field of view, image height). In this embodiment, 11 sets of image source parameters of the display image source are taken as an example , the technical effects of the embodiments of the present disclosure are explained from the perspective of field of view dispersion. In this embodiment, the image source parameters of 11 sets of display image sources are taken as an example to illustrate the technical effects of the embodiment of the present disclosure from the perspective of field of view diffuse spots. The image source parameters of the 11 groups of display image sources are recorded 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), IMA(0.000,18.000mm).

As shown in Figure 12, the size of the diffuse spots is the ordinate. It can be seen that under the image source parameters of the 11 groups of display image sources, the size of the diffuse spots is smaller than another diffuse spot size threshold when the matching imaging quality is better ( For example, 100um), therefore, the image quality is good.

Figure 13 is the field curvature and distortion curve of application scenario three. As shown in Figure 13, for field curvature (also called Field Curvature), the ordinate is the size of the field of view, and the abscissa represents the size of the field curvature, and its unit is millimeters; for distortion (also called F-Tan ( Theta)Distortion), its abscissa represents the distortion size (expressed as a percentage), S represents the field curvature in the sagittal direction, and T represents the field curvature in the meridional direction. As shown in Figure 13, the field curvature of the entire field of view is smaller than the field curvature threshold of the entire field of view, such as 0.5mm. Referring again to Figure 13, since the distortion value is located to the left of 0, there is no inflection in the distortion. To this end, it is shown that the solution of the embodiment of the present disclosure corrects the field curvature well, and the distortion changes linearly.

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.

Table 13

Table 13 shows the configuration details of each lens. Nd is the refractive index, Vd is Abbe's 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 in order. The surface number S2 , S4, and S6 are the light incident surfaces of the third lens L3, the second lens L2, and the first lens L1 in order.

Table 14

Table 14 shows the parameters of each lens, including the aspheric parameters of each lens, the conic conic coefficients of the lenses, and the correspondence between the coefficients corresponding to each radial coordinate on the radius of curvature.

Table 15

Table 15 shows the diopter of the image source at different positions. Figure 14 is a schematic structural diagram of the optical lens module described in application scenario 4. What is different from Figure 2 above is that the light incident surface of the first lens L1 is flat, and the core thickness of the first lens L1 is increased. The shapes of the first lens L1 and the second lens L2 are also different from those in FIG. 2 .

Table 16

Table 16 shows the stagnation point design data of each lens in the optical lens module, where the "stagnation point position" is the vertical distance from the stagnation point set on the surface of each lens to the main optical axis of the optical module.

Figure 15 is the modulation transfer function diagram of application scenario four; as shown in Figure 15, the abscissa represents the line pairs contained in every millimeter of the imaging surface (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 disclosed solution, the following six image source parameters are configured to determine the modulation transfer function value.

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 ray (Tangential) imaging quality or sagittal ray (Sagittal) imaging quality. The details are as follows:

(1) Image height is 9.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF5;

(2) The image height is 0.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF4;

(3) Image height is 0.00mm, sagittal ray (Sagittal) imaging quality, and its corresponding modulation transfer function is marked MTF4;

(4) The image height is 18.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF3;

(5) The image height is 9.00mm, the tangential ray imaging quality, and the corresponding modulation transfer function is marked MTF2;

(6) The image height is 18.00mm, the sagittal ray imaging quality, and the corresponding modulation transfer function is marked MTF1.

The value of the modulation transfer function is greater than another modulation transfer function value threshold 0.2 that matches better resolution, and therefore has better resolution.

The specific image source parameters selected in Figure 15 above are only examples and are not unique limitations.

Figure 16 is the diffusion pattern of application scenario four; it can be seen from Figure 16 that the image source parameters of the display image source are recorded as (center field of view, image height). In this embodiment, 11 sets of image source parameters of the display image source are taken as an example , the technical effects of the embodiments of the present disclosure are explained from the perspective of field of view dispersion. In this embodiment, the image source parameters of 11 sets of display image sources are taken as an example to illustrate the technical effects of the embodiment of the present disclosure from the perspective of field of view diffuse spots. The image source parameters of the 11 groups of display image sources are recorded 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), IMA(0.000,18.000mm).

As shown in Figure 16, the size of the diffuse spots is the ordinate. It can be seen that under the image source parameters of the 11 groups of display image sources, the size of the diffuse spots is smaller than another diffuse spot size threshold when the matching imaging quality is better ( For example, 100um), therefore, the image quality is good.

Figure 17 is the field curvature and distortion curve of application scenario four. As shown in Figure 17, for field curvature (also called Field Curvature), the ordinate is the size of the field of view, and the abscissa represents the size of the field curvature, and its unit is millimeters; for distortion (also called F-Tan ( Theta)Distortion), its abscissa represents the distortion size (expressed as a percentage), S represents the field curvature in the sagittal direction, and T represents the field curvature in the meridional direction. As shown in Figure 17, the field curvature of the entire field of view is smaller than the field curvature threshold of the entire field of view, such as 0.5mm. Referring again to Figure 17, since the distortion value is located to the left of 0, there is no inflection in the distortion. To this end, it is shown that the solution of the embodiment of the present disclosure corrects the field curvature well, and the distortion changes linearly.

Figure 18 is a schematic diagram of the human eye position and imaging quality in the above application scenario of the present disclosure; the planes where positions A, C, D, E and F are located are parallel to the image plane. As shown in Figure 18, since position B is located on the main optical axis of the optical lens module, the aberration is relatively small. However, when the human eye is located at position A, position C, position D, position E, and position F, the aberration is not On the main optical axis, therefore, when the human eye is at position B, the imaging quality is the best, while large residual aberrations exist at other positions, resulting in poor imaging quality.

Embodiments of the present disclosure also provide a virtual reality device. The virtual reality device may include but is not limited to a VR all-in-one machine, a VR head display, VR glasses, etc., which includes the optical lens module described in any one of the embodiments of the present disclosure. Group.

An embodiment of the present disclosure also provides an interactive system, which includes the virtual reality device provided by any embodiment of the present disclosure.

In the description of the present disclosure, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. 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 an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

The above-mentioned embodiments are only specific implementations of the present disclosure, and are used to illustrate the technical solutions of the present disclosure, but not to limit them. The protection scope of the present disclosure is not limited thereto, although the present disclosure has been described with reference to the foregoing embodiments. Detailed description: Those skilled in the art should understand that any person familiar with the art can still make modifications to the technical solutions recorded in the foregoing embodiments or can easily think of changes within the technical scope disclosed in the present disclosure. Or make equivalent substitutions for some of the technical features; these modifications, changes or substitutions do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims (13)

1. An optical lens module, characterized in that it includes: a display image source, a first lens, a second lens, and a third lens arranged sequentially along the first light propagation direction, wherein:

   The display image source is used to emit circularly polarized light propagating along the first light propagation direction;

   The light incident surface of the first lens is a convex surface or a flat surface, and the exit surface is a convex surface. The circularly polarized light is propagated to the entrance surface and exit surface of the second lens through its light entrance surface and exit surface, so as to transmit all the light to the second lens. The circularly polarized light propagates to the second lens;

   The light incident surface of the second lens is a convex surface and the exit surface is a convex surface to propagate the circularly polarized light to the third lens;

   The light incident surface of the third lens is a concave surface, the exit surface is a plane, and an optical composite film layer is provided on the exit surface. The circularly polarized light is received through the first lens and the second lens, and based on the optical The composite film layer adjusts the polarization state of the circularly polarized light to form the first linearly polarized light propagating along the second propagation direction, and converts the first linearly polarized light into the second circularly polarized light, and then passes through the optical path Folding, converting the second circularly polarized light into a second linearly polarized light to pass through the exit surface of the third lens, the second linearly polarized light propagating along the first light propagation direction for imaging, the The second propagation direction is opposite to the first light propagation direction.
2. The optical lens module according to claim 1, wherein the focal length f1 of the first lens satisfies: 30mm＜f1＜130mm, and the focal length f2 of the second lens satisfies: 50mm＜f2＜100mm. The focal length f3 of the third lens satisfies: -150mm＜f3＜-50mm.
3. The optical lens module according to claim 1, wherein the focal length f1 of the first lens, the focal length f2 of the second lens, and the focal length f3 of the third lens are respectively: f1=46.75mm, f2=70.42mm, f3=-108.99mm; or, f1=51.66mm, f2=73.86mm, f3=-113.93mm; or, f1=123.63mm, f2=62.51mm, f3=-117.79mm, or f1= 38.87mm, f2=69.05mm, f3=-110.71mm.
4. The optical lens module according to claim 1, wherein the thickness CT2 of the second lens on the main optical axis and the side 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 main optical axis satisfy: 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 main optical axis and the air gap D3 between the second lens and the third lens on the main 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, wherein the aspherical surface shape curve of any one of the first lens, the second lens and the third lens is determined according to the following formula:

   

   Among them, z is the sagittal height, c is the curvature corresponding to the radius of curvature, r is the radial length, K is the conic conic coefficient, α ₁ to α ₁₀ respectively represent the coefficients corresponding to each radial coordinate on the radius of curvature; when K When K is less than -1, the surface curve of the lens is a hyperbola. When K is equal to -1, the surface curve of the lens is a parabola. When K is between -1 and 0, the surface curve of the lens is an ellipse. When K is equal to 0, the surface curve of the lens is circular. When the K coefficient is greater than 0, the surface curve of the lens is oblate.
9. The optical lens module according to claim 1, wherein the distance between the exit surface of the third lens and the human eye is not less than 12 mm, and the cone formed between the exit surface of the third lens and the human eye is The shape area shall not be less than 10mm.
10. The optical lens module according to claim 1, wherein the optical lens module has a diopter coverage range of 0D to -7D.
11. The optical lens module according to claim 1, characterized in that the refractive index of the first lens, the second lens and the third lens satisfies: 2.8≤Nd3+Nd2≤3.4, |Nd3-Nd1|≤0.1, |Nd1-Nd2|≤0.2; 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; 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 according to any one of claims 1-12.

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