CN218848432U

CN218848432U - Optical lens structure and virtual reality glasses

Info

Publication number: CN218848432U
Application number: CN202222467017.0U
Authority: CN
Inventors: 贾春辉; 杨福臻
Original assignee: Nolo Co ltd
Current assignee: Nolo Co ltd
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2023-04-11
Anticipated expiration: 2032-09-16

Abstract

The utility model provides an optical lens structure, virtual reality glasses. In the optical lens structure, the display image source is used for emitting circularly polarized light rays propagating along the first light ray propagation direction; the first lens transmits the circularly polarized light to the incident surface and the emergent surface of the second lens so as to transmit the circularly polarized light to the second lens; the second lens transmits circularly polarized light to the third lens, the third lens receives the circularly polarized light through the first lens and the second lens, optical processing is carried out on the circularly polarized light to obtain first linearly polarized light transmitted along a second transmission direction, optical processing is carried out on the first linearly polarized light to obtain second linearly polarized light to penetrate through an emergent face of the third lens, the second linearly polarized light is transmitted along the first light transmission direction to carry out imaging, a good imaging effect is guaranteed, meanwhile, the total optical length is small, and the size and the weight are reduced.

Description

Optical lens structure and virtual reality glasses

Technical Field

The utility model relates to an electronic equipment field, concretely relates to optical lens structure, virtual reality glasses.

Background

In the virtual reality technology, image information is presented based on an optical lens structure, and the image information is combined with various output devices through electric signals generated by computer technology, so that the image information is converted into objects which can be felt by people, and the objects can be similar to real objects or virtual objects.

At present, the existing optical lens structure is a fresnel lens group or a hyperboloid multi-lens group, and the imaging effect is poor, the volume is large and the weight is heavy.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an optical lens structure, virtual reality glasses to overcome or alleviate above-mentioned problem.

The utility model discloses a technical scheme do:

an optical lens structure, comprising: display image source, first lens, second lens, the third lens that sets gradually along first light propagation direction, wherein:

the display image source is used for emitting circularly polarized light rays propagating along a first light propagation direction;

the light incident surface and the emergent surface of the first lens are convex surfaces, and the circularly polarized light is transmitted to the incident surface and the emergent surface of the second lens through the light incident surface and the emergent surface of the first lens so as to be transmitted to the second lens;

the light incident surface of the second lens is a concave surface, and the emergent surface of the second lens is a plane so as to transmit the circularly polarized light to the third lens;

the light incoming surface of the third lens is a plane, the emergent surface of the third lens is a convex surface and is used for receiving the circularly polarized light through the first lens and the second lens, the circularly polarized light is subjected to optical processing to obtain first linearly polarized light propagating along a second propagation direction, the first linearly polarized light is subjected to optical processing to obtain second linearly polarized light to penetrate through the emergent surface of the third lens, the second linearly polarized light propagates along the first light propagation direction to form images, and the second propagation direction is opposite to the first light propagation direction.

Virtual reality glasses comprising an optical lens structure according to any one of the embodiments of the present disclosure.

In the technical scheme provided by the embodiment of the disclosure, the first lens and the second lens receive the circularly polarized light, the circularly polarized light is optically processed to obtain first linearly polarized light propagating along a second propagation direction, and the first linearly polarized light is optically processed to obtain second linearly polarized light to pass through the emergent surface of the third lens, so that the circularly polarized light is optically processed, residual aberration is corrected, the imaging resolution ratio is high, a good imaging effect is ensured, the total optical length of the whole optical lens structure is small, and the volume and the weight of the optical lens structure are greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of an optical lens structure according to an embodiment of the disclosure;

FIG. 2 is a schematic diagram illustrating a position change of a first lens L1 in an optical lens structure;

FIG. 3 is a diagram of a modulation transfer function for application scenario one;

FIG. 4 is a diffuse speckle map of application scene one;

FIG. 5 is a graph of field curvature and distortion for application scenario one;

FIG. 6 is a diagram of a modulation transfer function for application scenario two;

FIG. 7 is a speckle pattern of application scenario two;

FIG. 8 is a graph of curvature of field and distortion for application scenario two;

FIG. 9 is a diagram of the modulation transfer function for application scenario three;

FIG. 10 is a diffuse speckle pattern of application scene three;

FIG. 11 is a graph of curvature of field and distortion for application scenario three;

FIG. 12 is a schematic diagram illustrating the position of the human eye and the imaging quality in the application scenario of the present disclosure;

Detailed Description

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

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. 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.

Fig. 1 is a schematic structural diagram of an optical lens structure according to an embodiment of the disclosure; as shown in fig. 1, the optical lens structure includes: display image source IMA, first lens L1, second lens L2, third lens L3 that set gradually along first light propagation direction, wherein: the display image source IMA is used for emitting circularly polarized light rays propagating along a first light propagation direction; the light incident surface and the light exit surface of the first lens L1 are convex, and the circularly polarized light is transmitted to the light incident surface and the light exit surface of the second lens L2 through the light incident surface and the light exit surface of the first lens L1, so that the circularly polarized light is transmitted to the second lens L2; the light incident surface of the second lens L2 is a concave surface, and the emergent surface is a plane so as to transmit the circularly polarized light to the third lens; the light incoming surface of the third lens L3 is a plane, the emergent surface of the third lens L3 is a convex surface, and the light incoming surface is used for receiving the circularly polarized light through the first lens and the second lens, carrying out optical processing on the circularly polarized light to obtain first linearly polarized light propagating along a second propagation direction, carrying out optical processing on the first linearly polarized light to obtain second linearly polarized light to penetrate through the emergent surface of the third lens, and the second linearly polarized light propagates along the first light propagation direction to form an image, wherein the second propagation direction is opposite to the first light propagation direction.

Optionally, the third lens L3 adjusts a polarization state of the circularly polarized light to form the first linearly polarized light propagating along a second propagation direction, and converts the first linearly polarized light into a second circularly polarized light, and then converts the second circularly polarized light into the second linearly polarized light by folding the optical path.

Optionally, an optical film layer is disposed on the light incident surface of the third lens L3, and is configured to adjust a polarization state of the circularly polarized light to form a first linearly polarized light propagating along a second propagation direction, convert the first linearly polarized light into a second circularly polarized light, and convert the second circularly polarized light into a second linearly polarized light through folding of a light path to pass through the exit surface of the third lens.

The light path from the display image source to the third lens L3 is as shown in fig. 1, and finally the second linearly polarized light is formed to propagate along the first light propagation direction and to enter the human eye through the third lens.

In this embodiment, the circularly polarized light is received by the first lens and the second lens, the circularly polarized light is optically processed to obtain first linearly polarized light propagating along a second propagation direction, and the first linearly polarized light is optically processed to obtain second linearly polarized light to pass through the exit surface of the third lens, so that the optically processing of the circularly polarized light is realized, the residual aberration is corrected, the imaging resolution is high, the good imaging effect is ensured, the total optical length of the whole optical lens structure is small, and the volume and the weight of the optical lens structure are greatly reduced.

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

Further, the focal length f1 of the first lens L1 satisfies: f1 is more than 60mm and less than 120mm, and the focal length f2 of the second lens L2 satisfies: -180mm < f2 < -130mm, the focal length f3 of the third lens L3 satisfying: 80mm < f3 < 150mm, such that the first lens L1 has positive power to compress the volume of circularly polarized light incident to the first lens; in addition, the second lens L2 has negative focal power, and compresses the optical total length of the optical lens system together with the first lens L1, so that the optical total length of the whole optical lens structure is ensured to be smaller, meanwhile, the volume and the weight of the optical lens structure are smaller, and the light and thin of the optical lens structure are ensured; the negative focal power of the second lens L2 is matched with the positive angle of the first lens, so that the residual aberration is corrected, the high resolution of imaging is realized, and a good imaging effect is ensured. The third lens L3 has positive focal power, and thus can converge the light beam emitted from the third lens, ensuring a good imaging effect.

When the optical lens structure is applied to virtual reality glasses, integral focusing can be achieved by adjusting the distance between the display image source IMA and each lens; and the relative position of the first lens L1 relative to the second lens L2 and the third lens L3 is further adjusted, so that internal focusing is realized, and the user who can conveniently take the glasses for the myopic eye can wear the glasses.

In addition, since the light incident surface of the first lens L1 is a convex surface and the light emitting surface is a convex surface, positive focal power can be realized to compress the circularly polarized light and then transmit the circularly polarized light to the second lens L2. The light incident surface of the second lens L2 is a concave surface, and the emergent surface is a plane surface, so that the negative focal power of the second lens L2 is realized, and the compressed circularly polarized light is diffused and transmitted to the light incident surface of the third lens L3. The income plain noodles of third lens L3 is the plane, and the exit surface is the convex surface, has realized the positive focal power of third lens L3, makes to the light beam of third lens outgoing plays to converge, in addition, the rethread optics rete that sets up on the income plain noodles of third lens L3 has realized the polarization state adjustment of circular polarization ray and the folding of light path guarantee good image effect.

Further, the focal lengths of the respective lenses of the optical lens structure may satisfy, in addition to the above relationship, a focal length f1 of the first lens L1 that satisfies: 3F < | F1| < 4F; the focal length f2 of the second lens L2 satisfies: 6F < | F2| < 7F; a focal length f3 of the third lens L3 satisfies: 4F < | F3| < 6F, and F represents the system focal length of the optical lens structure, so that the optical lens structure is light and thin, and a good imaging effect is ensured.

Optionally, the total optical length TTL of the optical lens structure and the system focal length F of the optical lens structure satisfy: TTL/F is more than or equal to 0.5 and less than or equal to 1.5, so that the thickness of the optical lens structure and the total optical length of the whole optical lens structure can be reduced.

Optionally, the thickness CT1 of the first lens element on the main optical axis and the total optical length TTL of the optical lens structure satisfy: CT1/TTL is more than or equal to 0.3 and less than or equal to 0.5, so that the light path folding is effectively realized, and the total optical length of the optical lens structure is reduced.

Optionally, the thickness CT2 of the second lens element L2 on the main optical axis and the total optical length TTL of the optical lens structure satisfy: CT2/TTL is more than or equal to 0.05 and less than or equal to 0.1, so that the optical path of the optical lens structure is reduced, and the circularly polarized light emitted from the second lens is diffused to the third lens L3 at a smaller angle.

Optionally, the thickness CT3 of the third lens element L3 on the main optical axis and the total optical length TTL of the optical lens structure satisfy: CT3/TTL is more than or equal to 0.2 and less than or equal to 0.4, so that the total length of the optical lens structure is compressed, and the thickness of the optical lens structure is reduced.

Optionally, a surface shape curve of an aspheric surface of any one of the first lens L1, the second lens L2, and the third lens L3 is determined according to the following formula:

wherein z is rise, c is curvature corresponding to curvature radius, r is radial length, K is conic coefficient, alpha ₁ To alpha ₁₀ Respectively representing coefficients corresponding to radial coordinates on the curvature radius; when K is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when K is equal to-1, the surface-shaped 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 a circle, and when the K coefficient is more than 0, the surface curve of the lens is an oblate circle.

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

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 tapered region formed between the exit surface of the third lens L3 and the human eye is not less than 10mm, so that the optimal imaging position can be formed by processing the image source through the optical lens structure, the experience of the user can be enhanced, and the optimal imaging position can be adjusted by the user quickly.

Optionally, the diopter coverage range of the optical lens structure is 0D to-7D, so that the optical lens structure is ensured to have good screen definition performance, and the use requirements of most users can be met.

Alternatively, diopter adjustment can be quickly achieved by moving the first lens L1.

Optionally, the field angle FOV of the optical lens structure satisfies: the FOV is more than or equal to 90 degrees and less than or equal to 105 degrees, thereby reducing vertigo feeling and improving immersion feeling.

Optionally, the refractive indexes of the first lens L1, the second lens L2, and the third lens L3 satisfy: nd3+ Nd2 is more than or equal to 3.0 and less than or equal to 3.4, | Nd3-Nd1| is more than or equal to 0.2, and | Nd1-Nd2| is more than or equal to 0.2; nd1 is a refractive index of the first lens L1, nd2 is a refractive index of the second lens L2, and Nd3 is a refractive index of the third lens L3.

Further, abbe numbers of the first lens L1, the second lens L2, and the third lens L3 satisfy: 170 is less than or equal to Vd3+ Vd2 is less than or equal to 90, | Vd3-Vd1| is less than or equal to 10, | Vd1-Vd2| is less than or equal to 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 ratio of the propagation speed of light in vacuum to the propagation speed of light in the lens is expressed by the refractive index, the abbe number (also called abbe number) is used to measure the imaging quality of the lens, and generally, the abbe number is inversely proportional to the refractive index of the lens, and the higher the refractive index, the stronger the ability of incident light to be refracted. When the refractive index of the lens is larger, the Abbe number is smaller, the dispersion is more obvious, and the imaging quality is poorer, and conversely, the imaging quality is better. Therefore, in the present embodiment, correction of aberration can be achieved by the refractive index and abbe number of each lens set as described above, thereby ensuring high resolution of imaging.

Optionally, in an embodiment, the light incident surface of the first lens L1 is further plated with a semi-transparent and semi-reflective film, so as to cooperate with the optical film layer, adjust a polarization state of the circularly polarized light to form a first linearly polarized light propagating along a second propagation direction, convert the first linearly polarized light into a second circularly polarized light, and convert the second circularly polarized light into the second linearly polarized light by folding the optical path.

Optionally, optics rete includes first rete, second rete, third rete and the fourth rete that sets gradually along first light propagation direction, first rete is used for right circular polarization light carries out the antireflection processing in order to avoid a large amount of reflections of circular polarization light, has effectively improved the whole transmissivity of system, increases image contrast. The second film layer is used for adjusting the polarization state of the circularly polarized light to generate first linearly polarized light which is transmitted along a second transmission direction, the transmission direction of the first linearly polarized light is perpendicular to the transmission axis direction of the third film layer, so that the third film layer is used for reflecting the first linearly polarized light to enable the first linearly polarized light to be processed by the second film layer, the polarization state is adjusted again to generate second circularly polarized light, the second circularly polarized light enters the second lens L2 and the first lens L1 in sequence, is reflected through the semi-transparent semi-reflective film plated on the light incoming surface of the first lens L1 to complete the folding of the light path, is emitted from the emergent surface of the first lens L1, is emitted into the second lens L2, is processed through the first film layer and the second film layer on the light incoming surface of the third lens L3 in sequence to enable the second circularly polarized light to be converted into the second linearly polarized light, the transmission 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 emergent surface of the third lens L3, the fourth film layer is used for reinforcing the third film layer, the polarization state cannot be changed, and the second linearly polarized light is transmitted along the transmission direction, and the first linearly polarized light is transmitted into the image of the second linearly polarized light which is transmitted in the direction, and the first linearly polarized light is opposite to be transmitted into the second linearly polarized light.

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

Based on the above description of the embodiments of the present disclosure, the following exemplary description of the configuration of each lens is provided in conjunction with the requirements of a specific application scenario.

Application scenario (one): f1=79.53mm, f2= -155.32mm, f3=109.08mm, ttl = 19.72mm.

TABLE 1

Table 1 shows arrangement details of the respective lenses, nd is a refractive index, vd is an abbe number, surface numbers S1, S3, and S5 are exit surfaces of the third lens L3, the second lens L2, and the first lens L1 in this order, and surface numbers S2, S4, and S6 are entrance surfaces of the third lens L3, the second lens L2, and the first lens L1 in this order.

TABLE 2

Table 2 shows the parameters of each lens, including the correspondence between the aspheric parameters of each lens, the conic section coefficients of the lens, and the coefficients corresponding to each radial coordinate on the curvature radius.

TABLE 3

Table 3 shows diopters of the first lens L1 at different positions, and a schematic diagram of a change of the position of the first lens L1 in the optical lens structure is shown in fig. 2.

FIG. 3 is a diagram of a modulation transfer function for application scenario one; as shown in fig. 3, the abscissa represents a line pair (Spatial Frequency in cycles per mm) contained per millimeter on the image plane, and the ordinate represents a Modulation Transfer Function (MTF) value. To preliminarily verify the effectiveness of the disclosed scheme, the following six image source parameters were configured to determine the modulation transfer function values.

In the six image source parameters, each image source parameter includes image height of a display image source, and whether imaging quality is meridional ray (tagential) imaging quality or Sagittal ray (Sagittal) imaging quality, which is specifically as follows:

(1) The image height is 0.00mm, the imaging quality of the meridian ray (Tangential), and the corresponding modulation transfer function is marked as MTF5;

(2) The image height is 0.00mm, the imaging quality of Sagittal light (Sagittal) is high, and the corresponding modulation transfer function is marked as MTF5;

(3) The image height is 8.58mm, the imaging quality of the meridian light (Tangential) is high, and the corresponding modulation transfer function is marked as MTF4;

(4) The image height is 8.58mm, the imaging quality of Sagittal ray (Sagittal) is high, and the corresponding modulation transfer function is marked as MTF3;

(5) Image height of 17.25mm, meridional ray (changemental) imaging quality, its corresponding modulation transfer function is labeled MTF2;

(6) The image height is 17.25mm, the imaging quality of Sagittal light (Sagittal) is high, and the corresponding modulation transfer function is marked as MTF1;

referring to fig. 3, all modulation transfer function values are greater than the modulation transfer function value threshold of 0.4 matching better resolution and, therefore, have better resolution.

The specific image source parameters selected in fig. 3 are merely examples and are not meant to be limiting.

FIG. 4 is a diffuse speckle pattern of application scene three; as can be seen from fig. 4, the image source parameters of the display image source are recorded as (central field of view, image height), and the technical effects of the embodiments of the present disclosure are described from the viewpoint of the diffuse spot of the field of view, taking the image source parameters of 8 groups of display image sources as an example in this embodiment. The image source parameters of the 8 groups of display image sources are respectively recorded as IMA (0.000,0.000mm), IMA (0.000,1.5mm), IMA (0.000,3.430mm), IMA (0.000,5.146mm), IMA (0.000,6.861mm), IMA (0.000,8.576mm), IMA (0.000,10.291mm), IMA (0.000,12.006mm), IMA (0.000,13.722mm), IMA (0.000,15.437mm) and IMA (0.000,17.250mm).

As shown in fig. 4, the size of the diffuse spot is the ordinate, and therefore, under 8 sets of image source parameters of the display image source, the size of the diffuse spot is smaller than the threshold value (for example, 50 um) of the size of the diffuse spot when the matching imaging quality is good, and therefore, the imaging quality is good.

Fig. 5 is a graph of field curvature and distortion for application scenario one. As shown in fig. 5, for Field Curvature (also referred to as Field Curvature), the ordinate is the Field size, and the abscissa indicates the Field Curvature size in Millimeters (Millimeters); for Distortion (also known as F-Tan (Theta) Distortion), the abscissa indicates the magnitude of the Distortion (expressed in Percent), S indicates the field curvature in the sagittal direction, and T indicates the field curvature in the meridional direction. As shown in fig. 5, the full field of view curvature is less than a full field of view curvature threshold, such as 0.5mm. Referring again to fig. 5, since the distortion value is located on the left side of 0, the distortion is not recurved. For this reason, the scheme of the embodiment of the present disclosure is shown to correct the curvature of field well, and the distortion shows linear change.

Application scenario (b): f1=85.67mm, f2= -167.45mm, f3=122.17mm, ttl =18.92mm.

TABLE 4

Table 4 shows arrangement details of the respective lenses, nd is a refractive index, vd is an abbe number, surface numbers S1, S3, and S5 are light exit surfaces of the third lens L3, the second lens L2, and the first lens L1 in this order, and surface numbers S2, S4, and S6 are light entrance surfaces of the third lens L3, the second lens L2, and the first lens L1 in this order.

TABLE 5

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

Table 5 shows the parameters of each lens, including the corresponding relationship between the aspheric parameters of each lens, the conic coefficients of the lens, and the coefficients corresponding to each radial coordinate on the curvature radius.

TABLE 6

Table 6 shows the diopters of the first lens L1 at different positions.

FIG. 6 is a diagram of a modulation transfer function for application scenario two; as shown in fig. 6, the abscissa represents a line pair (Spatial Frequency in cycles per mm) contained per millimeter on the image plane, and the ordinate represents a Modulation Transfer Function (MTF) value. To preliminarily verify the effectiveness of the disclosed scheme, the following six image source parameters were configured to determine the modulation transfer function values.

In the six image source parameters, each image source parameter includes image height of a display image source, and whether imaging quality is meridional light ray (tagential) imaging quality or Sagittal light ray (Sagittal) imaging quality, which is specifically as follows:

(1) Image height of 8.58mm, meridional ray (changemental) imaging quality, its corresponding modulation transfer function is labeled MTF5;

(2) Image height is 17.25mm, meridian ray (changemental) imaging quality, its corresponding modulation transfer function is marked as MTF4;

(3) The image height is 17.25mm, the imaging quality of Sagittal ray (Sagittal), and the corresponding modulation transfer function is marked as MTF3;

(4) The image height is 0.00mm, the imaging quality of the meridian ray (Tangential), and the corresponding modulation transfer function is marked as MTF2;

(5) The image height is 0.00mm, the imaging quality of Sagittal light (Sagittal) is high, and the corresponding modulation transfer function is marked as MTF2;

(6) The image height is 8.58mm, the imaging quality of Sagittal ray (Sagittal) is high, and the corresponding modulation transfer function is marked as MTF1;

referring to fig. 6, all modulation transfer function values are greater than the modulation transfer function value threshold of 0.4 matching better resolution and therefore have better resolution.

The specific image source parameters selected in fig. 6 are merely examples and are not meant to be limiting.

FIG. 7 is a speckle pattern of application scenario two; as can be seen from fig. 7, the image source parameters of the display image source are recorded as (central field of view, image height), and the technical effects of the embodiments of the present disclosure are described from the viewpoint of the diffuse spot of the field of view, taking the image source parameters of 8 groups of display image sources as an example in this embodiment. The image source parameters of the 8 groups of display image sources are respectively 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), IMA (0.000,19.150mm).

As shown in fig. 7, the size of the diffuse spot is an ordinate, and thus, under 8 sets of image source parameters of the display image source, the size of the diffuse spot is smaller than the threshold (for example, 50 um) of the diffuse spot size when the matching imaging quality is good, and therefore, the imaging quality is good. Fig. 8 is a graph of curvature of field and distortion for application scenario two. As shown in fig. 8, for Field Curvature (also referred to as Field Curvature), the ordinate is the Field size, and the abscissa indicates the Field Curvature size in Millimeters (Millimeters); for Distortion (also known as F-Tan (Theta) Distortion), the abscissa indicates the magnitude of the Distortion (expressed in Percent), S indicates the field curvature in the sagittal direction, and T indicates the field curvature in the meridional direction. As shown in fig. 8, the full field of view curvature is less than a full field of view curvature threshold, such as 0.5mm. Referring again to fig. 8, since the distortion value is located on the left side of 0, the distortion is not recurved. For this reason, it is shown that the field curvature of the solution of the embodiment of the present disclosure is well corrected, and the distortion shows linear change.

Application scenario (c): f1=85.66mm, f2= -159.45mm, f3= -102.76mm, ttl =19.98mm.

TABLE 7

Table 7 shows arrangement details of the respective lenses, nd is a refractive index, vd is an abbe number, surface numbers S1, S3, and S5 are light exit surfaces of the third lens L3, the second lens L2, and the first lens L1 in this order, and surface numbers S2, S4, and S6 are light entrance surfaces of the third lens L3, the second lens L2, and the first lens L1 in this order.

TABLE 8

Table 8 shows parameters of each lens, including a correspondence relationship between aspherical surface parameters of each lens, conic coefficients of the lens, and coefficients corresponding to radial coordinates on the radius of curvature.

TABLE 9

Table 9 shows the diopters of the first lens L1 at different positions.

FIG. 9 is a diagram of the modulation transfer function for application scenario three; as shown in fig. 9, the abscissa represents a line pair (Spatial Frequency in cycles per mm) contained per millimeter on the imaging surface, and the ordinate represents a Modulation Transfer Function (MTF) value. To preliminarily verify the effectiveness of the disclosed scheme, the following six image source parameters were configured to determine the modulation transfer function values.

(1) The image height is 8.58mm, the imaging quality of the meridian light (Tangential) is high, and the corresponding modulation transfer function is marked as MTF5;

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

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

(6) The image height is 17.25mm, the imaging quality of Sagittal ray (Sagittal), and the corresponding modulation transfer function is marked as MTF1;

referring to fig. 9, all modulation transfer function values are greater than the modulation transfer function value threshold of 0.4 matching better resolution and therefore have better resolution.

The specific image source parameters selected in fig. 9 are merely examples and are not meant to be limiting.

FIG. 10 is a speckle pattern of application scenario two; as can be seen from fig. 10, the image source parameters of the display image source are recorded as (central field of view, image height), and the technical effects of the embodiments of the present disclosure are described from the viewpoint of the diffuse spot of the field of view, taking the image source parameters of 8 groups of display image sources as an example in this embodiment. The image source parameters of the 8 groups of display image sources are respectively recorded as IMA (0.000,0.000mm), IMA (0.000,1.5mm), IMA (0.000,3.430mm), IMA (0.000,5.146mm), IMA (0.000,6.861mm), IMA (0.000,8.576mm), IMA (0.000,10.291mm), IMA (0.000,12.006mm), IMA (0.000,13.722mm), IMA (0.000,15.437mm) and IMA (0.000,17.250mm).

As shown in fig. 10, the size of the diffuse spot is the ordinate, and therefore, under 8 sets of image source parameters of the display image source, the size of the diffuse spot is smaller than the threshold (for example, 50 um) of the size of the diffuse spot when the matching imaging quality is good, and therefore, the imaging quality is good.

Fig. 11 is a graph of curvature of field and distortion for application scenario two. As shown in fig. 11, for Field Curvature (also referred to as Field Curvature), the ordinate is the Field size, and the abscissa indicates the Field Curvature size in Millimeters (Millimeters); for Distortion (also known as F-Tan (Theta) Distortion), the abscissa indicates the magnitude of the Distortion (expressed in Percent), S indicates the field curvature in the sagittal direction, and T indicates the field curvature in the meridional direction. As shown in fig. 11, the full field of view curvature is less than the full field of view curvature threshold, such as 0.5mm. Referring again to fig. 11, since the distortion value is located on the left side of 0, the distortion is not recurved. For this reason, it is shown that the field curvature of the solution of the embodiment of the present disclosure is well corrected, and the distortion shows linear change.

FIG. 9 is a schematic diagram of the eye position and the imaging quality in the above application scenario of the present disclosure; and the planes of the position A, the position C, the position D, the position E and the position F are parallel to the image plane. As shown in fig. 9, since the position B is located on the main optical axis of the optical lens structure, the aberration is relatively small, and when the human eye is located at the positions a, C, D, E and F, the aberration is not located on the main optical axis, so that when the human eye is located at the position B, the imaging quality is the best, and when the human eye is located at the other positions, the imaging quality is poor due to the large residual aberration.

The embodiment of the present disclosure further provides a pair of virtual reality glasses, which includes the optical lens structure according to any one of the embodiments of the present disclosure.

The embodiment of the disclosure also provides an interactive system, which comprises the virtual reality glasses of the embodiment of the disclosure.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention 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 embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features, within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An optical lens structure, comprising: display image source, first lens, second lens, the third lens that sets gradually along first light propagation direction, wherein:

2. An optical lens arrangement according to claim 1, characterized in that the focal length f1 of the first lens satisfies: f1 is more than 60mm and less than 120mm, and the focal length f2 of the second lens meets the following requirements: -180mm < f2 < -130mm, the focal length f3 of the third lens satisfying: f3 is more than 80mm and less than 150mm.

3. An optical lens structure according to claim 1, wherein the aspheric surface profile of any one of the first lens, the second lens and the third lens is determined according to the following formula:

wherein z is rise, c is curvature corresponding to curvature radius, r is radial length, K is conic coefficient, and alpha 1 to alpha 10 respectively represent coefficients corresponding to radial coordinates on the curvature radius; when K is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when K is equal to-1, the surface-shaped curve of the lens is a parabola; when K is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when K is equal to 0, the surface-shaped curve of the lens is a circle, and when the K coefficient is more than 0, the surface-shaped curve of the lens is an oblate.

4. An optical lens arrangement according to claim 1, characterized in that the focal length f1 of the first lens L1 satisfies: 3F < | F1| < 4F, F represents the system focal length of the optical lens structure.

5. The optical lens structure of claim 1, wherein the focal length f2 of the second lens L2 satisfies: 6F < | F2| < 7F, F represents the system focal length of the optical lens structure.

6. The optical lens structure of claim 1, wherein the focal length f3 of the third lens L3 satisfies: 4F < | F3| < 6F, F represents the system focal length of the optical lens structure.

7. The optical lens structure of claim 1, wherein the total optical length TTL of the optical lens structure and the system focal length F of the optical lens structure satisfy: TTL/F is more than or equal to 0.5 and less than or equal to 1.5.

8. The optical lens structure of claim 1, wherein a thickness CT2 of the second lens L2 on the main optical axis and a total optical length TTL of the optical lens structure satisfy: CT2/TTL is more than or equal to 0.05 and less than or equal to 0.1.

9. The optical lens structure of claim 1, wherein a thickness CT3 of the third lens element L3 on the main optical axis and a total optical length TTL of the optical lens structure satisfy: CT3/TTL is more than or equal to 0.2 and less than or equal to 0.4.

10. Virtual reality glasses comprising an optical lens arrangement according to any one of claims 1-9.