CN209895071U - Optical lens for virtual reality helmet - Google Patents
Optical lens for virtual reality helmet Download PDFInfo
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- CN209895071U CN209895071U CN201920257156.6U CN201920257156U CN209895071U CN 209895071 U CN209895071 U CN 209895071U CN 201920257156 U CN201920257156 U CN 201920257156U CN 209895071 U CN209895071 U CN 209895071U
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Abstract
The utility model discloses an optical lens for virtual reality helmet, it is three formula lens battery structures, is in proper order for being used for correcting epaxial aberration and off-axis aberration's first piece and second piece lens along the optical axis by thing side to picture side for correct distortion and dispersive third piece lens, optical lens and display screen arrange people's eye the place ahead in proper order. The lens is made of injection molding materials, so that the weight and the cost of the helmet are reduced. The magnification of the optical system is 5 to 7 times, the full field angle is 80 degrees, and the maximum distortion is less than 11%. The smaller magnification satisfies the screen with lower resolution, and the user can obtain good immersion feeling when using the common mobile phone.
Description
Technical Field
The utility model relates to an optical system, in particular to an optical lens for virtual reality.
Background
The Virtual Reality technology (VR) is a visual Virtual environment which is generated by a computer, can be interacted, and has immersion feeling, and is proposed in the 80 th 20 th century, and can generate various Virtual environments as required, and the VR technology is widely applied to the fields of city planning, driving training, indoor design and the like. In recent years, with the continuous improvement of computer computing capability and the development of sensor technology, various types of virtual reality helmets have appeared on the market, and the virtual reality helmets basically consist of a display screen or a mobile phone and a pair of eyepieces, wherein, human eyes can see enlarged images on the display screen through the eyepieces, and the sensors sense the change of human heads to adjust the images in the left display screen and the right display screen, so that the human eyes can see three-dimensional visual images with interactivity.
At present, a single-chip type or two-chip type structure is adopted in most of virtual reality display systems, the single-chip type structure has the defects that the field angle is small, the image quality is not enough to be wanted, and the single-chip type structure and the two-chip type structure can not meet the requirements of a user on the immersion and experience of virtual reality.
Disclosure of Invention
The utility model discloses to the not enough that prior art exists, provide a specific big angle of vision and marginal field of vision like the matter height, can realize the optical lens that is used for the virtual reality helmet that the virtual reality who highly immerses the sense experienced.
The technical solution to achieve the object of the present invention is to provide an optical lens for a virtual reality helmet, which has a three-piece lens set structure, and includes a first lens, a second lens and a third lens in sequence from an object side to an image side along an optical axis; the lens group satisfies the condition: d >9mm, l >17mm, FOV = 80 °, where d is the entrance pupil diameter, l is the exit pupil distance, FOV is the full field angle; 0.6< f/f1<0.8, 1.3< f/f2<1.42, -2.1< f/f3< -1.8, wherein f is the total focal length of the optical lens, and f1, f2 and f3 are the focal lengths of the first lens, the second lens and the third lens in sequence;
the first lens has positive focal power, and both the object side surface (S1) and the image side surface (S2) of the first lens are spherical;
the second lens has positive focal power, and both the object side surface (S3) and the image side surface (S4) of the second lens are aspheric;
the third lens has negative focal power, and at least one of the object side surface (S5) and the image side surface (S6) is aspheric, and the other surface is aspheric or spherical;
the second lens satisfies the condition: the angle of arctan (SAG22/D22) is more than or equal to 38.5 degrees and less than or equal to 40.5 degrees, and the angle of arctan (SAG21/D21) is more than or equal to 38.5 degrees and less than or equal to 40.5 degrees; wherein D22 is the half aperture of the maximum clear aperture of the image side, SAG22 is the rise of the image side at the vertex curvature, D21 is the half aperture of the maximum clear aperture of the object side, and SAG21 is the rise of the object side at the vertex curvature;
the third lens satisfies the condition: arctan (SAG32/D32) is more than or equal to 37.5 degrees and less than or equal to 39.5 degrees, and arctan (SAG31/D31) is more than or equal to 37.5 degrees and less than or equal to 39.5 degrees; d32 is the half aperture of the maximum clear aperture of the image side, SAG32 is the rise of the image side at the maximum half aperture, D31 is the half aperture of the maximum clear aperture of the object side, and SAG31 is the rise of the object side at the maximum half aperture.
The utility model provides an optical lens, it satisfies the condition: T1/T3 is more than or equal to 0.85 and less than or equal to 1, T2/T1 is more than or equal to 0.14 and less than or equal to 0.15, TTL/EFL is more than or equal to 1.2 and less than or equal to 1.5; wherein, T1 is the distance between the object-side surface of the first lens element and the human eye, T2 is the distance between the center of the image-side surface of the second lens element and the center of the object-side surface of the third lens element, T3 is the distance between the center of the image-side surface of the third lens element and the center of the display screen of the optical lens element, TTL is the distance between the center of the object-side surface of the first lens element and the center of the display screen of the optical lens element, and EFL is the total effective focal length of the optical lens element.
The total length of the optical lens is less than or equal to 90 mm.
The utility model provides an optical system has great exit pupil diameter and exit pupil distance, can make the people have very big activity space in the use people's eyes.
Compared with the prior art, the utility model provides an optical lens of three formula battery of lens structures, first piece and second piece lens are used for correcting epaxial aberration and off-axis aberration, and the third piece lens is used for correcting distortion and chromatic dispersion, and optical lens and display screen arrange human eye the place ahead in proper order. Compared with a two-piece structure, the three-piece structure can better correct chromatic aberration to obtain a larger field angle and a larger range of correctable diopter; and compared with a four-piece structure or a five-piece structure, the three-piece structure has smaller distortion, smaller volume and lighter weight. The lens is made of injection molding materials, so that the weight of the helmet is reduced, the manufacturing cost is lower, and the processing difficulty is lower. Therefore, the utility model provides a three formula structure optical lens, the formation of image quality in order to obtain the preferred is revised to the lens that utilizes different focuses, can also reach less distortion under the condition of great visual field, uses it for the virtual reality helmet, can obtain the better image quality of bigger angle of vision, and the image quality of marginal visual field is very high. The utility model provides an optical system's magnification is 5 to 7 times, and the full field angle is 80 degrees, and maximum distortion is less than 11%. The smaller magnification satisfies the screen of lower resolution, and the user can obtain higher sense of immersion.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens provided in embodiment 1 of the present invention;
fig. 2 is a chromatic aberration diagram of an optical lens provided in embodiment 1 of the present invention;
fig. 3 is a curvature of field diagram of an optical lens provided in embodiment 1 of the present invention;
fig. 4 is a distortion diagram of an optical lens system provided in embodiment 1 of the present invention;
fig. 5 is a modulation transfer function diagram of an optical lens according to embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of an optical lens provided in embodiment 2 of the present invention;
fig. 7 is a chromatic aberration diagram of an optical lens provided in embodiment 2 of the present invention;
fig. 8 is a curvature of field diagram of an optical lens system according to embodiment 2 of the present invention;
fig. 9 is a distortion diagram of an optical lens system according to embodiment 2 of the present invention;
fig. 10 is a modulation transfer function diagram of an optical lens according to embodiment 2 of the present invention;
in the figure, 1, a first lens; 2. a second lens; 3. a third lens.
Detailed Description
The technical solution of the present invention will be explained in detail with reference to the accompanying drawings and embodiments. In the description of the specification, numerous specific details are set forth in order to provide a more thorough understanding of the invention; however, the present invention may be practiced without some or all of these specific details.
Example 1
Referring to fig. 1, it is a schematic structural diagram of an optical lens (labeled as OL 1) provided in this embodiment. To show the features of the present embodiment, only the structures related to the present embodiment are shown, and the rest of the structures are omitted. The optical system provided by the embodiment can be a wide-angle eyepiece with a wide-angle level larger than 80 degrees, and can be applied to a virtual reality helmet-mounted display system. The virtual reality helmet display system with the display screen being Iphone 6Plus can be applied. The present embodiment is a fixed focus optical system.
As shown in fig. 1, the optical lens OL1 of the present embodiment mainly includes, in order from an object side to an image side: a piece of first lens 1 having a positive refractive power, a piece of second lens 2 having a positive refractive power, and a piece of third lens 3 having a positive refractive power.
In this embodiment, the display screen is disposed at the image side of the optical lens, the human eye is located at the object side of the optical lens, the distance between the human eye and the first lens element 1 is 20mm, and the center of the human eye and the optical axis may be eccentric by 4mm at most.
In this embodiment, the optical lens is an apple 6P mobile phone screen with a width of 69mm and a length of 122mm or a display screen with the same size and a screen resolution of more than 1300 × 650 pixels.
In the optical lens provided in this embodiment, the front and back surfaces of the second lens element 2 are aspheric surfaces, the front surface of the third lens element 3 is aspheric surface, and the back surface is aspheric surface. The aspheric surface may satisfy the following mathematical formula:
wherein z is the surface rise, r is the vertical distance from the surface vertex to any point on the surface, c is the curvature of the surface vertex, k is the surface conic coefficient, alpha1～α8First to eighth aspheric coefficients, respectively.
Table 1 lists details of the optical lens OL1 according to the present disclosure, including the radius of curvature, thickness, refractive index, abbe number, etc. of each lens, as shown in fig. 1. The surface numbers of the lenses are arranged in order from the object side to the image side, S1 is the surface of the first lens element 1 facing the object side, S2 is the surface of the first lens element 1 facing the image side, similarly, S3 and S5 are the surfaces of the second lens element 2 and the third lens element 3 facing the object side, respectively, and S4 and S6 are the surfaces of the second lens element 2 and the third lens element 3 facing the image side, respectively. In table 1, "thickness" represents the distance between the surface and a surface adjacent to the image side, for example, the "thickness" of the surface S1 is the distance between the surface S1 and the surface S2, and the "thickness" of the surface S2 is the distance between the surface S2 and the surface S3.
TABLE 1
The two surfaces S3 and S4 of the second lens 2 in the present embodiment, and the first surface S5 of the third lens 3 have coefficients of respective terms in aspherical mathematical expressions as shown in table 2.
TABLE 2
| Surface of | Coefficient of cone | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | -0.946 | 1.225E-03 | -3.459E-06 | -6.392E-09 | -7.743E-12 | -1.589E-15 | 1.179E-17 | 2.604E-20 | -2.021E-23 |
| S4 | -7.623 | -8.282E-03 | -7.427E-07 | 1.514E-09 | -1.793E-12 | -4.720E-15 | -3.889E-18 | 4.511E-21 | 3.236E-23 |
| S5 | -2.872 | -5.027E-03 | 8.451E-06 | 6.078E-09 | -1.360E-12 | -5.143E-15 | 3.485E-19 | 1.205E-20 | -7.598E-24 |
Referring to fig. 2, a Vertical axis color difference (Vertical axis color difference) graph of the optical lens provided in this embodiment is shown. The vertical axis chromatic aberration is shown to be less than 32 μm.
Referring to fig. 3, a field curvature (field curvature) graph of the optical lens provided in this embodiment is shown. The tangent field curvature and the sagittal field curvature of the beams with wavelengths of 480nm, 515nm, 546nm and 640nm are well controlled.
Referring to fig. 4, a graph of distortion (distortion) of the optical lens provided in this embodiment is shown. The distortion rates of the light beams with wavelengths of 486nm, 588nm and 656nm are shown to be controlled within (-11%, + 11%).
Referring to fig. 5, it is a FFT MTF graph of the optical lens provided in this embodiment. The graphs show that the FFT MTF of the light beam at each field angle is above 0.2 at 10 line pairs/mm, and is controlled in a good range.
Example 2
Referring to fig. 6, it is a schematic structural diagram of an optical lens (labeled as OL 2) provided in this embodiment. To show the features of the present embodiment, only the structures related to the present embodiment are shown, and the rest of the structures are omitted. The optical lens provided by the embodiment can be a wide-angle eyepiece with a wide-angle level larger than 80 degrees, can be applied to a virtual reality helmet display system, and is suitable for the virtual reality helmet display system with a Sumsung Galaxy Note9 display screen. The present embodiment provides a certain focus optical system. The optical lens OL2 mainly includes, in order from an object side to an image side: a first lens 1 with positive diopter, a second lens 2 with positive diopter, and a third lens 3 with positive diopter. In this embodiment, the display screen is disposed at the image side of the optical lens, the human eye is located at the object side of the optical lens, the distance between the human eye and the first lens element 1 of the optical lens is 20mm, and the maximum center of the human eye can be 4mm eccentric from the optical axis.
The display screen corresponding to the optical lens OL2 provided in this embodiment is a Sumsung Galaxy Note9 mobile phone screen with a width of 76.4mm and a length of 161.9mm or a display screen with the same size and a screen resolution greater than 1300 × 650 pixels.
The front and rear surfaces of the second lens 2 of the optical lens OL2 are aspheric, and the front surface and the rear surface of the third lens 3 are aspheric. The aspheric surface may satisfy the following mathematical formula:
wherein z is the surface rise, r is the vertical distance from the surface vertex to any point on the surface, c is the curvature of the surface vertex, k is the surface conic coefficient, alpha1α8First to eighth aspheric coefficients, respectively.
Table 3 lists details of embodiments of optical lens OL2 according to the present disclosure, including radius of curvature, thickness, refractive index, abbe number, etc. of each lens, as shown in fig. 2. The surface numbers of the lenses are sequentially arranged from the object side to the image side, S1 is the surface of the first lens element 1 facing the object side, S2 is the surface of the first lens element 1 facing the image side, similarly, S3 and S5 are the surfaces of the second lens element 2 and the third lens element 3 facing the object side, respectively, and S4 and S6 are the surfaces of the second lens element 2 and the third lens element 3 facing the image side, respectively. The "thickness" represents the distance between the surface and a surface adjacent to the image side, for example, the "thickness" of the surface S1 is the distance between the surface S1 and the surface S2, and the "thickness" of the surface S2 is the distance between the surface S2 and the surface S3.
TABLE 3
The coefficients of the aspherical surface of the two surfaces S3 and S4 of the second lens 2 and the first surface S5 of the third lens 3 in the present embodiment are shown in table 4.
TABLE 4
| Surface of | Coefficient of cone | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | -1.949 | 2.649-E03 | -3.266E-06 | -8.763E-10 | 3.981E-13 | 1.378E-15 | 7.137E-19 | 7.304E-22 | -4.750E-25 |
| S4 | -6.135 | -9.667E-03 | -3.875E-06 | 4.957E-10 | -4.179E-13 | 1.658E-16 | 1.385E-18 | 6.019E-22 | 1.141E-24 |
| S5 | -4.525 | -4.862E-03 | 6.255E-06 | 3.735E-09 | -4.061E-13 | -2.339E-15 | -9.325E-19 | 1.461E-21 | 6.127E-25 |
Referring to fig. 7, a Vertical axis color difference (Vertical axis color difference) graph of the optical lens OL2 provided in this embodiment is shown. The vertical axis chromatic aberration is shown to be less than 40 μm.
Referring to fig. 8, a field curvature (field curvature) graph of the optical lens OL2 provided for the present embodiment. The tangent and sagittal curvature values of beams with wavelengths of 486nm, 588nm and 656nm are well controlled.
Referring to fig. 9, a distortion (distortion) graph of the optical lens OL2 is provided for the present embodiment. The distortion rates of the light beams with wavelengths of 486nm, 588nm and 656nm are shown to be controlled within (-11%, + 11%).
Referring to fig. 10, an FFT MTF graph of the optical lens OL2 provided for the present embodiment. The graphs show that the FFT MTF of the light beam at each field angle is more than 0.3 at 10 line pairs/mm, and the FFT MTF is controlled in a good range.
Claims (3)
1. An optical lens for a virtual reality helmet, characterized by: the lens is of a three-piece lens group structure, and a first lens (1), a second lens (2) and a third lens (3) are arranged in sequence from an object side to an image side along an optical axis; the lens group satisfies the condition: d >9mm, l >17mm, FOV = 80 °, where d is the entrance pupil diameter, l is the exit pupil distance, FOV is the full field angle; 0.6< f/f1<0.8, 1.3< f/f2<1.42, -2.1< f/f3< -1.8, wherein f is the total focal length of the optical lens, and f1, f2 and f3 are the focal lengths of the first lens, the second lens and the third lens in sequence;
the first lens has positive focal power, and both the object side surface (S1) and the image side surface (S2) of the first lens are spherical;
the second lens has positive focal power, and both the object side surface (S3) and the image side surface (S4) of the second lens are aspheric;
the third lens has negative focal power, and at least one of the object side surface (S5) and the image side surface (S6) is aspheric, and the other surface is aspheric or spherical;
the second lens satisfies the condition: the angle of arctan (SAG22/D22) is more than or equal to 38.5 degrees and less than or equal to 40.5 degrees, and the angle of arctan (SAG21/D21) is more than or equal to 38.5 degrees and less than or equal to 40.5 degrees; wherein D22 is the half aperture of the maximum clear aperture of the image side, SAG22 is the rise of the image side at the vertex curvature, D21 is the half aperture of the maximum clear aperture of the object side, and SAG21 is the rise of the object side at the vertex curvature;
the third lens satisfies the condition: arctan (SAG32/D32) is more than or equal to 37.5 degrees and less than or equal to 39.5 degrees, and arctan (SAG31/D31) is more than or equal to 37.5 degrees and less than or equal to 39.5 degrees; d32 is the half aperture of the maximum clear aperture of the image side, SAG32 is the rise of the image side at the maximum half aperture, D31 is the half aperture of the maximum clear aperture of the object side, and SAG31 is the rise of the object side at the maximum half aperture.
2. An optical lens for a virtual reality headset according to claim 1, wherein: it satisfies the conditions: T1/T3 is more than or equal to 0.85 and less than or equal to 1, T2/T1 is more than or equal to 0.14 and less than or equal to 0.15, TTL/EFL is more than or equal to 1.2 and less than or equal to 1.5; wherein, T1 is the distance between the object-side surface of the first lens element and the human eye, T2 is the distance between the center of the image-side surface of the second lens element and the center of the object-side surface of the third lens element, T3 is the distance between the center of the image-side surface of the third lens element and the center of the display screen of the optical lens element, TTL is the distance between the center of the object-side surface of the first lens element and the center of the display screen of the optical lens element, and EFL is the total effective focal length of the optical lens element.
3. An optical lens for a virtual reality headset according to claim 1, wherein: its total length is less than or equal to 90 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920257156.6U CN209895071U (en) | 2019-02-28 | 2019-02-28 | Optical lens for virtual reality helmet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920257156.6U CN209895071U (en) | 2019-02-28 | 2019-02-28 | Optical lens for virtual reality helmet |
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| CN209895071U true CN209895071U (en) | 2020-01-03 |
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| CN201920257156.6U Active CN209895071U (en) | 2019-02-28 | 2019-02-28 | Optical lens for virtual reality helmet |
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| CN (1) | CN209895071U (en) |
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