CN-121978841-A - Virtual reality optical device and system

CN121978841ACN 121978841 ACN121978841 ACN 121978841ACN-121978841-A

Abstract

The invention relates to the technical field of virtual reality, and particularly provides virtual reality optical equipment and a system. The virtual reality optical device comprises a first quarter wave plate, a third lens, a second lens and a first lens which are sequentially arranged, and the system further comprises a second quarter wave plate, a polarization reflecting film and a partial reflecting film, wherein the second quarter wave plate and the polarization reflecting film are arranged on the second lens or the first lens and are both positioned on one side far away from a display screen, the second quarter wave plate is closer to the display screen than the polarization reflecting film, and the partial reflecting film is arranged on one side, close to the display screen, of the third lens. The system comprises the display screen and the optical equipment, and has the advantages of light weight, thinness and wide visual field range.

Inventors

WANG QIULI
HAN NA

Assignees

北京京东方显示技术有限公司
京东方科技集团股份有限公司
北京京东方技术开发有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (18)

1. A virtual reality optical device is characterized by comprising a first quarter wave plate, a third lens, a second lens, a first lens, a second quarter wave plate, a polarization reflecting film and a partial reflecting film, wherein the first quarter wave plate, the third lens, the second lens and the first lens are sequentially arranged, the second quarter wave plate and the polarization reflecting film are arranged on the second lens or the first lens and are both positioned on one side far from a display screen, the second quarter wave plate is closer to the display screen than the polarization reflecting film, and the partial reflecting film is arranged on one side, close to the display screen, of the third lens.
2. The device of claim 1, further comprising an anti-reflective film, wherein the anti-reflective film is positioned on a side of the polarizing reflective film remote from the display screen.
3. The apparatus of claim 1, wherein the slow axis of the first quarter wave plate and the slow axis of the second quarter wave plate are oriented perpendicular to each other, the slow axis of the first quarter wave plate and the polarization direction of the polarizing reflective film are oriented at an angle of 45 °, the slow axis of the second quarter wave plate and the polarization direction of the polarizing reflective film are oriented at an angle of 45 °, and the polarization direction of the polarizing reflective film and the polarization direction of the display after light is emitted are oriented perpendicular to each other.
4. The apparatus of claim 1, wherein the second lens is disposed adjacent to the second lens and the third lens is bonded thereto, and wherein the second quarter wave plate and the polarizing reflective film are disposed on the first lens.
5. The apparatus of claim 4, wherein the first lens has a focal length F 1-1 , the second lens has a focal length F 2-1 , the third lens has a focal length F 3-1 , and the apparatus has a focal length F 1 , satisfying: 3＜f 1-1 /F 1 ＜5,5＜|f 2-1 /F 1 |＜7,0.8＜|f 1-1 /f 2-1 |＜1,20mm＜F 1 ＜40mm; And/or The first lens and the second lens have a spacing D 1-1 , the second lens and the third lens have a spacing D 2-1 , the third lens and the display screen have a spacing D 1 , the requirements of 5mm > D 1-1 ＞0.5mm,0.5＜D 1 /d 1-1 ＜25,d 2-1 = 0, and/or The first lens thickness T 1-1 , the second lens thickness T 2-1 , and the third lens thickness T 3-1 satisfy 0.8< T 1-1 /T 3-1 ＜1.5,3＜T 1-1 /T 2-1 <5.
6. The apparatus of claim 5, wherein the radius of curvature of the surface of the first lens away from the second lens is r 11-1 and the radius of curvature of the surface of the second lens away from the second lens is r 12-1 , the radius of curvature of the surface of the second lens away from the third lens is r 21-1 and the radius of curvature of the surface of the third lens away from the third lens is r 22-1 , the radius of curvature of the surface of the third lens adjacent to the second lens is r 31-1 and the radius of curvature of the surface of the third lens away from the second lens is r 32-1 , and wherein: The r 11-1 surface is the same as the plane ,r 22-1 =r 31-1 ,2.5＜|r 21-1 /r 12-1 |＜3,0.8＜|r 32-1 /r 21-1 |＜1.1,2.5＜|r 21-1 /r 22-1 |＜3,r 21-1 and the r 32-1 , the r 32-1 and the r 31-1 have opposite optical power, and/or The refractive indexes of the first lens, the second lens and the third lens are respectively n 1-1 、n 2-1 、n 3-1 , and 1.5< n 1-1 、1.6＜n 2-1 ＜1.7、n 3-1 <1.6 is satisfied.
7. The apparatus of claim 1, wherein the first lens has a focal length F 1-2 , the second lens has a focal length F 2-2 , the third lens has a focal length F 3-2 , the system as a whole has a focal length F 2 , 1.5< |f 1-2 /F 2-2 |＜3,0.9＜|f 2-2 /f 3-2 | <1.1 or F 2-2 /f 3-2 ＞2,5＜|f 3-2 /F 2 | <9, and/or The interval of the first lens and the second lens is D 1-2 , the interval of the second lens and the third lens is D 2-2 , the interval of the third lens and the display screen is D 2 , and the following conditions are satisfied: , And/or The first lens thickness T 1-2 , the second lens thickness T 2-2 , and the third lens thickness T 3-2 satisfy: , 。
8. The apparatus of claim 7, wherein the radius of curvature of the surface of the first lens away from the second lens is r 11-2 , the radius of curvature of the surface of the second lens away from the third lens is r 12-2 , the radius of curvature of the surface of the second lens away from the third lens is r 21-2 , the radius of curvature of the surface of the third lens away from the third lens is r 22-2 , the radius of curvature of the surface of the third lens adjacent to the second lens is r 31-2 , the radius of curvature of the surface of the third lens away from the second lens is r 32-2 , and the following: The r 11-2 surface is the same as the plane ,r 22 =r 31 ,1＜|r 21-2 /r 12-2 |＜1.5,2＜|r 32-2 /r 21-2 |＜3,1＜|r 21-2 /r 22-2 |＜2,r 21-2 and the r 32-2 , the r 32-2 and the r 31-2 have the same optical power, and/or The refractive indexes of the first lens, the second lens and the third lens are n 1-2 、n 2-2 、n 3-2 respectively, and the following conditions are satisfied: , 。
9. The apparatus of claim 1, wherein the second lens is spaced apart from the third lens and the first lens is spaced apart from the second lens.
10. The apparatus of claim 9, wherein the first lens has a focal length F 1-3 , the second lens has a focal length F 2-3 , the third lens has a focal length F 3-3 , and the system as a whole has a focal length F 3 , satisfying: 3< |f 1-3 /F 3 | <6 and 0.4< |f 2-3 /f 3-3 | <1.1 or f 2-3 /f 3-3 >2 and 5< |f 3-3 /F 3 | <9, and/or The distance between the first lens and the second lens is D 1-3 , the distance between the second lens and the third lens is D 2-3 , the distance between the third lens and the display screen is D 3 , and ：2.5＜D 3 /d 1-3 ＜25,5mm＞d 2-3 ＞1.0mm,5mm＞d 1-3 ＞1.0mm,0.5＜d 1-3 /d 2-3 ＜2; and/or the distance between the third lens and the display screen are satisfied The first lens thickness T 1-3 , the second lens thickness T 2-3 , and the third lens thickness T 3-3 satisfy: , 。
11. The apparatus of claim 10, wherein the radius of curvature of the surface of the first lens away from the second lens is r 11-3 , the radius of curvature of the surface of the second lens away from the third lens is r 12-3 , the radius of curvature of the surface of the second lens away from the third lens is r 21-3 , the radius of curvature of the surface of the third lens away from the third lens is r 22-3 , the radius of curvature of the surface of the third lens adjacent to the second lens is r 31-3 , the radius of curvature of the surface of the third lens away from the second lens is r 32-3 , and the following: The r 21-3 surface is the same positive and negative of the focal power of the plane ,3＜|r 12-3 /r 11-3 |＜4.5,2＜|r 31-3 /r 32-3 |＜3,0.8＜|r 31-3 /r 22-3 |＜1.3,1.8＜|r 11-3 /r 22-3 |＜2.5,r 31-3 and the r 32-3 , and the focal power of the r 11-3 and the r 12-3 are opposite; The refractive indexes of the first lens, the second lens and the third lens are respectively n 1-3 、n 2-3 、n 3-3 , and 1.5< n 1-3 、n 2-3 ＜1.6,1.6＜n 3-3 <1.7 is satisfied.
12. The apparatus of claim 1, wherein the first lens has positive optical power and the optical powers of the second lens and the third lens are opposite.
13. The apparatus of claim 1, wherein the second lens and the third lens each have negative optical power, and an absolute value of a focal length of the second lens is 2 times and more than an absolute value of a focal length of the third lens.
14. The apparatus of claim 1, wherein the distance between the center of the first lens near the display screen and the first quarter wave plate is D a in the case where the second quarter wave plate and the polarizing reflective film are disposed on the first lens, the distance between the center of the first lens near the display screen side surface and the first quarter wave plate is D b in the case where the second quarter wave plate and the polarizing reflective film are disposed on the second lens, and wherein D b ＞D a .
15. The apparatus of claim 14, wherein D a and D b are both greater than 10mm.
16. The apparatus of claim 1, wherein in the case where the second lens is a positive lens, the second lens is batwing shaped.
17. The apparatus of claim 1, wherein, with the second quarter wave plate and polarizing reflective film disposed on the first lens: The first lens is a plano-convex lens, the second lens is a biconcave lens or a meniscus lens, and the third lens The mirror is one of biconvex, plano-convex and meniscus lenses, or The first lens is a plano-convex lens, the second lens is batwing shaped, and the third lens is meniscus shaped.
18. A virtual reality optical system, comprising: display screen, and The apparatus of any one of claims 1-17.

Description

Virtual reality optical device and system Technical Field The invention relates to the technical field of virtual reality, and particularly provides virtual reality optical equipment and a system. Background VR (Virtual Reality) is a system that can create and experience a Virtual world. ‌ it creates a virtual environment similar to or completely new to the real environment through computer technology, so that the user can be immersed therein, and get the feeling of being in the scene. In the currently widely used catadioptric VR systems, the Field of View (FOV) is within 110 °. FOV is one of the key parameters for measuring immersion of VR system, which determines the visual field range that the user can see in the virtual environment, and in order to further improve the broader visual field and immersion of the user, it is necessary to develop a VR optical system with a large FOV. Disclosure of Invention In order to overcome the above-mentioned drawbacks, the present invention provides a virtual reality optical device and system, which has the advantages of light and thin profile and wide field of view. In a first aspect, the invention provides virtual reality optical equipment, which comprises a first quarter wave plate, a third lens, a second lens, a first lens, a second quarter wave plate, a polarization reflecting film and a partial reflecting film, wherein the first quarter wave plate, the third lens, the second lens and the first lens are sequentially arranged, the second quarter wave plate and the polarization reflecting film are arranged on the second lens or the first lens and are both positioned on one side far away from a display screen, the second quarter wave plate is closer to the display screen than the polarization reflecting film, and the partial reflecting film is arranged on one side, close to the display screen, of the third lens. Further, the device comprises an anti-reflection film, wherein the anti-reflection film is positioned on one side of the polarized reflection film away from the display screen. Further, the slow axis direction of the first quarter wave plate and the slow axis direction of the second quarter wave plate are perpendicular to each other, the slow axis of the first quarter wave plate and the polarization direction of the polarization reflecting film form an angle of 45 degrees, the slow axis of the second quarter wave plate and the polarization direction of the polarization reflecting film form an angle of 45 degrees, and the polarization direction of the polarization reflecting film and the polarization direction of the display screen after light is emitted are perpendicular to each other. Further, the second lens and the third lens are bonded. Further, the second lens and the third lens are attached, the first lens is arranged adjacent to the second lens, and the second quarter wave plate and the polarized reflecting film are arranged on the first lens. Further, the first lens has a focal length of F 1-1, the second lens has a focal length of F 2-1, the third lens has a focal length of F 3-1, and the device has a focal length of F 1, satisfying ：3＜f1-1/F1＜5,5＜|f2-1/F1|＜7,0.8＜|f1-1/f2-1|＜1,20mm＜F1＜40mm; and/or The first lens and the second lens have a spacing D 1-1, the second lens and the third lens have a spacing D 2-1, the third lens and the display screen have a spacing D 1, the requirements of 5mm > D 1-1＞0.5mm,0.5＜D1/d1-1＜25,d2-1 = 0, and/or The first lens thickness T 1-1, the second lens thickness T 2-1, and the third lens thickness T 3-1 satisfy 0.8< T 1-1/T3-1＜1.5,3＜T1-1/T2-1 <5. Further, the radius of curvature of the surface of the first lens far from the second lens is r 11-1, the radius of curvature of the surface close to the second lens is r 12-1, the radius of curvature of the surface of the second lens far from the third lens is r 21-1, the radius of curvature of the surface close to the third lens is r 22-1, the radius of curvature of the surface of the third lens close to the second lens is r 31-1, the radius of curvature of the surface far from the second lens is r 32-1, the requirements that the plane ,r22-1=r31-1,2.5＜|r21-1/r12-1|＜3,0.8＜|r32-1/r21-1|＜1.1,2.5＜|r21-1/r22-1|＜3,r21-1 of the surface r 11-1 is the same as the positive and negative of the focal power of the r 32-1, the focal power of the r 32-1 and the focal power of the r 31-1 are opposite, and/or The refractive indexes of the first lens, the second lens and the third lens are respectively n 1-1、n2-1、n3-1, and 1.5< n 1-1、1.6＜n2-1＜1.7、n3-1 <1.6 is satisfied. Further, the second lens is attached to the third lens, and the first lens is spaced apart from the second lens. Further, the first lens focal length is F 1-2, the second lens focal length is F 2-2, the third lens focal length is F 3-2, the focal length of the whole system is F 2, and 1.5< |f 1-2/F2-2|＜3,0.9＜|f2-2/f3-2 | <1.1 or F 2-2/f3-2＞2,5＜|f3-2/F2 | <9, and/or The interval of the first lens and the second lens is D 1-2, th