CN117761873A

CN117761873A - Optical system and VR equipment

Info

Publication number: CN117761873A
Application number: CN202410083754.1A
Authority: CN
Inventors: 赵世一; 冯梦怡; 张晓彬; 游金兴; 金银芳; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2024-01-19
Filing date: 2024-01-19
Publication date: 2024-03-26

Abstract

The application discloses optical system and VR equipment including this optical system, this optical system includes: the lens assembly comprises a lens barrel and a lens assembly arranged in the lens barrel, wherein the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and a maximum height L of the lens barrel in the optical axis direction satisfy: 11.0 < L/(T12+T23) < 24.0. The optical system provided by the application has the advantages of low molding difficulty, miniaturization and high imaging quality, and can realize good user experience by being matched with VR equipment.

Description

Optical system and VR equipment

Technical Field

The present application relates to the field of optical elements, and more particularly, to an optical system and VR device including the same.

Background

In recent years, with the concept of "meta universe" being proposed, people are increasingly entertaining, and devices such as AR/VR with man-machine interaction are increasingly favored by people. However, the current VR lens has the biggest defects of large volume, heavy weight and dizziness, and cannot well meet the demands of people. In order to better eliminate the above-mentioned drawbacks of VR lenses, improving the user's experience, miniaturization, weight saving and imaging quality of lenses become the most important factors for improving the consumer's experience. Therefore, how to make the structure of the VR lens more compact and light is one of the hot spots studied by the person in the field to improve the imaging quality and the processability of the lens by optimizing the structural design in terms of eliminating chromatic aberration, phase difference and various stray light problems.

Disclosure of Invention

A first aspect of the present application provides an optical system comprising: the lens assembly comprises a lens barrel and a lens assembly arranged in the lens barrel, wherein the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and a maximum height L of the lens barrel in the optical axis direction satisfy: 11.0 < L/(T12+T23) < 24.0.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein the outer diameter D1m of the second side surface of the first spacer and the inner diameter D1m of the second side surface of the first spacer satisfy: 4.5 < D1 m/(D1 m-D1 m) < 17.5.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; the maximum height L of the lens barrel along the optical axis direction, the distance EP01 between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction, the maximum thickness CP1 of the first spacer along the optical axis direction, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 0.7 < (L-EP 01-CP 1)/(CT2+CT3) < 1.6.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein, the inner diameter d1s of the first side surface of the first spacer, the refractive index N1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 3.5 < d1 s/(N1×CT1) < 15.5.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein, the external diameter D1s of the first side of the first spacer, the internal diameter D1s of the first side of the first spacer and the central thickness CT1 of the first lens on the optical axis satisfy: 0.5 < (D1 s-D1 s)/CT 1 < 1.6.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein, the outer diameter D1m of the second side of the first spacer, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 2.0 < D1 m/(N2×CT2+N3×CT3) < 4.5.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein, the distance EP01 between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction and the center thickness CT1 of the first lens on the optical axis satisfy the following conditions: EP01/CT1 is more than 0.1 and less than 1.1.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein, the maximum thickness CP1 of the first spacer in the optical axis direction and the air interval T12 of the first lens and the second lens on the optical axis satisfy: CP1/T12 is more than or equal to 0 and less than 4.0.

In one embodiment, the optical system further comprises at least one spacer disposed within the barrel; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and contacted with the first lens; wherein, the internal diameter d0s of the front end surface of the lens barrel and the internal diameter d1s of the first side surface of the first spacer satisfy: 0.5 < d0s/d1s < 1.0.

In one embodiment, the on-axis distance TD of the first side surface of the first lens to the second side surface of the third lens, the outer diameter D0m of the rear end surface of the lens barrel, and the outer diameter D0s of the front end surface of the lens barrel satisfy: TD/(D0 m-D0 s) < 3.5.

In one embodiment, the at least one spacer further comprises: and a second spacer disposed between the lens barrel and the first side of the first lens.

In one embodiment, the outer diameter D0s of the front end surface of the lens barrel, the inner diameter D0s of the front end surface of the lens barrel, the outer diameter D01s of the first side surface of the second spacer, and the inner diameter D01s of the first side surface of the second spacer satisfy: 1.3 < (D0 s-D0 s)/(D01 s-D01 s) < 2.2.

In one embodiment, a center thickness CT1 of the first lens on the optical axis, a distance EP001 between the front end surface of the lens barrel and the first side surface of the second spacer in the optical axis direction satisfies: CT1/EP001 < 5.0.

In one embodiment, the optical system further includes a reflection assembly, the reflection assembly including, in order from the first side to the second side along the optical axis, a reflective polarizing element, a quarter wave plate, and a partially reflective layer, wherein the reflective polarizing element and the quarter wave plate are disposed on at least one of the first side and the second side of the first lens and the second lens, and the partially reflective layer is disposed on the first side or the second side of the third lens.

The second aspect of the present application also provides an optical system comprising: the lens assembly comprises a lens barrel, a lens assembly and at least one spacer, wherein the lens assembly and the at least one spacer are arranged in the lens barrel, and the at least one spacer comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the first lens; the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; the maximum height L of the lens barrel along the optical axis direction, the distance EP01 between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction, the maximum thickness CP1 of the first spacer along the optical axis direction, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy the following conditions: 0.7 < (L-EP 01-CP 1)/(CT2+CT3) < 1.6.

A third aspect of the present application also provides an optical system comprising: the lens assembly comprises a lens barrel, a lens assembly and at least one spacer, wherein the lens assembly and the at least one spacer are arranged in the lens barrel, and the at least one spacer comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the first lens; the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and an outer diameter D1s of the first side surface of the first spacer, an inner diameter D1s of the first side surface of the first spacer, and a center thickness CT1 of the first lens on the optical axis satisfy: 0.5 < (D1 s-D1 s)/CT 1 < 1.6.

The fourth aspect of the present application also provides an optical system comprising: the lens assembly comprises a lens barrel, a lens assembly and at least one spacer, wherein the lens assembly and the at least one spacer are arranged in the lens barrel, and the at least one spacer comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the first lens; the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and an outer diameter D1m of the second side surface of the first spacer, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 2.0 < D1 m/(N2×CT2+N3×CT3) < 4.5.

A fifth aspect of the present application also provides a VR device, comprising: the optical system provided in any one of the above embodiments; and an emission section for emitting an optical signal including image information; the optical system is arranged in the light emitting direction of the emitting part, and the third lens is arranged closer to the emitting part than the first lens, and the optical system is used for modulating and transmitting the light signals emitted by the emitting part to human eyes.

The application provides an optical system and VR equipment adopts three lenses, has characteristics such as projection quality is good, total length is less and machinability is good, the optical system that this application provided makes the second side of second lens and the first side of third lens be the plane through the face type of control second lens and third lens, glue second lens and third lens and satisfy 0mm and be less than or equal to 0.02mm and 11.0 < L/(T12+T23) < 24.0, reduced the shaping degree of difficulty of lens effectively, the total length of lens, weight and stray light risk have not been increased yet simultaneously. Meanwhile, the air interval between the first lens and the second lens and the maximum height of the lens barrel are limited, so that the field curvature of the system is restrained within a certain range, and finally, the whole lens has a good imaging effect.

Drawings

Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

FIG. 1 shows a schematic diagram of some parameters of an optical system according to the present application;

fig. 2 shows a schematic structural diagram of a VR device according to the present application;

fig. 3A and 3B show schematic structural views of optical systems according to embodiment 1 and embodiment 2 of the present application, respectively;

fig. 4A to 4C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical systems according to embodiments 1 and 2 of the present application, respectively;

fig. 5A and 5B show schematic structural views of optical systems according to embodiment 3 and embodiment 4 of the present application, respectively;

fig. 6A to 6C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical systems according to embodiment 3 and embodiment 4 of the present application, respectively;

fig. 7A and 7B show schematic structural views of optical systems according to embodiment 5 and embodiment 6 of the present application, respectively;

fig. 8A to 8C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical systems according to embodiment 5 and embodiment 6 of the present application, respectively;

Fig. 9A and 9B show schematic structural views of optical systems according to embodiment 7 and embodiment 8 of the present application, respectively; and

fig. 10A to 10C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical systems according to embodiment 7 and embodiment 8 of the present application, respectively;

fig. 11 shows a cross-sectional view of a lens barrel of an optical system according to the present application along a plane of an optical axis.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation of the feature. Accordingly, a first lens discussed below may also be referred to as a second lens, and a second lens may also be referred to as a first lens, without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The features, principles and other aspects of the present application are described in detail below with reference to the accompanying drawings and in connection with the embodiments.

An optical system according to an exemplary embodiment of the present application includes: lens barrel and lens assembly disposed in the lens barrel. The lens assembly may include three lenses having optical powers, a first lens, a second lens, and a third lens, respectively. The three lenses are arranged in sequence along the optical axis from the first side to the second side. The barrel has a front end face facing the first side and a rear end face facing the second side, and may be an integral barrel, for example.

In an exemplary embodiment, the optical system provided herein may be applied to, for example, VR devices, where the first side may be, for example, the human eye side and the second side may be, for example, the display side or the image source side.

The optical system according to the exemplary embodiments of the present application may further include at least one spacer, which may be disposed between any two adjacent lenses, and may be disposed between the lens barrel and the first side of the first lens or between the lens barrel and the second side of the third lens. For example, the at least one spacer may include a first spacer disposed between and in contact with the first lens and the second lens. Illustratively, the at least one spacer may include a second spacer disposed between the barrel and the first side of the first lens.

It should be understood that the present application is not specifically limited to the number of spacers, and any number of spacers may be included between any two lenses, and the entire optical system may also include any number of spacers. Optionally, the at least one spacer may further include a third spacer disposed between and in contact with the second lens, as needed. Optionally, the at least one spacer may further include a fourth spacer disposed between the second side of the third lens and the barrel, as needed. The spacer is helpful for the optical system to intercept redundant refraction and reflection light paths and reduce the generation of stray light and ghost images. Auxiliary bearing can be added between the spacer and the lens barrel, so that the problems of poor assembly stability, low performance yield and the like caused by large-level difference between lenses are solved. Through reasonable setting of the number, thickness, inner diameter and outer diameter of the spacers, the assembly of the optical system is improved, stray light is shielded, and the projection quality of the optical system is improved.

The optical system according to exemplary embodiments of the present application may further include a reflective assembly including at least one reflective element, which may be, for example, a reflective polarizing element, a quarter wave plate, and a partially reflective layer. The optical system can reflect light with a certain polarization direction by arranging the reflective polarizing element, and simultaneously transmit light orthogonal to the polarization direction; the optical system can change the polarization state of light by arranging a quarter wave plate; the partial reflecting layer has a semi-transparent and semi-reflective function, and the optical system can realize reflection and transmission by arranging the partial reflecting layer.

The reflective polarizer and the quarter wave plate are attached to the surface of the first lens or the second lens, so that the polarization state of polarized light can be changed, light is reflected when passing through the reflective polarizer for the first time, and light is transmitted when passing through the reflective polarizer for the second time; at least one of the first side surface and the second side surface of the third lens is provided with a partial reflecting layer, and the reflecting polaroid and the quarter wave plate are combined with the partial reflecting layer, so that the light path of the optical system can realize refraction and reflection, and the length of the optical system is reduced.

In an exemplary embodiment, the reflective polarizing element may be disposed at the first side or the second side of the first lens, and the reflective polarizing element may be further disposed at the first side of the second lens; the quarter wave plate may be disposed on the first side or the second side of the second lens, and the partially reflective layer may be disposed on the first side or the second side of the third lens.

In an exemplary embodiment, the reflective polarizing element and the quarter wave plate may be attached together to the first side of the second lens.

An optical system according to an exemplary embodiment of the present application includes: lens barrel and lens assembly disposed in the lens barrel. The lens assembly may include three lenses having optical powers, a first lens, a second lens, and a third lens, respectively. The three lenses are arranged in sequence along the optical axis from the first side to the second side. The lens barrel has a front end surface facing the first side and a rear end surface facing the second side. Wherein the second side of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface. The optical system can meet the requirements that T23 is more than or equal to 0mm and less than or equal to 0.02mm, and 11.0 is less than or equal to L/(T12+T23) < 24.0, wherein T23 is the air interval of the second lens and the third lens on the optical axis, T12 is the air interval of the first lens and the second lens on the optical axis, and L is the maximum height of the lens barrel along the optical axis direction. According to the lens forming device, the second side face of the second lens and the first side face of the third lens are plane by controlling the surface types of the second lens and the third lens, the second lens and the third lens can be glued, the convex-concave lens with optical design is divided into the convex lens and the flat-concave lens, the forming difficulty of the lens is effectively reduced, and meanwhile the total length, the weight and the stray light risk of the lens are not increased. Meanwhile, the air interval between the first lens and the second lens and the maximum height of the lens barrel are limited, so that the field curvature of the system is restrained within a certain range, and finally, the whole lens has a good imaging effect.

Fig. 1 shows a schematic diagram of part of parameters of an optical system according to the present application. It will be appreciated by those skilled in the art that some parameters of the lens (e.g., the center thickness CT2 of the second lens on the optical axis) that are often used in the art are not shown in fig. 1, and fig. 1 illustrates only some of the parameters of the barrel and spacer of one optical system of the present application for a better understanding of the present invention. As shown in fig. 1, L represents the maximum height of the lens barrel in the optical axis direction, EP01 represents the distance between the front end surface of the lens barrel and the first side surface of the first spacer in the optical axis direction, EP001 represents the distance between the front end surface of the lens barrel and the first side surface of the second spacer in the optical axis direction, CP1 represents the maximum thickness of the first spacer in the optical axis direction, D0s represents the outer diameter of the front end surface of the lens barrel, D0s represents the inner diameter of the front end surface of the lens barrel, D1s represents the outer diameter of the first side surface of the first spacer, D1s represents the inner diameter of the first side surface of the first spacer, D01s represents the outer diameter of the first side surface of the second spacer, D1m represents the outer diameter of the second side surface of the first spacer, and D0m represents the outer diameter of the rear end surface of the lens barrel.

In an exemplary embodiment, the optical system of the present application may satisfy: 4.5 < D1 m/(D1 m-D1 m) < 17.5, where D1m is the outer diameter of the second side of the first spacer and D1m is the inner diameter of the second side of the first spacer. Satisfying 4.5 < D1 m/(D1 m-D1 m) < 17.5 is advantageous in that the structural support of the first spacer is ensured while the first spacer does not interfere with the assembly of the first lens and the second lens, and in that the workability of the first spacer and the compactness required for the overall structure are balanced.

In an exemplary embodiment, the optical system of the present application may satisfy: 0.7 < (L-EP 01-CP 1)/(CT 2+ CT 3) < 1.6, wherein L is the maximum height of the lens barrel in the optical axis direction, EP01 is the distance between the front end surface of the lens barrel and the first side surface of the first spacer in the optical axis direction, CP1 is the maximum thickness of the first spacer in the optical axis direction, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. Satisfies 0.7 < (L-EP 01-CP 1)/(CT 2+CT3) < 1.6, can prevent that the lens barrel length from overlength from influencing the length of complete machine, can reasonably distribute the thickness of first spacer, second lens and third lens again, avoid it too little, guarantee the workability of first spacer, second lens and third lens under the prerequisite of guaranteeing system's assemblage stability.

In an exemplary embodiment, the optical system of the present application may satisfy: 3.5 < d1 s/(N1×CT1) < 15.5, where d1s is the inner diameter of the first side of the first spacer, N1 is the refractive index of the first lens, and CT1 is the center thickness of the first lens on the optical axis. Satisfies 3.5 < d1 s/(N1×CT1) < 15.5, can control the appearance of the first lens, is favorable for the workability thereof, and also ensures the bearing stability of the first lens and the first spacer, thereby being beneficial to the lens assembly and the reliability.

In an exemplary embodiment, the optical system of the present application may satisfy: 0.5 < (D1 s-D1 s)/CT 1 < 1.6, wherein D1s is the outer diameter of the first side of the first spacer, D1s is the inner diameter of the first side of the first spacer, and CT1 is the center thickness of the first lens on the optical axis. The lens satisfies 0.5 < (D1 s-D1 s)/CT 1 < 1.6, can control the appearance of the first lens, is beneficial to the processability, and simultaneously ensures the bearing stability of the first lens and the first spacer, thereby being beneficial to the lens assembly and the reliability.

In an exemplary embodiment, the optical system of the present application may satisfy: 2.0 < D1 m/(N2×CT2+N3×CT3) < 4.5, wherein D1m is the outer diameter of the second side of the first spacer, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. Satisfies 2.0 < D1 m/(N2×CT2+N3×CT3) < 4.5, can control the appearance of the second lens and the third lens, is beneficial to the processability thereof, and also ensures the bearing stability of the second lens, the third lens and the second spacer, thereby being beneficial to the lens assembly and the reliability.

In an exemplary embodiment, the optical system of the present application may satisfy: 0.1 < EP01/CT1 < 1.1, wherein EP01 is the distance between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction, and CT1 is the center thickness of the first lens on the optical axis. Satisfies 0.1 < EP01/CT1 < 1.1, can reasonably distribute the thicknesses of the front end surfaces of the first lens and the lens barrel, and ensures the workability of the first lens and the lens barrel on the premise of ensuring the system assembly.

In an exemplary embodiment, the optical system of the present application may satisfy: 0.ltoreq.CP1/T12 < 4.0, where CP1 is the maximum thickness of the first spacer in the direction of the optical axis and T12 is the air separation of the first lens and the second lens on the optical axis. The method satisfies that CP1/T12 is less than or equal to 0 and less than 4.0, can reasonably distribute the air space of the first lens and the second lens on the optical axis and the thickness of the first spacer, and avoid over-convex or over-concave of the first lens and the second lens, thereby reducing the processing difficulty of the first lens and the second lens.

In an exemplary embodiment, the optical system of the present application may satisfy: 0.5 < d0s/d1s < 1.0, wherein d0s is the inner diameter of the front end surface of the lens barrel and d1s is the inner diameter of the first side surface of the first spacer. FIG. 11 is a cross-sectional view of the lens barrel along the plane of the optical axis, the inner diameter of the lens barrel P0 gradually increases from the front end face to the rear end face, and the connection lines between the front end face and the inner wall of the rear end face of the lens barrel P0 on both sides of the optical axis form an opening angle The optical system of the application satisfies 0.5 < d0s/d1s < 1.0, can limit the structural trend of the inner wall of the lens barrel, prevents the lens barrel from having too large opening angle and not having processability, and on the other hand, prevents the lens barrel from having too small opening angle, which is not beneficial to the appearance design of the lens.

In an exemplary embodiment, the optical system of the present application may satisfy: 0.5 < TD/(D0 m-D0 s) < 3.5, where TD is the on-axis distance from the first side of the first lens to the second side of the third lens, D0m is the outer diameter of the rear end face of the barrel, and D0s is the outer diameter of the front end face of the barrel. The requirement of 0.5 < TD/(D0 m-D0 s) < 3.5 is met, the structural profile trend of the lens barrel can be limited, and on one hand, the outer diameter of the lens barrel is prevented from being too large, and the assembly space of the whole machine design is prevented from being influenced; on the other hand, the outer diameter of the lens barrel is prevented from being too small, and the processing and forming difficulty is too high.

In an exemplary embodiment, the optical system of the present application further includes a second spacer disposed between the barrel and the first side of the first lens, and the larger thickness tolerance range of the first lens affects the distance of the first lens from the display screen due to the larger size of the first lens and the barrel. And through setting up the spacer of different thickness specifications between the first side of lens cone and first lens, can guarantee that the first lens can not produce great deviation to the distance of display screen to guarantee the camera lens performance.

In an exemplary embodiment, the optical system of the present application may satisfy: 1.3 < (D0 s-D0 s)/(D01 s-D01 s) < 2.2, wherein D0s is the outer diameter of the front end face of the lens barrel, D0s is the inner diameter of the front end face of the lens barrel, D01s is the outer diameter of the first side face of the second spacer, and D01s is the inner diameter of the first side face of the second spacer. Satisfies that (D0 s-D0 s)/(D01 s-D01 s)/(D01 s) is less than 2.2, can limit the appearance of the front end face of the lens barrel, prevents that the front end face of the lens barrel from bearing too little to influence the lens assembly on the one hand, prevents that the front end face of the lens barrel from being too big on the other hand, occupies too much whole machine space.

In an exemplary embodiment, the optical system of the present application may satisfy: 1.0 < CT1/EP001 < 5.0, wherein CT1 is the center thickness of the first lens on the optical axis, and EP001 is the distance between the front end surface of the lens barrel and the first side surface of the second spacer in the direction of the optical axis. The thickness of the front end surfaces of the first lens and the lens barrel can be reasonably distributed on the premise of ensuring the system assembly, and the workability of the first lens and the lens barrel is ensured on the premise of meeting the requirement that CT1/EP001 is less than 5.0 and more than 1.0.

In an exemplary embodiment, the optical system of the present application may include at least one aperture. The diaphragm can restrict the light path and control the intensity of light. The aperture may be arranged in a suitable position of the optical system, for example the aperture may be located on the first side of the first lens.

The optical system provided by the application is a three-piece type refraction and reflection optical system, and the folding effect of an imaging light path is realized by utilizing the additional function of a quarter wave plate on the polarized light phase, the light splitting function of a reflective polarizing element and the reflection function of a partial reflection layer, so that the height of the body can be better compressed, and the imaging quality is improved.

An optical system according to an exemplary embodiment of the present application includes: the lens assembly comprises a lens barrel, a lens assembly and at least one spacer, wherein the lens assembly and the at least one spacer are arranged in the lens barrel, and the at least one spacer comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the first lens; the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the optical system can meet the requirements that T23 is more than or equal to 0mm and less than or equal to 0.02mm and 0.7 < (L-EP 01-CP 1)/(CT 2+CT3) < 1.6, wherein T23 is the air interval of the second lens and the third lens on the optical axis, L is the maximum height of the lens barrel along the optical axis direction, EP01 is the distance between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction, CP1 is the maximum thickness of the first spacer along the optical axis direction, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. On the one hand, the surface type of this application control second lens and third lens makes the second side of second lens and the first side of third lens be the plane, can glue second lens and third lens and with, has reduced the shaping degree of difficulty of lens effectively, has not increased total length, weight and the parasitic light risk of camera lens simultaneously, on the other hand, this application still rationally controls lens cone length and rationally distributes the thickness of first spacer, second lens and third lens, under the prerequisite of guaranteeing system's assemblage stability, guarantees the machinability of first spacer, second lens and third lens.

An optical system according to an exemplary embodiment of the present application includes: the lens assembly comprises a lens barrel, a lens assembly and at least one spacer, wherein the lens assembly and the at least one spacer are arranged in the lens barrel, and the at least one spacer comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the first lens; the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and an outer diameter D1s of the first side surface of the first spacer, an inner diameter D1s of the first side surface of the first spacer, and a center thickness CT1 of the first lens on the optical axis satisfy: 0.5 < (D1 s-D1 s)/CT 1 < 1.6. On the one hand, the surface type of this application control second lens and third lens makes the second side of second lens and the first side of third lens be the plane, can glue second lens and third lens and with, has reduced the shaping degree of difficulty of lens effectively, has not increased total length, weight and the parasitic light risk of camera lens simultaneously, on the other hand, the appearance of first lens is still controlled to this application, guarantees its machinability, still guarantees the stability that first lens and first interval piece held by simultaneously, improves camera lens assemblage stability and reliability.

An optical system according to an exemplary embodiment of the present application includes: the lens assembly comprises a lens barrel, a lens assembly and at least one spacer, wherein the lens assembly and the at least one spacer are arranged in the lens barrel, and the at least one spacer comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the first lens; the lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens; the lens barrel has a front end surface facing the first side and a rear end surface facing the second side; the second side surface of the second lens is a plane; the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface; the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and an outer diameter D1m of the second side surface of the first spacer, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 2.0 < D1 m/(N2×CT2+N3×CT3) < 4.5. On the one hand, the surface type of second lens and third lens is controlled to this application, makes the second side of second lens and the first side of third lens be the plane, can glue second lens and third lens and with, has reduced the shaping degree of difficulty of lens effectively, has not increased total length, weight and the parasitic light risk of camera lens simultaneously, and on the other hand, the appearance of second lens and third lens is still controlled to this application, guarantees its machinability, still guarantees the stability that second lens, third lens and second spacer held by the back simultaneously, improves camera lens group stability and reliability.

According to some embodiments of the present application, the optical system according to the present application is a low-volume optical system of high definition imaging quality, and in application, the optical system according to the exemplary embodiments of the present application may be suitable for VR devices. Through reasonable setting of parameters such as central thickness, refractive index, abbe number, curvature radius of a lens of an optical system, and through reasonable setting of diaphragm parameters, the purpose of a wide angle of a VR device can be met, chromatic aberration of the system is corrected, and imaging quality of the system is improved. Through setting up the spacer between the lens, can also be favorable to the processability of lens, reduce the sensitivity of lens, improve the assemblage yield to can satisfy VR and equip miniaturized target under the prerequisite of guaranteeing optical system performance.

When the optical system provided by the application is applicable to VR devices, the first side may be, for example, a human eye side, and the second side may be, for example, a display side or an image source side. Fig. 2 shows a schematic structural diagram of a VR device according to an exemplary embodiment of the present application, where the VR device sequentially includes, from a first side to a second side along an optical axis: a receiving part J, an optical system C and a transmitting part F. The receiving portion J in fig. 2 may be, for example, a human eye. The optical system C may be the optical system provided in any of the above embodiments, and the emitting portion F may be a display screen. The transmitting part F is used for transmitting an optical signal, and the optical signal can comprise image information; the optical system is arranged in the light emitting direction of the emitting part, and the third lens is arranged closer to the emitting part than the first lens, and the optical system is used for modulating and transmitting the light signals emitted by the emitting part to human eyes. Illustratively, the image light on the display screen is refracted and reflected multiple times by the third lens, the second lens, the first lens, the quarter wave plate, the reflective polarizing element and the like, and finally projected to the eyes of the user.

Specific examples of the optical system applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

Fig. 3A shows a schematic structural view of an optical system according to embodiment 1 of the present application. As shown in fig. 3A, the optical system includes: the lens assembly includes a first lens E1, a second lens E2, and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP disposed on a first side of the first lens, a quarter wave plate QWP disposed on a first side of the second lens, and a partially reflective layer BS disposed on a second side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

Table 1 shows basic parameters of the optical system of example 1, in which the unit of radius of curvature and thickness are both millimeters (mm). Table 1 only exemplifies the correspondence between the surface numbers of the partial surfaces and the partial elements, and the positions of the common surfaces in table 1 are inconvenient to mark all the elements due to the problem of the common surfaces of the adjacent elements.

TABLE 1

For example, when the optical system is applied to, for example, a VR device, the first side may, for example, be the human eye side and the second side may, for example, be the display side or the image source side. Referring to table 1, the receiving part may be a human eye and the transmitting part may be a display screen. The light from the emitting portion sequentially passes through the third lens E3, the second lens E2, the quarter wave plate QWP, the first lens E1, and reaches the reflective polarizing element RP, is reflected at the reflective polarizing element RP and passes through the first lens E1, the quarter wave plate QWP, the second lens E2, and the third lens E3 again, and then the light beam is reflected again at the partial reflection layer BS on the second side surface S6 of the third lens E3 and passes through the third lens E3, the second lens E2, the quarter wave plate QWP, and the first lens E1 in order to reach the reflective polarizing element RP, passes through the stop STO, and finally exits toward the human eye side. In an exemplary embodiment, the partially reflective layer BS may be a semi-transparent and semi-reflective film layer plated on the second side S6 of the third mirror E3.

In embodiment 1, the first side surface S1 and the second side surface S2 of the first lens E1, the first side surface S3 of the second lens E2, and the second side surface S6 of the third lens E3 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows cone coefficients and higher order coefficients A for each of the aspherical mirror surfaces S1-S3 and S6 usable in example 1 ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Watch (watch)

Table 3 shows basic parameters of the lens barrel and the spacer of the optical system of example 1, and each parameter in table 3 is in millimeters (mm).

Parameter name	Example 1
		d1s(mm)	36.74
d1m(mm)	37.88
		D1s(mm)	39.41
D1m(mm)	40.28
		d0s(mm)	34.15
D0s(mm)	40.82
		D0m(mm)	45.71
EP01(mm)	1.54
		CP1(mm)	2.68
d01s(mm)	36.09
		D01s(mm)	39.35
EP001(mm)	1.40
		L(mm)	10.07

TABLE 3 Table 3

Example 2

Fig. 3B shows a schematic structural view of an optical system according to embodiment 2 of the present application. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity.

As shown in fig. 3B, the optical system of embodiment 2 includes a lens barrel P0, and a lens assembly, a reflective assembly and at least one spacer disposed in the lens barrel P0, wherein the lens assembly includes a first lens E1, a second lens E2 and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP disposed on a first side of the first lens, a quarter wave plate QWP disposed on a first side of the second lens, and a partially reflective layer BS disposed on a second side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

The lens assembly and the reflecting assembly of the optical system of embodiment 2 are identical to those of the optical system of embodiment 1, respectively, and their basic parameters are shown in tables 1 to 2, and are not repeated.

Table 4 shows basic parameters of the lens barrel and the spacer of the optical system of example 2, and each parameter in table 4 is in millimeters (mm).

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TABLE 4 Table 4

Fig. 4A shows on-axis chromatic aberration curves of the optical systems of embodiment 1 and embodiment 2, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows astigmatism curves of the optical systems of embodiment 1 and embodiment 2, which represent meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows distortion curves of the optical systems of example 1 and example 2, which represent distortion magnitude values corresponding to different half angles of view. As can be seen from fig. 4A to 4C, the optical systems provided in embodiment 1 and embodiment 2 can achieve good imaging quality.

Example 3

Fig. 5A shows a schematic structural diagram of an optical system according to embodiment 3 of the present application. As shown in fig. 5A, the optical system includes: the lens assembly includes a first lens E1, a second lens E2, and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP disposed on the second side of the first lens, a quarter wave plate QWP disposed on the second side of the second lens, and a partially reflective layer BS disposed on the second side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

Table 5 shows basic parameters of the optical system of example 3, in which the unit of radius of curvature and thickness are both millimeters (mm). Table 5 only exemplifies the correspondence between the surface numbers of the partial surfaces and the partial elements, and the positions of the common surfaces in table 5 are inconvenient to mark all the elements due to the problem of the common surfaces of the bonding between the adjacent elements.

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TABLE 5

For example, when the optical system is applied to, for example, a VR device, the first side may, for example, be the human eye side and the second side may, for example, be the display side or the image source side. Referring to table 5, the receiving part may be a human eye and the transmitting part may be a display screen. The light from the emitting portion sequentially passes through the third lens E3, the quarter wave plate QWP, the second lens E2, and the reflective polarizing element RP, is reflected at the reflective polarizing element RP and passes through the second lens E2, the quarter wave plate QWP, and the third lens E3 again, and then the light beam is reflected again at the partially reflective layer BS on the second side surface S6 of the third mirror E3 and passes through the third lens E3, the quarter wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 in this order, passes through the aperture stop STO, and finally exits toward the human eye side. In an exemplary embodiment, the partially reflective layer BS may be a semi-transparent and semi-reflective film layer plated on the second side S6 of the third mirror E3.

In embodiment 3, the first side surface S1 of the first lens E1, the first side surface S3 of the second lens E2, and the second side surface S6 of the third lens E3 are aspherical surfaces, wherein each aspherical surface type may be defined by the formula (1) given in embodiment 1 above. Table 6 shows cone coefficients and higher order coefficients A for each of the aspherical mirror surfaces S1-S3 and S6 usable in example 3 ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Face number	Coefficient of taper	A4	A6	A8	A10
						S1	0.0000	1.04E-05	-6.39E-09	-7.01E-11	0.00E+00
S3	0.0000	-2.17E-06	-2.38E-08	3.89E-11	-3.58E-14
						S6	0.0000	1.78E-06	-1.96E-09	-4.85E-12	0.00E+00

TABLE 6

Table 7 shows basic parameters of the lens barrel and the spacer of the optical system of example 3, and each parameter in table 7 is in millimeters (mm).

Parameter name	Example 3
		d1s(mm)	38.52
d1m(mm)	39.24
		D1s(mm)	41.19
D1m(mm)	41.64
		d0s(mm)	34.71
D0s(mm)	42.60
		D0m(mm)	45.94
EP01(mm)	1.54
		CP1(mm)	2.19
d01s(mm)	35.43
		D01s(mm)	41.13
EP001(mm)	1.40
		L(mm)	10.43

TABLE 7

Example 4

Fig. 5B shows a schematic structural diagram of an optical system according to embodiment 4 of the present application.

As shown in fig. 5B, the optical system of embodiment 4 includes a lens barrel P0, and a lens assembly, a reflective assembly and at least one spacer disposed in the lens barrel P0, wherein the lens assembly includes a first lens E1, a second lens E2 and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP disposed on the second side of the first lens, a quarter wave plate QWP disposed on the second side of the second lens, and a partially reflective layer BS disposed on the second side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

The lens assembly and the reflecting assembly of the optical system of embodiment 4 are identical to those of the optical system of embodiment 3, respectively, and their basic parameters are shown in tables 5 to 6, and are not repeated.

Table 8 shows basic parameters of the lens barrel and the spacer of the optical system of example 4, and each parameter in table 8 is in millimeters (mm).

Parameter name	Example 4
		d1s(mm)	38.52
d1m(mm)	39.24
		D1s(mm)	40.67
D1m(mm)	41.49
		d0s(mm)	34.07
D0s(mm)	41.97
		D0m(mm)	46.26
EP01(mm)	1.72
		CP1(mm)	2.16
d01s(mm)	35.30
		D01s(mm)	40.50
EP001(mm)	1.40
		L(mm)	10.43

TABLE 8

Fig. 6A shows on-axis chromatic aberration curves of the optical systems of embodiment 3 and embodiment 4, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows astigmatism curves of the optical systems of example 3 and example 4, which represent meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows distortion curves of the optical systems of example 3 and example 4, which represent distortion magnitude values corresponding to different half angles of view. As can be seen from fig. 6A to 6C, the optical systems given in embodiment 3 and embodiment 4 can achieve good imaging quality.

Example 5

Fig. 7A shows a schematic structural diagram of an optical system according to embodiment 5 of the present application. As shown in fig. 7A, the optical system includes: the lens assembly includes a first lens E1, a second lens E2, and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP disposed on a first side of the second lens, a quarter wave plate QWP disposed on a second side of the second lens, and a partially reflective layer BS disposed on a second side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

Table 9 shows basic parameters of the optical system of example 5, in which the unit of radius of curvature and thickness are both millimeters (mm). Table 9 only exemplifies the correspondence between the surface numbers of the partial surfaces and the partial elements, and the positions of the common surfaces in table 9 are inconvenient to mark all the elements due to the problem of the common surfaces of the bonding between the adjacent elements.

TABLE 9

For example, when the optical system is applied to, for example, a VR device, the first side may, for example, be the human eye side and the second side may, for example, be the display side or the image source side. Referring to table 9, the receiving part may be a human eye and the transmitting part may be a display screen. The light from the emitting portion sequentially passes through the third lens E3, the quarter wave plate QWP, the second lens E2, and the reflective polarizing element RP, is reflected at the reflective polarizing element RP and passes through the second lens E2, the quarter wave plate QWP, and the third lens E3 again, and then the light beam is reflected again at the partially reflective layer BS on the second side surface S6 of the third mirror E3 and passes through the third lens E3, the quarter wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 in this order, passes through the aperture stop STO, and finally exits toward the human eye side. In an exemplary embodiment, the partially reflective layer may be a semi-transparent and semi-reflective film layer plated on the second side S6 of the third mirror E3.

In embodiment 5, the first side surface S1 and the second side surface S2 of the first lens E1, the first side surface S3 of the second lens E2, and the second side surface S6 of the third lens E3 are aspherical surfaces, wherein each aspherical surface profile can be defined by the formula (1) given in embodiment 1 above. Table 10 shows cone coefficients and higher order coefficients A for each of the aspherical mirror surfaces S1-S3 and S6 usable in example 5 ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Face number	Coefficient of taper	A4	A6	A8	A10
						S1	0.0000	-4.16E-05	5.10E-08	-6.30E-10	0.00E+00
S2	0.0000	-4.58E-05	5.48E-09	-3.75E-10	1.64E-13
						S3	0.0000	6.72E-06	-1.06E-08	2.92E-11	-6.02E-14
S6	0.0000	3.59E-06	-5.83E-10	-6.79E-12	0.00E+00

Table 10

Table 11 shows basic parameters of the lens barrel and the spacer of the optical system of example 5, and each parameter in table 11 is in millimeters (mm).

Parameter name	Example 5
		d1s(mm)	37.00
d1m(mm)	37.00
		D1s(mm)	44.32
D1m(mm)	44.32
		d0s(mm)	25.63
D0s(mm)	33.09
		D0m(mm)	47.70
EP01(mm)	1.64
		CP1(mm)	0.10
d01s(mm)	26.92
		D01s(mm)	31.83
EP001(mm)	1.40
		L(mm)	15.79

TABLE 11

Example 6

Fig. 7B shows a schematic structural diagram of an optical system according to embodiment 6 of the present application.

As shown in fig. 7B, the optical system of embodiment 6 includes a lens barrel P0, and a lens assembly, a reflective assembly and at least one spacer disposed in the lens barrel P0, wherein the lens assembly includes a first lens E1, a second lens E2 and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP disposed on a first side of the second lens, a quarter wave plate QWP disposed on a second side of the second lens, and a partially reflective layer BS disposed on a second side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

The lens assembly and the reflecting assembly of the optical system of embodiment 6 are identical to those of the optical system of embodiment 5, respectively, and the basic parameters thereof are shown in tables 9 to 10, and are not repeated.

Table 12 shows basic parameters of the lens barrel and the spacer of the optical system of example 6, and each parameter in table 12 is in millimeters (mm).

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Table 12

Fig. 8A shows on-axis chromatic aberration curves of the optical systems of embodiment 5 and embodiment 6, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows astigmatism curves of the optical systems of example 5 and example 6, which represent meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows distortion curves of the optical systems of example 5 and example 6, which represent distortion magnitude values corresponding to different half angles of view. As can be seen from fig. 8A to 8C, the optical systems given in embodiment 5 and embodiment 6 can achieve good imaging quality.

Example 7

Fig. 9A shows a schematic structural view of an optical system according to embodiment 7 of the present application. As shown in fig. 9A, the optical system includes: the lens assembly includes a first lens E1, a second lens E2, and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP and a quarter wave plate QWP disposed on the first side of the second lens, and a partially reflective layer BS disposed on the first side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

In an exemplary embodiment, the reflective polarizing element and the quarter wave plate are combined, and through a primary attaching process, instead of two attaching processes, the angle position error caused by attaching is reduced, and the imaging quality is improved.

Table 13 shows basic parameters of the optical system of example 7, in which the unit of the radius of curvature and the thickness are both millimeters (mm). Table 13 only exemplifies the correspondence between the surface numbers of the partial surfaces and the partial elements, and the positions of the common surfaces in table 13 are inconvenient to mark all the elements due to the problem of the common surfaces of the adjacent elements.

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TABLE 13

For example, when the optical system is applied to, for example, a VR device, the first side may, for example, be the human eye side and the second side may, for example, be the display side or the image source side. Referring to table 13, the receiving part may be a human eye and the transmitting part may be a display screen. The light from the emitting portion sequentially passes through the third lens E3, the second lens E2, the quarter wave plate QWP, reaches the reflective polarizing element RP, is reflected at the reflective polarizing element RP and passes through the quarter wave plate QWP, the second lens E2 again, and then the light beam is reflected again at the partially reflective layer BS on the first side surface S5 of the third mirror E3 and passes through the second lens E2, the quarter wave plate QWP, the reflective polarizing element RP, and the first lens E1 in this order, passes through the aperture stop STO and finally exits toward the human eye side. In an exemplary embodiment, the partially reflective layer may be a semi-transparent and semi-reflective film layer plated on the first side S5 of the third mirror E3.

In embodiment 7, the first side surface S1 and the second side surface S2 of the first lens E1, the first side surface S3 of the second lens E2, and the second side surface S6 of the third lens E3 are aspherical surfaces, wherein each aspherical surface profile can be defined by the formula (1) given in embodiment 1 above. Table 14 shows cone coefficients and higher order term coefficients A for each of the aspherical mirror surfaces S1-S3 and S6 usable in example 7 ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Face number	Coefficient of taper	A4	A6	A8	A10
						S1	0.0000	-9.66E-05	4.68E-07	-9.35E-10	0.00E+00
S2	0.0000	-8.03E-05	-1.01E-07	3.44E-09	-2.45E-11
						S3	0.0000	-3.75E-06	1.61E-08	-1.31E-11	-1.75E-15
S6	-556.1512	0.00E+00	1.88E-06	7.97E-10	-3.27E-12

TABLE 14

Table 15 shows basic parameters of the lens barrel and the spacer of the optical system of example 7, and each parameter in table 15 is in millimeters (mm).

Parameter name	Example 7
		d1s(mm)	47.03
d1m(mm)	47.03
		D1s(mm)	53.14
D1m(mm)	53.14
		d0s(mm)	26.42
D0s(mm)	33.53
		D0m(mm)	57.44
EP01(mm)	1.20
		CP1(mm)	0.10
d01s(mm)	27.35
		D01s(mm)	31.73
EP001(mm)	1.40
		L(mm)	23.45

TABLE 11

Example 8

Fig. 9B shows a schematic structural view of an optical system according to embodiment 8 of the present application.

As shown in fig. 9B, the optical system of embodiment 8 includes a lens barrel P0, and a lens assembly, a reflective assembly and at least one spacer disposed in the lens barrel P0, wherein the lens assembly includes a first lens E1, a second lens E2 and a third lens E3 sequentially from a first side to a second side along an optical axis. The reflection assembly may include a reflective polarizing element RP and a quarter wave plate QWP disposed on the first side of the second lens, and a partially reflective layer BS disposed on the first side of the third lens. The at least one spacer includes a first spacer P1 disposed between and in contact with the first lens and a second lens, and the at least one spacer further includes a second spacer P01 disposed between the lens barrel and a first side of the first lens. The spacer can block the superfluous light from entering the outside, so that the lens and the lens barrel are better supported, and the structural stability of the optical system is enhanced.

The lens assembly and the reflecting assembly of the optical system of embodiment 8 are identical to those of the optical system of embodiment 7, respectively, and the basic parameters thereof are shown in tables 9 to 10, and are not repeated.

Table 12 shows basic parameters of the lens barrel and the spacer of the optical system of example 8, and each parameter in table 12 is in millimeters (mm).

Parameter name	Implementation of the embodimentsExample 8
		d1s(mm)	47.03
d1m(mm)	47.03
		D1s(mm)	52.25
D1m(mm)	52.25
		d0s(mm)	26.02
D0s(mm)	33.53
		D0m(mm)	56.94
EP01(mm)	1.07
		CP1(mm)	0.10
d01s(mm)	26.83
		D01s(mm)	31.73
EP001(mm)	1.53
		L(mm)	23.45

Table 12

Fig. 10A shows on-axis chromatic aberration curves of the optical systems of embodiment 7 and embodiment 8, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves of the optical systems of examples 7 and 8, which represent meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows distortion curves of the optical systems of example 7 and example 8, which represent distortion magnitude values corresponding to different half angles of view. As can be seen from fig. 10A to 10C, the optical systems given in embodiment 7 and embodiment 8 can achieve good imaging quality.

In summary, the optical systems of embodiments 1 to 8 satisfy the relationship shown in table 13.

Condition/example	1	2	3	4	5	6	7	8
									d1m/(D1m-d1m)	15.77	10.67	16.34	17.42	5.06	4.86	7.70	9.01
(L-EP01-CP1)/(CT2+CT3)	0.91	1.29	0.72	0.71	1.42	1.42	1.55	1.56
									d1s/(N1×CT1)	6.28	6.67	15.25	15.25	3.73	3.73	5.72	5.72
L/(T12+T23)	14.39	14.44	11.59	11.59	17.55	17.55	23.34	23.34
									(D1s-d1s)/CT1	0.70	0.95	1.58	1.27	1.09	1.14	1.10	0.94
D1m/(N2×CT2+N3×CT3)	4.09	4.33	2.92	2.91	2.85	2.87	2.37	2.33
									TD/(D0m-D0s)	2.25	1.99	3.49	2.72	1.18	1.45	0.87	0.89
EP01/CT1	0.40	0.43	0.91	1.02	0.24	0.24	0.22	0.19
									CP1/T12	3.83	0.14	3.12	3.08	0.14	0.14	0.10	0.10
d0s/d1s	0.93	0.89	0.90	0.88	0.69	0.69	0.56	0.55
									(D0s-d0s)/(D01s-d01s)	2.05	2.10	1.39	1.52	1.52	1.49	1.63	1.53
CT1/EP001	2.74	2.74	1.21	1.21	4.77	4.77	3.96	3.62

TABLE 13

The application also provides a VR device, which includes the optical system and the transmitting part provided by any one of the above embodiments. The transmitting section is configured to transmit an optical signal, which may include image information. The optical system is arranged in the light emitting direction of the emitting part, and the third lens is arranged closer to the emitting part than the first lens, and the optical system is used for modulating and transmitting the light signals emitted by the emitting part to human eyes.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. An optical system, comprising: the lens barrel and the lens component arranged in the lens barrel, wherein,

The lens assembly sequentially comprises from a first side to a second side along an optical axis: a first lens, a second lens and a third lens;

the lens barrel has a front end face facing the first side and a rear end face facing the second side;

the second side surface of the second lens is a plane;

the first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface;

the air interval T23 of the second lens and the third lens on the optical axis satisfies: t23 is more than or equal to 0mm and less than or equal to 0.02mm; and

an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and a maximum height L of the lens barrel in the optical axis direction satisfy: 11.0 < L/(T12+T23) < 24.0.

2. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

the at least one spacer includes a first spacer disposed between and in contact with the first lens and the second lens; wherein,

an outer diameter D1m of the second side surface of the first spacer and an inner diameter D1m of the second side surface of the first spacer satisfy: 4.5 < D1 m/(D1 m-D1 m) < 17.5.

3. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

the maximum height L of the lens barrel along the optical axis direction, the distance EP01 between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction, the maximum thickness CP1 of the first spacer along the optical axis direction, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 0.7 < (L-EP 01-CP 1)/(CT2+CT3) < 1.6.

4. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

an inner diameter d1s of the first side surface of the first spacer, a refractive index N1 of the first lens, and a center thickness CT1 of the first lens on the optical axis satisfy: 3.5 < d1 s/(N1×CT1) < 15.5.

5. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

an outer diameter D1s of the first side surface of the first spacer, an inner diameter D1s of the first side surface of the first spacer, and a center thickness CT1 of the first lens on the optical axis satisfy: 0.5 < (D1 s-D1 s)/CT 1 < 1.6.

6. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

an outer diameter D1m of the second side surface of the first spacer, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 2.0 < D1 m/(N2×CT2+N3×CT3) < 4.5.

7. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

the distance EP01 between the front end surface of the lens barrel and the first side surface of the first spacer along the optical axis direction and the center thickness CT1 of the first lens on the optical axis satisfy the following conditions: EP01/CT1 is more than 0.1 and less than 1.1.

8. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

the maximum thickness CP1 of the first spacer in the optical axis direction and the air interval T12 of the first lens and the second lens on the optical axis satisfy: CP1/T12 is more than or equal to 0 and less than 4.0.

9. The optical system of claim 1, further comprising at least one spacer disposed within the barrel;

an inner diameter d0s of the front end surface of the lens barrel and an inner diameter d1s of the first side surface of the first spacer satisfy: 0.5 < d0s/d1s < 1.0.

10. A VR device comprising:

the optical system of any one of claims 1 to 9; and

a transmitting section for transmitting an optical signal including image information;

the optical system is arranged in the light emitting direction of the emitting part, the third lens is arranged closer to the emitting part than the first lens, and the optical system is used for modulating and transmitting the light signals emitted by the emitting part to human eyes.