CN216485808U - Eyepiece lens and near-to-eye display device - Google Patents
Eyepiece lens and near-to-eye display device Download PDFInfo
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- CN216485808U CN216485808U CN202123236770.0U CN202123236770U CN216485808U CN 216485808 U CN216485808 U CN 216485808U CN 202123236770 U CN202123236770 U CN 202123236770U CN 216485808 U CN216485808 U CN 216485808U
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Abstract
The application discloses eyepiece camera lens and near-to-eye display device. The eyepiece lens comprises a first lens, a second lens, a third lens and a fourth lens which are coaxially arranged in sequence from an object side to an image side. Except that the fourth lens is a plano-convex lens, the other lenses are convex-concave lenses. The focal powers of the four lenses are combined in a positive, negative, positive and positive mode, the volume of the system can be reasonably controlled while the transmission light is optimized, and the lens group is small in volume, light in weight and clear in imaging.
Description
Technical Field
The embodiment of the application relates to the technical field of display, in particular to an eyepiece lens and a near-to-eye display device.
Background
The augmented reality technology (AR for short) realizes real-time synchronization of the virtual world and the real world, meets the requirement that a user really senses things simulated in a virtual space in the real world, and enhances the experience effect of the user.
As a typical field of the fusion and innovation of a new generation of information technology, the AR technology not only displays real world information, but also displays virtual information at the same time, and the two kinds of information are mutually supplemented and superposed. With the gradual maturity of the AR technology, the AR technology will enter a rapid development period with a broad prospect in the fields of industrial application and mass consumption.
In order to realize the AR technology, the existing head-mounted near-to-eye display schemes mainly include an optical waveguide mode, a free-form surface mode, and a prism mode, and the optical waveguide mode gradually becomes a mature technical scheme because the field angles of the free-form surface mode and the prism mode are small. Therefore, the large field angle is realized, various aberrations generated by the optical system are improved, the imaging quality of the system is improved, the user experience is improved, and the like, and the method is particularly important in the wide popularization of the AR technology.
In the prior art, a near-to-eye display optical system adopting the lens group generally needs to be provided with a plurality of lenses, the number of the lenses is large, not only can the processing cost be increased, but also the difficulty of a plurality of optical pieces and structural parts during assembly is large, the production working hours are increased, and the yield of the product quality can be reduced.
SUMMERY OF THE UTILITY MODEL
In view of the above, embodiments of the present disclosure provide an eyepiece lens and a near-to-eye display device.
The application provides an eyepiece lens, which comprises a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence from an object side to an image side in a coaxial manner;
the first lens, the second lens, the third lens and the fourth lens each comprise an object side surface and an image side surface which are opposite to each other, the object side surface is close to the object side, and the image side surface is close to the image side;
the first lens is a convex-concave lens, the object side surface of the first lens at least comprises a concave surface, the image side surface of the first lens is a convex surface, and the first lens is used for providing positive focal power;
the second lens is a convex-concave lens, the object side surface of the second lens at least comprises a concave surface, the image side surface of the second lens is a convex surface, and the second lens is used for providing negative focal power;
the third lens is a convex-concave lens, the object side surface of the third lens at least comprises a concave surface, the image side surface of the third lens is a convex surface, and the third lens is used for providing positive focal power;
the fourth lens is a plano-convex lens, the object side surface of the fourth lens is a plane, the image side surface of the fourth lens is a convex surface, and the fourth lens is used for providing positive focal power.
In one embodiment, the first lens, the second lens, the third lens and the fourth lens are all spherical lenses.
In one embodiment, any one of the first lens, the second lens, the third lens, and the fourth lens is an aspheric lens.
In one embodiment, the object side surfaces of the first lens, the second lens, and the third lens further include a plane.
In one embodiment, the first lens, the second lens, the third lens and the fourth lens are all made of optical glass or optical resin.
In one embodiment, the effective focal length of the eyepiece lens is f, wherein 10mm < f <15 mm.
Based on the same inventive concept, the application further provides a near-to-eye display device, which comprises an image source, an optical waveguide and the eyepiece lens according to any one of the above embodiments, wherein the eyepiece lens is arranged in the light emergent direction of the image source and is coaxial with the image source, and the optical waveguide is arranged in the light emergent direction of the eyepiece lens.
In one embodiment, the image source includes any one of a liquid crystal display, a silicon-based liquid crystal display, an organic light emitting diode, a micro light emitting diode, and a digital micromirror device.
In one embodiment, the image source is sized between 0.2 inches and 0.4 inches.
In one embodiment, the optical waveguide is a geometric array optical waveguide or a grating optical waveguide.
The embodiment of the application provides an eyepiece lens and a near-to-eye display device. The eyepiece lens comprises a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence from the object side to the image side in a coaxial mode. Except that the fourth lens is a plano-convex lens, the other lenses are convex-concave lenses. The focal powers of the four lenses are combined in a positive, negative, positive and positive mode, the volume of the system can be reasonably controlled while the transmission light is optimized, and the lens group is small in volume, light in weight and clear in imaging.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an eyepiece lens provided in an embodiment of the present application;
fig. 2 is a schematic view of an MTF curve of an eyepiece lens provided in an embodiment of the present application at a resolution of 30 lp/mm;
fig. 3 is a schematic view illustrating curvature of field and distortion of an eyepiece lens at a full-field full-waveband in a full field of view according to an embodiment of the present disclosure;
fig. 4 is a full field of view diagram of an eyepiece lens provided in an embodiment of the present application;
fig. 5 is a diagram illustrating an aberration contribution of an eyepiece lens according to an embodiment of the present disclosure;
fig. 6 is a near-eye display device according to an embodiment of the present disclosure.
Description of the reference numerals of the main elements
100. A first lens; 200. a second lens; 300. a third lens; 400. a fourth lens; 500. An image source; 600 optical waveguides.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail through specific embodiments in conjunction with the accompanying drawings in the embodiments of the present application. It is obvious that the described embodiments are a part of the present application, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without inventive work fall within the scope of protection of the present application.
Referring to fig. 1, the present application provides an eyepiece lens. The eyepiece lens includes a first lens 100, a second lens 200, a third lens 300, and a fourth lens 400 arranged in order from an object side to an image side along a common optical axis.
The first lens 100, the second lens 200, the third lens 300, and the fourth lens 400 each include opposing object and image side surfaces. The object side surface is close to the object side, and the image side surface is close to the image side. The first lens 100 is a convex-concave lens. The object side surface of the first lens 100 includes at least one concave surface. The image-side surface of the first lens element 100 is convex. The first lens 100 is used to provide positive optical power. The second lens 200 is a convex-concave lens. The object side surface of the second lens 200 includes at least one concave surface. The image-side surface of the second lens element 200 is convex. The second lens 200 is used to provide negative optical power. The third lens 300 is a convex-concave lens. The object side surface of the third lens 300 includes at least one concave surface. The image-side surface of the third lens element 300 is convex. The third lens 300 is for providing positive optical power. The fourth lens 400 is a plano-convex lens. The object side surface of the fourth lens 400 is a plane. The image-side surface of the fourth lens element 400 is convex. The fourth lens 400 is used to provide positive optical power.
The focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, and characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a certain refractive surface of a lens (i.e. a surface of the lens), a certain lens, or a system formed by a plurality of lenses (i.e. a lens group).
In one embodiment, the materials of the first lens 100, the second lens 200, the third lens 300 and the fourth lens 400 are all optical glass or optical resin.
In one of the embodiments, the effective focal length of the eyepiece lens is f, where 10mm < f <15 mm. The focal length of the eyepiece lens is short, so that the volume and the weight of the optical system can be further reduced, and the cost is reduced.
In one embodiment, any one of the first lens 100, the second lens 200, the third lens 300, and the fourth lens 400 is an aspheric lens.
In one embodiment, the first lens 100, the second lens 200, the third lens 300, and the fourth lens 400 are all spherical lenses. The spherical lens is better than the aspheric lens in image quality, lower in processing difficulty and easy to detect.
Referring to fig. 1, the first lens 100 is a meniscus lens, and is used as a field lens of an optical system, so that the size of all lenses in the optical system can be effectively reduced, light can be made compact, and the volume of the optical system can be reduced.
Referring to fig. 1, the second lens element 200 is a convex-concave lens element with negative focal power, the convex surface of which is close to the image side and mainly contributes to negative spherical aberration, coma, astigmatism and distortion, and the concave surface of which is close to the object side and mainly joins the light emitted from the convex surface of the first lens element 100, so that the light can be corrected more compactly, and the volume of the lens system can be effectively reduced.
Referring to fig. 1, the third lens 300 is a meniscus lens with positive refractive power, the convex surface is close to the image side, and the concave surface is close to the object side, and is mainly used for contributing positive spherical aberration and coma aberration, controlling the spherical aberration and coma aberration of the optical system in a range as small as possible, and improving the imaging quality.
Referring to fig. 1, the fourth lens 400 is a plano-convex lens, and provides a positive optical power to the optical system, and mainly contributes to a positive spherical aberration, coma, astigmatism, and distortion, and can correct aberrations generated by the first lens 100, the second lens 200, and the third lens 300. Because the plano-convex lens is easy to process, the processing cost can be reduced, the assembly of the whole machine is convenient, the assembly precision is easy to ensure, and the volume of the system can be effectively reduced.
The number of the lenses of the eyepiece lens is small, the size of the eyepiece lens is small, and the processing cost and the assembly difficulty can be reduced. Specifically, the first lens 100 can correct the field curvature of light in the optical system and reduce the incident angle of light, and mainly has the effects of improving the imaging definition of the system, increasing the field angle of the system, contributing to reducing the volume of the system lens group, and further reducing the volume and the mass of the whole structure. The second lens 200 mainly functions to provide negative focal power and spherical aberration for the optical system, the third and fourth lenses 400 provide positive focal power for the optical system, and light rays are corrected after passing through the second lens 200, the third lens 300 and the fourth lens 400, all aberrations are almost completely corrected, so that the imaging quality of the system can be greatly improved. The light rays are transmitted by the lens group and then emitted out through the exit pupil position of the optical system, and the image can be received by human eyes.
In this embodiment, the eyepiece lens includes a first lens 100, a second lens 200, a third lens 300, and a fourth lens 400, which are disposed in order from an object side to an image side along a common optical axis. The fourth lens 400 is a plano-convex lens, and the other lenses are convex-concave lenses. The focal powers of the four lenses are combined in a positive, negative, positive and positive mode, the volume of the system can be reasonably controlled while the transmission light is optimized, and the lens group is small in volume, light in weight and clear in imaging.
In one embodiment, the object side surfaces of the first lens 100, the second lens 200, and the third lens 300 further include a flat surface.
Referring to fig. 1, the object side surfaces of the first lens 100, the second lens 200, and the third lens 300 further include a flat surface, which means that the object side surfaces of the three convex-concave lenses are concave surfaces disposed at the middle positions of the entire lenses, and the upper and lower positions of the object side surfaces of the three convex-concave lenses are flat surfaces, that is, the object side surfaces of the three convex-concave lenses are plano-concave-plano surfaces. The structure is convenient to assemble and can improve the yield of the product quality.
Fig. 2 is a schematic view of an MTF curve of an eyepiece lens at a resolution of 30lp/mm, where as shown in fig. 2, the MTF of the eyepiece lens is greater than or equal to 30% of an optical modulation transfer function of a full field at a spatial frequency of 30 lp/mm.
Fig. 3 is a schematic view of curvature of field and distortion of an eyepiece lens in a full-field full-waveband in a full-field according to an embodiment of the present disclosure. Wherein, the left side is a curvature of field diagram, the right side is a distortion diagram, as shown in fig. 3, the curvature of field of the eyepiece lens is controlled within <0.1mm, and the optical distortion is controlled to be less than or equal to 1.5%.
Fig. 4 is a full field of view diagram of an eyepiece lens provided in an embodiment of the present application. The RMS radius is controlled to RMS <10 μm.
Fig. 5 is a diagram illustrating an aberration contribution of an eyepiece lens according to an embodiment of the present disclosure; as can be seen from fig. 5, the overall aberration of the eyepiece lens provided in the embodiment of the present application can be controlled within a very desirable range, so that the system has very good display effect and quality.
Referring to fig. 6, based on the same inventive concept, the present application further provides a near-eye display device, including an image source 500, an optical waveguide 600, and the eyepiece lens according to any one of the above embodiments, the eyepiece lens being disposed in a light-emitting direction of the image source 500 and being coaxial with the image source 500, the optical waveguide 600 being disposed in the light-emitting direction of the eyepiece lens. As shown in fig. 6, the image source 500, the first lens 100, the second lens 200, the third lens 300, the fourth lens 400, and the optical waveguide 600 may be arranged in this order.
In one embodiment, to control the overall volume of the near-eye display device, the image source 500 may select a display source that is as small in volume as possible. The image source 500 includes, but is not limited to, any one of a liquid crystal display, a silicon-based liquid crystal display, an organic light emitting diode, a micro light emitting diode, and a digital micromirror device.
In one embodiment, the image source 500 has a size of 0.2 inch to 0.4 inch, such as 0.23 inch OLED display chip, 0.39 inch OLED display chip.
Light rays are emitted out through the exit pupil position of the optical system after being transmitted by the lens group, the optical waveguide 600 can be arranged at the exit pupil position, the light rays enter the eyes of a user after being transmitted by the optical waveguide 600, and a virtual image is formed in the retina of the eyes of the user for receiving. In other embodiments, the exit pupil position may also be viewed by the eyes of the user, i.e. the light emitted from the optical system can be directly received by the eyes of the human eye to form an image. In one embodiment, the optical waveguide 600 is a geometric array optical waveguide 600 or a grating optical waveguide 600.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. Those skilled in the art will appreciate that the present application is not limited to the specific embodiments described herein, and that the features of the various embodiments of the present application may be partially or fully coupled or combined with each other and may be coordinated with each other and technically driven in various ways. Numerous variations, rearrangements, combinations, and substitutions will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (10)
1. An eyepiece lens includes a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side to an image side;
the first lens, the second lens, the third lens and the fourth lens each include opposite object-side and image-side surfaces, the object-side surface being close to the object side, and the image-side surface being close to the image side;
the first lens is a convex-concave lens, the object side surface of the first lens at least comprises a concave surface, the image side surface of the first lens is a convex surface, and the first lens is used for providing positive focal power;
the second lens is a convex-concave lens, the object side surface of the second lens at least comprises a concave surface, the image side surface of the second lens is a convex surface, and the second lens is used for providing negative focal power;
the third lens is a convex-concave lens, the object side surface of the third lens at least comprises a concave surface, the image side surface of the third lens is a convex surface, and the third lens is used for providing positive focal power;
the fourth lens is a plano-convex lens, the object side surface of the fourth lens is a plane, the image side surface of the fourth lens is a convex surface, and the fourth lens is used for providing positive focal power.
2. An eyepiece lens as recited in claim 1 wherein said first lens, said second lens, said third lens, and said fourth lens are all spherical lenses.
3. An eyepiece lens as recited in claim 1 wherein any of said first lens, said second lens, said third lens and said fourth lens is an aspheric lens.
4. An eyepiece lens as recited in claim 1 wherein the object side surfaces of said first lens, said second lens, and said third lens further comprise a flat surface.
5. An eyepiece lens as recited in claim 1 wherein said first lens, said second lens, said third lens, and said fourth lens are all optical glass or optical resin.
6. An eyepiece lens as claimed in claim 1 wherein the effective focal length of the eyepiece lens is f, wherein 10mm < f <15 mm.
7. A near-eye display device comprising an image source, an optical waveguide and the eyepiece lens of any one of claims 1 to 6, the eyepiece lens being disposed in a light exit direction of the image source while being coaxial with the image source, the optical waveguide being disposed in the light exit direction of the eyepiece lens.
8. A near-eye display device according to claim 7, wherein the image source comprises any one of a liquid crystal display, a liquid crystal on silicon display, an organic light emitting diode, a micro light emitting diode, and a digital micromirror device.
9. The near-eye display device of claim 7, wherein the image source has a size of 0.2 inches to 0.4 inches.
10. The near-eye display device of claim 7, wherein the optical waveguide is a geometric array optical waveguide or a grating optical waveguide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123236770.0U CN216485808U (en) | 2021-12-22 | 2021-12-22 | Eyepiece lens and near-to-eye display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123236770.0U CN216485808U (en) | 2021-12-22 | 2021-12-22 | Eyepiece lens and near-to-eye display device |
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| Publication Number | Publication Date |
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| CN216485808U true CN216485808U (en) | 2022-05-10 |
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| CN202123236770.0U Active CN216485808U (en) | 2021-12-22 | 2021-12-22 | Eyepiece lens and near-to-eye display device |
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| CN (1) | CN216485808U (en) |
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- 2021-12-22 CN CN202123236770.0U patent/CN216485808U/en active Active
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