CN214540203U - Optical imaging lens group, scanning display device and near-to-eye display equipment - Google Patents
Optical imaging lens group, scanning display device and near-to-eye display equipment Download PDFInfo
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- CN214540203U CN214540203U CN202023092553.4U CN202023092553U CN214540203U CN 214540203 U CN214540203 U CN 214540203U CN 202023092553 U CN202023092553 U CN 202023092553U CN 214540203 U CN214540203 U CN 214540203U
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Abstract
The embodiment of the utility model discloses an optical imaging lens group, a scanning display device and a near-to-eye display device, wherein the optical imaging lens group comprises a first lens to a sixth lens which are arranged in sequence from a first side to a second side coaxial axis; focal lengths of the first lens to the sixth lens from the first side to the second side are positive, negative, positive and negative in sequence; the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a convex surface; a first side surface of the second lens is concave at a paraxial region, and a second side surface of the second lens is convex; the second side surface of the third lens is a concave surface; the second side surface of the fourth lens is a convex surface; the second side surface of the fifth lens is a convex surface; the first side surface of the sixth lens element is convex and the second side surface of the sixth lens element is concave at paraxial region.
Description
Technical Field
The utility model relates to a scanning display technology field, concretely relates to optical imaging mirror group, scanning display device and near-to-eye display device.
Background
Scanning display imaging is a new display technology, and can be used for various application scenes such as projection display, near-eye display and the like.
Particularly for the application scene of near-eye display, along with the requirements of miniaturization, portability and imaging definition of near-eye display equipment are continuously improved, the requirements of the near-eye display equipment on wide viewing angle, high resolution and miniaturization of an optical imaging lens group are also increasingly stringent. Therefore, it is an urgent need in the art to provide a miniaturized optical lens assembly with high imaging quality for use in a near-eye display scene.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical imaging mirror group, scanning display device and near-to-eye display device to satisfy near-to-eye display scene crowning formation of image quality, miniaturized requirement.
The embodiment of the utility model provides an optical imaging lens group, which comprises a first lens to a sixth lens which are arranged in sequence from a first side to a second side in a coaxial manner,
focal lengths of the first lens to the sixth lens from the first side to the second side are positive, negative, positive and negative in sequence;
the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a convex surface; a first side surface of the second lens is concave at a paraxial region, and a second side surface of the second lens is convex; the second side surface of the third lens is a concave surface; the second side surface of the fourth lens is a convex surface; the second side surface of the fifth lens is a convex surface; the first side surface of the sixth lens element is convex and the second side surface of the sixth lens element is concave at paraxial region.
Optionally, the first side surface of the third lens is planar or convex.
Optionally, the first side surface of the fourth lens is planar or convex.
Optionally, the fifth lens is a lenticular lens.
Optionally, the focal lengths of the first to sixth lenses satisfy:
1.5<f1/f<3，
7<f2/f<9，
0.5<|f3/f|<1.5，
1<f4/f<2，
1<f5/f<1.5，
1<|f6/f|<1.5，
wherein f is an equivalent focal length of the optical imaging lens group, f1 is a focal length of the first lens element, f2 is a focal length of the second lens element, f3 is a focal length of the third lens element, f4 is a focal length of the fourth lens element, f5 is a focal length of the fifth lens element, and f6 is a focal length of the sixth lens element.
Optionally, the refractive indices of the first lens to the sixth lens satisfy:
1.5<n1<1.7，
1.5<n2<1.8，
1.85<n3<2.0，
1.7<n4<1.9，
1.65<n5<1.8，
1.8<n6<2.0，
wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, and n6 is a refractive index of the sixth lens.
Optionally, the overall length of the optical imaging lens group is less than or equal to 15 mm.
The embodiment of the present invention further provides a scanning display device, which includes an optical fiber scanner and the optical imaging lens assembly, wherein the optical fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging lens assembly is used for magnifying, imaging and projecting a scanning surface corresponding to the light emitted by the optical fiber scanner;
the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, wherein a part of the optical fiber, which exceeds the actuator, forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to perform two-dimensional scanning.
The embodiment of the utility model provides an in still provide a near-to-eye display device, as wear-type augmented reality equipment, include aforementioned scanning display device and near-to-eye display module assembly at least, scanning display device set up in the near-to-eye display module assembly.
The embodiment of the utility model provides an in still provide a near-to-eye display device, be used as wear-type virtual reality equipment, include aforementioned scanning display device and near-to-eye display module assembly at least, scanning display device set up in the near-to-eye display module assembly
Adopt the embodiment of the utility model provides an in technical scheme can realize following technological effect:
the embodiment of the utility model provides an in, carry out reasonable optimization setting through face type, the focus of six with optical axis lenses to optical imaging mirror group, the produced aberration of lens is slowed down to the focal power of dispersion system that can be reasonable to can use less lens, rectify multiple aberration, realize the clear formation of image to the square curved surface. Meanwhile, the whole length of the optical imaging lens group is smaller than or equal to 15mm, and the equivalent focal length of the optical imaging lens group is designed to be 3mm, so that the imaging requirement of high resolution can be met while the miniaturization of the system is realized. In particular, the eyepiece lens is preferably applicable to a near-eye display device which is reduced in size and weight and requires an increasing demand for image sharpness.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIGS. 1a and 1b are schematic structural views of an illustrative scanning display system;
fig. 2 is a schematic diagram of a scanning output of an optical fiber scanner provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optical imaging lens assembly according to an embodiment of the present invention;
fig. 4 is a MTF graph of an optical imaging lens assembly according to an embodiment of the present invention;
fig. 5 is a graph of field curvature distortion of an optical imaging lens assembly according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Illustrative scanning display system
For current Scanning Display imaging, the Scanning Display imaging can be realized by a Digital Micromirror Device (DMD) and a Fiber Scanning Display (FSD) Device. The FSD scheme is used as a novel scanning display imaging mode, and the scanning output of images is realized through an optical fiber scanner. In order to make the solution of the present invention clearly understandable to those skilled in the art, the following is a brief description of the principles of fiber scanning imaging and corresponding systems.
As shown in fig. 1a, an illustrative scanning display system according to the present invention mainly includes:
the laser system comprises a processor 100, a laser group 110, a fiber scanner 120, a transmission fiber 130, a light source modulation circuit 140, a scanning driving circuit 150 and a beam combining unit 160. Wherein the content of the first and second substances,
the processor 100 may be a Graphics Processing Unit (GPU), a Central Processing Unit (CPU), or other chips or circuits having a control function and an image Processing function, and is not limited in particular.
When the system works, the processor 100 may control the light source modulation circuit 140 to modulate the laser group 110 according to image data to be displayed, where the laser group 110 includes a plurality of monochromatic lasers, and the lasers emit light beams of different colors respectively. As shown in fig. 1, three-color lasers of Red (R), Green (G) and Blue (B) can be specifically used in the laser group. The light beams emitted by the lasers in the laser group 110 are combined into a laser beam by the beam combining unit 160 and coupled into the transmission fiber 130.
The processor 100 can also control the scan driving circuit 150 to drive the fiber scanner 120 to scan out the light beam transmitted in the transmission fiber 130.
The light beam scanned and output by the fiber scanner 120 acts on a certain pixel point position on the medium surface, and forms a light spot on the pixel point position, so that the pixel point position is scanned. Driven by the optical fiber scanner 120, the output end of the transmission optical fiber 130 scans according to a certain scanning track, so that the light beam moves to the corresponding pixel point position. During actual scanning, the light beam output by the transmission fiber 130 will form a light spot with corresponding image information (e.g., color, gray scale or brightness) at each pixel location. In a frame time, the light beam traverses each pixel position at a high enough speed to complete the scanning of a frame of image, and because the human eye observes the object and has the characteristic of 'visual residual', the human eye cannot perceive the movement of the light beam at each pixel position but sees a frame of complete image.
With continued reference to fig. 1b, a specific structure of the fiber scanning module 120 is shown, which includes: scanning actuator 121, fiber suspension 122, mirror group 123, scanner package 124 and fixing member 125. The scanning actuator 121 is fixed in the scanner package 124 through a fixing member 125, the transmission fiber 130 extends at the front end of the scanning actuator 121 to form a fiber suspension arm 122 (also called as a scanning fiber), when in operation, the scanning actuator 121 is driven by a scanning driving signal, the slow axis 121a (also called as a first actuating portion) of the scanning actuator 121 vibrates along a vertical direction (the vertical direction is parallel to the Y axis in the reference coordinate system in fig. 1a and 1b, in the present invention, the vertical direction is also called as a first direction), the fast axis 121b (also called as a second actuating portion) vibrates along a horizontal direction (the horizontal direction is parallel to the X axis in the reference coordinate system in fig. 1a and 1b, in the present invention, the horizontal direction is also called as a second direction), and is driven by the scanning actuator 121, the front end of the fiber suspension arm 122 performs two-dimensional scanning according to a preset track and emits a light beam, the emergent light beams can pass through the lens assembly 123 to realize scanning and imaging. In general, the structure formed by the scan actuator 121 and the fiber suspension 122 can be referred to as: an optical fiber scanner.
As shown in fig. 2, in the embodiment of the present invention, through the movement of the fast and slow axes, the movement track of the light-emitting end of the optical fiber forms a scanning curved surface 230, and after passing through the corresponding lens group 123, the scanning curved surface is converted into an imaging plane 240. When applied in a near-eye display device such as an Augmented Reality (AR) device, the imaging plane 240 couples the entrance pupil as a waveguide into the waveguide for imaging for viewing by the human eye.
For convenience of description and to make those skilled in the art easily understand the solution of the present invention, it should be noted that the optical imaging lens assembly (such as the lens assembly 123 shown in fig. 2) in the present invention can be used as an eyepiece, and under the action of the optical imaging lens assembly, the scanning curved surface 230 can be converted into the imaging plane 240 (in practical application, the transmission direction of light is from the scanning curved surface 230 to the imaging plane 240), so that one side of the optical imaging lens assembly corresponding to the imaging plane 240 is referred to as a first side, and one side of the optical imaging lens assembly corresponding to the scanning curved surface 230 is referred to as a second side. In the following, embodiments of the optical imaging lens group will be described with reference to "the first side" and "the second side". Also, in the description of the subsequent embodiments, such as for a certain lens in the optical imaging lens group, the "first side surface of the X-th lens" refers to a surface of the X-th lens facing the first side.
Optical imaging lens group
Fig. 3 is a schematic structural diagram of an optical imaging lens assembly according to an embodiment of the present invention. The optical imaging lens group comprises a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15 and a sixth lens 16 which are coaxially arranged in sequence from a first side (i.e. the side where the imaging plane 01 in fig. 3 is located) to a second side (i.e. the side where the scanning curved surface 02 in fig. 3 is located).
In the present embodiment, each two adjacent lenses of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, and the sixth lens 16 have a space therebetween, that is, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, and the sixth lens 16 are six single non-cemented lenses.
The focal lengths of the first lens 11 to the sixth lens 16 from the first side to the second side are positive, negative, positive, and negative in sequence.
The first lens 11 is a biconvex lens, i.e., its first and second side surfaces are convex.
The second lens element 12 is a positive meniscus lens element, and the first side surface of the second lens element 12 is concave at the paraxial region and the second side surface is convex.
The first side surface of the third lens 13 is a flat surface, and the second side surface is a concave surface.
The first side surface of the fourth lens element 14 is a flat surface, and the second side surface is a convex surface.
The fifth lens 15 is a biconvex lens.
The sixth lens element 16 is a negative meniscus lens element, and the first side surface of the sixth lens element 16 is convex and the second side surface is concave at a paraxial region.
In the embodiment of the present invention, the overall length L of the optical imaging lens group is less than or equal to 15 mm. It should be noted that the overall length of the optical imaging lens group is the maximum length from the first side surface of the first lens element to the second side surface of the sixth lens element. In some embodiments, the surface shape of the lens is not concave or convex on the entire side, and the surface shape of the lens may be a compound curve, or a curve near the optical axis and a non-curve on the edge (refer to the sixth lens element 16 in fig. 3), so that the calculation of the total length of the imaging lens assembly requires the calculation of the maximum length from the first side surface of the first lens element to the second side surface of the sixth lens element.
In the embodiment of the present invention, the first side surface is a convex surface, which means that the first side surface forms a convex shape toward the first side direction of the optical imaging lens group; the first side surface is a concave surface, which means that the first side surface forms a concave shape towards the first side direction of the optical imaging lens group; the second side surface is a convex surface, which means that the second side surface forms a convex shape towards the second side direction of the optical imaging lens group; the second side surface is a concave surface, which means that the second side surface forms a concave shape towards the second side direction of the optical imaging lens group.
In the present embodiment, the focal lengths of the first lens element 11 to the sixth lens element 16 in the optical imaging lens group satisfy the following relations:
1.5<f1/f<3，
7<f2/f<9，
0.5<|f3/f|<1.5，
1<f4/f<2，
1<f5/f<1.5，
1<|f6/f|<1.5，
wherein f is an equivalent focal length of the optical imaging lens assembly, f1 is a focal length of the first lens element 11, f2 is a focal length of the second lens element 12, f3 is a focal length of the third lens element 13, f4 is a focal length of the fourth lens element 14, f5 is a focal length of the fifth lens element 15, and f6 is a focal length of the sixth lens element 16.
The refractive indexes of the first lens 11 to the sixth lens 16 in the optical imaging lens group satisfy the following conditions:
1.5<n1<1.7，
1.5<n2<1.8，
1.85<n3<2.0，
1.7<n4<1.9，
1.65<n5<1.8，
1.8<n6<2.0。
where n1 to n6 represent refractive indices of the first lens 11 to the sixth lens 16, respectively.
The embodiment of the utility model provides an in, through the setting to the focus of each lens in the total six lenses of optical imaging group, multiple aberration is rectified to the focal power that can reasonable disperse system to can use less lens quantity, realize under the prerequisite of guaranteeing small-size the clear formation of image to the square curved surface.
The embodiment of the utility model provides an among the optical imaging group, the material of lens can be glass, plastics or other materials. Preferably, the lens is made of glass, so that the degree of freedom of the refractive power configuration can be increased. In this embodiment, glass is mainly used as an example for lenses in the optical imaging lens group, and glasses with different refractive indexes can be used for different lenses in the optical imaging lens group.
In this embodiment, the equivalent focal length of the optical imaging lens group is 3mm, and the preferred parameters of the curvature radius, the thickness parameter and the refractive index of each lens for imaging a scanning curved surface (taking a spherical surface as an example) are shown in table 1:
TABLE 1
In table 1, the total optical length of the optical imaging lens assembly, i.e. the distance between the image plane 01 and the second side surface of the sixth lens element 16, is 12.852mm, and each of the lens elements is made of glass and is a ball lens. The design of the ball lens is beneficial to the processing of the lens; in practice, aspheric lenses may also be used, with the relevant parameters or proportions still satisfying the foregoing. The optical surface with "infinite" radius of curvature in the imaging plane 01 is referred to as a plane.
Wherein L1 is the distance from the imaging plane 01 to the first side surface of the first lens 11, L2 is the thickness of the first lens 11, and L3 is the distance from the second side surface of the first lens 11 to the first side surface of the second lens 12 on the optical axis; l4 is the thickness of the second lens 12, and L5 is the separation distance on the optical axis from the second side surface of the second lens 12 to the first side surface of the third lens 13; l6 is the thickness of the third lens 13, and L7 is the separation distance on the optical axis from the second side surface of the third lens 13 to the first side surface of the fourth lens 14; l8 is the thickness of the fourth lens 14, and L9 is the separation distance on the optical axis from the second side surface of the fourth lens 14 to the first side surface of the fifth lens 15; l10 is the thickness of the fifth lens 15, and L11 is the separation distance on the optical axis from the second side surface of the fifth lens 15 to the first side surface of the sixth lens 16; l12 is the thickness of the sixth lens 16; l13 is the distance between the second side surface of the sixth lens 16 and the optical axis of the curved scanning surface 02.
Through tests, when the optical imaging lens group is adopted to project image light corresponding to a scanning surface, an optical transfer function curve graph is shown in fig. 4, and a field curvature distortion curve graph is shown in fig. 5; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, and the field distortion curve represents the F-tan (theta) distortion value (percentage) under different field angles.
As can be seen from the MTF curve of the optical imaging lens group shown in fig. 4: the MTF at the center at 200lp/mm is more than 0.5, the MTFs at the edges at 200lp/mm are all more than 0.3, and the imaging resolution is good in the full-field range. As can be seen from the field curvature distortion curve shown in fig. 5: the distortion value of the optical system of the optical imaging lens group is less than 2%, and the distortion is good in the full view field range, so that the optical imaging lens group can clearly image the scanning curved surface image of the optical fiber scanner, and the optical imaging lens group has a good imaging effect.
Certainly, in practical applications, the optical imaging lens assembly may further include a photosensitive element, a housing, and the like, the photosensitive element may be disposed at the second side of the optical imaging lens assembly, and the optical imaging lens assembly may be mounted in the housing, so that a curved image formed by scanning an image source (such as an optical fiber scanner) may be imaged on a plane, thereby realizing clear imaging.
Scanning display device
Aforementioned optical imaging mirror group can cooperate optical fiber scanner (or corresponding optical fiber scanning module), constitutes the embodiment of the utility model provides a scanning display device (as shown in fig. 1a, 1b, optical imaging mirror group sets up in optical fiber scanner's light-emitting light path), wherein, optical imaging mirror group's first side is towards optical fiber scanner scanning light-emitting direction, and preferred mode is optical imaging mirror group and optical fiber scanner center optical axis coaxial. Of course, reference may be made to the corresponding contents in fig. 1a and 1b for the structure and the general principle of the fiber scanner, and redundant description is omitted here.
Near-to-eye display device
The utility model discloses in, scanning display device can further be applied to among the near-to-eye display device, can cooperate near-to-eye display module group to constitute the near-to-eye display device in the embodiment of the utility model provides an as head-mounted AR equipment (e.g.: AR glasses). The scanning display device is arranged in the near-eye display module.
Wherein, can include among the near-to-eye display module assembly: light source, processing control circuit, wearable frame structure, waveguide, etc. The image light beam output by the light source enters the scanning display device, is scanned and output to the optical display mirror group by the optical fiber scanner, the scanning curved surface (refer to the scanning curved surface 02 in fig. 3) of the optical fiber scanner passes through the optical display mirror group and is converted into an imaging plane (refer to the imaging plane 01 in fig. 3), and the imaging plane is coupled into the waveguide as the entrance pupil surface of the waveguide, and then is coupled out through waveguide expansion imaging and enters human eyes.
As another possible implementation, the scanning display device may further cooperate with the near-eye display module to form a near-eye display device in an embodiment of the present invention, which is used as a head-mounted VR device (e.g., VR helmet/glasses). The scanning display device is arranged in the near-eye display module.
What has just been said above is the preferred embodiment of the utility model, and each embodiment only is used for explaining the utility model discloses a technical scheme rather than right the utility model discloses a restriction, all should the technical scheme that the design can obtain through logic analysis, reasoning or effectual experiment that all skilled person in the art is according to the utility model discloses a within the scope.
The embodiment of the utility model provides an in, carry out reasonable optimization setting through face type, the focus of six with optical axis lenses to optical imaging mirror group, the produced aberration of lens is slowed down to the focal power of dispersion system that can be reasonable to can use less lens, rectify multiple aberration, realize the clear formation of image to the square curved surface. Meanwhile, the whole length of the optical imaging lens group is smaller than or equal to 15mm, the focal length of the optical imaging lens group can be designed to be 3mm, the imaging requirement of high resolution can be met while the system is miniaturized, and the optical imaging lens group is suitable for near-eye display equipment which is miniaturized, light and convenient and has continuously improved imaging definition requirements.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment is mainly described as different from the other embodiments.
The expressions "first", "second", "said first" or "said second" used in various embodiments of the present disclosure may modify various components regardless of order and/or importance, but these expressions do not limit the respective components. The above description is only configured for the purpose of distinguishing elements from other elements. For example, the first lens and the second lens represent different lenses, although both are lenses.
Claims (10)
1. An optical imaging lens group, comprising a first lens element to a sixth lens element coaxially disposed in sequence from a first side to a second side,
focal lengths of the first lens to the sixth lens from the first side to the second side are positive, negative, positive and negative in sequence;
the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a convex surface; a first side surface of the second lens is concave at a paraxial region, and a second side surface of the second lens is convex; the second side surface of the third lens is a concave surface; the second side surface of the fourth lens is a convex surface; the second side surface of the fifth lens is a convex surface; the first side surface of the sixth lens element is convex and the second side surface of the sixth lens element is concave at paraxial region.
2. The optical imaging lens assembly of claim 1 wherein the first side surface of the third lens element is flat or convex.
3. The optical imaging lens assembly of claim 1 wherein the first side surface of the fourth lens element is flat or convex.
4. The optical imaging lens assembly of claim 1 wherein the fifth lens element is a biconvex lens element.
5. The optical imaging lens group of claim 1, wherein the focal length of the first lens element to the sixth lens element satisfies:
1.5<f1/f<3，
7<f2/f<9，
0.5<|f3/f|<1.5，
1<f4/f<2，
1<f5/f<1.5，
1<|f6/f|<1.5，
wherein f is an equivalent focal length of the optical imaging lens group, f1 is a focal length of the first lens element, f2 is a focal length of the second lens element, f3 is a focal length of the third lens element, f4 is a focal length of the fourth lens element, f5 is a focal length of the fifth lens element, and f6 is a focal length of the sixth lens element.
6. The optical imaging lens group of claim 1, wherein the refractive index of the first lens element to the sixth lens element satisfies:
1.5<n1<1.7，
1.5<n2<1.8，
1.85<n3<2.0，
1.7<n4<1.9，
1.65<n5<1.8，
1.8<n6<2.0，
wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, and n6 is a refractive index of the sixth lens.
7. The optical imaging lens assembly of claim 1 wherein the overall length of said optical imaging lens assembly is less than or equal to 15 mm.
8. A scanning display device, comprising an optical fiber scanner and the optical imaging lens group of any one of the preceding claims 1 to 7, wherein the optical fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging lens group is used for magnifying, imaging and projecting a scanning surface corresponding to the light emitted by the optical fiber scanner;
the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, wherein a part of the optical fiber, which exceeds the actuator, forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to perform two-dimensional scanning.
9. A near-eye display device, wherein the near-eye display device is used as a head-mounted augmented reality device, and comprises at least the scanning display device according to claim 8 and a near-eye display module, and the scanning display device is disposed in the near-eye display module.
10. A near-eye display apparatus, wherein the near-eye display apparatus is used as a head-mounted virtual reality apparatus, and comprises at least a near-eye display module and the scanning display device according to claim 8, and the scanning display device is disposed in the near-eye display module.
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