CN113568144B - Optical imaging lens group, scanning display device and near-eye display equipment - Google Patents

Optical imaging lens group, scanning display device and near-eye display equipment Download PDF

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CN113568144B
CN113568144B CN202110829183.8A CN202110829183A CN113568144B CN 113568144 B CN113568144 B CN 113568144B CN 202110829183 A CN202110829183 A CN 202110829183A CN 113568144 B CN113568144 B CN 113568144B
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lens
optical imaging
scanning
imaging lens
optical
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CN113568144A (en
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请求不公布姓名
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Chengdu Idealsee Technology Co Ltd
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Chengdu Idealsee Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The embodiment of the application discloses an optical imaging lens group, a scanning display device and near-to-eye display equipment, and relates to the technical field of scanning display. The optical imaging lens group can reasonably disperse the focal power of the system by reasonably optimizing the focal lengths of six optical axis lenses of the optical imaging lens group, and slow down the aberration generated by the lenses, thereby achieving the purpose of correcting various aberrations, and further realizing clear imaging of an image side curved surface on the basis of improving the angle of view; the refractive index, the chromatic dispersion coefficient and the surface type structure of the six lenses with the same optical axis are limited and optimized, so that the angle of view and the imaging quality are further improved; the six lens with the same optical axis are limited and optimally designed into an aspheric surface-shaped structure and are made of plastic materials, so that the forming processing difficulty of the whole optical imaging lens group is reduced on the basis of further improving the imaging quality, and the mass production is facilitated at low cost.

Description

Optical imaging lens group, scanning display device and near-eye display equipment
Technical Field
The application relates to the technical field of scanning display, in particular to an optical imaging lens group, a scanning display device and near-to-eye display equipment.
Background
Scanning display imaging is an emerging display technology, and can be used for various application scenes such as projection display, near-eye display and the like.
However, in the existing scanning display imaging system, the defects of high processing difficulty, high mass production cost, poor imaging quality, small view field angle and the like exist, so that the scanning display imaging technology is limited to a certain extent in the market popularization and application process, and particularly when the scanning display imaging is applied to a scene displayed by a near-eye, the scanning display imaging system is limited by the influence of an imaging effect and a view field angle, so that the scanning display imaging system can not meet the performance requirement of high resolution in the near-eye display all the time, and the development of the near-eye display to a consumer market is prevented.
Disclosure of Invention
The present invention provides an optical imaging lens assembly, a scanning display device and a near-eye display device, so as to meet the requirements of large field angle, high imaging quality, easy processing and low cost in a near-eye display scene.
The embodiment of the application provides an optical imaging lens group, optical imaging lens group includes by first side to second side first lens, second lens, third lens, fourth lens, fifth lens and the sixth lens that the optical axis set up altogether in proper order, first lens to the focal length that the sixth lens corresponds is positive, negative, positive and positive respectively.
Optionally, each of the lenses satisfies the following relationship: 1<f 1 /f<3、2<f 2 /f<3、0.2<|f 3 /f|<1、2<f 4 /f、0.5<f 5 /f<1.5 and 1<f 6 /f<3；
Wherein f 1 F is the focal length of the first lens 2 F is the focal length of the second lens 3 F is the focal length of the third lens 4 F is the focal length of the fourth lens 5 F is the focal length of the fifth lens 6 And f is the focal length of the optical imaging lens group.
Optionally, each of the lenses further satisfies the following relationship:
1.5<n1<1.7，1.5<n2<1.7，1.6<n3<1.7，1.5<n4<1.7，1.45<n5<1.6，1.5<n6<1.7；
wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens.
Optionally, n1 is 1.57, n2 is 1.54, n3 is 1.63, n4 is 1.63 or 1.67, n5 is 1.53, and n6 is 1.54;
the dispersion coefficients of the various lenses satisfy: the abbe number of the first lens is 37.7, the abbe number of the second lens is 56.8 or 55.9, the abbe number of the third lens is 23.3, the abbe number of the fourth lens is 23.4 or 19.3, the abbe number of the fifth lens is 55.0, and the abbe number of the sixth lens is 56.8 or 56.0.
Optionally, the first side surface of the sixth lens is convex, and the second side surface of the sixth lens is concave at a paraxial region.
Optionally, the first side surface of the second lens is concave at a paraxial region, and the second side surface of the second lens is convex; the first side surface of the third lens is a concave surface at a paraxial region; the first side surface of the fifth lens is convex, and the second side surface of the fifth lens is convex at a paraxial region.
Optionally, the first side surface and the second side surface of the first lens to the sixth lens are both aspheric surface-shaped structures;
the first lens to the sixth lens are all made of plastic;
the second side of the optical imaging lens group corresponds to the curved surface image, and the first side of the optical imaging lens group corresponds to the plane image.
The embodiment of the application also provides a scanning display device, which comprises an optical fiber scanner and the optical imaging lens group, 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 amplifying, 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 the part of the optical fiber exceeding 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 application also provides near-eye display equipment, which is used as head-mounted augmented reality equipment and at least comprises a near-eye display module and the scanning display device, wherein the scanning display device is arranged in the near-eye display module.
The embodiment of the application further provides near-eye display equipment, which is characterized in that the near-eye display equipment is used as head-mounted virtual reality equipment and at least comprises a near-eye display module and the scanning display device, and the scanning display device is arranged in the near-eye display module.
The following technical effects can be achieved by adopting the technical scheme in the embodiment of the application:
in the embodiment of the application, the focal lengths of the six lens with the same optical axis of the optical imaging lens group are reasonably optimized, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lens is slowed down, the purpose of correcting various aberrations is achieved, and the clear imaging of the curved surface of the image side is realized on the basis of improving the angle of view.
Further, the refractive index, the dispersion coefficient and the surface type structure of the six lenses with the same optical axis are limited and optimized, so that the angle of view and the imaging quality are further improved; the six lens with the same optical axis are limited and optimally designed into an aspheric surface-shaped structure and are made of plastic materials, so that the forming processing difficulty of the whole optical imaging lens group is reduced on the basis of further improving the imaging quality, and the mass production is facilitated at low cost.
Additional features and advantages of the application 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 application. The objectives and other advantages of the application will 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 present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIGS. 1a, 1b are schematic structural diagrams of an illustrative scanning display system;
FIG. 2 is a schematic diagram of a fiber scanner scan output provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of an optical imaging lens assembly according to an embodiment of the present disclosure;
FIG. 4 is a graph of MTF of an optical imaging lens assembly according to an embodiment of the present application;
FIG. 5 is a graph of field curvature distortion of an optical imaging lens assembly according to an embodiment of the present application;
FIG. 6 is an axial chromatic aberration diagram of an optical imaging lens assembly according to an embodiment of the present application;
fig. 7 is a vertical chromatic aberration diagram of an optical imaging lens assembly according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of an optical imaging lens assembly according to a second embodiment of the present disclosure;
FIG. 9 is a graph of MTF for an optical imaging lens set in accordance with embodiment II of the present application;
FIG. 10 is a graph of field curvature distortion of an optical imaging lens assembly according to a second embodiment of the present application;
FIG. 11 is an axial chromatic aberration diagram of an optical imaging lens assembly according to a second embodiment of the present disclosure;
fig. 12 is a vertical axis chromatic aberration diagram of an optical imaging lens assembly in a second embodiment of the present application.
Icon: a 100-processor; 110-a laser group; 120-an optical fiber scanning module; 130-transmission fiber; 140-a light source modulation circuit; 150-a scan driving circuit; 160-a beam combining unit; 121-a scanning actuator; 121 a-slow axis; 121 b-fast axis; 122-fiber cantilever; 123-mirror group; 124-scanner housing; 125-fixing piece; 230-scanning a curved surface; 240-imaging plane; 11-a first lens; 12-a second lens; 13-a third lens; 14-a fourth lens; 15-a fifth lens; 16-a sixth lens; 01-diaphragm; 02-scanning a curved surface; 31-a first lens; 32-a second lens; 33-a third lens; 34-a fourth lens; 35-a fifth lens; 36-a sixth lens; 03-diaphragm; 04-scanning curved surfaces.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Illustrative scanning display System
For current scanning display imaging, this can be achieved by either a digital micromirror device (Digital Micromirror Device, DMD) or a fiber-optic scanning display (Fiber Scanning Display, FSD) device. The FSD scheme is used as a novel scanning display imaging mode, and scanning output of images is realized through an optical fiber scanner. In order to enable those skilled in the art to clearly understand the present application, a brief principle of optical fiber scanning imaging and corresponding system will be described below.
As shown in fig. 1a, an illustrative scanning display system in the present application mainly includes:
processor 100, laser set 110, optical fiber scanning module 120, transmission optical fiber 130, light source modulation circuit 140, scanning driving circuit 150 and beam combining unit 160. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the processor 100 may be a graphics processor (Graphics Processing Unit, GPU), a central processing unit (Central Processing Unit, CPU), or other chip or circuit with control functions, image processing functions, and is not limited in detail herein.
When the system is in operation, the processor 100 can control the light source modulation circuit 140 to modulate the laser set 110 according to the image data to be displayed, wherein the laser set 110 comprises a plurality of monochromatic lasers, and the monochromatic lasers respectively emit light beams with different colors. As can be seen from fig. 1, a Red (Red, R), green (Green, G), blue (Blue, B) trichromatic laser may be used in the laser group. The light beams emitted by the lasers in the laser set 110 are combined into a single laser beam by the beam combining unit 160 and coupled into the transmission fiber 130.
The processor 100 may further control the scan driving circuit 150 to drive the optical fiber scanner in the optical fiber scanning module 120 to scan, thereby scanning and outputting the light beam transmitted in the transmission optical fiber 130.
The light beam scanned by the optical fiber scanner acts on a certain pixel point position on the surface of the medium and forms a light spot on the pixel point position, so that the scanning of the pixel point position is realized. The output end of the transmission optical fiber 130 is scanned according to a certain scanning track under the driving of the optical fiber scanner, so that the light beam moves to the corresponding pixel point position. During the actual scanning process, the light beam output by the transmission fiber 130 will form a spot with corresponding image information (e.g., color, gray scale, or brightness) at each pixel location. In one frame time, the light beam traverses each pixel point position at a high enough speed to complete the scanning of one frame of image, and the human eye can not perceive the movement of the light beam at each pixel point position, but can see one complete frame of image because of the characteristic of 'vision residue' of the human eye observation object.
With continued reference to fig. 1b, a specific structure of the optical fiber scanning module 120 includes: a scan actuator 121, a fiber cantilever 122, a mirror assembly 123, a scanner housing 124, and a fixture 125. The scan actuator 121 is fixed in the scanner package 124 by the fixing member 125, the transmission optical fiber 130 extends at the front end of the scan actuator 121 to form an optical fiber cantilever 122 (may also be referred to as a scan optical fiber), when in operation, the scan actuator 121 is driven by a scan driving signal, the slow axis 121a (also referred to as a first actuating portion) of the scan actuator vibrates along a vertical direction (which is parallel to a Y axis in a reference coordinate system in fig. 1a and 1b, in this application, the vertical direction may also be referred to as a first direction), the fast axis 121b (also referred to as a second actuating portion) vibrates along a horizontal direction (which is parallel to an X axis in a reference coordinate system in fig. 1a and 1b, in this application, the horizontal direction may also be referred to as a second direction), and the front end of the optical fiber cantilever 122 is driven by the scan actuator 121 to perform two-dimensional scanning along a preset track and emit a light beam, and the emitted light beam can pass through the mirror group 123 to realize scanning imaging. Generally, the structure of the scan actuator 121 and the fiber cantilever 122 may be referred to as: an optical fiber scanner.
As shown in fig. 2, in the embodiment of the present application, the motion track of the light emitting end of the optical fiber forms a scan curved surface 230 through the motion of the fast and slow axes, and is converted into an imaging plane 240 after passing through the corresponding lens group 123. When applied in a near-eye display device such as an augmented reality (Augmented Reality, AR) device, the imaging plane 240 will couple into the waveguide as an entrance pupil of the waveguide for imaging for viewing by the human eye.
For convenience of description and to enable those skilled in the art to easily understand the solution of the present application, it should be noted that, by using the optical imaging lens group (such as the lens group 123 shown in fig. 2) as an eyepiece, the scan curved surface 230 can be converted into the imaging plane 240 (in practical application, the transmission direction of the light is the direction from the scan curved surface 230 to the imaging plane 240), so that the optical imaging lens group corresponds to one side of the imaging plane 240, which is referred to herein as a first side, and the optical imaging lens group corresponds to one side of the scan curved surface 230, which is referred to as a second side. In the following, embodiments of the optical imaging lens set will be described with reference to "first side" and "second side". Also, in the description in the following embodiments, such as for a certain lens in the optical imaging lens group, "the first side surface of the X-th lens" refers to the surface of the X-th lens facing the first side.
It should be further noted that, in the projection field, the image corresponding to the first side is a planar image, the corresponding planar image carrier may be, for example, a projection screen, a curtain, a wall surface, etc., and the image corresponding to the second side is a curved image, that is, a scanning surface in an arc shape scanned by the optical fiber scanner or emitted by other image sources; under the field of image pickup, the light path is opposite to that in the projection field, the first side corresponds to an object side surface for collecting image information generally, and the second side corresponds to an image side surface for collecting imaging generally.
Optical imaging lens group
The optical imaging lens group in the embodiment of the application comprises: the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged on the common optical axis from the first side to the second side in sequence, and six lenses are formed. It should be noted that, in the embodiments of the present application, the focal lengths corresponding to the first lens to the sixth lens are positive, negative, positive and positive, respectively. The focal lengths of the six lenses with the same optical axis are reasonably and optimally arranged, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lenses is slowed down, the purpose of correcting various aberrations is achieved, and the clear imaging of the curved surface of the image side is realized on the basis of improving the angle of view. In addition, it is emphasized that the focal length of the sixth lens is set to be positive, and the convergence ability of the curved image can be enhanced to balance aberrations.
More specifically, it is preferable that each lens satisfies the following relation: 1<f 1 /f<3、2<f 2 /f<3、0.2<|f 3 /f|<1、2<f 4 /f、0.5<f 5 /f<1.5 and 1<f 6 /f<3, a step of; wherein f 1 F is the focal length of the first lens 2 F is the focal length of the second lens 3 F is the focal length of the third lens 4 F is the focal length of the fourth lens 5 F is the focal length of the fifth lens 6 And f is the focal length of the optical imaging lens group (may beUnderstood to be the equivalent focal length of the optical imaging lens group). It should be noted that, by defining the focal length of each lens more specifically, the focal power of the system is more reasonably dispersed and configured, so as to further enhance correction of various aberrations and improve the angle of view and imaging quality. In addition, if the area position of the focal length of the lens is not defined in the present embodiment, the focal length of the lens may be the focal length of the lens at the paraxial region. It should be emphasized that prior to the creation of the present invention, the existing optical imaging lens group for projection display cannot achieve the balance between the imaging quality and the large angle of view, i.e. the imaging quality is generally reduced when the angle of view is increased, and the imaging quality cannot be ensured to achieve a larger angle of view. The invention of the application realizes high-quality imaging output while improving the angle of view through the combined control of the focal length and the surface type structure of the six lenses.
Further, in one possible embodiment, the six lenses may be connected by a space, or may be bonded together by an adhesive, which is not limited herein, according to the needs of the practical application.
Further, in one possible embodiment, the above-described various lenses also satisfy the following relation:
1.5< n1<1.7,1.5< n2<1.7,1.6< n3<1.7,1.5< n4<1.7,1.45< n5<1.6,1.5< n6<1.7; wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens. Preferably, n1 is 1.57, n2 is 1.54, n3 is 1.63, n4 is 1.63 or 1.67, n5 is 1.53, and n6 is 1.54. It should be noted that, by limiting the refractive indexes of the six lenses in an optimized design, the dispersion coefficient of the corresponding lens can be reasonably controlled so as to ensure the imaging quality and a large angle of view.
Further optionally, in order to better ensure imaging quality, the embodiment of the present invention also specifically preferably limits the abbe number of the six lenses, specifically defined as: the abbe number of the first lens is 37.7, the abbe number of the second lens is 56.8 or 55.9, the abbe number of the third lens is 23.3, the abbe number of the fourth lens is 23.4 or 19.3, the abbe number of the fifth lens is 55.0, and the abbe number of the sixth lens is 56.8 or 56.0. It should be noted that, in other embodiments of the present invention, the abbe numbers of the six lenses defined in the embodiments of the present invention are not limited, and may be other abbe numbers that can ensure that the six lenses have a good matching relationship, so as to ensure the final imaging quality.
Further optionally, in a possible embodiment, the first side surface of the second lens is concave at a paraxial region and the second side surface of the second lens is convex; the first side surface of the third lens is a concave surface at a paraxial region; the first side surface of the fifth lens is a convex surface, and the second side surface of the fifth lens is a convex surface at a paraxial region; the first side surface of the sixth lens is convex, and the second side surface of the sixth lens is concave at a paraxial region. By limiting the surface-type structure of the corresponding side surface of the lens, the aberration generated between the lenses can be further effectively corrected, the optical sensitivity is reduced, and the final imaging quality and the angle of view are improved. In addition, the first side surface is convex, which means that the first side surface forms a convex shape towards the first side direction of the optical imaging lens group; the first side surface is concave, 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 convex, 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 concave, which means that the second side surface forms a concave shape towards the second side direction of the optical imaging lens group. It should be emphasized that, in other embodiments of the present invention, the planar structures of the second lens, the third lens, the fifth lens and the sixth lens are not limited to the same planar structure as in the present embodiment, but may be limited to only the planar structure of at least one of the lenses, for example, the planar structure of only the first side surface and the second side surface of the sixth lens, and the planar structures of the other lenses are not limited to the planar structure of the other lenses.
Further, in some embodiments, the lens is not concave or convex over its entire side surface, and the lens may be complex curved in shape, or curved in the paraxial region and non-curved in the peripheral region; particularly optionally, when the lens surface is convex and the convex position is not defined, it means that the convex surface may be located at the paraxial region of the lens surface; similarly, when the lens surface is concave and the concave position is not defined, it means that the concave surface may be located at the paraxial region of the lens surface.
Further alternatively, in one possible embodiment, the first side surface and the second side surface of each of the first lens to the sixth lens are aspherical surface-shaped structures. It should be noted that, by designing the mirror structures of the first lens to the sixth lens to be aspheric surface-shaped structures, more control variables can be obtained to reduce aberration and reasonably reduce the number of lenses, so that the miniaturization or microminiaturization of the optical imaging lens group is facilitated on the basis of improving the image display quality. In addition, the first side surface and the second side surface of the lens are both aspheric surface-shaped structures, and it is understood that the entire or a part of the optically effective area of the lens surface is aspheric.
Further alternatively, in one possible embodiment, the first lens to the sixth lens are each made of plastic. It should be noted that, the first lens to the sixth lens made of plastic can effectively reduce the production cost, and compared with the glass material, the cost of the plastic lens is one twentieth to one tenth of the cost of the glass material, so that the low-cost batch production is very favorable; in addition, the lens made of plastic materials can be generally injection molded, the processing difficulty is low, various molded surface structures meeting the requirements of aspheric surfaces can be easily processed, and meanwhile, the weight of the lens can be integrally reduced by the plastic materials, so that the lens is beneficial to the light product design.
In addition, it should be noted that, in the optical imaging lens group disclosed in the embodiment of the present invention, optionally, at least one aperture stop may be disposed, which may be located before the first lens (on the first side), between the lenses, or after the last sixth lens (on the second side), and the aperture stop may be, for example, an aperture stop or a field stop, which may be used to reduce stray light, and is helpful for improving the image display quality.
Example 1
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 includes 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 disposed in order from a first side (i.e., a side where the diaphragm 01 in fig. 3 is located) to a second side (i.e., a side where the scan curved surface 02 in fig. 3 is located) on a common optical axis.
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, and 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-adhesive 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 positive in order.
The first side surface and the second side surface of the first lens 11 are both convex.
The first side surface of the second lens 12 is concave at a paraxial region, and the second side surface is convex.
The first side surface of the third lens 13 is concave at a paraxial region, and the second side surface is convex.
The fourth lens 14 has a convex first side surface and a concave second side surface.
The fifth lens element 15 has a convex first side surface and a convex second side surface at a paraxial region.
The sixth lens 16 has a convex first side surface and a concave second side surface at a paraxial region.
In the present embodiment, the focal lengths of the first lens 11 to the sixth lens 16 in the optical imaging lens group satisfy the following relationship:
1<f 1 /f<3、2<f 2 /f<3、0.2<|f 3 /f|<1、2<f 4 /f、0.5<f 5 /f<1.5 and 1<f 6 /f<3, a step of; wherein f 1 F is the focal length of the first lens 11 2 F is the focal length of the second lens 12 3 F is the focal length of the third lens 13 4 F is the focal length of the fourth lens 14 5 F is the focal length of the fifth lens 15 6 F is the focal length of the sixth lens 16, and f is the equivalent focal length of the optical imaging lens group.
The refractive index and the abbe number of the first lens 11 to the sixth lens 16 in the optical imaging lens group satisfy the following conditions, respectively:
n1 is 1.57, n2 is 1.54, n3 is 1.63, n4 is 1.63, n5 is 1.53, and n6 is 1.54. Wherein n1 to n6 represent refractive indices of the first lens 11 to the sixth lens 16, respectively; the abbe number of the first lens is 37.7, the abbe number of the second lens is 56.8, the abbe number of the third lens is 23.3, the abbe number of the fourth lens is 23.4, the abbe number of the fifth lens is 55.0, and the abbe number of the sixth lens is 56.8.
In the optical imaging lens group provided by the embodiment of the invention, the material of the lens is plastic; the equivalent focal length of the whole optical imaging lens group is 3.00mm, the aperture value is 1.50, the half field angle is 13 degrees, and the preferred parameters of the curvature radius, thickness parameter, refractive index and dispersion coefficient of each lens for imaging the scanning curved surface 02 are shown in table 1:
table 1 structural parameters of optical imaging lens group in example one
Surface of the body Lens serial number Surface shape Radius of curvature Thickness/spacing Material Refractive index of material Coefficient of dispersion
0 Imaging plane Plane surface Infinite number of cases Infinite number of cases
1 Diaphragm 01 Infinite number of cases 1
2 First lens 11 Aspherical surface 19.605 1.015 Plastic material 1.57 37.7
3 Aspherical surface -5.117 1.369
4 Second lens 12 Aspherical surface -4.492 1.914 Plastic material 1.54 56.8
5 Aspherical surface -2.007 0.824
6 Third lens 13 Aspherical surface -0.639 0.757 Plastic material 1.63 23.3
7 Aspherical surface -15.745 0.100
8 Fourth lens 14 Aspherical surface 10.953 0.500 Plastic material 1.63 23.4
9 Aspherical surface 11.814 0.100
10 Fifth lens 15 Aspherical surface 1.724 1.954 Plastic material 1.53 55.0
11 Aspherical surface -3.897 0.100
12 Sixth lens 16 Aspherical surface 1.008 1.735 Plastic material 1.54 56.8
13 Aspherical surface 0.594 0.634
14 Curved surface of scan 02 Spherical surface 1.7
It should be noted that, table 1 is detailed structural data of the optical imaging lens assembly of the first embodiment, wherein units of curvature radius, thickness and focal length are all millimeter, and surfaces 0 to 14 sequentially represent surfaces from the first side to the second side; an optical surface with an "infinite" radius of curvature in the imaging plane is referred to as a plane.
Further, aspherical cone coefficients of the corresponding surfaces of the first lens 11 to the sixth lens 16 are shown in table 2 below:
table 2 aspherical conic coefficient data for different lens surfaces in example one
Figure BDA0003174858190000111
Figure BDA0003174858190000121
Table 2 shows aspherical coefficient data in the first embodiment, where k is a conic coefficient in the aspherical curve equation, and A4 to a12 represent the 4 th to 12 th order aspherical coefficients of each surface.
Further, through testing, 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, a field curvature distortion curve graph is shown in fig. 5, an axial chromatic aberration curve is shown in fig. 6, and a vertical chromatic aberration curve is shown in fig. 7; wherein the optical transfer function graph (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field Qu Jibian graph represents the F-Tan (theta) distortion magnitude value (percent) at different angles of view, and the axial chromatic aberration graph and the vertical chromatic aberration graph represent chromatic aberration magnitudes at different directions.
As can be seen from fig. 4 to fig. 7, the optical imaging lens group of the first embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system within the full field of view, so that the optical imaging lens group can clearly image the curved surface image scanned by the optical fiber scanner, and has good imaging effect.
Of course, in practical application, the optical imaging lens group may further include a photosensitive element, a housing, etc., the photosensitive element may be disposed on the second side of the optical imaging lens group, and the optical imaging lens group may be installed 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, to realize clear imaging.
Example two
Fig. 8 is a schematic structural diagram of an optical imaging lens assembly according to an embodiment of the present invention. The optical imaging lens group includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, and a sixth lens 36, which are disposed in order from a first side (i.e., a side where the diaphragm 03 in fig. 8 is located) to a second side (i.e., a side where the scan curved surface 04 in fig. 8 is located) on a common optical axis.
In the present embodiment, each two adjacent lenses of the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the fifth lens 35 and the sixth lens 36 have a space therebetween, and the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the fifth lens 35 and the sixth lens 36 are six single non-adhesive lenses.
The focal lengths of the first lens 31 to the sixth lens 36 from the first side to the second side are positive, negative, positive, and positive in order.
The first side surface and the second side surface of the first lens 31 are both convex.
The first side surface of the second lens 32 is concave at a paraxial region, and the second side surface is convex.
The first side surface and the second side surface of the third lens 33 are concave at a paraxial region.
The fourth lens 34 has a convex first side surface and a concave second side surface.
The fifth lens element 35 has a convex first side surface and a convex second side surface at a paraxial region.
The sixth lens element 36 has a convex first side surface and a concave second side surface at a paraxial region.
In the present embodiment, the focal lengths of the first lens element 31 to the sixth lens element 36 in the optical imaging lens assembly satisfy the following relationship:
1<f 1 /f<3、2<f 2 /f<3、0.2<|f 3 /f|<1、2<f 4 /f、0.5<f 5 /f<1.5 and 1<f 6 /f<3, a step of; wherein f 1 F is the focal length of the first lens 31 2 F is the focal length of the second lens 32 3 F is the focal length of the third lens 33 4 F is the focal length of the fourth lens 34 5 F is the focal length of the fifth lens 35 6 F is the focal length of the sixth lens 36 and f is the equivalent focal length of the optical imaging lens assembly.
The refractive index and the abbe number of the first lens 31 to the sixth lens 36 in the optical imaging lens group satisfy the following conditions, respectively:
n1 is 1.57, n2 is 1.54, n3 is 1.63, n4 is 1.67, n5 is 1.53, and n6 is 1.54. Wherein n1 to n6 represent refractive indices of the first lens 31 to the sixth lens 36, respectively; the abbe number of the first lens is 37.7, the abbe number of the second lens is 55.9, the abbe number of the third lens is 23.3, the abbe number of the fourth lens is 19.3, the abbe number of the fifth lens is 55.0, and the abbe number of the sixth lens is 56.0.
In the optical imaging lens group provided by the second embodiment of the invention, the material of the lens is plastic; the equivalent focal length of the whole optical imaging lens group is 2.99mm, the aperture value is 1.50, the half field angle is 13 degrees, and the preferred parameters of the curvature radius, thickness parameter, refractive index and dispersion coefficient of each lens for imaging the scanning curved surface 04 are shown in table 3:
table 3 structural parameters of optical imaging lens group in example two
Surface of the body Lens serial number Surface shape Radius of curvature Thickness/spacing Material Refractive index of material Coefficient of dispersion
0 Imaging plane Plane surface Infinite number of cases Infinite number of cases
1 Diaphragm 03 Infinite number of cases 1
2 First lens 31 Aspherical surface 45.547 1.508 Plastic material 1.57 37.7
3 Aspherical surface -3.468 0.960
4 Second lens 32 Aspherical surface -4.118 2.000 Plastic material 1.54 55.9
5 Aspherical surface -1.727 0.710
6 Third lens 33 Aspherical surface -0.571 0.506 Plastic material 1.63 23.3
7 Aspherical surface 8.011 0.100
8 Fourth lens 34 Aspherical surface 8.596 0.602 Plastic material 1.67 19.3
9 Aspherical surface 76.393 0.100
10 Fifth lens 35 Aspherical surface 1.631 2.035 Plastic material 1.53 55.0
11 Aspherical surface -3.111 0.100
12 Sixth lens 36 Aspherical surface 1.016 1.638 Plastic material 1.54 56.0
13 Aspherical surface 0.647 0.700
14 Scan curved surface 04 Spherical surface 1.7
It should be noted that, table 3 is detailed structural data of the optical imaging lens assembly of the second embodiment, wherein units of curvature radius, thickness and focal length are all millimeter, and surfaces 0 to 14 sequentially represent surfaces from the first side to the second side; an optical surface with an "infinite" radius of curvature in the imaging plane is referred to as a plane.
Further, aspherical cone coefficients of the surfaces corresponding to the first lens 31 to the sixth lens 36 are shown in table 4 below:
table 4 aspherical conic coefficient data for different lens surfaces in example two
Surface of the body K A4 A6 A8 A10 A12
2 9.0328E+001 6.0133E-003 2.3145E-003 -8.4284E-003 4.1766E-003 -7.8647E-004
3 -1.1131E+001 -1.7791E-003 -5.5366E-003 -4.9313E-003 2.4993E-003 -3.6749E-004
4 -4.8178E+001 -2.6968E-002 -1.3518E-002 -4.4377E-003 -4.4210E-003 4.1612E-004
5 -8.5022E+000 -3.2863E-002 -6.5551E-003 2.2416E-004 5.0357E-004 -7.7455E-005
6 -2.2165E+000 -6.7324E-003 2.5027E-003 6.4400E-004 1.6351E-004 -7.2173E-005
7 -3.2621E+000 -6.2968E-004 6.9500E-004 -3.0836E-004 -1.1910E-004 1.4743E-005
8 -4.8685E+000 7.8382E-003 1.1613E-003 7.3143E-005 -1.5386E-005 -9.6906E-006
9 -1.8050E+001 -3.9877E-003 1.4843E-003 5.2694E-004 1.1460E-004 -3.2007E-005
10 -2.9532E+000 -2.3742E-003 1.1034E-003 1.1903E-004 -2.9720E-005 4.7544E-006
11 -2.0451E+000 3.1335E-003 6.5191E-004 1.8951E-004 2.7059E-005 -4.3861E-006
12 -6.1178E-001 -3.7519E-002 -1.3791E-002 8.4869E-003 -3.6070E-003 6.1459E-004
13 -1.5739E+000 -2.3784E-002 1.4344E-001 3.0569E-001 -1.6249E-001 -1.5593E-001
Table 4 shows aspherical coefficient data in the second embodiment, where k is a conic coefficient in the aspherical curve equation, and A4 to a12 represent the 4 th to 12 th order aspherical coefficients of each surface.
Further, through testing, 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. 9, a field curvature distortion curve graph is shown in fig. 10, an axial chromatic aberration curve is shown in fig. 11, and a vertical chromatic aberration curve is shown in fig. 12; wherein the optical transfer function graph (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field Qu Jibian graph represents the F-Tan (theta) distortion magnitude value (percent) at different angles of view, and the axial chromatic aberration graph and the vertical chromatic aberration graph represent chromatic aberration magnitudes at different directions.
As can be seen from fig. 9 to fig. 12, the optical imaging lens group of the second embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system within the full field of view, so that the optical imaging lens group can clearly image the curved surface image scanned by the optical fiber scanner, and has good imaging effect.
Of course, in practical application, the optical imaging lens group may further include a photosensitive element, a housing, etc., the photosensitive element may be disposed on the second side of the optical imaging lens group, and the optical imaging lens group may be installed 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, to realize clear imaging.
Scanning display device
The optical imaging lens group can be matched with an optical fiber scanner (or a corresponding optical fiber scanning module) to form a scanning display device in the embodiment of the application (as shown in fig. 1a and 1b, the optical imaging lens group is arranged on an emergent light path of the optical fiber scanner), wherein a first side of the optical imaging lens group faces the emergent light direction of the optical fiber scanner, and a preferable mode is that the optical imaging lens group and a central optical axis of the optical fiber scanner are coaxial. Of course, reference may be made to the foregoing descriptions corresponding to fig. 1a and 1b for the structure and general principle of the optical fiber scanner, and redundant descriptions are omitted here.
Near-to-eye display device
In the application, the scanning display device can be further applied to a near-eye display device, and can be matched with the near-eye display module to form the near-eye display device in the embodiment of the application to be used as a head-mounted AR device (such as AR glasses). The scanning display device is arranged in the near-eye display module.
Wherein, the near-eye display module can include: light sources, process control circuitry, wearable frame structures, waveguides, 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, and the scanning curved surface of the optical fiber scanner (refer to the scanning curved surface 02 in fig. 3 and the scanning curved surface 230 in fig. 2) is converted into an imaging plane (refer to the imaging plane 240 in fig. 2) after passing through the optical display mirror group, and the imaging plane is coupled into the waveguide as an entrance pupil surface of the waveguide, is coupled out through waveguide expansion imaging, and enters the human eye.
As another possible implementation, the scanning display apparatus may further be configured to be used as a head-mounted VR device (e.g., VR helmet/glasses) in conjunction with a near-eye display module to form a near-eye display device as in the examples of this application. The scanning display device is arranged in the near-eye display module.
In the embodiment of the application, the focal lengths of the six optical axis lenses of the optical imaging lens group are reasonably and optimally set, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lenses is slowed down, the aim of correcting various aberrations is fulfilled, and clear imaging of an image side curved surface is realized on the basis of improving the angle of view; the imaging quality and the angle of view are further improved by limiting and optimizing the refractive index, the dispersion coefficient and the surface type structure of the six lenses with the same optical axis; the six lens with the same optical axis are limited and optimally designed into an aspheric surface-shaped structure and are made of plastic materials, so that the forming processing difficulty of the whole optical imaging lens group is reduced on the basis of further improving the imaging quality, and the mass production is facilitated at low cost.
The foregoing description is only of the preferred embodiments of the present application, and the embodiments are merely for illustrating the technical solutions of the present application, not for limiting the present application, and all the technical solutions that can be obtained by logic analysis, reasoning or effective experiments by those skilled in the art according to the concepts of the present application should be within the scope of the present application.
All embodiments in the application are described in a progressive manner, and identical and similar parts of all embodiments are mutually referred, so that each embodiment mainly describes differences from other embodiments.
The terms "first," "second," "the first," or "the second," as used in various embodiments of the present disclosure, may modify various components without regard to order and/or importance, but these terms do not limit the corresponding components. The above description is only configured for the purpose of distinguishing an element from other elements. For example, the first lens and the second lens represent different lenses, although both are lenses.

Claims (9)

1. The optical imaging lens group is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from a first side to a second side in a common optical axis manner, wherein focal lengths corresponding to the first lens to the sixth lens are positive, negative, positive and positive respectively;
each of the lenses satisfies the following relationship: 1<f 1 /f<3、2<f 2 /f<3、0.2<|f 3 /f|<1、2<f 4 /f、0.5<f 5 /f<1.5 and 1<f 6 /f<3, a step of; wherein f 1 F is the focal length of the first lens 2 F is the focal length of the second lens 3 F is the focal length of the third lens 4 F is the focal length of the fourth lens 5 F is the focal length of the fifth lens 6 And f is the focal length of the optical imaging lens group.
2. The optical imaging lens set of claim 1 wherein each of said lenses further satisfies the following relationship:
1.5<n1<1.7，1.5<n2<1.7，1.6<n3<1.7，1.5<n4<1.7，1.45<n5<1.6，1.5<n6<1.7；
wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens.
3. The optical imaging lens assembly of claim 2, wherein n1 is 1.57, n2 is 1.54, n3 is 1.63, n4 is 1.63 or 1.67, n5 is 1.53, and n6 is 1.54;
the dispersion coefficients of the various lenses satisfy: the abbe number of the first lens is 37.7, the abbe number of the second lens is 56.8 or 55.9, the abbe number of the third lens is 23.3, the abbe number of the fourth lens is 23.4 or 19.3, the abbe number of the fifth lens is 55.0, and the abbe number of the sixth lens is 56.8 or 56.0.
4. The optical imaging lens assembly of any of claims 1-3, wherein a first side surface of the sixth lens is convex and a second side surface of the sixth lens is concave at a paraxial region.
5. The optical imaging lens assembly of claim 4, wherein 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 first side surface of the third lens is a concave surface at a paraxial region; the first side surface of the fifth lens is convex, and the second side surface of the fifth lens is convex at a paraxial region.
6. The optical imaging lens assembly of claim 1, wherein the first side surface and the second side surface of the first lens to the sixth lens are each of an aspherical surface profile structure;
the first lens to the sixth lens are all made of plastic;
the second side of the optical imaging lens group corresponds to a curved image, and the first side of the optical imaging lens group corresponds to a planar image.
7. A scanning display device, comprising an optical fiber scanner and the optical imaging lens set of any one of the preceding claims 1 to 6, wherein the optical fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging lens set is used for performing enlarged imaging and projection on 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 the part of the optical fiber exceeding the actuator forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to perform two-dimensional scanning.
8. A near-eye display device for use as a head-mounted augmented reality device, comprising at least a near-eye display module and a scanning display device according to claim 7, the scanning display device being arranged in the near-eye display module.
9. A near-eye display device, characterized in that the near-eye display device is used as a head-mounted virtual reality device, comprising at least a near-eye display module and a scanning display device according to claim 7, the scanning display device being arranged in the near-eye display module.
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