CN217606165U - 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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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 slow down the aberration generated by the lenses by reasonably and optimally setting the focal lengths and the surface type structures of the related lenses in the eight same-optical-axis lenses of the optical imaging lens group, so as to achieve the aim of correcting various aberrations, thereby realizing clear imaging of the curved surface of the image side on the basis of improving the field angle; the large field angle of the optical imaging lens group is further ensured and the correction of various optical aberrations is enhanced by the combined use of the aspheric lens and the spherical lens, the reasonable use of the single lens and the cemented lens and the associated proportional limitation of the radial maximum effective semi-aperture of the partial lenses; meanwhile, the size and the weight of the optical imaging lens group are further reduced, so that the overall structural configuration of the optical imaging lens group can be more compact, and the production requirement of miniaturization of lens products is met.
Description
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 a new display technology, and can be used for various application scenes such as projection display, near-eye display and the like.
However, the existing scanning display imaging system has the disadvantages of high processing difficulty, high volume production cost, poor imaging quality, small viewing angle, and being incapable of miniaturization, so that the scanning display imaging technology is limited in the market popularization and application process, and especially when the scanning display imaging is applied to a near-eye display scene, the scanning display imaging technology is limited by the influence of the imaging effect and the viewing angle, so that the scanning display imaging technology cannot meet the performance requirement of high resolution in near-eye display at all times, and the development of the near-eye display to the consumer-grade market is hindered.
Disclosure of Invention
An object of the present application is to provide an optical imaging lens group, a scanning display device and a near-eye display apparatus, so as to meet the requirements of large field angle, high imaging quality and miniaturization of mass production in a near-eye display scene.
The embodiment of the application provides an optical imaging lens group, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are coaxially arranged from a first side to a second side in sequence, wherein focal lengths corresponding to the first lens, the second lens, the third lens and the sixth lens are respectively negative, positive and positive;
the first lens and the optical imaging lens group have the following relations: f is more than or equal to 0.7 1 /f General (1) | ≦ 1.2, wherein, the f 1 Is the focal length of the first lens, said f General (1) The total focal length of the optical imaging lens group is obtained.
Optionally, in a preferred embodiment of the present invention, the first lens, the second lens, the third lens, the fourth lens, the sixth lens and the eighth lens are all spherical lenses;
the fifth lens and the seventh lens are both aspheric lenses.
Further optionally, in a preferred embodiment of the present invention, the fourth lens and the sixth lens are both spherical cemented lenses.
Optionally, in a preferred embodiment of the present invention, each of the fourth lens and the sixth lens includes two sub-lenses, wherein the two sub-lenses of the fourth lens are arranged along a common optical axis from the first side to the second side and have positive and negative corresponding focal lengths, respectively; the two sub-lenses of the sixth lens are arranged from the first side to the second side in a coaxial mode, and the positive and negative of the corresponding focal length are respectively negative and positive.
Further optionally, in a preferred embodiment of the present invention, a second side surface of the sub-lens of the fourth lens, which is close to the fifth lens, is a concave surface; the first side surface of the fifth lens is a concave surface.
Further optionally, in a preferred embodiment of the present invention, the focal lengths of the fourth lens element, the fifth lens element, the seventh lens element and the eighth lens element are negative, positive and positive, respectively;
the sub-lens of the fourth lens close to the fifth lens has the following relation with the optical imaging lens group: f is more than or equal to 0.8 4-2 /f General (1) | < 1.5, wherein f 4-2 Is the focal length of the sub-lens of the fourth lens close to the fifth lens, f General assembly The total focal length of the optical imaging lens group is obtained.
Further optionally, in a preferred embodiment of the present invention, the maximum effective half aperture of the third lens in the radial direction is Y1, the maximum effective half apertures of the fourth lens and the fifth lens in the radial direction are the same and Y2, and the maximum effective half aperture of the seventh lens in the radial direction is Y3;
wherein said Y1 and said Y2 have the following relationship: Y1/Y2 is more than or equal to 1 and less than or equal to 1.4;
said Y2 and said Y3 have the following relationship: Y3/Y2 is more than or equal to 1.4 and less than or equal to 1.7.
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 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 application further provides near-eye display equipment, the near-eye display equipment is used as head-mounted augmented reality equipment, at least comprises a near-eye display module and a scanning display device according to the scanning display device, and the scanning display device is arranged in the near-eye display module.
The embodiment of the application further provides near-eye display equipment, the near-eye display equipment is used as head-mounted virtual reality equipment, at least comprises a near-eye display module and a scanning display device according to the above, and the scanning display device is arranged in the near-eye display module.
By adopting the technical scheme in the embodiment of the application, the following technical effects can be realized:
in the embodiment of the application, the focal lengths of eight coaxial lenses 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 lenses is reduced, and the purpose of correcting various aberrations is achieved, thereby realizing clear imaging of the image side curved surface on the basis of improving the field angle.
Furthermore, the optical imaging lens group has a more compact overall structure through the combination and configuration of a reasonable number of lenses, and the production requirements of miniaturization and mass production of lens products are met; by combining the aspheric lens and the spherical lens, reasonably using the single lens and the cemented lens and carrying out related proportion limitation on the radial maximum effective semi-aperture of partial lenses, the correction on various optical aberrations is further strengthened, clear imaging is realized, and meanwhile, the volume and the weight of the optical imaging lens group are further reduced.
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 the practice of the invention. The objectives and other advantages of the application may be realized and attained by the structure and/or processes 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 following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIGS. 1a and 1b are schematic structural views of an illustrative scanning display system;
FIG. 2a is a schematic diagram of a scan output of a fiber scanner provided by an embodiment of the present application;
FIG. 2b is a schematic view of a lens element of the optical imaging lens assembly provided in the embodiment of the present application along a radial direction with a maximum effective half aperture;
FIG. 3 is a schematic structural diagram of an optical imaging lens assembly according to an embodiment of the present application;
FIG. 4 is a MTF graph of an optical imaging lens assembly according to an embodiment of the present disclosure;
FIG. 5 is a graph of field curvature distortion of an optical imaging lens assembly in accordance with an embodiment of the present invention;
FIG. 6 is a vertical axis chromatism chart of an optical imaging lens assembly according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of an optical imaging lens assembly according to a second embodiment of the present application;
FIG. 8 is a MTF graph of an optical imaging lens assembly according to a second embodiment of the present application;
FIG. 9 is a graph showing curvature of field distortion of the optical imaging lens assembly according to the second embodiment of the present application;
FIG. 10 is a vertical axis chromatism chart of the optical imaging lens assembly according to the second embodiment of the present application;
fig. 11 is a schematic structural diagram of an optical imaging lens assembly provided in the third embodiment of the present application;
FIG. 12 is a MTF graph of an optical imaging lens group according to a third embodiment of the present application;
FIG. 13 is a graph of curvature of field distortion of an optical imaging lens assembly in a third embodiment of the present application;
FIG. 14 is a vertical axis chromatism chart of an optical imaging lens assembly according to a third embodiment of the present application;
FIG. 15 is a schematic structural diagram of an optical imaging lens assembly according to a fourth embodiment of the present application;
FIG. 16 is a MTF graph of an optical imaging lens group in example four of the present application;
FIG. 17 is a graph showing the field curvature distortion of the optical imaging lens group in the fourth embodiment of the present application;
FIG. 18 is a vertical axis chromatism chart of the optical imaging lens assembly according to the fourth embodiment of the present application;
fig. 19 is a schematic structural diagram of an optical imaging lens assembly provided in the fifth embodiment of the present application;
FIG. 20 is a MTF graph of a fifth optical imaging lens group according to an embodiment of the present application;
FIG. 21 is a graph showing the field curvature distortion of the optical imaging lens group in the fifth embodiment of the present application;
fig. 22 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in the fifth embodiment of the present application.
Icon: 100-a processor; 110-laser group; 120-fiber scanning module; 130-a transmission fiber; 140-light source modulation circuit; 150-scan drive circuit; 160-beam combining unit; 121-a scanning actuator; 121 a-slow axis; 121 b-fast axis; 122-a fiber optic cantilever; 123-a lens group; 124-scanner package; 125-a 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; 141. 142-a fourth sub-lens; 15-a fifth lens; 16-a sixth lens; 161. 162-sixth sub-lens; 17-a seventh lens; 18-an eighth lens; 01-a diaphragm; 02-scanning a curved surface; 31-a first lens; 32-a second lens; 33-a third lens; 34-a fourth lens; 341. 342-a fourth sub-lens; 35-a fifth lens; 36-a sixth lens; 361. 362-sixth sub-lens; 37-seventh lens; 38-eighth lens; 03-diaphragm; 04-scanning a curved surface; 51-a first lens; 52-a second lens; 53-a third lens; 54-a fourth lens; 541. 542-a fourth sub-lens; 55-a fifth lens; 56-sixth lens; 561. 562-a sixth sub-lens; 57-seventh lens; 58-eighth lens; 05-diaphragm; 06-scanning a curved surface; 71-a first lens; 72-a second lens; 73-a third lens; 74-a fourth lens; 741. 742-a fourth sub-lens; 75-a fifth lens; 76-a sixth lens; 761. 762-sixth sub-lens; 77-seventh lens; 78-eighth lens; 07-a diaphragm; 08-scanning a curved surface; 91-a first lens; 92-a second lens; 93-a third lens; 94-a fourth lens; 941. 942-fourth sub-lens; 95-a fifth lens; 96-sixth lens; 961. 962-sixth sub-lens; 97-seventh lens; 98-eighth lens; 09-diaphragm; 10-scanning a curved surface.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant 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, it can be implemented by Micro-Electro-Mechanical systems (MEMS) or 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 application clearly understandable to those skilled in the art, the following provides a brief description of the principles of fiber scanning imaging and a corresponding system.
Fig. 1a is a schematic diagram of an illustrative scanning display system according to the present application, which mainly includes:
the optical fiber scanning device comprises a processor 100, a laser group 110, a fiber scanning module 120, a transmission fiber 130, a light source modulation circuit 140, a scanning driving circuit 150 and a beam combining unit 160. Wherein,
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. 1a and 1B, three-color lasers of Red (Red, R), green (G) and Blue (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 in the fiber scanning module 120 to scan and output the light beam transmitted in the transmission fiber 130.
The light beam scanned and output 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 pixel point position is scanned. Under the driving of the optical fiber scanner, the output end of the transmission optical fiber 130 sweeps 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 from the transmission fiber 130 will form a light spot with corresponding image information (e.g., color, gray scale or brightness) at each pixel position. 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 on 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 element 125, the transmission fiber 130 extends at the front end of the scanning actuator 121 to form a fiber suspension arm 122 (also referred to as a scanning fiber), when the scanning actuator 121 is driven by a scanning driving signal, the slow axis 121a (also referred to 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 this application, the vertical direction is also referred to as a first direction), the fast axis 121b (also referred to as a second actuating portion) of the scanning actuator 121 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 this application, the horizontal direction is also referred to as a second direction), the front end of the fiber suspension arm 122 performs two-dimensional scanning according to a predetermined track and emits a light beam, and the emitted light beam can scan and image through the lens group 123. 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. 2a, in this embodiment of the application, 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 mirror group 123, the scanning curved surface is converted into an imaging plane 240 (when imaging is performed on a planar carrier, the imaging is a plane, it should be noted that, in other embodiments of the present invention, the image formed after passing through the mirror group 123 may correspond to the surface of the imaged carrier, that is, may change along with the shape change of the surface of the carrier, as long as the imaging is clear). 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 application, it should be noted that the optical imaging lens assembly (such as the lens assembly 123 shown in fig. 2 a) in the present application is used as an eyepiece, and under the action of the optical imaging lens assembly, the scanning curved surface 230 can be converted into an 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.
It should be further noted that, in the field of projection, the image corresponding to the first side is a planar image, the corresponding planar image carrier may be a projection screen, a curtain, or a wall surface, etc., and the image corresponding to the second side is a curved image, that is, an arc-shaped scanning surface scanned by the optical fiber scanner or emitted by another image source; in a use scene in the field of photography, the light path is opposite to that in the field of projection, the object side surface corresponding to the first side is generally the object side surface for acquiring image information, and the image side surface corresponding to the second side is generally the image side surface obtained by acquiring imaging.
Optical imaging lens group
The optical imaging lens group in the embodiment of the application comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from a first side to a second side in a coaxial manner, wherein focal lengths corresponding to the first lens, the second lens, the third lens and the sixth lens are respectively negative, positive and positive. It should be noted that by arranging a reasonable number of lenses and limiting the positive and negative focal lengths of the first lens, the third lens and the sixth lens, the focal power of the system can be reasonably dispersed, the aberration generated by the lenses can be reduced, and the purpose of correcting various aberrations can be achieved, so that clear imaging of the curved surface of the image space can be realized on the basis of improving the field angle. In addition, it is emphasized that by defining the focal lengths of the third lens and the sixth lens to be positive, the convergence ability of the curved image can be enhanced to balance the aberrations.
Further, in the embodiment of the present application, it is preferable that the focal lengths of the fourth lens, the fifth lens, the seventh lens, and the eighth lens are negative, positive, and positive, respectively. It should be emphasized that, in other embodiments of the present application, the focal lengths of the fourth lens, the fifth lens, the seventh lens and the eighth lens are not limited to positive or negative, and may be positive or negative.
Further preferably, in an embodiment provided by the present invention, the first lens, the second lens, the third lens, the fourth lens, the sixth lens and the eighth lens are all spherical lenses; the fifth lens and the seventh lens are both aspheric lenses. And, the fourth lens and the sixth lens are both spherical cemented lenses. The eight lenses are reasonably configured and used by the aspheric lens and the spherical lens, and the single lens and the cemented lens are reasonably used, so that the correction of various optical aberrations is further enhanced, and clear imaging is performed on the basis of expanding the angle of field. It is emphasized that by limiting the lens surface structures at reasonable positions and numbers (the fifth lens element and the seventh lens element) to aspheric surface structures, more control variables can be obtained to reduce aberrations and reduce the number of lens elements, thereby facilitating miniaturization of the optical imaging lens assembly on the basis of improving image display quality. In addition, the aspheric lens defined above means that the first side surface and the second side surface are both aspheric surface shaped structures, and it is understood that the whole or a part of the optical effective area of the lens surface is aspheric.
Further, it is preferable that, in the embodiment of the present invention, the fourth lens and the sixth lens each have two sub-lenses as the spherical cemented lens. And preferably, the two sub-lenses of the fourth lens are arranged coaxially from the first side to the second side and have positive and negative corresponding focal lengths respectively; the two sub-lenses of the sixth lens are arranged from the first side to the second side in a common optical axis mode, and the positive and negative of the corresponding focal length are negative and positive respectively. It should be noted that, by limiting the positive and negative focal lengths of the corresponding sub-lenses of the fourth lens element and the sixth lens element, chromatic aberration and spherical aberration can be well eliminated, which is important for aberration correction of the entire imaging lens group. Of course, in some embodiments of the present invention, the focal lengths of the two sub-lenses of the fourth lens may be both negative and positive, and the two sub-lenses of the sixth lens may also be both positive. It should be emphasized that, in other embodiments of the present invention, the number of sub-lenses corresponding to the fourth lens and the sixth lens provided by the embodiments of the present invention is not limited, and the number of sub-lenses may also be other numbers, such as 3 or 4, and the arrangement is flexible according to the actual design requirement.
Further, the embodiment of the present invention provides an optical imaging lens assembly, wherein the second side surface of the sub-lens of the fifth lens element, which is close to the fourth lens element, is a concave surface, and the first side surface of the fifth lens element is also a concave surface. It should be noted that, by performing concave surface limitation on two opposite surfaces of the fourth lens element and the fifth lens element (that is, the second side surface of the sub-lens element of the fourth lens element close to the fifth lens element and the first side surface of the fifth lens element), a large field curvature can be generated to match the curvature of the image plane, so as to achieve a good aberration correction effect.
In addition, the first side surface is a convex surface, which means that the first side surface is convex 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.
Further, in some embodiments, the lens surface shape is not concave or convex over the entire side surface, and may be a compound curve, or a curve near the optical axis portion and a curve at the edge portion; especially alternatively, when the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located at the paraxial axis of the lens surface; similarly, when the lens surface is concave and the position of the concave is not defined, it means that the concave can be located at the position of the lens surface near the optical axis.
Furthermore, in the optical imaging lens assembly provided by the embodiment of the present invention, the following relationship exists between the first lens element and the optical imaging lens assembly: f is more than or equal to 0.7 1 /f General assembly | < 1.2, wherein f 1 Is the focal length of the first lens, f General assembly The total focal length of the optical imaging lens group; in addition, the following relationship exists between the sub-lens of the fourth lens element close to the fifth lens element and the optical imaging lens group: f is more than or equal to 0.8 4-2 /f General assembly | < 1.5, wherein f 4-2 Focal length of the sub-lens of the fourth lens close to the fifth lens, f General assembly The total focal length of the optical imaging lens group is shown. It should be noted that the total focal length of the first lens and the optical imaging lens group is adjustedAnd the focal length proportional relation is limited, and the focal length proportional relation is limited on the total focal length of the sub-lens of the fourth lens close to the fifth lens and the optical imaging lens group, so that the focal power of the system is reasonably dispersed and configured, further the correction on various aberrations is enhanced, and the field angle and the imaging quality are improved. In addition, if the position of the area where the focal length of the lens is located is not defined in the embodiment, it means that the focal length of the lens can be the focal length of the lens at the paraxial region. Before the applicant of the present invention, it is emphasized that the existing optical imaging lens group for projection display cannot achieve the balance between the imaging quality and the large field angle, that is, the imaging quality is generally reduced when the field angle is increased, and the imaging quality cannot be ensured and the large field angle cannot be achieved. The invention and creation scheme of the application realizes the high-quality output of imaging while improving the angle of view and achieving miniaturization by limiting and reasonably configuring corresponding characteristics (focal length, spherical and aspherical surfaces, single lens and cemented lens, surface type structure and the like) of the corresponding lens in the eight lenses.
Further, in order to realize the performance balance of the imaging quality and the large field angle of the optical imaging lens group of the embodiment of the present invention, the optical imaging lens group is made to be in the best state, and the following characteristics are defined in the preferred embodiment of the present invention: first, referring to fig. 2b and fig. 3, the maximum effective half aperture of the third lens in the radial direction is Y1, the maximum effective half apertures of two opposite surfaces of the fourth lens and the fifth lens in the radial direction are the same and are Y2, and the maximum effective half aperture of the seventh lens in the radial direction is Y3; and wherein Y1 and Y2 have the following relationship: Y1/Y2 is more than or equal to 1 and less than or equal to 1.4; y2 and Y3 have the following relationship: Y3/Y2 is more than or equal to 1.4 and less than or equal to 1.7.
Further, in a possible embodiment, the eight lenses may be connected at intervals, or may be bonded together by adhesion, which will be determined by the requirements of the practical application, and is not limited herein.
Further optionally, in a possible embodiment, the first to eighth lenses are all made of plastic or glass. It should be noted that the first lens to the eighth 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 facilitated; in addition, the plastic lens can be generally formed by injection molding, has low processing difficulty and can be easily processed into various aspheric surface profiles, and meanwhile, the plastic lens can also reduce the weight of the lens integrally and is beneficial to the light product design. When the glass material is used, the refractive index of the glass material is higher and wider, and the glass material has advantages in the aspect of correcting lens aberration; the glass material has a small expansion coefficient, which is beneficial to precision assembly, and in addition, the glass has the characteristics of high temperature resistance, ultraviolet resistance, acid and alkali resistance and the like, so that the service life and the performance stability of the lens group have strong advantages. It should be emphasized that, in other embodiments of the present invention, the material is not limited to the two materials of plastic and glass provided by the embodiments of the present invention, and may be other materials capable of manufacturing a lens.
It should be noted that, the embodiment of the present invention discloses an optical imaging lens assembly, optionally, can set up at least one diaphragm, and it can be located before the first lens (first side), between each lens or after the last eighth lens (second side), and the kind of this diaphragm can be like aperture diaphragm or field diaphragm, etc., and can be used to reduce stray light, and is helpful to improve image display quality.
Example one
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, a sixth lens 16, a seventh lens 17 and an eighth lens 18 which are arranged in sequence from a first side (i.e. the side where the diaphragm 01 is located in fig. 3) to a second side (i.e. the side where the scanning curved surface 02 is located in fig. 3) in a coaxial manner.
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, the sixth lens 16, the seventh lens 17, and the eighth lens 18 have a space therebetween, and the first lens 11, the second lens 12, the third lens 13, the fifth lens 15, the seventh lens 17, and the eighth lens 18 are six single non-cemented lenses. The fourth lens 14 is a cemented lens composed of two sub-lenses, and the corresponding two sub-lenses are a fourth sub-lens 141 and a fourth sub-lens 142 from the first side to the second side; the sixth lens 16 is also a cemented lens composed of two sub-lenses, and the corresponding two sub-lenses are a sixth sub-lens 161 and a sixth sub-lens 162 from the first side to the second side, respectively.
The focal lengths of the first lens 11 to the eighth lens 18 from the first side to the second side are negative, positive, and positive in sequence, wherein the focal lengths of the fourth sub-lens 141 and the fourth sub-lens 142 included in the fourth lens 14 are positive and negative, respectively, and the focal lengths of the sixth sub-lens 161 and the sixth sub-lens 162 included in the sixth lens 16 are negative and positive, respectively.
The first side surface and the second side surface of the first lens 11 are both concave at the paraxial region;
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 and the second side surface of the third lens 13 are convex surfaces;
the first side surface and the second side surface of the fourth sub-lens 141 in the fourth lens 14 are both convex surfaces, and the first side surface and the second side surface of the fourth sub-lens 142 are both concave surfaces;
the first side surface of the fifth lens element 15 is concave at the paraxial region, and the second side surface thereof is convex at the paraxial region;
the first side surface and the second side surface of the sixth sub-lens 161 in the sixth lens 16 are both concave surfaces, and the first side surface and the second side surface of the sixth sub-lens 162 are both convex surfaces;
the first side surface of the seventh lens element 17 is convex at the paraxial region, and the second side surface is concave at the paraxial region;
the first side surface of the eighth lens element 18 is convex and the second side surface is concave at the paraxial region.
In this embodiment, the focal lengths of the first lens element 11 and the fourth lens element 14 in the optical imaging lens group satisfy the following relation:
0.7≤|f 1 /f general (1) |≤1.2，0.8≤|f 4-2 /f General assembly | < 1.5, wherein f 1 Is the focal length of the first lens, f 4-2 F is the focal length of the sub-lens of the fourth lens 14 close to the fifth lens 15, i.e. the focal length of the fourth sub-lens 142 General assembly The total focal length of the optical imaging lens group is shown. It should be noted that specific focal length values of each lens are shown in table 1:
TABLE 1 Focus parameter table for each lens in optical imaging lens group
The refractive index and the abbe number of the first lens 11, the fourth sub-lens 142 and the sixth sub-lens 161 in the optical imaging lens group respectively satisfy the following conditions:
the refractive index and the abbe number of the first lens 11 are 1.92 and 20.9, respectively; the refractive index and the abbe number of the fourth sub-lens 142 are 1.85 and 23.8, respectively, and the refractive index and the abbe number of the sixth sub-lens 161 are 1.92 and 20.9, respectively.
The embodiment of the utility model provides an in the optical imaging lens group that provides; the total focal length of the whole optical imaging lens group is 2.58mm, and the field angle is 28 degrees. The 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 2:
TABLE 2 structural parameters of the optical imaging lens assembly in the first embodiment
It should be noted that tables 1 and 2 are detailed structural data of the optical imaging lens assembly of the first embodiment, wherein the units of the radius of curvature, the thickness and the focal length are all millimeters, and surfaces 0 to 20 in table 2 sequentially represent the surfaces from the first side to the second side; an optical surface in the imaging plane with a radius of curvature of "infinity" is referred to as a flat surface.
Further, the conic coefficients and the aspherical coefficients of the surfaces corresponding to the fifth lens 15 and the seventh lens 17 (both of which are aspherical lenses) are shown in table 3 below:
TABLE 3 conic coefficient and aspherical coefficient data of aspherical lens surface in example one
| Surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 11 | -7.5E-01 | 1.6E-01 | -5.4E-02 | 6.4E-02 | -4.9E-02 | 2.6E-02 | -9.3E-03 | 2.9E-03 |
| 12 | -1.2E+00 | 4.5E-04 | -1.4E-03 | 1.1E-03 | -1.8E-04 | -1.1E-04 | 4.6E-05 | -3.0E-06 |
| 16 | -6.9E-01 | -6.3E-03 | -1.4E-03 | -1.5E-04 | 8.3E-04 | -5.2E-04 | 1.4E-04 | -1.4E-05 |
| 17 | -1.1E+00 | -4.1E-02 | 2.5E-03 | 6.5E-03 | -5.9E-03 | 2.4E-03 | -4.6E-04 | 3.4E-05 |
Table 3 shows data of conic coefficients and aspherical coefficients in the first embodiment, where k is the conic coefficient in the aspherical surface curve equation, and A4 to a16 represent aspherical coefficients of orders 4 to 16 of each surface.
In addition, referring to fig. 2b and fig. 3 in combination, in this embodiment, the maximum effective half aperture Y1 of the third lens in the radial direction, the maximum effective half aperture Y2 of the two opposite surfaces of the fourth lens and the fifth lens in the radial direction, and the maximum effective half aperture Y3 of the seventh lens in the radial direction satisfy the following relationship: Y1/Y2=1.47, Y3/Y2=1.8.
Further, 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, a field curvature distortion curve graph is shown in fig. 5, and a vertical axis chromatic aberration curve graph is shown in fig. 6; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, the field distortion curve represents the F-Tan distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration in the direction perpendicular to the axial direction.
As can be seen from fig. 4 to fig. 6, the optical imaging lens assembly of the first embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system in the full field of view, so that the optical imaging lens assembly can clearly image the scanning curved image of the optical fiber scanner, and has good imaging effect.
Certainly, in practical applications, the optical imaging lens group may further include a display element and a housing, the display element may be disposed at a second side of the optical imaging lens group, and the optical imaging lens group 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 planar carrier, thereby achieving clear imaging.
Example two
Fig. 7 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 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, a sixth lens 36, a seventh lens 37 and an eighth lens 38 which are arranged in sequence from a first side (i.e. the side where the diaphragm 03 is located in fig. 7) to a second side (i.e. the side where the scanning curved surface 04 is located in fig. 7) in a coaxial manner.
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, the sixth lens 36, the seventh lens 37 and the eighth lens 38 have a space therebetween, and the first lens 31, the second lens 32, the third lens 33, the fifth lens 35, the seventh lens 37 and the eighth lens 38 are six single non-cemented lenses. The fourth lens 34 is a cemented lens composed of two sub-lenses, corresponding to the two sub-lenses, a fourth sub-lens 341 and a fourth sub-lens 342 from the first side to the second side, respectively; the sixth lens 36 is also a cemented lens composed of two sub-lenses, and the corresponding sub-lenses are a sixth sub-lens 361 and a sixth sub-lens 362 from the first side to the second side.
The focal lengths of the first lens 31 to the eighth lens 38 from the first side to the second side are negative, positive, and negative, in this order, wherein the focal lengths of the fourth sub-lens 341 and the fourth sub-lens 342 included in the fourth lens 34 are positive and negative, respectively, and the focal lengths of the sixth sub-lens 361 and the sixth sub-lens 362 included in the sixth lens 36 are negative and positive, respectively.
The first side surface and the second side surface of the first lens 31 are both concave at the paraxial region;
the first side surface of the second lens element 32 is concave at the paraxial region and the second side surface is convex.
The first side surface and the second side surface of the third lens 33 are convex;
both the first side surface and the second side surface of the fourth sub-lens 341 in the fourth lens 34 are convex surfaces, and both the first side surface and the second side surface of the fourth sub-lens 342 are concave surfaces;
the first side surface of the fifth lens element 35 is concave at the paraxial region and the second side surface is convex at the paraxial region;
a first side surface of a sixth sub-lens 361 of the sixth lens 36 is a convex surface, a second side surface of the sixth lens is a concave surface, and both the first side surface and the second side surface of the sixth sub-lens 362 are convex surfaces;
the first side surface of the seventh lens element 37 is convex at the paraxial region, and the second side surface is concave at the paraxial region;
the first side surface of the eighth lens element 38 is convex and the second side surface is concave at the paraxial region.
In the present embodiment, the focal lengths of the first lens element 31 and the fourth lens element 34 in the optical imaging lens group satisfy the following relation:
0.7≤|f 1 /f general (1) |≤1.2，0.8≤|f 4-2 /f General assembly | < 1.5, wherein f 1 Is the focal length of the first lens, f 4-2 F is the focal length of the sub-lens of the fourth lens 34 close to the fifth lens 35, i.e. the focal length of the fourth sub-lens 342 General assembly The total focal length of the optical imaging lens group is shown. It should be noted that specific focal length values of each lens are shown in table 4:
TABLE 4 focal length parameter table for each lens in optical imaging lens group
| Lens | Focal length | Lens focal length/total lens focal length |
| First lens 31 | -2.53 | -0.99 |
| |
6.38 | 2.50 |
| |
3.61 | 1.41 |
| Fourth lens 34 | -12.10 | -4.75 |
| |
5.74 | 2.25 |
| Fourth sub-lens 342 | -3.01 | -1.18 |
| Fifth lens 35 | -16.14 | -6.33 |
| |
22.04 | 8.64 |
| Sixth sub-lens 361 | -15.40 | -6.04 |
| |
22.90 | 8.98 |
| |
6.01 | 2.36 |
| Eighth lens 38 | -23.16 | -9.08 |
The refractive index and the abbe number of the first lens 31, the fourth sub-lens 342 and the sixth sub-lens 361 in the optical imaging lens group respectively satisfy the following conditions:
the refractive index and the abbe number of the first lens 31 are 1.95 and 17.9, respectively; the refractive index and the abbe number of the fourth sub-lens 342 are 1.78 and 25.7, respectively, and the refractive index and the abbe number of the sixth sub-lens 361 are 1.92 and 18.89, respectively.
The embodiment of the utility model provides an in the optical imaging lens group; the total focal length of the whole optical imaging lens group is 2.58mm, and the field angle is 28 degrees. The 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 5:
TABLE 5 structural parameters of the optical imaging lens assembly of the second embodiment
It should be noted that tables 4 and 5 are detailed structural data of the optical imaging lens assembly of the second embodiment, wherein the units of the radius of curvature, the thickness and the focal length are all millimeters, and surfaces 0-20 in table 5 sequentially represent the surfaces from the first side to the second side; an optical surface in the imaging plane with a radius of curvature of "infinity" is referred to as a flat surface.
Further, aspheric conic coefficients of the surfaces corresponding to the fifth lens 35 and the seventh lens 37 (both aspheric lenses) are shown in table 6 below:
TABLE 6 conic coefficient and aspherical coefficient data of aspherical lens surface in example two
| Surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 11 | -9.83E-01 | 6.19E-02 | -2.18E-02 | -9.85E-04 | 3.42E-02 | -5.23E-02 | 3.47E-02 | -8.51E-03 |
| 12 | -1.10E+00 | -2.14E-02 | 1.43E-02 | -1.15E-02 | 7.37E-03 | -3.01E-03 | 6.84E-04 | -6.44E-05 |
| 16 | -9.81E-01 | -1.45E-02 | 8.92E-03 | -6.56E-03 | 4.10E-03 | -1.64E-03 | 3.49E-04 | -2.96E-05 |
| 17 | -5.03E+00 | -1.23E-03 | -1.35E-02 | 1.48E-02 | -1.04E-02 | 4.09E-03 | -7.93E-04 | 5.82E-05 |
Table 6 shows data of conic coefficients and aspherical coefficients in example two, where k is the conic coefficient in the aspherical surface curve equation, and A4 to a16 represent aspherical coefficients of order 4 to 16 of each surface.
In addition, referring to fig. 2b and fig. 7 in combination, the maximum effective half aperture Y1 of the third lens in the radial direction, the maximum effective half aperture Y2 of the fourth lens and the fifth lens in the radial direction, and the maximum effective half aperture Y3 of the seventh lens in the radial direction in the present embodiment satisfy the following relationship: Y1/Y2=1.37, Y3/Y2=1.7.
Furthermore, through tests, when the optical imaging lens group is used for projecting image light corresponding to a scanning surface, an optical transfer function curve graph is shown in fig. 8, a field curvature distortion curve graph is shown in fig. 9, and a vertical axis chromatic aberration curve graph is shown in fig. 10; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, the field distortion curve represents the F-Tan distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration in the direction perpendicular to the axial direction.
As can be seen from fig. 8-10, the optical imaging lens assembly of the second embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system in the full field of view, so that the optical imaging lens assembly can clearly image the scanning curved image of the optical fiber scanner, and has good imaging effect.
Certainly, in practical applications, the optical imaging lens group may further include a display element and a housing, the display element may be disposed at a second side of the optical imaging lens group, and the optical imaging lens group 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 planar carrier, thereby achieving clear imaging.
EXAMPLE III
Fig. 11 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 51, a second lens 52, a third lens 53, a fourth lens 54, a fifth lens 55, a sixth lens 56, a seventh lens 57 and an eighth lens 58 which are arranged in sequence from a first side (i.e. the side where the diaphragm 05 is located in fig. 11) to a second side (i.e. the side where the scanning curved surface 06 is located in fig. 11) in a coaxial manner.
In the present embodiment, each two adjacent lenses of the first lens 51, the second lens 52, the third lens 53, the fourth lens 54, the fifth lens 55, the sixth lens 56, the seventh lens 57, and the eighth lens 58 have a space therebetween, and the first lens 51, the second lens 52, the third lens 53, the fifth lens 55, the seventh lens 57, and the eighth lens 58 are six single non-cemented lenses. The fourth lens 54 is a cemented lens composed of two sub-lenses, and the corresponding sub-lenses are the fourth sub-lens 541 and the fourth sub-lens 542 from the first side to the second side; the sixth lens 56 is also a cemented lens composed of two sub-lenses, and a sixth sub-lens 561 and a sixth sub-lens 562 are respectively provided from the first side to the second side corresponding to the two sub-lenses.
The focal lengths of the first lens 51 to the eighth lens 58 from the first side to the second side are negative, positive, negative and positive in sequence, wherein the focal lengths of the fourth sub-lens 541 and the fourth sub-lens 542 included in the fourth lens 54 are negative and negative respectively, and the focal lengths of the sixth sub-lens 561 and the sixth sub-lens 562 included in the sixth lens 56 are positive and positive respectively.
The first side surface and the second side surface of the first lens 51 are both concave at the paraxial region;
the first side surface and the second side surface of the second lens 52 are convex.
The first side surface and the second side surface of the third lens 53 are both convex surfaces;
the first side surface of the fourth sub-lens 541 in the fourth lens 54 is concave at the paraxial region, the second side surface is convex, and both the first side surface and the second side surface of the fourth sub-lens 542 are concave;
the first side surface of the fifth lens element 55 is concave at the paraxial region and the second side surface is convex at the paraxial region;
the first side surface of the sixth sub-lens 561 of the sixth lens 56 is a convex surface, the second side surface is a concave surface, and the first side surface and the second side surface of the sixth sub-lens 562 are both convex surfaces;
the first side surface of the seventh lens element 57 is convex at the paraxial region, and the second side surface is concave at the paraxial region;
the first side surface of the eighth lens element 58 is convex and the second side surface is concave at the paraxial region.
In the present embodiment, the focal lengths of the first lens element 51 and the fourth lens element 54 in the optical imaging lens group satisfy the following relation:
0.7≤|f 1 /f general assembly |≤1.2，0.8≤|f 4-2 /f General assembly | < 1.5, wherein f 1 Is the focal length of the first lens, f 4-2 F is the focal length of the sub-lens of the fourth lens 54 close to the fifth lens 55, i.e. the focal length of the fourth sub-lens 542 General assembly The total focal length of the optical imaging lens group is shown. It should be noted that specific focal length values of each lens are shown in table 7:
TABLE 7 Focus parameter table for each lens in optical imaging lens group
| Lens piece | Focal length | Lens focal length/total lens focal length |
| First lens 51 | -1.94 | -0.70 |
| |
3.18 | 1.15 |
| |
2.90 | 1.05 |
| Fourth lens 54 | -2.41 | -0.87 |
| Fourth sub-lens 541 | -5.55 | -2.01 |
| Fourth sub-lens 542 | -2.76 | -1.00 |
| |
6.23 | 2.25 |
| |
7.32 | 2.65 |
| |
22.90 | 8.28 |
| |
27.08 | 9.79 |
| Seventh lens 57 | -2.36 | -0.85 |
| |
2.04 | 0.74 |
The refractive index and the abbe number of the first lens 51, the fourth sub-lens 542 and the sixth sub-lens 561 in the optical imaging lens group respectively satisfy the following conditions:
the refractive index and the Abbe number of the first lens 51 are 1.96 and 19.4, respectively; the refractive index and the abbe number of the fourth sub-lens 542 are 1.82 and 22.4, respectively, and the refractive index and the abbe number of the sixth sub-lens 561 are 1.89 and 20.2, respectively.
The third embodiment of the present invention provides an optical imaging lens assembly; the total focal length of the whole optical imaging lens group is 2.58mm, and the field angle is 28 degrees. The parameters of the curvature radius, thickness parameter, refractive index and dispersion coefficient of each lens for imaging the scanning curved surface 06 are shown in table 8:
TABLE 8 structural parameters of the optical imaging lens group in the third embodiment
It should be noted that tables 7 and 8 are detailed structural data of the optical imaging lens assembly of the third embodiment, wherein the units of the radius of curvature, the thickness and the focal length are all millimeters, and surfaces 0 to 20 in table 8 sequentially represent the 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, the conic coefficients and the aspherical coefficients of the corresponding surfaces of the fifth lens 55 and the seventh lens 57 (both of which are aspherical lenses) are shown in table 9 below:
TABLE 9 conic coefficient and aspherical coefficient data of aspherical lens surface in example III
| Surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 11 | -9.06E-01 | 2.82E-02 | 7.00E-02 | -2.42E-02 | 4.35E-02 | -5.16E-02 | 2.57E-02 | -4.82E-03 |
| 12 | -1.66E+00 | -4.48E-02 | 1.66E-02 | -8.28E-03 | 7.33E-03 | -3.04E-03 | 6.71E-04 | -6.89E-05 |
| 16 | 9.39E-02 | 2.62E-02 | -1.25E-02 | -4.29E-04 | 3.54E-03 | -1.96E-03 | 4.82E-04 | -4.90E-05 |
| 17 | -1.43E+00 | 8.33E-02 | 1.40E-02 | -1.08E-02 | 3.34E-03 | 1.23E-02 | -8.69E-03 | 1.88E-03 |
Table 9 shows the conic coefficients and aspherical coefficient data of the aspherical lens surface in the third embodiment, where k is the conic coefficient in the aspherical curve equation, and A4 to a16 represent the 4 th to 16 th order aspherical coefficients of each surface.
In addition, referring to fig. 2b and fig. 11 in combination, the maximum effective half aperture Y1 of the third lens in the radial direction, the maximum effective half aperture Y2 of the fourth lens and the fifth lens in the radial direction, and the maximum effective half aperture Y3 of the seventh lens in the radial direction in the present embodiment satisfy the following relationship: Y1/Y2=1.28, Y3/Y2=1.53.
Furthermore, through tests, when the optical imaging lens group is used for projecting image light corresponding to a scanning surface, the graph of the optical transfer function is shown in fig. 12, the graph of the field curvature distortion is shown in fig. 13, and the graph of the vertical axis chromatic aberration is shown in fig. 14; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, the field distortion curve represents the F-Tan distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration in the direction perpendicular to the axial direction.
As can be seen from fig. 12 to 14, the optical imaging lens assembly of the third embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system in the full field of view, so that the optical imaging lens assembly can clearly image the scanning curved image of the optical fiber scanner, and has good imaging effect.
Certainly, in practical applications, the optical imaging lens assembly may further include a display element, a housing, and the like, the display 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 planar carrier, thereby achieving clear imaging.
Example four
Fig. 15 is a schematic structural view of an optical imaging lens assembly according to an embodiment of the present invention. The optical imaging lens group comprises a first lens 71, a second lens 72, a third lens 73, a fourth lens 74, a fifth lens 75, a sixth lens 76, a seventh lens 77 and an eighth lens 78 which are arranged in sequence from a first side (i.e. the side where the diaphragm 07 is located in fig. 15) to a second side (i.e. the side where the scanning curved surface 08 is located in fig. 15) in a coaxial manner.
In the present embodiment, a space is provided between each two adjacent lenses of the first lens 71, the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75, the sixth lens 76, the seventh lens 77, and the eighth lens 78, and the first lens 71, the second lens 72, the third lens 73, the fifth lens 75, the seventh lens 77, and the eighth lens 78 are six single non-cemented lenses. The fourth lens 74 is a cemented lens composed of two sub-lenses, and a fourth sub-lens 741 and a fourth sub-lens 742 are respectively disposed from the first side to the second side corresponding to the two sub-lenses; the sixth lens 76 is also a cemented lens composed of two sub-lenses, corresponding to the two sub-lenses, a sixth sub-lens 761 and a sixth sub-lens 762 respectively from the first side to the second side.
The focal lengths of the first lens 71 to the eighth lens 78 from the first side to the second side are negative, positive, negative and positive in sequence, wherein the focal lengths of the fourth sub-lens 741 and the fourth sub-lens 742 included in the fourth lens 74 are positive and negative, respectively, and the focal lengths of the sixth sub-lens 761 and the sixth sub-lens 762 included in the sixth lens 76 are negative and positive, respectively.
The first side surface and the second side surface of the first lens 71 are both concave at the paraxial region;
the first side surface and the second side surface of the second lens 72 are convex.
The first side surface of the third lens element 73 is concave at paraxial region and the second side surface is convex;
both the first side surface and the second side surface of the fourth sub-lens 741 in the fourth lens 74 are convex surfaces, and both the first side surface and the second side surface of the fourth sub-lens 742 are concave surfaces;
the first side surface of the fifth lens element 75 is concave at the paraxial region and the second side surface is convex at the paraxial region;
the first side surface and the second side surface of the sixth sub-lens 761 in the sixth lens 76 are both concave surfaces, and the first side surface and the second side surface of the sixth sub-lens 762 are both convex surfaces;
the first side surface of the seventh lens element 77 is convex at the paraxial region, and the second side surface thereof is concave at the paraxial region;
the first side surface of the eighth lens element 78 is convex and the second side surface is concave at the paraxial region.
In the present embodiment, the focal lengths of the first lens element 71 and the fourth lens element 74 in the optical imaging lens group satisfy the following relation:
0.7≤|f 1 /f general (1) |≤1.2，0.8≤|f 4-2 /f General (1) | < 1.5, wherein f 1 Is the focal length of the first lens, f 4-2 F is the focal length of the sub-lens of the fourth lens 74 close to the fifth lens 75, i.e. the focal length of the fourth sub-lens 742 General assembly The total focal length of the optical imaging lens group is shown. It should be noted that specific focal length values of each lens are shown in table 10:
TABLE 10 focal length parameter table for each lens in optical imaging lens group
The refractive index and the abbe number of the first lens 71, the fourth sub-lens 742, and the sixth sub-lens 761 in the optical imaging lens group respectively satisfy the following conditions:
the refractive index and the abbe number of the first lens 71 are 1.78 and 21.4, respectively; the refractive index and the abbe number of the fourth sub-lens 742 are 1.9 and 27.1, respectively, and the refractive index and the abbe number of the sixth sub-lens 761 are 1.83 and 21.6, respectively.
The embodiment of the utility model provides an among the optical imaging group that provides, the holistic total focal length of optical imaging group is 2.58mm, and the angle of vision is 28 degrees. The parameters of the curvature radius, thickness parameter, refractive index, and dispersion coefficient of each lens for imaging the scanning curved surface 08 are shown in table 11:
TABLE 11 structural parameters of the optical imaging lens assembly of example four
It should be noted that tables 10 and 11 are detailed structural data of the optical imaging lens assembly of the fourth embodiment, wherein the units of the radius of curvature, the thickness and the focal length are all millimeters, and surfaces 0-20 in table 11 sequentially represent the surfaces from the first side to the second side; an optical surface in the imaging plane with a radius of curvature of "infinity" is referred to as a flat surface.
Further, the conic coefficients and aspherical conic coefficients of the corresponding surfaces of the fifth lens 75 and the seventh lens 77 (both of which are aspherical lenses) are shown in table 12 below:
TABLE 12 conic and aspherical coefficient data for different lens surfaces in example four
| Surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 11 | -9.69E-01 | 6.51E-02 | 3.83E-02 | -2.30E-02 | 4.47E-02 | -5.37E-02 | 2.70E-02 | -4.99E-03 |
| 12 | -1.81E+00 | -2.00E-02 | 1.53E-02 | -7.08E-03 | 7.45E-03 | -3.20E-03 | 6.67E-04 | -6.24E-05 |
| 16 | -6.75E-01 | 5.42E-02 | -2.09E-02 | 1.51E-03 | 4.48E-03 | -2.00E-03 | 3.54E-04 | -2.26E-05 |
| 17 | -1.51E+00 | 2.09E-01 | -1.20E-01 | 5.20E-02 | 1.77E-02 | 3.09E-04 | -1.21E-02 | 3.86E-03 |
Table 12 shows data of conic coefficients and aspherical coefficients in the fourth embodiment, where k is a conic coefficient in an aspherical surface curve equation, and A4 to a16 represent aspherical coefficients of orders 4 to 16 of each surface.
In addition, referring to fig. 2b and fig. 15 in combination, the maximum effective half aperture Y1 of the third lens in the radial direction, the maximum effective half aperture Y2 of the fourth lens and the fifth lens in the radial direction, and the maximum effective half aperture Y3 of the seventh lens in the radial direction in the present embodiment satisfy the following relationship: Y1/Y2=1.31, Y3/Y2=1.5.
Furthermore, through tests, when the optical imaging lens group is used for projecting image light corresponding to a scanning surface, the graph of the optical transfer function is shown in fig. 16, the graph of the field curvature distortion is shown in fig. 17, and the graph of the vertical axis chromatic aberration is shown in fig. 18; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, the field distortion curve represents the F-Tan distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration in the direction perpendicular to the axial direction.
As can be seen from fig. 16-18, the optical imaging lens assembly of the fourth embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system in the full field of view, so that the optical imaging lens assembly can clearly image the scanning curved image of the optical fiber scanner, and has good imaging effect.
Certainly, in practical applications, the optical imaging lens assembly may further include a display element, a housing, and the like, the display 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 planar carrier, thereby achieving clear imaging.
EXAMPLE five
Fig. 19 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 91, a second lens 92, a third lens 93, a fourth lens 94, a fifth lens 95, a sixth lens 96, a seventh lens 97 and an eighth lens 98 which are coaxially arranged in sequence from a first side (i.e. the side where the diaphragm 09 is located in fig. 19) to a second side (i.e. the side where the scanning curved surface 10 is located in fig. 19).
In the present embodiment, each two adjacent lenses of the first lens 91, the second lens 92, the third lens 93, the fourth lens 94, the fifth lens 95, the sixth lens 96, the seventh lens 97, and the eighth lens 98 have a space therebetween, and the first lens 91, the second lens 92, the third lens 93, the fifth lens 95, the seventh lens 97, and the eighth lens 98 are six single non-cemented lenses. The fourth lens 94 is a cemented lens composed of two sub-lenses, and the corresponding sub-lenses are the fourth sub-lens 941 and the fourth sub-lens 942 from the first side to the second side; the sixth lens 96 is also a cemented lens composed of two sub-lenses, and the sixth sub-lenses 961 and 962 are provided from the first side to the second side, respectively, corresponding to the two sub-lenses.
Focal lengths of the first lens 91 to the eighth lens 98 from the first side to the second side are negative, positive, negative and positive in sequence, wherein focal lengths of the fourth sub-lens 941 and the fourth sub-lens 942 included in the fourth lens 94 are positive and negative respectively, and focal lengths of the sixth sub-lens 961 and the sixth sub-lens 962 included in the sixth lens 96 are negative and positive respectively.
The first side surface and the second side surface of the first lens 91 are both concave at the paraxial region;
the first and second side surfaces of the second lens 92 are convex.
The first side surface of the third lens element 93 is concave at paraxial region and the second side surface is convex;
both the first side surface and the second side surface of the fourth sub-lens 941 in the fourth lens 94 are convex surfaces, and both the first side surface and the second side surface of the fourth sub-lens 942 are concave surfaces;
the first side surface of the fifth lens element 95 is concave at the paraxial region and the second side surface is convex at the paraxial region;
the first and second side surfaces of the sixth sub-lens 961 in the sixth lens 96 are concave, and the first and second side surfaces of the sixth sub-lens 962 are convex;
the first side surface of the seventh lens element 97 is convex at the paraxial region and the second side surface is concave at the paraxial region;
the first side surface of the eighth lens element 98 is convex and the second side surface is concave at the paraxial region.
In the present embodiment, the focal lengths of the first lens element 91 and the fourth lens element 94 in the optical imaging lens group satisfy the following relation:
0.7≤|f 1 /f general (1) |≤1.2，0.8≤|f 4-2 /f General (1) | < 1.5, wherein f 1 Is the focal length of the first lens, f 4-2 The focal length of the sub-lens of the fourth lens 94 close to the fifth lens 95, i.e. the focal length of the fourth sub-lens 942, f General assembly The total focal length of the optical imaging lens group is shown. It should be noted that specific focal length values of each lens are shown in table 13:
TABLE 13 focal length parameter table for each lens in optical imaging lens group
| Lens | Focal length | Lens focal length/total lens focal length |
| First lens 91 | -2.83 | -1.05 |
| |
4.74 | 1.75 |
| |
7.65 | 2.83 |
| |
22.83 | 8.45 |
| |
4.10 | 1.52 |
| Fourth sub-lens 942 | -3.80 | -1.41 |
| Fifth aspect of the |
5.88 | 2.18 |
| |
23.76 | 8.80 |
| Sixth sub-lens 961 | -17.03 | -6.31 |
| |
11.75 | 4.35 |
| Seventh lens 97 | -9.32 | -3.45 |
| |
6.34 | 2.35 |
The refractive index and the abbe number of the first lens 91, the fourth sub-lens 942 and the sixth sub-lens 961 in the optical imaging lens group respectively satisfy the following conditions:
the refractive index and the abbe number of the first lens 91 are 1.79 and 23, respectively; the refractive index and the abbe number of the fourth sub-lens 942 are 1.72 and 24, respectively, and the refractive index and the abbe number of the sixth sub-lens 961 are 1.77 and 21.8, respectively.
The embodiment of the utility model provides an among the optical imaging group that five provided, the holistic total focal length of optical imaging group is 2.58mm, and the angle of vision is 28 degrees. The parameters of the curvature radius, thickness parameter, refractive index and dispersion coefficient of each lens for imaging the scanning curved surface 10 are shown in table 14:
TABLE 14 structural parameters of the optical imaging lens assembly of the fifth embodiment
It should be noted that tables 13 and 14 are detailed structural data of the optical imaging lens assembly of the fifth embodiment, wherein the units of the radius of curvature, the thickness and the focal length are all millimeters, and surfaces 0 to 20 in table 14 sequentially represent the surfaces from the first side to the second side; an optical surface in the imaging plane with a radius of curvature of "infinity" is referred to as a flat surface.
Further, the conic coefficients and aspherical coefficients of the surfaces corresponding to the fifth lens 95 and the seventh lens 97 (both of which are aspherical lenses) are shown in table 15 below:
TABLE 15 conic coefficient and aspherical coefficient data of aspherical lens surface in example V
| Surface of | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 11 | -1.06E+00 | 8.34E-02 | 2.36E-02 | -3.28E-02 | 5.08E-02 | -5.02E-02 | 2.39E-02 | -4.39E-03 |
| 12 | -1.58E+00 | -2.26E-02 | 1.38E-02 | -8.06E-03 | 7.33E-03 | -3.26E-03 | 7.23E-04 | -6.72E-05 |
| 16 | -5.11E-01 | 5.29E-02 | -1.64E-02 | -3.02E-04 | 4.32E-03 | -1.84E-03 | 3.24E-04 | -1.81E-05 |
| 17 | -5.21E+00 | 1.35E-01 | -7.26E-02 | 2.82E-02 | -1.63E-03 | 2.82E-03 | -3.58E-03 | 9.62E-04 |
Table 15 shows the conic coefficients and aspherical coefficients in the fifth embodiment, where k is the conic coefficient in the aspherical surface curve equation, and A4 to a16 represent the 4 th to 16 th order aspherical coefficients of each surface.
In addition, referring to fig. 2b and fig. 19 in combination, in this embodiment, the maximum effective half aperture Y1 of the third lens in the radial direction, the maximum effective half aperture Y2 of the two opposite surfaces of the fourth lens and the fifth lens in the radial direction, and the maximum effective half aperture Y3 of the seventh lens in the radial direction satisfy the following relationship: Y1/Y2=1.36, Y3/Y2=1.41.
Further, through tests, when the optical imaging lens group is used for projecting image light corresponding to a scanning surface, an optical transfer function curve graph is shown in fig. 20, a field curvature distortion curve graph is shown in fig. 21, and a vertical axis chromatic aberration curve graph is shown in fig. 22; wherein, the Modulation Transfer Function (MTF) represents the comprehensive resolution level of an optical system, the field distortion curve represents the F-Tan distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration in the direction perpendicular to the axial direction.
As can be seen from fig. 20 to fig. 22, the optical imaging lens assembly of the fifth embodiment has good imaging resolution and small distortion and chromatic aberration of the optical system in the full field of view, so that the optical imaging lens assembly can clearly image the scanning curved image of the optical fiber scanner, and has good imaging effect.
Certainly, in practical applications, the optical imaging lens assembly may further include a display element, a housing, and the like, the display 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 planar carrier, thereby achieving clear imaging.
Scanning display device
The optical imaging lens group can cooperate with an optical fiber scanner (or a corresponding optical fiber scanning module) to form a scanning display device in the embodiment of the present application (as shown in fig. 1a and 1b, the optical imaging lens group is disposed on a light emitting path of the optical fiber scanner), wherein a first side of the optical imaging lens group faces a light emitting direction of the optical fiber scanner, and a preferred mode is that the optical imaging lens group is coaxial with a central optical axis of the optical fiber scanner. Of course, the structure and the general principle of the optical fiber scanner can refer to the corresponding contents of fig. 1a and 1b, and redundant description is omitted here.
Near-to-eye display device
In the present application, the scanning display device may be further applied to a near-eye display device, and may be used in conjunction with a near-eye display module to form a near-eye display device in the embodiment of the present application, and the near-eye display device is used as a head-mounted AR device (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, and is scanned and output to the optical display mirror group by the optical fiber scanner therein, the scanning curved surface (refer to the scanning curved surface 02 in fig. 3 and the scanning curved surface 230 in fig. 2 a) of the optical fiber scanner passes through the optical display mirror group and is converted into an imaging plane (refer to the imaging plane 240 in fig. 2 a), and the imaging plane is coupled into the waveguide as the entrance pupil surface of the waveguide, and is then coupled out through waveguide expansion imaging to enter the human eye.
As another possible implementation manner, the scanning display apparatus may further cooperate with the near-eye display module to form a near-eye display device in the embodiment of the present application, and the near-eye display device is used as a head-mounted VR device (e.g., VR headset/glasses). The scanning display device is arranged in the near-eye display module.
In the embodiment of the application, focal lengths of five lenses with the same optical axis of the optical imaging lens group are reasonably and optimally set, so that focal power of a system can be reasonably dispersed, aberration generated by the lenses is reduced, 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 field angle; the imaging quality and the field angle are further improved by limiting and optimizing the refractive index, the dispersion coefficient and the surface structure of the five lenses with the same optical axis; through limiting and optimizing five lenses with the same optical axis to be designed into an aspheric surface-shaped structure, the imaging quality is further improved, the overall structure of the optical imaging lens group is more compact, and the production requirement of miniaturization of lens products is met.
The above embodiments are merely preferred embodiments of the present application, and the embodiments are only used for illustrating the technical solutions of the present application and not for limiting the present application, and all technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or effective experiments according to the concepts of the present application should be within the scope of the present application.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences 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 an element 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 is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are coaxially arranged from a first side to a second side in sequence, wherein the focal lengths corresponding to the first lens, the second lens, the third lens and the sixth lens are respectively negative, positive and positive;
the first lens and the optical imaging lens group have the following relations: f is more than or equal to 0.7 1 /f General assembly | ≦ 1.2, wherein, the f 1 Is the focal length of the first lens, said f General assembly The total focal length of the optical imaging lens group is obtained.
2. The optical imaging lens group of claim 1, wherein the first lens element, the second lens element, the third lens element, the fourth lens element, the sixth lens element and the eighth lens element are all spherical lenses;
the fifth lens and the seventh lens are both aspheric lenses.
3. The optical imaging lens group of claim 2, wherein the fourth lens and the sixth lens are spherical cemented lenses.
4. The optical imaging lens group of claim 3, wherein the fourth lens and the sixth lens each comprise two sub-lenses, wherein the two sub-lenses of the fourth lens are arranged from the first side to the second side in a common optical axis and have positive and negative corresponding focal lengths, respectively; the two sub-lenses of the sixth lens are arranged from the first side to the second side in a coaxial mode, and the positive and negative of the corresponding focal length are respectively negative and positive.
5. The optical imaging lens group of claim 4, wherein the second side surface of the fourth lens element adjacent to the sub-lens element of the fifth lens element is concave; the first side surface of the fifth lens is a concave surface.
6. The optical imaging lens group of claim 4, wherein the focal lengths of the fourth, fifth, seventh and eighth lenses are negative, positive and positive, respectively;
said fourth lens being in close proximity toThe sub-lens of the fifth lens and the optical imaging lens group have the following relation: f is more than or equal to 0.8 4-2 /f General (1) | < 1.5, wherein f 4-2 Is the focal length of the sub-lens of the fourth lens close to the fifth lens, f General assembly The total focal length of the optical imaging lens group is obtained.
7. The optical imaging lens group of claim 4, wherein the maximum effective half aperture of the third lens element along the radial direction is Y1, the maximum effective half apertures of the two opposite surfaces of the fourth lens element and the fifth lens element along the radial direction are the same and are Y2, and the maximum effective half aperture of the seventh lens element along the radial direction is Y3;
wherein said Y1 and said Y2 have the following relationship: Y1/Y2 is more than or equal to 1 and less than or equal to 1.4;
said Y2 and said Y3 have the following relationship: Y3/Y2 is more than or equal to 1.4 and less than or equal to 1.7.
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;
wherein, the fiber scanner comprises an actuator and an optical fiber fixed on the actuator, the part of the optical fiber exceeding the actuator forms a fiber cantilever, and the fiber cantilever is driven by the actuator to perform two-dimensional scanning.
9. A near-eye display apparatus, wherein the near-eye display apparatus is used as a head-mounted augmented 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.
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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