WO2023065704A1 - Optical imaging lens group, scanning display apparatus, and near-eye display device - Google Patents

Abstract

An optical imaging lens group (123), a scanning display apparatus, and a near-eye display device, relating to the technical field of scanning display. In the optical imaging lens group (123), the surface type structure and radius of curvature of a lens (15) close to a curved surface image in multiple co-optical axial lenses (11-15) in the optical imaging lens group are defined, such that the lens can match with a corresponding scanning radius, and clear imaging from the curved surface image to a flat image is achieved; by means of a reasonable number of lens combination configurations, the optical imaging lens group (123) can coordinate and balance the requirements of imaging quality, miniaturization and processing technology according to a change in an application scenario; the focal length, refractive index, dispersion coefficient, and surface type structure of some of the multiple lenses (11-15) are defined and optimized to further improve the imaging quality.

Description

Optical imaging mirror group, scanning display device and near-eye display device

This application claims priority to Chinese Patent Application No. 2021112283868, filed on October 21, 2021, entitled "Optical Imaging Mirror Group, Scanning Display Device, and Near-Eye Display Device", the entire content of which is incorporated herein by reference middle.

technical field

The present application relates to the technical field of scanning display, in particular to an optical imaging mirror group, a scanning display device and a near-eye display device.

Background technique

As an emerging display technology, scanning display imaging can be used in various application scenarios such as projection display and near-eye display.

However, in the existing scanning display imaging system, there are disadvantages such as high processing difficulty, high mass production cost, poor imaging quality, small field of view, and inability to miniaturize at the same time, which makes the scanning display imaging technology popular in the market. In particular, when scanning display imaging is applied to the scene of near-eye display, due to the particularity of optical fiber scanning surface image, limited by the imaging effect and the influence of field of view, it has not been able to meet the requirements of near-eye display. The performance requirements of medium and high resolution hinder the development of near-eye display to the consumer market.

Contents of the invention

The purpose of the present application is to provide an optical imaging lens group, a scanning display device and a near-eye display device, so as to solve the above-mentioned technical problems existing in the prior art.

An embodiment of the present application provides an optical imaging lens group, the optical imaging lens group includes a plurality of lenses, and at least one negative lens is included in the plurality of lenses;

A plurality of lenses are sequentially arranged on a common optical axis from the first side to the second side of the optical imaging lens group, the second side of the optical imaging lens group corresponds to a curved surface image, and the first side of the optical imaging lens group corresponds to a plane image;

The surface of the lens near and opposite the curved image is concave.

Optionally, the radius of curvature of the concave surface is 0.4-5.15mm.

Optionally, the number of the plurality of lenses is 3 or 4 or 5 or 6 or 7 or 8.

Optionally, the concave surface is located at the near optical axis of the corresponding lens surface.

Optionally, the lens surface opposite the curved image is convex at the far optical axis.

Optionally, there is _always the following relationship between the focal length _fi and f of at least one of the lenses:

0.2≤|f _i /f _total |≤1.2, where f is _always the focal length of the optical imaging lens group, f _i is the focal length of the i-th lens along the optical axis from the first side to the second side in sequence, and i is greater than An integer equal to 1.

Optionally, the focal length _f of at least one negative lens among the plurality of lenses has the _following relationship with f:

0.2≤| _fnegative / _ftotal |≤1.0, wherein, _ftotal is the focal length of the optical imaging lens group, and _fnegative is the focal length of the negative lens among the plurality of lenses.

Optionally, the focal _length f of only one negative lens among the multiple lenses has the _following relationship with f:

0.2≤| _fnegative / _ftotal |≤1.0, wherein, _ftotal is the focal length of the optical imaging lens group, and _{fnegative is} the focal length of the negative lens among the plurality of lenses.

Optionally, the Abbe number of at least one negative lens is in the range of 16-33.

Optionally, the refractive index of the negative lens with the smallest Abbe number among the multiple lenses satisfies the following relationship:

If the negative lens with the smallest Abbe number is a plastic lens, the corresponding refractive index range is between 1.5 and 1.7.

Optionally, if the negative lens with the smallest Abbe number is a glass lens, the corresponding refractive index range is between 1.7-1.9.

Optionally, among the multiple lenses, a negative lens and a positive lens whose absolute value of the focal length ratio is the smallest satisfy the following relationship:

The range of f _negative /f _total + f _positive /f _total is between (-0.5, 0.5), where f _negative is the focal length of the negative lens with the smallest absolute value of focal length among multiple lenses, and f _positive is the focal length of multiple lenses The focal length of the positive lens with the smallest absolute value of the focal length ratio, f _{is always} the focal length of the optical imaging lens group.

Optionally, the range of f _negative /f _total + f _positive /f _total is between (-0.25, 0.25).

Optionally, the two lenses close to the curved image have two adjacent lens surfaces, and the two adjacent lens surfaces are both convex.

Optionally, the second lens and the third lens close to the curved image have two adjacent lens surfaces, and the adjacent two lens surfaces are convex and concave at the near optical axis.

Optionally, a plurality of lenses are arranged and connected at intervals.

An embodiment of the present application also provides a scanning display device, which includes a fiber optic scanner and the aforementioned optical imaging mirror group, the fiber optic scanner is used to scan and output the light of the image to be displayed, and the optical imaging mirror group is used to output the optical fiber scanner The scanning surface corresponding to the light is enlarged and imaged and projected;

Wherein, the optical fiber scanner includes an actuator and an optical fiber fixed on the actuator, the part of the optical fiber exceeding the actuator forms an optical fiber cantilever, and the optical fiber cantilever performs two-dimensional scanning under the drive of the actuator.

The embodiment of the present application also provides a near-eye display device, which is used as a head-mounted augmented reality device, and at least includes a near-eye display module and according to the above-mentioned scanning display device, the scanning display device is arranged in the near-eye display module.

The embodiment of the present application also provides a near-eye display device, which is used as a head-mounted virtual reality device, and at least includes a near-eye display module and according to the above-mentioned scanning display device, the scanning display device is arranged in the near-eye display module.

Adopting the technical solutions in the embodiments of the present application can achieve the following technical effects:

In the embodiment of the present application, by limiting the lens surface structure and curvature radius close to the curved surface image in the multiple coaxial lenses of the optical imaging lens group, it can match the radius of the corresponding scanning curved surface, so as to realize from the curved surface Clear imaging from image to plane image; through a reasonable number of lens combination configurations, the optical imaging lens group can coordinate and balance the requirements of imaging quality, miniaturization and processing technology according to changes in application scenarios.

Furthermore, the imaging quality is further improved by limiting and optimizing the focal length, refractive index, dispersion coefficient and surface structure of some lenses among the plurality of lenses.

Other features and advantages of the present application will be set forth in the following description, and partly become obvious from the description, or can be understood by implementing the technical solutions of the present application. The objectives and other advantages of the application can be realized and obtained by the structures and/or processes particularly pointed out in the specification, claims and accompanying drawings.

Description of drawings

Other characteristics, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1a and Fig. 1b are structural schematic diagrams of an illustrative scanning display system;

Fig. 2 is a schematic diagram of the scanning output of the optical fiber scanner provided by the embodiment of the present application;

Fig. 3 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 1 of the present application;

Fig. 4 is the MTF curve diagram of the optical imaging lens group in the first embodiment of the present application;

Fig. 5 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 1 of the present application;

FIG. 6 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 1 of the present application.

FIG. 7 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 2 of the present application;

Fig. 8 is the MTF curve diagram of the optical imaging lens group in the second embodiment of the present application;

Fig. 9 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 2 of the present application;

Fig. 10 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 2 of the present application;

Fig. 11 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 3 of the present application;

Fig. 12 is the MTF curve diagram of the optical imaging lens group in the third embodiment of the present application;

Fig. 13 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 3 of the present application;

Fig. 14 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 3 of the present application;

FIG. 15 is a schematic structural view of an optical imaging lens group provided in Embodiment 4 of the present application;

Fig. 16 is an MTF curve diagram of the optical imaging lens group in Embodiment 4 of the present application;

Fig. 17 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 4 of the present application;

Fig. 18 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 4 of the present application;

Fig. 19 is a schematic structural view of an optical imaging mirror set provided in Embodiment 5 of the present application;

Fig. 20 is the MTF curve diagram of the optical imaging lens group in Embodiment 5 of the present application;

Fig. 21 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 5 of the present application;

Fig. 22 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 5 of the present application;

Fig. 23 is a schematic structural view of an optical imaging mirror set provided in Embodiment 6 of the present application;

Fig. 24 is the MTF curve diagram of the optical imaging lens group in the sixth embodiment of the present application;

Fig. 25 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 6 of the present application;

Fig. 26 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 6 of the present application;

Fig. 27 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 7 of the present application;

Fig. 28 is an MTF curve diagram of the optical imaging lens group in Embodiment 7 of the present application;

Fig. 29 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 7 of the present application;

Fig. 30 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 7 of the present application;

Fig. 31 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 8 of the present application;

Fig. 32 is the MTF curve diagram of the optical imaging lens group in the eighth embodiment of the present application;

Fig. 33 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 8 of the present application;

Fig. 34 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 8 of the present application;

Fig. 35 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 9 of the present application;

Fig. 36 is the MTF curve diagram of the optical imaging lens group in Embodiment 9 of the present application;

Fig. 37 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 9 of the present application;

Fig. 38 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 9 of the present application;

Fig. 39 is a schematic structural view of an optical imaging mirror set provided in Embodiment 10 of the present application;

Fig. 40 is the MTF curve diagram of the optical imaging lens group in the tenth embodiment of the present application;

Fig. 41 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 10 of the present application;

Fig. 42 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 10 of the present application;

Fig. 43 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 11 of the present application;

Fig. 44 is the MTF curve diagram of the optical imaging lens group in the eleventh embodiment of the present application;

Fig. 45 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 11 of the present application;

Fig. 46 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 11 of the present application;

Fig. 47 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 12 of the present application;

Fig. 48 is the MTF curve diagram of the optical imaging lens group in Embodiment 12 of the present application;

Fig. 49 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 12 of the present application;

Fig. 50 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 12 of the present application;

Fig. 51 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 13 of the present application;

Fig. 52 is the MTF curve diagram of the optical imaging lens group in the thirteenth embodiment of the present application;

Fig. 53 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 13 of the present application;

Fig. 54 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 13 of the present application;

Fig. 55 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 14 of the present application;

Fig. 56 is the MTF curve diagram of the optical imaging lens group in the fourteenth embodiment of the present application;

Fig. 57 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 14 of the present application;

Figure 58 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 14 of the present application;

Fig. 59 is a schematic structural view of an optical imaging mirror set provided in Embodiment 15 of the present application;

Fig. 60 is the MTF curve diagram of the optical imaging lens group in the fifteenth embodiment of the present application;

Fig. 61 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 15 of the present application;

Fig. 62 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 15 of the present application;

Fig. 63 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 16 of the present application;

Fig. 64 is the MTF curve diagram of the optical imaging lens group in the sixteenth embodiment of the present application;

Fig. 65 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 16 of the present application;

Fig. 66 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 16 of the present application;

Fig. 67 is a schematic structural diagram of an optical imaging mirror set provided in Embodiment 17 of the present application;

Fig. 68 is the MTF curve diagram of the optical imaging lens group in the seventeenth embodiment of the present application;

Fig. 69 is a curve diagram of field curvature distortion of the optical imaging lens group in Embodiment 17 of the present application;

Fig. 70 is a vertical axis chromatic aberration diagram of the optical imaging lens group in Embodiment 17 of the present application.

Icons: 100-processor; 110-laser group; 120-fiber scanning module; 130-transmission fiber; 140-light source modulation circuit; 150-scanning drive circuit; 160-beam combining unit; 121-scanning actuator; 121a -slow axis; 121b-fast axis; 122-fiber cantilever; 123-mirror group; 124-scanner package; 125-fixture; 230-scanning curved surface; Two lenses; 13-third lens; 14-fourth lens; 15-fifth lens; 01-stop; 02-scanning curved surface; 31-first lens; 32-second lens; 33-third lens; 34 -fourth lens; 35-fifth lens; 03-stop; 04-scanning curved surface; 51-first lens; 52-second lens; 53-third lens; 54-fourth lens; 55-fifth lens ;05-stop; 06-scanning curved surface; 71-first lens; 72-second lens; 73-third lens; 74-fourth lens; 75-fifth lens; 76-sixth lens; 07-light Diaphragm; 08-scanning curved surface; 91-first lens; 92-second lens; 93-third lens; 94-fourth lens; 95-fifth lens; 09-stop; 10-scanning curved surface; 21-light Stop; 22-scanning surface; 23-stop; 24-scanning surface; 25-stop; 26-scanning surface; 27-stop; 28-scanning surface; 29-stop; 30-scanning surface; 41-light Stop; 42-scanning surface; 43-stop; 44-scanning surface; 45-stop; 46-scanning surface; 47-stop; 48-scanning surface; 49-stop; 50-scanning surface; 61-light stop; 62-scanned surface; 63-stop; 64-scanned surface.

Detailed ways

The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

Illustrative Scan Display System

For the current scanning display imaging, it can be realized by a digital micromirror device (Digital Micromirror Device, DMD) or a fiber scanning display (Fiber Scanning Display, FSD) device. Among them, the FSD scheme is a new scanning display imaging method, and the scanning output of the image is realized through the optical fiber scanner. In order to enable those skilled in the art to clearly understand the solution of the present application, a brief principle of optical fiber scanning imaging and a corresponding system are described below.

As shown in Figure 1a, it is an illustrative scanning display system in this application, which mainly includes:

Processor 100 , laser group 110 , optical fiber scanning module 120 , transmission optical fiber 130 , light source modulation circuit 140 , scanning driving circuit 150 and beam combining unit 160 . in,

The processor 100 may be a graphics processing unit (Graphics Processing Unit, GPU), a central processing unit (Central Processing Unit, CPU) or other chips or circuits with control functions and image processing functions, which are not specifically limited here.

When the system is working, the processor 100 can control the light source modulation circuit 140 to modulate the laser group 110 according to the image data to be displayed. The laser group 110 includes a plurality of monochromatic lasers that emit beams of different colors. It can be seen from FIG. 1a and FIG. 1b that the laser group 110 may specifically use red (Red, R), green (Green, G) and blue (Blue, B) three-color lasers. 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 scanning driving circuit 150 to drive the fiber scanner in the fiber scanning module 120 to scan, so as to scan and output the light beam transmitted in the transmission fiber 130 .

The light beam scanned by the fiber optic scanner acts on a certain pixel position on the surface of the medium, and forms a light spot on the pixel position, thus realizing the scanning of the pixel position. Driven by the fiber scanner, the output end of the transmission fiber 130 is swept along a certain scanning track, so that the light beam moves to the corresponding pixel position. During the actual scanning process, the light beam output by the transmission fiber 130 will form a light spot with corresponding image information (such as color, gray scale or brightness) at each pixel position. In one frame time, the light beam traverses each pixel position at a high enough speed to complete the scanning of one frame of image. Since the human eye observes things with the characteristics of "visual residue", the human eye cannot perceive the light beam at each pixel point. positional movement, but see a complete image.

Continuing to refer to FIG. 1 b , it is the specific structure of the fiber optic scanning module 120 , which includes: a scanning actuator 121 , a fiber optic cantilever 122 , a mirror group 123 , a scanner package 124 and a fixing member 125 . The scanning actuator 121 is fixed in the scanner package 124 through the fixing piece 125, and the transmission fiber 130 extends at the front end of the scanning actuator 121 to form an optical fiber cantilever 122 (also referred to as a scanning fiber). During operation, the scanning actuator 121 is driven by the scanning drive signal, and its slow axis 121a (also called the first actuating part) is along the vertical direction (this vertical direction is parallel to the Y axis in the reference coordinate system in Fig. 1a and Fig. 1b, in this application , the vertical direction can also be referred to as the first direction) to vibrate, and its fast axis 121b (also referred to as the second actuating part) is along the horizontal direction (the horizontal direction is parallel to X in the reference coordinate system in Fig. 1a and Fig. 1b axis, in this application, the horizontal direction can also be referred to as the second direction) vibration, driven by the scanning actuator 121, the front end of the fiber cantilever 122 performs two-dimensional scanning according to the preset trajectory and emits a beam, and the emitted beam is then Scanning imaging can be realized through the lens group 123 . Generally, the structure formed by the scanning actuator 121 and the fiber cantilever 122 can be called a fiber scanner.

As shown in FIG. 1b and FIG. 2 , in the embodiment of the present application, through the movement of the fast axis 121b and the slow axis 121a, the motion track of the optical fiber output end forms a scanning curved surface 230 , which is transformed into an imaging plane 240 after passing through the corresponding mirror group 123 . When applied to a near-eye display device such as an augmented reality (Augmented Reality, AR) device, the imaging plane 240 couples the entrance pupil as a waveguide into the waveguide for imaging to be viewed by the human eye. It should be emphasized that the optical fiber scanning display system is used as the display image source of AR glass, because the optical fiber scanning optical machine uses a drive device to drive the fiber cantilever to resonate, and the entire light output end surface is a curved surface, which is different from the plane image source of traditional display technology. Correspondingly, it is necessary to design the imaging lens in a targeted manner to solve the problem of unclear imaging.

In order to facilitate expression and make those skilled in the art easily understand the scheme of the present application, it should be noted that the optical imaging lens group (mirror group 123 as shown in Figure 2) in the present application is used as the eyepiece, through the optical imaging lens group The function of scanning curved surface 230 can be converted into imaging plane 240 (in actual application, the transmission direction of light is: the direction from scanning curved surface 230 to imaging plane 240), so that the optical imaging mirror group corresponds to a part of imaging plane 240 The side of the optical imaging lens group corresponding to the scanning curved surface 230 is called the second side. In the following content, the embodiment solutions of the optical imaging lens group will be described with reference to "the first side" and "the second side". And, the description in 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 the surface of the X-th lens facing the first side, and "the X-th lens The "second side surface" refers to the surface of the X-th lens facing the second side, where X is one, two, three, four, five, six, seven or eight.

It should be further explained that in the field of projection, the image corresponding to the first side is a plane image, and the corresponding plane image carrier can be a projection screen, curtain or wall, etc., and the image corresponding to the second side is a curved surface image, that is, an optical fiber The arc-shaped scanning surface scanned by the scanner or emitted by other image sources; in the field of photography, the optical path is opposite to that in the field of projection. The first side generally corresponds to the side of the object that collects image information, and the second The side corresponds generally to the side of the image obtained by collecting and imaging.

Optical Imaging Mirror Group

The optical imaging lens group in the embodiment of the present application includes a plurality of lenses, and at least one negative lens is included in the plurality of lenses; the plurality of lenses are sequentially arranged on a common optical axis from the first side to the second side of the optical imaging lens group, and the optical imaging lens The second side of the group corresponds to a curved image, and the first side of the optical imaging lens group corresponds to a plane image. The types of lenses are divided into negative lenses and positive lenses. Negative lenses are also called concave lenses. Concave lenses have a divergent effect on light, also known as "divergent lenses". Positive lenses are also called convex lenses. Convex lenses have a converging effect on light, also known as "converging lenses". It should be noted that the lens surface close to the curved image and opposite to the curved image is a concave surface. It should be emphasized that by limiting the surface structure of the lens surface opposite to the curved image as a concave surface (that is, limiting the lens surface closest to the curved image as a concave surface), it can be well adapted to the light rays of the curved image, ensuring When the curved surface image enters the optical imaging lens group, each point light source has the smallest incident angle and refraction angle on the concave surface, thereby reducing aberrations and achieving the technical effect of improving imaging quality.

Further, in the embodiments provided by the present application, the concave surface of the lens surface closest to the curved image corresponds to a radius of curvature of 0.4-5.15 mm, optionally, the radius of curvature is 0.4-0.7 mm or 0.76-1.24 mm or 1.26-5.15 mm mm. It should be noted that by limiting the radius of curvature of the concave surface, the parameters of the concave surface are defined by quantitative standards in essence, so that the curvature of the concave surface can be more accurately adapted to the requirements of imaging different curved surface images into planar images. At the same time, the introduction of quantitative standards for the radius of curvature of the concave surface enables more precise control in processing technology and quality control.

Further, the number of multiple lenses provided in the embodiment of the present application is preferably 3 or 4 or 5 or 6 or 7 or 8, more preferably 4 or 5 or 6 or 7 indivual. It should be noted that through a reasonable number of lens combination configurations, the optical imaging lens group can coordinate and balance the requirements of imaging quality, miniaturization and processing technology according to changes in application scenarios, such as product requirements for miniaturization or miniaturization. Higher than the requirements of imaging quality, then under the basic requirement of ensuring imaging quality, we can process and produce products with as few lenses as possible, such as 4 lenses; and if the application scenarios and requirements of the product pay more attention to imaging quality , there are no strict requirements for processing manufacturability and miniaturization, the number of 7 or 8 lenses can be used to design and produce the optical imaging lens group; of course, in the specific product design process, according to the product application scenario, through reasonable The quantity is used to balance the requirements of the optical imaging lens group in different situations. It should be emphasized that, in other embodiments of the present application, it is not limited to the preferred number of multiple lenses (3 or 4 or 5 or 6 or 7 or 8) provided by the embodiment of the present application, and may also It is the number of other lenses, such as 2, 9, 11, etc., which can be flexibly configured according to the application scenarios and product requirements of the optical imaging lens group.

Further optionally, the concave surface is located at the near optical axis of the corresponding lens surface. It should be noted that by optionally defining the concave surface to be located at the near optical axis of the corresponding lens surface, on the one hand, the size of the scanned curved surface image can be well adapted, and on the other hand, it can make the light of the scanned curved surface image enter the concave surface more smoothly. Concentrate, reduce stray light and astigmatism, and effectively improve imaging quality. It should be emphasized that, further optionally, when the lens surface where the concave surface is located is an aspheric surface structure, the lens surface opposite to the curved image is convex at the far optical axis, that is to say, the lens surface is at the near optical axis at this time. It is concave at the far optical axis and convex at the far optical axis. It should be noted that the near optical axis refers to the area of the lens surface close to the optical axis, that is, the central area, and the far optical axis refers to the area of the lens surface away from the optical axis, that is, the edge area.

Further optionally, the two lenses close to the curved image have two adjacent lens surfaces, and the two adjacent lens surfaces are both convex. The second lens and the third lens close to the curved image have two adjacent lens surfaces, and the adjacent two lens surfaces are convex and concave at the near optical axis. It should be noted that by defining the two lenses close to the curved surface image (that is, the two lenses closest to the curved surface image along the optical axis direction) corresponding to the adjacent two lens surfaces as convex surfaces, not only makes the light of the optical imaging lens group The focal power has been well distributed, and because the surface structure of the first few lenses close to the curved image is very important for the aberration correction of the entire optical imaging lens group, by controlling the first few lens surfaces close to the curved image Type structure, which can maximize the stability of the basic structure of the optical imaging lens group and the final imaging quality control, and reduce the sensitivity to imaging quality when other lenses are deployed.

Further, the focal length f _i and f _total of at least one of the lenses have the following relationship: 0.2≤|f _i /f _total |≤1.2, wherein f is _always the focal length of the optical imaging lens group, that is, the optical imaging mirror The total focal length of the group, f _i is the focal length of the i-th lens in sequence from the first side to the second side along the optical axis, i is an integer greater than or equal to 1, that is to say, f _i may be any lens among multiple lenses focal length. Preferably, when _fi is a negative lens, correspondingly, the focal _length f of at least one negative lens among the plurality of lenses has the following relationship with _ftotal : 0.2≤| _ftotal / _ftotal |≤1.0, wherein, f _{is always} the focal length of the optical imaging lens group, and f _is the focal length of the negative lens among the multiple lenses. It should be noted that, by limiting the absolute value of the ratio of the focal length of at least one lens to the total focal length, it not only balances the focal length distribution ratio of other lenses, but also plays an important role in correcting the aberration of the entire optical imaging lens group. Therefore, it has laid an important foundation for achieving good imaging quality.

Further optionally, in the embodiments provided by the present application, the multiple lenses include at least one negative lens and one positive lens, the focal length of the negative lens is negative, the focal length of the positive lens is positive, and the absolute value of the focal length of the multiple lenses is The smallest negative lens and a positive lens satisfy the following relationship: the range of f _negative /f _total +f _positive /f _total is between (-0.5, 0.5), and the preferred range is between (-0.25, 0.25), wherein, f _negative is the focal length of the negative lens with the smallest absolute value of the focal length among the multiple lenses, f _{is positive} the focal length of the positive lens with the smallest absolute value of the focal length among the multiple lenses, and f is _always the focal length of the optical imaging lens group. It should be noted that, defined by the proportional relationship between the above-mentioned positive lens, negative lens and the total focal length, the multiple lenses of the optical imaging lens group can be quantified and controllable. The mirror group achieves the best imaging quality in the process of imaging the curved surface image into a flat image.

In addition, if the region where the focal length of the lens is located is not defined in this embodiment, it means that the focal length of the lens may be the focal length of the lens at the near optical axis. It should be emphasized that before the applicant made the present invention, the existing optical imaging lens group for projection display could not achieve the balance between imaging quality and large field of view, that is, it usually reduces imaging when the field of view is increased. In order to ensure the image quality, it is impossible to achieve a larger field of view. However, the inventive solution of the present application achieves high-quality imaging output while improving the viewing angle and miniaturization through the combination control of multiple lens focal lengths and surface structures.

Further optionally, in the embodiments provided in the present application, the Abbe number (dispersion coefficient) of at least one negative lens is in the range of 16-33. It should be noted that by limiting the range of the Abbe number of the negative lens, the distribution of the dispersion coefficients of different lenses is evenly controlled, so that the imaging quality of the entire optical imaging lens group can be stably controlled. In addition, the reason why the negative lens is limited is because the negative lens has a greater impact on its imaging quality than the positive lens, and the reason why the Abbe number of the negative lens is limited to 16-33 is because the Abbe number If it is too small, the dispersion will be more obvious, and the imaging quality of the lens will be worse. If the Abbe number is too large, it will affect the balanced distribution of Abbe numbers of other lenses.

Further optionally, in the embodiments provided by the present application, the refractive index of the negative lens with the smallest Abbe number among the multiple lenses satisfies the following relationship: if the negative lens with the smallest Abbe number is a plastic lens, the corresponding refractive index range is 1.5- Between 1.7; if the negative lens with the smallest Abbe number is a glass lens, the corresponding refractive index range is between 1.7-1.9. It should be noted that, by restricting the refractive index of the negative lens with the smallest Abbe number under different material states, the negative lens with the smallest Abbe number, which has a great influence on the image quality of the optical imaging mirror group, can be in the optimal refractive index. range, thereby reducing the sensitivity of the entire optical imaging lens group to the influence of different lens refractive indices by controlling the refractive index of the negative lens.

Further, in a possible implementation manner, the connection between multiple lenses can be connected by intervals, that is, there is a distance between the adjacent lens surfaces of two adjacent lenses and no material is filled, or it can be Adhesive bonding is used, that is, the adjacent lens surfaces of two adjacent lenses are separated by a certain distance and filled with adhesive materials. limit.

Further optionally, in a possible implementation manner, the aberrations generated between the lenses can be further effectively corrected, the optical sensitivity can be reduced, and the final imaging quality and field of view. In addition, it should be noted that the first side surface mentioned herein is a convex surface, which means that the first side surface forms a convex shape toward the first side of the optical imaging lens group; the first side surface is concave, which means that the first side surface is concave. One 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 concave surface means that the second side surface forms a concave shape toward the second side of the optical imaging lens group. It should be emphasized that in the embodiment of the present invention, it is not limited to limit the surface structure of all lenses at the same time, but also only limit the surface structure of at least one or two of them, as mentioned above, only limit the surface structure of the closest The surface structure of the first side surface and the second side surface of one or two lenses of the curved image may not be limited to the surface structure of other lenses.

Further, in some embodiments, the surface shape of the lens is not that the entire side surface is concave or convex, and the surface shape of the lens may be a compound curved surface, or the near optical axis part is curved and the edge part is non-curved; especially Optionally, 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 near optical axis of the lens surface; similarly, when the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface Can be located near the optical axis of the lens surface.

Further optionally, in a possible implementation manner, the first side surfaces and the second side surfaces of the plurality of lenses are aspherical surface structures or/and spherical surface structure. It should be noted that, preferably, an aspheric surface structure is selected, and by limiting the design of the mirror structure of the lens to an aspheric surface structure, more control variables can be obtained to reduce aberrations and reduce the number of lenses reasonably. , so on the basis of improving the image display quality, it also contributes to the miniaturization or miniaturization of the optical imaging lens group. In addition, the first side surface and the second side surface of the above-mentioned lens are aspherical surface structures, which can be understood as the whole or part of the optical effective area of the lens surface is aspherical.

Further optionally, in a possible implementation manner, the multiple lenses are made of plastic (ie, plastic) or/and glass. It should be noted that the lens made of plastic can effectively reduce the production cost. Compared with the glass material, the cost of the lens made of plastic material is one-twentieth to one-tenth of the cost of glass material, so it is very beneficial for low cost. Mass production at low cost; in addition, plastic lenses can usually be molded by injection molding, which is less difficult to process and can be easily processed into various surface structures that meet aspherical surfaces. At the same time, plastic materials can also reduce the weight of the lens as a whole. Conducive to its lightweight product design. When using glass material, the refractive index of glass material is higher and wider, which has advantages in correcting lens aberration; the expansion coefficient of glass material is much smaller, which is conducive to precision assembly. The characteristics of acid and alkali resistance make the service life and performance stability of the mirror group have strong advantages. Of course, it should be emphasized that in other embodiments of the present invention, it is not limited to the two materials of plastic and glass provided in the embodiments of the present invention, and can also be other materials capable of making lenses.

In addition, it should also be noted that the optical imaging lens group disclosed in the embodiments of the present invention can optionally be provided with at least one diaphragm, which can be located on the first side, between the lenses, or on the second side at the end. The type can be such as aperture diaphragm or field diaphragm, which can be used to reduce stray light and help to improve image display quality; optionally, at least one flat glass can be set on the second side to protect curved surface scanning optical fiber.

Embodiment one

FIG. 3 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged in sequence from the first side (that is, the side where the diaphragm 01 is located in FIG. 3 ) to the second side (that is, the side where the scanning curved surface 02 is located in FIG. 3 ). A first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 and a fifth lens 15 .

In this embodiment, there is an interval between every two adjacent lenses in the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 and the fifth lens 15, and the first lens 11, the second lens 12. The third lens 13, the fourth lens 14 and the fifth lens 15 are five single non-cemented lenses, that is, there is an interval between every two adjacent lenses and no bonding material is arranged in the space.

The focal lengths of the first lens 11 to the fifth lens 15 from the first side to the second side are positive, negative, positive, negative and positive in sequence.

The first side surface of the first lens 11 is convex, and the second side surface is concave.

The first side surface of the second lens 12 is convex, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens 13 are convex.

The first side surface of the fourth lens 14 is concave, and the second side surface is convex.

The first side surface of the fifth lens 15 is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens 11 to the fifth lens 15 in the optical imaging lens group satisfy the following relationship:

f _1/ f is 23.99, f ₂ /f is -0.70, f ₃ /f is 0.39, f ₄ /f is -1.29 and f ₅ /f is 1.62; wherein, f ₁ is the focal length of the first lens 11, f ₂ is the focal length of the second lens 12, _f3 is the focal length of the third lens 13, _f4 is the focal length of the fourth lens 14, _f5 is the focal length of the fifth lens 15, and f is the total focal length of the optical imaging lens group. The second lens 12 is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the third lens, and f ₂ /f+f ₃ /f is -0.31, which is between (-0.5, 0.5) .

The refractive index and dispersion coefficient of the first lens 11 to the fifth lens 15 in the optical imaging lens group respectively satisfy the following conditions:

n1 is 1.63, n2 is 1.73, n3 is 1.5, n4 is 1.62, and n5 is 1.62. Wherein, n1～n5 respectively represent the refractive indices of the first lens 11 to the fifth lens 15; the Abbe number of the first lens is 49, the Abbe number of the second lens is 30.3, and the Abbe number of the third lens is 69.4, The Abbe number of the fourth lens was 36.7, and the Abbe number of the fifth lens was 60.3. The negative lens with the smallest Abbe number is the second lens, which is a glass lens, and the corresponding refractive index range is between 1.7-1.9.

In the optical imaging mirror group provided by Embodiment 1 of the present invention; the total focal length of the optical imaging mirror group as a whole is 2.60 mm, the concave surface curvature radius of the fifth lens and the scanning curved surface 02 is 0.52 mm, the aperture value is 1.30, and the half angle of view It is 10 degrees, the scanning radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 02 are shown in Table 1:

The structural parameters of the optical imaging lens group in the first embodiment of Table 1

It should be noted that Table 1 is the detailed structural data of the optical imaging lens group of Embodiment 1, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-12 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 11 to the fifth lens 15 are shown in Table 2 below:

The aspheric conic coefficient data of different lens surfaces in the embodiment one of table 2

surface	K	A4	A6	A8
2	-6.31E+00	7.09E-02	-1.54E-02	5.68E-03
3	-1.26E+01	5.87E-02	-4.92E-02	-1.42E-03
4	-3.90E+00	-1.55E-01	3.39E-02	-9.38E-02
5	-3.07E+00	3.11E-02	-5.02E-02	-2.07E-02
6	-3.42E+00	-8.08E-02	2.35E-01	-1.55E-01
7	-2.90E+00	-9.17E-02	1.97E-01	-6.64E-02
8	-2.41E+00	1.64E-01	-1.05E-01	7.73E-02
9	-1.60E+00	1.66E-01	-1.64E-01	7.59E-02
10	-1.11E+00	2.28E-02	-4.19E-02	5.57E-03
11	-2.76E+00	7.19E-01	-2.35E+00	1.55E+00

Table 2 shows the aspherical coefficient data in the first embodiment, wherein k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 4, the field curvature distortion curve is shown in Figure 5, and the vertical axis chromatic aberration curve The figure is shown in Figure 6; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 4-Fig. 6 that the imaging resolution of the optical imaging mirror group in the first embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment two

FIG. 7 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged in sequence from the first side (that is, the side where the diaphragm 03 is located in FIG. 7 ) to the second side (that is, the side where the scanning curved surface 04 is located in FIG. 7 ). The first lens 31 , the second lens 32 , the third lens 33 , the fourth lens 34 and the fifth lens 35 .

In this embodiment, there is an interval between every two adjacent lenses in the first lens 31, the second lens 32, the third lens 33, the fourth lens 34 and the fifth lens 35, and the first lens 31, the second lens 32. The third lens 33, the fourth lens 34 and the fifth lens 35 are five single non-cemented lenses.

The focal lengths of the first lens 31 to the fifth lens 35 from the first side to the second side are positive, negative, positive, negative, and positive in sequence.

The first side surface of the first lens 31 is convex, and the second side surface is concave.

The first side surface of the second lens 32 is convex at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens 33 are convex.

The first side surface of the fourth lens 34 is concave, and the second side surface is convex.

The first side surface of the fifth lens 35 is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens 31 to the fifth lens 35 in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 12.29, f ₂ /f is -1.07, f ₃ /f is 0.43, f ₄ /f is -0.92 and f ₅ /f is 0.84; wherein, f ₁ is the focal length of the first lens 31, f ₂ is the focal length of the second lens 32, _f3 is the focal length of the third lens 33, _f4 is the focal length of the fourth lens 34, _f5 is the focal length of the fifth lens 35, and f is the total focal length of the optical imaging lens group. The fourth lens 34 is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₄ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the fourth lens, and the positive lens with the smallest absolute value of the focal length ratio is the third lens, and f ₄ /f+f ₃ /f is -0.49, which is between (-0.5, 0.5) .

The refractive index and dispersion coefficient of the first lens 31 to the fifth lens 35 in the optical imaging lens group respectively satisfy the following conditions:

n1 is 1.57, n2 is 1.76, n3 is 1.49, n4 is 1.76, and n5 is 1.63. Wherein, n1～n5 respectively represent the refractive index of the first lens 31 to the fifth lens 35; the Abbe number of the first lens is 62.4, the Abbe number of the second lens is 27.6, and the Abbe number of the third lens is 70.4, The Abbe number of the fourth lens was 27.6, and the Abbe number of the fifth lens was 58. The negative lens with the smallest Abbe number is the second lens and the fourth lens (the Abbe numbers are equal), which are glass lenses, and the corresponding refractive index range is between 1.7-1.9.

In the optical imaging lens group provided in Embodiment 2 of the present invention, the total focal length of the optical imaging lens group as a whole is 2.6mm, the curvature radius of the concave surface of the fifth lens opposite to the scanning curved surface 04 is 0.61mm, the aperture value is 1.30, and the half field angle It is 10 degrees, the scanning radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 04 are shown in Table 3:

The structural parameters of the optical imaging lens group in the second embodiment of Table 3

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 03	the	unlimited	1	the	the
2	first lens 31	Aspherical	2.32	0.82	1.57	62.4
3	the	Aspherical	2.32	0.95	the	the
4	second lens 32	Aspherical	1.43	0.95	1.76	27.6
5	the	Aspherical	0.60	0.13	the	the
6	third lens 33	Aspherical	0.70	1.19	1.49	70.4
7	the	Aspherical	-1.08	0.23	the	the
8	Fourth lens 34	Aspherical	-0.47	0.75	1.76	27.6
9	the	Aspherical	-1.07	0.10	the	the
10	fifth lens 35	Aspherical	0.63	0.77	1.63	58
11	the	Aspherical	0.61	0.50	the	the
12	Scan Surface 04	sphere	2	the	the	the

It should be noted that Table 3 is the detailed structural data of the optical imaging lens group of Embodiment 2, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-12 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 31 to the fifth lens 35 are shown in Table 4 below:

The aspheric conic coefficient data of different lens surfaces in the second embodiment of table 4

surface	K	A4	A6	A8
2	-8.34E+00	6.48E-02	-1.98E-02	3.65E-03
3	-1.86E+01	4.24E-02	-5.36E-02	1.32E-02
4	-3.42E+00	-1.38E-01	5.75E-02	-1.09E-01
5	-4.24E+00	-5.25E-02	-1.22E-01	3.53E-02
6	-5.23E+00	-1.58E-01	2.42E-01	-1.46E-01
7	-6.61E+00	-1.61E-02	1.80E-01	-1.38E-01
8	-3.54E+00	1.65E-01	-8.96E-02	2.04E-02
9	-1.55E+00	1.73E-01	-1.57E-01	8.81E-02

10	-1.44E+00	-5.11E-02	1.61E-01	-3.23E-01
11	-5.66E+00	8.10E-01	-3.49E+00	2.95E+00

Table 4 shows the aspheric coefficient data in the second embodiment, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 8, the field curvature distortion curve is shown in Figure 9, and the vertical axis chromatic aberration curve The figure is shown in Figure 10; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 8-Fig. 10 that the imaging resolution of the optical imaging mirror group in the second embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment Three

FIG. 11 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged in sequence from the first side (that is, the side where the diaphragm 05 is located in FIG. 11 ) to the second side (that is, the side where the scanning curved surface 06 is located in FIG. 11 ). The first lens 51 , the second lens 52 , the third lens 53 , the fourth lens 54 and the fifth lens 55 .

In this embodiment, every two adjacent lenses in the first lens 51, the second lens 52, the third lens 53, the fourth lens 54, and the fifth lens 55 have intervals, and the first lens 51, the second lens 52, the third lens 53, the fourth lens 54 and the fifth lens 55 are five single non-cemented lenses.

The focal lengths of the first lens 51 to the fifth lens 55 from the first side to the second side are positive, negative, positive, negative and positive in sequence.

Both the first side surface and the second side surface of the first lens 51 are convex.

The first side surface of the second lens 52 is convex at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens 53 are convex.

The first side surface of the fourth lens 54 is concave, and the second side surface is convex.

The first side surface of the fifth lens 55 is convex, the second side surface is concave at the near optical axis, and the second side surface is convex at the far optical axis.

In this embodiment, the focal lengths of the first lens 51 to the fifth lens 55 in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 6.22, f ₂ /f is -1.04, f ₃ /f is 0.49, f ₄ /f is -0.50 and f ₅ /f is 0.50; wherein, f ₁ is the focal length of the first lens 51, f ₂ is the focal length of the second lens 52, _f3 is the focal length of the third lens 53, _f4 is the focal length of the fourth lens 54, _f5 is the focal length of the fifth lens 55, and f is the total focal length of the optical imaging lens group. The fourth lens 54 is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₄ /f|≤1.0. The negative lens with the smallest absolute value of focal length ratio is the fourth lens, the positive lens with the smallest absolute value of focal length ratio is the third lens, and f ₄ /f+f ₃ /f is -0.01, which is between (-0.5, 0.5) .

The refractive index and dispersion coefficient of the first lens 51 to the fifth lens 55 in the optical imaging lens group respectively satisfy the following conditions:

n1 is 1.61, n2 is 1.75, n3 is 1.49, n4 is 1.76, and n5 is 1.62. Wherein, n1～n5 respectively represent the refractive indices of the first lens 51 to the fifth lens 55; the Abbe number of the first lens is 41.7, the Abbe number of the second lens is 36, and the Abbe number of the third lens is 70.4, The Abbe number of the fourth lens was 27.6, and the Abbe number of the fifth lens was 60.3. The negative lens with the smallest Abbe number is the fourth lens, which is a glass lens, and the corresponding refractive index range is between 1.7-1.9.

In the optical imaging lens group provided in Embodiment 3 of the present invention, the overall focal length of the optical imaging lens group is 2.6 mm, the radius of curvature of the concave surface of the fifth lens opposite to the scanning curved surface 06 is 3.09 mm, the aperture value is 1.30, and the half angle of view is It is 10 degrees, the scanning radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 06 are shown in Table 5:

The structural parameters of the optical imaging lens group in the third embodiment of Table 5

It should be noted that Table 5 is the detailed structural data of the optical imaging lens group of Embodiment 3, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-12 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 51 to the fifth lens 55 are shown in Table 6 below:

The aspheric conic coefficient data of different lens surfaces in the third embodiment of table 6

surface	K	A4	A6		A8
2	4.00E+02	7.12E-02	-2.24E-02	5.06E-03
3	2.04E+01	5.23E-02	-4.36E-02	5.73E-03
4	-2.37E+00	-1.05E-01	3.87E-02	-9.85E-02
5	-4.20E+00	-7.52E-02	-1.12E-01	4.58E-02
6	-4.34E+00	-2.01E-01	2.38E-01	-1.05E-01
7	-5.49E+00	-5.81E-02	1.52E-01	-1.17E-01
8	-3.39E+00	2.07E-01	-9.29E-02	7.88E-03
9	-1.18E+00	1.73E-01	-1.03E-01	5.87E-02
10	-1.50E+00	-2.44E-01	1.97E-01	-2.78E-01
11	-2.61E+01	-6.17E-01	4.00E-01	-9.63E-02

Table 6 shows the aspheric coefficient data in Example 3, wherein k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 12, the field curvature distortion curve is shown in Figure 13, and the vertical axis chromatic aberration curve The figure is shown in Figure 14; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 12-Fig. 14 that the imaging resolution of the optical imaging mirror group in the third embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment four

FIG. 15 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged in sequence from the first side (that is, the side where the diaphragm 07 is located in FIG. 15 ) to the second side (that is, the side where the scanning curved surface 08 is located in FIG. 15 ). A first lens 71 , a second lens 72 , a third lens 73 , a fourth lens 74 , a fifth lens 75 and a sixth lens 76 .

In this embodiment, there is an interval between every two adjacent lenses among the first lens 71, the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75 and the sixth lens 76, and the first lens 71, the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75 and the sixth lens 76 are six single non-cemented lenses.

The focal lengths of the first lens 71 to the sixth lens 76 from the first side to the second side are positive, positive, negative, positive, negative and positive in sequence.

The first side surface of the first lens 71 is concave, and the second side surface is convex.

The first side surface of the second lens 72 is convex, and the second side surface is concave at the near optical axis.

The first side surface of the third lens 73 is convex, and the second side surface is concave at the near optical axis.

Both the first side surface and the second side surface of the fourth lens 74 are convex.

The first side surface of the fifth lens 75 is concave, and the second side surface is convex.

The first side surface of the sixth lens 76 is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens 71 to the sixth lens 76 in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 3.81, f ₂ /f is 5.19, f ₃ /f is -0.42, f ₄ /f is 0.39, f ₅ /f is -1.35 and f ₆ /f is 5.18; among them, f ₁ is the first The focal length of the first lens 71, _f2 is the focal length of the second lens 72, _f3 is the focal length of the third lens 73, _f4 is the focal length of the fourth lens 74, _f5 is the focal length of the fifth lens 75, _f6 is the focal length of the first lens The focal length of the six lenses 76, f is the total focal length of the optical imaging lens group. The third lens 73 is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₃ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the third lens, and the positive lens with the smallest absolute value of the focal length ratio is the fourth lens, and f ₃ /f+f ₄ /f is -0.03, which is between (-0.5, 0.5) .

The refractive index and dispersion coefficient of the first lens 71 to the sixth lens 76 in the optical imaging lens group respectively meet the following conditions:

n1 is 1.69, n2 is 1.56, n3 is 1.69, n4 is 1.58, n5 is 1.69, and n6 is 1.69. Wherein, n1～n6 represent the refractive indices of the first lens 71 to the sixth lens 76 respectively; the Abbe number of the first lens is 42.3, the Abbe number of the second lens is 64.1, and the Abbe number of the third lens is 30.8, The Abbe number of the fourth lens is 62.8, the Abbe number of the fifth lens is 30.8, and the Abbe number of the sixth lens is 49.4. The negative lens with the smallest Abbe number is the third lens and the fifth lens (with the same Abbe number), which are plastic lenses, and the corresponding refractive index range is between 1.5-1.7.

In the optical imaging lens group provided in Embodiment 4 of the present invention, the overall focal length of the optical imaging lens group is 2.6 mm, the curvature radius of the concave surface of the sixth lens opposite to the scanning curved surface 08 is 0.72 mm, the aperture value is 1.30, and the half angle of view is It is 10 degrees, the scanning radius is 2 mm, and the entrance pupil diameter is 2 mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 08 are shown in Table 7:

The structural parameters of the optical imaging lens group in the fourth embodiment of Table 7

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 07	the	unlimited	1	the	the
2	first lens 71	sphere	-3.47	0.86	1.69	42.3
3	the	sphere	-2.55	0.10	the	the
4	second lens 72	Aspherical	8.89	1.61	1.56	64.1
5	the	Aspherical	-48.46	0.10	the	the
6	third lens 73	Aspherical	3.80	1.83	1.69	30.8
7	the	Aspherical	0.51	0.20	the	the
8	Fourth lens 74	Aspherical	0.75	1.44	1.58	62.8
9	the	Aspherical	-0.77	0.12	the	the
10	fifth lens 75	Aspherical	-0.58	0.60	1.69	30.8
11	the	Aspherical	-1.09	0.10	the	the
12	sixth lens 76	Aspherical	0.96	0.78	1.69	49.4
13	the	Aspherical	0.72	0.50	the	the
14	Scan Surface 08	sphere	2	the	the	the

It should be noted that Table 7 is the detailed structural data of the optical imaging lens group of Embodiment 4, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-14 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 71 to the sixth lens 76 are shown in Table 8 below:

The aspheric conic coefficient data of different lens surfaces in the fourth embodiment of table 8

surface

K

A4

A6

A8

4	-3.24E+01	2.25E-02	-1.14E-02	6.31E-04
5	4.00E+02	7.36E-02	-7.90E-03	-2.66E-03
6	-4.14E+00	-5.91E-02	3.73E-02	-1.68E-02
7	-3.09E+00	9.41E-03	-1.59E-03	-3.23E-02
8	-3.70E+00	-1.67E-01	2.43E-01	-1.12E-01
9	-3.73E+00	-4.64E-02	1.29E-01	-5.55E-02
10	-3.60E+00	2.21E-01	-9.29E-03	-3.66E-02
11	-1.42E+00	2.47E-01	-6.00E-02	5.48E-03
12	-1.54E+00	-2.69E-01	3.66E-01	-2.01E-01
13	-4.37E+00	-3.39E-01	-5.98E-02	9.09E-02

Table 8 shows the aspheric coefficient data in Embodiment 4, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 16, the field curvature distortion curve is shown in Figure 17, and the vertical axis chromatic aberration curve The figure is shown in Figure 18; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 16-Fig. 18 that the imaging resolution of the optical imaging mirror group in the fourth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment five

FIG. 19 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged in sequence from the first side (that is, the side where the diaphragm 09 is located in FIG. 19 ) to the second side (that is, the side where the scanning curved surface 10 is located in FIG. 19 ). A first lens 91 , a second lens 92 , a third lens 93 , a fourth lens 94 and a fifth lens 95 .

In this embodiment, there is an interval between every two adjacent lenses among the first lens 91, the second lens 92, the third lens 93, the fourth lens 94 and the fifth lens 95, and the first lens 91, the second lens 92, the third lens 93, the fourth lens 94 and the fifth lens 95 are five single non-cemented lenses.

The focal lengths of the first lens 91 to the fifth lens 95 from the first side to the second side are positive, negative, positive, negative and positive in sequence.

The first side surface of the first lens 91 is convex, and the second side surface is concave at the near optical axis.

The first side surface of the second lens 92 is convex at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens 93 are convex.

The first side surface of the fourth lens 94 is concave, and the second side surface is convex.

The first side surface of the fifth lens 95 is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens 91 to the fifth lens 95 in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 7.75, f ₂ /f is -1.38, f ₃ /f is 0.52, f ₄ /f is -0.70 and f ₅ /f is 0.60; wherein, f ₁ is the focal length of the first lens 91, f ₂ is the focal length of the second lens 92, _f3 is the focal length of the third lens 93, _f4 is the focal length of the fourth lens 94, _f5 is the focal length of the fifth lens 95, and f is the total focal length of the optical imaging lens group. The fourth lens 94 is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₄ /f|≤1.0. The negative lens with the smallest absolute value of focal length ratio is the fourth lens, the positive lens with the smallest absolute value of focal length ratio is the third lens, f ₄ /f+f ₃ /f is -0.18, between (-0.5, 0.5) .

The refractive index and dispersion coefficient of the first lens 91 to the fifth lens 95 in the optical imaging lens group respectively satisfy the following conditions:

n1 is 1.55, n2 is 1.76, n3 is 1.49, n4 is 1.76, and n5 is 1.65. Wherein, n1～n5 respectively represent the refractive indices of the first lens 91 to the fifth lens 95; the Abbe number of the first lens is 49.9, the Abbe number of the second lens is 27.6, and the Abbe number of the third lens is 70.4, The Abbe number of the fourth lens was 27.6, and the Abbe number of the fifth lens was 55.8. The negative lens with the smallest Abbe number is the second lens and the fourth lens, which are glass lenses, and the corresponding refractive index range is between 1.7-1.9.

In the optical imaging mirror group provided by the embodiment of the present invention, the overall focal length of the optical imaging mirror group is 2.6mm, the curvature radius of the concave surface of the fifth lens opposite to the scanning curved surface 10 is 0.87mm, the aperture value is 1.30, and the half field angle is 10 degrees, scan radius 2mm, entrance pupil diameter 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 10 are as shown in Table 9:

The structural parameters of the optical imaging lens group in the fifth embodiment of Table 9

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 09	the	unlimited	1	the	the
2	first lens 91	Aspherical	4.49	0.84	1.55	49.9
3	the	Aspherical	6.97	1.05	the	the
4	second lens 92	Aspherical	1.44	0.89	1.76	27.6
5	the	Aspherical	0.69	0.17	the	the
6	third lens 93	Aspherical	0.85	1.12	1.49	70.4
7	the	Aspherical	-1.74	0.16	the	the
8	fourth lens 94	Aspherical	-0.65	1.01	1.76	27.6
9	the	Aspherical	-2.05	0.10	the	the
10	fifth lens 95	Aspherical	0.70	1.06	1.65	55.8
11	the	Aspherical	0.87	0.50	the	the
12	Scan Surface 10	sphere	2	the	the	the

It should be noted that Table 9 is the detailed structural data of the optical imaging lens group of Embodiment 5, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surface 0-12 represents the order from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 91 to the fifth lens 95 are shown in Table 10 below:

The aspheric conic coefficient data of different lens surfaces in the fifth embodiment of table 10

surface	K	A4	A6	A8
2	-5.33E+01	3.63E-02	-3.23E-02	4.09E-03
3	-3.27E+02	-5.07E-02	-1.97E-02	5.75E-03
4	-4.40E+00	-1.10E-01	2.55E-02	-9.77E-02
5	-4.99E+00	-4.32E-02	-8.18E-02	2.34E-02
6	-6.91E+00	-2.32E-01	2.83E-01	-1.17E-01
7	-1.17E+01	-3.64E-02	1.27E-01	-9.09E-02
8	-5.13E+00	2.41E-01	-4.87E-02	-3.45E-02
9	2.52E-01	1.37E-01	-1.16E-02	3.05E-02
10	-1.15E+00	-1.40E-01	1.85E-01	-1.51E-01
11	-6.66E+00	3.32E-01	-1.63E+00	1.27E+00

Table 10 shows the aspheric coefficient data in Embodiment 5, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 20, the field curvature distortion curve is shown in Figure 21, and the vertical axis chromatic aberration curve The figure is shown in Figure 22; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 20-Fig. 22 that the imaging resolution of the optical imaging mirror group in the fifth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment six

FIG. 23 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged in sequence from the first side (that is, the side where the diaphragm 21 is located in FIG. 23 ) to the second side (that is, the side where the scanning curved surface 22 is located in FIG. 23 ). A first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and the first lens, the second lens, the third lens, the The four lenses and the fifth lens are five single non-cemented lenses.

The focal lengths of the first lens to the fifth lens from the first side to the second side are positive, negative, positive, positive and positive in sequence.

The first side surface of the first lens is convex, and the second side surface is concave.

Both the first side surface and the second side surface of the second lens are concave.

The first side surface of the third lens is convex, and the second side surface is concave.

The first side surface of the fourth lens is convex, and the second side surface is convex at the near optical axis.

The first side surface of the fifth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fifth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 2.49, f ₂ /f is -0.65, f ₃ /f is 1.45, f ₄ /f is 0.91 and f ₅ /f is 10.53; where f ₁ is the focal length of the first lens, f ₂ is The focal length of the second lens, _f3 is the focal length of the third lens, _f4 is the focal length of the fourth lens, _f5 is the focal length of the fifth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the fourth lens, and f ₂ /f+f ₄ /f is 0.26, which is between (-0.5, 0.5).

The refractive index and dispersion coefficient of the first lens to the fifth lens in the optical imaging lens group respectively meet the following conditions:

n1 is 1.59, n2 is 1.76, n3 is 1.62, n4 is 1.54, and n5 is 1.62. Among them, n1~n5 represent the refractive indices of the first lens to the fifth lens respectively; the Abbe number of the first lens is 61.4, the Abbe number of the second lens is 27.6, the Abbe number of the third lens is 60.3, and the Abbe number of the fourth lens is The Abbe number of the lens was 65.1, and the Abbe number of the fifth lens was 60.3. The negative lens with the smallest Abbe number is the second lens, which is a glass lens, and the corresponding refractive index range is between 1.7-1.9.

In the optical imaging lens group provided in Embodiment 6 of the present invention, the total focal length of the optical imaging lens group as a whole is 2.6 mm, the concave surface curvature radius of the fifth lens opposite to the scanning curved surface 22 is 0.44 mm, the aperture value is 1.30, and the half field angle It is 10 degrees, the scanning radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 22 are shown in Table 11:

The structural parameters of the optical imaging lens group in the sixth embodiment of Table 11

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 21	the	unlimited	1	the	the
2	first lens	Aspherical	3.86	1.84	1.59	61.4
3	the	Aspherical	3535.94	1.43	the	the
4	second lens	Aspherical	-5.95	1.09	1.76	27.6
5	the	Aspherical	1.80	0.10	the	the
6	third lens	Aspherical	1.91	0.93	1.62	60.3
7	the	Aspherical	8.27	0.10	the	the
8	fourth lens	Aspherical	4.02	1.12	1.54	65.1
9	the	Aspherical	-1.72	0.10	the	the
10	fifth lens	Aspherical	0.70	0.73	1.62	60.3
11	the	Aspherical	0.44	0.5	the	the
12	Scan Surface 22	sphere	2	the	the	the

It should be noted that Table 11 is the detailed structural data of the optical imaging lens group of Embodiment 6, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-12 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fifth lens are shown in Table 12 below:

The aspheric conic coefficient data of different lens surfaces in the sixth embodiment of table 12

surface	K	A4	A6	A8
2	-1.82E+01	4.71E-02	-1.18E-02	3.78E-03
3	4.00E+02	3.38E-02	1.00E-02	1.25E-02
4	-1.89E+02	-1.31E-01	1.20E-01	-4.27E-02
5	-4.77E+00	-7.97E-02	6.13E-02	-3.43E-02
6	-3.01E+00	-8.28E-02	4.12E-02	-1.80E-02
7	3.56E+01	-1.19E-01	1.61E-02	2.42E-03
8	6.77E-01	5.28E-02	4.61E-04	2.26E-03
9	-1.32E+00	5.80E-02	1.21E-01	-4.34E-02
10	-4.37E-01	-4.33E-02	-1.86E-02	-1.18E-01
11	-9.69E-01	6.42E-01	-2.14E+00	1.16E+00

Table 12 shows the aspheric coefficient data in Embodiment 6, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 24, the field curvature distortion curve is shown in Figure 25, and the vertical axis chromatic aberration curve The figure is shown in Figure 26; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 24-Fig. 26 that the imaging resolution of the optical imaging mirror group in the sixth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment seven

FIG. 27 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging mirror group includes a common optical axis arranged sequentially from the first side (that is, the side where the diaphragm 23 is located in FIG. 27 ) to the second side (that is, the side where the scanning curved surface 24 is located in FIG. 27 ). A first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and the first lens, the second lens, the third lens, the The four lenses and the fifth lens are five single non-cemented lenses.

The focal lengths of the first lens to the fifth lens from the first side to the second side are negative, positive, negative, positive and negative in sequence.

The first side surface of the first lens is convex, and the second side surface is concave.

The first side surface of the second lens is convex, and the second side surface is concave.

The first side surface of the third lens is convex, and the second side surface is concave.

The first side surface of the fourth lens is concave, and the second side surface is convex.

The first side surface of the fifth lens is convex, the second side surface is concave at the near optical axis, and the second side surface is convex at the far optical axis.

In this embodiment, the focal lengths of the first lens to the fifth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is -1.54, f ₂ /f is 0.68, f ₃ /f is -0.54, f ₄ /f is 0.57 and f ₅ /f is -3.50; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, f ₅ is the focal length of the fifth lens, and f is the total focal length of the optical imaging lens group. The third lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₃ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the third lens, and the positive lens with the smallest absolute value of the focal length ratio is the fourth lens, and f ₃ /f+f ₄ /f is 0.03, which is between (-0.5, 0.5).

The refractive index and dispersion coefficient of the first lens to the fifth lens in the optical imaging lens group respectively meet the following conditions:

n1 is 1.73, n2 is 1.58, n3 is 1.76, n4 is 1.49, and n5 is 1.62. Among them, n1~n5 represent the refractive indices of the first lens to the fifth lens respectively; the Abbe number of the first lens is 46.3, the Abbe number of the second lens is 61.3, the Abbe number of the third lens is 27.6, and the Abbe number of the fourth lens is The Abbe number of the lens was 70.4, and the Abbe number of the fifth lens was 60.3. The negative lens with the smallest Abbe number is the third lens, which is a glass lens, and the corresponding refractive index range is between 1.7-1.9.

In the optical imaging mirror group provided by the embodiment of the present invention, the overall focal length of the optical imaging mirror group is 2.6mm, the curvature radius of the concave surface of the fifth lens opposite to the scanning curved surface 24 is 0.7mm, the aperture value is 1.30, and the half angle of view is 10 degrees, scanning radius 1.8mm, entrance pupil diameter 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 24 are shown in Table 13:

The structural parameters of the optical imaging lens group in the seventh embodiment of Table 13

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 23	the	unlimited	1	the	the
2	first lens	Aspherical	11.23	1.94	1.73	46.3
3	the	Aspherical	2.15	0.37	the	the
4	second lens	Aspherical	0.97	1.31	1.58	61.3
5	the	Aspherical	7.65	0.34	the	the
6	third lens	Aspherical	4.78	0.63	1.76	27.6
7	the	Aspherical	0.83	0.34	the	the
8	fourth lens	Aspherical	34.38	1.11	1.49	70.4
9	the	Aspherical	-0.74	0.10	the	the
10	fifth lens	Aspherical	1.14	0.77	1.62	60.3
11	the	Aspherical	0.70	0.50	the	the
12	Scan Surface 24	sphere	2	the	the	the

It should be noted that Table 13 is the detailed structural data of the optical imaging lens group of Embodiment 7, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-12 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fifth lens are shown in Table 14 below:

The aspheric conic coefficient data of different lens surfaces in the seventh embodiment of table 14

surface	K	A4	A6		A8
2	5.68E+01	-7.44E-03	9.83E-03	-4.02E-03
3	-1.61E+01	-6.07E-02	4.00E-02	-7.74E-03
4	-2.35E+00	2.42E-02	5.98E-03	-1.45E-02
5	-3.47E+02	2.42E-01	-3.25E-01	1.39E-01
6	-1.43E+02	-1.59E-01	7.35E-03	7.24E-02
7	-5.24E+00	-2.98E-01	2.20E-01	-7.42E-02
8	4.00E+02	-3.52E-01	3.24E-01	-1.42E-01
9	-2.13E+00	-1.25E-01	1.00E-01	-1.97E-02
10	-6.35E-01	-5.57E-02	1.76E-02	-2.62E-01
11	-6.65E-01	-1.95E+00	1.81E+00	-8.87E-01

Table 14 shows the aspheric coefficient data in Example 7, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 28, the field curvature distortion curve is shown in Figure 29, and the vertical axis chromatic aberration curve The figure is shown in Figure 30; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 28-Fig. 30 that the imaging resolution of the optical imaging mirror group in the seventh embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment Eight

FIG. 31 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged in sequence from the first side (that is, the side where the diaphragm 25 is located in FIG. 31 ) to the second side (that is, the side where the scanning curved surface 26 is located in FIG. 31 ). The first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, and the first lens, the second lens, the third lens, and the fifth lens The four lenses and the fifth lens are five single non-cemented lenses.

The focal lengths of the first lens to the fifth lens from the first side to the second side are positive, negative, positive, positive and negative in sequence.

Both the first side surface and the second side surface of the first lens are convex.

The first side surface of the second lens is concave at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens are convex.

The first side surface of the fourth lens is convex at the near optical axis, and the second side surface is convex.

The first side surface of the fifth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fifth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 3.00, f ₂ /f is -0.46, f ₃ /f is 0.54, f ₄ /f is 32.84 and f ₅ /f is -1.48; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, _f3 is the focal length of the third lens, _f4 is the focal length of the fourth lens, _f5 is the focal length of the fifth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the third lens, and f ₂ /f+f ₃ /f is 0.08, which is between (-0.5, 0.5).

The refractive index and dispersion coefficient of the first lens to the fifth lens in the optical imaging lens group respectively meet the following conditions:

n1 is 1.632, n2 is 1.632, n3 is 1.535, n4 is 1.535, and n5 is 1.632. Among them, n1~n5 represent the refractive index of the first lens to the fifth lens respectively; the Abbe number of the first lens is 23.2, the Abbe number of the second lens is 23.2, the Abbe number of the third lens is 55.7, and the Abbe number of the fourth lens is The Abbe number of the lens was 55.7, and the Abbe number of the fifth lens was 23.2. The negative lens with the smallest Abbe number is the second lens and the fifth lens, which are plastic lenses, and the corresponding refractive index range is between 1.5-1.7.

In the optical imaging lens group provided by Embodiment 8 of the present invention; the overall focal length of the optical imaging lens group is 2.57mm, the concave surface curvature radius of the fifth lens and the scanning curved surface 26 is 0.76mm, the aperture value is 1.25, and the half angle of view It is 10 degrees, the scanning radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 26 are shown in Table 15:

The structural parameters of the optical imaging lens group in the eighth embodiment of Table 15

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the	the
1	Aperture 25	the	unlimited	1	the	the	the
2	first lens	Aspherical	46.23	0.91	plastic	1.632	23.2
3	the	Aspherical	-5.61	2.64	the	the	the
4	second lens	Aspherical	-1.10	0.91	plastic	1.632	23.2
5	the	Aspherical	3.57	0.11	the	the	the
6	third lens	Aspherical	1.37	1.85	plastic	1.535	55.7
7	the	Aspherical	-0.79	0.48	the	the	the
8	fourth lens	Aspherical	-0.86	1.38	plastic	1.535	55.7
9	the	Aspherical	-1.31	0.10	the	the	the
10	fifth lens	Aspherical	1.71	1.08	plastic	1.632	23.2
11	the	Aspherical	0.76	0.50	the	the	the
12	Scan Surface 26	sphere	2	the	the	the	the

It should be noted that Table 15 is the detailed structural data of the optical imaging lens group of Embodiment 8, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-12 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fifth lens are shown in Table 16 below:

The aspheric conic coefficient data of different lens surfaces in the eighth embodiment of table 16

surface	K	A4	A6	A8
2	-3.95E+02	2.98E-02	7.92E-03	-3.95E-03
3	-8.50E+00	4.07E-02	1.10E-02	-4.31E-03
4	-4.17E+00	1.05E-01	-1.18E-01	1.39E-02
5	-7.61E-01	4.02E-02	-6.15E-02	6.04E-03
6	-2.57E+00	-7.43E-02	3.48E-02	-1.22E-02
7	-2.59E+00	5.37E-04	3.80E-03	1.71E-03
8	-5.27E+00	8.41E-02	-4.78E-03	4.36E-04
9	-1.02E+00	8.41E-02	-2.10E-02	3.65E-03
10	-4.10E-02	6.93E-02	-4.67E-02	-8.02E-03
11	1.22E-01	1.01E+00	-4.71E+00	1.28E+00

Table 16 shows the aspheric coefficient data in the eighth embodiment, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 32, the field curvature distortion curve is shown in Figure 33, and the vertical axis chromatic aberration curve The figure is shown in Figure 34; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 32-Fig. 34 that the imaging resolution of the optical imaging mirror group in the eighth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment nine

FIG. 35 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging mirror group includes a common optical axis arranged in sequence from the first side (that is, the side where the diaphragm 27 is located in FIG. 35 ) to the second side (that is, the side where the scanning curved surface 28 is located in FIG. 35 ). A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and the first lens, the second lens, the second lens The third lens, the fourth lens, the fifth lens and the sixth lens are six single non-cemented lenses.

The focal lengths of the first lens to the sixth lens from the first side to the second side are positive, negative, negative, positive, negative and positive in sequence.

The first side surface of the first lens is concave, and the second side surface is convex.

Both the first side surface and the second side surface of the second lens are concave.

The first side surface of the third lens is convex, and the second side surface is concave at the near optical axis.

Both the first side surface and the second side surface of the fourth lens are convex.

The first side surface of the fifth lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the sixth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the sixth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 10.18, f ₂ /f is -4.11, f ₃ /f is -1.43, f ₄ /f is 0.42, f ₅ /f is -0.37 and f ₆ /f is 0.43; among them, f ₁ is The focal length of the first lens, _f2 is the focal length of the second lens, _f3 is the focal length of the third lens, _f4 is the focal length of the fourth lens, _f5 is the focal length of the fifth lens, and _f6 is the focal length of the sixth lens , f is the total focal length of the optical imaging lens group. The fifth lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₅ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the fifth lens, and the positive lens with the smallest absolute value of the focal length ratio is the fourth lens, and f ₅ /f+f ₄ /f is 0.05, which is between (-0.5, 0.5).

The refractive index and dispersion coefficient of the first lens to the sixth lens in the optical imaging lens group respectively meet the following conditions:

n1 is 1.52, n2 is 1.73, n3 is 1.71, n4 is 1.57, n5 is 1.69, and n6 is 1.62. Among them, n1~n6 represent the refractive indices of the first lens to the sixth lens respectively; the Abbe number of the first lens is 66.8, the Abbe number of the second lens is 29.2, the Abbe number of the third lens is 29.6, and the Abbe number of the fourth lens is The Abbe number of the lens is 63.5, the Abbe number of the fifth lens is 30.7, and the Abbe number of the sixth lens is 60.3. The negative lens with the smallest Abbe number is the second lens, and when it is a glass lens, the corresponding refractive index range is between 1.7-1.9.

In the optical imaging mirror group provided by Embodiment 9 of the present invention, the overall focal length of the optical imaging mirror group is 2.6 mm, the curvature radius of the concave surface of the sixth lens opposite to the scanning curved surface 28 is 5.15 mm, the aperture value is 1.30, and the half angle of view is is 10 degrees, the scanning radius is 2 mm, and the entrance pupil diameter is 2 mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 28 are as shown in Table 17:

The structural parameters of the optical imaging lens group in the ninth embodiment of Table 17

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 27	the	unlimited	1	the	the
2	first lens	sphere	-2.67	0.83	1.52	66.8
3	the	sphere	-2.48	0.10	the	the
4	second lens	Aspherical	-10.97	0.84	1.73	29.2
5	the	Aspherical	29.48	0.10	the	the
6	third lens	Aspherical	1.22	1.08	1.71	29.6
7	the	Aspherical	0.53	0.26	the	the
8	fourth lens	Aspherical	0.64	1.30	1.57	63.5
9	the	Aspherical	-4.05	0.45	the	the
10	fifth lens	Aspherical	-0.43	0.71	1.69	30.7
11	the	Aspherical	-2.10	0.18	the	the
12	sixth lens	Aspherical	0.66	1.15	1.62	60.3
13	the	Aspherical	5.15	0.50	the	the
14	Scan Surface 28	sphere	2	the	the	the

It should be noted that Table 17 is the detailed structural data of the optical imaging lens group of Embodiment 9, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-14 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the sixth lens are shown in Table 18 below:

The aspheric conic coefficient data of different lens surfaces in table 18 embodiment nine

surface	K	A4	A6	A8
4	-3.68E+02	3.49E-02	-1.91E-02	1.63E-03
5	2.68E+02	8.70E-02	-7.57E-02	1.49E-02
6	-2.90E+00	8.61E-02	-4.40E-02	-6.56E-04
7	-2.79E+00	1.91E-01	-2.22E-01	3.54E-02
8	-2.76E+00	1.12E-01	-9.52E-02	-5.06E-03
9	2.22E+00	8.46E-03	-1.64E-01	1.32E-01
10	-2.54E+00	-2.12E-01	2.64E-01	-1.14E-01
11	1.84E+00	7.12E-03	4.33E-02	5.10E-03
12	-2.36E+00	1.23E-01	-4.25E-02	-8.00E-02
13	-2.83E+01	1.17E-01	-6.06E-01	3.85E-01

Table 18 shows the aspheric coefficient data in Example 9, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 36, the field curvature distortion curve is shown in Figure 37, and the vertical axis chromatic aberration curve The figure is shown in Figure 38; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 36-Fig. 38 that the imaging resolution of the optical imaging mirror group in the ninth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment ten

FIG. 39 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged sequentially from the first side (that is, the side where the diaphragm 29 is located in FIG. 39 ) to the second side (that is, the side where the scanning curved surface 30 is located in FIG. 39 ). A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens. The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are seven single non-cemented lenses.

The focal lengths of the first lens to the seventh lens from the first side to the second side are positive, negative, positive, negative, positive, positive and negative in sequence.

The first side surface of the first lens is convex, and the second side surface is concave at the near optical axis.

The first side surface of the second lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the third lens is convex, and the second side surface is concave.

Both the first side surface and the second side surface of the fourth lens are concave.

The first side surface of the fifth lens is concave at the near optical axis, and the second side surface is convex.

Both the first side surface and the second side surface of the sixth lens are convex

The first side surface of the seventh lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the seventh lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 3.40, f ₂ /f is -1.83, f ₃ /f is 0.91, f ₄ /f is -0.38, f ₅ /f is 1.03, f ₆ /f is 0.86 and f ₇ /f is - 1.71; where, f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, f ₅ is the focal length of the fifth lens, f ₆ is the focal length of the sixth lens, f ₇ is the focal length of the seventh lens, and f is the total focal length of the optical imaging lens group. The fourth lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₄ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the fourth lens, and the positive lens with the smallest absolute value of the focal length ratio is the sixth lens, and f ₄ /f+f ₆ /f is 0.48, which is between (-0.5, 0.5).

In the optical imaging lens group provided by Embodiment 10 of the present invention, the overall focal length of the optical imaging lens group is 3.1 mm, the curvature radius of the concave surface of the seventh lens opposite to the scanning curved surface 30 is 0.60 mm, the aperture value is 1.55, and the half angle of view is It is 9 degrees, the scanning radius is 1.7 mm, and the diameter of the entrance pupil is 2 mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 30 are shown in Table 19:

The structural parameters of the optical imaging lens group in the tenth embodiment of Table 19

It should be noted that Table 19 is the detailed structural data of the optical imaging lens group of Embodiment 10, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-16 represent in sequence from the first side to the second The surface of the side; the optical surface whose curvature radius is "infinite" in the imaging plane means a plane.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 40, the field curvature distortion curve is shown in Figure 41, and the vertical axis chromatic aberration curve The figure is shown in Figure 42; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 40-Fig. 42 that the imaging resolution of the optical imaging lens group in the tenth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging lens group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have good imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment Eleven

Fig. 43 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged in sequence from the first side (that is, the side where the diaphragm 41 is located in FIG. 43 ) to the second side (that is, the side where the scanning curved surface 42 is located in FIG. 43 ). First lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and plate glass. It should be noted that the plate glass close to the scanning curved surface 42 is not included in the number of lenses, and its two surfaces are planes for protecting the scanning optical fiber.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, and the first lens, the second lens The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are seven single non-cemented lenses.

The focal lengths of the first lens to the seventh lens from the first side to the second side are positive, negative, positive, negative, positive, positive and positive in sequence.

The first side surface of the first lens is convex, and the second side surface is convex at the near optical axis.

Both the first side surface and the second side surface of the second lens are concave.

The first side surface of the third lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the fourth lens is concave at the near optical axis, and the second side surface is concave.

The first side surface of the fifth lens is convex at the near optical axis, and the second side surface is convex.

Both the first side surface and the second side surface of the sixth lens are convex

The first side surface of the seventh lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the seventh lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 0.59, f ₂ /f is -0.26, f ₃ /f is 0.95, f ₄ /f is -0.40, f ₅ /f is 0.88, f ₆ /f is 1.94 and f ₇ /f is 2.54 ; Wherein, f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, f ₅ is the focal length of the fifth lens, f ₆ is the focal length of the sixth lens, _f7 is the focal length of the seventh lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0, and the fourth lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₄ /f|≤ 1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, the positive lens with the smallest absolute value of the focal length ratio is the first lens, and f ₂ /f+1/f is 0.33, which is between (-0.5, 0.5).

In the optical imaging lens group provided by the eleventh embodiment of the present invention, the overall focal length of the optical imaging lens group is 3.1 mm, the radius of curvature of the concave surface near the seventh lens and the scanning curved surface 42 is 2.17 mm, the aperture value is 1.55, and the half field of view The angle is 9 degrees, the scanning radius is 1.7 mm, and the diameter of the entrance pupil is 2 mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 42 are shown in Table 20:

The structural parameters of the optical imaging lens group in the eleventh embodiment of table 20

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the	the
1	Aperture 41	the	unlimited	1	the	the	the
2	first lens	Aspherical	1.77	1.07	Glass	1.95	32.3
3	the	Aspherical	-539.01	0.27	the	the	the
4	second lens	Aspherical	-3.53	0.56	Glass	1.92	18.9
5	the	Aspherical	1.02	0.34	the	the	the
6	third lens	Aspherical	-1.68	0.80	Glass	1.95	32.3
7	the	Aspherical	-1.30	0.17	the	the	the
8	fourth lens	Aspherical	-1.03	0.62	Glass	1.78	25.7
9	the	Aspherical	33.47	0.09	the	the	the
10	fifth lens	Aspherical	144.56	1.25	Glass	1.75	52.3
11	the	Aspherical	-2.09	0.05	the	the	the
12	sixth lens	Aspherical	4.25	1.05	Glass	1.49	81.6
13	the	Aspherical	-9.41	0.07	the	the	the
14	seventh lens	Aspherical	2.21	1.94	Glass	1.75	52.3
15	the	Aspherical	2.17	0.51	the	the	the
16	plate glass	Aspherical	unlimited	0.30	Glass	1.51	64.2
17	the	Aspherical	unlimited	0.10	the	the	the
18	Scan Surface 42	sphere	1.70	the	the	the	the

It should be noted that Table 20 is the detailed structural data of the optical imaging lens group in Embodiment 11, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-18 represent in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 44, the field curvature distortion curve is shown in Figure 45, and the vertical axis chromatic aberration curve The figure is shown in Figure 46; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 44-Fig. 46 that the imaging resolution of the optical imaging mirror group in the eleventh embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment 12

Fig. 47 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged in sequence from the first side (that is, the side where the diaphragm 43 is located in FIG. 47 ) to the second side (that is, the side where the scanning curved surface 44 is located in FIG. 47 ). First lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and plate glass. It should be noted that the plate glass close to the scanning curved surface 44 is not included in the number of lenses, and its two surfaces are planes for protecting the scanning optical fiber.

In this embodiment, there is an interval between every two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens. The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are seven single non-cemented lenses.

The focal lengths of the first lens to the seventh lens from the first side to the second side are negative, positive, negative, positive, positive, negative and positive in sequence.

The first side surface of the first lens is convex, and the second side surface is concave at the near optical axis.

The first side surface of the second lens is convex, and the second side surface is concave at the near optical axis.

The first side surface of the third lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the fourth lens is concave at the near optical axis, and the second side surface is convex.

The first and second side surfaces of the fifth lens are convex.

The first side surface of the sixth lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the seventh lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the seventh lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is -2.45, f ₂ /f is 0.63, f ₃ /f is -0.26, f ₄ /f is 1.17, f ₅ /f is 0.86, f ₆ /f is -1.15 and f ₇ /f is 0.99; Among them, f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, f ₅ is the focal length of the fifth lens, f ₆ is the focal length of the sixth lens, f ₇ is the focal length of the seventh lens, and f is the total focal length of the optical imaging lens group. The third lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₃ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the third lens, the positive lens with the smallest absolute value of the focal length ratio is the second lens, and f ₃ /f+f ₂ /f is 0.37, which is between (-0.5, 0.5).

In the optical imaging lens group provided by Embodiment 12 of the present invention, the overall focal length of the optical imaging lens group is 3.1 mm, the radius of curvature of the concave surface of the seventh lens close to the scanning curved surface 44 is 5 mm, the aperture value is 1.55, and the half angle of view is It is 9 degrees, the scanning radius is 1.7mm, and the diameter of the entrance pupil is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 44 are as shown in Table 21:

The structural parameters of the optical imaging lens group in the twelveth embodiment of Table 21

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the	the
1	Aperture 43	the	unlimited	1	the	the	the
2	first lens	Aspherical	2.38	0.60	Glass	1.73	29.5
3	the	Aspherical	1.49	0.10	the	the	the
4	second lens	Aspherical	1.23	1.50	Glass	1.83	41.7
5	the	Aspherical	2.33	0.43	the	the	the
6	third lens	Aspherical	-0.64	0.60	Glass	1.82	20.8
7	the	Aspherical	-17.86	0.29	the	the	the
8	fourth lens	Aspherical	-1.90	0.99	Glass	1.93	33.5
9	the	Aspherical	-1.53	0.10	the	the	the
10	fifth lens	Aspherical	10.80	1.07	Glass	1.76	52.3
11	the	Aspherical	-2.38	0.13	the	the	the
12	sixth lens	Aspherical	-2.11	0.60	Glass	1.95	18.1
13	the	Aspherical	-6.18	0.10	the	the	the
14	seventh lens	Aspherical	2.38	2.85	Glass	1.92	32.3
15	the	Aspherical	5.00	0.15	the	the	the
16	plate glass	Aspherical	unlimited	0.30	Glass	1.51	64.19
17	the	Aspherical	unlimited	0.10	the	the	the
18	Scan Surface 44	sphere	1.70	the	the	the	the

It should be noted that Table 21 is the detailed structural data of the optical imaging lens group in Embodiment 12, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-18 represent in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 48, the field curvature distortion curve is shown in Figure 49, and the vertical axis chromatic aberration curve The figure is shown in Figure 50; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 48-Fig. 50 that the imaging resolution of the optical imaging mirror group in the eleventh embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner. Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment Thirteen

Fig. 51 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged in sequence from the first side (that is, the side where the diaphragm 45 is located in FIG. 51 ) to the second side (that is, the side where the scanning curved surface 46 is located in FIG. 51 ). A first lens, a second lens, a third lens and a fourth lens.

In this embodiment, there is an interval between every two adjacent lenses in the first lens, the second lens, the third lens and the fourth lens, and the first lens, the second lens, the third lens and the fourth lens are four A single non-cemented lens.

The focal lengths of the first lens to the fourth lens from the first side to the second side are positive, negative, positive and positive in sequence.

Both the first side surface and the second side surface of the first lens are convex.

The first side surface of the second lens is concave at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens are convex.

The first side surface of the fourth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fourth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 1.42, f ₂ /f is -0.32, f ₃ /f is 0.56, f ₄ /f is 1.36; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the third lens, and f ₂ /f+f ₃ /f is 0.24, which is between (-0.5, 0.5).

In the optical imaging lens group provided by Embodiment 13 of the present invention; the overall focal length of the optical imaging lens group is 2.6 mm, the radius of curvature of the concave surface of the fourth lens opposite to the scanning curved surface 46 is 0.77 mm, the aperture value is 1.3, and the half field of view The angle is 10 degrees, the scan radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 46 are shown in Table 22:

The structural parameters of the optical imaging lens group in the thirteenth embodiment of Table 22

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 45	the	unlimited	1	the	the
2	first lens	Aspherical	12.61	0.97	1.57	52.7
3	the	Aspherical	-2.50	1.42	the	the
4	second lens	Aspherical	-3.25	1.14	1.7	30.5
5	the	Aspherical	0.82	0.15	the	the
6	third lens	Aspherical	1.13	1.30	1.57	63
7	the	Aspherical	-1.90	0.10	the	the
8	fourth lens	Aspherical	0.86	0.98	1.64	56.1
9	the	Aspherical	0.77	0.50	the	the
10	Scan Surface 46	sphere	2	the	the	the

It should be noted that Table 22 is the detailed structural data of the optical imaging lens group of Embodiment 13, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surface 0-10 represents in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fourth lens are shown in Table 23 below:

The aspheric conic coefficient data of different lens surfaces in the thirteenth embodiment of table 23

surface	K	A4	A6	A8
2	-1.09E+02	2.79E-02	1.66E-02	-5.37E-04
3	2.35E-01	7.91E-02	1.08E-02	1.18E-02
4	-2.39E+01	3.41E-02	4.26E-02	-2.59E-02
5	-2.61E+00	-8.53E-02	1.36E-01	-6.27E-02

6	-1.01E+00	-1.21E-01	3.99E-02	4.81E-04
7	-1.77E+00	1.11E-01	-1.29E-01	5.50E-02
8	-1.90E+00	3.36E-01	-1.50E-01	9.71E-02
9	-3.68E-01	-1.29E-01	-6.23E-03	-1.13E+00

Table 23 shows the aspheric coefficient data in Example 13, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging mirror group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 52, the field curvature distortion curve is shown in Figure 53, and the vertical axis chromatic aberration curve The figure is shown in Figure 54; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents the F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 52-Fig. 54 that the imaging resolution of the optical imaging mirror group in the thirteenth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment Fourteen

Fig. 55 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged sequentially from the first side (that is, the side where the diaphragm 47 is located in FIG. 55 ) to the second side (that is, the side where the scanning curved surface 48 is located in FIG. 55 ). A first lens, a second lens, a third lens and a fourth lens.

In this embodiment, there is an interval between every two adjacent lenses in the first lens, the second lens, the third lens and the fourth lens, and the first lens, the second lens, the third lens and the fourth lens are four A single non-cemented lens.

The focal lengths of the first lens to the fourth lens from the first side to the second side are positive, negative, positive and positive in sequence.

The first side surface of the first lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the second lens is convex, and the second side surface is concave at the near optical axis.

Both the first side surface and the second side surface of the third lens are convex.

The first side surface of the fourth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fourth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 1.41, f ₂ /f is -0.37, f ₃ /f is 0.61, f ₄ /f is 1.04; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the third lens, and f ₂ /f+f ₃ /f is 0.24, which is between (-0.5, 0.5).

In the optical imaging lens group provided by Embodiment 14 of the present invention; the total focal length of the optical imaging lens group as a whole is 2.6 mm, the radius of curvature of the concave surface of the fourth lens opposite to the scanning curved surface 48 is 1.13 mm, the aperture value is 1.3, and the half field of view The angle is 10 degrees, the scanning radius is 1.8mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 48 are shown in Table 24:

The structural parameters of the optical imaging lens group in the fourteenth embodiment of table 24

It should be noted that Table 24 is the detailed structural data of the optical imaging lens group of Embodiment 14, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-10 represent in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fourth lens are shown in Table 25 below:

The aspheric conic coefficient data of different lens surfaces in the fourteenth embodiment of table 25

surface	K	A4	A6		A8
2	4.00E+02	3.11E-02	1.88E-02	-3.52E-03
3	-7.88E-01	9.33E-02	6.81E-03	1.18E-02
4	-1.78E+02	3.46E-02	4.75E-02	-2.15E-02
5	-2.65E+00	-6.22E-02	1.37E-01	-7.22E-02
6	-1.02E+00	-1.21E-01	4.42E-02	1.82E-03
7	-5.15E+00	1.08E-01	-1.68E-01	1.06E-01
8	-2.95E+00	3.36E-01	-3.17E-01	9.95E-02
9	-1.06E+00	-1.67E-01	-8.17E-01	7.42E-01

Table 25 shows the aspheric coefficient data in the fourteenth embodiment, wherein k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 56, the field curvature distortion curve is shown in Figure 57, and the vertical axis chromatic aberration curve The figure is shown in Figure 58; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 56-Fig. 58 that the imaging resolution of the optical imaging mirror group in the fourteenth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment 15

Fig. 59 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged sequentially from the first side (that is, the side where the diaphragm 49 is located in FIG. 59 ) to the second side (that is, the side where the scanning curved surface 50 is located in FIG. 59 ). A first lens, a second lens, a third lens and a fourth lens.

In this embodiment, there is an interval between every two adjacent lenses in the first lens, the second lens, the third lens and the fourth lens, and the first lens, the second lens, the third lens and the fourth lens are four A single non-cemented lens.

The focal lengths of the first lens to the fourth lens from the first side to the second side are positive, negative, positive and negative in sequence.

The first side surface of the first lens is convex, and the second side surface is concave at the near optical axis.

The first side surface of the second lens is concave at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens are convex.

The first side surface of the fourth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fourth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 2.02, f ₂ /f is -0.52, f ₃ /f is 0.48, f ₄ /f is -1.02; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of focal length ratio is the second lens, the positive lens with the smallest absolute value of focal length ratio is the third lens, f ₂ /f+f ₃ /f is -0.04, between (-0.5, 0.5) .

In the optical imaging mirror group provided by Embodiment 15 of the present invention; the total focal length of the optical imaging mirror group as a whole is 3 mm, the radius of curvature of the concave surface of the fourth lens opposite to the scanning curved surface 50 is 0.42 mm, the aperture value is 1.5, and the half angle of view is It is 10 degrees, the scanning radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 50 are shown in Table 26:

The structural parameters of the optical imaging lens group in the fifteenth embodiment of Table 26

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 49	the	unlimited	1	the	the
2	first lens	Aspherical	2.86	0.94	1.59	61.9
3	the	Aspherical	12.20	1.37	the	the
4	second lens	Aspherical	-14.44	1.88	1.76	27.6
5	the	Aspherical	1.36	0.11	the	the
6	third lens	Aspherical	1.86	1.61	1.52	67.1
7	the	Aspherical	-0.88	0.10	the	the
8	fourth lens	Aspherical	0.91	0.75	1.72	46.4
9	the	Aspherical	0.42	0.50	the	the
10	Scan Surface 50	sphere	2	the	the	the

It should be noted that Table 26 is the detailed structural data of the optical imaging lens group in Embodiment 15, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surface 0-10 represents in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fourth lens are shown in Table 27 below:

The aspheric conic coefficient data of different lens surfaces in the fifteenth embodiment of table 27

surface	K	A4	A6	A8
2	-3.44E+00	1.66E-02	6.03E-03	7.02E-04
3	-4.00E+02	2.10E-03	8.96E-03	3.17E-03
4	2.32E+02	-1.51E-01	4.88E-02	-9.85E-03
5	-6.62E+00	-1.01E-01	6.87E-02	-2.45E-02
6	-3.75E+00	-6.16E-02	4.91E-02	-1.24E-02
7	-7.65E-01	2.08E-01	-6.97E-02	2.36E-02
8	-1.18E+00	5.34E-02	-1.67E-02	-2.41E-02
9	-1.06E+00	-1.39E+00	1.39E+00	-1.26E+00

Table 27 shows the aspheric coefficient data in Example 15, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 60, the field curvature distortion curve is shown in Figure 61, and the vertical axis chromatic aberration curve The figure is shown in Figure 62; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 60-Fig. 62 that the imaging resolution of the optical imaging lens group of the fifteenth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging lens group can scan the curved surface image of the fiber optic scanner Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment sixteen

Fig. 63 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes a common optical axis arranged in sequence from the first side (that is, the side where the diaphragm 61 is located in FIG. 63 ) to the second side (that is, the side where the scanning curved surface 62 is located in FIG. 63 ). A first lens, a second lens, a third lens and a fourth lens.

In this embodiment, there is an interval between every two adjacent lenses in the first lens, the second lens, the third lens and the fourth lens, and the first lens, the second lens, the third lens and the fourth lens are four A single non-cemented lens.

The focal lengths of the first lens to the fourth lens from the first side to the second side are positive, negative, positive and positive in sequence.

Both the first side surface and the second side surface of the first lens are convex.

The first side surface of the second lens is concave at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens are convex.

The first side surface of the fourth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fourth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 1.52, f ₂ /f is -0.42, f ₃ /f is 1.16, f ₄ /f is 0.65; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the fourth lens, and f ₂ /f+f ₄ /f is 0.23, which is between (-0.5, 0.5).

In the optical imaging mirror group provided by the sixteenth embodiment of the present invention; the total focal length of the optical imaging mirror group as a whole is 2.6 mm, the radius of curvature of the concave surface of the fourth lens opposite to the scanning curved surface 62 is 1.24 mm, the aperture value is 1.3, and the half field of view The angle is 10 degrees, the scan radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 62 are shown in Table 28:

The structural parameters of the optical imaging lens group in the sixteenth embodiment of table 28

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 61	the	unlimited	1	the	the
2	first lens	Aspherical	14.70	1.23	1.54	50.9
3	the	Aspherical	-2.41	1.69	the	the
4	second lens	Aspherical	-1.48	0.60	1.76	27.6
5	the	Aspherical	2.20	0.10	the	the
6	third lens	Aspherical	2.61	0.98	1.49	70.4
7	the	Aspherical	-2.95	0.35	the	the
8	fourth lens	Aspherical	0.82	1.50	1.61	60.6
9	the	Aspherical	1.24	0.50	the	the
10	Scan Surface 62	sphere	2	the	the	the

It should be noted that Table 28 is the detailed structural data of the optical imaging lens group in Embodiment 16, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surfaces 0-10 represent in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fourth lens are shown in Table 29 below:

The aspheric conic coefficient data of different lens surfaces in the sixteenth embodiment of table 29

surface	K	A4	A6	A8
2	-4.49E+01	1.23E-02	5.41E-03	1.44E-03
3	4.40E-02	6.09E-02	-2.00E-03	7.68E-03
4	-3.47E+00	3.26E-02	5.49E-02	-3.22E-02
5	-2.79E+01	-1.43E-01	1.34E-01	-4.70E-02
6	1.38E+00	-9.19E-02	4.04E-02	-1.08E-02
7	-4.00E-01	1.11E-01	-8.47E-02	2.99E-02

8	-1.74E+00	2.03E-01	-6.56E-02	4.15E-02
9	5.73E-01	2.39E-01	-1.41E-01	-8.23E-01

Table 29 shows the aspheric coefficient data in the sixteenth embodiment, wherein k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 64, the field curvature distortion curve is shown in Figure 65, and the vertical axis chromatic aberration curve The figure is shown in Figure 66; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 64-Fig. 66 that the imaging resolution of the optical imaging mirror group in the sixteenth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging mirror group can scan the curved surface image of the fiber optic scanner Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

Embodiment 17

Fig. 67 is a schematic structural diagram of an optical imaging lens group provided by an embodiment of the present invention. The optical imaging lens group includes the common optical axes arranged sequentially from the first side (that is, the side where the diaphragm 63 is located in FIG. 67 ) to the second side (that is, the side where the scanning curved surface 64 is located in FIG. 67 ). A first lens, a second lens, a third lens and a fourth lens.

In this embodiment, there is an interval between every two adjacent lenses in the first lens, the second lens, the third lens and the fourth lens, and the first lens, the second lens, the third lens and the fourth lens are four A single non-cemented lens.

The focal lengths of the first lens to the fourth lens from the first side to the second side are positive, negative, positive and positive in sequence.

The first side surface of the first lens is concave at the near optical axis, and the second side surface is convex.

The first side surface of the second lens is concave at the near optical axis, and the second side surface is concave.

Both the first side surface and the second side surface of the third lens are convex.

The first side surface of the fourth lens is convex, and the second side surface is concave at the near optical axis.

In this embodiment, the focal lengths of the first lens to the fourth lens in the optical imaging lens group satisfy the following relationship:

f ₁ /f is 1.51, f ₂ /f is -0.48, f ₃ /f is 1.15, f ₄ /f is 0.73; where f ₁ is the focal length of the first lens, f ₂ is the focal length of the second lens, f ₃ is the focal length of the third lens, f ₄ is the focal length of the fourth lens, and f is the total focal length of the optical imaging lens group. The second lens is a negative lens, and its focal length and f satisfy the following relationship: 0.2≤|f ₂ /f|≤1.0. The negative lens with the smallest absolute value of the focal length ratio is the second lens, and the positive lens with the smallest absolute value of the focal length ratio is the fourth lens, and f ₂ /f+f ₄ /f is 0.25, which is between (-0.5, 0.5).

In the optical imaging lens group provided by the seventeenth embodiment of the present invention; the overall focal length of the optical imaging lens group is 2.6mm, the radius of curvature of the concave surface of the fourth lens opposite to the scanning curved surface 64 is 1.26mm, the aperture value is 1.3, and the half field of view The angle is 10 degrees, the scan radius is 2mm, and the entrance pupil diameter is 2mm. The preferred parameters of the radius of curvature, thickness parameter, refractive index and dispersion coefficient of each lens imaging the scanning curved surface 64 are shown in Table 30:

The structural parameters of the optical imaging mirror group in the seventeenth embodiment of table 30

surface	Lens serial number	Face shape	radius of curvature	Thickness/pitch	Material Refractive Index		Dispersion coefficient
0	imaging plane	flat	unlimited	unlimited	the	the
1	Aperture 63	the	unlimited	1	the	the
2	first lens	Aspherical	-41.74	1.44	1.53	66.7
3	the	Aspherical	-2.00	1.66	the	the
4	second lens	Aspherical	-1.46	0.60	1.65	33.8
5	the	Aspherical	2.17	0.10	the	the
6	third lens	Aspherical	2.48	1.02	1.49	70.4
7	the	Aspherical	-3.09	0.60	the	the
8	fourth lens	Aspherical	0.82	1.47	1.55	64.4
9	the	Aspherical	1.26	0.50	the	the
10	Scan Surface 64	sphere	2	the	the	the

It should be noted that Table 30 is the detailed structural data of the optical imaging lens group of the seventeenth embodiment, wherein the units of the radius of curvature, thickness and focal length are millimeters, and the surface 0-10 represents in sequence from the first side to the second The surface on both sides; the optical surface whose curvature radius is "infinite" in the imaging plane refers to a plane.

Further, the aspheric conic coefficients of the surfaces corresponding to the first lens to the fourth lens are shown in Table 31 below:

The aspheric conic coefficient data of different lens surfaces in the seventeenth embodiment of table 31

surface	K	A4	A6		A8
2	1.84E+02	1.14E-02	5.76E-03	1.16E-03
3	-2.81E-01	6.57E-02	-2.36E-03	7.11E-03
4	-3.35E+00	3.24E-02	5.69E-02	-3.04E-02
5	-2.37E+01	-1.41E-01	1.34E-01	-4.63E-02
6	1.43E+00	-9.01E-02	4.08E-02	-1.18E-02
7	-3.04E-01	1.10E-01	-8.47E-02	3.05E-02
8	-1.65E+00	2.10E-01	-6.09E-02	4.01E-02
9	1.24E+00	2.88E-01	-5.78E-01	-5.99E-01

Table 31 shows the aspheric coefficient data in Example 17, wherein k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

Further, after testing, when the above-mentioned optical imaging lens group is used to project the image light corresponding to the scanning surface, its optical transfer function curve is shown in Figure 68, the field curvature distortion curve is shown in Figure 69, and the vertical axis chromatic aberration curve The figure is shown in Figure 70; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, and the field curvature distortion curve represents F-Tan (theta) distortion under different viewing angles Size value (percentage), the vertical axis chromatic aberration graph represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

It can be seen from Fig. 68-Fig. 70 that the imaging resolution of the optical imaging lens group of the seventeenth embodiment is good in the whole field of view, and the distortion and chromatic aberration of the optical system are small, so the optical imaging lens group can scan the curved surface image of the fiber optic scanner Clear imaging, all have better imaging effect.

Of course, in practical applications, the optical imaging mirror group can also include a display element, a housing, etc., the display element can be arranged on the second side of the optical imaging mirror group, and the optical imaging mirror group can be installed in the housing, that is, the image source (Such as a fiber optic scanner) The curved surface image formed by scanning is imaged on a plane to achieve clear imaging.

scan display device

The aforementioned optical imaging mirror group can cooperate with a fiber optic scanner (or a corresponding fiber optic scanning module) to constitute a scanning display device in the embodiment of the present application (as shown in Figure 1a and Figure 1b, the optical imaging mirror group is arranged on the fiber optic scanning The optical path of the light output of the device), wherein the first side of the optical imaging mirror group faces the direction of scanning the light output of the fiber scanner, and the preferred mode is that the optical imaging mirror group is coaxial with the central optical axis of the fiber scanner. Of course, for the structure and general principle of the optical fiber scanner, reference may be made to the content corresponding to the aforementioned FIG. 1a and FIG. 1b , so details will not be repeated here.

near-eye display device

In this application, the scanning display device can be further applied to a near-eye display device, and can be combined with a near-eye display module to form a near-eye display device in the embodiment of this application, which can be used as a head-mounted AR device (eg, AR glasses). The scanning display device is arranged in a near-eye display module.

Among them, the near-eye display module may include: a light source, a processing control circuit, a wearable frame structure, a waveguide, and the like. The image beam output by the light source enters the scanning display device, and is scanned by the fiber optic scanner and output to the optical display mirror group. After the scanning surface of the fiber scanner (refer to the scanning curved surface 230 in FIG. It is the imaging plane (refer to the imaging plane 240 in FIG. 2 ), which is coupled into the waveguide as the entrance pupil surface of the waveguide, and then coupled out through the waveguide expansion imaging and enters the human eye.

As another possible implementation, the scanning display device can further cooperate with a near-eye display module to form a near-eye display device in the embodiment of the present application, which can be used as a head-mounted VR device (such as: VR helmet/glasses). The scanning display device is arranged in a near-eye display module.

To sum up, in the embodiment of the present application, the lens surface structure and curvature radius close to the curved surface image among the multiple coaxial lenses of the optical imaging lens group are limited so that they can match the corresponding scanning curved surface radius , so as to achieve clear imaging from curved surface images to flat images; through a reasonable number of lens combination configurations, the optical imaging lens group can coordinate and balance the requirements of imaging quality, miniaturization and processing technology according to changes in application scenarios; The focal length, refractive index, dispersion coefficient and surface structure of some lenses in the multiple lenses are optimized to further improve the imaging quality.

The above are only preferred specific embodiments of the application, and each embodiment is only used to illustrate the technical solutions of the application rather than limit the application. Those skilled in the art can use logical analysis, reasoning or effective All technical solutions that can be obtained through experiments should be within the scope of this application.

Each embodiment in the present application is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments.

The expression "first", "second", "the first" or "the 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 corresponding components. The above expressions are configured only for the purpose of distinguishing an element from other elements. For example, a first lens and a second lens represent different lenses although both are lenses.

Claims (19)

1. An optical imaging lens group, characterized in that the optical imaging lens group includes a plurality of lenses, and at least one negative lens is included in the plurality of lenses;

   The plurality of lenses are sequentially arranged on common optical axes from the first side to the second side of the optical imaging lens group, the second side of the optical imaging lens group corresponds to a curved surface image, and all the optical imaging lens groups The first side corresponds to a planar image;

   The lens surface close to and opposite to the curved image is concave.
2. The optical imaging lens set according to claim 1, characterized in that, the radius of curvature of the concave surface is 0.4-5.15mm.
3. The optical imaging lens set according to claim 1, wherein the number of the plurality of lenses is 3 or 4 or 5 or 6 or 7 or 8.
4. The optical imaging lens set according to claim 1, wherein the concave surface is located at the near optical axis corresponding to the lens surface.
5. The optical imaging lens set according to claim 4, wherein the lens surface opposite to the curved image is a convex surface at the far optical axis.
6. The optical imaging lens group according to claim 1, wherein the focal length fi _and f of at least one lens in the plurality of lenses _always have the following relationship:

   0.2≤|f _i /f _total |≤1.2, wherein, f is _always the focal length of the optical imaging lens group, and the f _i is the i-th sequentially along the optical axis from the first side to the second side The focal length of a lens, the i is an integer greater than or equal to 1.
7. The optical imaging lens group according to claim 6, wherein the focal length _f of at least one negative lens in the plurality of lenses has the _following relationship with f:

   0.2≤|f _negative /f _total |≤1.0, wherein, f _total is the focal length of the optical imaging lens group, and the f _negative is the focal length of the negative lens in the plurality of lenses.
8. The optical imaging lens group according to claim 7, wherein the focal length _f of only one negative lens among the plurality of lenses has the _following relationship with f:

   0.2≤|f _negative /f _total |≤1.0, wherein, f _total is the focal length of the optical imaging lens group, and the f _negative is the focal length of the negative lens in the plurality of lenses.
9. The optical imaging lens group according to claim 1, wherein the Abbe number of at least one negative lens is in the range of 16-33.
10. The optical imaging lens group according to claim 1, wherein the refractive index of the negative lens with the smallest Abbe number among the plurality of lenses satisfies the following relationship:

    If the negative lens with the smallest Abbe number is a plastic lens, the corresponding refractive index range is between 1.5-1.7.
11. The optical imaging lens set according to claim 10, wherein if the negative lens with the smallest Abbe number is a glass lens, the corresponding refractive index range is between 1.7-1.9.
12. The optical imaging lens group according to claim 1, wherein the plurality of lenses includes at least one positive lens, and among the plurality of lenses, a negative lens and a positive lens whose absolute value of the focal length ratio is the smallest satisfy the following requirements relation:

    The range of f _negative /f _total +f _positive /f _total is between (-0.5, 0.5), wherein, f _negative is the focal length of the negative lens whose focal length accounts for the smallest absolute value among the plurality of lenses, and f _positive is the focal length of the positive lens having the smallest absolute value of the focal length among the plurality of lenses, and f is _always the focal length of the optical imaging lens group.
13. The optical imaging lens set according to claim 12, characterized in that the range of f _negative /f _total +f _positive /f _total is between (-0.25, 0.25).
14. The optical imaging lens set according to claim 1, wherein the two lenses close to the curved image have two adjacent lens surfaces, and the two adjacent lens surfaces are both convex surfaces.
15. The optical imaging lens group according to claim 1, wherein the second said lens and the third said lens close to said curved surface image have two adjacent lens surfaces, and the adjacent two said lenses The lens surface is convex and concave at the near optical axis.
16. The optical imaging lens group according to claim 1, wherein the plurality of lenses are arranged at intervals and connected.
17. A scanning display device, characterized in that it comprises a fiber optic scanner and the optical imaging lens group according to any one of claims 1 to 16, the fiber scanner is used to scan and emit light of an image to be displayed, the The optical imaging lens group is used to enlarge and project the scanning surface corresponding to the light emitted by the fiber optic scanner;

    Wherein, the optical fiber scanner includes an actuator and an optical fiber fixed on the actuator, the part of the optical fiber exceeding the actuator forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator two-dimensional scanning.
18. A near-eye display device, characterized in that the near-eye display device is used as a head-mounted augmented reality device, at least including a near-eye display module and a scanning display device according to claim 17, the scanning display device is arranged on the In the near-eye display module mentioned above.
19. A near-eye display device, characterized in that the near-eye display device is used as a head-mounted virtual reality device, at least including a near-eye display module and a scanning display device according to claim 17, the scanning display device is arranged on the In the near-eye display module mentioned above.

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