CN112857754B

CN112857754B - Near-eye display detection lens and near-eye display device

Info

Publication number: CN112857754B
Application number: CN202110210108.3A
Authority: CN
Inventors: 蒋楚豪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2023-06-30
Anticipated expiration: 2041-02-24
Also published as: CN112857754A; WO2022179289A1

Abstract

The application provides a near-eye display detection lens and a near-eye display device, and relates to the technical field of optics. In the application, the diaphragm is used for transmitting light; the first lens group is used for receiving and transmitting the light rays passing through the diaphragm, and comprises a first double-cemented lens for transmitting the light rays; the second lens group is used for receiving and transmitting the light passing through the first lens group, the third lens group is used for receiving and transmitting the light passing through the second lens group, and the photosensitive assembly is used for receiving the light passing through the third lens group. The near-to-eye display detection lens can be used for replacing manual observation and detection of AR/VR products, the diaphragm is arranged in front to simulate the human eye structure, and chromatic aberration is eliminated through the design and cooperation of the double-cemented lenses in the lens groups, so that the detection effect of the near-to-eye display detection lens on the AR/VR products is closer to the effect of human eye observation and detection, the detection efficiency is improved, and misjudgment in the detection process is reduced.

Description

Near-eye display detection lens and near-eye display device

Technical Field

The application relates to the technical field of optics, in particular to a near-eye display detection lens and a near-eye display device.

Background

With the popularity of VR (virtual reality acronym) technology and AR (augmented reality acronym) technology, AR/VR products continue to emerge, for which imaging quality has become a focus of consumer attention. In general, the judgment is carried out by human eyes, misjudgment caused by subjective judgment of individuals is easy to cause, and the mode of human eyes is not suitable for detection work of mass products.

Disclosure of Invention

In one aspect, the present disclosure provides a near-eye display detection lens, including:

a diaphragm for transmitting light;

the first lens group is used for receiving and transmitting the light passing through the diaphragm, and converging the light, and comprises a first double-cemented lens for transmitting the light;

a second lens group for receiving and transmitting the light passing through the first lens group, for converging the light, the second lens group comprising a plurality of single lenses and a second double cemented lens transmitting the light;

the third lens group is used for receiving and transmitting the light passing through the second lens group and converging the light, and comprises a plurality of groups of double-cemented lenses and at least one single lens which sequentially transmit the light; and

And a photosensitive assembly for receiving the light passing through the third lens group.

Another aspect of the embodiments of the present application provides a near-eye display device, which includes a housing and the near-eye display detection lens described above, where the near-eye display detection lens is mounted on the housing.

The application provides a near-to-eye display detection lens can be used to replace the manual work to go to observe, detect AR/VR product, and this application is through leading with the simulation human eye structure to through the design and the cooperation of two cemented lens among the multiunit lens group eliminate the colour difference, make near-to-eye display detection lens carry out the detection effect that detects to AR/VR product more be close to the effect that human eye observed, detected, improved detection efficiency, reduced the erroneous judgement in the testing process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a near-to-eye display detection lens according to an embodiment of the present disclosure;

FIG. 2 is a graph showing the MTF of a near-to-eye display detection lens imaging an infinitely distant object according to one embodiment of the present application;

FIG. 3 is a graph showing the MTF of a near-to-eye display detection lens imaging a 2.5m object in accordance with one embodiment of the present application;

FIG. 4 is a graph showing the MTF of a near-to-eye display detection lens imaging a 0.5m object in accordance with one embodiment of the present application;

FIG. 5 is a diagram of a near-to-eye display detection lens for imaging an infinitely distant object according to an embodiment of the present application;

FIG. 6 is a graph showing distortion of a near-to-eye display detection lens imaging an infinitely distant object according to one embodiment of the present application;

FIG. 7 is a diagram of a field curvature of a near-to-eye display detection lens for imaging a 2.5m object according to an embodiment of the present application;

FIG. 8 is a graph showing distortion of a near-to-eye display detection lens for imaging a 2.5m object according to one embodiment of the present application;

FIG. 9 is a diagram of a field curvature of a near-to-eye display detection lens for imaging a 0.5m object according to an embodiment of the present application;

FIG. 10 is a graph showing distortion of a near-to-eye display detection lens imaging a 0.5m object according to one embodiment of the present application;

FIG. 11 is a graph of defocus for an exemplary near-to-eye display detection lens imaging an object at infinity;

FIG. 12 is a graph showing defocus of a detection lens for imaging a 2.5m object according to one embodiment of the present application;

FIG. 13 is a graph showing defocus of a detection lens for near-to-eye imaging of a 0.5m object according to one embodiment of the present application;

FIG. 14 is a schematic diagram of a near-to-eye display detection lens according to another embodiment of the present disclosure;

FIG. 15 is a graph showing the MTF of a near-to-eye display detection lens imaging an infinitely distant object according to another embodiment of the present application;

FIG. 16 is a graph showing the MTF of a near-to-eye display detection lens imaging a 2.5m object in accordance with another embodiment of the present application;

FIG. 17 is a graph showing the MTF of a near-to-eye display detection lens imaging a 0.5m object in accordance with another embodiment of the present application;

FIG. 18 is a diagram of a near-to-eye display detection lens for imaging an infinitely distant object according to another embodiment of the present application;

FIG. 19 is a graph showing distortion of a near-to-eye display detection lens for imaging an infinitely distant object according to another embodiment of the present application;

FIG. 20 is a diagram showing a field curvature of a near-to-eye display detection lens imaging a 2.5m object according to another embodiment of the present application;

FIG. 21 is a graph showing distortion of a near-to-eye display detection lens for imaging a 2.5m object according to another embodiment of the present application;

FIG. 22 is a diagram showing a field curvature of a near-to-eye display detection lens imaging a 0.5m object according to another embodiment of the present application;

FIG. 23 is a graph showing distortion of a near-to-eye display detection lens for imaging a 0.5m object according to another embodiment of the present application;

FIG. 24 is a graph showing defocus for a near-eye display detection lens imaging an infinitely distant object according to another embodiment of the present application;

FIG. 25 is a graph showing defocus for a near-eye display detection lens imaging a 2.5m object according to another embodiment of the present application;

FIG. 26 is a graph showing defocus for a near-eye display detection lens imaging a 0.5m object according to another embodiment of the present application.

Detailed Description

The present application is described in further detail below with reference to the drawings and the embodiments. It is specifically noted that the following embodiments are merely for illustrating the present application, but do not limit the scope of the present application. Likewise, the following embodiments are only some, but not all, of the embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

Headsets and other electronic devices may be used in virtual reality and mixed reality (augmented reality) systems. These devices may include portable consumer electronic devices (e.g., portable electronic devices such as cellular telephones, tablet computers, eyeglasses, other wearable equipment), overhead displays in cabins, vehicles, etc., display-based devices (projectors, televisions, etc.). Devices such as these may include displays and other optical components. The configuration of a device that provides virtual reality and/or mixed reality content to a user (viewer) with a head mounted display device is described herein as an example. However, this is merely illustrative. Any suitable means may be used to provide visual content, such as virtual reality and/or mixed reality content, to a user.

A headset worn on the head of a user, such as augmented reality glasses, may be used to provide computer-generated content to the user that is overlaid on top of real-world content. The real world content is directly viewable by the user through the transparent portion of the optical system. The optical system may be used to route the image from one or more pixel arrays in the display system to the user's eyes. A waveguide, such as a thin planar waveguide formed from a sheet of transparent material (such as glass or plastic) or other light guide, may be included in the optical system to convey image light from the pixel array to a user. The display system may include a reflective display, such as a liquid crystal on silicon display, a microelectromechanical system (MEMS) display, or other display.

Referring to fig. 1, a schematic structure diagram of a near-eye display detection lens 100 according to an embodiment of the present application is disclosed, where the near-eye display detection lens 100 may be used to detect the display of the above-mentioned head-mounted device and other electronic devices providing virtual reality and/or mixed reality and/or augmented reality contents, and may detect defects such as uneven brightness and chromaticity, dead pixels, line defects, cloud speckles, and unclear defects of the display. The near-eye display detection lens 100 realizes objective judgment of the quality of a display by a machine by simulating human eye structure instead of manual detection.

The near-eye display detection lens 100 may include a stop 10 for transmitting light, a first lens group 20 having a positive refractive power for receiving and transmitting light passing through the stop 10, a second lens group 30 having a positive refractive power for receiving and transmitting light passing through the first lens group 20, a third lens group 40 having a positive refractive power for receiving and transmitting light passing through the second lens group 30, and a photosensitive assembly 50 for receiving light passing through the third lens group 40.

In addition, the terms "including" and "comprising" in the present specification may include, in addition to the constituent elements mentioned above: a single lens having substantially no refractive power; for example, optical elements other than a single lens, such as an aperture, a filter, and a cover glass; and lens flanges, lens barrels, imaging elements, and the like.

In addition, the term "group having positive refractive power" in this specification means that the group has positive refractive power as a whole, that is, has an ability to concentrate light. The same "group having negative refractive power" means that the group as a whole has negative refractive power, that is, has the ability to diverge light. "single lens having positive refractive power" has the same meaning as "positive lens". The "single lens having negative refractive power" has the same meaning as the "negative lens". The "lens group" is not limited to a configuration including a plurality of single lenses, and may include only 1 single lens.

A compound aspherical lens (a lens in which a spherical single lens and an aspherical film formed on the spherical single lens are integrally formed and functions as 1 aspherical single lens as a whole) is used as a 1-piece single lens without being regarded as a cemented lens. The sign and shape of the refractive power of the single lens including the aspherical surface are considered in the paraxial region unless otherwise specified.

It is noted that the terms "first," "second," and the like herein and below are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first", "second", etc. may include one or more of the features, either explicitly or implicitly.

It will be appreciated that the designations of "first lens group", "second lens group", "third lens group", and "lens group" etc. may be interchangeable in some embodiments. For example, in one embodiment, the "first lens group" in other embodiments is referred to as a "second lens group", and correspondingly, the "second lens group" in other embodiments is referred to as a "first lens group".

The diaphragm 10 is located at the forefront end of the near-eye display detection lens 100 for simulating the pupil of the human eye, and can limit the clear aperture of the near-eye display detection lens 100.

In order to make the near-eye display detection lens 100 better simulate the human eye, the diaphragm diameter of the diaphragm 10 may be controlled to 3mm-5mm. In one embodiment, the aperture diameter is 3mm, and in one embodiment, the aperture diameter may be 4mm. In one embodiment, the aperture diameter may be 5mm. It will be appreciated that the diaphragm diameter may be adjusted up or down as required, and will not be described in detail herein.

The first lens group 20 may include a first cemented doublet 21 having positive refractive power for transmitting light, which is advantageous in suppressing chromatic aberration of magnification.

In an embodiment, the first doublet lens 21 may include a first sub-negative lens 211 and a first sub-positive lens 212 that sequentially transmit light.

In an embodiment, the light receiving surface of the first sub-negative lens 211 far from the first sub-positive lens 212 is concave, and the light emitting surface of the first sub-positive lens 212 far from the first sub-negative lens 211 is convex.

In another embodiment, the first lens group 20 may be configured to include a first positive lens 22 in addition to the first double cemented lens 21 described above. In this case, the distribution of the positive refractive power of the first lens group 20 on the object side can be increased, and therefore, the positive refractive power can be prevented from being biased to the second lens group 30 and the third lens group 40, and the spherical aberration can be easily corrected.

In an embodiment, the light receiving surface of the first positive lens 22 facing the first sub-positive lens 212 is convex, and the light emitting surface of the first positive lens 22 facing away from the first sub-positive lens 212 is convex.

In one embodiment, the number of lenses constituting the first lens group 20 is set to 3 or less, which is advantageous in downsizing. Further, by providing the first lens group 20 with a group having positive refractive power, the diameter of the other lens on the image side of the first lens group 20 can be reduced, thereby contributing to weight saving.

In an embodiment, the first lens group 20 is configured to include, in order from the object side to the image side, a first cemented lens 21 having positive refractive power as a whole and a first positive lens 22 having positive refractive power. In this way, in the case where the first lens group 20 includes 2 lens components having positive refractive power, light rays can be gradually bent, the amount of aberration generation can be reduced, and image surface bending can be suppressed, as compared with the case where the first lens group 20 includes 1 lens component having positive refractive power. Here, 1 lens component means 1 first positive lens 22 or 1 first double cemented lens 21.

In an embodiment, the effective focal length f1 of the first lens group 20 is 40mm < f1<50mm.

In one embodiment, the effective focal length f1 may be 40mm, 50mm, or one of 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, etc.

It is understood that the lenses included in the first lens group 20 may each be a spherical lens.

The second lens group 30 may include a plurality of single lenses 31 for transmitting light rays and a second double cemented lens 32 having a positive refractive power for transmitting light rays. Wherein, the plurality of single lenses 31 may be distributed at both sides of the second double cemented lens 32.

The second double cemented lens 32 may include a second sub-positive lens 321 and a second sub-negative lens 322 that sequentially transmit light rays, which is advantageous for chromatic aberration correction. Of course, the second lens group 30 may be provided with additional cemented doublets in addition to the second cemented doublet 32.

In an embodiment, the light receiving surface of the second sub-positive lens 321 far from the second sub-negative lens 322 is a convex surface, and the light emitting surface of the second sub-negative lens 322 far from the second sub-positive lens 321 is a concave surface.

The arrangement of the plurality of single lenses 31 is advantageous for aberration correction, and correction of image surface curvature and astigmatism can be facilitated in the case where an aspherical single lens is arranged in the plurality of single lenses 31.

In an embodiment, the single lens 31 may include a second positive lens 311, a first negative lens 312, a second negative lens 313, and a third positive lens 314 that sequentially transmit light. Wherein the second double cemented lens 32 is located between the second positive lens 311 and the first negative lens 312.

The arrangement of the second positive lens 311 in the plurality of single lenses 31 can reduce the diameter of the other lens on the image side than the second positive lens 311, thereby contributing to weight saving.

In an embodiment, the light receiving surface of the second positive lens 311 facing the first lens group 20 is convex, and the light emitting surface of the second positive lens 311 facing the second sub-positive lens 321 is convex. In order to reduce the diameter of the other lens on the image side of the second positive lens 311, the radius of curvature of the light receiving surface of the second positive lens 311 is smaller than the radius of curvature of the light emitting surface.

In an embodiment, the light receiving surface of the first negative lens 312 facing the second sub-negative lens 322 is a concave surface, and the light emitting surface of the first negative lens 312 facing away from the second sub-negative lens 322 is a concave surface.

In one embodiment, the lens surface (i.e., the light receiving surface) of the second negative lens 313 adjacent to the second double cemented lens 32 is concave. In this case, the concave surface and the convex surface which is the lens surface on the side of the third positive lens 314 away from the second negative lens 313 (i.e., the light-emitting surface) can prevent the off-axis light from being greatly refracted, and thus the amount of aberration generation can be suppressed.

In an embodiment, the light receiving surface of the second negative lens 313 facing the first negative lens 312 is concave, and the light emitting surface of the second negative lens 313 facing the third positive lens 314 is convex.

In an embodiment, the light receiving surface of the third positive lens 314 facing the second negative lens 313 is convex, and the light emitting surface of the third positive lens 314 facing away from the second negative lens 313 is convex.

In one embodiment, by providing the second lens group 30 as a group having positive refractive power, the diameter of the single lens on the image side of the second lens group 30 can be reduced, thereby contributing to weight saving.

In an embodiment, the effective focal length f2 of the second lens group 30 is 145mm < f2<152mm.

In an embodiment, the effective focal length f2 may be 145mm, 152mm, or one of 146mm, 147mm, 148mm, 149mm, 150mm, 151mm, etc.

It is understood that the single lenses included in the second lens group 30 may each be a spherical lens.

The third lens group 40 includes a plurality of groups of double cemented lenses 41 having positive refractive power and sequentially transmitting light rays, and at least one single lens 42.

In particular, the plural sets of the double cemented lenses 41 facilitate correction of chromatic aberration. The multiple sets of the double cemented lenses 41 may be three sets, and are a third double cemented lens 411, a fourth double cemented lens 412 and a fifth double cemented lens 413 that sequentially transmit light.

In an embodiment, the third doublet 411 may include a third sub-positive lens 4111 and a third sub-negative lens 4112 that sequentially transmit light.

In an embodiment, the light receiving surface of the third sub-positive lens 4111 far from the third sub-negative lens 4112 is convex, and the light emitting surface of the third sub-negative lens 4112 far from the third sub-positive lens 4111 is concave.

In one embodiment, the fourth doublet 412 includes a fourth sub-negative lens 4121 and a fourth sub-positive lens 4122 that sequentially transmit light.

In an embodiment, the light receiving surface of the fourth sub-negative lens 4121 far from the fourth sub-positive lens 4122 is concave, and the light emitting surface of the fourth sub-positive lens 4122 far from the fourth sub-negative lens 4121 is convex.

In one embodiment, the fifth double cemented lens 413 includes a fifth sub-positive lens 4131 and a fifth sub-negative lens 4132 that sequentially transmit light.

In an embodiment, the light receiving surface of the fifth sub-positive lens 4131 far from the fifth sub-negative lens 4132 is convex, and the light emitting surface of the fifth sub-negative lens 4132 far from the fifth sub-positive lens 4131 is convex.

In an embodiment, at least one single lens 42 may include a fourth positive lens 421.

In an embodiment, the light receiving surface of the fourth positive lens 421 facing the fifth sub-negative lens 4132 is convex, and the light emitting surface of the fourth positive lens 421 facing away from the fifth sub-negative lens 4132 is convex.

In one embodiment, the effective focal length f3 of the third lens group 40 is 49mm < f3<55mm.

In one embodiment, the effective focal length f3 may be 49mm, 55mm, or one of 50mm, 51mm, 52mm, 53mm, 54mm, etc.

It is understood that the lenses included in the third lens group 40 may each be a spherical single lens.

The photosensitive assembly 50 may include a photosensitive member. The photosensitive member may be a photosensitive chip. The photosensitive member may be a complementary metal oxide semiconductor (CMOS, complementary Metal Oxide Semiconductor) photosensitive element or a Charge-coupled Device (CCD) photosensitive element, and of course, the photosensitive member 50 may be a photosensitive member including a photosensitive member, and it is understood that the photosensitive member is not limited to a photosensitive chip, but may be any other photosensitive member.

In one embodiment, the photosensitive member is a CMOS chip having an effective photosensitive area diagonal dimension of 16.4mm to 17mm and an effective photosensitive area aspect ratio of 16:9, the effective pixel number is 5320 H.3032V.

In one embodiment, the effective light emitting area of the CMOS chip has a diagonal dimension of 15.5mm to 16mm and the effective light sensing area has an aspect ratio of 3:2, the effective pixel number is 5472 H.3648V.

In one embodiment, photosensitive assembly 50 may also include a glass cover plate. Namely, the effective photosensitive surface of the CMOS chip is provided with a glass cover plate to protect the effective photosensitive surface. The glass cover plate may exist in a stand-alone form or in an integrated package on a CMOS chip.

In one embodiment, the glass cover plate has a thickness in the range of 0.3mm to 0.8mm.

In one embodiment, the glass cover plate may have a thickness of 0.3mm, 0.8mm, or one of 0.4mm, 0.5mm, 0.6mm, 0.7mm, etc.

In one embodiment, the near-eye display detection lens 100 has a diagonal field angle FOV of 58-62.

In one embodiment, the total optical length TTL of the near-eye display detection lens 100 is TTL less than or equal to 300mm.

In one embodiment, the focal length f of the near-eye display detection lens 100 may be-15 mm.ltoreq.f.ltoreq.15.15 mm.

In one embodiment, the focal length f of the near-eye display detection lens 100 may be-14 mm.ltoreq.f.ltoreq.15.15 mm.

In one embodiment, the focal length f of the near-eye display detection lens 100 may be one of-13 mm, -12mm, -11mm, -10mm, -9mm, -8mm, -7mm, -6mm, -5mm, -4mm, -3mm, -2mm, -1mm, 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

In one embodiment, the near-eye display detection lens 100 has good imaging quality for objects with an object distance of 0.5m to infinity.

In the case of using the above 16 lenses and the front stop 10, the present application makes the diagonal field angle FOV of the near-eye display detection lens 100 60 ° and the angular resolution 102PPD. Compared with the prior art, the invention greatly improves the imaging quality on the basis of ensuring that the field angle meets the detection requirement, and plays a positive role in controlling the quality of displays of head-mounted equipment and other electronic equipment for providing virtual reality and/or mixed reality and/or augmented reality contents.

To further illustrate the imaging effect of the near-eye display detection lens 100 shown in fig. 1, the parameters of the lens according to one embodiment of the present application may be as follows:

in this embodiment, the near-to-eye display detection lens 100 has a field angle FOV in the diagonal direction of 60 °, a horizontal to vertical field ratio of 16:9, an optical total length TTL of 300mm, a focal length f of-14.5492 mm, a maximum optical aperture of 40.15mm, and a diaphragm aperture of 4mm. In this example, the photosensitive assembly 50 used was a 1.1 inch effective photosensitive area CMOS photosensitive chip, using an effective photosensitive area of 14.595mm× 8.319 mm.

In this embodiment, the effective focal length f1 of the first lens group 20 is 45.785mm, the effective focal length f2 of the second lens group 30 is 148.611mm, and the effective focal length f3 of the third lens group 40 is 52.702mm; the near-eye display detection lens 100 can perform high-quality imaging on an object with infinity to 0.5m, and the rear intercept (the thickness of the 28 th surface in the fourth positive lens 421) needs to be changed when different shooting distances are needed; the thickness, radius of curvature and material parameters of each element in this example are listed in the table.

Referring to fig. 2, 3 and 4, fig. 2 discloses an MTF (Modulation Transfer Function ) graph of the near-eye display detection lens 100 for imaging an infinitely distant object in an embodiment of the present application, fig. 3 discloses an MTF graph of the near-eye display detection lens 100 for imaging a 2.5m object in an embodiment of the present application, and fig. 4 discloses an MTF graph of the near-eye display detection lens 100 for imaging a 0.5m object in an embodiment of the present application, wherein the MTF can evaluate the ability of the near-eye display detection lens 100 to restore contrast. The vertical axis represents the OTF (Optical Transfer Function ) modulus value, and the horizontal axis represents the spatial frequency.

In FIG. 2, the spatial frequency ranges from 0 to 182lp/mm, and the OTF mode values are all above 0.3, wherein at a spatial frequency of 18.2lp/mm, the OTF mode values are all above 0.9, at a spatial frequency of 36.4lp/mm, the OTF mode values are all above 0.8, at a spatial frequency of 54.6lp/mm, the OTF mode values are all above 0.7, at a spatial frequency of 72.8lp/mm, the OTF mode values are all above 0.6, at a spatial frequency of 91.0lp/mm, the OTF mode values are all above 0.6, at a spatial frequency of 109.2lp/mm, the OTF mode values are all above 0.5, at a spatial frequency of 127.4lp/mm, the OTF mode values are all above 0.4, at a spatial frequency of 145.6lp/mm, the OTF mode values are all above 0.4, and at a spatial frequency of 163.8 lp/mm.

In FIG. 3, the spatial frequency ranges from 0 to 182lp/mm, and the OTF mode values are all above 0.3, wherein at a spatial frequency of 18.2lp/mm, the OTF mode values are all above 0.9, at a spatial frequency of 36.4lp/mm, the OTF mode values are all above 0.8, at a spatial frequency of 54.6lp/mm, the OTF mode values are all above 0.7, at a spatial frequency of 72.8lp/mm, the OTF mode values are all above 0.7, at a spatial frequency of 91.0lp/mm, the OTF mode values are all above 0.6, at a spatial frequency of 109.2lp/mm, the OTF mode values are all above 0.6, at a spatial frequency of 127.4lp/mm, at a spatial frequency of 0.5, at a spatial frequency of 145.6lp/mm, the OTF mode values are all above 0.4, and at a spatial frequency of 163.8 lp/mm.

In FIG. 4, the spatial frequency ranges from 0 to 182lp/mm, and the OTF mode values are all above 0.3, where at the spatial frequency of 18.2lp/mm, the OTF mode values are all above 0.9, at the spatial frequency of 36.4lp/mm, the OTF mode values are all above 0.8, at the spatial frequency of 54.6lp/mm, the OTF mode values are all above 0.7, at the spatial frequency of 72.8lp/mm, the OTF mode values are all above 0.6, at the spatial frequency of 91.0lp/mm, the OTF mode values are all above 0.6, at the spatial frequency of 109.2lp/mm, the OTF mode values are all above 0.5, at the spatial frequency of 127.4lp/mm, the OTF mode values are all above 0.4, at the spatial frequency of 145.6lp/mm, the OTF mode values are all above 0.4, and at the spatial frequency of 163.8 lp/mm.

Therefore, the near-eye display detection lens 100 has better imaging contrast, higher resolution and uniform image edge illuminance.

Referring to fig. 5, 6, 7, 8, 9 and 10, fig. 5 discloses a field curve diagram of the near-eye display detection lens 100 imaging an infinitely distant object in an embodiment of the present application, fig. 6 discloses a distortion curve diagram of the near-eye display detection lens 100 imaging an infinitely distant object in an embodiment of the present application, fig. 7 discloses a field curve diagram of the near-eye display detection lens 100 imaging a 2.5m object in an embodiment of the present application, fig. 8 discloses a distortion curve diagram of the near-eye display detection lens 100 imaging a 2.5m object in an embodiment of the present application, fig. 9 discloses a field curve diagram of the near-eye display detection lens 100 imaging a 0.5m object in an embodiment of the present application, and fig. 10 discloses a distortion curve diagram of the near-eye display detection lens 100 imaging a 0.5m object in an embodiment of the present application. Wherein, the curvature of field can represent the crookedness and warpage of the lens imaged surface. The distortion may represent a degree of distortion of the lens imaging picture. In FIG. 5, the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and the curvature of field is controlled to.+ -. 0.04mm, indicating that the curvature of field of the near-eye display detection lens 100 is well corrected. In fig. 6, the horizontal axis represents the degree of distortion (unit: percentage), and the vertical axis represents the angle of view (unit: degree), and the distortion control of the near-eye display detection lens 100 is very small. In FIG. 7, the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and the curvature of field is controlled to.+ -. 0.035mm, indicating that the curvature of field of the near-eye display detection lens 100 is well corrected. In fig. 8, the horizontal axis represents the degree of distortion (unit: percentage), and the vertical axis represents the angle of view (unit: degree), and the distortion control of the near-eye display detection lens 100 is very small. In FIG. 9, the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and the curvature of field is controlled to.+ -. 0.05mm, indicating that the curvature of field of the near-eye display detection lens 100 is well corrected. In fig. 10, the horizontal axis represents the degree of distortion (unit: percentage), and the vertical axis represents the angle of view (unit: degree), and the distortion control of the near-eye display detection lens 100 is very small.

Referring to fig. 11, 12 and 13, fig. 11 discloses a defocus curve of the near-eye display detection lens 100 for imaging an infinitely distant object in an embodiment of the present application, fig. 12 discloses a defocus curve of the near-eye display detection lens 100 for imaging a 2.5m object in an embodiment of the present application, and fig. 13 discloses a defocus curve of the near-eye display detection lens 100 for imaging a 0.5m object in an embodiment of the present application. The horizontal axis is focal shift (unit: mm), the vertical axis is OTF mode value, and the defocus curve can represent focal depth information of the lens system, so that the overall defocus amount in fig. 11, 12 and 13 is smaller, and a reference is provided for adjusting the near-eye display detection lens 100.

Based on the actual imaging quality evaluation parameter information of the embodiment, it is known that the embodiment based on the scheme of the invention has imaging quality far higher than that of the system Nyquist sampling evaluation when imaging an object at infinity/2.5 m/0.5m respectively, and distortion and field curvature are limited to be far less than the range which cannot be perceived by human eyes. Compared with the prior art, the detection precision of the resolution ratio of the AR head-mounted display product can be greatly improved, the working distance range of the detection precision basically covers the virtual image distance of the existing AR head-mounted display product, the detection of AR products of various types can be supported, the assembly debugging sensitivity of the detection system is weaker than the precision commonly used in current production, and the detection system is convenient for mass production flow.

Next, another near-eye display detection lens 100 is described, referring to fig. 14, which discloses a schematic structure of the near-eye display detection lens 100 according to another embodiment of the present application. The near-eye display detection lens 100 may include the stop 10, the first lens group 20, the second lens group 30, the third lens group 40, and the photosensitive assembly 50 in the above-described embodiments. However, at least one of the single lenses 42 may include a third negative lens 422 that receives and transmits light passing through the fourth positive lens 421, in addition to the fourth positive lens 421. Wherein the fourth positive lens 421 and the third negative lens 422 can be used to reduce weight and improve image quality, and further higher optical resolution can be achieved.

In an embodiment, the light receiving surface of the third negative lens 422 facing the fourth positive lens 421 is a convex surface, and the light emitting surface of the third negative lens 422 facing away from the fourth positive lens 421 is a concave surface.

In addition, the effective focal length of each lens group is adjusted, for example:

in an embodiment, the effective focal length f1 of the first lens group 20 is 35mm < f1<40mm.

In one embodiment, the effective focal length f1 may be 35mm, 40mm, or one of 36mm, 37mm, 38mm, 39mm, etc.

In an embodiment, the effective focal length f2 of the second lens group 30 is 90mm < f2<100mm.

In one embodiment, the effective focal length f2 may be 90mm, 100mm, or one of 91mm, 92mm, 93mm, 94mm, 95mm, 96mm, 97mm, 98mm, 99mm, etc.

To further illustrate the imaging effect of the near-eye display detection lens 100 shown in fig. 11, the parameters of the lens according to one embodiment of the present application may be as follows:

In this embodiment, the effective focal length f1 of the first lens group 20 is 37.37784mm, the effective focal length f2 of the second lens group 30 is 93.558mm, and the effective focal length f3 of the third lens group 40 is 52.054mm; the near-eye display detection lens 100 can perform high-quality imaging on an object with infinity to 0.5m, and the rear intercept (the thickness of the 30 th surface in the third negative lens 422) needs to be changed when different shooting distances are needed; the thickness, radius of curvature and material parameters of each element in this example are listed in the table.

Referring to fig. 15, 16 and 17, fig. 15 discloses an MTF (Modulation Transfer Function ) curve of the near-eye display detection lens 100 for imaging an infinitely distant object in another embodiment of the present application, fig. 16 discloses an MTF curve of the near-eye display detection lens 100 for imaging a 2.5m object in another embodiment of the present application, and fig. 17 discloses an MTF curve of the near-eye display detection lens 100 for imaging a 0.5m object in another embodiment of the present application, wherein the MTF can evaluate the ability of the near-eye display detection lens 100 to restore contrast. The vertical axis represents the OTF (Optical Transfer Function ) modulus value, and the horizontal axis represents the spatial frequency.

In fig. 15, the spatial frequency ranges from 0 to 182lp/mm, the OTF mode values are all 0.2 or more, wherein at the spatial frequency of 18.2lp/mm, the OTF mode values are all 0.9 or more, at the spatial frequency of 36.4lp/mm, the OTF mode values are all 0.8 or more, at the spatial frequency of 54.6lp/mm, the OTF mode values are all 0.7 or more, at the spatial frequency of 72.8lp/mm, the OTF mode values are all 0.6 or more, at the spatial frequency of 91.0lp/mm, the OTF mode values are all 0.5 or more, at the spatial frequency of 109.2lp/mm, the OTF mode values are all 0.4 or more, at the spatial frequency of 127.4lp/mm, at the spatial frequency of 145.6lp/mm, the OTF mode values are all 0.3 or more, at the spatial frequency of 163.8lp/mm, and the OTF mode values are all 0.3 or more.

In fig. 16, the spatial frequency ranges from 0 to 182lp/mm, the OTF mode values are all above 0.3, wherein at the spatial frequency of 18.2lp/mm, the OTF mode values are all above 0.9, at the spatial frequency of 36.4lp/mm, the OTF mode values are all above 0.8, at the spatial frequency of 54.6lp/mm, the OTF mode values are all above 0.7, at the spatial frequency of 72.8lp/mm, the OTF mode values are all above 0.7, at the spatial frequency of 91.0lp/mm, the OTF mode values are all above 0.6, at the spatial frequency of 109.2lp/mm, the OTF mode values are all above 0.5, at the spatial frequency of 127.4lp/mm, at the spatial frequency of 145.6lp/mm, the OTF mode values are all above 0.4, at the spatial frequency of 163.8lp/mm, and at the OTF mode values are all above 0.6.

In FIG. 17, the spatial frequency ranges from 0 to 182lp/mm, and the OTF mode values are all above 0.2, where at the spatial frequency of 18.2lp/mm, the OTF mode values are all above 0.9, at the spatial frequency of 36.4lp/mm, the OTF mode values are all above 0.8, at the spatial frequency of 54.6lp/mm, the OTF mode values are all above 0.7, at the spatial frequency of 72.8lp/mm, the OTF mode values are all above 0.6, at the spatial frequency of 91.0lp/mm, the OTF mode values are all above 0.5, at the spatial frequency of 109.2lp/mm, the OTF mode values are all above 0.5, at the spatial frequency of 127.4lp/mm, at the spatial frequency of 0.4, at the spatial frequency of 145.6lp/mm, the OTF mode values are all above 0.3, and at the spatial frequency of 163.8 lp/mm.

Referring to fig. 18, 19, 20, 21, 22 and 23, fig. 18 discloses a field curve diagram of the near-eye display detection lens 100 imaging an infinitely distant object in another embodiment of the present application, fig. 19 discloses a distortion curve diagram of the near-eye display detection lens 100 imaging an infinitely distant object in another embodiment of the present application, fig. 20 discloses a field curve diagram of the near-eye display detection lens 100 imaging a 2.5m object in another embodiment of the present application, fig. 21 discloses a distortion curve diagram of the near-eye display detection lens 100 imaging a 2.5m object in another embodiment of the present application, fig. 22 discloses a field curve diagram of the near-eye display detection lens 100 imaging a 0.5m object in another embodiment of the present application, and fig. 23 discloses a distortion curve diagram of the near-eye display detection lens 100 imaging a 0.5m object in another embodiment of the present application. Wherein, the curvature of field can represent the crookedness and warpage of the lens imaged surface. The distortion may represent a degree of distortion of the lens imaging picture. In FIG. 18, the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and the curvature of field is controlled to be-0.04-0.06 mm, indicating that the curvature of field of the near-eye display detection lens 100 is well corrected. In fig. 19, the horizontal axis represents the degree of distortion (unit: percentage), and the vertical axis represents the angle of view (unit: degree), and the distortion control of the near-eye display detection lens 100 is very small. In FIG. 20, the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and the curvature of field is controlled to be-0.02-0.05 mm, indicating that the curvature of field of the near-eye display detection lens 100 is well corrected. In fig. 21, the horizontal axis represents the degree of distortion (unit: percentage), and the vertical axis represents the angle of view (unit: degree), and the distortion control of the near-eye display detection lens 100 is very small. In FIG. 22, the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and the curvature of field is controlled to be 0 to 0.04mm, indicating that the curvature of field of the near-eye display detection lens 100 is well corrected. In fig. 23, the horizontal axis represents the degree of distortion (unit: percentage), and the vertical axis represents the angle of view (unit: degree), and the distortion control of the near-eye display detection lens 100 is very small.

Referring to fig. 24, 25 and 26, fig. 24 discloses a defocus curve of the near-eye display detection lens 100 for imaging an infinitely distant object in another embodiment of the present application, fig. 25 discloses a defocus curve of the near-eye display detection lens 100 for imaging a 2.5m object in another embodiment of the present application, and fig. 26 discloses a defocus curve of the near-eye display detection lens 100 for imaging a 0.5m object in another embodiment of the present application. The horizontal axis is focal shift (unit: mm), the vertical axis is OTF mode value, and the defocus curve can represent focal depth information of the lens system, so that the overall defocus amount in fig. 24, 25 and 26 is smaller, and a reference is provided for adjusting the near-eye display detection lens 100.

It should be understood that the above-mentioned near-eye display detection lens 100 refers to various single lenses, and if the near-eye display detection lens is manufactured as a near-eye display detection device, a corresponding housing must be designed to mount the near-eye display detection lens 100.

In several embodiments provided herein, it should be understood that the disclosed methods and apparatus may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist alone physically, or two or more units may be integrated into one unit. The integrated units may be implemented in hardware or in software functional units.

The foregoing is only a part of the embodiments of the present application, and is not intended to limit the scope of the present application, and all equivalent devices or equivalent process transformations made by using the descriptions and the contents of the present application, or direct or indirect application to other related technical fields, are included in the scope of patent protection of the present application.

Claims

1. A near-eye display detection lens, characterized by comprising:

a diaphragm for transmitting light;

the second lens group is used for receiving and transmitting the light passing through the first lens group and converging the light, the second lens group comprises a plurality of single lenses and a second double-cemented lens, the single lenses are distributed on two sides of the second double-cemented lens, the single lenses comprise a second positive lens, a first negative lens, a second negative lens and a third positive lens, the second double-cemented lens is positioned between the second positive lens and the first negative lens, the second double-cemented lens comprises a second sub-positive lens and a second sub-negative lens, the light receiving surface of the second positive lens, which sequentially transmits the light, is a convex surface, the second positive lens, which faces one side of the first lens group, is a convex surface, the second positive lens, which faces one side of the second sub-positive lens, is a convex surface, the second sub-negative lens, which faces one side of the second negative lens, is a concave surface, the second negative lens, which faces one side of the second sub-positive lens, the second negative lens, the second positive lens, the second negative lens, the first negative lens, the second negative lens, the third negative lens;

2. The near-eye display detection lens of claim 1, wherein the first lens group further comprises a first positive lens for receiving and transmitting the light rays passing through the first doublet lens.

3. The near-eye display detection lens of claim 2, wherein the first doublet comprises a first sub-negative lens and a first sub-positive lens that sequentially transmit the light rays.

4. The near-to-eye display detection lens of claim 3, wherein the light receiving surface of the first sub-negative lens on the side far from the first sub-positive lens is a concave surface, the light emitting surface of the first sub-positive lens on the side far from the first sub-negative lens is a convex surface, the light receiving surface of the first positive lens on the side toward the first sub-positive lens is a convex surface, and the light emitting surface of the first positive lens on the side far from the first sub-positive lens is a convex surface.

5. The near-eye display detection lens of claim 1, wherein the at least one single lens comprises a fourth positive lens, and the plurality of groups of double cemented lenses comprises a third double cemented lens, a fourth double cemented lens, and a fifth double cemented lens that sequentially transmit the light rays.

6. The near-eye display detection lens of claim 5, wherein the third doublet comprises a third sub-positive lens and a third sub-negative lens that sequentially transmit the light, the fourth doublet comprises a fourth sub-negative lens and a fourth sub-positive lens that sequentially transmit the light, and the fifth doublet comprises a fifth sub-positive lens and a fifth sub-negative lens that sequentially transmit the light.

7. The near-to-eye display detection lens according to claim 6, wherein the light receiving surface of the third sub-positive lens on the side far from the third sub-negative lens is a convex surface, the light emitting surface of the third sub-negative lens on the side far from the third sub-positive lens is a concave surface, the light receiving surface of the fourth sub-negative lens on the side far from the fourth sub-positive lens is a concave surface, the light emitting surface of the fourth sub-positive lens on the side far from the fourth sub-negative lens is a convex surface, the light emitting surface of the fifth sub-positive lens on the side far from the fifth sub-negative lens is a convex surface, the light emitting surface of the fourth positive lens on the side far from the fifth sub-negative lens is a convex surface, and the light emitting surface of the fourth positive lens on the side far from the fifth sub-negative lens is a convex surface.

8. The near-eye display detection lens of claim 5 wherein the at least one single lens further comprises a third negative lens that receives and transmits the light rays passing through the fourth positive lens.

9. The near-eye display detection lens of claim 8, wherein a light receiving surface of the third negative lens facing the fourth positive lens is a convex surface, and a light emitting surface of the third negative lens facing away from the fourth positive lens is a concave surface.

10. The near-eye display detection lens of claim 1, wherein the diaphragm diameter is 3mm-5mm.

11. The near-eye display detection lens of any one of claims 1 to 10, wherein,

40mm<f1<50mm；145mm<f2<152mm；49mm<f3<55mm；

or 35mm < f1<40mm;90mm < f2<100mm;49mm < f3<55mm;

wherein f1 is an effective focal length of the first lens group, f2 is an effective focal length of the second lens group, and f3 is an effective focal length of the third lens group.

12. The near-eye display detection lens according to claim 11, wherein a diagonal direction field angle FOV of the near-eye display detection lens is 58 ° or less and 62 ° or less.

13. The near-eye display detection lens of claim 11, wherein an optical total length TTL of the near-eye display detection lens is TTL less than or equal to 300mm.

14. The near-eye display detection lens of claim 11, wherein a focal length f of the near-eye display detection lens is-15 mm.ltoreq.f.ltoreq.15.15 mm.

15. The near-eye display detection lens according to claim 11, wherein an object distance of the near-eye display detection lens is 0.5m or more.

16. The near-eye display detection lens of claim 11, wherein the photosensitive assembly comprises a photosensitive member having an effective photosensitive area aspect ratio of 16:9, a diagonal dimension of 16.4mm-17mm, and an effective pixel count of 5320H x 3032V.

17. The near-eye display detection lens of claim 11, wherein the photosensitive assembly comprises a photosensitive member having an effective photosensitive area aspect ratio of 3:2, a diagonal dimension of the effective photosensitive area of 15.5mm-16mm, and an effective pixel count of 5472H x 3648V.

18. The near-eye display detection lens of claim 16 or 17, wherein the photosensitive assembly further comprises a glass cover plate covering the effective photosensitive area of the photosensitive member, and the glass cover plate has a thickness ranging from 0.3mm to 0.8mm.

19. A near-eye display device comprising a housing and the near-eye display detection lens of any one of claims 1 to 18, the near-eye display detection lens being mounted on the housing.