CN114706223B - Lens group, optical module and head-mounted display device - Google Patents
Lens group, optical module and head-mounted display device Download PDFInfo
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- CN114706223B CN114706223B CN202210402766.7A CN202210402766A CN114706223B CN 114706223 B CN114706223 B CN 114706223B CN 202210402766 A CN202210402766 A CN 202210402766A CN 114706223 B CN114706223 B CN 114706223B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
Abstract
The application relates to the technical field of near-eye display, in particular to a lens group, an optical module and head-mounted display equipment. The lens group comprises at least two lenses, the at least two lenses comprise a first lens and a second lens, the first lens is a positive focal power lens, the second lens is a negative focal power lens, namely, the lens group is a remote type light group scheme, the product size is reduced, the lens group is simple in structure, and the lens group meets the relation: 16mm < effl <39.4mm,0.65< TL/D <2.8, wherein effl is the effective focal length value of the lens group; TL is the total length of the optical system of the lens group; d is the diameter of the largest lens in the two lenses, and the lens group under the condition of meeting the conditions has the characteristic of small size, so that the single purpose VR system is convenient to manufacture.
Description
Technical Field
The application relates to the technical field of near-eye display, in particular to a lens group, an optical module and head-mounted display equipment.
Background
With the development of computer technology, various wearable device products have been developed, and glasses such as AR (augmented Reality ), VR (Virtual Reality), MR (Mediated Reality), XR (XR) and the like have been attracting attention. The monocular VR system can be applied as a pseudo AR, has good application flexibility, is large in size, and is small in size and good in optical performance, and the monocular VR system is convenient to wear and meets the requirements of users.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present application and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The application mainly aims to provide a lens group, and aims to provide a lens group which is simple in structure, easy to manufacture and low in cost.
In order to achieve the above object, the present application provides a lens group, which includes at least two lenses, wherein at least two lenses include a first lens and a second lens, the first lens is a positive focal power lens, the second lens is a negative focal power lens, and the lens group satisfies the relationship: 16mm < effl <39.4mm,0.65< TL/D <2.8;
wherein, effl is the effective focal length value of the lens group; TL is the total optical system length of the lens group; d is the diameter of the largest lens in the lens group.
Optionally, defining the effective focal length of the first lens as f1 and the effective focal length of the second lens as f2, then: 12mm < f1<32.3mm, -20mm < f2< -29mm.
Optionally, a third lens is further disposed on a side of the second lens facing away from the first lens, where the third lens is a positive focal power lens, and an effective focal length f3 of the third lens is defined, so that the following is satisfied: 100< f3<200mm.
Optionally, the abbe number of the material defining the first lens is V1, the abbe number of the material defining the second lens is V2, and the abbe number of the material defining the third lens is V3, then: v2 < V3, and V2 < V1.
Optionally, the optic diameter of the first lens is greater than the optic diameter of the second lens.
Optionally, the entrance pupil diameter of the lens group is D1, which satisfies the relationship: d1 is more than or equal to 2mm and less than or equal to 6mm.
Optionally, the eyeelief of the lens group is D2, satisfying the relationship 16mm < D2.ltoreq.40 mm.
Optionally, the diagonal field of view of the lens group is FOV, satisfying the relationship 14 ° < FOV <38 °.
The application also provides an optical module, which comprises the lens group of the display screen, wherein the display screen emits light for imaging display to the lens group, and the display screen is arranged on one side of the second lens, which is away from the first lens.
The application also provides a head-mounted display device which comprises a shell and the optical module, wherein the optical module is arranged on the shell.
The application relates to a lens group, which comprises at least two lenses, wherein the at least two lenses comprise a first lens and a second lens, the first lens is a positive focal power lens, the second lens is a negative focal power lens, the lens group adopted by the application is a remote type optical group scheme, and the focal power distribution is required to follow a positive-negative distribution mode, so that an imaging light path is shortened, and the size of the whole lens group is reduced. The lens group satisfies the relationship: 16mm < effl <39.4mm,0.65< TL/D <2.8; wherein, eff is the effective focal length value of the lens group; TL is the total length of the optical system of the lens group; d is the diameter of the largest lens in the lens group, and in the lens group meeting the conditions, the lens group is favorable for realizing the diagonal view field with a small angle, is favorable for forming a smaller volume, is favorable for realizing the entrance pupil diameter with a small size, and can improve the imaging definition of the lens group. That is, in the lens group satisfying the above conditions, the size is small and the imaging is clear. And the lens group has simple structure, is convenient to manufacture, is beneficial to reducing the cost, meets the requirement of low-cost purchase of users, and improves the wide applicability of the lens group.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a lens assembly according to the present application;
FIG. 2 is a schematic view of the optical path of the lens assembly of FIG. 1;
FIG. 3 is a schematic view of another lens assembly according to the present application;
FIG. 4 is a schematic view of the optical path of the lens assembly of FIG. 3;
FIG. 5 is a two-dimensional schematic view of a light emission solid angle of a conventional self-luminous display screen;
FIG. 6 is a graph showing a modulation transfer function according to a first embodiment of the present application;
fig. 7 is a graph showing a modulation transfer function according to a second embodiment of the present application.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Optical module | 2 | Second lens |
| 10 | Display screen | 21 | Third surface |
| 001 | Luminous display screen | 23 | Fourth surface |
| 002 | Central axis | 3 | Third lens |
| 1 | First lens | 31 | Fifth surface |
| 11 | A first surface | 33 | Sixth surface |
| 13 | A second surface |
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
In recent years, the application of augmented Reality (Augmented Reality, AR) technology and Virtual Reality (VR) technology in intelligent wearable electronic devices has rapidly developed, so that the living habits of people are greatly changed, and the cost performance of the intelligent wearable electronic devices becomes a relatively interesting object for adapting to the application of AR technology and VR technology in life. The core components of the enhanced display technology and the virtual display technology are display optical systems, the quality of the intelligent wearable electronic equipment is directly determined by the quality of the display effect of the display optical systems, and meanwhile, the price and the cost are considered, so that the display optical systems have the advantages of simple structure, easy manufacture and low cost, and are the design purpose of research designers.
Particularly, the monocular VR system with small volume can be applied as a pseudo AR, and has wide application, such as information prompt such as monocular head-wearing industrial operation occasion, strong adaptability, and the architecture is divided into an imaging light source and an imaging light path, so as to meet the requirement of low-cost purchase of users, improve the wide applicability, and require the simplicity and convenient manufacture as much as possible in the structural design of the imaging light path.
To this end, as shown in fig. 1 and 2, the present application provides a lens group, which includes at least two lenses, wherein the at least two lenses include a first lens 1 and a second lens 2, the first lens 1 is a positive focal power lens, the second lens 2 is a negative focal power lens, the lens group adopted in the present application is a remote optical group scheme, and the focal power distribution should follow a positive-negative distribution manner, so that the imaging optical path is shortened, which is helpful for downsizing the whole lens group. The lens group satisfies the relationship: 16mm < effl <39.4mm,0.65< TL/D <2.8; wherein, eff is the effective focal length value of the lens group; TL is the total length of the optical system of the lens group; d is the diameter of the largest lens in the lens group, and in the lens group meeting the conditions, the lens group is favorable for realizing the diagonal view field with a small angle, is favorable for forming a smaller volume, is favorable for realizing the entrance pupil diameter with a small size, and can improve the imaging definition of the lens group. That is, in the lens group satisfying the above conditions, the size is small and the imaging is clear. And the lens group has simple structure, is convenient to manufacture, is beneficial to reducing the cost, meets the requirement of low-cost purchase of users, and improves the wide applicability of the lens group.
Further, defining the effective focal length of the first lens 1 as f1 and the effective focal length of the second lens 2 as f2, the following is satisfied: 12mm < f1<32.3mm, -20mm < f2< -29mm. The lens group meeting the effective focal length is beneficial to the design of the small-size lens group.
Further, as shown in fig. 3 and 4, a third lens 3 is further disposed on a side of the second lens 2 facing away from the first lens 1, and the third lens 3 is a positive power lens. The third lens 3 improves the resolution of the lens group, the first lens 1 has positive focal power, the second lens 2 has negative focal power, the third lens 3 has positive focal power, and the combination of the positive and negative focal power improves the resolution. And, defining the third lens 3 to have a fifth surface 31 facing the second lens 2, a sixth surface 33 facing away from the second lens 2, the sixth surface 33 being concave, the fifth surface 31 being convex, reducing tolerance sensitivity of the lens. The high probability of tolerance sensitivity is related to a larger curvature, the larger the curvature is, the more sensitive. Typically a concave or planar surface with a smaller curvature contributes to the reduced sensitivity, i.e. the sixth surface 33 may also be planar, reducing tolerance sensitivity. Defining the effective focal length f3 of the third lens 3, then: 100mm < f3<200mm. The lens group meeting the effective focal length is beneficial to the design of the small-size lens group.
Further, the abbe number of the material defining the first lens 1 is V1, the abbe number of the material defining the second lens 2 is V2, and the abbe number of the material defining the third lens 3 is V3, then: v2 < V3, and V2 < V1. The first lens 1, the second lens 2 and the third lens 3 are made of materials, the Abbe number of the materials is in accordance with a material distribution mode of big-small-big, so as to correct chromatic aberration of an optical path and eliminate chromatic aberration, and when the lens group is applied to the display screen 10 for imaging, light rays emitted from the display screen 10 in all wave bands have good imaging effects.
It can be understood that the first lens 1, the second lens 2 and the third lens 3 are aspheric lenses; the aspheric lens eliminates phase difference and improves imaging quality.
It can be understood that the first lens 1, the second lens 2 and the third lens 3 are made of plastic materials. The plastic material is light and is not easy to damage, the weight of the lens group is lightened, and the wearing is convenient.
Further, as shown in fig. 1, the lens diameter of the first lens 1 is larger than the lens diameter of the second lens 2. Since light is directed from the second lens 2 to the first lens 1, the light diverges from the second lens 2 to the first lens 1, and thus the lens diameter of the first lens 1 is larger than that of the second lens 2.
Further, the entrance pupil diameter of the lens group is D1, satisfying the relationship: d1 is more than or equal to 2mm and less than or equal to 6mm. D1 may be 2mm, 3mm, 4mm, 5mm, 6mm, the smaller the entrance pupil diameter, the more clear the image is seen by the human eye.
Further, the eyeelief of the lens group is D2, and the relation of 16mm < D2 is less than or equal to 40mm. The eyeelief in this range is advantageous for designing small-sized lens groups. D2 is the eye distance Eyerelief of the optical module, D2 may be 16mm, 18mm, 20mm, 25mm, 28mm, 30mm, 35mm, 38mm, 40mm, for example, if the size of the entrance pupil D1 is unchanged from the diagonal field FOV of the lens group, the larger the Eyerelief of the optical module, the smaller the lens diameter of the required first lens 1 will be, so that the optical module with a small size is convenient to design.
Further, the diagonal field of view of the lens group is FOV, satisfying the relationship 14 ° < FOV <38 °. The diagonal view field is similar to a rectangle, and has long sides and short sides, and has a diagonal, and the diagonal view field is the view field with the diagonal length.
The present application further provides an optical module 100, wherein the optical module 100 includes a display screen 10 and a lens group, the display screen 10 emits light for imaging display to the lens group, and the display screen 10 is disposed on a side of the second lens 3 facing away from the first lens 2. The lens group adopts all the technical schemes of all the embodiments, so that the lens group has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
It can be understood that the optical module 100 includes a display screen 10 and a lens group, the display screen 10 is a self-luminous light source, the display screen 10 emits light for imaging display, and the display screen 10 is a self-luminous light source, so that the display screen 10 can be as close to the lens group as possible to reduce the overall volume of the optical system. In addition, the lens group adopted by the application is a remote optical group scheme, and the focal power distribution should follow a positive-negative distribution mode, so that an imaging light path is shortened, and the size of the whole optical module 100 is reduced. The lens group comprises a first lens 1 and a second lens 2, the second lens 2 is arranged in the light emitting direction of the display screen 10, the second lens 2 is provided with a fourth surface 23 facing the display screen 10 and a third surface 21 facing away from the display screen 10, at least one of the fourth surface 23 and the third surface 21 is concave, the first lens 1 is arranged on one side of the second lens 2 facing away from the display screen 10, the first lens 1 is provided with a second surface 13 facing the second lens 2 and a first surface 11 facing away from the second lens 2, the second surface 13 is convex, and the first surface 11 is convex, so that the optical power distribution follows a positive-negative distribution mode.
In an embodiment, the eye distance Eyerelief of the optical module 100 is D2, the relation 16mm < D2 is less than or equal to 40mm, the diagonal field of view of the lens group is FOV, the relation 14 ° < FOV <38 °, the diagonal field of view is FOV within the range, which is conducive to the optical module 100 forming a smaller volume, the beam aperture D1 of the incident beam of the lens group entering the imaging region, D1 is the entrance pupil diameter of the optical module, and the relation 2mm is less than or equal to D1 is less than or equal to 6mm. Wherein the relationship satisfied by the entrance pupil diameter D1 improves the definition of the imaging of the optical module 100, and the entrance pupil diameter is in this range advantageous for optimally setting the maximum diameter of the lens. The optical module 100 has a small size and a clear image, and the pupil diameter, the eyerelif, and the diagonal field of view of the lens assembly are matched.
Further, D2 is the eye distance Eyerelief of the optical module, and D2 may be 16mm, 18mm, 20mm, 25mm, 28mm, 30mm, 35mm, 38mm, or 40mm, for example, if the size of the entrance pupil D1 is unchanged from the diagonal field FOV of the lens group, the larger the Eyerelief of the optical module, the smaller the lens diameter of the first lens 1 is required, so that the small-sized optical module 100 is conveniently designed.
The diagonal field of view of the lens group is FOV satisfying the relation 14 ° < FOV <38 °, wherein the diagonal field of view is like a rectangle with long sides and short sides and a diagonal, and the diagonal field of view is the field of view of the diagonal length.
D1 is the entrance pupil diameter of the optical module, the relation of 2mm is less than or equal to D1 and less than or equal to 6mm is met, D1 can be 2mm, 3mm, 4mm, 5mm and 6mm, and the smaller the entrance pupil diameter is, the clearer the image seen by human eyes is.
In addition, the optical module 100 only needs two lenses and one display screen 10, has a simple structure, is convenient to manufacture, and is beneficial to reducing the cost, so that the requirement of low-cost purchase of users is met, and the wide applicability of the optical module is improved. The entrance pupil diameter, the eyerelif of the optical module 100, and the diagonal field of view of the lens group are related to each other under the condition of meeting the requirement of small size, for example, if the entrance pupil diameter size and the diagonal field of view of the lens group are unchanged, the larger the eyerelif of the optical module 100 is, the lens diameter of the required first lens 1 may be reduced, for example, the eyerelif may be D2>30mm, which is favorable for reducing the lens diameter of the first lens 1, and in order to comprehensively consider the small size and the imaging quality of the optical module 100, the above parameters are adopted to optimize the performance of the optical module 100.
As shown in fig. 1 and 3, the optical total length of the optical module 100 is defined as TL, the first lens 1 is the largest lens, the lens diameter of the first lens 1 is D, and the optical total length and the lens diameter of the first lens 1 satisfy: TL/D is more than 0.65 and less than 2.8mm. The diagonal field of view of the lens group and the eyerelif of the optical module are satisfied by designing the total optical length and the lens diameter of the first lens 1 within the above-described range, 14 ° < FOV <38 °,16mm < D2+.ltoreq.40 mm, thus realizing the small size of the optical module 100.
Defining the total effective focal length of the lens group as effl, 16mm < effl <39.4mm is satisfied. The total effective focal length is within this range, which facilitates the design of the small-sized optical module 100. It can be understood that the effective focal length=half image height/tan diagonal half field of the display screen, when designing the optical module, the diagonal field FOV and the size of the display screen are selected to be certain, the effective focal length can be calculated, the lens is designed according to the effective focal length and the required entrance pupil diameter, and the lens diameter size is approximately equal to (eye distance) tan (FOV) +entrance pupil diameter.
Defining the TV distortion of the lens group as TVD, then |tvd| < 1% is satisfied. That is, by the arrangement of the lens group, TV distortion of less than 1% can be achieved, and distortion refers to aberration of different magnification of different parts of an object when the object is imaged by an image display structure, and distortion causes deterioration of similarity of an object image, but does not affect definition of the image. TV distortion is less than 1%, distortion is small, and design rules are met.
As shown in fig. 3 and 4, the lens group further includes a third lens 3, where the third lens 3 is disposed on a side of the second lens 2 facing the display screen 10, and the third lens 3 has a sixth surface 33 facing the display screen 10 and a fifth surface 31 facing away from the display screen 10, and at least one of the sixth surface 33 and the fifth surface 31 is convex. The third lens 3 improves the resolution of the optical module 100, the second lens 2 has negative focal power, the third lens 3 has positive focal power, and the combination of the positive and negative focal powers improves the resolution. The sixth surface 33 is concave, and the fifth surface 31 is convex, reducing tolerance sensitivity of the lens. The high probability of tolerance sensitivity is related to a larger curvature, the larger the curvature is, the more sensitive. Typically a concave or planar surface with a smaller curvature contributes to the reduced sensitivity, i.e. the sixth surface 33 may also be planar, reducing tolerance sensitivity.
Defining the abbe number of the material of the first lens 1 as V1, the abbe number of the material of the second lens 2 as V2, and the abbe number of the material of the third lens 3 as V3, the following is satisfied: v2 < V3, and V2 < V1. The abbe numbers of the first lens 1, the second lens 2 and the third lens 3 follow the material distribution mode of big-small-big so as to correct the chromatic aberration of the light path and eliminate the chromatic aberration, so that the light rays emitted by the display screen 10 in the whole wave band have good imaging effect.
The second lens 2, the first lens 1 and the third lens 3 are aspheric lenses; the aspheric lens eliminates phase difference and improves imaging quality.
The second lens 2, the first lens 1 and the third lens 3 are made of plastic materials. The plastic material is light and is not easy to damage, the weight of the optical module 100 is reduced, and the wearing is convenient.
And, defining the effective focal length of the first lens 1 as f1, the effective focal length of the second lens 2 as f2, and the effective focal length f3 of the third lens 3, then: 12mm < f1<32.3mm, -20mm < f2< -29mm,100mm < f3<200mm; the three lenses meeting the effective focal length are beneficial to the design of the small-size optical module.
The display screen 10 is defined to emit light for imaging display as visible light having a wavelength in the range of 400nm to 700nm. The optical module 100 of the present application eliminates chromatic aberration, so that the optical module is suitable for the display screen 10 emitting colored light, and imaging effect is improved.
Further, in a first embodiment of the present application, as shown in table one, the performance and parameters of the optical module of this embodiment are shown. The second surface 13 and the first surface 11 of the first lens 1 are convex, the fourth surface 23 and the third surface 21 of the second lens 2 are concave, the sixth surface 33 of the third lens 3 is concave, and the fifth surface 31 is convex; the effective focal length of the first lens 1 is f1=19.12 mm, the effective focal length of the second lens 2 is f2= -26.223mm, and the effective focal length of the third lens 3 is f3= 169.445mm; the total effective focal length of the lens group is effl= 29.43mm; the optical total length of the optical module is tl=33.5 mm; the entrance pupil diameter of the optical module is d1=5mm; the included angle between the central axis of the lighting angle of the display screen 10 and the principal ray is smaller than 2 degrees, the size of the display screen 10 used is 10.85mm by 6.16mm, and the wavelength of light emitted by the display screen 10 is that the visible light full-wave short full-field MTF is more than 0.4@45lp/mm.
List one
| Performance of | Parameters (parameters) |
| Entrance pupil diameter | 5mm |
| EFFL | 29.4mm |
| Display screen size | 10.85mm*6.16mm |
| Display screen luminescence wavelength | Full band of visible light |
| TV distortion | <1％ |
| Full field of view MTF | ＞0.4@45lp/mm |
| Telecentric angle | <2° |
| Number of lenses | 3P |
As shown in fig. 5, the current display optical system needs to satisfy the requirements of small volume, high Light efficiency and uniform brightness of the image, and referring to fig. 5, most of the display screens 10 adopted by the current display optical system are self-luminous display screens 001, such as liquid crystal displays (Liquid Crystal Display, LCDs) and Organic Light-emitting diodes (OLEDs), the central axis 002 of the Light-emitting solid angle a of the self-luminous display screens 001 is perpendicular to the surface of the self-luminous display screens 001, and the different Light-emitting intensities of the Light-emitting angles are different, that is, the farther from the central axis 002, the smaller the Light-emitting intensity is. In the application, the included angle between the central axis of the lighting angle of the display screen 10 and the principal ray is smaller than 2 degrees, so that the light-emitting intensity of the optical module 100 is better, and the brightness of the picture is uniform.
As shown in fig. 6, which is a graph of modulation transfer function of the present embodiment, namely, MTFModulation Transfer Function graph, the MTF graph is used to refer to the relationship between the modulation degree and the logarithm of lines per millimeter in the image, and is used to evaluate the reduction capability of detail of the scene; the MTF value of each view field is higher than 0.4, and the image definition after being imaged by the system under each view field can be better.
Specifically, by way of example, the parameters of the three lenses are shown in Table two below.
Watch II
Further, the second embodiment of the present application, as shown in table three, is the performance and parameters of the optical module of this embodiment. The second surface 13 and the first surface 11 of the first lens 1 are convex, the fourth surface 23 and the third surface 21 of the second lens 2 are concave, the sixth surface 33 of the third lens 3 is concave, and the fifth surface 31 is convex; the effective focal length of the first lens 1 is f1=20.3 mm, the effective focal length of the second lens 2 is f2= -29.3mm, and the effective focal length of the third lens 3 is f3=199.7 mm; the total effective focal length of the lens group is effl=18.92 mm; the optical total length of the optical module is tl=29.71 mm; the entrance pupil diameter of the optical module is d1=4mm; the angle between the central axis of the lighting angle of the display screen 10 and the chief ray is less than 2 deg.. The display 10 used was 7.68mm by 4.32mm in size, and the wavelength of light emitted by the display 10 was visible full wave short full field MTF > 0.3@45lp/mm.
Watch III
As shown in fig. 5, the current display optical system needs to satisfy the requirements of small volume, high Light efficiency and uniform brightness of the image, and referring to fig. 5, most of the display screens 10 adopted by the current display optical system are self-luminous display screens 001, such as liquid crystal displays (Liquid Crystal Display, LCDs) and Organic Light-emitting diodes (OLEDs), the central axis 002 of the Light-emitting solid angle a of the self-luminous display screens 001 is perpendicular to the surface of the self-luminous display screens 001, and the different Light-emitting intensities of the Light-emitting angles are different, that is, the farther from the central axis 002, the smaller the Light-emitting intensity is. In the application, the included angle between the central axis of the lighting angle of the display screen 10 and the principal ray is smaller than 2 degrees, so that the light-emitting intensity of the optical module 100 is better, and the brightness of the picture is uniform.
As shown in fig. 7, which is a graph of modulation transfer function of the present embodiment, namely, MTFModulation Transfer Function graph, the MTF graph is used to refer to the relationship between the modulation degree and the logarithm of lines per millimeter in the image, and is used to evaluate the reduction capability of detail of the scene; the MTF value of each view field is higher than 0.3, and the image definition after being imaged by the system under each view field can be better.
Specifically, by way of illustration, the parameters of the three lenses are shown in Table four below.
Table four
The application also provides a head-mounted display device, which comprises a shell and an optical module 100, wherein the optical module 100 is arranged on the shell. The optical module 100 is disposed in the housing, which can effectively protect the optical module 100 from dust falling into the optical module 100, and can reduce moisture infiltration into the optical module 100 to avoid malfunction of the optical module 100. Since the optical module 100 adopts all the technical solutions of all the embodiments, at least the technical solutions of the embodiments have all the beneficial effects brought by the technical solutions of the embodiments, and are not described in detail herein.
The foregoing description of the preferred embodiments of the present application should not be construed as limiting the scope of the application, but rather as utilizing equivalent structural changes made in the description of the application and the accompanying drawings, or as directly/indirectly employed in other related technical fields, are included in the scope of the application.
Claims (8)
1. A lens group, characterized in that the lens group is composed of a first lens, a second lens and a third lens, the first lens is a positive focal power lens, the second lens is a negative focal power lens, and the lens group satisfies the relationship: 16mm < effl <39.4mm,0.65< TL/D <2.8;
wherein, effl is the effective focal length value of the lens group; TL is the total optical system length of the lens group; d is the diameter of the largest lens in the lens group;
defining the effective focal length of the first lens as f1 and the effective focal length of the second lens as f2, the following are satisfied: 12mm < f1<32.3mm, -20mm < f2< -29mm;
the second lens is far away from the first lens, the third lens is arranged on one side of the second lens, the third lens is a positive focal power lens, and the effective focal length f3 of the third lens is defined, so that the following conditions are satisfied: 100mm < f3<200mm.
2. The lens group of claim 1, wherein the abbe number of the material defining the first lens is V1, the abbe number of the material defining the second lens is V2, and the abbe number of the material defining the third lens is V3, then: v2 < V3, and V2 < V1.
3. The lens group of claim 1 wherein the optic diameter of the first lens is greater than the optic diameter of the second lens.
4. A lens group according to any one of claims 1 to 3, wherein the entrance pupil diameter of the lens group is D1, satisfying the relationship: d1 is more than or equal to 2mm and less than or equal to 6mm.
5. A lens group according to any one of claims 1 to 3, wherein the lens group' eyeelief is D2, satisfying the relationship 16mm < D2 +.40 mm.
6. A lens group according to any of claims 1 to 3, wherein the diagonal field of view of the lens group is FOV satisfying the relationship 14 ° < FOV <38 °.
7. An optical module comprising a display screen and a lens assembly according to any one of claims 1 to 6, the display screen emitting light for imaging display to the lens assembly, the display screen being provided on a side of the second lens facing away from the first lens.
8. A head-mounted display device, comprising a housing and the optical module of claim 7, wherein the optical module is disposed on the housing.
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| CN202210402766.7A CN114706223B (en) | 2022-04-15 | 2022-04-15 | Lens group, optical module and head-mounted display device |
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| CN202210402766.7A CN114706223B (en) | 2022-04-15 | 2022-04-15 | Lens group, optical module and head-mounted display device |
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