CN115268085A - Eyepiece optical system and head-mounted display device - Google Patents
Eyepiece optical system and head-mounted display device Download PDFInfo
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- CN115268085A CN115268085A CN202211177633.0A CN202211177633A CN115268085A CN 115268085 A CN115268085 A CN 115268085A CN 202211177633 A CN202211177633 A CN 202211177633A CN 115268085 A CN115268085 A CN 115268085A
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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
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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
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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
- G02B13/004—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 four 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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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Abstract
The invention discloses an eyepiece optical system and a head-mounted display device, wherein the eyepiece optical system sequentially comprises a display unit, a first lens, a second lens, a third lens and a fourth lens from a display side to an eye side along a light transmission direction; the display unit is used for providing an image light source for the eyepiece optical system; the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface; the second lens has negative focal power, and the display side surface of the second lens is a concave surface; the third lens element has a positive optical power, a concave ocular side surface at the paraxial region, and a convex display side surface; the fourth lens has positive focal powerThe eye side surface is convex at the position close to the optical axis, and the display side surface is convex; air space CT between the first lens and the display unit on the optical axis W And (4) dynamic adjustability. The eyepiece optical system provided by the invention has the advantages of short total length, light weight, small distortion and adjustable diopter, so that users with different diopter degrees can wear the eyepiece optical system with good sensory experience.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an eyepiece optical system and a head-mounted display device.
Background
With the development of virtual reality technology, the forms and the types of Virtual Reality (VR) devices are increasingly diversified, the application fields are increasingly wide, and the head-mounted display device is popular among consumers due to the characteristics of small size, light weight and the like. The head-mounted display device transmits video image light emitted by the display to pupils of a user through an optical technology, realizes virtual and enlarged images in the near-eye range of the user, provides visual and visible images and video information for the user, and an eyepiece optical system is the core of the head-mounted display device and realizes the function of displaying the images on the display in front of human eyes to form virtual enlarged images.
In order to provide excellent sensory experience for users, an eyepiece optical system needs to have a larger field angle, a longer eye distance and higher-quality imaging, and meanwhile, in order to meet users with different myopia or hyperopia degrees, the eyepiece optical system also needs to have diopter adjustability.
Disclosure of Invention
Based on this, the invention aims to provide an eyepiece optical system and a head-mounted display device, which have at least the advantages of large field angle, total length and adjustable diopter and can bring excellent sensory experience to users.
The embodiment of the invention achieves the aim through the following technical scheme.
In one aspect, an embodiment of the present invention provides an eyepiece optical system, configured to allow imaging light to enter an eye of a user from a display unit through the eyepiece optical system for imaging, where a direction toward the eye of the user is a target side, and a direction toward the display unit is a display side, and the eyepiece optical system sequentially includes, from the display side to the target side, a display unit, a first lens, a second lens, a third lens, and a fourth lens along a light transmission direction; the first lens, the second lens, the third lens and the fourth lens respectively comprise an eye side surface and a display side surface;
the display unit is used for providing an image light source for the eyepiece optical system;
the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface;
the second lens has negative focal power, and the display side surface of the second lens is a concave surface;
the third lens element has a positive optical power, the eye side surface of the third lens element is concave at the paraxial region, and the display side surface of the third lens element is convex;
the fourth lens element has a positive optical power, the eye side surface of the fourth lens element is convex at the paraxial region, and the display side surface of the fourth lens element is convex;
an air space CT between the first lens and the display unit on the optical axis W The dynamic adjustment is realized;
wherein at least one of the first lens, the second lens, the third lens, and the fourth lens is a glass lens.
In another aspect, the present invention also provides a head-mounted display apparatus including the eyepiece optical system as described above, the eyepiece optical system being located between a user's eye and the display unit.
Compared with the prior art, the eyepiece optical system and the head-mounted display device provided by the invention have the advantages that four lenses with specific refractive power are adopted, the structure is more compact while small distortion is met through specific surface shape collocation, meanwhile, the wide-field-of-view display effect can be provided through a larger field angle, the immersion feeling of a user is improved, and therefore, better experience feeling is brought to the user. The air spacing distance between the lens group in the lens system and the display unit on the optical axis is adjusted, so that different diopters can be adjusted, and the wearing requirements of users with different vision are met; simultaneously eyepiece optical system still has great exit pupil distance, can bring splendid sense organ experience for the user.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of an eyepiece optical system 100 provided in a first embodiment of the present invention at diopter 0D;
fig. 2 shows a field curvature graph of the eyepiece optical system 100 provided by the first embodiment of the present invention at diopter 0D;
fig. 3 shows a distortion curve of the eyepiece optical system 100 provided by the first embodiment of the present invention at diopter 0D;
fig. 4 is a graph showing a vertical axis chromatic aberration of the eyepiece optical system 100 provided by the first embodiment of the present invention at diopter 0D;
fig. 5 is a schematic structural diagram of an eyepiece optical system 200 provided in a second embodiment of the present invention at diopter 0D;
fig. 6 shows a field curvature graph of an eyepiece optical system 200 provided by a second embodiment of the present invention at diopter 0D;
fig. 7 shows a distortion curve of the eyepiece optical system 200 at diopter 0D provided by the second embodiment of the present invention;
fig. 8 is a graph showing the vertical axis chromatic aberration of the eyepiece optical system 200 provided by the second embodiment of the present invention at diopter 0D;
fig. 9 is a schematic structural view of an eyepiece optical system 300 provided in a third embodiment of the present invention at diopter 0D;
fig. 10 shows a field curvature plot at diopter 0D for an eyepiece optical system 300 provided by a third embodiment of the present invention;
fig. 11 shows a distortion curve of an eyepiece optical system 300 provided by the third embodiment of the present invention at diopter 0D;
fig. 12 is a graph showing a vertical axis chromatic aberration of an eyepiece optical system 300 provided by a third embodiment of the present invention at diopter 0D;
fig. 13 shows a schematic diagram of an optical path in the head mounted display apparatus provided in the fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
In this context, the paraxial region means the region near the optical axis. If the lens surface is convex and the convex position is not defined, the lens surface is convex at least in the near-optical axis region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.
The embodiment of the invention provides an eyepiece optical system, which is used for imaging light entering eyes of a user from a display unit through the eyepiece optical system, wherein the direction facing the eyes of the user is an eye side, the direction facing the display unit is a display side, and the eyepiece optical system sequentially comprises the display unit, a first lens, a second lens, a third lens and a fourth lens from the display side to the eye side along the light transmission direction; the first lens, the second lens, the third lens and the fourth lens respectively comprise a eye side surface and a display side surface;
the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface;
the second lens has negative focal power, and the display side surface of the second lens is a concave surface;
the third lens element has a positive optical power, the eye side surface of the third lens element is concave at the paraxial region, and the display side surface of the third lens element is convex;
the fourth lens has positive optical power, the eye side surface of the fourth lens is convex at a paraxial region, and the display side surface of the fourth lens is convex;
an air space CT between the first lens and the display unit on the optical axis W The dynamic is adjustable, through adjusting the display element with the air interval between first, second, third, four lens groups can realize that eyepiece optical system's diopter is adjustable to can satisfy the user demand of different near-sighted or far-sighted degree.
At least one of the first lens, the second lens, the third lens and the fourth lens is a glass lens, aberration of the system can be better corrected by the glass lens, and resolving power of the eyepiece optical system is improved.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
4<TTL/CT W <15；（1）
wherein TTL represents the total optical length of the eyepiece optical system, CT W Representing an air space of the first lens on an optical axis with the display unit. Satisfy conditional expression (1), can make eyepiece optical system realize the regulation of different diopters, satisfy different eyesight users' and wear the demand, simultaneously can reasonable control eyepiece optical system makes it have shorter optics total length.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
1.0<ED/f <1.5；（2）
where f denotes an effective focal length of the eyepiece optical system, and ED denotes an exit pupil distance of the eyepiece optical system. And the condition formula (2) is satisfied, the eyepiece optical system can have a larger exit pupil distance, and an image picture sent by the display unit can be full of the visual field of human eyes, so that immersive experience is brought to a user, and the total optical length of the eyepiece optical system can be shortened.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
1<f/f12<2；（3）
-2<f/f1+f/f2<-0.2；（4）
where f denotes an effective focal length of the eyepiece optical system, f1 denotes an effective focal length of the first lens, f2 denotes an effective focal length of the second lens, and f12 denotes a combined focal length of the first lens and the second lens. The optical system meets the conditional expressions (3) and (4), and is beneficial to correcting the aberration of the optical system in different diopters by reasonably controlling the focal lengths of the first lens and the second lens, so that the imaging quality of the eyepiece optical system is improved.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
-3<f/f2<-1；（5）
0.1<R S3 /f<1；（6）
wherein f denotes an effective focal length of the eyepiece optical system, f2 denotes an effective focal length of the second lens, and R S3 Represents a radius of curvature of the display side of the second lens. Satisfy conditional expressions (5) and (6), the focus and the face type that can reasonable control second lens make the second lens have suitable negative focal length, are favorable to proofreading and correct high-order aberration, improve eyepiece optical system's imaging quality.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.5<f3/f4<5；（7）
where f3 denotes an effective focal length of the third lens, and f4 denotes an effective focal length of the fourth lens. And the condition formula (7) is met, the focal lengths of the third lens and the fourth lens can be reasonably distributed, and the eyepiece optical system has higher imaging quality under different diopters.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
2<R S8 /CT4<3；（8）
wherein R is S8 Represents the curvature of the eye side surface of the fourth lensRadius, CT4, represents the center thickness of the fourth lens. The optical lens meets the conditional expression (8), so that the light has a smaller angle when the light is emitted to the eye side surface of the fourth lens, the light condensing intensity of the optical axis is favorably alleviated, the aberration of the edge field and the central field is reduced, and the resolution capability of the optical lens in the full field is improved.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.4<DM4/f4<0.7；（9）
where DM4 represents an effective half aperture of the fourth lens, and f4 represents an effective focal length of the fourth lens. And the conditional expression (9) is satisfied, the caliber of the fourth lens can be reasonably controlled, the reduction of the volume of the eyepiece optical system is facilitated, and the miniaturization of the eyepiece optical system is realized.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.5<f/f4<2；（10）
-1<R S8 /R S7 <0；（11）
wherein f denotes an effective focal length of the eyepiece optical system, f4 denotes an effective focal length of the fourth lens, and R S7 Represents a radius of curvature, R, of a display side surface of the fourth lens S8 Represents a radius of curvature of the eye-side surface of the fourth lens. Satisfy conditional expression (10) and (11), the focus and the face type that can reasonable control fourth lens slow down the tortuosity of light, are favorable to rectifying eyepiece optical system's optical distortion is favorable to reducing the bore of follow-up lens simultaneously, realizes eyepiece optical system's miniaturization.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
-4D≤P≤5D；（12）
wherein P represents a diopter of the eyepiece optical system. The condition formula (12) is met, and the eyepiece optical system can realize diopters of-4D to-5D, so that users with different myopia or hyperopia degrees can wear the eyepiece optical system with good sensory experience. When light is incident from an object to another substance having a different optical density, the propagation direction of the light is deflected, which is called refraction, and the unit representing the size (refractive power) of the refraction is diopter (abbreviated as "D"). 1 diopter or 1D equals 100 degrees, commonly spoken.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0<(SAG2-SAG1)/f1<0.1；（13）
-20<(R S2 +R S1 )/(R S2 -R S1 )<-1；（14）
wherein f1 represents the effective focal length of the first lens, SAG1 represents the saggital height of the display side of the first lens, SAG2 represents the saggital height of the eye side of the first lens, and R S1 Represents a radius of curvature, R, of a display side surface of the first lens S2 Represents a radius of curvature of the eye-side surface of the first lens. The surface shape of the first lens can be reasonably controlled by satisfying the conditional expressions (13) and (14), which is beneficial to correcting the distortion of the off-axis field of view and improving the resolution quality of the eyepiece optical system.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.3<CT2/CT3<0.7；（15）
0.15<CT4/TTL<0.25；（16）
wherein CT2 denotes a center thickness of the second lens, CT3 denotes a center thickness of the third lens, CT4 denotes a center thickness of the fourth lens, and TTL denotes a total optical length of the eyepiece optical system. The central thicknesses of the second lens, the third lens and the fourth lens can be reasonably distributed according to the conditional expressions (15) and (16), so that the structure of the eyepiece optical lens is more compact, and the total length of the eyepiece optical lens can be shortened.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
20<V2<25； （17）
1.6<N2<1.7；（18）
55<V3<57；（19）
1.5<N3<1.6； （20）
wherein V2 denotes an abbe number of the second lens, V3 denotes an abbe number of the third lens, N2 denotes a refractive index of the second lens, and N3 denotes a refractive index of the third lens. Satisfy conditional expression (17) to (20), the material of selecting second lens and third lens of can reasonable collocation is favorable to proofreading and correct eyepiece optical system's colour difference improves optical system's imaging quality.
In one embodiment, the first lens, the second lens, the third lens and the fourth lens may be spherical lenses or aspherical lenses; preferably, first lens are glass sphere lens, and second lens, third lens, fourth lens all adopt plastic aspheric lens, moulds the reasonable collocation of mixing the lens through adopting the glass, under the prerequisite that reduces lens quantity, can better guarantee optical system's imaging quality, shorten whole optical system's overall length, better realize the miniaturization of camera lens and the equilibrium of high image quality.
As an embodiment, when the lens surface in the eyepiece optical system is an aspherical surface, each aspherical surface shape of the eyepiece optical system may satisfy the following equation:
wherein z is the distance rise from the aspheric surface vertex at the position of height h along the optical axis direction, c is the paraxial curvature radius of the surface, and k is the conic coefficient, A 2i Is the aspheric surface type coefficient of 2i order.
The invention is further illustrated below in the following examples. In the following embodiments, the thickness, the radius of curvature, and the material selection of each lens in the eyepiece optical system are different, and specific differences can be referred to in the parameter tables of the embodiments.
First embodiment
As shown in fig. 1, for a schematic structural diagram of an eyepiece optical system 100 provided by an embodiment of the present invention, a direction toward an eye 20 of a user is a target side, a direction toward a display unit 10 is a display side, and image information emitted from the display unit 10 enters the eye 20 of the user through the lens group 30 to be imaged; specifically, the eyepiece optical system 100 includes a display unit 10, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence along a light transmission direction from a display side to an eye side, where the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 each include an eye side surface and a display side surface; the first lens element L1 is a glass spherical lens element, and the second lens element L2, the third lens element L3 and the fourth lens element L4 are plastic aspheric lens elements.
Specifically, the first lens L1 has positive focal power, the eye side surface S2 of the first lens is a convex surface, and the display side surface S1 of the first lens is a concave surface;
the second lens L2 has negative focal power, the eye side surface S4 of the second lens is a convex surface, and the display side surface S3 of the second lens is a concave surface;
the third lens element L3 has a positive optical power, the ocular side S6 of the third lens element is concave at the paraxial region, and the display side S5 of the third lens element is convex;
the fourth lens element L4 has positive optical power, with its ocular side surface S8 being convex at the paraxial region and its display side surface S7 being convex.
Referring to table 1, table 1 shows the parameters related to each lens of the eyepiece optical system 100 according to the first embodiment of the present invention.
TABLE 1
The aspherical surface type coefficients of the aspherical lens in the eyepiece optical system 100 provided in the present embodiment are shown in table 2.
TABLE 2
To meet the wearing requirements of users with different diopters, the first lens L1 and the display unit 10 can be dynamically adjustedAir space on optical axis CT W To achieve adjustment of the eyepiece optics between different diopters, in particular, the air space CT in this embodiment W The adjusting range of the optical lens is 2.334 to 5.306mm, and diopter of-400 to 500 degrees can be adjusted, so that the optical lens has good sensory experience when worn by users with different myopia or hypermetropia degrees. As shown in FIG. 1, the eyepiece optical system 100 is schematically configured at diopter 0D (0 °) when the entire lens group 30 composed of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 and the air space CT of the display unit 10 on the optical axis W 3.984mm; when the air space on the optical axis of the entire lens group 30 and the display unit 10 is 5.306mm, the diopter of the eyepiece optical system 100 at this time is-4D (-400 °); when the air space on the optical axis of the entire lens group 30 and the display unit 10 is 2.334mm, the diopter of the eyepiece optical system 100 at this time is 5D (500 °); air space CT of the entire lens group 30 and the display unit 10 on the optical axis W The adjustable lens can be dynamically adjusted between 2.334-5.306mm, so that the wearing requirements of users with different refractive degrees can be well met.
Referring to fig. 2, a field curvature graph of the eyepiece optical system 100 is shown, in which the horizontal axis represents an offset (unit: mm) and the vertical axis represents an image height (unit: mm) received by the eye of the user, and it can be seen that the meridional field curvature and the sagittal field curvature of different wavelengths are within ± 0.1mm, which indicates that the field curvature of the eyepiece optical system 100 is well corrected.
Referring to fig. 3, a distortion graph of the eyepiece optical system 100 is shown, in which the horizontal axis represents the distortion percentage and the vertical axis represents the image height (unit: mm) received by the user's eye, and it can be seen that the optical distortion at different image heights is controlled within ± 2%, which indicates that the distortion of the eyepiece optical system 100 is well corrected.
Referring to fig. 4, a vertical axis chromatic aberration graph of the eyepiece optical system 100 is shown, in which the horizontal axis represents the vertical axis chromatic aberration value (unit: micrometer) of each wavelength with respect to the central wavelength (0.54 micrometer), and the vertical axis represents the image height received by the eyes of the normalized user, and it can be seen from the graph that the vertical axis chromatic aberration between each wavelength is controlled within ± 8 micrometers, which indicates that the eyepiece optical system 100 can effectively correct the aberration of the peripheral field of view and the secondary spectrum of the whole image plane.
Second embodiment
Referring to fig. 5, a schematic diagram of an eyepiece optical system 200 according to a second embodiment of the present invention is shown, where the eyepiece optical system 200 according to the second embodiment of the present invention has substantially the same structure as the eyepiece optical system 100 according to the first embodiment, and mainly includes differences in curvature radius, material selection, and lens thickness of each lens, and an air interval CT on an optical axis between the entire lens group 30 and the display unit 10 W The adjusting range is 1.7-4.653mm, and the diopter of the eyepiece optical system 200 at-400-500 degrees can be adjusted.
Referring to table 3, parameters related to each lens of the eyepiece optical system 200 according to the second embodiment of the present invention are shown.
TABLE 3
The aspherical surface type coefficients of the aspherical lens in the eyepiece optical system 200 provided by the embodiment of the present invention are shown in table 4.
TABLE 4
Referring to fig. 6, a field curvature graph of the eyepiece optical system 200 is shown, and it can be seen that the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.2mm, which indicates that the field curvature of the eyepiece optical system 200 is well corrected.
Referring to fig. 7, a distortion curve diagram of the eyepiece optical system 200 is shown, from which it can be seen that the optical distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the eyepiece optical system 200 is well corrected.
Referring to fig. 8, a vertical axis chromatic aberration graph of the eyepiece optical system 200 is shown, from which it can be seen that the vertical axis chromatic aberration between the wavelengths is controlled within ± 8 μm, which indicates that the eyepiece optical system 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Third embodiment
Referring to fig. 9, a schematic diagram of an eyepiece optical system 300 according to a third embodiment of the present invention is shown, the eyepiece optical system 300 according to the third embodiment of the present invention has substantially the same structure as the eyepiece optical system 100 according to the first embodiment, and mainly includes a concave ocular surface S4 of the second lens, different curvature radii, material choices and lens thicknesses of the lenses, and an air gap CT on an optical axis between the entire lens assembly 30 and the display unit 10 W The adjusting range is 1.7 to 4.682mm, and the diopter of the eyepiece optical system 300 can be adjusted within-400 to 500 degrees.
Referring to table 5, parameters related to each lens of the eyepiece optical system 300 according to the third embodiment of the present invention are shown.
TABLE 5
The aspherical surface type coefficients of the aspherical lens in the eyepiece optical system 300 according to the embodiment of the present invention are shown in table 6.
TABLE 6
Referring to fig. 10, a field curvature graph of the eyepiece optical system 300 is shown, and it can be seen that, under different diopters, the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.2mm, which indicates that the field curvature of the eyepiece optical system 300 is well corrected.
Referring to fig. 11, a distortion curve diagram of the eyepiece optical system 300 is shown, from which it can be seen that, under different diopters, the optical distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the eyepiece optical system 300 is well corrected.
Referring to fig. 12, a vertical axis chromatic aberration graph of the eyepiece optical system 300 is shown, and it can be seen that the vertical axis chromatic aberration between the wavelengths is controlled within ± 10 um under different diopters, which shows that the eyepiece optical system 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Please refer to table 7, which shows the optical characteristics corresponding to the eyepiece optical systems provided in the above three embodiments, mainly including the effective focal length f, the exit pupil distance ED, the entrance pupil diameter EPD, the total optical length TTL, the maximum image height IH of the user's eye viewing the image plane, and the like of the eyepiece optical system, and the related values corresponding to each of the above conditional expressions.
TABLE 7
In summary, the eyepiece optical system provided by the embodiment of the invention has the following advantages:
(1) The four lenses with specific refractive power are adopted, and glass-plastic mixing and specific surface shape matching of each lens are adopted, so that the optical system has shorter optical total length, the total length of the whole head-mounted display equipment system is shortened, and the miniaturization and light weight of the head-mounted display equipment are facilitated to be realized; the optical distortion of the whole eyepiece optical system is within +/-2%, which shows that the optical system has very small optical distortion and basically very small image distortion or deformation degree, thereby bringing better sensory experience to users.
(2) The air space between the whole lens group and the display unit on the optical axis is adjusted, so that the adjustment of different diopters (400-500 degrees) can be realized, the optical system has higher imaging quality under different diopters, and the wearing requirements of users with different myopia or hyperopia degrees can be met;
(3) Because the focal power and the surface type of each lens are reasonably arranged, the optical system has a larger field angle and a larger exit pupil distance, and can provide better experience for users.
Fourth embodiment
The fourth embodiment of the present invention provides a head-mounted display device 400, where the head-mounted display device 400 includes an eyepiece optical system (e.g., eyepiece optical system 100) in any of the above embodiments, the eyepiece optical system 100 is located between the user's eye 20 and the display unit 10, preferably, the display unit 10 may be one of Micro LED, OLED, LCD, LCOS, and M-OLED, and in this embodiment, the display unit 10 may employ a 0.39 inch M-OLED display screen with a resolution of 1080P, which can provide high-definition image picture information for the eyepiece optical system 100. Referring to fig. 13, which is a schematic diagram of an optical path in the head-mounted display apparatus 400, image information emitted from the display unit 10 enters the user's eye 20 through the lens group 30 in the eyepiece optical system to be imaged, and a virtual image with high definition magnification can be observed in the user's eye, so that the user has a very realistic sensory experience.
The head-mounted display device 400 provided by the embodiment comprises the eyepiece optical system, and the eyepiece optical system has the advantages of short total length, light weight, small distortion and adjustable diopter, so that the head-mounted display device 400 with the eyepiece optical system also has the advantages of miniaturization, light weight, high resolving power and adjustable diopter, and users with different diopters can wear the head-mounted display device with good sensory experience.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. An eyepiece optical system is used for imaging light entering eyes of a user from a display unit through the eyepiece optical system, the direction facing the eyes of the user is a target side, and the direction facing the display unit is a display side, and the eyepiece optical system is characterized by sequentially comprising the display unit, a first lens, a second lens, a third lens and a fourth lens from the display side to the target side along the light transmission direction; the first lens, the second lens, the third lens and the fourth lens respectively comprise a eye side surface and a display side surface;
the display unit is used for providing an image light source for the eyepiece optical system;
the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface;
the second lens has negative focal power, and the display side surface of the second lens is a concave surface;
the third lens element has a positive optical power, the eye side surface of the third lens element is concave at the paraxial region, and the display side surface of the third lens element is convex;
the fourth lens element has a positive optical power, the eye side surface of the fourth lens element is convex at the paraxial region, and the display side surface of the fourth lens element is convex;
the air interval CT between the first lens and the display unit on the optical axis W The dynamic adjustment is realized;
wherein at least one of the first lens, the second lens, the third lens and the fourth lens is a glass lens.
2. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
4<TTL/CT W <15；
wherein TTL represents the total optical length of the eyepiece optical system, CT W Representing an air space of the first lens on an optical axis with the display unit.
3. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
1.0<ED/f <1.5；
where f represents an effective focal length of the eyepiece optical system, and ED represents an exit pupil distance of the eyepiece optical system.
4. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
1<f/f12<2；
-2<f/f1+f/f2<-0.2；
where f denotes an effective focal length of the eyepiece optical system, f1 denotes an effective focal length of the first lens, f2 denotes an effective focal length of the second lens, and f12 denotes a combined focal length of the first lens and the second lens.
5. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
-3<f/f2<-1；
0.1<R S3 /f<1；
wherein f denotes an effective focal length of the eyepiece optical system, f2 denotes an effective focal length of the second lens, and R S3 Represents a radius of curvature of the display side of the second lens.
6. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
0.5<f3/f4<5；
wherein f3 represents an effective focal length of the third lens, and f4 represents an effective focal length of the fourth lens.
7. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
2<R S8 /CT4<3；
wherein R is S8 Represents a radius of curvature of a ocular surface of the fourth lens, and CT4 represents a center thickness of the fourth lens.
8. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
0.4<DM4/f4<0.7；
where DM4 represents an effective half aperture of the fourth lens, and f4 represents an effective focal length of the fourth lens.
9. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
0.5<f/f4<2；
-1<R S8 /R S7 <0；
wherein f denotes an effective focal length of the eyepiece optical system, f4 denotes an effective focal length of the fourth lens, and R S7 Represents a radius of curvature, R, of a display side surface of the fourth lens S8 Represents a radius of curvature of the eye-side surface of the fourth lens.
10. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
-4D≤P≤5D；
wherein P represents a diopter of the eyepiece optical system.
11. A head-mounted display device characterized in that it comprises an eyepiece optical system as claimed in any one of claims 1-10, which eyepiece optical system is located between a user's eye and the display unit.
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| JP2010175673A (en) * | 2009-01-28 | 2010-08-12 | Nikon Vision Co Ltd | Eyepiece and optical device |
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| CN113504654A (en) * | 2021-08-04 | 2021-10-15 | 北京灵犀微光科技有限公司 | Near-to-eye display optical system |
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| JP2010175673A (en) * | 2009-01-28 | 2010-08-12 | Nikon Vision Co Ltd | Eyepiece and optical device |
| CN107884924A (en) * | 2012-10-04 | 2018-04-06 | 株式会社尼康 | Eyepiece optical system and Optical devices |
| CN105319700A (en) * | 2014-06-11 | 2016-02-10 | 富士胶片株式会社 | Eyepiece lens and imaging apparatus |
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