CN107024766B - The eyepiece optical system and head-wearing display device of the high image quality of big field angle - Google Patents
The eyepiece optical system and head-wearing display device of the high image quality of big field angle Download PDFInfo
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- CN107024766B CN107024766B CN201610074756.XA CN201610074756A CN107024766B CN 107024766 B CN107024766 B CN 107024766B CN 201610074756 A CN201610074756 A CN 201610074756A CN 107024766 B CN107024766 B CN 107024766B
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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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- 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 present invention relates to the eyepiece optical systems and head-wearing display device of the high image quality of big field angle, wherein the eyepiece optical system of the high image quality of big field angle includes and meeting certain focal length relationship along coaxial the first lens group and the second lens group being arranged successively of optical axis direction from human eye to image source.It is made of the first lens close to human eye and the second lens far from human eye, is made of a piece of or two panels lens.First lens are biconvex shape, and second concaves towards human eye direction close to the optical surface of human eye thoroughly, and is aspherical face type.The focal length relationship of eyeglass, the material property of each eyeglass meet certain relationship in interval, the second lens group between first lens and the second lens, and the second lens group also includes the 4th lens and the 5th lens being provided separately.Eyepiece optical system of the invention has many advantages, such as large aperture, big visual field, high-resolution, low distortion, small size, is suitable for head-mounted display and similar device.
Description
Technical field
The present invention relates to optical technical field more particularly to a kind of big visual fields suitable for head-mounted display or similar device
The eyepiece optical system and head-wearing display device of the high image quality in angle.
Background technique
As electronic device is constantly to ultraminiaturization development and new computer, microelectronics, photoelectric device and communication reason
By the development with technology, this new ant algorithms based on " people-oriented " " people computer system " of wearable computing have become possibility.
Application is continued to bring out in fields such as military, industry, medical treatment, education, consumption.In a typical wearable computing system framework
In, head-mounted display apparatus is crucial component part.Head-wearing display device is by optical technology, by miniature image display
The video image light that (such as transmission-type or Reflective liquid crystal displays screen, organic electroluminescence device, DMD device) issues is directed to
The pupil of user realizes virtual, enlarged drawing in the nearly mesh range of user, for user provide intuitive, visual image,
Video, text information.Eyepiece optical system is the core of head-wearing display device, and realization shows miniature image to be formed before human eye
The function of virtual enlarged drawing.
Head-wearing display device is towards volume compact, and light-weight, convenient for wearing, the directions such as mitigation load are developed.Meanwhile big view
Rink corner and euphorosia experience are increasingly becoming the key factor for measuring head-wearing display device superiority and inferiority, and big field angle determines that height faces
The visual experience effect of field sense, high image quality, low distort determine the comfort level of visual experience.Meet these requirements, needs eyepiece
Optical system realizes the indexs such as big field angle, hi-vision resolving power, low distortion, the small curvature of field, small size as much as possible, meets simultaneously
Above-mentioned optical property is very big challenge to design and the aberration optimization of system.
The combination of three pieces axicon (referred to as " positive the negative and positive ") composition for being respectively provided with positive focal length, negative focal length and positive focal length is common
Eyepiece optical system, many documents are based on the structure and propose respective design.1 (China Patent Publication No. of patent document
CN101887166B), patent document 2 (China Patent Publication No. CN103217782A), 3 (China Patent Publication No. of patent document
CN104730706A), patent document 4 (China Patent Publication No. CN103988111A), 5 (China Patent Publication No. of patent document
CN104685402A), patent document 6 (China Patent Publication No. CN104603669A), 7 (U.S. Patent Publication No. of patent document
US7978417B2), patent document 8 (U.S. Patent Publication No. US8345139B2) provides saturating using coaxial positive negative and positive three pieces respectively
The eyepiece optical system of mirror morphosis realizes the effect of low distortion (< 3%), high image quality.But above-mentioned eyepiece system is effective
Field angle is smaller, respectively from 16 °~37 °, is not carried out big field angle effect.
Patent document 9 (U.S. Patent Publication No. US5815317A) provide it is a kind of for wearing the eyepiece system of display,
It is made of monolithic positive lens, double glued negative lenses, monolithic positive lens, the optical texture of positive negative and positive can be regarded as on the whole, the eyepiece
System can be realized the effect (> 50 °) of big field angle, but the aberrations such as its curvature of field and astigmatism residual is larger, and peripheral field image quality is difficult
To realize high-resolution optical effect, it is unfavorable for comfortable visual experience for a long time.
The positive and negative optical texture as another coaxial three pieces lens is applied to eyepiece, it can be achieved that biggish field angle
Optical system.Patent document 10 (China Patent Publication No. CN104635333A), which is mentioned, has supplied a kind of eyepiece using positive and negative structure
Optical system, it can be achieved that big field angle (> 50 °) optical effect, but the outer coma of axis of the eyepiece system is larger, at the same remain compared with
Big color difference reduces the optical resolution of the outer visual field of axis, is unfavorable for comfortable visual experience.
Patent document 11 (China Patent Publication No. CN104536130A) provides a kind of eyepiece optical system, just positive and negative
The 4th lens that joined positive light coke on the basis of the optical texture of coaxial three pieces lens constitute the optics knot of positive negative and positive
Structure；Patent document 12 (U.S. Patent Publication No. US5877900A) provides a kind of eyepiece optical system, from eye-observation side to
Miniature image display device lateral edge optical axis direction is coaxial to be arranged successively monolithic positive lens, monolithic positive lens, double glued negative lenses, list
Piece positive lens is seen constitute the optical texture of positive negative and positive on the whole.Eyepiece optical system described in above-mentioned two documents all may be used
It realizes the optical effect of big field angle (> 50 °), while there are the optical indexes such as better axis outer coma, system color difference, but the curvature of field
There is residual with aberrations such as astigmatisms, leading to the image quality of central vision and peripheral field, there are notable differences, more arrive edge more visual field light
Credit resolution is lower, the high-resolution optical effect being not carried out within the scope of silent frame.
Patent document 13 (China Patent Publication No. CN104570323A) provides a kind of eyepiece optical system, sees from human eye
Side is examined to bear thoroughly to coaxial monolithic positive lens, monolithic positive lens, the monolithic of being arranged successively of miniature image display device lateral edge optical axis direction
Mirror, monolithic negative lens, constitute positive and negative negative optical texture, which can realize the optical effect (> 70 at ultra-large vision field angle
Degree), but its distortion is excessive (> 25%), and image is caused to show more serious distortion.
Patent document 14 (U.S. Patent Publication No. US2014/0218806A1) provides a kind of for wearing the mesh of display
Mirror system is arranged successively positive lens groups and negative lens from eye-observation side to miniature image display device lateral edge optical axis direction is coaxial
Group, positive lens groups are made of 2~3 positive lens, and negative lens group is by positive and negative cemented doublet or positive and negative cemented doublet and list
Piece bent moon positive lens are constituted, and foundation structure can regard the optical texture of positive and negative (double gluings) of being positive as, are further preferably designed
Using positive and negative (double gluings) positive optical texture.The eyepiece optical system, by increasing number of lenses (5 or more),
It realizes big field angle (> 50 °) and corrects optical system residual aberration, but lens number of packages is excessive, increases the overall dimensions of product
And weight, it is unfavorable for comfortably dressing experience, and lens face type is complicated, is unfavorable for producing in batches.
Patent document 15 (China Patent Publication No. CN101609208B) provides a kind of for wearing the eyepiece system of display
System, from eye-observation side to miniature image display device lateral edge optical axis direction, coaxial to be arranged successively monolithic positive lens, monolithic just saturating
Mirror, positive and negative double glued negative lenses, monolithic positive lens, single element lens, have equally constituted more complicated optical texture, it can be achieved that big
The optical effect (> 50 degree) of field angle, but all there is biggish astigmatism in above-mentioned eyepiece optical system, while application multi-disc lens are former
Part constitutes optical system (being greater than 5), causes the overall dimensions of optical system and weight excessive, is unfavorable for comfortably dressing body
It tests.
Patent document 16 (China Patent Publication No. CN104965306A) provides a kind of big field angle eyepiece optical system,
It is disclosed that being arranged successively the first lens, second from eye-observation side to miniature image display device lateral edge optical axis direction is coaxial
Lens, the third lens.The optical effect (> 75 degree) at ultra-large vision field angle, but its peripheral field may be implemented in the eyepiece optical system
Picture quality relative to central vision is declined, and silent frame image quality is not uniform enough, meanwhile, it needs larger using refractive index
Optical material, in existing known optical material, the material of high refractive index cause product manufacturing cost and weight increase,
Promote the manufacture difficulty of respective optical element.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, it is high to provide a kind of big field angle
The eyepiece optical system and head-wearing display device of image quality.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of eyepiece optical system of high image quality of big field angle is constructed, including from eye-observation side to miniature image display
Coaxial the first lens group and the second lens group being arranged successively of part lateral edge optical axis direction, and the effective focal length of first lens group
For f1, the effective focal length of second lens group is f2f2For positive value, the effective focal length of the eyepiece optical system is fw, meet
Following relationship (1) and (2):
|f1/fw|>0.85 (1)；
0.4<f2/fw<1.6 (2)；
Wherein: first lens group is made of two panels lens, is proximate to the first lens of human eye side respectively and far from people
Second lens of eye side, and first lens are the positive lens of biconvex shape, second lens are negative lenses；Described second
Optical surface of the lens close to human eye side concaves towards human eye side, and radius of curvature is negative value；
Second lens group is made of one or more pieces lens, wherein second lens set includes at least and described the
The third lens of one lens group neighbour, the third lens are positive lens；
First lens, second lens and the third lens material property meet following relationship (11),
(12) and (13):
1.50<Nd11<1.82 (11)；
1.55<Nd12<1.75 (12)；
1.50<Nd23<1.78 (13)；
Wherein, above-mentioned Nd11、Nd12、Nd23Respectively described first lens, second lens and the third lens are in d
The refractive index of line；
First lens, second lens and the third lens material property also meet following relationship (21),
(22) and (23):
35<Vd11<60 (21)；
21<Vd12<35 (22)；
35<Vd23<60 (23)；
Wherein, above-mentioned Vd11、Vd12、Vd23Respectively described first lens, second lens and the third lens are in d
The Abbe number of line；
Second lens group further includes the 4th lens and the 5th lens, and the third lens, the 4th lens and the 5th lens are pressed
It is arranged successively from human eye side to miniscope side；Meanwhile the 4th lens and the 5th lens are provided separately, and third
The effective focal length f of lens23With the effective focal length f of the second lens group2Meet following relational expression (8):
0.85≤f23/f2≤1.55 (8)。
Eyepiece optical system of the present invention, wherein the effective focal length f of second lens group2, the third lens have
Imitate focal length f23, meet following relationship (5):
1.12≤f23/f2≤1.37 (5)。
Eyepiece optical system of the present invention, wherein optical surface of second lens close to human eye side is aspheric
Face, and the radius of curvature of two optical surfaces of second lens meets following relationship (3):
-2.6<(R21+R22)/(R21-R22)<-0.5 (3)；
Wherein, R21It is second lens close to human eye side surface radius of curvature, R22It is second lens close to image source
Side surface radius of curvature.
Eyepiece optical system of the present invention, wherein between the first lens and the second lens of first lens group
Distance meet following relationship (4):
0.06<D12/fw<0.30 (4)；
Wherein, D12For along the first lens described in optical axis direction close to image source side optical surface center and second lens
Optical surface centre distance close to human eye side.
Eyepiece optical system of the present invention, wherein the effective focal length f of first lens group1, the second lens group
Effective focal length f2And the effective focal length f of eyepiece optical systemwMeet following relational expression (1b), (2b):
-7.8<f1/fw<-1.6 (1b)；
0.48<f2/fw<0.68 (2b)。
Eyepiece optical system of the present invention, wherein the radius of curvature of second lens meets following relationship
(3a):
-1.6<(R21+R22)/(R21-R22)<-1.1 (3a)；
Wherein, R21It is second lens close to human eye side surface radius of curvature, R22It is second lens close to image source
Side surface radius of curvature.
Eyepiece optical system of the present invention, wherein first lens of first lens group and described second
The distance between lens meet following relationship (4a):
0.14<D12/fw<0.27 (4a)；
Wherein, D12For along the first lens of optical axis direction close to image source side optical surface center and the second lens close to human eye
The optical surface centre distance of side.
Eyepiece optical system of the present invention, wherein first lens, second lens, the third lens,
4th lens and the 5th lens are glass material or plastic material.
Eyepiece optical system of the present invention, wherein first lens, second lens, the third lens,
One or more of 4th lens and the 5th lens are axisymmetric aspheric surface lens.
The present invention also provides a kind of head-wearing display device, including miniature image display and eyepiece, the eyepiece is located at
Between human eye and the miniature image display, in which: the eyepiece is aforementioned described in any item eyepiece optical systems.
Head-wearing display device of the present invention, wherein the miniature image display is organic electroluminescent photophore
Part or transmissive type liquid crystal display.
Head-wearing display device of the present invention, wherein the head-wearing display device includes two identical and arranged symmetrically
The eyepiece optical system.
The beneficial effects of the present invention are: eyepiece optical system has compact-sized, small size, big visual field, bloom credit
The advantages that resolution, exit pupil diameter are greater than primitive eyepiece.The optical system of the eyepiece can use spherical lens and non-spherical lens
Collocation uses, optical plastic and optical glass are applied in combination, and then on the benchmark for reducing manufacturing cost and product weight, realizes
The substantially elimination of system aberration, especially while realizing the optics such as big field angle, low distortion, low aberration, low field song, low astigmatism
Index, be observer can the eyepiece optical system through the invention, watch that silent frame high definition, undistorted, image quality is uniform
Substantially picture, reach the visual experience of high telepresenc.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the light channel structure schematic diagram of the eyepiece optical system of the 1st embodiment of the invention；
Fig. 2 is the point range figure schematic diagram of the 1st embodiment eyepiece optical system of the invention；
Fig. 3 (a) is the field curve schematic diagram of the 1st embodiment eyepiece optical system of the invention, and Fig. 3 (b) is the present invention the 1st
The distortion curve schematic diagram of the eyepiece optical system of embodiment；
Fig. 4 is the light channel structure schematic diagram of the eyepiece optical system of the 2nd embodiment of the invention；
Fig. 5 is the point range figure schematic diagram of the 2nd embodiment eyepiece optical system of the invention；
Fig. 6 (a) is the field curve schematic diagram of the 2nd embodiment eyepiece optical system of the invention, and Fig. 6 (b) is the present invention the 2nd
The distortion curve schematic diagram of the eyepiece optical system of embodiment；
Fig. 7 is the light channel structure schematic diagram of the eyepiece optical system of the 3rd embodiment of the invention；
Fig. 8 is the point range figure schematic diagram of the 3rd embodiment eyepiece optical system of the invention；
Fig. 9 (a) is the field curve schematic diagram of the 3rd embodiment eyepiece optical system of the invention, and Fig. 9 (b) is the present invention the 3rd
The distortion curve schematic diagram of the eyepiece optical system of embodiment；
Figure 10 is the head-wearing display device structural schematic diagram using eyepiece optical system of the invention.
Specific embodiment
The eyepiece optical system structure of the high image quality of big field angle of the invention as shown in Figure 1, include from eye-observation side to
Coaxial the first lens group and the second lens group being arranged successively of miniature image display device lateral edge optical axis direction, and the first lens group
Effective focal length be f1, f1For negative value, the effective focal length of the second lens group is f2, f2For positive value, effective coke of eyepiece optical system
Away from for fw, meet following relationship (1) and (2):
|f1/fw|>0.85 (1)；
0.4<f2/fw<1.6 (2)；
Wherein: the first lens group is made of two panels lens, is proximate to the first lens of human eye side respectively and far from human eye side
The second lens, and the first lens are the positive lens of biconvex shape, and the second lens are negative lenses；Second lens are close to human eye side
Optical surface concaves towards human eye side, and radius of curvature is negative value；Second lens group is made of one or more pieces lens, wherein the second eyeglass
Group includes at least the third lens with the first lens group neighbour, and the third lens are positive lens；First lens, the second lens and third
Lens material characteristic meets following relationship (11), (12) and (13):
1.50<Nd11<1.82 (11)；
1.55<Nd12<1.75 (12)；
1.50<Nd23<1.78 (13)；
Wherein, Nd11、Nd12、Nd23The refractive index of respectively the first lens, the second lens and the third lens in d line；First
Lens, the second lens and the third lens material property meet formula (21), (22) and (23):
35<Vd11<60 (21)；
21<Vd12<35 (22)；
35<Vd23<60 (23)；
Wherein, Vd11、Vd12、Vd23The Abbe number of respectively the first lens, the second lens and the third lens in d line；
Second lens group further includes the 4th lens and the 5th lens, and the third lens, the 4th lens and the 5th lens are pressed from people
Eye side is arranged successively to miniscope side；Meanwhile the 4th lens and the 5th lens be provided separately, and effective coke of the third lens
Away from f23With the effective focal length f of the second lens group2Meet following relational expression (8):
0.85≤f23/f2≤1.55 (8)。
In the above-described embodiments, the first lens group fully corrects the aberration of system by the combination of positive negative lens, mentions
The optical resolution of system is risen.Wherein, it is concaved towards by using the first lens combination of biconvex faces close to the surface of human eye side
Second lens of human eye, efficiently reduce the overall dimensions of eyepiece optical system.Moreover, the second lens group can provide it is enough
Positive light coke, to guarantee that eyepiece optical system can realize sufficiently large field angle.
Importantly, being 1.50 < Nd by using the refractive index in d line on the basis of features described above23< 1.78
The third lens effectively improve existing that is, using combining compared with the third lens of low-refraction with the positive negative lens of the first lens group
There is the defect of technology, big field angle, low distortion, high optical resolution is realized, to reduce the manufacture of the optical system
Difficulty, manufacturing cost and product weight greatly improve the user experience of product；And by the combination to material dispersion coefficient,
The color difference for improving optical system improves the optical property of system.
In addition, f in above-mentioned relation formula (8)23/f2Lower limit value be greater than 0.85, to reduce the processing system of the third lens
Difficulty and the requirement to material high refractive index are made, value range is conducive to system and realizes telecentric beam path in image space less than 1.55.
Meanwhile the 4th lens and the 5th lens of positive light coke are added, it is advantageously implemented bigger field angle and higher
Optical resolution.The value of relational expression (5) is more than or equal to 1.12, to reduce the processing and manufacturing difficulty of the third lens and to material
The requirement of high refractive index, value are less than or equal to 1.37, are conducive to system and realize image space telecentricity.Moreover, because the 4th lens and
5th lens are provided separately, and expand the second lens group to the degree of correction of system aberration, it can be ensured that system color difference is filled
While branch school is positive, the spherical aberration and coma of system is further corrected, while to realize high optical property, is greatly reduced first
The processing and manufacturing difficulty of lens, the second lens and the third lens advantageously reduces manufacturing cost and realizes stabilization production.
In above-described embodiment, Nd11It can be 1.50,1.52,1.57,1.62,1.70,1.73,1.79,1.80,1.82 etc..
Nd12It can be 1.55,1.58,1.62,1.65,1.66,1.68,1.70,1.73,1.75 etc..
Nd23It can be 1.50,1.52,1.57,1.60,1.63,1.65,1.70,1.73,1.78 etc..
Vd11It can be 35,36.2,37.4,38.1,40.3,46.8,57.4,60 etc..
Vd12It can be 21,26.2,27.4,28.5,30.3,32.8,33.4,35 etc..
Vd13It can be 35,36.2,37.4,38.1,40.3,46.8,57.4,60 etc..
Further, the 4th lens are between the third lens and miniature image display device, second lens
The effective focal length f of group2, the effective focal length f of the third lens23, meet following relationship (5):
1.12≤f23/f2≤1.37 (5)；
Wherein, f23/f2Value can be 1.12,1.2,1.3,1.37 etc..f24/f2Value can be 3.5,3.6,
3.7,3.8,4.7,5.8,6.9,12.5 etc..
On that basi of the above embodiments, it is preferable that the effective focal length f of the first lens group1, the effective focal length of the second lens group
f2And the effective focal length f of eyepiece optical systemwMeet following relational expression (1a), (2a):
-20.78<f1/fw<-1 (1a)；
0.3<f2/fw< 0.526 or 0.700 < f2/fw<0.8 (2a)。
Wherein, f1/fwValue can be -20.78, -19.22, -18.74, -12.4, -10.56, -5, -6.6, -
3.43, -2, -1 etc..f2/fwValue can be 0.3,0.4,0.51,0.526,0.7,0.75,0.78,0.8 etc..
F in above-mentioned relation formula (1a), (2a)1/fwAnd f2/fwValue range to the correction of system aberration, optical element
The sensitivity of difficulty of processing and optical element assembling deviation is closely related, f in relational expression (1a)1/fwValue be greater than-
20.78, so that system aberration is sufficiently corrected, to realize good optical effect, value is less than -1, improves the system
The machinability of optical element in system；F in relational expression (2a)2/fwValue is greater than 0.3, improves optical element in the system
Machinability, value enables system aberration sufficiently to correct less than 0.8, to realize more good optical effect.
On that basi of the above embodiments, it is further preferred that the effective focal length f1 of the first lens group, the second lens group have
Imitate focal length f2And the effective focal length f of eyepiece optical systemwMeet relational expression (1b), (2b):
-7.8<f1/fw<-1.6 (1b)；
0.48<f2/fw<0.68 (2b)。
Pass through further preferred first lens group, the value range of the second lens group and system effective focal length, more preferable Horizon
The optical property and processing and manufacturing difficulty for the optical system that weighed.
In a further embodiment, in above-mentioned eyepiece optical system: optical surface of second lens close to human eye side is
It is aspherical, the distortion of system is corrected well, and the radius of curvature of two optical surfaces of the second lens meets following relationship
(3):
-2.6<(R21+R22)/(R21-R22)<-0.5 (3)；
Wherein, R21It is the second lens close to human eye side surface radius of curvature, R22It is the second lens close to image source side surface song
Rate radius.
Wherein (R in relational expression (3)21+R22)/(R21-R22) lower limit value condition be greater than -2.6, make the second lens can be with
Enough negative powers are provided, so as to which correction system aberration is better balanced, realize good optical effect, value is small
In -0.5, the correction difficulty of spherical aberration is reduced, big optical aperture is easy to implement.
Wherein (R21+R22)/(R21-R22) value can be -2.6, -1.8, -1.2, -1, -0.8, -0.6, -0.5 etc..
Preferably, the radius of curvature of above-mentioned second lens meets following relationship (3a):
-1.6<(R21+R22)/(R21-R22)<-1.1 (3a)。
Relational expression (3a) is to (R in relational expression (3)21+R22)/(R21-R22) value range it is further preferred so that
While the aberrations at different levels of optical system obtain good optimization, in turn ensure that the second lens have good manufacturing.
Further, the distance between the first lens and the second lens of the first lens group meet relational expression (4):
0.06<D12/fw<0.30 (4)；
Wherein, D12For along the first lens of optical axis direction close to image source side optical surface center and the second lens close to human eye
The optical surface centre distance of side.
D in above-mentioned relation formula (4)12/fwLower limit value be greater than 0.06, reduce the correction difficulty of system off-axis aberration,
Ensure central vision and peripheral field while reaching higher picture quality, keeps image quality in silent frame uniform, value is less than
0.3, convenient for reducing overall length of system, be conducive to the miniaturization of product.
Wherein D12/fwValue can be 0.06,0.08,0.1,0.14,0.15,0.18,0.20,0.24,0.26,0.30 etc.
Deng.
Preferably, the distance between the first lens and the second lens of the first lens group meet relational expression (4a):
0.14<D12/fw<0.27 (4a)。
Relational expression (4a) is to D in relational expression (4)12/fwRange it is further preferred, be conducive to preferably optimize at different levels
Aberration, while realizing the miniaturization of optical system total length.
The aberrations such as astigmatism and the curvature of field of system are further improved, is conducive to eyepiece system and realizes the uniform image quality of silent frame
High-resolution optical effect.
In a further embodiment, the material property of the 4th lens meets (71) and (72) claimed below:
1.50<Nd24<1.75 (71)；
40<Vd24<65 (72)；
Wherein, Nd24For the 4th lens d line refractive index；Vd24For the 4th lens d line Abbe number.
Preferably, the material property of above-mentioned 4th lens meets (71a) and (72a) claimed below:
1.6<Nd24<1.65 (71a)；
50<Vd24<61 (72a)；
Wherein, Nd24Refractive index for the 4th lens in d line, Vd24For the 4th lens d line Abbe number.
For example, Nd24It can be 1.50,1.52,1.54,1.60,1.62,1.65,1.70,1.75.Vd24Can be 40,
44、47、50、51、52、61、65。
In a further embodiment, the first lens, the second lens, the third lens, the 4th lens and the 5th lens are glass
Glass material or plastic material.
While so that the aberrations at different levels of the eyepiece optical system are sufficiently corrected, and control the system of optical element
Cause the weight of this and optical system.
In a further embodiment, the optics of the first lens, the second lens, the third lens, the 4th lens, the 5th lens
Face is all axisymmetric aspheric surface.Aspherical expression formula is formula (a):
Wherein, z is the rise of optical surface, and c is aspherical apex curvature, and k is asphericity coefficient, and α 2,4,6 ... is each rank
Coefficient, r are to put to lens system optical axis on curved surface apart from coordinate.
Make the aberration (including spherical aberration, coma, distortion, the curvature of field, astigmatism, color difference and other higher order aberratons) of the optical system
It is adequately corrected, is conducive to the eyepiece optical system while realizing big field angle, large aperture, further in promotion
Heart visual field and the picture quality of peripheral field, the difference for reducing central vision and peripheral field picture quality, are realized in silent frame
Picture quality and low distortion more evenly.
In a further embodiment, in the first lens, the second lens, the third lens, the 4th lens and the 5th lens
One or more is axisymmetric aspheric surface lens, plurality of to refer to two, three, four or five.It can make the optics
The aberrations at different levels of system obtain further optimizing correction.Further promote the optical property of the eyepiece optical system.
The principle of above-mentioned eyepiece optical system, scheme and display result are carried out more below by more specifical embodiment
It is further elucidated above.
In following embodiment, it is a virtual light hole diameter that diaphragm E, which can be the emergent pupil of eyepiece optical system imaging,
The pupil of human eye is at stop position, it can be observed that optimal imaging effect.
[embodiment 1]
As shown in Fig. 1, the light channel structure schematic diagram of the eyepiece optical system of the 1st embodiment of the invention, from eye-observation
Side to the side display device I (from left to right) is followed successively by diaphragm E, the first lens group G1, the second lens group G2 and display device I.Its
In, the first lens group G1 is made of the first lens L1 and the second lens L2, and the second lens group G2 is by the third lens L3, the 4th lens
L4 and the 5th lens L5 is constituted.In the present invention, diaphragm E can be the emergent pupil of eyepiece optical system imaging, be one virtual
Light hole diameter, the pupil of human eye is at stop position, it can be observed that optimal imaging effect.In the present embodiment, first thoroughly
Mirror L1 is positive lens, and the second lens L2 is negative lens, the first lens group G1 with negative power is constituted, wherein the first lens L1
For the face type of biconvex shape, the optical surface of the second lens L2 towards human eye side concaves towards human eye direction, and for the first lens L1 and
Second lens L2 is all even aspheric surface face type, with aberrations such as the distortion, color difference and the curvature of field that adequately correct system.
Second lens group G2 described in the present embodiment is made of the third lens L3, the 4th lens L4 and the 5th lens L5,
Middle the third lens L3 is positive lens, the 4th lens L4 is positive lens, the 5th lens L5 is negative lens, fully to correct system picture
Difference, and the first lens L1, the second lens L2, the third lens L3 are all even aspheric surface face type, to provide enough positive light
Focal power realizes big field angle.Here, with close to the optical surface serial number 1 of the side diaphragm E, and so on (be followed successively by from left to right
2,3,4,5,6,7,8,9,10), the surface display I is 11.
The 1st embodiment eyepiece design data is as shown in table 1 below:
Table 1
The point range figure schematic diagram of the eyepiece optical system of 1st embodiment according to the present invention shown in attached drawing 2.Point range figure reflects light
The geometry for learning system imaging, ignores diffraction effect, with specified visual field, specified wavelength light focusing as planar cross-sectional formation
Disc of confusion indicates, can simultaneously include the light of multiple visual fields and multi-wavelength.Therefore, the intensive of point range figure disc of confusion can be passed through
Degree, geomery intuitively measure the superiority and inferiority of optical system imaging quality, pass through the dislocation of dot chart different wave length disc of confusion
Degree intuitively measures the color difference of optical system, and the RMS radius (root mean square radii) of point range figure is smaller, the image quality of optical system
It is higher.From the point range figure of the 1st embodiment can be seen that each field rays of the present embodiment in picture according to the present invention shown in attached drawing 2
The disc of confusion radius of plane (display device I) is small and uniform, and different wave length light focuses the disc of confusion to be formed mistake in same a visual field
Position degree is low, and optical aberration obtains well-corrected, and whole uniform, Gao Guangxue can be observed by the eyepiece optical system
The display of performance is drawn a portrait.
Attached drawing 3 (a) and attached drawing 3 (b) respectively illustrate the curvature of field of the eyepiece of the 1st embodiment according to the present invention and distortion is bent
Line.The features such as its optical system ultra-large vision field for symbolizing the present embodiment and high imaging quality.
[embodiment 2]
As shown in Fig. 4, the light channel structure schematic diagram of the eyepiece optical system of the 2nd embodiment of the invention, from eye-observation
Side to the side display device I (from left to right) is followed successively by diaphragm E, the first lens group G1, the second lens group G2 and display device I.Its
In, the first lens group G1 is made of the first lens L1 and the second lens L2, and the second lens group G2 is by the third lens L3, the 4th lens
L4 and the 5th lens L5 is constituted.In the present embodiment, the first lens L1 is positive lens, and the second lens L2 is negative lens, constitutes tool
There is the first lens group G1 of negative power, wherein the first lens L1 is the face type of biconvex shape, the second lens L2 is towards human eye side
Optical surface concave towards human eye direction, and be all even aspheric surface face type for the first lens L1 and the second lens L2, with sufficient
The aberrations such as distortion, color difference and the curvature of field of correction system.
Second lens group G2 described in the present embodiment is made of the third lens L3, the 4th lens L4 and the 5th lens L5,
Middle the third lens L3 is positive lens, the 4th lens L4 is positive lens, the 5th lens L5 is negative lens, fully to correct system picture
Difference, and the first lens L1, the second lens L2, the third lens L3 are all even aspheric surface face type, to provide enough positive light
Focal power realizes big field angle.
The material selection of the first lens of the present embodiment L1, the second lens L2 and the third lens L3 optical glass and optics modeling
Material is applied in combination, to significantly reduce the weight and manufacturing cost of system.Here, with close to the optical surface sequence of the side diaphragm E
Number be 1, and so on (being followed successively by 2,3,4,5,6,7,8,9,10 from left to right), the surface display I be 11.
2nd embodiment eyepiece design data is as shown in table 2 below:
Table 2
The dot chart schematic diagram of the eyepiece optical system of 2nd embodiment according to the present invention shown in attached drawing 5.It can from figure
Out, each field rays of the present embodiment are small and uniform in the disc of confusion radius as plane (display device I), and different wave length light exists
It focuses that the disc of confusion degree of misalignment to be formed is low, and optical aberration obtains well-corrected with visual field, passes through the eyepiece optics
Whole uniform, high optical property display portrait can be observed in system.
Attached drawing 6 (a) and attached drawing 6 (b) respectively illustrate the curvature of field of the eyepiece of the 21st embodiment according to the present invention and distortion is bent
Line.The features such as its optical system ultra-large vision field for symbolizing the present embodiment and high imaging quality.
[embodiment 3]
As shown in Fig. 7, the light channel structure schematic diagram of the eyepiece optical system of the 3rd embodiment of the invention, from eye-observation
Side to the side display device I (from left to right) is followed successively by diaphragm E, the first lens group G1, the second lens group G2 and display device I.Its
In, the first lens group G1 is made of the first lens L1 and the second lens L2, and the second lens group G2 is by the third lens L3, the 4th lens
L4 and the 5th lens L5 is constituted.In the present embodiment, the first lens L1 is positive lens, and the second lens L2 is negative lens, constitutes tool
There is the first lens group G1 of negative power, wherein the first lens L1 is the face type of biconvex shape, the second lens L2 is towards human eye side
Optical surface concave towards human eye direction, and be all even aspheric surface face type for the first lens L1 and the second lens L2, with sufficient
The aberrations such as distortion, color difference and the curvature of field of correction system.
Second lens group G2 described in the present embodiment is made of the third lens L3, the 4th lens L4 and the 5th lens L5,
Middle the third lens L3 is positive lens, the 4th lens L4 is negative lens, the 5th lens L5 is positive lens, fully to correct system picture
Difference, while increasing effective back focal length of system, and the first lens L1, the second lens L2, the third lens L3 are all even aspheric surface
Face type realizes big field angle to provide enough positive focal powers.Here, with close to the optical surface serial number of the side diaphragm E
1, and so on (being followed successively by 2,3,4,5,6,7,8,9,10 from left to right), the surface display I are 11.
3rd embodiment eyepiece design data is as shown in table 3 below:
Table 3
The dot chart schematic diagram of the eyepiece optical system of 3rd embodiment according to the present invention shown in attached drawing 8.It can from figure
Out, each field rays of the present embodiment are small and uniform in the disc of confusion radius as plane (display device I), and different wave length light exists
It focuses that the disc of confusion degree of misalignment to be formed is low, and optical aberration obtains well-corrected with visual field, passes through the eyepiece optics
Whole uniform, high optical property display portrait can be observed in system.
Attached drawing 9 (a) and attached drawing 9 (b) respectively illustrate the curvature of field of the eyepiece of the 21st embodiment according to the present invention and distortion is bent
Line.The features such as its optical system ultra-large vision field for symbolizing the present embodiment and high imaging quality.
The all data of above-described embodiment 1-3 is all satisfied parameter request recorded in summary of the invention, as a result such as the following table 4 institute
Show:
Table 4
| f1/fw | f2/fw | D12/fw | f23/f2 | (R21+R22)/(R21-R22) | |
| Implement 1 | -3.25 | 0.56 | 0.26 | 1.32 | -1.27 |
| Implement 2 | -86.17 | 0.70 | 0.17 | 1.22 | -0.90 |
| Implement 3 | -3.99 | 0.59 | 0.23 | 1.08 | -1.74 |
Embodiment 4-9 design parameter is as shown in table 5 below:
Table 5
Further test proves, constitutes embodiment 4-9 using the eyepiece optical system of the parameters in following table 5,
Each field rays are small and uniform in the disc of confusion radius as plane (display device I), and different wave length light is poly- in same a visual field
The disc of confusion degree of misalignment that coke is formed is low, and optical aberration obtains well-corrected, passes through the eyepiece optical system observable
To whole uniform, high optical property display portrait.
Wherein, the eyepiece optical system design data of above-described embodiment 4 is as shown in table 6 below:
Table 6
After tested, each field rays of the present embodiment 4 are small and uniform in the disc of confusion radius as plane (display device I),
Different wave length light focuses that the disc of confusion degree of misalignment to be formed is low, and optical aberration obtains well-corrected in same a visual field, leads to
Crossing the eyepiece optical system can be observed whole uniform, high optical property display portrait.
The eyepiece optical system design data of above-described embodiment 5 is as shown in table 7 below:
Table 7
After tested, each field rays of the present embodiment 5 are small and uniform in the disc of confusion radius as plane (display device I),
Different wave length light focuses that the disc of confusion degree of misalignment to be formed is low, and optical aberration obtains well-corrected in same a visual field, leads to
Crossing the eyepiece optical system can be observed whole uniform, high optical property display portrait.
The eyepiece optical system design data of above-described embodiment 6 is as shown in table 8 below:
Table 8
After tested, each field rays of the present embodiment 6 are small and uniform in the disc of confusion radius as plane (display device I),
Different wave length light focuses that the disc of confusion degree of misalignment to be formed is low, and optical aberration obtains well-corrected in same a visual field, leads to
Crossing the eyepiece optical system can be observed whole uniform, high optical property display portrait.
Eyepiece optical system all data is all satisfied recorded in summary of the invention in the embodiment 10-28 further provided for
Parameter request, as a result as shown in table 9 below:
Table 9
The results signal such as the specific index path of the eyepiece optical system of embodiment 10-28 and point range diagram as space is limited,
Figure is no longer listed one by one.After tested, in embodiment 10-28 eyepiece optical system each field rays as plane (display device
I disc of confusion radius) is small and uniform, different wave length light in same a visual field focuses the disc of confusion degree of misalignment to be formed low, optics
System aberration obtains well-corrected, and whole uniform, high optical property display picture can be observed by the eyepiece optical system
Picture.
Explanation and specific embodiment further illustrate head-wearing display device of the invention with reference to the accompanying drawing.
It is the composition schematic diagram of the binocular head-wearing display device of present embodiment shown in Figure 10.The binocular wears display dress
Setting 20 includes miniature image display 22 and eyepiece, and eyepiece is between human eye and miniature image display 22, in which: eyepiece is
Eyepiece optical system described in aforementioned any embodiment.Specifically, above-mentioned binocular head-wearing display device 20 includes eyepiece optics
System 21, miniature image display 22, eyepiece lens barrel 23, binocular lens tube fixed plate 24, pupillary distance adjusting device 25.
It is corresponding with the left and right eye of observer, it is the left and right observation lens barrel 201,202 of binocular head-wearing display device 20 respectively,
And be separately connected and be fixed in binocular lens tube fixed plate 24 by pupillary distance adjusting device 25, inside observation lens barrel, from observation side
It rises and has respectively along optical axis: eyepiece optical system 21, miniature image display 22.Meanwhile the optics of eyepiece optical system 21
Element and miniature image display 22 are assemblied in inside eyepiece lens barrel 23.
Preferably, miniature image display 22 is organic electroluminescent luminescent device or transmissive type liquid crystal display.
Preferably, head-wearing display device 20 includes two identical and symmetrically arranged eyepiece optical systems.
It is embodied in application process, the display content on miniature image display 22 is divided by eyepiece optical system 21
Other observed person's left and right eye viewing, forms the visual experience clearly amplified.Observer can be adjusted by pupillary distance adjusting device 25
The relative distance of left and right observation lens barrel, to match the practical interpupillary distance demand for adapting to observer, the binocular vision effect formed.
In the present embodiment, the eyepiece light for meeting right characteristic of the present invention can be carried as binocular head-wearing display device 20
System 21 wears display effect with obtain the performances such as big visual field, high-resolution, low distortion, small size simultaneously.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (11)
1. a kind of eyepiece optical system of the high image quality of big field angle, including from eye-observation side to miniature image display device lateral edge
Coaxial the first lens group and the second lens group being arranged successively of optical axis direction, and the effective focal length of first lens group is f1,
The effective focal length of second lens group is f2, the effective focal length of the eyepiece optical system is fw, meet following relationship (1)
(2):
|f1/fw|>0.85 (1)；
0.4<f2/fw<1.6 (2)；
It is characterized by: first lens group is made of two panels lens, it is proximate to the first lens of human eye side and separate respectively
Second lens of human eye side, and first lens are the positive lens of biconvex shape, second lens are negative lenses；Described
Optical surface of two lens close to human eye side concaves towards human eye side, and radius of curvature is negative value；
Second lens group is made of one or more pieces lens, wherein second lens group is included at least with described first thoroughly
The third lens of microscope group neighbour, the third lens are positive lens；
First lens, second lens and the third lens material property meet following relationship (11), (12) and
(13):
1.50<Nd11<1.82 (11)；
1.55<Nd12<1.75 (12)；
1.50<Nd23<1.78 (13)；
Wherein, above-mentioned Nd11、Nd12、Nd23Respectively described first lens, second lens and the third lens are in d line
Refractive index；
First lens, second lens and the third lens material property also meet following relationship (21), (22)
(23):
35<Vd11<60 (21)；
21<Vd12<35 (22)；
35<Vd23<60 (23)；
Wherein, above-mentioned Vd11、Vd12、Vd23Respectively described first lens, second lens and the third lens are in d line
Abbe number；
Second lens group further includes the 4th lens and the 5th lens, and the third lens, the 4th lens and the 5th lens are pressed from people
Eye side is arranged successively to miniscope side；4th lens and the 5th lens are provided separately, and the third lens
Effective focal length f23With the effective focal length f of the second lens group2Meet following relational expression (8):
0.85≤f23/f2≤1.55 (8)；
The radius of curvature of second lens meets following relationship (3a):
-1.6<(R21+R22)/(R21-R22)<-1.1 (3a)；
Wherein, R21It is second lens close to human eye side surface radius of curvature, R22It is second lens close to image source side table
Curvature radius.
2. eyepiece optical system according to claim 1, which is characterized in that the effective focal length f of second lens group2, the
The effective focal length f of three lens23, meet following relationship (5):
1.12≤f23/f2≤1.37 (5)。
3. eyepiece optical system according to claim 1, which is characterized in that optics of second lens close to human eye side
Surface is aspherical, and the radius of curvature of two optical surfaces of second lens meets following relationship (3):
-2.6<(R21+R22)/(R21-R22)<-0.5 (3)；
Wherein, R21It is second lens close to human eye side surface radius of curvature, R22It is second lens close to image source side table
Curvature radius.
4. eyepiece optical system according to claim 2, which is characterized in that the first lens of first lens group and
The distance between two lens meet following relationship (4):
0.06<D12/fw<0.30 (4)；
Wherein, D12It is close close to the optical surface center of image source side and second lens along the first lens described in optical axis direction
The optical surface centre distance of human eye side.
5. eyepiece optical system according to claim 1, which is characterized in that the effective focal length f of first lens group1, the
The effective focal length f of two lens groups2And the effective focal length f of eyepiece optical systemwMeet following relational expression (1b), (2b):
-7.8<f1/fw<-1.6 (1b)；
0.48<f2/fw<0.68 (2b)。
6. eyepiece optical system according to claim 1, which is characterized in that first lens of first lens group
The distance between described second lens meet following relationship (4a):
0.14<D12/fw<0.27 (4a)；
Wherein, D12For along the first lens of optical axis direction close to image source side optical surface center and the second lens close to human eye side
Optical surface centre distance.
7. eyepiece optical system according to claim 1, which is characterized in that first lens, second lens, institute
Stating the third lens, the 4th lens and the 5th lens is glass material or plastic material.
8. eyepiece optical system according to claim 1, which is characterized in that first lens, second lens, institute
Stating one or more of the third lens, the 4th lens and described 5th lens is axisymmetric aspheric surface lens.
9. a kind of head-wearing display device, including miniature image display and eyepiece, the eyepiece is located at human eye and the microdrawing
As between display, it is characterised in that: the eyepiece is eyepiece optical system described in any item of the claim 1 to 8.
10. head-wearing display device according to claim 9, which is characterized in that the miniature image display is Organic Electricity
Photoluminescence luminescent device or transmissive type liquid crystal display.
11. head-wearing display device according to claim 10, which is characterized in that the head-wearing display device includes two phases
The same and symmetrically arranged eyepiece optical system.
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| WO2023019125A1 (en) * | 2021-08-11 | 2023-02-16 | Zygo Corporation | Optical module |
| US11966041B2 (en) | 2022-08-09 | 2024-04-23 | Zygo Corporation | Optical module |
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| WO2019079996A1 (en) * | 2017-10-25 | 2019-05-02 | 深圳市柔宇科技有限公司 | Eyepiece and head-mounted electronic device |
| CN110426838B (en) * | 2019-07-29 | 2023-06-20 | 深圳纳德光学有限公司 | Eyepiece optical system and head-mounted display |
| JP7076160B2 (en) | 2019-07-29 | 2022-05-27 | 深▲ゼン▼納徳光学有限公司 | Eyepiece optical system and head-mounted display |
| CN113433705A (en) * | 2021-08-26 | 2021-09-24 | 沂普光电(天津)有限公司 | VR optical lens module |
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| CN101887166A (en) * | 2010-07-15 | 2010-11-17 | 深圳航天科技创新研究院 | Ocular |
| CN104965306A (en) * | 2015-07-10 | 2015-10-07 | 深圳纳德光学有限公司 | Large-field-angle eye lens optical system |
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| JP2010266776A (en) * | 2009-05-18 | 2010-11-25 | Olympus Imaging Corp | Eyepiece optical system and electronic view finder using the same |
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| CN101887166A (en) * | 2010-07-15 | 2010-11-17 | 深圳航天科技创新研究院 | Ocular |
| CN104965306A (en) * | 2015-07-10 | 2015-10-07 | 深圳纳德光学有限公司 | Large-field-angle eye lens optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023019125A1 (en) * | 2021-08-11 | 2023-02-16 | Zygo Corporation | Optical module |
| US11966041B2 (en) | 2022-08-09 | 2024-04-23 | Zygo Corporation | Optical module |
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