CN205450452U - Eyepiece camera lens, wear and show optical system and head -mounted apparatus - Google Patents
Eyepiece camera lens, wear and show optical system and head -mounted apparatus Download PDFInfo
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- CN205450452U CN205450452U CN201521141024.5U CN201521141024U CN205450452U CN 205450452 U CN205450452 U CN 205450452U CN 201521141024 U CN201521141024 U CN 201521141024U CN 205450452 U CN205450452 U CN 205450452U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 57
- 239000006185 dispersion Substances 0.000 claims description 6
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 4
- 210000001747 pupil Anatomy 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000004075 alteration Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 229920001169 thermoplastic Polymers 0.000 description 1
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Abstract
The utility model discloses an eyepiece camera lens, wear and show optical system and head -mounted apparatus, the eyepiece camera lens adopts single positive lens, the positive lens has the first surface of protruding phototropic emitting direction and the second surface of protruding phototropic incident direction, and first surface and second surface are the aspheric surface, and satisfies following face type parameter and relation: the radius absolute value of first surface is r1, and the quadratic term coefficient is k1, and the radius absolute value of second surface is r2, and the quadratic term coefficient is k2, and the thickness of positive lens is d, and total focus of the optical system that the positive lens corresponds is f, wherein, 49 < r1 < 150, 20 < r2 < 40, 0.3 < r1r2 < 0.45, - 3 < k1 < 0.5, - 3 < k2 < 0.5, 33 < f < 40, 0.45 < fr1 < 0.65, 1.2 < fr2 < 1.8, 2.6 < fd < 3. The utility model discloses a to eyepiece camera lens appropriate allocation face type parameter, effectively kept balance wearing the angle of vision and the light -weighted requirement that shows optical system, reached better display effect.
Description
Technical Field
The utility model relates to a camera lens design field, in particular to eyepiece camera lens, head-mounted display optical system and head-mounted device.
Background
The head-mounted display optical system is an image amplification system based on a display screen, an image generated by the display screen is amplified by the optical system, and an amplified virtual image is presented at a certain distance in front of human eyes, so that a user can be completely immersed in a virtual scene without being interfered by external information. In many applications, the user wearing the display optical system is mobile, which requires the optical system to have a compact structure, a light weight, and a large field of view while ensuring the imaging quality.
One design difficulty of the head-mounted display optical system is that the increase of the focal power of the optical system causes the increase of the curvature of the lens surface, and the lens becomes more and more drum, so that the weight of the head-mounted display optical system is increased, and the optical aberration is increased.
Therefore, how to solve the conflict between the focal power and the light weight of the head-mounted display optical system is an urgent problem to be solved on the development path of the head-mounted display optical system.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an eyepiece lens, a head-mounted display optical system, and a head-mounted apparatus to solve the above problems or at least partially solve the above problems.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
in one aspect, the utility model provides an eyepiece camera lens, this eyepiece camera lens adopt single positive lens, positive lens has the first surface of protruding to light outgoing direction and the second surface of protruding to light incident direction, the first surface with the second surface is the aspheric surface, and satisfies following face type parameter and relation:
the absolute value of the radius of the first surface is r1, the coefficient of the quadratic term is k1, the absolute value of the radius of the second surface is r2, the coefficient of the quadratic term is k2, the thickness of the positive lens is d, and the total focal length of an optical system corresponding to the positive lens is f; wherein,
49＜r1＜150，20＜r2＜40，0.3＜r1/r2＜0.45；
-3＜k1＜-0.5，-3＜k2＜-0.5；
33＜f＜40；
0.45＜f/r1＜0.65，1.2＜f/r2＜1.8，2.6＜f/d＜3。
preferably, the back focal length of the optical system corresponding to the positive lens is L, and 23 < L < 34.
Preferably, the positive lens has a refractive index in the range of 1.45 < n < 1.70 and a dispersion in the range of 50 < v < 75.
Further preferably, the positive lens adopts COP cycloolefin polymer of K26r type.
Further preferably, the positive lens has a refractive index n of 1.535 and a dispersion v of 56.
On the other hand, the utility model provides a wear to show optical system, this wear to show optical system and include in proper order against light incident direction: the diaphragm, the eyepiece camera lens that above-mentioned scheme provided to and the display screen.
Preferably, the diaphragm is located at the pupil of the human eye.
In another aspect, the present invention provides a head-mounted device, which includes the head-mounted display optical system provided by the above scheme.
The utility model provides a technical scheme has following beneficial effect: 1. the eyepiece lens adopting a single positive lens has the advantages of simple structure, small volume and light weight, and reduces the burden of a user; 2. the relationship between the surface type parameters of the positive lens and the surface type parameters is reasonably configured, so that a large field angle of 96 degrees is obtained, and the requirements of the field angle and the light weight of the head-mounted display optical system are effectively balanced; 3. the eyepiece lens adopting the aspheric plastic lens has lower cost and is beneficial to mass production.
Drawings
Fig. 1 is a schematic view of an eyepiece lens provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the working principle of the head-mounted display optical system;
fig. 3 is a schematic diagram of a head-mounted display optical system according to an embodiment of the present invention;
fig. 4 is a field curvature graph of a head-mounted display optical system according to an embodiment of the present invention;
fig. 5 is a distortion curve diagram of a head-mounted display optical system according to an embodiment of the present invention;
fig. 6 is a dot-column diagram of a head-mounted display optical system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The first embodiment is as follows:
fig. 1 is a schematic diagram of an eyepiece lens provided in this embodiment, as shown in fig. 1, the eyepiece lens 120 employs a single positive lens 121, the positive lens 121 has a first surface S1 convex toward the light exit direction and a second surface S2 convex toward the light entrance direction, and both the first surface S1 and the second surface S2 are aspheric surfaces, and satisfy the following surface type parameters and relationships:
the absolute value of the radius of the first surface S1 is r1, the coefficient of the quadratic term is k1, the absolute value of the radius of the second surface S2 is r2, the coefficient of the quadratic term is k2, the thickness of the positive lens 121 is d, the total focal length of the optical system corresponding to the positive lens 121 is f, and the back focal length of the optical system corresponding to the positive lens 121 is L; wherein,
49＜r1＜150，20＜r2＜40，0.3＜r1/r2＜0.45；
-3＜k1＜-0.5，-3＜k2＜-0.5；
33＜f＜40；
0.45＜f/r1＜0.65，1.2＜f/r2＜1.8，2.6＜f/d＜3；
23＜L＜34。
In this embodiment, the positive lens 121 has a refractive index range of 1.45 < n < 1.70 and a dispersion range of 50 < v < 75, and since plastic materials are inexpensive and lightweight and can be easily added to an aspherical type, a cop (cyclic olefin polymers) type K26r, which has a refractive index of 1.535 and a dispersion of 56, is preferably used.
Among them, COP cycloolefin polymer is an amorphous transparent copolymer having a cyclic olefin structure, which is an amorphous thermoplastic.
The eyepiece lens of the embodiment adopts a very simple structure and only consists of a single positive lens, two effective light-passing surfaces of the positive lens are aspheric surfaces, two surfaces are easy to machine and form, and the eyepiece lens is low in weight and cost and suitable for batch production; in addition, in the embodiment, by reasonably setting the surface type parameters of the two surfaces and the relationship among the parameters, the optical system formed by the single positive lens can obtain a large field angle of 96 degrees.
Example two:
fig. 2 is the utility model provides a wear to show optical system's schematic diagram, as shown in fig. 2, light is sent by the display screen and forms a huge virtual image in 2 meters distant places before people's eye behind eyepiece camera lens formation of image, and what people's eye sees is both this virtual image, and optical system's effect is similar with the magnifying glass, and its purpose is the information on the enlarged display screen, then becomes the virtual image to distant places, makes the user can immerse completely among the virtual sight, does not receive external information's interference.
Fig. 3 is a schematic diagram of the head-mounted display optical system provided in this embodiment, and as shown in fig. 3, the head-mounted display optical system sequentially includes, against the incident direction of light: a diaphragm 110, an eyepiece lens 120, and a display screen 130.
The system adopts a back-tracking light path design during design, the image surface position in fig. 3 is a display screen 130, the object surface position is a virtual image generated by an eyepiece lens 120, a diaphragm 110 is positioned at the pupil of a human eye, and a positive lens 121 converges divergent off-axis chief rays.
The eyepiece lens 120 of the head-mounted display optical system of this embodiment is the eyepiece lens described in the first embodiment, and is not described herein again.
In this embodiment, the display screen 130 may be a 5-6 inch LCD display screen.
Based on the above-described parameters, the head-mounted display optical system achieves a field angle of 96 °. When a user wearing the optical display system puts eyes at the position of the stop 110, light emitted from the display screen 130 passes through the eyepiece lens 120 and forms an enlarged virtual image 2 meters in front of the eyes.
Fig. 3 and 4 are graphs showing field curvature and DISTORTION curves of the head mounted display optical system of the present embodiment, in which fig. 3 is a field curvature curve (FIELDCURVATURE) and fig. 4 is a DISTORTION curve (distorrion).
The field curvature is an aberration of a curved image formed by an object plane, and needs to be characterized by meridional field curvature and sagittal field curvature, as shown in fig. 3, a T line in the field curvature is the meridional field curvature, an S line is the sagittal field curvature, a difference between the two is astigmatism of the optical system, the field curvature and the astigmatism are important aberrations affecting the off-axis field light of the optical system, and the off-axis light imaging quality of the optical system is seriously affected by the two being too large, and it can be seen that the field curvature and the astigmatism of the optical system are both corrected to be in a minimum range.
Distortion does not affect the clarity of the optical system, but causes distortion of the image of the system, and for wide-angle lenses, it is extremely difficult to correct distortion, which can be solved by post-image processing.
Fig. 4 shows a dot array diagram of the head mounted display optical system of the present embodiment. The dot-column diagram ignores diffraction effects and reflects the geometry imaged by the optical system. In the point diagram of the large aberration system, the distribution of points can approximately represent the energy distribution of the point image. Therefore, in the image quality evaluation, the density of the available point sequence chart can more intuitively reflect and measure the imaging quality of the system, and the smaller the RMS radius of the point sequence chart is, the better the imaging quality of the system is proved. As shown in fig. 4, the radius of the bitmap RMS of the head-mounted optical system is less than 220um, and the light spots of each visual field are small, which indicates that the energy distribution of the system is better optimized and the aberration correction is better.
Example three:
based on the same technical concept as the head-mounted display optical system of the second embodiment, the present embodiment provides a head-mounted device including the head-mounted display optical system of the second embodiment.
To sum up, the utility model provides an eyepiece camera lens, head-mounted display optical system and head-mounted device through the face type parameter of the positive lens of rational configuration eyepiece camera lens, has realized big visual field, lightweight head-mounted display optical system, compares with prior art, has following beneficial effect: 1. the eyepiece lens adopting a single positive lens has the advantages of simple structure, small volume and light weight, and reduces the burden of a user; 2. the relationship between the surface type parameters of the positive lens and the surface type parameters is reasonably configured, so that a large field angle of 96 degrees is obtained, and the requirements of the field angle and the light weight of the head-mounted display optical system are effectively balanced; 3. the eyepiece lens adopting the aspheric plastic lens has lower cost and is beneficial to mass production.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. An eyepiece lens that uses a single positive lens having a first surface convex to a light exit direction and a second surface convex to a light entrance direction, wherein the first surface and the second surface are aspheric and satisfy the following profile parameters and relationships:
the absolute value of the radius of the first surface is r1, the coefficient of the quadratic term is k1, the absolute value of the radius of the second surface is r2, the coefficient of the quadratic term is k2, the thickness of the positive lens is d, and the total focal length of an optical system corresponding to the positive lens is f; wherein,
49＜r1＜150，20＜r2＜40，0.3＜r1/r2＜0.45；
-3＜k1＜-0.5，-3＜k2＜-0.5；
33＜f＜40；
0.45＜f/r1＜0.65，1.2＜f/r2＜1.8，2.6＜f/d＜3。
2. an eyepiece lens as recited in claim 1, wherein said positive lens has a corresponding optical system back focal length of L, 23 < L < 34.
3. An eyepiece lens as recited in claim 1, wherein said positive lens has a refractive index in the range of 1.45 < n < 1.70 and a dispersion in the range of 50 < v < 75.
4. An eyepiece lens as recited in claim 3 wherein said positive lens is a COP cyclo-olefin polymer model K26 r.
5. An eyepiece lens as recited in claim 4, wherein said positive lens has a refractive index n-1.535 and a dispersion v-56.
6. A head-mounted display optical system, comprising, in order against a light incidence direction: an aperture, an eyepiece lens as claimed in any one of claims 1 to 5, and a display screen.
7. The head-mounted display optical system of claim 6, wherein the stop is located at a pupil of the human eye.
8. A head-mounted device characterized by comprising the head-mounted display optical system according to claim 6 or 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521141024.5U CN205450452U (en) | 2015-12-31 | 2015-12-31 | Eyepiece camera lens, wear and show optical system and head -mounted apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521141024.5U CN205450452U (en) | 2015-12-31 | 2015-12-31 | Eyepiece camera lens, wear and show optical system and head -mounted apparatus |
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| CN205450452U true CN205450452U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521141024.5U Withdrawn - After Issue CN205450452U (en) | 2015-12-31 | 2015-12-31 | Eyepiece camera lens, wear and show optical system and head -mounted apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105511078A (en) * | 2015-12-31 | 2016-04-20 | 北京小鸟看看科技有限公司 | Ocular lens, head-mounted display optical system and head-mounted equipment |
| CN109407301A (en) * | 2018-11-30 | 2019-03-01 | 重庆爱奇艺智能科技有限公司 | A kind of eyepiece and headset equipment |
| JPWO2021149628A1 (en) * | 2020-01-23 | 2021-07-29 |
-
2015
- 2015-12-31 CN CN201521141024.5U patent/CN205450452U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105511078A (en) * | 2015-12-31 | 2016-04-20 | 北京小鸟看看科技有限公司 | Ocular lens, head-mounted display optical system and head-mounted equipment |
| US9835846B2 (en) | 2015-12-31 | 2017-12-05 | Beijing Pico Technology Co., Ltd. | Ocular lens, headset display optical system, and headset device |
| CN109407301A (en) * | 2018-11-30 | 2019-03-01 | 重庆爱奇艺智能科技有限公司 | A kind of eyepiece and headset equipment |
| CN109407301B (en) * | 2018-11-30 | 2021-06-15 | 重庆爱奇艺智能科技有限公司 | Eyepiece and head-mounted equipment |
| JPWO2021149628A1 (en) * | 2020-01-23 | 2021-07-29 | ||
| JP7393755B2 (en) | 2020-01-23 | 2023-12-07 | 国立大学法人東京農工大学 | Head-mounted display and virtual image forming lens used therein |
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Granted publication date: 20160810 Effective date of abandoning: 20180216 |