CN111965824B - Optical lens group and near-to-eye display system using same - Google Patents
Optical lens group and near-to-eye display system using same Download PDFInfo
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- CN111965824B CN111965824B CN202010870979.3A CN202010870979A CN111965824B CN 111965824 B CN111965824 B CN 111965824B CN 202010870979 A CN202010870979 A CN 202010870979A CN 111965824 B CN111965824 B CN 111965824B
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/011—Head-up displays characterised by optical features comprising device for correcting geometrical aberrations, distortion
Abstract
The invention provides an optical lens group, which comprises a first lens, a second lens and at least one first cemented lens cemented by a positive lens and a negative lens which are randomly arranged, wherein the focal length of the optical lens group is as follows: 5 mm-and-f-woven fabric (Tw) is 20mm. The invention also provides a near-to-eye display system, and the optical lens group and the system have the advantages of light modeling, good display effect, suitability for users with different visual degrees and wide application range.
Description
Technical Field
The present invention relates to an optical system, and more particularly, to an optical lens assembly and a near-to-eye display system using the same.
Background
As the concept of Virtual Reality (VR) and Augmented Reality (AR) has been proposed, the market of near-eye display devices based on VR or AR modes has also been greatly developed. Among the hardware implementations that apply AR or VR technology, head-Mounted Display (HMD) and Near-Eye Display (NED) are the most efficient implementations that bring the best experience to the user in the prior art.
A near-eye display is a head-mounted display that can project an image directly into the eye of a viewer. The display screen of the NED is close to human eyes and is smaller than the photopic distance, the human eyes cannot directly distinguish image contents on the display screen, the images can be approximately far away through the NED optical system and are refocused on retinas of the human eyes, and the images seen by the human eyes are as if the images are more than several meters, so that the display effect of the AR and VR technology is achieved.
Because the near-eye display needs to be worn on the head of a person, the light, the small size and the good display effect are important.
Disclosure of Invention
In view of the above, the present invention provides an optical lens assembly capable of reducing volume and aberration and a near-eye display system using the same, which mainly comprises:
an optical lens group for projection, comprising a first lens, a second lens and at least a first cemented lens cemented by a positive lens and a negative lens which are randomly arranged, wherein the focal length of the optical lens group is as follows: 5 mm-and-f-woven fabric (Tw) is 20mm.
Further, the first cemented lens is located intermediate the first lens and the second lens.
Further, the surface type of the first lens and the second lens is spherical or aspherical.
Further, the optical lens group further comprises a second cemented lens formed by a positive lens and a negative lens which are coaxially cemented, wherein the second cemented lens is a spherical surface or an aspherical surface.
The invention also provides a near-to-eye display system comprising the optical lens group, which comprises a spectroscope which is not coaxial with the visual axis of a user, wherein a reflector, the optical lens group and a micro-display are sequentially arranged above the spectroscope from the side close to the human eyes; the rear surface of the reflector is a curved surface and forms a conjugate relationship with the microdisplay.
Furthermore, one side of the spectroscope facing the human eye is a curved surface, and a reflection film with a predetermined transmission inverse ratio is coated on the curved surface.
Furthermore, the included angle between the optical axis of the optical lens group and the micro display is less than 20 degrees.
Furthermore, the spectroscope is located at a preset position in front of the human eye, and the included angle between the optical axis of the spectroscope and the visual axis of the human eye ranges from 15 degrees to 45 degrees.
Further, the distance between the micro display and the optical lens group is less than 10mm.
Furthermore, the inside and outside surfaces of the spectroscope are different, and the visibility is formed for the external environment light.
The optical lens group can correct system aberration, a near-eye display system using the optical lens group has a good imaging effect, the size of the optical system is reduced by setting the distance between the micro display and the optical lens group, the aberration is further corrected by matching the reflecting mirror and the spectroscope, the imaging quality is improved, the parallax design of the spectroscope can be suitable for users with different visual degrees, the application range of the optical system is enlarged, and the optical lens group is easy to popularize and use.
Drawings
FIG. 1 is a schematic view of an optical lens assembly according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a modification of the first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an optical lens assembly according to a second embodiment of the present invention;
fig. 4 is a schematic structural view of a modification of the second embodiment of the present invention;
fig. 5 and 6 are schematic structural views of a near-eye display system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention provides an optical lens group, which comprises at least one cemented lens and coaxial single lenses, wherein the cemented lens and the single lenses can be randomly arranged. The following embodiments provide several exemplary implementations that may exhibit better imaging results.
First embodiment
As shown in fig. 1, from left to right, the first lens 11, the first cemented lens 12 and the second lens 13 are sequentially included from a side far away from the light source, wherein a front surface 101 and a rear surface 102 of the first lens 11 are spherical or aspheric, a front surface 106 and a rear surface 107 of the second lens 13 are spherical or aspheric, and are used for correcting aberration of the optical lens group, the front surface is a surface on the side far away from the image source, i.e., on the left side, of the lens in the optical lens group, the rear surface is a surface on the right side, the first cemented lens 12 is cemented with a positive lens and a negative lens, the left side is a negative lens and is formed by a material having a relatively high refractive index and a small abbe number compared with the positive lens, and the right side is a positive lens and is formed by a material having a relatively low refractive index and a large abbe number compared with the negative lens. Thereby achieving the effects of correcting paraxial spherical aberration and reducing chromatic aberration. The surface of the first cemented lens 12 is, from left to right, a front surface 103, a cemented surface 104 and a back surface 105, and a focal length f of the first cemented lens 12 12 Satisfies the following conditions: 35mm<f 12 <45mm, focal length f of the first lens 11 11 Is 18mm<f 11 <25mm, focal length f of the second lens 13 13 Is 10mm<f 13 <20mm. The focal length f of the optical lens group satisfies: 5mm<f<20mm. Table 1 and table 2 show the design parameters of the optical surfaces of the lenses in the optical lens assembly, wherein the surfaces of the first lens element 11 and the second lens element 13 are aspheric, and the surface of the first cemented lens element 12 is spherical.
TABLE 1
TABLE 2
Wherein the equation for the aspheric surface is:
where c is the inverse of the radius of curvature, r is the radial distance of a point on the surface, k is the conic constant, and Ai is the high order term coefficient.
Modification examples
It will be understood by those skilled in the art that the order of the first cemented lens and the first and second lenses may be randomly adjusted as needed without affecting the object of the present invention. FIG. 2 shows a modification in which a first lens 21, a second lens 23 and a first cemented lens 22 are arranged in this order from the side away from the light source, and the focal length f of the first lens 21 is set to improve the image formation effect 21 ：18mm<f 21 <25mm, the focal length of the first cemented lens 22 is: 8mm<f 22 <18mm, focal length f of the second lens 23 23 Comprises the following steps: 30mm<f 23 <40mm. Focal length f of the optical lens group: 5mm<f1<20mm. Table 3 shows the optics in the modificationIn the present group of examples, the surfaces of the first lens element and the second lens element are aspheric, and the surface of the first cemented lens element is spherical.
TABLE 3
TABLE 4
Wherein the equation for the aspheric surface is:
c is the reciprocal of the radius of curvature, r is the radial distance of a point on the surface, k is the conic constant, and Ai is the higher order term coefficient.
Second embodiment
Different from the first embodiment, the optical lens assembly shown in fig. 3 further includes a second cemented lens 34 in addition to the first lens 31, the first cemented lens 32 and the second lens 33, the first cemented lens 32 and the second cemented lens 34 are both cemented by a positive lens and a negative lens, the positive lens is located on the left side, the negative lens is located on the right side, the positive lens is made of a material with a lower refractive index and a large abbe number than the negative lens, and the negative lens is made of a material with a higher refractive index and a small abbe number than the positive lens. The correction capability of the optical lens group for chromatic aberration is further improved by the second cemented lens 34. The position of the second cemented lens can be randomly at any position of the optical axis of the optical lens group, and the correction capability for chromatic aberration is optimal when the second cemented lens is positioned at the side closest to the light source. The surface shapes of the first lens 31, the first cemented lens 32, the second lens 33, and the second cemented lens 34 may be spherical or aspherical. Wherein the focal length of the first lens 31 is 30mm and f31 or 40mm, and the focal length f32 of the first cemented lens: 200mm < -f32 < -300mm, and the focal length f33 of the second lens is: 25mm and f33 were woven into 35mm, and the focal length f34 of the second cemented lens was: 18mm-or-f34-or-25mm-and-focal length of optical lens group f:5 mm-and-f-woven fabric (Tw) is 20mm. The present invention provides a set of design parameters of the second embodiment, as shown in table 5, in which all surfaces of the optical lens group are spherical
TABLE 5
Modification examples
It is to be understood that the optical lens group in which the single lenses and the cemented lenses can be arranged randomly is not limited to the arrangement in the second embodiment, and as shown in fig. 4, a first lens 41, a second lens 43, a first cemented lens 42, and a second cemented lens 44 are arranged in this order from the side away from the light source, and the optical lens group focal length f:5mm<f<20mm, the focal length f of the first lens 41 in this embodiment is for better display effect 41 ：20mm<f 41 <40mm, focal length f of the second lens 43 43 Comprises the following steps: 60mm<f 43 <80mm, focal length f of the first cemented lens 42 42 Comprises the following steps: 30mm<f 42 <50mm, focal length f of the second cemented lens 44 44 Is 10mm<f 44 <20mm. The design parameters of each single lens and the cemented lens group in the optical lens group are shown in table 6, the surface type of each single lens and the cemented lens group can be spherical or aspherical, and in this group of examples, designs that are all spherical are selected.
TABLE 6
| Surface marking | Type (B) | Radius of curvature | Thickness of | Refractive index | Abbe number | Y eccentricity | Z | Alpha tilt | |
| 401 | Spherical surface | 40.00 | 2.7 | 1.9241 | 25.70 | 48.14 | 53.04 | 1.12 | |
| 402 | Spherical surface | -70.47 | 1.6 | ||||||
| 403 | Spherical surface | 22.85 | 1.0 | 1.5807 | 68.60 | ||||
| 404 | Spherical surface | 11.39 | 5.8 | 1.9460 | 17.94 | ||||
| 405 | Spherical surface | -46.81 | 0.3 | ||||||
| 406 | Spherical surface | -15.77 | 5.0 | 1.9108 | 35.25 | ||||
| 407 | Spherical surface | -24.86 | 4.8 | ||||||
| 408 | Spherical surface | 11.17 | 7.2 | 1.8989 | 35.94 | ||||
| 409 | Spherical surface | -18.70 | 2.1 | 1.9348 | 32.16 | ||||
| 410 | Spherical surface | 179.54 | 4.4 |
It will be appreciated by those skilled in the art that the implementation of the optical lens assembly is not limited to the implementation in the above embodiments, and the addition of a cemented lens or a single lens can achieve the inventive purpose of the optical lens assembly. However, with the increase of the cemented lens and the single lens, the imaging quality of the optical lens group is improved, and the weight of the optical lens group is increased, and the implementation mode provided by the scheme of the invention is a design mode which balances the imaging quality and the weight.
The invention also provides a near-eye display system comprising the optical lens group, as shown in fig. 5 and 6, the near-eye display system comprises a micro display 5 for providing image source display, an optical lens group 3 (4), a reflective spectroscope 1 and a reflecting mirror 2. The spectroscope 1 is used for correcting off-axis aberration and deflection optical axis angle in a near-to-eye display system, the front surface 501 of the spectroscope is a curved surface and faces towards human eyes, the surface of the spectroscope is coated with a reflection film with a predetermined transmission inverse ratio, the rear surface 502 of the spectroscope is a curved surface, the predetermined transmission inverse ratio can be set as required, so that the intensity of image light reaching the human eyes is moderate, and preferably, the image light transmittance is 30-50%; the curved surface can be a free curved surface, a cylindrical surface, an aspheric surface, a spherical surface and the like; the spectroscope 1 is fixed at a preset position in front of human eyes, the optical axis of the spectroscope 1 is not coaxial with the visual axis of the human eyes, the included angle between the optical axis and the visual axis ranges from 15 degrees to 45 degrees, and preferably, the included angle is 25 degrees, so that more image light can be reflected into the human eyes. Furthermore, the front and back surfaces of the spectroscope 1 are different to form parallax, so that the optical system is suitable for users with different visual degrees.
The front surface 503 of the reflector 2 is a curved surface or a plane, the rear surface 504 is a curved surface facing the optical lens group, and the rear surface 504 is coated with a total reflection film, wherein the curved surface can be a free curved surface, a cylindrical surface, an aspheric surface, a spherical surface, and the like.
The optical axis of the optical mirror group forms an angle with the optical axis of the microdisplays, preferably, the angle is smaller than 20 degrees, and the length of the optical mirror group in the y-axis direction is equal to or larger than the microdisplays in order to receive the image light emitted by all the microdisplays, further, the distance between the microdisplays and the optical mirror group is as small as possible, thereby reducing the size of the near-eye display system, preferably, the distance is smaller than 10mm. The optical lens group can correct the aberration of a near-to-eye display system and improve the display effect.
Image light emitted by the micro display is amplified by the optical lens group and then reaches the reflecting mirror 2, the reflecting mirror 2 reflects the image light to the spectroscope 1 again and then reaches human eyes after being reflected by the spectroscope 1, and external environment light passes through the spectroscope 1 and then is superposed with light of the image light to form a display effect of augmented reality.
The micro display can be selected from an LCD, an OLED, an Lcos or a MEMS scanning mirror, wherein the Lcos display can increase the brightness of the image light entering the eye.
The reflector 2 and the spectroscope 1 are matched to correct aberration and achieve a good display effect, the reflector 2 and the image source are located at an approximate infinite conjugate relation, and in order to avoid the shielding of the sight line, the reflector 2, the optical lens group 3 (4) and the micro-display 5 are out of the sight line range of human eyes.
Table 7 gives the parameters of the optical surfaces in the near-eye display system, where surface 6 is the plane of the exit pupil, surfaces 501, 502 are the front and back surfaces of the beam splitter 1, surfaces 503, 504 are the front and back surfaces of the mirror 2, surfaces 505, 506 are the front and back surfaces of the first lens in the optical lens set, surfaces 507, 508, 509 are the front, glue and back surfaces of the first glue lens, surfaces 510, 511 are the front and back surfaces of the second lens, surfaces 512, 513, 514 are the front, glue and back surfaces of the second glue lens, and surfaces 515, 516 are the front and back surfaces of the microdisplay, respectively. In this embodiment, the front surface 501 of the beam splitter 1 and the rear surface 502 of the reflector 2 are free-form surfaces, and the other surfaces are designed as spherical surfaces.
TABLE 7
Among the above surfaces, a surface whose surface shape is a spherical surface satisfies the equation:
where c is the inverse of the radius of curvature and r is the radial distance of a point on the surface.
The surface of the free-form surface with the surface type of XY polynomial satisfies the equation:
where c is the reciprocal of the radius of curvature, r is the radial distance of a point on the surface, k is the conic constant, and Cj is the polynomial coefficient, see table 8.
TABLE 8
The present invention also provides the near-eye display system design parameters exemplified in fig. 6, as shown in table 9. Wherein, the surface 6 is a plane of the exit pupil of the human eye, the surface 601 is a front surface of the beam splitter 1, the surface 604 is a rear surface of the reflector 2, the surfaces 605 and 606 are front and rear surfaces of the first lens in the optical lens assembly, the surfaces 607, 608 and 609 are a front surface, a cemented surface and a rear surface of the first cemented lens in the optical lens assembly, the surfaces 610 and 611 are front and rear surfaces of the second lens, and the surface 612 is a front surface of the microdisplay.
TABLE 9
Wherein the surface formed as a sphere satisfies the equation:
where c is the inverse of the radius of curvature and r is the radial distance of a point on the surface.
A surface configured as an aspheric surface satisfies the equation:
c is the reciprocal of the radius of curvature, r is the radial distance of a point on the surface, k is the conic constant, and Ai is the higher order term coefficient.
The surface of the free-form surface constituted as an XY polynomial satisfies the equation:
where c is the reciprocal of the radius of curvature, r is the radial distance of a point on the surface, k is the conic constant, and Cj is the polynomial coefficient, see tables 10 and 11.
TABLE 10
TABLE 11
It will be understood by those skilled in the art that the implementation of the near-eye display system is not limited to the above-described embodiments, and any system can be used to achieve the object of the present invention as long as the image magnification effect can be achieved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A near-to-eye display system comprises a spectroscope which is not coaxial with a visual axis of a user, wherein a reflecting mirror, an optical lens group and a micro-display are sequentially arranged above the spectroscope from the side close to human eyes; the rear surface of the reflector is a curved surface and is plated with a total reflection film, the rear surface of the reflector and the microdisplay form a conjugate relation, and the included angle between the optical axis of the optical lens group and the microdisplay is less than 20 degrees,
the optical lens group only comprises a first lens, a second lens and a positive-negative cemented lens, wherein the first lens is closest to the human eye side, the positive-negative cemented lens is closest to the image source side, and the negative lens in the positive-negative cemented lens is close to the image source side;
the focal length of the optical lens group is as follows: 5 mm-and-f-woven fabric (Tw) is 20mm.
2. The near-eye display system of claim 1 wherein the first lens and the second lens have spherical or aspherical surface profiles and the positive-negative cemented lens has a spherical surface profile.
3. The near-eye display system of claim 1 wherein the first lens and the second lens are positive lenses.
4. The near-eye display system of claim 1 wherein the side of the beam splitter facing the human eye is curved and coated with a reflective film of a predetermined inverse transmittance ratio.
5. The near-eye display system of claim 1 wherein the beam splitter is positioned at a predetermined location in front of the eye, and the optical axis of the beam splitter is at an angle in the range of 15 degrees to 45 degrees with respect to the visual axis of the eye.
6. The near-eye display system of claim 1 wherein the distance between the microdisplays and the set of optical mirrors is less than 10mm.
7. The near-to-eye display system of claim 1 wherein the beam splitter has different inner and outer surfaces that contribute to the visibility of ambient light.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857754B (en) * | 2021-02-24 | 2023-06-30 | Oppo广东移动通信有限公司 | Near-eye display detection lens and near-eye display device |
| CN113341558B (en) * | 2021-08-02 | 2022-08-05 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
| CN113341555B (en) * | 2021-08-02 | 2022-08-05 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
| CN113325566B (en) * | 2021-08-02 | 2022-08-05 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
| CN113341556B (en) * | 2021-08-02 | 2022-08-05 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012144168A1 (en) * | 2011-04-19 | 2012-10-26 | 富士フイルム株式会社 | Projection lens and projection-type display device using same |
| CN105739084A (en) * | 2016-04-29 | 2016-07-06 | 厦门灵境信息科技有限公司 | Optical lens system and head-mounted display device |
| CN208506365U (en) * | 2018-07-25 | 2019-02-15 | 中山市美景光学信息有限公司 | A kind of eyepiece optical system shown for micro display screen high definition |
| CN110515212A (en) * | 2019-09-27 | 2019-11-29 | 北京耐德佳显示技术有限公司 | A kind of near-eye display system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005181993A (en) * | 2003-11-28 | 2005-07-07 | Sekinosu Kk | Projection lens |
| CN105988194B (en) * | 2015-01-30 | 2019-03-15 | 信泰光学(深圳)有限公司 | Projection lens |
| CN106405818B (en) * | 2016-07-21 | 2019-11-05 | 苏州莱能士光电科技股份有限公司 | Visual system and head-mounted display apparatus |
| CN206594387U (en) * | 2017-03-17 | 2017-10-27 | 苏州龙诺法智能科技有限公司 | Off-axis big emergent pupil is away from intelligent AR glasses |
| CN107065406A (en) * | 2017-03-21 | 2017-08-18 | 北京和光科技有限公司 | A kind of universal short focus projection optical system |
| CN109298506B (en) * | 2017-07-24 | 2021-07-06 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN108646419B (en) * | 2018-07-03 | 2021-06-29 | 杭州光粒科技有限公司 | Rear projection augmented reality display system capable of eliminating bright spots |
-
2020
- 2020-08-26 CN CN202010870979.3A patent/CN111965824B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012144168A1 (en) * | 2011-04-19 | 2012-10-26 | 富士フイルム株式会社 | Projection lens and projection-type display device using same |
| CN105739084A (en) * | 2016-04-29 | 2016-07-06 | 厦门灵境信息科技有限公司 | Optical lens system and head-mounted display device |
| CN208506365U (en) * | 2018-07-25 | 2019-02-15 | 中山市美景光学信息有限公司 | A kind of eyepiece optical system shown for micro display screen high definition |
| CN110515212A (en) * | 2019-09-27 | 2019-11-29 | 北京耐德佳显示技术有限公司 | A kind of near-eye display system |
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