CN104898283A - Ocular lens system and head-mounted display - Google Patents

Ocular lens system and head-mounted display Download PDF

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Publication number
CN104898283A
CN104898283A CN201510270799.0A CN201510270799A CN104898283A CN 104898283 A CN104898283 A CN 104898283A CN 201510270799 A CN201510270799 A CN 201510270799A CN 104898283 A CN104898283 A CN 104898283A
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China
Prior art keywords
eyepiece system
concave mirror
head
mounted display
fresnel lenses
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Granted
Application number
CN201510270799.0A
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Chinese (zh)
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CN104898283B (en
Inventor
王元鹏
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Goertek Optical Technology Co Ltd
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Qingdao Goertek Co Ltd
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Priority to CN201510270799.0A priority Critical patent/CN104898283B/en
Publication of CN104898283A publication Critical patent/CN104898283A/en
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/017Head mounted
    • G02B27/0172Head mounted characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00Eyepieces; Magnifying glasses
    • G02B25/001Eyepieces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00Simple or compound lenses
    • G02B3/02Simple or compound lenses with non-spherical faces
    • G02B3/08Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses an ocular lens system and a head-mounted display. The ocular lens system comprises a display screen, a concave reflecting mirror and a positive lens set, wherein the concave reflecting mirror reflects light emitted by the display screen onto the positive lens set, and the positive lens set refracts light reflected by the concave reflecting mirror to people's eyes. The concave reflecting mirror and the lens sets cooperate with each other to reduce the size of the ocular lens system. In a light convergence process, the concave reflecting mirror bears partial focal power of the ocular lens system, which lowers the requirements of the ocular lens system on the focal power of the lens set, minimizes color difference of the lens set, and reduces the processing material of the lens set. Since the concave reflecting mirror may not generate color difference during a light convergence process, the color difference of the ocular lens system is lowered substantially, the imaging quality is improved, and the mass and the size of the ocular lens system are reduced. The ocular lens system is applicable to the head-mounted display, and provides perfect visual experience for users.

Description

A kind of eyepiece system and head-mounted display
Technical field
The present invention relates to visual device technical field, particularly relate to a kind of eyepiece system and head-mounted display.
Background technology
At present, along with the development of science and technology, head-mounted display enters commercial market, and increasing people brings into use this series products, is enjoyed the visual experience of immersion by the eyepiece system in head-mounted display.But, in the eyepiece system design proposal of current head-mounted display on the market, General Requirements lens combination bears the focal power of whole eyepiece system, therefore need multiple lens mutually adaptive, the aberration that multiple lens produce makes the image quality of eyepiece system greatly reduce, and causing eyepiece system entirety to have the shortcoming that volume is large and quality is large, heavy head-mounted display brings very large pressure to the head of user, significantly reduces experience effect and the comfortableness of user.
Summary of the invention
In view of the above problems, the invention provides a kind of eyepiece system and head-mounted display, to solve the problem or to solve the problem at least in part.
According to one aspect of the present invention, provide a kind of eyepiece system, this eyepiece system comprises: display screen, concave mirror and positive lens groups;
Described concave mirror, the light for being sent by described display screen reflexes in described positive lens groups;
Described positive lens groups, for the anaclasis of being reflected by described concave mirror in human eye.
Alternatively, described positive lens groups is Fresnel Lenses.
Alternatively, the reflecting surface of described concave mirror is concave spherical surface;
The substrate of described Fresnel Lenses is plane, and its light entrance face is convex aspheric surface, and light-emitting face is the annular Fresnel surface with positive light coke.
Alternatively, the aspheric surface quadratic coefficients of the convex aspheric surface of described Fresnel Lenses is: K2 and K4, meets following relation:
K2<-1,K4<-50。
Alternatively, the focal length of described eyepiece system is f, and the focal length of described concave mirror is f1, and the focal length of described Fresnel Lenses is f2, meets following relation:
3<f1/f<10;
0.3<f2/f<1.2。
Alternatively, described concave mirror and the distance of described display screen on optical axis are L, 20<L<40.
Alternatively, the pitch angle of described concave mirror on the optical axis of described Fresnel Lenses is λ, 30 ° of < λ <60 °.
Alternatively, described Fresnel Lenses adopts plastic material, its refractive index and Abbe number scope respectively: 1.45<n<1.70,50<v<75.
According to another aspect of the present invention, provide a kind of head-mounted display, this head-mounted display comprises the eyepiece system as above described in any one.
Alternatively, described head-mounted display regulates the focal length of described eyepiece system within the specific limits; Described eyepiece system realizes focus adjustment according to the operation of the lens combination that user moves in eyepiece system.
From the above, eyepiece system provided by the invention have employed concave mirror in light transmission process and lens combination cooperatively interacts, decrease the volume of eyepiece system, the light that display screen is produced is assembled and is incided in human eye, forms the virtual image that is upright, that amplify in the front a distance of human eye.Wherein, in the process assembled light, concave mirror assume responsibility for a part of focal power of eyepiece system, alleviates the focal power requirement of eyepiece system to lens combination, not only reduce the aberration that lens combination produces, also the corresponding processing materials decreased lens combination; Again because concave mirror can not produce aberration in the process of converging ray, and then the aberration of eyepiece system can be greatly reduced, improve image quality, reduce quality and the volume of eyepiece system.This eyepiece system is applied to head-mounted display, to the more perfect visual experience of user.
Accompanying drawing explanation
Fig. 1 shows a kind of according to an embodiment of the invention schematic diagram of eyepiece system;
Fig. 2 A shows the schematic diagram of Fresnel Lenses according to an embodiment of the invention;
Fig. 2 B show according to an embodiment of the invention with the schematic diagram of the ordinary lens of Fresnel Lenses equivalence;
Fig. 3 shows the point range figure of eyepiece system according to an embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 shows a kind of according to an embodiment of the invention schematic diagram of eyepiece system.As shown in Figure 1, this eyepiece system comprises: display screen 110, concave mirror 120, positive lens groups 130 and diaphragm 140.The light that display screen 110 sends reflexes in positive lens groups 130 by concave mirror 120; The anaclasis that concave mirror 120 reflects by positive lens groups 130 is in diaphragm 140; Eyes due to user are positioned at diaphragm 140 place, and the light that display screen 110 sends by the eyepiece system therefore shown in Fig. 1 finally incides in human eye, and before human eye, form a virtual image of amplifying at a distance, human eye finding is this virtual image.
Visible, eyepiece system shown in Fig. 1 have employed concave mirror in light transmission process and lens combination cooperatively interacts, reduce the volume of eyepiece system, the light that display screen is produced is assembled and is incided in human eye, forms the virtual image that is upright, that amplify in the front a distance of human eye.Wherein, in the process assembled light, concave mirror assume responsibility for a part of focal power of eyepiece system, alleviates the focal power requirement of eyepiece system to lens combination, not only reduce the aberration that lens combination produces, can also the processing materials of corresponding minimizing lens combination; Again because concave mirror can not produce aberration in the process of converging ray, and then the aberration of eyepiece system can be greatly reduced, improve image quality, reduce quality and the volume of eyepiece system, to the more perfect visual experience of user.
In one embodiment of the invention, the reflecting surface of the concave mirror 120 in the eyepiece system shown in Fig. 1 is concave spherical surface; Positive lens groups 130 is Fresnel Lenses.In the present embodiment, the whole focal length of the eyepiece system shown in Fig. 1 is f, and the focal length of concave mirror 120 is f1, and the focal length of Fresnel Lenses 130 is f2, meets following relation: 3<f1/f<10; 0.3<f2/f<1.2.Concave mirror 120 and the distance of display screen 110 on optical axis are L, 20<L<40.Further, the pitch angle of concave mirror 120 on the optical axis of Fresnel Lenses 130 is λ, 30 ° of < λ <60 °.
Fig. 2 A shows the schematic diagram of Fresnel Lenses according to an embodiment of the invention, as shown in Figure 2 A, the light entrance face 131 of this Fresnel Lenses 130 is convex aspheric surface, simultaneously its effect makes convergence of rays allow the outer chief ray of axle bend towards optical axis, in the present embodiment, the aspheric surface quadratic coefficients of this light entrance face 131 is: K2 and K4, meets following relation: K2<-1, K4<-50; Light-emitting face 132 is for having the annular Fresnel surface of positive light coke.Fig. 2 B show according to an embodiment of the invention with the schematic diagram of the ordinary lens of Fresnel Lenses equivalence.As shown in Figure 2 B, the light entrance face 151 of this ordinary lens 150 is and the identical convex aspheric surface of light entrance face 131 shown in Fig. 2 A, and light-emitting face 152 is convex surfaces completely equivalent with the light-emitting face 132 shown in Fig. 2 A.The Fresnel Lenses of the complete equivalence shown in comparison diagram 2A and Fig. 2 B and ordinary lens, can see, compare ordinary lens, Fresnel Lenses is by marking off as multiple concentric circles lines (i.e. Fresnel-zone countless in series of theories by lens, as shown in the light-emitting face 132 in Fig. 2 A) reach identical optical effect, save the consumption of material simultaneously, effectively alleviate quality and the volume of eyepiece system.In one embodiment of the invention, the Fresnel Lenses shown in Fig. 2 A is processing and fabricating on a planar base, reduces difficulty of processing, improves working (machining) efficiency.
In one embodiment of the invention, Fresnel Lenses 130 shown in Fig. 2 A adopts plastic material, its refractive index and Abbe number scope be respectively: 1.45<n<1.70,50<v<75; Particularly, adopt the plastic material of E48R model, its refractive index and Abbe number are respectively: n=1.531160, v=56.04.By adopting plastic material processing and manufacturing Fresnel Lenses, reducing difficulty of processing and processing cost further, reducing the quality of eyepiece system simultaneously.
Based on each feature mentioned above, the eyepiece system shown in Fig. 1 achieves the field angle of 50 °, adapts to the display screen of 5.5 cun, and light is sent by display screen and form a virtual image of amplifying at a distance first 5 meters of human eye after eyepiece system imaging.
Fig. 3 shows the point range figure of eyepiece system according to an embodiment of the invention, and point range figure ignores diffraction effect, reflection be the geometry of optical system imaging.In the point range figure of large aberration system, the distribution of point can the energy distribution of representative point picture approx.Therefore, in image quality evaluation, the dense degree of available point range figure more intuitively reflects and weighs the quality of system imaging quality.The aberration of eyepiece system is not clearly as can be seen from Figure 3, and other aberrations have also been obtained good correction, can meet user and use eyepiece system to watch the demand of shown image on display screen.
Present invention also offers a kind of head-mounted display, this head-mounted display comprises the eyepiece system as above described in any one embodiment.In one embodiment, head-mounted display can regulate the focal length of eyepiece system within the specific limits, makes the eyepiece system in head-mounted display be applicable to myopia population; Particularly, head-mounted display is the pattern that user provides the lens combination that can move in eyepiece system, user can according to self-demand, the position of active adjustment lens combination on optical axis, eyepiece system realizes focus adjustment according to the operation of the lens combination that user moves in eyepiece system, makes its focal length adapt to the human eye perception of myopia population.Based on the parameters of above described eyepiece system, the eyepiece system of head-mounted display provided by the invention can be applicable to the crowd of myopia less than 500 degree.
From the above, eyepiece system provided by the invention have employed concave mirror in light transmission process and lens combination cooperatively interacts, and the light that display screen is produced is assembled and incided in human eye, forms the virtual image that is upright, that amplify in the front a distance of human eye.Have following beneficial effect: 1, in the process assembled light, concave mirror assume responsibility for a part of focal power of eyepiece system, alleviates the focal power requirement of eyepiece system to lens combination, namely decreases the aberration that lens combination produces; Again because concave mirror can not produce aberration in the process of converging ray, and then the aberration of eyepiece system can be greatly reduced, improve image quality.2, by adopting Fresnel Lenses as lens combination, greatly lens material be can save, quality and the volume of eyepiece system reduced.3, Fresnel Lenses adopts planar substrates to process, and adopts plastic material, reduces difficulty of processing and the processing cost of eyepiece system, improves working (machining) efficiency.
This eyepiece system is applied to head-mounted display, reduce quality and the volume of head-mounted display, improve the image quality of head-mounted display, reduce difficulty of processing and the processing cost of head-mounted display, still further provides and regulate the function of the focal length of eyepiece system to make head-mounted display adapt to myopia population.Technical scheme provided by the invention drastically increases experience effect and the comfortableness that user uses head-mounted display, to the more perfect visual experience of user.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.

Claims (10)

1. an eyepiece system, is characterized in that, this eyepiece system comprises: display screen, concave mirror and positive lens groups;
Described concave mirror, the light for being sent by described display screen reflexes in described positive lens groups;
Described positive lens groups, for the anaclasis of being reflected by described concave mirror in human eye.
2. eyepiece system as claimed in claim 1, is characterized in that,
Described positive lens groups is Fresnel Lenses.
3. eyepiece system as claimed in claim 2, is characterized in that,
The reflecting surface of described concave mirror is concave spherical surface;
The substrate of described Fresnel Lenses is plane, and its light entrance face is convex aspheric surface, and light-emitting face is the annular Fresnel surface with positive light coke.
4. eyepiece system as claimed in claim 3, is characterized in that,
The aspheric surface quadratic coefficients of the convex aspheric surface of described Fresnel Lenses is: K2 and K4, meets following relation:
K2<-1,K4<-50。
5. eyepiece system as claimed in claim 2, it is characterized in that, the focal length of described eyepiece system is f, and the focal length of described concave mirror is f1, and the focal length of described Fresnel Lenses is f2, meets following relation:
3<f1/f<10;
0.3<f2/f<1.2。
6. eyepiece system as claimed in claim 5, it is characterized in that, described concave mirror and the distance of described display screen on optical axis are L, 20<L<40.
7. eyepiece system as claimed in claim 6, it is characterized in that, the pitch angle of described concave mirror on the optical axis of described Fresnel Lenses is λ, 30 ° of < λ <60 °.
8. eyepiece system as claimed in claim 2, it is characterized in that, described Fresnel Lenses adopts plastic material, its refractive index and Abbe number scope respectively: 1.45<n<1.70,50<v<75.
9. a head-mounted display, is characterized in that, this head-mounted display comprises the eyepiece system according to any one of claim 1-8.
10. head-mounted display as claimed in claim 9, it is characterized in that, described eyepiece system realizes focus adjustment according to the operation of user's mobile lens group.
CN201510270799.0A 2015-05-25 2015-05-25 A kind of eyepiece system and head-mounted display Active CN104898283B (en)

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN105629479A (en) * 2016-04-05 2016-06-01 杭州映墨科技有限公司 Catadioptric head-wearing display optical system for displaying three-dimensional scene
CN106019568A (en) * 2016-06-30 2016-10-12 北京小鸟看看科技有限公司 Eyepiece system and head-mounted display device
CN106541311A (en) * 2016-10-13 2017-03-29 中国航空工业集团公司洛阳电光设备研究所 A kind of processing method of wedge mirror
CN107121774A (en) * 2017-07-14 2017-09-01 浙江舜宇光学有限公司 Eyepiece and the display device including the eyepiece
WO2018052493A1 (en) * 2016-09-13 2018-03-22 Oculus Vr, Llc Fresnel lens with dynamic draft for reduced optical artifacts
WO2018068356A1 (en) * 2016-10-14 2018-04-19 浙江舜宇光学有限公司 Ocular lens
CN109643024A (en) * 2017-08-15 2019-04-16 深圳市柔宇科技有限公司 Wear display equipment
US10371952B2 (en) 2016-09-13 2019-08-06 Facebook Technologies, Llc Fresnel lens with dynamic pitch
US10379359B2 (en) 2016-09-13 2019-08-13 Facebook Technologies, Llc Fresnel lens with dynamic draft for reduced optical artifacts
CN111458880A (en) * 2020-05-09 2020-07-28 三生万物(北京)人工智能技术有限公司 Waveguide light field display device and head-mounted augmented reality glasses
CN112424669A (en) * 2018-07-24 2021-02-26 株式会社尼康 Eyepiece optical system and head-mounted display

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Cited By (18)

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Publication number Priority date Publication date Assignee Title
CN105629479A (en) * 2016-04-05 2016-06-01 杭州映墨科技有限公司 Catadioptric head-wearing display optical system for displaying three-dimensional scene
CN105629479B (en) * 2016-04-05 2018-06-12 杭州映墨科技有限公司 Refraction-reflection for three-dimensional scenic to be presented wears display optical system
CN106019568B (en) * 2016-06-30 2018-07-10 北京小鸟看看科技有限公司 A kind of eyepiece system and wear display equipment
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WO2018052493A1 (en) * 2016-09-13 2018-03-22 Oculus Vr, Llc Fresnel lens with dynamic draft for reduced optical artifacts
CN106541311B (en) * 2016-10-13 2018-07-13 中国航空工业集团公司洛阳电光设备研究所 A kind of processing method of wedge mirror
CN106541311A (en) * 2016-10-13 2017-03-29 中国航空工业集团公司洛阳电光设备研究所 A kind of processing method of wedge mirror
WO2018068356A1 (en) * 2016-10-14 2018-04-19 浙江舜宇光学有限公司 Ocular lens
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CN107121774A (en) * 2017-07-14 2017-09-01 浙江舜宇光学有限公司 Eyepiece and the display device including the eyepiece
CN107121774B (en) * 2017-07-14 2023-01-13 浙江舜宇光学有限公司 Eyepiece and display device including the same
CN109643024A (en) * 2017-08-15 2019-04-16 深圳市柔宇科技有限公司 Wear display equipment
CN112424669A (en) * 2018-07-24 2021-02-26 株式会社尼康 Eyepiece optical system and head-mounted display
CN112424669B (en) * 2018-07-24 2022-11-29 株式会社尼康 Eyepiece optical system and head-mounted display
CN111458880A (en) * 2020-05-09 2020-07-28 三生万物(北京)人工智能技术有限公司 Waveguide light field display device and head-mounted augmented reality glasses
CN111458880B (en) * 2020-05-09 2022-04-22 三生万物(北京)人工智能技术有限公司 Waveguide light field display device and head-mounted augmented reality glasses

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