CN106249399B - One kind wears eyepiece system and wears display equipment - Google Patents
One kind wears eyepiece system and wears display equipment Download PDFInfo
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- CN106249399B CN106249399B CN201610835992.9A CN201610835992A CN106249399B CN 106249399 B CN106249399 B CN 106249399B CN 201610835992 A CN201610835992 A CN 201610835992A CN 106249399 B CN106249399 B CN 106249399B
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- eyepiece system
- lens
- positive lens
- eyepiece
- luminescent screen
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/04—Eyepieces; Magnifying glasses affording a wide-angle view, e.g. through a spy-hole
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
-
- 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
-
- 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
-
- 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
-
- 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
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
Eyepiece system is worn the invention discloses one kind and wears display equipment, and the eyepiece system of wearing includes：Two groups of eyepieces of luminescent screen and right and left eyes；At light path diaphragm the first positive lens of plastic material and the second negative lens of glass material are set gradually to every group of eyepiece between the luminescent screen, first positive lens has positive light coke, including being convex to the first surface of diaphragm and being convex to the second surface of luminescent screen；Second negative lens has negative power, including concaving towards the third surface of diaphragm and concaving towards the 4th surface of luminescent screen；The first surface and second surface of first positive lens, the third surface and the 4th surface of the second negative lens are even aspheric surface.The technical program rationally designs the focal length and length of optical system, and to carrying out Rational Arrangement using the plastic lens of even aspheric surface, system aberration is corrected, in the case of the image quality for ensureing system, while realizes the demand of miniaturization, lightweight and big field angle.
Description
Present patent application be the applying date on 01 26th, 2015, application No. is 201510039387.6, it is entitled
The divisional application of the Chinese invention patent application of " one kind wears eyepiece system and wears display equipment ".
Technical field
The present invention relates to optical technical field, more particularly to one kind wears eyepiece system and wears display equipment.
Background technology
Previous display HMD (headmounted display) system of wearing has field angle is small (to be usually no more than 45
Degree) the shortcomings that, greatly reduce the experience effect of observing system, it is difficult to feel to the viewing that people immerses, however general optics
Design can increase the aberration of this optical system of distortion and aberration while visual angle is increased, it is difficult to correct, can only pass through the later stage
Software goes the method for processing image, and which improves the design difficulties and cost of machine system, this is also why to wear shadow
The reason of institute market is lukewarm always.
For being applied to wear for the big field angle eyepiece of display system, ratio chromatism, the curvature of field, astigmatism all be influence into
The aberration of image quality amount, therefore there is an urgent need for a kind of suitable optical designs thoroughly to solve the above problems.
Invention content
Worn the present invention provides one kind and eyepiece system and wear display equipment, can while big field angle is obtained school
Positive aberration ensures the viewing experience at big visual angle.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
On the one hand, the eyepiece system of wearing includes：Two groups of eyepieces of luminescent screen and right and left eyes；At system stop to
Every group of eyepiece sets gradually the first positive lens and the second negative lens between the luminescent screen, and first positive lens is plastics material
Matter, second negative lens are glass material；
First positive lens has positive light coke, including being convex to the first surface of diaphragm and being convex to the second of luminescent screen
Surface；
Second negative lens has negative power, including concaving towards the third surface of diaphragm and concaving towards the 4th of luminescent screen
Surface；
The first surface and second surface of first positive lens, the third surface and the 4th surface of second negative lens
It is even aspheric surface.
The technical program wear eyepiece system by light path diaphragm in every group of eyepiece between luminescent screen according to
Secondary setting the first positive lens and the second negative lens since first positive lens has positive light coke, converges light while allows axis
Outer chief ray bends towards optical axis, and the second negative lens thereafter has negative focal power, before can correcting produced by a piece of positive lens
Residual aberration and aberration, negative lens positive in this way combination can just aberration correction reach a relatively good picture quality,
It again can aberration correction while ensure that big visual angle；And using plastic material and the lens school of the even aspheric surface of glass material
The aberration of positive system ensure that ratio chromatism, field can thoroughly be corrected while big field angle is obtained by wearing eyepiece system
The aberrations such as song, astigmatism.
On the other hand, the present invention provides one kind to wear display equipment, and eyepiece system is worn including above-mentioned technical proposal.
Wearing for the technical program shows that equipment can realize 72 ° of diagonal field of view angles, 63 ° of horizontal field of view angles and optics
System overall length be less than 59mm, total weight be less than 34g, therefore disclosure satisfy that lightweight, miniaturization, big visual angle the market demand.
Description of the drawings
Fig. 1 is the operation principle schematic diagram for wearing display equipment；
Fig. 2 is the single group goggle structure schematic diagram provided in an embodiment of the present invention for wearing eyepiece system；
Fig. 3 is the optical transfer function curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system；
Fig. 4 is the curvature of field curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system；
Fig. 5 is the distortion aberration curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system；
Fig. 6 is the point range figure provided in an embodiment of the present invention for wearing eyepiece system；
Fig. 7 is the ratio chromatism, curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is the operation principle schematic diagram for wearing display equipment, and human eye watches display screen through eyepiece, what display screen was sent out
Light is forming a huge virtual image, then received by human eye by the eyepiece at 19 meters of human eye.
When designing the optical system for wearing display equipment, using reversed trace, make to wear the display location of display equipment
In the image planes position of optical system, eye-observation pupil is located at diaphragm；Wherein display screen uses TFT-LCD display screens
(ThinFilmTransistor-Liquid Crystal, Thin Film Transistor-LCD), for reducing system bulk.
The optical system includes luminescent screen and two groups of eyepieces corresponding to right and left eyes, and the image shown on luminescent screen leads to
It crosses right and left eyes eyepiece and enters right and left eyes, reach the big visual field visual experience of 3D or 2D.Wherein every group of eyepiece include a positive lens and
One negative lens：
First positive lens, since it is with positive light coke, can make light convergence simultaneously at the diaphragm of system
Main axis outside the axis is made to bend towards optical axis；
Second negative lens is had negative power, is corrected using high-dispersive optical resin close to the luminescent screen of system
Residual aberration and aberration caused by preceding a piece of positive lens；All pictures can just be corrected by the combination of positive negative lens in this way
Difference, and reach a relatively good picture quality.
Based on above-mentioned design philosophy, the present invention provides one kind to wear eyepiece system, this is worn eyepiece system and includes：It shines
Two groups of eyepieces of screen and right and left eyes.
The present invention the operation principle for wearing eyepiece system be：The luminescent screen of system is divided into two by split screen technology
Sub-screen, respectively display corresponding to right and left eyes 2D images or 3D rendering, make the image on sub-screen pass through right and left eyes eyepiece into
Enter right and left eyes, realize the big visual angle visual experience of 2D or 3D.The preferred 1440P of luminescent screen wherein, in the embodiment of the present invention,
5.5 inches of TFT-LCD display screens, after split screen display available, the size of two sub-screens is respectively 60.48mm*68.04mm, excellent
Selection of land can add barn door between two sub-screens in practical applications, and light leakage is avoided to influence user experience.
TFT-LCD is currently the only to be caught up with comprehensively in the comprehensive performances such as brightness, contrast, power consumption, service life, volume and weight
The upper and display device more than CRT, its function admirable, large-scale production characteristic is good, high degree of automation, and the cost of raw material is low
Honest and clean, development space is wide, will rapidly become the main product of new century, is the bright spot that 21 century global economy increases.
As shown in Fig. 2, for the single group goggle structure schematic diagram provided in an embodiment of the present invention for wearing eyepiece system, from system
Diaphragm at set gradually the first positive lens L1 and the second negative lens L2 to every group of eyepiece between luminescent screen.
First positive lens L1 has positive light coke, including the first surface for being convex to diaphragm and the second table for being convex to luminescent screen
Face；
Second negative lens L2 has negative power, including concaving towards the third surface of diaphragm and concaving towards the 4th table of luminescent screen
Face.
In the preferred embodiment of the present invention, the above-mentioned focal length f for wearing eyepiece system, the focal length of the first positive lens L1
f1, the focal length f of the second negative lens L22Meet following relational expressions：
f1＞ 0, f2＜ 0, f1+f2＜ 0,
Wear the overall length t of eyepiece systemtl, the thickness t of the first positive lens L11, the thickness t of the second negative lens L22Under satisfaction
State relational expression：
Wherein wear the overall length t of eyepiece systemtlBetween the first surface 21 and luminescent screen of the first positive lens L1 away from
From.
Specifically, the focal length for wearing eyepiece system is f=50mm, the focal length of the first positive lens L1 is f1=28mm, the
The focal length of two negative lens L2 is f2=-36mm；
The overall length for wearing eyepiece system is ttlThe thickness of=59mm, the first positive lens L1 are t1=18mm, second is negative
The thickness of mirror L2 is t2=8mm.
In another preferred embodiment of the present invention, the first surface 21 of the first positive lens L1 and second surface 22, second
23 and the 4th surface 24 of third surface of negative lens L2 is even aspheric surface；First positive lens L1 is plastic material, and second is negative
Positive lens L2 is glass material.The technical program is by using even aspheric surface plastic material lens, to ensure that single group eyepiece is small
Type, lightweight reduce cost, while improve image quality.
It is further preferred that the ranges of indices of refraction of the first positive lens L1 is 1.4 ＜ n1＜ 1.6, dispersion range are 50 ＜ v1＜
75；
The ranges of indices of refraction of second negative lens L2 is 1.55 ＜ n2＜ 1.8, dispersion range are 20 ＜ v2＜ 30.
Specifically, the first positive lens L1 is the plastic material of PMMA models, refractive index n1=1.491786, dispersion v1=
57.327362；
Glass materials of the second negative lens L2 for H-LAK12 models, refractive index n2=1.59, dispersion v2=29.9.
In the above-mentioned technical solutions, this, which wears eyepiece system, can reach following technical indicator：
72 ° of diagonal field of view angles, 63 ° of horizontal field of view angles；
System overall length is less than 59mm, and total weight is less than 34g；
Distance of exit pupil is 14mm；
Aberrations, the image quality such as system compensation ratio chromatism, the curvature of field, astigmatism are preferable.
Distortion and aberration of the present embodiment using positive negative lens combination correction system, by rationally designing system and each
The lens recovery system of the relationship of focal length, length and thickness between mirror and the even aspheric surface of use plastic material
Aberration ensure that ratio chromatism, the curvature of field, astigmatism etc. can thoroughly be corrected while big field angle is obtained by wearing eyepiece system
Aberration.
Another embodiment of the present invention is supplied to one kind and wears display equipment, this is worn display equipment and includes above-mentioned technology
Scheme wears eyepiece system.
Since the optical system for wearing display equipment can realize 72 ° of diagonal field of view angles, 63 ° of horizontal field of view angles and light
System overall length is less than 59mm, total weight is less than 34g, distance of exit pupil 14mm, therefore this can be made to wear display equipment and met
Miniaturization, lightweight, big visual angle the market demand.
Fig. 3 is the optical transfer function curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system, which passes
Delivery function MTF is MTF of 10 lines under.Horizontal axis represents every millimeter of demand pairs in figure, and dimensional units are lp/mm, and the longitudinal axis represents
Imaging image quality reaches the percentage of situation in kind, and from 0 to 1, optical transfer function MTF can be with concentrated expression system into image quality
Amount, the more smooth and opposite horizontal axis height of curve shape is higher (i.e. closer to 1), and the image quality of system is better；In figure respectively
The image quality under 0.000mm to 34.70mm image heights is depicted, from figure 3, it can be seen that the curve of transmission function is more smooth tight
It gathers, the mtf value that curve is characterized is very high, and the aberration of system has obtained good correction.
Fig. 4 is the curvature of field curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system, and the t lines in Fig. 4 are meridian
The curvature of field, s lines are Sagittal field curvature, and the difference of meridianal curvature of field and Sagittal field curvature is the astigmatism of system, and the curvature of field and astigmatic influence system axle
The aberration of outer field rays, difference cross the serious image quality for influencing system off-axis ray of conference.It can from Fig. 4
Go out, the curvature of field and astigmatism of this system are corrected in very low range.
Fig. 5 is the distortion aberration curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system, and distortion does not interfere with
The clarity of system, can only cause system anamorphose, and distortion can be solved by later image processing.
Fig. 6 is the point range figure provided in an embodiment of the present invention for wearing eyepiece system, and each of system is shown in point range figure
The disc of confusion that field rays are converged at image planes and formed, the system of characterizing obtain the characteristic of various differences, the RMS in point range figure
The image quality of RADIUS (root mean square radii) smaller proof system is better.Three kinds of greyscale colors represent three kinds of waves respectively in Fig. 6
The light of section, the aberration of the system of more making out a certificate of the disc of confusion of three kinds of greyscale colors point is bigger, and as can be seen from Figure 6 aberration has been
Obtain good correction.
Fig. 7 is the ratio chromatism, curve synoptic diagram provided in an embodiment of the present invention for wearing eyepiece system, and the longitudinal axis is field angle,
Horizontal axis is the difference in height of opposite green light hot spot, and unit is μm.R-curve and B curves in figure represent that feux rouges and blue light are opposite respectively
Green light (green light G lines are the longitudinal axis in figure) is poor in the delivery altitude of image planes, and the difference of R-curve and B curves is the multiplying power of system
Aberration is much smaller than 40 μm of (5.5 inches of 1440p screen single pixel rulers in Fig. 7 relative to ratio chromatism, value on each position of the longitudinal axis
Very little is 50 μm), illustrate that the aberration of this system obtains good correction.
In conclusion wear eyepiece system the invention discloses one kind and wear display equipment, it is described to wear eyepiece system
By at light path diaphragm to setting gradually the first positive lens and the second negative lens in every group of eyepiece between luminescent screen, due to
First positive lens has positive light coke, converges light while main axis outside the axis is allowed to bend towards optical axis, and second thereafter is negative
Mirror has negative focal power, residual aberration and aberration, the group of negative lens positive in this way caused by a piece of positive lens before can correcting
Close can just aberration correction reach a relatively good picture quality, again can aberration correction while ensure that big visual angle.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (8)
1. one kind wears eyepiece system, which is characterized in that the eyepiece system of wearing includes：Two groups of luminescent screen and right and left eyes
Eyepiece；At light path diaphragm the first positive lens and the second negative lens, institute are set gradually to every group of eyepiece between the luminescent screen
The first positive lens is stated as plastic material, second negative lens is glass material；
First positive lens has positive light coke, including the first surface for being convex to diaphragm and the second table for being convex to luminescent screen
Face；
Second negative lens has negative power, including concaving towards the third surface of diaphragm and concaving towards the 4th table of luminescent screen
Face；
The first surface and second surface of first positive lens, the third surface and the 4th surface of second negative lens are
Even aspheric surface；
The overall length t for wearing eyepiece systemtl, the thickness t of first positive lens1, the thickness t of the second negative lens2Meet following
Relational expression：
Wherein wear the overall length t of eyepiece systemtlFor the distance between the first surface of first positive lens and luminescent screen, institute
State the focal length f for wearing eyepiece system.
2. according to claim 1 wear eyepiece system, which is characterized in that the focal length f of first positive lens1, second is negative
The focal length f of lens2Meet following relational expressions：
3. according to claim 2 wear eyepiece system, which is characterized in that
The focal length for wearing eyepiece system is f=50mm, and the focal length of first positive lens is f1=28mm, the second negative lens
Focal length be f2=-36mm；
The overall length for wearing eyepiece system is ttl=59mm, the thickness of first positive lens is t1=18mm, second is negative
The thickness of mirror is t2=8mm.
4. eyepiece system is worn according to claim 1-3 any one of them, which is characterized in that the refraction of first positive lens
Rate ranging from 1.4 ＜ n1＜ 1.6, dispersion range are 50 ＜ v1＜ 75；
The ranges of indices of refraction of second negative lens is 1.55 ＜ n2＜ 1.8, dispersion range are 20 ＜ v2＜ 30.
5. according to claim 4 wear eyepiece system, which is characterized in that
Plastic material of first positive lens for PMMA models, refractive index n1=1.491786, dispersion v1=57.327362；
Glass material of second negative lens for H-LAK12 models, refractive index n2=1.59, dispersion v2=29.9.
6. according to claim 1 wear eyepiece system, which is characterized in that
The luminescent screen for wearing eyepiece system is 1440P, 5.5 inches of Thin Film Transistor-LCD TFT-LCD.
7. according to claim 6 wear eyepiece system, which is characterized in that the luminescent screen for wearing eyepiece system leads to
It crosses split screen technology and is divided into two sub-screens, barn door is set between two sub-screens, display respectively is schemed corresponding to the 2D of right and left eyes
Picture or 3D rendering.
8. one kind wears display equipment, which is characterized in that wears eyepiece system including claim 1-7 any one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610835992.9A CN106249399B (en) | 2015-01-26 | 2015-01-26 | One kind wears eyepiece system and wears display equipment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510039387.6A CN104614851B (en) | 2015-01-26 | 2015-01-26 | One is worn eyepiece system and wears display device |
| CN201610835992.9A CN106249399B (en) | 2015-01-26 | 2015-01-26 | One kind wears eyepiece system and wears display equipment |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510039387.6A Division CN104614851B (en) | 2015-01-26 | 2015-01-26 | One is worn eyepiece system and wears display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106249399A CN106249399A (en) | 2016-12-21 |
| CN106249399B true CN106249399B (en) | 2018-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610835992.9A Active CN106249399B (en) | 2015-01-26 | 2015-01-26 | One kind wears eyepiece system and wears display equipment |
| CN201510039387.6A Active CN104614851B (en) | 2015-01-26 | 2015-01-26 | One is worn eyepiece system and wears display device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510039387.6A Active CN104614851B (en) | 2015-01-26 | 2015-01-26 | One is worn eyepiece system and wears display device |
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| CN (2) | CN106249399B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259658A (en) * | 2015-10-30 | 2016-01-20 | 深圳市火乐科技发展有限公司 | Device and method for improving imaging quality of virtual display ocular optical system |
| CN105589194A (en) * | 2015-12-29 | 2016-05-18 | 杭州立体世界科技有限公司 | Ocular lens |
| CN107544141B (en) * | 2016-06-29 | 2019-09-10 | 深圳市掌网科技股份有限公司 | A kind of virtual reality device |
| CN106019598A (en) * | 2016-07-30 | 2016-10-12 | 深圳市盈鹏光电有限公司 | Device for eliminating VR dispersion and distortion |
| CN106526851B (en) * | 2016-09-29 | 2019-02-01 | 玉晶光电(厦门)有限公司 | Eyepiece optical system |
| US20220304570A1 (en) * | 2016-10-17 | 2022-09-29 | EyeQue Inc. | Method and Apparatus for Measuring Vision Function |
| CN106371212B (en) * | 2016-10-25 | 2019-06-14 | 深圳市原点创新有限公司 | The VR/MR optical system and VR/MR equipment of dual element convex-concave eyeglass |
| CN106405841B (en) * | 2016-11-04 | 2019-05-21 | 上海鲸特投资管理有限公司 | A kind of optical system |
| CN106501943B (en) * | 2017-01-05 | 2019-03-01 | 北京海鲸科技有限公司 | A kind of eyepiece optical system for wearing display equipment |
| CN107045196B (en) * | 2017-02-08 | 2019-07-05 | 浙江舜宇光学有限公司 | Eyepiece and display device including the eyepiece |
| CN109143570A (en) * | 2017-06-15 | 2019-01-04 | 北京海鲸科技有限公司 | A kind of eyepiece and wear display equipment |
| CN107632388B (en) | 2017-10-24 | 2024-04-02 | 歌尔光学科技有限公司 | Eyepiece and head-mounted display device |
| CN108051920B (en) * | 2017-12-30 | 2020-04-03 | 苏州科技大学 | Optical system suitable for virtual reality equipment |
| CN113050244B (en) * | 2021-03-22 | 2023-03-17 | 业成科技（成都）有限公司 | Lens assembly and display device |
| CN114839767A (en) * | 2022-03-31 | 2022-08-02 | 歌尔光学科技有限公司 | Low-distortion optical imaging adjustment method and system and head-mounted display device |
| CN114706223B (en) * | 2022-04-15 | 2023-09-19 | 青岛虚拟现实研究院有限公司 | Lens group, optical module and head-mounted display device |
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| JPH08160344A (en) * | 1994-12-05 | 1996-06-21 | Olympus Optical Co Ltd | Head mounted video display device |
| US5619373A (en) * | 1995-06-07 | 1997-04-08 | Hasbro, Inc. | Optical system for a head mounted display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204536648U (en) * | 2015-01-26 | 2015-08-05 | 青岛歌尔声学科技有限公司 | One is worn eyepiece system and is worn display device |
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- 2015-01-26 CN CN201610835992.9A patent/CN106249399B/en active Active
- 2015-01-26 CN CN201510039387.6A patent/CN104614851B/en active Active
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|---|---|---|---|---|
| JPH08160344A (en) * | 1994-12-05 | 1996-06-21 | Olympus Optical Co Ltd | Head mounted video display device |
| US5619373A (en) * | 1995-06-07 | 1997-04-08 | Hasbro, Inc. | Optical system for a head mounted display |
| WO2013027855A1 (en) * | 2011-08-25 | 2013-02-28 | リコー光学株式会社 | Eyepiece lens system and image observation device |
| CN104090354A (en) * | 2014-06-28 | 2014-10-08 | 青岛歌尔声学科技有限公司 | Chromatic-aberration-free wide-angle internally-focusing lens for head device and head device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104614851A (en) | 2015-05-13 |
| CN104614851B (en) | 2016-12-07 |
| CN106249399A (en) | 2016-12-21 |
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