The wear-type virtual reality optical system of diopter is adjusted with Fresnel lensesTechnical field
The present invention relates to a kind of optical field more particularly to a kind of wear-type adjusting diopter with Fresnel lenses are virtualReal optical system.
Background technology
Virtual reality technology (Virtual Reality, VR) technology is that a kind of utilize proposed the 1980s calculatesVision virtual environment that machine generates, can interacting, with feeling of immersion, can generate a variety of virtual environments, extensively as requiredApplied to urban planning, driving training, the fields such as indoor design.Recently as computer computation ability and all types of sensorsDevelopment, all types of virtual implementing helmets come across in the market, substantially by display screen or mobile phone and a pair of of eyepiece groupAt human eye can see the image amplified on display screen, the variation adjustment left and right display of sensor sensing head part by eyepieceImage in screen so that human eye can see three-dimensional, the visual pattern with interactivity.
Virtual display display system mostly uses greatly conventional lenses to obtain the virtual image of amplification, in design eyeglass and display at presentScreen apart from when design according to healthy eyesight crowd, for myopia or long sight crowd, it is general using the wearing spectacles before helmeting orIt is to change the method for the object distance between display screen and conventional lenses to realize that diopter is adjusted, the former can reduce feeling of immersion, increase makesUser bears a heavy burden, and the latter can cause inner helmet complicated in mechanical structure, increase production cost, this can all be caused under user experienceDrop, therefore how to realize realizing different crowd normal use virtual implementing helmet in the case of wearing spectacles at urgentlyIt solves the problems, such as.
Invention content
In order to solve the problems, such as background technology, adjusted with Fresnel lenses the purpose of the present invention is to provide a kind ofThe wear-type virtual reality optical system of diopter uses void for realizing myopia or presbyopic user in not wearing spectaclesThe purpose of the quasi- reality helmet.
To achieve the goals above, the present invention provides using following technical scheme：
The present invention includes the optical lens being fixedly mounted in virtual implementing helmet and display screen and installs with can retractingFresnel in virtual implementing helmet adds eyeglass, and optical lens and display screen are sequentially placed into front of human eye, and Fresnel is additionalEyeglass is placed between optical lens and display screen or between human eye and optical lens, and Fresnel adds eyeglass and optical lensOptical axis is conllinear.Optical lens is fixed on inner helmet and can not take out, and Fresnel adds eyeglass and can be inserted into or take out from the helmet.
Preferably, the Fresnel adds eyeglass and is placed between human eye and optical lens.
For twenty-twenty vision person, Fresnel adds the planar optics that eyeglass replaces with same thickness；For long sight or myopiaEyesight person, Fresnel, which adds eyeglass, has the focal power just or born, the diopter of focal power and the glasses of its daily wearingNumber is identical or close.
Fresnel in specific implementation, which adds eyeglass, has the focal power regulated quantity of -8D~+8D.
The Fresnel adds the Fresnel surface type of eyeglass towards against optical lens either display screen or human eye.
When Fresnel, which adds eyeglass, to be placed between human eye and optical lens, Fresnel adds the Fresnel surface type court of eyeglassTo optical lens or human eye, preferably towards optical lens, plane is towards human eye；It is placed in optics when Fresnel adds eyeglassWhen between lens and display screen, the Fresnel surface type that Fresnel adds eyeglass can be towards optical lens or display screen, preferablyBe directed towards display screen, plane is towards optical lens.
The Fresnel adds the single side or two-sided for Fresnel surface type of eyeglass.
Preferably, Fresnel adds eyeglass and uses on one side as plane, and another side is the structure of Fresnel surface type.
It at a distance from optical axis is 1mm~5mm that the Fresnel, which adds eyeglass between optical lens,.
The Fresnel adds eyeglass and is inserted vertically into from the top surface of virtual implementing helmet or from virtual implementing helmet sideFace is horizontally inserted into, and is fixed by the groove in helmet frame after insertion.
The additional eyeglass of the Fresnel is identical with the quantity of optical lens, is a piece of or two panels, eyes can be simultaneouslyIt watches a piece of or watches two panels respectively.Display screen can be one piece or two pieces.Preferably, Fresnel adds eyeglass and opticsLens are all made of two panels, and display screen is same.
The present invention may include that left and right two panels Fresnel adds eyeglass, and it is discretely to make that left and right two panels Fresnel, which adds eyeglass,It makes on different base material, or manufacture is on same base material.
The beneficial effects of the invention are as follows：
The present invention wear display equipment in the case where not increasing additive regulating mechanism, allow myopia or farsighted person byThe Fresnel that the vision condition of oneself is inserted into the corresponding number of degrees adds eyeglass, to adjust the diopter of visual system, to simplifyThe structure of the helmet, reduces the weight and cost of the helmet, user is obtained with greatly in the case of not wearing spectaclesFeeling of immersion.
1. Fresnel lenses thickness is thin, light-weight, manufacturing cost is low, since optical mirror slip has born main diopter,And the focal power very little that Fresnel lenses generate, the veiling glare of screw thread step very little, generation is also small, user's unsusceptibility to dazzleOr screw thread.
2. the material of Fresnel lenses can be different from the material of optical lens, work in coordination and may be implemented to eliminate dispersionFunction.
Description of the drawings
Fig. 1 is the mode that Fresnel of the embodiment of the present invention adds that eyeglass is inserted into the helmet.
Fig. 2 is side elevational cross-section optical structure chart in the embodiment of the present invention.
Fig. 3 is the side view that Fresnel of the present invention adds eyeglass.
Fig. 4 is that the Fresnel of two panels separation of the present invention adds eyeglass schematic diagram.
Fig. 5 is the schematic diagram that two panels of the present invention connects that integral Fresnel adds eyeglass.
Fig. 6 is the sectional structure chart of Fresnel lenses of the present invention.
Fig. 7 is the index path when twenty-twenty vision of the embodiment of the present invention 1 uses.
Fig. 8 is index path when 400 degree of myopes of the embodiment of the present invention 2 use.
Fig. 9 is index path when 400 degree of hyperopes of the embodiment of the present invention 3 use.
In figure：Fresnel adds eyeglass 1, lens 2, display screen 3, human eye 4, helmet frame 5, virtual implementing helmet 6.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment invention is further described in detail.
As shown in Figure 1, the present invention includes the lens 2 being fixedly mounted in virtual implementing helmet 6 and display screen 3 and removableThe Fresnel being mounted on taking in virtual implementing helmet 6 adds eyeglass 1, and lens 2 and display screen 3 are sequentially placed into 4 front of human eye, luxuriant and rich with fragranceNie Er adds eyeglass 1 and is placed between lens 2 and display screen 3 or between human eye 4 and lens 2, and Fresnel adds eyeglass 1 and lens2 optical axis is conllinear, makes myopia or long sight user that this virtual implementing helmet 6 can be used in the case of not wearing spectacles.
Side elevational cross-section optical texture of the present invention is as shown in Fig. 2, lens 2 are fixed on inner helmet, Bu Nengqu by helmet frame 5Go out or is moved forward and backward.Twenty-twenty vision person replaces Fresnel to add eyeglass 1 in use, eyes are located at human eye 4, using planar optics,The light sent out from display screen 3 can see image clearly after planar optics and lens 2 in human eye 4.Myopia or hyperope use shouldWhen equipment, need to be inserted into the additional eyeglass 1 of Fresnel from 5 upper opening of helmet frame, which is securable to helmet frameIn the groove of 5 bottom of frame, all imaging light sent out from display screen 3 can all enter back into after adding eyeglass 1 across FresnelHuman eye, and can have certain divergence or convergence degree when reaching human eye 4 from the light that same point is sent out on display screen 3,It is suitble to the people of myopia or long sight to use respectively.
As shown in figure 3, for several structures of Fresnel supplementary lens 1 of the present invention, the fresnel surface of Fresnel LensesSection is laciniation, and basal section can be plane or curved surface, and thickness is 1mm~3mm, but single side has luxuriant and rich with fragrance aluniteIt is Fresnel structure that structure, which can also be two sides, preferred to use one side for the single side Fresnel Lenses of plane, luxuriant and rich with fragrance in this wayNie Er lens spaces size is minimum, is easiest to manufacture, cost is minimum.Can be plane when using the Fresnel supplementary lens 1Can also be laciniation towards human eye towards human eye direction, preferably using plane towards people's the structure of the eye.
When use Fresnel add eyeglass 1 can be between human eye 4 and lens 2 or between lens 2 and display screen 3, preferablyUse be positioned between human eye 4 and lens 2.
The material of Fresnel supplementary lens 1 be generally can pressing mold production optical plastic, in order to reach elimination optical systemThe purpose of aberration preferably uses the material bigger with 2 Abbe constant gap of lens.If virtual implementing helmet 6 is not provided with pupilAway from adjustment structure, the Fresnel supplementary lenses 1 of left and right two can be made on a substrate, as shown in figure 5, otherwise needing pointMaking is opened, as shown in figure 4, preferred using the structure being fabricated separately.
As shown in fig. 6, being typical Fresnel lenses sectional structure chart, Fresnel lenses are a kind of with annular concentric circleThe lens of groove, its similar with conventional lenses has the ability for being converging or diverging with light, and thickness is very thin, its general surface faceType one side is plane, is on one side concentric annular grooves, the focal length of eyeglass is by donut width d, the high h of tooth, the angle theta 1 with bottom surfaceIt is controlled with the angle theta 2 on top.
The embodiment of the present invention is as follows：
Embodiment 1
As shown in fig. 7, the index path for normal eye when using the virtual implementing helmet 6, planar optics do not generate lightFocal power, system focal length be 40mm~50mm, relative aperture, that is, aperture be f/4~f/5.6, simple eye diagonal angles of visual field be 80 °~100 °, using low dispersion optical plastics, abbe number is 45~65, and refractive index is 1.48~1.55, and front and rear surfaces plate anti-reflection film,Eyeglass bore is 30mm~50mm, and lens thickness is 5mm~15mm.The two sides type of lens 2 is even aspheric surface, descriptionEquation is as follows：
In specific embodiment, the face type coefficient of front surface is respectively：C=-0.0054, k=-51.78, A4=6.413342E-006 A6=-3.325306E-08, A8=6.186407E-011, remaining coefficient are 0；The face type coefficient of rear surfaceRespectively c=0.000625, k=-0.75909, A4=6.828006E-006, A6=-3.956315E-08, A8=The material of 3.984756E-011, lens 2 are E48R, center thickness 8mm, bore 35mm.The material of planar optics isPOLYCARB, thickness 2mm, bore 35mm, the distance apart from human eye 4 are 8mm, are 1mm apart from lens 2, lens 2 are apart from aobvious3 centre of surface of display screen is 36.2mm, and display screen 3 is 16 that size is 5.7 inches:9 1080pOLED display screens.EntirelyThe focal length of optical system is about 40mm, and relative aperture f/4, simple eye diagonal angles of visual field is 90 °.
Embodiment 2
As shown in figure 8, replacing with the flat lenses of embodiment 1 with the light after negative power Fresnel supplementary lens 1Fig. 6 of Lu Tu, other structures and embodiment 1 are consistent, which is suitble to user's bore hole that myopia degree is 400 degree to useThe helmet, since there is human eye certain regulating power, myopia degree can also be used in 400 degree or so of near-sighted userThe helmet.The clear aperture of Fresnel supplementary lens 1 is 35mm, focal length about -560mm, apart from human eye 8mm, thickness 1mm, distanceLens 2 are 1mm.The donut spacing d of lens surface is 1mm, and tooth a height of 0.2mm, θ 1 are 6.5 °, and θ 2 is 63 °.
Embodiment 3
As shown in figure 9, replacing with the flat lenses of embodiment 1 with the light after positive light coke Fresnel supplementary lens 1Fig. 6 of Lu Tu, other structures and embodiment 1 are consistent, which is suitble to user's bore hole that hyperopia degree is 400 degree to useThe helmet, since there is human eye certain regulating power, hyperopia degree can also be used in 400 degree or so of long sight userThe helmet.The clear aperture of the Fresnel supplementary lens 1 is 35mm, focal length about 317mm, apart from human eye 8mm, thickness 1mm, distanceLens 2 are 1mm.The donut spacing d of lens surface be 3mm, a height of 0.5mm of tooth, θ 1 be 65 °, θ 2 be 5.5 °.
This programme is under the premise of keeping original helmet structure compact, the method by plugging different Fresnel supplementary lensesCome be adapted to it is different myopia or hyperopia degree users, can in the case of not wearing spectacles experiencing virtual Reality glasses,Maintain original feeling of immersion.And the thickness of Fresnel supplementary lens is thin, light-weight, and cost is very low, is suitble to extensive pressureMould produces.