CN110261996A - Imaging lens and augmented reality equipment based on digital light processing - Google Patents
Imaging lens and augmented reality equipment based on digital light processing Download PDFInfo
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- CN110261996A CN110261996A CN201910435617.9A CN201910435617A CN110261996A CN 110261996 A CN110261996 A CN 110261996A CN 201910435617 A CN201910435617 A CN 201910435617A CN 110261996 A CN110261996 A CN 110261996A
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- imaging lens
- expanding
- eyeglass
- digital light
- light processing
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses the imaging lens in the augmented reality equipment based on digital light processing, there is optical waveguide array in the augmented reality equipment, the imaging lens have extension peacekeeping non-expanding dimension；The imaging lens include at least one eyeglass, and each eyeglass is less than the width tieed up in the non-expanding in the width of the extension dimension；Object space maximum half angular aperture that the camera lens is tieed up in non-expanding meets following formula:Wherein, L is pupil of human at a distance from hithermost eyeglass in the imaging lens；FOV is field angle；ED is dynamic eye range；E is people's eye pupil bore dia；S is the focusing size of the digital light processing.It is tieed up in non-expanding, all aperture light are provided by imaging lens, digital light processing non-expanding dimension do not have overturning amount and with illumination reflecting surface it is vertical, it is not limited by digital light processing rollover characteristics, object space maximum half angular aperture for being tieed up imaging lens in non-expanding using lens combination is extended.
Description
Technical field
The present invention relates to optical fields, in particular to based on digital light processing (Digital Light Process, English
Abridge DLP) imaging lens and augmented reality (Augmented Reality, english abbreviation AR) equipment.
Background technique
AR display technology is that information is projected to human eye in a manner of the virtual image, so that virtual information is superimposed upon with actual environment
It is presented to human eye simultaneously together.Outdoors etc. under high-brightness environments, the information brightness of display directly affects user to information
It obtains, and DLP is due to the high brightness and high contrast of its projection, the problem of can solve AR display brightness.
Fig. 1 is the schematic diagram of DLP in the prior art.Each pixel is a piece of minitype reflector, which can be two
Switch between a angle value.By taking Fig. 1 as an example, for illuminating ray from light source with -24 ° of incidences, DLP imaging has following three state:
1, when reflecting mirror is overturn to towards 12 ° of light source side, illuminating ray is reflected into 0 °, flat with camera lens optical axis
Row, reflection light enters imaging optical path at this time, i.e. reflection light enters imaging lens, this state pixel is illuminating state, will
This state is known as " on " state；
2, when reflecting mirror is overturn to -12 ° of the light source other side, illuminating ray is reflected into 48 °, deviates optical axis, reflection
Light not can enter imaging optical path, i.e. reflection light not can enter imaging lens, this state pixel be it is black, this state is claimed
For " off " state；
3, in " off " state, it is 0 ° that DLP, which protects the reflecting surface normal of window, and reflection light is 24 °, reflection light at this time
Referred to as " flat " state light.
As can be seen that imaging lens, in the space (hereinafter referred to as object space) of the side DLP, angular aperture cannot be too big.Root
According to the citing of Fig. 1, imaging lens need to be less than ± 12 ° in the angular aperture of object space.But in AR application scenarios, DLP is needed to retain
While high brightness and high contrast features, imaging lens can also have biggish object space angular aperture.
Summary of the invention
The embodiment of the invention provides imaging lens and AR equipment based on DLP.It is some for the embodiment to disclosure
Aspect has a basic understanding, and simple summary is shown below.The summarized section is not extensive overview, nor to determine
Key/critical component or the protection scope for describing these embodiments.Its sole purpose is presented with simple form
Concept, in this, as the preamble of following detailed description.
In a first aspect, the imaging lens in the embodiment of the invention provides a kind of AR equipment based on DLP, the AR equipment
In have optical waveguide array, the imaging lens have extension peacekeeping non-expanding dimension；
The imaging lens include at least one eyeglass, and each eyeglass is less than in the width of the extension dimension described
The width of non-expanding dimension；
Object space maximum half angular aperture that the camera lens is tieed up in non-expanding meets following formula:
Wherein, L is pupil of human at a distance from hithermost eyeglass in the imaging lens；FOV is field angle；ED is
Eye range；E is people's eye pupil bore dia；S is the focusing size of the DLP.
Based on the imaging lens, as optional first embodiment, the imaging lens are maximum in the image space of extension dimension
Semiaperture angle meets following formula:
Wherein, E is people's eye pupil bore dia, and FOV is field angle；S is the focusing size of the digital light processing.
Based on the imaging lens, as optional second embodiment, each eyeglass is ellipsoid.
Based on the second embodiment, as optional 3rd embodiment, the quantity of the eyeglass is 3.
Based on the 3rd embodiment, as optional fourth embodiment, the eyeglass is aspherical face type；
The aspherical contour line is determined by following formula:
Wherein, c is aspherical center curvature radius；K is the constant of the cone；1~α of α 8 is asphericity coefficient；R is the eyeglass
Radial distance.
Second aspect, the embodiment of the invention provides a kind of AR equipment, the equipment include it is previously described it is any at
As camera lens.
In embodiments of the present invention, DLP illuminate reflecting surface be placed in extension dimension, due to each eyeglass extension dimension width compared with
It is small, optical waveguide array can be entered to avoid the light of flat state and off state, to will not influence contrast.It is tieed up in non-expanding, institute
There is aperture light to be provided by imaging lens, DLP non-expanding dimension do not have overturning amount and with illumination reflecting surface it is vertical, not by DLP
The limitation of rollover characteristics, object space maximum half angular aperture for being tieed up imaging lens in non-expanding using lens combination are extended.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is the schematic diagram of DLP system in the prior art；
Fig. 2 is the extension dimension schematic diagram in an exemplary embodiment in an exemplary embodiment；
Fig. 3 is the extension dimension imaging optical path in an exemplary embodiment；
Fig. 4 is the non-expanding dimension schematic diagram in an exemplary embodiment；
Fig. 5 is the non-expanding dimension equivalent schematic in an exemplary embodiment；
Fig. 6 is the light path schematic diagram that dimension is extended in an exemplary embodiment；
Fig. 7 is the light path schematic diagram of non-expanding dimension in an exemplary embodiment.
Specific embodiment
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Embodiment only represents possible variation.Unless explicitly requested, otherwise individual components and functionality is optional, and
And the sequence of operation can change.The part of some embodiments and feature can be included in or replace other embodiments
Part and feature.The range of embodiment of the present invention includes the entire scope of claims and the institute of claims
There is obtainable equivalent.Herein, each embodiment can individually or generally be indicated that this is only with term " invention "
It is merely for convenience, and if in fact disclosing the invention more than one, it is not meant to automatically limit the range of the application
For any single invention or inventive concept.Herein, relational terms such as first and second and the like are used only for one
Entity, which is perhaps operated, to be distinguished and exists without requiring or implying between these entities or operation with another entity or operation
Any actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method or equipment not only include those elements, but also including
Other elements that are not explicitly listed.Each embodiment herein is described in a progressive manner, and each embodiment stresses
Be the difference from other embodiments, the same or similar parts in each embodiment may refer to each other.For implementing
For structure, product etc. disclosed in example, since it is corresponding with part disclosed in embodiment, so being described relatively simple, phase
Place is closed referring to method part illustration.
The characteristics of optical waveguide array used in AR equipment is one-dimensional emergent pupil extension, it is possible thereby to which imaging lens are divided into expansion
It opens up peacekeeping non-expanding and ties up two dimensions.Fig. 2 is the extension dimension schematic diagram in an exemplary embodiment, and Fig. 3 is an exemplary implementation
Imaging optical path is tieed up in extension in example, and Fig. 4 is the non-expanding dimension schematic diagram in an exemplary embodiment, and Fig. 5 is an exemplary implementation
Non-expanding in example ties up equivalent schematic.
As shown in Figures 2 and 3, optical waveguide array has array light splitting surface, each light splitting surface part reflection in emergent pupil extension dimension
Fractional transmission.Optical waveguide array couple entrance pupil at light beam aperture very little, by array light splitting surface by light beam aperture duplication, extension and
Decoupling, the light of decoupling are much larger than the entrance pupil of human eye, can receive the light from image source human eye is mobile.
As shown in Figure 4 and Figure 5, the array light splitting surface of optical waveguide array non-expanding dimension is unable to copying beam aperture, light splitting surface
It is equivalent to reflecting mirror, therefore optical waveguide array can be equivalent to the optical interval of long range in non-expanding dimension.Position of human eye is
For entrance pupil position, big object space angular aperture is just needed in order to which projected light beam is covered human eye.
In an exemplary embodiment, imaging lens in the AR equipment based on DLP have optical waveguide battle array in AR equipment
Column, imaging lens have extension peacekeeping non-expanding dimension.
Imaging lens include at least one eyeglass, and each eyeglass is less than the width tieed up in non-expanding in the width of extension dimension.
Object space maximum half angular aperture that imaging lens are tieed up in non-expanding meets following formula one:
Wherein, L is pupil of human at a distance from eyeglass hithermost in imaging lens；FOV is field angle；ED is dynamic eye model
It encloses；E is people's eye pupil bore dia；S is the focusing size of DLP.
According to above-mentioned formula one, object space maximum half angular aperture that imaging lens are tieed up in non-expanding can achieve 32.5 °.
By taking imaging lens include 3 eyeglasses as an example, Fig. 6 is the light path schematic diagram that dimension is extended in an exemplary embodiment, Fig. 7
The light path schematic diagram tieed up for non-expanding in an exemplary embodiment.DLP illumination reflecting surface is placed in extension dimension, since each eyeglass exists
The width for extending dimension is smaller, can enter optical waveguide array to avoid the light of flat state and off state, to will not influence comparison
Degree.Tieed up in non-expanding, all aperture light provide by imaging lens, DLP non-expanding dimension do not have overturning amount and with illumination it is anti-
It is vertical to penetrate face, is not limited by DLP rollover characteristics, the object space maximum half bore for being tieed up imaging lens in non-expanding using lens combination
Diameter angle is extended.
Further, optionally, as shown in figure 3, imaging lens only need covering light in maximum half angular aperture of the image space of extension dimension
Waveguide array inlet couples the size of entrance pupil, and the size of optical waveguide array entrance is pupil of human diameter E.Extension dimension
Maximum half angular aperture of image space meets following formula two:
Wherein, FOV is field angle；S is the focusing size of the DLP.
Further, optionally, each eyeglass in imaging lens can be set to oblong.The imaging lens that Fig. 7 is provided
Eyeglass, each eyeglass including 3 aspherical face types are oblong.The aspherical profile line of eyeglass shown in fig. 7 meets
Following formula three:
Wherein, c is aspherical center curvature radius, and k is the constant of the cone, α1~α8For asphericity coefficient, r is that eyeglass is radial
Distance.
It should be understood that the invention is not limited to the process and structure that are described above and are shown in the accompanying drawings,
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is only limited by the attached claims
System.
Claims (6)
1. the imaging lens in a kind of augmented reality equipment based on digital light processing, there is light wave in the augmented reality equipment
Array is led, the imaging lens have extension peacekeeping non-expanding dimension；It is characterized by: the imaging lens include at least one mirror
Piece, each eyeglass are less than the width tieed up in the non-expanding in the width of the extension dimension；
Object space maximum half angular aperture that the camera lens is tieed up in non-expanding meets following formula:
Wherein, L is pupil of human at a distance from hithermost eyeglass in the imaging lens；FOV is field angle；ED is dynamic eye model
It encloses；E is people's eye pupil bore dia；S is the focusing size of the digital light processing.
2. imaging lens as described in claim 1, which is characterized in that image space maximum half bore of the imaging lens in extension dimension
Diameter angle meets following formula:
Wherein, E is people's eye pupil bore dia, and FOV is field angle；S is the focusing size of the digital light processing.
3. imaging lens as described in claim 1, which is characterized in that each eyeglass is ellipsoid.
4. imaging lens as claimed in claim 3, which is characterized in that the quantity of the eyeglass is 3.
5. imaging lens as claimed in claim 4, which is characterized in that the eyeglass is aspherical face type；It is described aspherical
Contour line is determined by following formula:
Wherein, c is aspherical center curvature radius；K is the constant of the cone；1~α of α 8 is asphericity coefficient；
R is the radial distance of the eyeglass.
6. a kind of augmented reality equipment, which is characterized in that the equipment includes such as imaging described in any one of claim 1 to 5
Camera lens.
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| CN201910435617.9A CN110261996B (en) | 2019-05-23 | 2019-05-23 | Imaging lens and augmented reality equipment based on digital light processing |
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| CN201910435617.9A CN110261996B (en) | 2019-05-23 | 2019-05-23 | Imaging lens and augmented reality equipment based on digital light processing |
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| CN110261996B CN110261996B (en) | 2022-01-11 |
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