CN110031971A - A kind of wide angle optical free surface lens and its assembling technique being assembled into - Google Patents
A kind of wide angle optical free surface lens and its assembling technique being assembled into Download PDFInfo
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- CN110031971A CN110031971A CN201910360159.7A CN201910360159A CN110031971A CN 110031971 A CN110031971 A CN 110031971A CN 201910360159 A CN201910360159 A CN 201910360159A CN 110031971 A CN110031971 A CN 110031971A
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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
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/10—Mirrors with curved faces
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Abstract
The present invention provides a kind of wide angle optical free surface lens and its assembling technique being assembled into.The assembling technique includes the following steps: the first step, and Machining Free-Form Surfaces reflect sub- eyeglass；Second step, building imaging optical texture；Third step, installation free form surface reflect sub- eyeglass；4th step installs camera lens structure and image analysis software；5th step is calculated the mtf value that the striped of specific frequency of the corresponding ROI of sub- eyeglass is reflected with free form surface by image analysis software parallel parsing, is reflected sub- eyeglass to free form surface and is carried out 6 dimension positions and adjusts；The sub- eyeglass splicing of multiple free form surfaces reflection is fixed into an Integrated lens by the 6th step.The wide angle optical free surface lens are assembled using multiple sub- eyeglasses, and machining eyeglass difficulty substantially reduces, and save cost, are suitable for augmented reality new line display optical system.
Description
Technical field
The present invention relates to optics display technology, in particular to a kind of wide-angle using assembling technique, easy to process, at low cost
Freeform optics surface eyeglass and its assembling technique.
Background technique
It is currently used for the optical system of the augmented reality new line display of automobile, the main free form surface for passing through multi-disc large area
Reflecting optics, the new line that can be realized larger field angle show, allow driver accomplish to see not bowing, not rotary head it is larger
The image of lateral angles, regulation of longitudinal angle, such optical system for coming back display mainly includes image device, directional scattering piece, more
The off-axis free-form surface mirror piece of piece, windshield, eye-observation window, since the new line of larger field angle to be realized is aobvious
Show, it is desirable that relatively large sized, the field of view angle of such as 20 degree of realization or more, using two panels of off-axis free-form surface mirror piece
Off-axis free-form surface mirror piece, size is respectively 200mmx100mm, 420mmx200mm.
Currently, this large area free surface lens difficulty of processing is very big, the above machining of 5 axis is needed, so that cost is non-
Chang Gao.
Summary of the invention
The purpose of the present invention is the large area free form surfaces for the optical system currently used for augmented reality new line display
The deficiency that machining eyeglass difficulty is big, cost is high provides a kind of wide angle optical free surface lens and its assembling technique being assembled into,
The wide angle optical free surface lens are assembled using multiple sub- eyeglasses, and machining eyeglass difficulty substantially reduces, and save cost, fit
For augmented reality new line display optical system.
In order to solve above-mentioned prior art problem, the technical scheme is that
A kind of assembling technique of wide angle optical free surface lens, the assembling technique include the following steps:
The first step, Machining Free-Form Surfaces reflect sub- eyeglass, are first determined for compliance with setting for the large area free-form surface mirror piece of requirement
Parameter is counted, the free form surface for then marking off multiple array distributions according to the design parameter of large area free-form surface mirror piece is anti-
It penetrates sub- eyeglass and determines its design parameter respectively, then processed and come from respectively according to the design parameter that free form surface reflects sub- eyeglass
By the sub- eyeglass of camber reflection；
Optical texture is imaged in second step, building, and the image optics structure, which preferably comes back, shows optical texture, and described come back shows
Show that optical texture includes image input interface, orientation diffraction plate, the first off-axis free-form surface mirror piece, the second off-axis freely song
Face reflecting optics, at virtual image glass, eye-observation window, virtual image position, the orientation diffraction plate is as relaying image planes, the figure
As input interface image light by the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror piece according to
The angle projection imaging light beam of design is at virtual image glass, then by virtual image glass-reflected some light to eye-observation window
Mouthful, so that human eye is seen the virtual image in front；
Third step, installation free form surface reflect sub- eyeglass, and second in the image optics structure of second step building is off-axis freely
Camber reflection eyeglass replaces with multiple free form surfaces in the first step and reflects sub- eyeglass, the free form surface reflect sub- eyeglass according to
Position in the first step in large area free-form surface mirror piece design parameter is arranged, and the free form surface is reflected sub- mirror
Piece is separately connected a precise motion mechanism, and the precise motion mechanism includes at least X-axis walking module, Y-axis walking module, Z axis
Walking module and using X-axis as the X-axis rotating module of shaft and using Y-axis as the Y-axis rotating module of shaft and using Z axis as shaft
Z axis rotating module, by precise motion, mechanism is driven, and free form surface, which reflects sub- eyeglass, can be carried out the spatial position adjustment of 6 dimensions；
4th step installs camera lens structure and image analysis software, the human eye in the image optics structure of second step building
Camera lens structure is installed in watch window position, and the camera lens structure is used to that human eye to be replaced to receive the virtual image, the camera mirror
Header structure connects computer by data line, and the computer is equipped with image analysis software；
5th step reflects sub- eyeglass to free form surface and carries out the adjustment of 6 dimension positions, first passes through image input interface and input a spy
Determine the transverse and longitudinal stripe pattern of spatial frequency, the transverse and longitudinal stripe pattern includes multiple transverse and longitudinal striped subgraphs, the transverse and longitudinal striped
The layout of subgraph is identical as the layout that free form surface reflects sub- eyeglass, and multiple transverse and longitudinal striped subgraphs are respectively by corresponding position
The free form surface set reflects sub- lens reflecting and at the virtual image, receives the virtual image by camera lens structure and the virtual image is sent to calculating
Machine carries out image analysis to the virtual image by image analysis software, and described image analyzes software can be according to the display information of the virtual image and oneself
The virtual image is divided into multiple ROI corresponding with the free form surface eyeglass of reflection respectively by the position of the sub- eyeglass of camber reflection, then
The mtf value that the striped of the specific frequency of each ROI is calculated by image analysis software parallel parsing adjusts freely bent according to mtf value
6 dimensional space positions of sub- eyeglass are reflected in face, when all mtf values reach design object value, then determine free form surface reflection
Eyeglass has been assembled to position；
The sub- eyeglass splicing of the good multiple free form surfaces reflection of 5th successive step is fixed into an Integrated lens by the 6th step, is obtained
The wide angle optical free surface lens being assembled into.
The technical principle of 5th step is as follows:
All free form surfaces, which reflect the spatial position of sub- eyeglass and space angle, will affect the sub- eyeglass of free form surface reflection and is being imaged
Show the loss of image quality of the virtual image obtained in structure, and free form surface reflects sub- eyeglass character pair imaging region, side of the present invention
Case determines that free form surface reflects the loss of image quality degree of the imaging system of sub- eyeglass by mtf value, when mtf value reaches requirement simultaneously
When consistent, i.e., judgement free form surface reflect sub- eyeglass loss of image quality degree it is consistent, at this moment free form surface reflects the sky of sub- eyeglass
Between position consistency before large area free-form surface mirror piece divides in position and space angle and the first step, and then determine all
Free form surface reflects sub- eyeglass and is assembled into satisfactory large area free-form surface mirror piece.
The calculation method of mtf value includes: in 5th step
The present invention program is calculated using physical theory, and the assembling technique further includes several necessary image filtering processes, institute
State MTF calculation formula are as follows:
MTF=(Imax)/(+)；
The MTF mainly calculates the tolerance of the fringe gray level value of the virtual image, wherein Imax is bright fringes corresponding grey scale value, is
Dark fringe corresponding grey scale value, a fringe period include a bright fringes, that is, white stripes and a dark fringe, that is, blackstreak.
In the first step, the quantity of the sub- eyeglass of free form surface is preferably 4,6,9；
Further, the 5th step further includes the mtf value to the multiple ROI of Fringe Acquisition of the sub- image lenses of single free form surface,
That is a sub- eyeglass of free form surface is detected by the mtf value of multiple ROI, then above and below, left and right, the mtf value being diagonally distributed
The characteristics of adjust the 6 dimensional space positions that single free form surface reflects sub- eyeglass, further promote free form surface and reflect sub- mirror
The precision of piece active alignment.
A kind of wide angle optical free surface lens being assembled into, it includes the sub- eyeglass of free form surface of multiple array distributions, multiple
The sub- eyeglass of free form surface is assembled into the wide angle optical free surface lens using assembling technique as described above；
Further, new line display optical system is made of the wide angle optical free surface lens, the new line shows optical system
System include one or two image input interface and orientation diffraction plate and the first off-axis free-form surface mirror piece and second from
Axis free-form surface mirror piece and at virtual image glass and eye-observation window and virtual image position, the orientation diffraction plate conduct
Relay image planes, the wide angle optical free surface lens being assembled into described in the first off-axis free-form surface mirror piece use, institute
The image light for stating image input interface passes through the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror piece
According to the angle projection imaging light beam of design at virtual image glass, then by being seen at virtual image glass-reflected some light to human eye
Window is examined, human eye is enable to see one or two virtual image in front.
A kind of wide angle optical free surface lens being assembled into of the present invention and its assembling technique, its advantages have:
1, large area free surface lens the relatively small multiple sub- eyeglasses of free form surface of area are divided into process, so that
Free surface lens difficulty of processing substantially reduces, and saves cost；
2, due to using assembling technique, can assembled any large area free surface lens, be suitable for wide-angle and come back display structure
Demand to large area free surface lens；
3, using 6 dimension precise motion mechanisms, assembly precision in position is high.
Detailed description of the invention:
Fig. 1, for a kind of structural schematic diagram of the image optics structure of the assembling technique of wide angle optical free surface lens of the present invention；
Fig. 2, for the camera lens structure and free form surface of a kind of assembling technique of wide angle optical free surface lens of the present invention
The light path schematic diagram for (omitting image optics structure) between eyeglass；
Fig. 3 is a kind of structural schematic diagram for the wide angle optical free surface lens being assembled into of the present invention；
Fig. 4, for a kind of transverse and longitudinal stripe pattern of the assembling technique input of wide angle optical free surface lens of the present invention；
Fig. 5, for a kind of virtual image figure of the transverse and longitudinal stripe pattern of the assembling technique input of wide angle optical free surface lens of the present invention
Picture；
Fig. 6 is a kind of assembling technique of wide angle optical free surface lens of the present invention to the sub- image lenses of single free form surface
The schematic diagram of the multiple ROI of Fringe Acquisition；
Fig. 7, for a kind of collected candy strip of camera of the assembling technique of wide angle optical free surface lens of the present invention.
Specific embodiment:
Below with reference to embodiment, the invention will be further described:
Embodiment:
In the present embodiment, wide angle optical free surface lens are divided into for a kind of assembling technique of wide angle optical free surface lens
The sub- eyeglass of four free form surfaces is assembled, and the assembling technique specifically comprises the following steps:
The first step, Machining Free-Form Surfaces reflect sub- eyeglass, are first determined for compliance with setting for the large area free-form surface mirror piece of requirement
Parameter is counted, the free form surface for then marking off four array distributions according to the design parameter of large area free-form surface mirror piece is anti-
It penetrates sub- eyeglass and determines its design parameter respectively, then processed and come from respectively according to the design parameter that free form surface reflects sub- eyeglass
By camber reflection eyeglass 100a, 100b, 100c, 100d；
Second step, building imaging optical texture, such as Fig. 1, the image optics structure are the display optical texture that comes back, the new line
Display optical texture includes that image input connects 1, orientation diffraction plate 2, the first off-axis free-form surface mirror piece 3, second off axis certainly
By camber reflection eyeglass 4, at virtual image glass 5, eye-observation window 6, virtual image position 7, the orientation diffraction plate conduct relaying picture
The image light in face, described image input interface is anti-by the first off-axis free-form surface mirror piece, the second off-axis free form surface
Eyeglass is penetrated according to the angle projection imaging light beam of design at virtual image glass, then by arriving at virtual image glass-reflected some light
Eye-observation window enables human eye to see the virtual image in front；
Third step, installation free form surface reflect sub- eyeglass, and second in the image optics structure of second step building is off-axis freely
Camber reflection eyeglass 4 replaces with four free form surfaces in the first step and reflects sub- eyeglass 100a, 100b, 100c, 100d, it is described from
It is arranged by the sub- eyeglass of camber reflection according to the position in the first step in large area free-form surface mirror piece design parameter, it will
The free form surface reflects sub- eyeglass and is separately connected a precise motion mechanism, and the precise motion mechanism walks including at least X-axis
Module, Y-axis walking module, Z axis walking module and using X-axis as the X-axis rotating module of shaft and using Y-axis as the Y-axis of shaft turn
Dynamic model block and using Z axis as the Z axis rotating module of shaft, by precise motion, mechanism is driven, and free form surface, which reflects sub- eyeglass, can be carried out
The spatial position adjustment of 6 dimensions (x, y, z, θ x, θ y, θ z)；
4th step installs camera lens structure 8 and image analysis software, such as Fig. 2, in the image optics structure of second step building
Eye-observation the window's position install camera lens structure, the camera lens structure be used for replace human eye receive the virtual image, it is described
Camera lens structure connects computer 9 by data line, and the computer is equipped with image analysis software；
5th step reflects sub- eyeglass to free form surface and carries out the adjustment of 6 dimension positions, first passes through image input interface and input a spy
Determine the transverse and longitudinal stripe pattern of spatial frequency, such as Fig. 4, the transverse and longitudinal stripe pattern includes multiple transverse and longitudinal striped subgraphs, the cross
The layout of vertical stripe subgraph is identical as the layout that free form surface reflects sub- eyeglass, such as Fig. 5, four transverse and longitudinal striped subgraphs
Sub- lens reflecting reflected by the free form surface of corresponding position respectively and at the virtual image, the virtual image is received by camera lens structure and by the virtual image
It is sent to computer, image analysis is carried out to the virtual image by image analysis software, described image analyzes software can be according to the aobvious of the virtual image
Show that information and free form surface reflect the position of sub- eyeglass and the virtual image is divided into four to reflect sub- eyeglass with free form surface respectively corresponding
ROI, the mtf value of the striped of the specific frequency of each ROI is then calculated by image analysis software parallel parsing, according to mtf value
The 6 dimensional space positions that adjustment free form surface reflects sub- eyeglass then determine freedom when all mtf values reach design object value
The sub- eyeglass of camber reflection has been assembled to position；
The sub- eyeglass splicing of the good multiple free form surfaces reflection of 5th successive step is fixed into an Integrated lens by the 6th step, is obtained
The wide angle optical free surface lens being assembled into.
MTF calculation formula in 5th step are as follows:
MTF=(Imax)/(+)；
Wherein, Imax is bright fringes corresponding grey scale value, is dark fringe corresponding grey scale value, and a fringe period includes one bright
Striped, that is, white stripes and a dark fringe, that is, blackstreak.
Assuming that the data that camera is 8 acquire, maximum bright fringes corresponding grey scale value is Imax=255, maximum dark fringe corresponding grey scale
For Imin=0, the not no mtf value of the ideal striped of loss of image quality in this way
=(Imax-Imin)/(Imax+Imin)=(255-0)/(255+0)=1, theoretically the contrast of original image is 1, right
It is 1 than topology degree maximum value, because having loss, generally less than 1 in image definition transmission process.
Such as Fig. 7, after primative streak pattern is transmitted by eyeglass, the collected candy strip of camera, the item of some ROI of image
Line grey scale curve is as follows:
We can calculate the contrast of this ROI, be calculated by noise filtering, it is assumed that we obtain I_max=115, I_
The contrast of min=82.=(I_max-I_min)/(I_max+I_min)=(115-82)/(115+82)=0.168.
It is as follows that process is specifically adjusted in 5th step:
(1), such as adjustment free form surface reflects the position of sub- eyeglass 100a, when free form surface reflects corresponding to sub- eyeglass 100a
When the MTF of ROI is less than set target value, adjustment free form surface reflects the position of sub- eyeglass 100a, such as adjusts X-axis position, process
It is as follows: to increase X axis coordinate value, then calculate mtf value, if mtf value reduces, need to reduce X axis coordinate value, in this way by more
X axis coordinate value when mtf value maximum is found in secondary adjustment；Y axis coordinate value, Z axis coordinate value, X-axis corner, Y-axis is similarly adjusted to turn
Angle, Z axis corner；When 6 dimension positions adjust to obtain maximum mtf value；
(2), the maximum mtf value in step (1) is set as target value, similarly adjusts free form surface and reflects sub- eyeglass
The 6 dimension positions of 100b, 100c, 100d.
Such as Fig. 6, the 5th step further includes the mtf value to the multiple ROI of Fringe Acquisition of the sub- image lenses of single free form surface, i.e.,
One sub- eyeglass of free form surface detected by the mtf value of multiple ROI, then according to up and down, left and right, the mtf value being diagonally distributed
Feature adjusts the 6 dimensional space positions that single free form surface reflects sub- eyeglass, further promotes free form surface and reflects sub- eyeglass
The precision of active alignment.
Such as Fig. 3, a kind of wide angle optical free surface lens 100 being assembled into, it includes free form surface of four array distributions
Eyeglass 100a, 100b, 100c, 100d, four sub- eyeglasses of free form surface are assembled into described wide using assembling technique as described above
Angle freeform optics surface eyeglass；
Further, new line display optical system is made of the wide angle optical free surface lens, the new line shows optical system
System includes that an image input interface and orientation diffraction plate and the first off-axis free-form surface mirror piece and second are off-axis free
Camber reflection eyeglass and at virtual image glass and eye-observation window and virtual image position, the orientation diffraction plate is as relaying picture
Face, the first off-axis free-form surface mirror piece use described in the wide angle optical free surface lens that are assembled into, described image
The image light of input interface is by the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror piece according to setting
The angle projection imaging light beam of meter is at virtual image glass, then by virtual image glass-reflected some light to eye-observation window
Mouthful, so that human eye is seen a virtual image in front.
The new line display optical system can be realized 20 degree or more of visual field by the free-form surface mirror of 2 large area
Angle, the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror chip size be respectively 200mmx100mm,
420mmx200mm。
Described image input interface can be laser light source shaping and get to a miniature high-speed oscillating mirror, be also possible to
The display chips such as Miro-LED, OLED, LBS and LCD.
The above has been described in detail, described above, is only a preferred embodiment of the present invention, when cannot limit
The scope of the present invention, i.e., all increases and decreases or replacement according to the made general technology means of the application range, should still belong to culvert of the present invention
Within the scope of lid.
Claims (10)
1. a kind of assembling technique of wide angle optical free surface lens, which is characterized in that the assembling technique includes the following steps:
The first step, Machining Free-Form Surfaces reflect sub- eyeglass；
Second step, building imaging optical texture；
Third step, installation free form surface reflect sub- eyeglass, by free form surface reflect that sub- eyeglass is installed to that second step is built at
As optical texture optical path in, the free form surface is reflected into sub- eyeglass and is separately connected a precise motion mechanism, the accurate fortune
Motivation structure include at least X-axis walking module, Y-axis walking module, Z axis walking module and using X-axis as the X-axis rotating module of shaft,
And using Y-axis as the Y-axis rotating module of shaft and using Z axis as the Z axis rotating module of shaft；
4th step installs camera lens structure and image analysis software；
5th step reflects sub- eyeglass to free form surface and carries out the adjustment of 6 dimension positions, first passes through image input interface and input a spy
Determine the transverse and longitudinal stripe pattern of spatial frequency, the transverse and longitudinal stripe pattern includes multiple transverse and longitudinal striped subgraphs, the transverse and longitudinal striped
The layout of subgraph is identical as the layout that free form surface reflects sub- eyeglass, and multiple transverse and longitudinal striped subgraphs are respectively by corresponding position
The free form surface set reflects sub- lens reflecting and at the virtual image, receives the virtual image by camera lens structure and the virtual image is sent to calculating
Machine carries out image analysis to the virtual image by image analysis software, and described image analyzes software can be according to the display information of the virtual image and oneself
The virtual image is divided into multiple ROI corresponding with the free form surface eyeglass of reflection respectively by the position of the sub- eyeglass of camber reflection, then
The mtf value that the striped of the specific frequency of each ROI is calculated by image analysis software parallel parsing adjusts freely bent according to mtf value
6 dimensional space positions of sub- eyeglass are reflected in face, when all mtf values reach design object value, then determine free form surface reflection
Eyeglass has been assembled to position；
The sub- eyeglass splicing of the good multiple free form surfaces reflection of 5th successive step is fixed into an Integrated lens by the 6th step, is obtained
The wide angle optical free surface lens being assembled into.
2. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
One step includes: the design parameter for being first determined for compliance with the large area free-form surface mirror piece of requirement, then according to large area freedom
The free form surface that the design parameter of camber reflection eyeglass marks off multiple array distributions reflects sub- eyeglass and determines its design respectively
Then parameter processes free form surface according to the design parameter that free form surface reflects sub- eyeglass respectively and reflects sub- eyeglass, it is described from
Quantity by the sub- eyeglass of curved surface is preferably 4,6,9.
3. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
Two steps include: the image optics structure preferably new line display optical texture, and the new line shows that optical texture includes image
Input interface, orientation diffraction plate, the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror piece, at the virtual image
Glass, eye-observation window, virtual image position, the orientation diffraction plate is as relaying image planes, the image of described image input interface
Light is projected to by the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror piece according to the angle of design
As light beam is at virtual image glass, then by, to eye-observation window, human eye being enable to see at virtual image glass-reflected some light
One virtual image in front.
4. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
Three steps further include: the second off-axis free-form surface mirror piece in the image optics structure of second step building is replaced with into the first step
In multiple free form surfaces reflect sub- eyeglass, it is anti-according to large area free form surface in the first step that the free form surface reflects sub- eyeglass
The position penetrated in lens design parameters is arranged, and by precise motion, mechanism is driven, and free form surface, which reflects sub- eyeglass, can be carried out 6 dimensions
The spatial position adjustment of degree.
5. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
Four steps include: that eye-observation the window's position in the image optics structure of second step building installs camera lens structure, described
Camera lens structure is used to that human eye to be replaced to receive the virtual image, and the camera lens structure connects computer, the meter by data line
Calculation machine is equipped with image analysis software.
6. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
The technical principle of five steps is as follows:
All free form surfaces, which reflect the spatial position of sub- eyeglass and space angle, will affect the sub- eyeglass of free form surface reflection and is being imaged
Show the loss of image quality of the virtual image obtained in structure, and free form surface reflects sub- eyeglass character pair imaging region, side of the present invention
Case determines that free form surface reflects the loss of image quality degree of the imaging system of sub- eyeglass by mtf value, when mtf value reaches requirement simultaneously
When consistent, i.e., judgement free form surface reflect sub- eyeglass loss of image quality degree it is consistent, at this moment free form surface reflects the sky of sub- eyeglass
Between position consistency before large area free-form surface mirror piece divides in position and space angle and the first step, and then determine all
Free form surface reflects sub- eyeglass and is assembled into satisfactory large area free-form surface mirror piece.
7. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
The calculation method of mtf value includes: in five steps
The present invention program is calculated using physical theory, and the assembling technique further includes several necessary image filtering processes, institute
State MTF calculation formula are as follows:
MTF=(Imax)/(+)；
The MTF mainly calculates the tolerance of the fringe gray level value of the virtual image, wherein Imax is bright fringes corresponding grey scale value, is
Dark fringe corresponding grey scale value, a fringe period include a bright fringes, that is, white stripes and a dark fringe, that is, blackstreak.
8. a kind of assembling technique of wide angle optical free surface lens according to claim 1, which is characterized in that described
Five steps further include the mtf value to the multiple ROI of Fringe Acquisition of the sub- image lenses of single free form surface, i.e. a sub- mirror of free form surface
Piece is detected by the mtf value of multiple ROI, then according to up and down, left and right, diagonally be distributed mtf value the characteristics of come adjust it is single certainly
By 6 dimensional space positions of the sub- eyeglass of camber reflection, the precision that free form surface reflects sub- eyeglass active alignment is further promoted.
9. a kind of wide angle optical free surface lens being assembled into, it includes the sub- eyeglass of free form surface of multiple array distributions, more
A sub- eyeglass of free form surface is assembled into the wide angle optical freedom using assembling technique as claimed in any one of claims 1 to 8
Curve lens.
10. a kind of wide angle optical free surface lens being assembled into according to claim 1, which is characterized in that by described
Wide angle optical free surface lens constitute new line display optical system, and the new line display optical system includes one or two figure
As input interface and orientation diffraction plate and the first off-axis free-form surface mirror piece and the second off-axis free-form surface mirror
Piece and at virtual image glass and eye-observation window and virtual image position, the orientation diffraction plate is as relaying image planes, and described first
The wide angle optical free surface lens being assembled into described in off-axis free-form surface mirror piece use, the figure of described image input interface
As light is projected by the first off-axis free-form surface mirror piece, the second off-axis free-form surface mirror piece according to the angle of design
Imaging beam is at virtual image glass, then by, to eye-observation window, human eye being enable to see at virtual image glass-reflected some light
To one or two virtual image in front.
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