CN114705396B - Prism refraction optical system for full-view field characteristic sampling detection - Google Patents
Prism refraction optical system for full-view field characteristic sampling detection Download PDFInfo
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- CN114705396B CN114705396B CN202210174560.3A CN202210174560A CN114705396B CN 114705396 B CN114705396 B CN 114705396B CN 202210174560 A CN202210174560 A CN 202210174560A CN 114705396 B CN114705396 B CN 114705396B
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- 238000005070 sampling Methods 0.000 title claims abstract description 45
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- 238000003384 imaging method Methods 0.000 claims abstract description 37
- 210000001747 pupil Anatomy 0.000 claims abstract description 10
- 230000000007 visual effect Effects 0.000 claims description 3
- 239000005357 flat glass Substances 0.000 claims description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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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
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Abstract
The invention discloses a prism refraction optical system for full-view-field characteristic sampling detection, which comprises a prism module, an imaging receiving lens and a camera photosurface, wherein the prism module, the imaging receiving lens and the camera photosurface are sequentially arranged along an optical path behind an exit pupil, the prism module comprises a plurality of prisms which surround an optical axis and correspond to a preset characteristic sampling view-field point, a light beam to be detected of the preset characteristic sampling view-field point enters the same imaging receiving lens after being refracted by the corresponding prisms and is focused on the same camera photosurface for imaging, and the main light ray of the light beam to be detected is reflected by the prism reflecting surface and then is opposite to the angle theta of the optical axis 2 Angle θ of prism reflecting surface relative to optical axis 3 And the angle theta of each preset characteristic sampling view field point relative to the optical axis 1 The relation of (2) is:. The invention adopts the prism module to turn the light beam to be detected of the full-view field characteristic sampling point to image on the same camera photosurface through the same imaging receiving lens, avoids the interference between the testing module and the glasses leg, and has simple structure, compact volume and low cost.
Description
Technical Field
The invention relates to light path sampling detection, in particular to a prism refraction optical system for full-view field characteristic sampling detection.
Background
Along with the light weight and miniaturization of the system module, the interval between an exit pupil area enveloped by an eye box and an entrance pupil is smaller and smaller, the entrance pupil is generally positioned at the front end of a projection module arranged in an AR glasses leg, the nearest distance between the glasses leg and the eye box is even shortened to 15-18 mm, and certain difficulty is brought to the detection of the performance of the whole AR glasses.
The detection of the performance of the whole AR glasses can be divided into full-view coverage or 9 characteristic test points are taken in full-view space according to an ANSI 9 point test method; the front end of the lens has larger outer diameter and is interfered with the AR glasses legs although the front end can cover the whole angle of view by means of the conical glasses lens; the latter takes 9 characteristic test points in the whole view field space according to an ANSI test method, generally, 9 receiving lens camera modules are needed, and the whole detection equipment is large in size and high in cost.
Disclosure of Invention
The invention aims to: the invention aims to provide a prism refraction optical system for full-view field feature sampling detection, which solves the problems of complex structure, large volume, difficult assembly and adjustment and high cost caused by the fact that a plurality of receiving lenses and camera modules are needed for full-view field feature test by using one prism module, one imaging receiving lens and one camera photosurface.
The technical scheme is as follows: the invention relates to a prism refraction optical system for full-view-field characteristic sampling detection, which comprises a prism module, an imaging receiving lens and a camera photosurface, wherein the prism module, the imaging receiving lens and the camera photosurface are sequentially arranged along an optical path behind an exit pupil, the prism module comprises a plurality of prisms which surround an optical axis and correspond to a preset characteristic sampling view-field point, a light beam to be detected of the preset characteristic sampling view-field point enters the same imaging receiving lens after being refracted by the corresponding prisms and is focused on the same camera photosurface for imaging, and the main light ray of the light beam to be detected is reflected by the prism reflecting surface and then is opposite to the angle theta of the optical axis 2 Angle θ of prism reflecting surface relative to optical axis 3 And the angle theta of each preset characteristic sampling view field point relative to the optical axis 1 The relation of (2) is:。
preferably, the preset feature sampling field point includes a central field point A0, off-axis field points B1 to B6 and off-axis field points C1 to C2 on the optical axis Z, wherein the off-axis field point B1 and the off-axis field point B4 are located in the same cross section, and the off-axis field point B2 and the off-axis field point B3 are located in the same cross sectionThe on-axis and off-axis field point B5 and B6 are located in the same cross section, and the off-axis field point C1 and C2 are located in the same cross section, whereinAlpha is the component of the characteristic sample field point angle of view in the Y direction, and beta is the component of the characteristic sample field point angle of view in the X direction.
In order to avoid overlapping of sampling field points on the photosensitive surface of the camera, the angles theta of the principal rays relative to the optical axis after the beams to be measured of the off-axis field points B1 to B4 are folded 2 The value satisfies the following conditionThe angle theta of the principal ray relative to the optical axis after the light beams to be measured of the off-axis visual field points B5-B6 and C1-C2 are folded 2 The value satisfies the following condition，θ 0 Is the sub-field angle of the beam to be measured.
The same camera is convenient to image the sampling view field point light beams, the light beams to be measured of the off-axis view field points B1 to B6 and the off-axis view field points C1 to C2 are folded and then imaged on the camera photosurface, and the imaging of the light beam to be measured of the central view field point A0 on the camera photosurface is taken as the center.
In order to reasonably distribute the light beams to be measured on the camera photosurface, the diameter D of the sub-image surface area of each light beam to be measured on the camera photosurface is the same, and the light beams to be measured are:f' is the focal length of the imaging receiving lens, θ 0 Is the sub-field angle of the beam to be measured.
Preferably, the angle between the front surface of each prism and the optical axisThe angle between the rear surface of the prism and the optical axis +.>The included angle between the reflecting surface and the front and back surfaces is the same, namely。
Prevent that prism module and glasses leg from interfering, the distance d1 of terminal surface to exit pupil face before the prism module satisfies: 10mm < d1<20mm.
In order to minimize the projection height of the light beam to be detected of each sampling view field point on the imaging receiving lens, the design difficulty of the imaging receiving lens is reduced, and the distance d2 between the rear end surface of the prism module and the imaging receiving lens meets the following conditions: 50mm < d2<100mm.
In order to enable the light beam to be detected passing through the imaging receiving lens to form an image on the camera photosurface, the distance between the imaging receiving lens and the camera photosurface is the back focal length value of the lens.
The chromatic aberration introduced by the prisms is avoided, the design is convenient, and the front surface and the rear surface of each prism are unfolded into flat glass relative to the reflecting surface.
The beneficial effects are that: the invention adopts the prism module to turn the light beam to be detected of the full-view field characteristic sampling point to image on the same camera photosurface through the same imaging receiving lens, avoids the interference between the testing module and the glasses leg, and has simple structure, compact volume and lower cost.
Drawings
FIG. 1 is a schematic diagram of the overall layout of a test AR glasses of the present invention;
FIG. 2 is a schematic layout of the right eye of the test AR glasses;
FIG. 3 is a schematic diagram of a prism turning light path;
FIG. 4 is a schematic perspective view of a prism module;
FIG. 5 is a schematic cross-sectional view of a prism module;
fig. 6 is a schematic diagram of the distribution of feature sampling test points imaged on a camera target surface.
Detailed Description
The invention will be further described with reference to the drawings and the examples of embodiments.
Taking the detection of the whole AR glasses as an example, the specific structural layout is shown in fig. 1-2, and the optical system of the invention is arranged behind the exit pupil of the left eye or the right eye of the AR glasses G01 to be detected. In this example, the distance d1 from the front end surface of the prism module G03 to the exit pupil surface G02 of the glasses to be tested satisfies: the value of d1 is too small, which is easy to cause the cutting of the beam to be measured on the shaft, and the value of d1 is 10mm < d1<20 mm; d1 is too large to cause interference between the prism module and the glasses leg G04. The distance d2 between the prism module G03 and the imaging receiving lens G05 is as follows: 50mm < d2<100mm; the distance d3 between the imaging receiving lens G05 and the camera photosurface G06 is equal to the back focal length value of the lens. In this example, ANSI 9-point sampling test is used, and 9 feature sampling field points are shown in table 1:
in the table, A0 is a central view field point, B1 to B6 and C1 to C2 on an optical axis Z, and an off-axis view field point B1 and an off-axis view field point B4 are located in the same cross section, an off-axis view field point B2 and an off-axis view field point B3 are located in the same cross section, an off-axis view field point B5 and an off-axis view field point B6 are located in the same cross section, and an off-axis view field point C1 and an off-axis view field point C2 are located in the same cross section.
Determining the angle theta of the characteristic sampling view field point relative to the optical axis according to the characteristic sampling view field point coordinates of the table 1 ，Alpha is the component of the angle of view of the feature sampling field point in the Y direction, beta is the component of the angle of view of the feature sampling field point in the X direction, and θ is the obtained angle of view of each feature sampling field point 1 The method comprises the following steps: a0 is 0 DEG; b1 to B4, 20.3 degrees; B4-B5: 15 °; C1-C2: 25 deg..
α、β、θ 1 After the angle value is determined, the position of the beam to be measured with the angle in space can be determined. In order to make each light beam to be tested pass through the same imaging receiving lens and focus on the same camera photosurface for imaging, the arrangement of the prism module in this example is shown in fig. 4-5, the center of the prism module P01 corresponds to the central view field point A0, P01 is not provided with a reflecting prism, and 8 prisms surround the optical axis ZThe central field point A0 of the lens pair is set, the prisms P02, P03 correspond to the field points B5, B6, P04, P05 correspond to the field points C2, C1, P06, P07, P08, P09 correspond to the field points B3, B4, B1, B2.
As shown in FIG. 3, the principal ray of the light beam to be measured is reflected by the prism reflection surface and then has an angle θ relative to the optical axis 2 Angle θ of prism reflecting surface relative to optical axis 3 And the angle theta of each preset characteristic sampling view field point relative to the optical axis 1 The relation of (2) is:。
wherein, in order to avoid overlapping of 9 sampling field points on the camera target surface, the angles theta of the principal rays relative to the optical axis after the beams to be measured of the off-axis field points B1-B4 are folded 2 The value satisfies the following relation:
the angle theta of the principal ray relative to the optical axis after the beams to be measured of off-axis visual field points B5-B6 and C1-C2 are folded 2 The value satisfies the following relation:
in θ 0 For the sub-field angle of the light beam to be measured, θ in this example 0 Preferably + -1.5 deg..
According to the relationThe reflecting surface of the prism corresponding to each beam to be measured can be determined, the front surface S02 of each prism is perpendicular to the corresponding principal ray of the beam to be measured, the rear surface S04 is perpendicular to the principal ray of the beam to be measured after being folded, the included angle between the front surface S02 of the prism and the reflecting surface S05 is the same as the included angle between the rear surface S04 of the prism and the reflecting surface S05, and in this example, the angle value of each prism is determined according to the following relation:
；
；
。
selecting the length of the side AD of the prism, and determining the size of the prism;
the center of the prism module is laterally offset from the optical axis Z by a distance h,。
to avoid chromatic aberration introduced by the prisms, the front and rear surfaces of each prism are unfolded into a sheet of glass against the reflective surface. The reflecting surface of each reflecting prism is used as a total reflecting surface, so that no loss of energy of the test beam is caused.
In the test, as shown in fig. 6, the imaging of 9 feature sampling field points on the camera photosurface is that the beam to be measured at the central field point A0 directly passes through the center of the prism module for imaging, the beam to be measured at the off-axis field points B1 to B6 and the off-axis field points C1 to C2 are folded and then imaged on the camera photosurface, the imaging of the beam to be measured at the central field point A0 on the optical axis Z is centered on the imaging of the camera photosurface, and the calculation formula of the diameter D of the sub-image surface area of the beam to be measured at each field point on the camera photosurface is as follows:
wherein f' is the focal length of the selected imaging receiving lens, θ 0 Is the sub-field angle of the beam to be measured.
When the refraction optical system is designed, the design parameters of each prism of the prism module can be obtained through the known data of the field point to be detected, and the results are shown in the following table:
in order to enable one camera to receive all test points, the invention deflects the light beams to be tested of the test points by means of prisms with different reflection angles, then images the light beams on the photosensitive surface of one camera by means of an imaging receiving lens, and the performance of the glasses to be tested can be judged according to the imaging quality of the target in each subarea.
While the exemplary embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims, and the present invention provides exemplary applications for detecting the performance of an AR eyeglass set, but is not limited to the performance detection of an AR eyeglass set, and can also be applied to the sampling detection of other optical set component modules such as optical waveguide sheets and projection modules.
Claims (8)
1. The prism refraction optical system for full-view field characteristic sampling detection is characterized by comprising a prism module, an imaging receiving lens and a camera photosurface, wherein the prism module, the imaging receiving lens and the camera photosurface are sequentially arranged along an optical path behind an exit pupil, the prism module comprises a plurality of prisms which surround an optical axis and correspond to a preset characteristic sampling view field point, a light beam to be detected of the preset characteristic sampling view field point enters the same imaging receiving lens after being refracted by the corresponding prisms and is focused on the same camera photosurface to form images, and the main light beam to be detected is reflected by the prism reflecting surface to form an angle theta relative to the optical axis 2 Angle θ of prism reflecting surface relative to optical axis 3 And the angle theta of each preset characteristic sampling view field point relative to the optical axis 1 The relation of (2) is: θ 1 ＝θ 2 +2θ 3 ；
The preset feature sampling view field point comprises a central view field point A0, off-axis view field points B1-B6 and off-axis view field points C1-C2 which are positioned on the optical axis Z, wherein the off-axis view field point B1 and the off-axis view field point B4 are positioned in the same section, and the off-axis view field point B2 and the off-axis view field point C1-C2 are positioned in the same sectionThe field point B3 is located in the same cross section, the off-axis field point B5 and the off-axis field point B6 are located in the same cross section, and the off-axis field point C1 and the off-axis field point C2 are located in the same cross section, whereinAlpha is a component of the view angle of the feature sampling view point in the Y direction, and beta is a component of the view angle of the feature sampling view point in the X direction;
angle θ of principal ray relative to optical axis after beam to be measured at off-axis field points B1 to B4 is folded 2 The value satisfies tan (theta) 2 )×sin(arctan(tanα/tanβ))>2tan(θ 0 ) The angle theta of the principal ray relative to the optical axis after the beams to be measured of the off-axis visual field points B5 to B6 and C1 to C2 are folded 2 The value satisfies tan (theta) 2 )-2tan(θ 0 )>0，θ 0 Is the sub-field angle of the beam to be measured.
2. The prism refraction optical system for full-field feature sampling detection according to claim 1, wherein the imaging of the light beams to be detected at the camera photosurface after the off-axis field points B1 to B6 and the off-axis field points C1 to C2 are refracted is centered on the imaging of the light beam to be detected at the central field point A0 at the camera photosurface.
3. The prism refraction optical system for full-field feature sampling detection according to claim 2, wherein the sub-image surface area diameter D of each light beam to be detected on the photosensitive surface of the camera is the same, and is: d=2f' tan (θ 0 ) F' is the focal length of the imaging receiving lens, θ 0 Is the sub-field angle of the beam to be measured.
4. The prism refraction optical system for full-field feature sampling detection of claim 1, wherein an angle between a front surface of each prism and an optical axis is +.bad=90++θ 1 Angle cda=90° +θ between the rear surface of the prism and the optical axis 2 The included angle between the reflecting surface and the front surface and the rear surface is the same, namely: the angle abc= the angle bcd= (360 ° -the angle BAD- < CDA)/2.
5. The prism refraction optical system for full-field feature sampling detection according to claim 1, wherein a distance d1 from a front end surface of the prism module to an exit pupil surface satisfies: 10mm < d1<20mm.
6. The prism refraction optical system for full-field feature sampling detection according to claim 1, wherein a distance d2 between a rear end face of the prism module and the imaging receiving lens is as follows: 50mm < d2<100mm.
7. The prism refraction optical system for full-field feature sampling detection according to claim 1, wherein a distance between the imaging receiving lens and the photosensitive surface of the camera is a back focal length value of the lens.
8. The prism refraction optical system for full field feature sampling detection of claim 1 wherein each prism front and rear surface is unfolded as a sheet glass against the reflective surface.
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