CN114705396A - Prism turning optical system for full-field feature sampling detection - Google Patents
Prism turning optical system for full-field feature sampling detection Download PDFInfo
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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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Abstract
The invention discloses a prism turning 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 a back light path of 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 turned by the corresponding prisms and is focused on the same camera photosurface for imaging, and a chief ray of the light beam to be detected is reflected by a prism reflecting surface and then has an angle theta relative to the optical axis2Angle theta of prism reflecting surface relative to optical axis3And the angle theta of each preset characteristic sampling view field point relative to the optical axis1The relationship of (1) is:
. The invention adopts the prism module to treat the full-view characteristic sampling pointThe light beam is refracted and imaged on the same camera photosurface through the same imaging receiving lens, so that the interference between the test module and the glasses legs is avoided, and the device is simple in structure, compact in size and low in cost.
Description
Technical Field
The invention relates to optical path sampling detection, in particular to a prism turning optical system for full-field feature sampling detection.
Background
Along with the light weight and the miniaturization of the volume of the system module, the interval between an exit pupil area and an entrance pupil enveloped by an eye box within an eye movement range is smaller and smaller, the entrance pupil is generally positioned at the front end of the projection module arranged in the AR glasses legs, and the nearest distance between the glasses legs and the eye movement range is even shortened to 15-18 mm, so that certain difficulty is brought to the detection of the performance of the AR glasses complete machine.
The performance of the complete machine of the AR glasses can be detected by covering the full view field or taking 9 characteristic test points in the full view field space according to an ANSI 9 point test method; the former can cover the whole field angle by means of a cone lens, but the outer diameter of the front end of the lens is larger, and the front end of the lens interferes with AR glasses legs; the latter gets 9 feature test points in full field of view space according to ANSI test method, generally needs 9 receiving lens camera modules, and whole check out test set volume is great, and the cost is higher.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a prism turning optical system for full-field feature sampling detection, which solves the problems of complex structure, larger volume, difficult assembly and adjustment and higher cost caused by a plurality of receiving lenses and camera modules required by full-field feature testing by using a prism module, an imaging receiving lens and a camera photosurface.
The technical scheme is as follows: the prism turning optical system for full-field characteristic sampling detection comprises a prism module, an imaging receiving lens and a camera photosurface which are sequentially arranged along a light path behind an exit pupil, wherein the prism module comprises a plurality of prisms which surround an optical axis and correspond to a preset characteristic sampling field point, and a light beam to be detected of the preset characteristic sampling field point enters the same imaging receiving lens after being turned by the corresponding prisms and is focused on the same imaging receiving lensImaging the photosensitive surface of the camera, wherein the chief ray of the light beam to be measured is reflected by the prism reflecting surface and then has an angle theta relative to the optical axis2Angle theta of prism reflecting surface relative to optical axis3And the angle theta of each preset characteristic sampling view field point relative to the optical axis1The relationship of (1) is:
。
preferably, the predetermined characteristic sampling field of view points include a central field of view point A0, off-axis field of view points B1-B6, and off-axis field of view points C1-C2 located on the optical axis Z, wherein the off-axis field of view point B1 and the off-axis field of view point B4 are located in the same section, the off-axis field of view point B2 and the off-axis field of view point B3 are located in the same section, the off-axis field of view point B5 and the off-axis field of view point B6 are located in the same section, and the off-axis field of view point C1 and the off-axis field of view point C2 are located in the same section, wherein
α is a component of the characteristic sampling field point angle in the Y direction, and β is a component of the characteristic sampling field point angle in the X direction.
In order to avoid the overlapping of the sampling view field points on the photosensitive surface of the camera, the angles theta of the chief rays of the off-axis view field points B1-B4 to be measured after the beams are folded relative to the optical axis2Value satisfies
The main light beam to be measured of the off-axis field-of-view points B5-B6 and C1-C2 is subjected to angle theta relative to the optical axis after being bent2Value satisfies
，θ0Is the sub-field angle of the light beam to be measured.
The imaging of the light beams to be measured of the off-axis field-of-view points B1-B6 and the off-axis field-of-view points C1-C2 on the photosensitive surface of the camera after being converted is centered on the imaging of the light beams to be measured of the central field-of-view point A0 on the photosensitive surface of the camera.
To make the light beam to be measured in phaseThe machine photosurfaces are reasonably distributed, and the diameter D of the sub image surface area of each light beam to be detected on the camera photosurface is the same as that of the sub image surface area of each light beam to be detected:
f' is the focal length of the imaging receiving lens, theta0Is the sub-field angle of the light beam to be measured.
Preferably, each prism front surface includes an angle with the optical axis
Angle between prism rear surface and optical axis
The included angle between the reflecting surface and the front and rear surfaces is the same, that is
。
Prevent that prism module and glasses leg from interfering, the distance d1 of terminal surface to exit pupil face satisfies before the prism module: 10mm < d1<20 mm.
In order to minimize the projection height of the light beam to be detected of each sampling field point on the imaging receiving lens and reduce the design difficulty of the imaging receiving lens, the distance d2 between the rear end surface of the prism module and the imaging receiving lens meets the following requirements: 50mm < d2<100 mm.
In order to enable the light beam to be measured passing through the imaging receiving lens to be imaged on the photosensitive surface of the camera, the distance between the imaging receiving lens and the photosensitive surface of the camera 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 plate glass relative to the reflecting surface.
Has the advantages that: the invention adopts the prism module to convert the light beam to be tested of the full-view characteristic sampling point to image on the same camera photosurface through the same imaging receiving lens, avoids the interference of the testing module and the glasses legs, and has simple structure, compact volume and lower cost.
Drawings
FIG. 1 is a schematic diagram of the overall layout of the 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 view of a prism turning light path;
FIG. 4 is a 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 is further explained below with reference to the drawings and the accompanying drawings of embodiments.
Taking the complete detection of the AR glasses as an example, the specific structural layout is as shown in fig. 1-2, and the optical system of the invention is placed 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 measured satisfies: d1 is more than 10mm and less than 20mm, and the cutting of the light beam to be measured on the shaft is easily caused by too small value of d 1; too large a value of d1 is likely to cause the prism module to interfere with the glasses leg G04. The distance d2 between the prism module G03 and the imaging receiving lens G05 takes the following values: 50mm < d2<100 mm; the distance d3 between the image-receiving lens G05 and the camera light-sensing surface G06 is equal to the back focal length value of the lens. In this example, using the ANSI 9 point sampling test, 9 characteristic sampling field-of-view points are shown in Table 1:
in the above table, a0 is a central field point located on the optical axis Z, B1 to B6 and C1 to C2 are off-axis field points, wherein the off-axis field point B1 and the off-axis field point B4 are located in the same section, the off-axis field point B2 and the off-axis field point B3 are located in the same section, the off-axis field point B5 and the off-axis field point B6 are located in the same section, and the off-axis field point C1 and the off-axis field point C2 are located in the same section.
Determining the angle theta of the characteristic sampling view field point relative to the optical axis according to the coordinates of the characteristic sampling view field point on the upper table1，
Alpha is the component of the characteristic sampling view field point in the Y direction, beta is the component of the characteristic sampling view field point in the X direction, and theta of each characteristic sampling view field point is obtained1Comprises the following steps: a0 is 0 degree; 20.3 degrees of B1-B4; B4-B5: 15 degrees; C1-C2: 25 deg.
α、β、θ1After the angle value is determined, the position of the light beam to be measured with the angle in the space can be determined. In order to focus each light beam to be measured on the same camera photosurface for imaging through the same imaging receiving lens, the arrangement of the prism modules in the example is shown in fig. 4-5, the center P01 of the prism module corresponds to a center field point a0, no reflecting prism is arranged on P01, 8 prisms are arranged around the center field point a0 on the optical axis Z, prisms P02 and P03 correspond to field points B5 and B6, and prisms P04 and P05 correspond to field points C2 and C1, and prisms P06, P07, P08 and P09 correspond to field points B3, B4, B1 and B2.
As shown in fig. 3, the primary light of the light beam to be measured is reflected by the prism reflection surface and has an angle θ relative to the optical axis2Angle theta of prism reflecting surface relative to optical axis3And the angle theta of each preset characteristic sampling view field point relative to the optical axis1The relationship of (1) is:
。
wherein, in order to avoid the overlapping of 9 sampling view field points on the camera target surface, the angles theta of the chief rays of the off-axis view field points B1-B4 to be measured after the beams are folded relative to the optical axis2The values satisfy the following relational expression:
the angle theta of the chief ray of the off-axis field-of-view points B5-B6 and C1-C2 to be measured relative to the optical axis after the chief ray is turned2The values satisfy the following relational expression:
in the formula, theta0The sub-field angle of the beam to be measured, in this case θ0Preferably. + -. 1.5 ℃.
According to the relational expression
The reflecting surface of the prism corresponding to each light beam to be measured can be determined, the front surface S02 of each prism is perpendicular to the principal ray of the corresponding light beam to be measured, the rear surface S04 is perpendicular to the principal ray of the converted light beam to be measured, the included angle between the front surface S02 of the prism and the reflecting surface S05 of the prism is the same as the included angle between the rear surface S04 of the prism and the reflecting surface S05 of the prism, and the angle value of each prism in the embodiment 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 transversely deviated from the optical axis Z by a distance h,
。
in order to avoid chromatic aberration introduced by the prisms, the front surface and the rear surface of each prism are unfolded into plate glass relative to the reflecting surface. The reflecting surface of each reflecting prism is used as a total reflecting surface, and the energy of the test beam is not lost.
During testing, the imaging of the 9 characteristic sampling view field points on the camera photosurface is as shown in fig. 6, the light beam to be tested of the central view field point a0 directly passes through the center of the prism module to be imaged, the imaging of the light beam to be tested of the off-axis view field points B1-B6 and the off-axis view field points C1-C2 on the camera photosurface after being folded is centered on the imaging of the light beam to be tested of the central view field point a0 on the optical axis Z on the camera photosurface, and the diameter D of the sub-image surface area of the light beam to be tested of each view field point on the camera photosurface is calculated by the following formula:
where f' is the focal length of the selected image-receiving lens, θ0Is the sub-field angle of the light beam to be measured.
When designing the folding optical system of the present invention, the design parameters of each prism of the prism module can be obtained through the known data of the field of view point to be measured, and the results are shown in the following table:
in order to receive all the test points by one camera, the invention deflects the light beams to be tested of the test points by prisms with different reflection angles and then images the light beams to be tested on the phase surface of the photosurface of the camera by 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 sub-area.
The exemplary embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims thereof, and the present invention is given an exemplary application of detecting the performance of an AR eyeglass complete machine, but is not limited to only the performance detection of an AR eyeglass complete machine, but also can be applied to sampling detection of other optical complete machine component modules such as an optical waveguide sheet, a projection module.
Claims (10)
1. The utility model provides a prism conversion optical system for full field of vision characteristic sampling detects, its characterized in that includes the prism module, formation of image receiving lens and the camera photosurface that set gradually along light path behind the exit pupil, the prism module is including around the optical axis and with predetermine a plurality of prisms that characteristic sampling field of view point corresponds, predetermine the waiting for measuring light beam of characteristic sampling field of view point and roll over through the prism that correspondsThe primary light beam enters the same imaging receiving lens after being rotated and is focused on the same camera photosensitive surface for imaging, wherein the angle theta of the primary light beam of the light beam to be measured relative to the optical axis after being reflected by the prism reflecting surface2Angle theta of prism reflecting surface relative to optical axis3And the angle theta of each preset characteristic sampling view field point relative to the optical axis1The relationship of (1) is:
。
2. the prism folding optical system for full field-of-view feature sampling inspection according to claim 1, wherein the preset feature sampling field-of-view points include central field-of-view point a0, off-axis field-of-view points B1-B6, and off-axis field-of-view points C1-C2 located on optical axis Z, wherein off-axis field-of-view point B1 and off-axis field-of-view point B4 are located in a same cross-section, off-axis field-of-view point B2 and off-axis field-of-view point B3 are located in a same cross-section, off-axis field-of-view point B5 and off-axis field-of-view point B6 are located in a same cross-section, and wherein off-axis field-of-view point C1 and off-axis field-of-view point C2 are located in a same cross-section, and wherein
α is a component of the characteristic sampling field point angle in the Y direction, and β is a component of the characteristic sampling field point angle in the X direction.
3. The prism folding optical system for sampling and detecting full-field of view of claim 2, wherein the off-axis field-of-view points B1-B4 are arranged such that the main beam of the beam to be measured has an angle θ with respect to the optical axis after being folded2Value satisfies
The main light beam to be measured of the off-axis field-of-view points B5-B6 and C1-C2 is subjected to angle theta relative to the optical axis after being bent2Value satisfies
，θ0Is to be treatedAnd measuring the sub-field angle of the light beam.
4. The prism folding optical system for full-field feature sampling detection according to claim 2, wherein the imaging of the off-axis field-of-view points B1-B6 and the off-axis field-of-view points C1-C2 on the camera photosurface after folding is centered on the imaging of the central field-of-view point a0 on the camera photosurface.
5. The prism turning optical system for full-field feature sampling detection according to claim 4, wherein the diameter D of the sub-image surface area of each light beam to be detected on the light-sensitive surface of the camera is the same as:
f' is the focal length of the image receiving lens, theta0Is the sub-field angle of the light beam to be measured.
6. The prism turning optical system for full field of view feature sampling inspection of claim 1, wherein each prism front surface is at an angle to the optical axis
Angle between prism rear surface and optical axis
The included angle between the prism reflecting surface and the front and rear surfaces is the same, namely:
。
7. the prism turning optical system for full-field feature sampling detection according to claim 1, wherein the distance d1 from the front end face to the exit pupil face of the prism module satisfies: 10mm < d1<20 mm.
8. The prism turning optical system for full-field feature sampling detection according to claim 1, wherein the distance d2 between the rear end face of the prism module and the imaging receiving lens satisfies the following condition: 50mm < d2<100 mm.
9. The prism turning optical system for full-field feature sampling detection according to claim 1, wherein the distance between the image receiving lens and the light sensing surface of the camera is a back focal length value of the lens.
10. The prism folding optical system for full field of view feature sampling inspection of claim 1, wherein each prism front and back surface is unfolded as a flat glass against the prism reflective surface.
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