CN114089508B - Wide-angle projection lens for detecting optical waveguide AR lens - Google Patents
Wide-angle projection lens for detecting optical waveguide AR lens Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 230000014509 gene expression Effects 0.000 claims description 19
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- 238000007689 inspection Methods 0.000 claims 7
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- 239000011521 glass Substances 0.000 abstract description 15
- 210000001747 pupil Anatomy 0.000 abstract description 14
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- 230000008878 coupling Effects 0.000 abstract 1
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- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000012546 transfer Methods 0.000 description 7
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- 230000004424 eye movement Effects 0.000 description 2
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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- G—PHYSICS
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- 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
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- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
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Abstract
The invention discloses a wide-angle projection lens for detecting an optical waveguide AR lens, which sequentially comprises the following components from top to bottom: preceding lens group, diaphragm trompil and back lens group, preceding lens group become virtual diaphragm with the projection of diaphragm trompil to the camera lens foremost, and preceding lens group includes from last to down in proper order: a turning prism, a fourth lens, a fifth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the multiplying power beta of the front lens group satisfies: 1.8< β < 3.0. According to the wide-angle projection lens, the entity diaphragm in the lens is led out of the lens to form the virtual diaphragm, the coincidence degree of the exit pupil is smaller than 0.1mm through the correction of the diaphragm aberration, and the exit pupil is coincided with the diaphragm of the AR glasses to be measured, so that targets with the same size can be provided for different fields of view, and the coupling energy utilization rate is improved; meanwhile, the problem of physical interference of the projection lens and the receiving lens in the transverse dimension when the large-angle object to be detected is detected on the same side is solved.
Description
Technical Field
The invention relates to a lens technology, in particular to a wide-angle projection lens for detecting an optical waveguide AR lens.
Background
The optical waveguide can realize that a smaller volume is favored by mainstream AR optical display equipment manufacturers, the view field angle of the optical waveguide is pushed to 90 degrees, 120 degrees or even 150 degrees, and meanwhile, along with the light weight and miniaturization of the module volume, the distance between the entrance pupil of the optical waveguide sheet and the near-point exit pupil of the eye movement range eye box can be shortened to 15-18 mm, which brings great challenges to the performance detection in the production and manufacturing processes of the large-angle optical waveguide sheet. The detection is carried out by introducing a test pattern from an entrance pupil, receiving the test pattern at an exit pupil within an eye movement range and respectively completing the detection by virtue of a projection lens and a receiving lens, and the wide-angle projection lens is different from a conventional projection lens and is used for detecting an optical waveguide AR lens.
The wide-angle lens is affected by the diaphragm aberration and is not easy to correct, certain technical points are sacrificed when the cost conflicts with the function according to different application scenes, compromise is accepted, and the common wide-angle or fisheye lens as shown in patent CN104793316A \ CN105204141A abandons the correction of the diaphragm aberration; if the aperture of patent CN108254882A is located on the surface 3, the aberration of the aperture is under-corrected by the significant misalignment of the back exit pupil positions of the front groups 1 and 2.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a wide-angle projection lens for detecting an optical waveguide AR lens, aiming at the problem that the aberration of a diaphragm of a wide-angle lens is not easy to correct.
The technical scheme is as follows: the invention discloses a wide-angle projection lens for detecting an optical waveguide AR lens, which sequentially comprises the following components from top to bottom: preceding lens group, diaphragm trompil and back lens group, preceding lens group become virtual diaphragm with the projection of diaphragm trompil to the camera lens foremost, and preceding lens group includes from last to down in proper order: a turning prism, a fourth lens, a fifth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the multiplying power beta of the front lens group satisfies: 1.8< β < 3.0.
Preferably, the front lens group further comprises a first cemented lens arranged at the front end of the turning prism, a third lens arranged between the turning prism and the fourth lens, and a sixth lens arranged between the fifth lens and the seventh lens;
the first cemented lens is composed of a first cemented lens and a second cemented lens, the first lens is a plano-concave lens, the second lens is a biconvex lens, the third lens is a plano-convex lens, the third lens and the turning prism are cemented into the second cemented lens, the sixth lens is a concave-convex lens, and the sixth lens and the fifth lens are cemented into the third cemented lens.
Preferably, the combined focal length f12 of the first cemented lens satisfies the following relationship with respect to the focal length f of the wide-angle projection lens:
-2<f12/f<-1；
the third lens satisfies the following conditional expression:
1＜|f4/r7|＜3；
where f4 denotes a focal length of the third lens, and r7 denotes a radius of curvature of a lower surface of the third lens.
Preferably, the fourth lens is a meniscus lens, and the following conditional expression is satisfied:
1＜|f5/r9|＜3；
where f5 denotes a focal length of the fourth lens, and r9 denotes a radius of curvature of a lower surface of the fourth lens.
Preferably, the eighth lens is a convex-concave lens, and the thickness d9 satisfies the following conditional expression:
0.1＜|d9/f9|＜0.25；
where f9 denotes a focal length of the eighth lens, and d9 denotes a thickness of the eighth lens.
Preferably, the tenth lens is a meniscus lens, and the thickness d11 satisfies the following conditional expression:
0.15＜|d11/f11|＜0.2；
where f11 denotes a focal length of the tenth lens, and d11 denotes a thickness of the tenth lens.
Preferably, the rear lens group comprises from top to bottom: an eleventh lens, a fourth cemented lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens; the eleventh lens and the fourteenth lens are both double-convex lenses, the fifteenth lens is a meniscus lens, the sixteenth lens is a double-concave lens, and the sixteenth lens satisfies the following conditional expression:
-0.8＜f17/r31＜-0.5；
0.5＜f17/r32＜0.8；
where f17 denotes a focal length of the sixteenth lens, and r31 and r32 denote radii of curvature of the upper and lower surfaces of the sixteenth lens, respectively.
Preferably, the fourth cemented lens is composed of a cemented twelfth lens and a cemented seventeenth lens, or is composed of a cemented twelfth lens and a cemented thirteenth lens, wherein the twelfth lens is a biconvex lens, the thirteenth lens is a meniscus lens, and the seventeenth lens is a biconcave lens.
Preferably, the combined focal length f13 of the front lens set satisfies the following relationship:
-3<f13/f<-2；
the combined focal length f14 of the back lens group satisfies the following relationship:
3<f/f14<5；
wherein f is the focal length of the wide-angle projection lens;
the refractive index of the folding prism is n = 1.85.
The detection device for detecting the optical waveguide AR lens comprises the wide-angle projection lens.
Has the advantages that: compared with the prior art, the invention has the beneficial effects that:
(1) the invention leads the entity diaphragm in the lens out of the lens to be the virtual diaphragm, reduces the deviation degree of the exit pupil through the diaphragm aberration correction, improves the contact ratio of the emergent light spot, improves the energy utilization ratio of the coupled AR glasses to be measured, and can provide the same size of object for different fields of view;
(2) when the large-angle object to be detected is detected on the same side, the projection lens and the receiving lens are transversely separated through the turning prism, so that lens interference is avoided.
Drawings
FIG. 1 is a projection optical path layout according to a first embodiment;
FIG. 2 is a graph of an optical transfer function according to a first embodiment;
FIG. 3 is a graph of field curvature and distortion according to a first embodiment;
FIG. 4 is a vertical axis color difference chart of the first embodiment;
FIG. 5 is a virtual pupil overlap ratio of embodiment one;
FIG. 6 is a projection optical path layout of the second embodiment;
FIG. 7 is a graph of the optical transfer function of the second embodiment;
FIG. 8 is a graph of field curvature and distortion for the second embodiment;
FIG. 9 is a vertical axis color difference chart of the second embodiment;
FIG. 10 shows the virtual pupil overlap ratio of the second embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The first embodiment is as follows:
TABLE 1 technical index of the example
As shown in fig. 1, a wide-angle projection lens for optical waveguide AR lens detection includes 16 lenses and 1 prism, and includes, from top to bottom (i.e. from the virtual diaphragm S01 to the direction of the partition surface S03 shown in fig. 1): first lens L01, second lens L02, folding prism L03, third lens L04, fourth lens L05, fifth lens L06, sixth lens L07, seventh lens L08, eighth lens L09, ninth lens L10, tenth lens L11, eleventh lens L12, twelfth lens L13, thirteenth lens L14, fourteenth lens L15, fifteenth lens L16 and sixteenth lens L17, parameters of 16 lenses and one prism are shown in table 2, the first column in table 2 gives the number of lenses (i.e., the number of 16 lenses and 1 prism), the second column gives the number of upper and lower surfaces of lenses (i.e., the number of upper and lower surfaces of 16 lenses and 1 prism), wherein S01 denotes a virtual stop of a projection lens, S03 denotes a surface plate, the third column denotes a spherical surface or a flat surface, the fourth column denotes a radius of a curved surface of a lens, and the thickness of a curved surface of a fifth column denotes a curved surface or a curved thickness of a curved surface of a lens, the sixth column gives the index of refraction of the lens glass and the seventh column the Abbe number of the glass.
Table 2 example parameters
Specifically, the method comprises the following steps: the first lens L01 is a negative focal length plano-concave lens, the upper surface of which is a plane and the lower surface of which is a concave surface; the second lens L02 is a biconvex lens with positive focal length, the first lens L01 and the second lens L02 are cemented into a first cemented lens, which performs the first-stage angle compression on incident light, effectively reduces the size of the turning prism, and the combined focal length f12 of the first cemented lens satisfies the following relationship relative to the focal length f of the whole wide-angle projection lens: -2< f12/f < -1; the folding prism L03 is a flat glass plate spread by a high-refractive index folding prism, and the refractive index n = 1.85; the third lens L04 is a plano-convex lens with positive focal length, the upper surface is a plane, the lower surface is a convex surface, and the glass flat plate L03 and the third lens L04 are cemented into a second cemented lens; the fourth lens L05 is a meniscus lens with positive focal length and curves to the virtual diaphragm, i.e. the upper surface is concave and the lower surface is convex; the fifth lens L06 is a biconvex lens with positive focal length, the sixth lens L07 is a concave-convex lens with negative focal length, the upper surface is a concave surface, the lower surface is a convex surface, and the fifth lens L06 and the sixth lens L07 are cemented into a third cemented lens; the seventh lens element L08 is a positive lens element with a convex surface facing the image side, and has a convex upper surface and a concave lower surface, and the seventh lens element L08 may be a biconvex lens element; the eighth lens element L09 is a positive lens element having a convex surface facing the image side, and has a larger thickness to correct curvature of field; the ninth lens L10 is a convex-concave lens with negative focal length, the upper surface is a convex surface, and the lower surface is a concave surface; the tenth lens L11 is a positive lens with a concave surface facing the virtual diaphragm, i.e., the upper surface is a concave surface and the lower surface is a convex surface; the eleventh lens L12 is a biconvex lens of positive focal length; the twelfth lens L13 is a biconvex lens with positive focal length, the thirteenth lens L14 is a concave-convex lens with negative focal length, the upper surface is a concave surface, and the lower surface is a convex surface; the twelfth lens L13 and the thirteenth lens L14 are cemented into a fourth cemented lens; the fourteenth lens L15 is a biconvex lens of positive focal length; the fifteenth lens element L16 is a positive meniscus lens element with the convex surface facing the image side, i.e., the upper surface is convex and the lower surface is concave; the sixteenth lens L17 is a biconcave lens with a negative focal length and functions to correct curvature of field.
The whole projection lens is composed of single lenses and cemented lenses with different optical characteristics (refractive index and dispersion coefficient), and the imaging quality (optical transfer function) of the lens reaches a better level through the optimal collocation of glass materials.
The further projection lens is an image space telecentric light path, and the telecentricity on the lower reticle plane side is less than 2 degrees.
A lens group consisting of a first lens L01, a second lens L02, a folding prism L03, a third lens L04, a fourth lens L05, a fifth lens L06, a sixth lens L07, a seventh lens L08, an eighth lens L09, a ninth lens L10 and a tenth lens L11 is used as a front lens group, and is used for partially correcting the aberration of the whole projection lens, and is also responsible for projecting the diaphragm opening S02 to the foremost end of the lens to form a virtual diaphragm S01, and the combined focal length f13 of the lens group satisfies the following relationship:
-3<f13/f<-2；
the combination multiplying power beta satisfies the following conditions:
1.8<β<3.0。
the eleventh lens element L12 through the sixteenth lens element L17 are lens rear groups, i.e., rear lens groups, and the combined focal length f14 satisfies the following relationship:
3<f/f14<5。
preferably, when the third lens L04 satisfies the following conditional expressions, the light that converges that the fourth lens L05 can be fine can be guaranteed, and the reduction of the rear end aperture of the lens is facilitated, so that the volume of the lens is reduced:
1＜|f4/r7|＜3；
where f4 denotes a focal length of the third lens L04, and r7 denotes a radius of curvature of a lower surface (i.e., a mirror surface of the far virtual stop) of the third lens L04.
When the fourth lens L05 satisfies the following conditional expressions, can guarantee that the fifth lens L06 can be fine assembles light, be favorable to reducing camera lens rear end bore to reduce the camera lens volume:
1＜|f5/r9|＜3；
where f5 denotes a focal length of the fourth lens L05, and r9 denotes a radius of curvature of a lower surface (i.e., a mirror surface of the far virtual stop) of the fourth lens L05.
Preferably, when the thickness d9 of the eighth lens L09 satisfies the following conditional expression, the curvature of field of the front group can be corrected well:
0.1＜|d9/f9|＜0.25；
where f9 denotes a focal length of the eighth lens L09, and d9 denotes a thickness of the eighth lens L09.
Preferably, when the thickness d11 of the tenth lens L11 satisfies the following conditional expression, the curvature of field of the front group can be corrected well:
0.15＜|d11/f11|＜0.2；
where f11 denotes a focal length of the tenth lens L11, and d11 denotes a thickness of the tenth lens L11.
Preferably, the sixteenth lens L17 can correct the curvature of field of the system well and has no tolerance sensitivity when it satisfies the following conditional expression:
-0.8＜f17/r31＜-0.5；
0.5＜f17/r32＜0.8；
where f17 denotes a focal length of the sixteenth lens L17, and r31 and r32 denote radii of curvature of upper and lower surfaces (i.e., a surface close to the virtual stop and a surface far from the virtual stop) of the sixteenth lens L17, respectively.
Fig. 2 shows the image quality, i.e. the optical transfer function graph, of the first embodiment, and it can be seen that the optical transfer function value is greater than 0.55 at 70 line pairs/mm, and the image quality is better.
FIG. 3 shows the curvature of field and distortion curve of the first embodiment, as can be seen from (a) in FIG. 3, the curvature of field is less than 0.15mm, and as can be seen from (b) in FIG. 3, the distortion value is-46%; this distortion value is acceptable for a 120 degree field of view.
FIG. 4 shows the vertical axis chromatic aberration curve of the first embodiment, and it can be seen that the vertical axis chromatic aberration is controlled within the Airy spot range, and the chromatic aberration is corrected well.
Fig. 5 shows the overlapping degree of the virtual exit pupil, and it can be seen from the figure that the overlapping degree of the virtual exit pupil is less than 0.1mm, so that the energy utilization rate of the AR glasses to be coupled into the glasses to be measured is improved, and simultaneously, objects with the same size can be provided for different fields of view.
Example two:
TABLE 3 technical indices of example two
As shown in fig. 6, the projection lens includes 12 lenses and 1 folding prism, and includes, from top to bottom (i.e., from the virtual stop S01 to the direction of the partition surface S03 as shown in fig. 6): the parameter tables of the turning prism L03, the fourth lens L05, the fifth lens L06, the seventh lens L08, the eighth lens L09, the ninth lens L10, the tenth lens L11, the eleventh lens L12, the twelfth lens L13, the seventeenth lens L18, the fourteenth lens L15, the fifteenth lens L16 and the sixteenth lens L17, 12 lenses and 1 turning prism are shown in table 4, the first column in table 4 gives the lens numbers, the second column gives the numbers of the upper and lower surfaces of the lenses, wherein S01 denotes a virtual stop of the projection lens, S03 denotes a reticle plane, the third column denotes a spherical or planar surface, the fourth column denotes a curvature radius of the lens surface, the fifth column gives the thickness of the lenses or an air space between the lenses, the sixth column gives the refractive index of the lens glass, and the seventh column gives the dispersion coefficient of the glass.
Table 4 example two parameters
Compared with the first embodiment, the second embodiment has the field angle of 100 degrees, the turning prism is made of glass with higher refractive index, the lens group in front of the prism is eliminated, and the assembly and adjustment difficulty is reduced.
Specifically, the method comprises the following steps: in practical design, L03 is a flat sheet of high-index folded prism spread glass with index n = 2.0; the fourth lens L05 is a meniscus convex lens with positive focal length, and its upper surface is a concave surface and its lower surface is a convex surface; the fifth lens L06 is a biconvex lens with positive focal length, the seventh lens L08 is a biconvex lens with positive focal length, or a convex-concave lens, the upper surface is a convex surface, and the lower surface is a concave surface; the eighth lens L09 is a positive lens with a forward convex surface, and has a convex upper surface and a concave lower surface, and has a thicker thickness to correct curvature of field; the ninth lens L10 is a convex-concave lens with negative focal length, the upper surface is convex, and the lower surface is concave; the tenth lens L11 is a positive lens with a concave surface facing the virtual diaphragm, and has a concave upper surface and a convex lower surface; the eleventh lens L12 is a positive focal length biconvex lens; the twelfth lens L13 is a biconvex lens with a positive focal length, the seventeenth lens L18 is a biconcave lens with a negative focal length, the twelfth lens L13 and the seventeenth lens L18 form a fourth cemented lens, and the fourteenth lens L15 is a biconvex lens with a positive focal length; the fifteenth lens L16 is a positive meniscus lens with a convex surface facing forward, and has a convex upper surface and a concave lower surface; the sixteenth lens L17 is a biconcave lens with a negative focal length and functions to correct curvature of field.
The folding prism L03, the fourth lens L05, the fifth lens L06, the seventh lens L08, the eighth lens L09, the ninth lens L10, and the tenth lens L11 are used as a front lens group, and are used for correcting the aberration of the whole projection lens, and are also responsible for projecting the diaphragm aperture S02 to the foremost end of the lens to form a virtual diaphragm S01, and the combined focal length f13 of the virtual diaphragm S01 satisfies the following relations:
-3<f13/f<-2；
the combination multiplying power beta satisfies the following conditions:
1.8<β<3.0。
the eleventh lens L12, the twelfth lens L13, the seventeenth lens L18, the fourteenth lens L15, the fifteenth lens L16 and the sixteenth lens L17 are a rear lens group, and the combined focal length f14 satisfies the following relationship:
3<f/f14<5。
preferably, when the fourth lens L05 satisfies the following conditional expressions, the light that converges that fifth lens L06 can be fine can be guaranteed, and the reduction of the bore of the rear end of the lens is facilitated, so that the volume of the lens is reduced:
1＜|f5/r9|＜3；
where f5 denotes a focal length of the fourth lens L05, and r9 denotes a radius of curvature of a lower surface (i.e., a surface far from the virtual stop) of the fourth lens L05.
Preferably, when the thickness d9 of the eighth lens L09 satisfies the following conditional expression, the curvature of field of the front group can be corrected well:
0.1＜|d9/f9|＜0.25；
where f9 denotes a focal length of the eighth lens L09, and d9 denotes a thickness of the eighth lens L09.
Preferably, when the thickness d11 of the tenth lens L11 satisfies the following conditional expression, the curvature of field of the front group can be corrected well:
0.15＜|d11/f11|＜0.2；
where f11 denotes a focal length of the tenth lens L11, and d11 denotes a thickness of the tenth lens L11.
Preferably, the sixteenth lens L17 can correct the curvature of field of the system well and has no tolerance sensitivity when it satisfies the following conditional expression:
-0.8＜f17/r31＜-0.5；
0.5＜f17/r32＜0.8；
where f17 denotes a focal length of the sixteenth lens L17, and r31 and r32 denote radii of curvature of upper and lower surfaces (i.e., a surface close to the virtual stop and a surface far from the virtual stop) of the sixteenth lens L17, respectively.
Fig. 7 shows the image quality, i.e. the optical transfer function graph, of the second embodiment, and it can be seen from the graph that the optical transfer function value is greater than 0.62 at 50 line pairs/mm, and the image quality is better.
FIG. 8 shows the curvature of field and distortion curve of the second embodiment, where the curvature of field is less than 0.2mm as shown in FIG. 8 (a), and the distortion is-35% as shown in FIG. 8 (b).
FIG. 9 shows the vertical axis chromatic aberration curve of the second embodiment, and it can be seen that the vertical axis chromatic aberration is controlled within the Airy spot range, and the chromatic aberration is corrected well.
Fig. 10 shows the overlapping degree of the virtual exit pupil, and it can be seen from the figure that the overlapping degree of the virtual exit pupil is less than 0.1mm, so that the energy utilization rate of the AR glasses to be coupled into the glasses to be measured is improved, and simultaneously, objects with the same size can be provided for different fields of view.
Through further elaboration of the two embodiments, the optical design software is used for correcting the diaphragm aberration to a smaller range, the entity diaphragm inside the lens is imaged and extended to the outside of the lens to form a virtual diaphragm (exit pupil), the contact ratio of the virtual diaphragm (the offset is less than 0.1mm) is improved, the energy utilization rate of the coupled to the entrance pupil of the AR glasses to be measured is improved, and the target objects with the same size can be provided for different fields.
The invention is based on the wide-angle projection lens, and also provides a detection device for detecting the optical waveguide AR lens, wherein the detection device comprises the wide-angle projection lens.
Claims (9)
1. The utility model provides a wide angle projection lens for optical waveguide AR lens detects which characterized in that includes from last down in proper order: preceding lens group, diaphragm trompil and back lens group, preceding lens group become virtual diaphragm with the projection of diaphragm trompil to the camera lens foremost, and preceding lens group includes from last to down in proper order: a turning prism, a fourth lens, a fifth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens;
the fourth lens is a meniscus lens, the fifth lens is a biconvex lens, the seventh lens is a biconvex lens or a convex-concave lens, the eighth lens and the ninth lens are convex-concave lenses, and the tenth lens is a convex-concave lens;
the multiplying power beta of the front lens group satisfies: 1.8< β < 3.0;
back lens group is from last to including down in proper order: an eleventh lens, a fourth cemented lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens; the eleventh lens and the fourteenth lens are both double-convex lenses, the fifteenth lens is a meniscus lens, and the sixteenth lens is a double-concave lens;
the fourth cemented lens is composed of a twelfth lens and a seventeenth lens which are cemented, the twelfth lens is a biconvex lens, and the seventeenth lens is a biconcave lens.
2. The wide-angle projection lens for optical waveguide AR lens inspection of claim 1, wherein the front lens set further comprises a first cemented lens disposed at the front end of the turning prism, a third lens disposed between the turning prism and the fourth lens, and a sixth lens disposed between the fifth lens and the seventh lens;
the first cemented lens is composed of a first cemented lens and a second cemented lens, the first lens is a plano-concave lens, the second lens is a biconvex lens, the third lens is a plano-convex lens, the third lens and the turning prism are cemented into the second cemented lens, the sixth lens is a concave-convex lens, and the sixth lens and the fifth lens are cemented into the third cemented lens;
the fourth cemented lens or the twelfth lens and the thirteenth lens which are cemented, the thirteenth lens being a meniscus lens.
3. The wide-angle projection lens for optical waveguide AR lens inspection of claim 2, wherein the combined focal length f12 of the first cemented lens relative to the focal length f of the wide-angle projection lens satisfies the following relationship:
-2<f12/f<-1；
the third lens satisfies the following conditional expression:
1＜|f4/r7|＜3；
where f4 denotes a focal length of the third lens, and r7 denotes a radius of curvature of a lower surface of the third lens.
4. The wide-angle projection lens for optical waveguide AR lens inspection of claim 1, wherein the fourth lens satisfies the following conditional expression:
1＜|f5/r9|＜3；
where f5 denotes a focal length of the fourth lens, and r9 denotes a radius of curvature of a lower surface of the fourth lens.
5. The wide-angle projection lens for optical waveguide AR lens inspection of claim 1, wherein the eighth lens thickness d9 satisfies the following conditional expression:
0.1＜|d9/f9|＜0.25；
where f9 denotes a focal length of the eighth lens, and d9 denotes a thickness of the eighth lens.
6. The wide-angle projection lens for optical waveguide AR lens inspection of claim 1, wherein the tenth lens thickness d11 satisfies the following conditional expression:
0.15＜|d11/f11|＜0.2；
where f11 denotes a focal length of the tenth lens, and d11 denotes a thickness of the tenth lens.
7. The wide-angle projection lens for optical waveguide AR lens inspection of claim 1, wherein the sixteenth lens satisfies the following conditional expression:
-0.8＜f17/r31＜-0.5；
0.5＜f17/r32＜0.8；
where f17 denotes a focal length of the sixteenth lens, and r31 and r32 denote radii of curvature of upper and lower surfaces of the sixteenth lens, respectively.
8. The wide-angle projection lens for optical waveguide AR lens inspection of claim 1 wherein the combined focal length f13 of the front lens group satisfies the following relationship:
-3<f13/f<-2；
the combined focal length f14 of the back lens group satisfies the following relationship:
3<f/f14<5；
wherein f is the focal length of the wide-angle projection lens;
the refractive index of the folding prism is n = 1.85.
9. A detection device for optical waveguide AR lens detection, characterized in that the detection device comprises a wide-angle projection lens according to any of claims 1-8.
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| CN115855447B (en) * | 2022-11-18 | 2024-01-23 | 茂莱（南京）仪器有限公司 | Projection lens for detecting large-view-field optical waveguide AR glasses with different diopters |
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