CN114280787A - Bi-pass optical system, lens module and VR equipment - Google Patents
Bi-pass optical system, lens module and VR equipment Download PDFInfo
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Abstract
The invention discloses a double-pass optical system which is used for visible light imaging and infrared light imaging, and comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side along an optical axis direction; the first lens, the second lens and the sixth lens are concave lenses; the third lens, the fourth lens, the fifth lens and the seventh lens are convex lenses; the optical system satisfies the following formula: 5.5F < | F1| < 6.6F, 1.7F < | F2| < 1.98F, 6.48F < | F3| < 9.95F, 2.30F < | F4| < 3.39F, 1.32F < | F5| < 1.54F, 1.34F < | F6| < 1.72F, 3.02F < | F7| < 5.28F; where F is a focal length of the double-pass optical system, F1 is a focal length of the first lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, F4 is a focal length of the fourth lens, F5 is a focal length of the fifth lens, F6 is a focal length of the sixth lens, and F7 is a focal length of the seventh lens. According to the invention, the focal lengths of the first lens to the seventh lens are reasonably configured, so that the diameter of the maximum imaging circle is larger than the length of the diagonal of the photosensitive device, the occurrence of a dark corner can be effectively avoided, and the imaging effect is good.
Description
Technical Field
The invention belongs to the field of optical imaging, and particularly relates to a bi-pass optical system, a lens module and VR equipment.
Background
The head-mounted display provides panoramic video to a user through an optical system to perform relevant interaction and operation, so as to bring people to experience personally on the scene, and the technology is widely applied to the fields of entertainment, medical treatment, education and the like.
In order to ensure the MTF value of a lens of a head-mounted display commonly used in the industry at present, the maximum imaging circle of the lens is set to be 2.2 mm and is smaller than the diagonal length of a photosensitive device by 2.4 mm, and dark corners are formed around the photosensitive device due to mismatching, so that the capturing precision of an algorithm is influenced.
Disclosure of Invention
The invention aims to provide a double-pass optical system to solve the problem that the periphery of a photosensitive device is provided with a dark corner.
In order to achieve the above object, a first aspect of the present invention provides a double-pass optical system for visible light imaging and infrared light imaging, the double-pass optical system including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the first lens, the second lens and the sixth lens are concave lenses; the third lens, the fourth lens, the fifth lens and the seventh lens are convex lenses;
the optical system satisfies the following formula:
5.5F<|f1|<6.6F，1.7F<|f2|<1.98，6.48F<|f3|<9.95，2.30F<|f4|<3.39，1.32F<|f5|<1.54，1.34F<|f6|<1.72，3.02F<|f7|<5.28；
where F is a focal length of the double-pass optical system, F1 is a focal length of the first lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, F4 is a focal length of the fourth lens, F5 is a focal length of the fifth lens, F6 is a focal length of the sixth lens, and F7 is a focal length of the seventh lens.
Preferably, the first lens is a glass lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.
Preferably, the double-pass optical system further includes a diaphragm located between the third lens and the fourth lens or between the fourth lens and the fifth lens.
Preferably, the refractive index of the first lens is greater than 1.6 and less than 1.8, and the abbe number of the first lens is greater than 20 and less than 50.
Preferably, the refractive indexes of the second lens, the fourth lens and the fifth lens are all more than 1.3 and less than 1.6; the second lens, the fourth lens and the fifth lens all have an abbe number greater than 30 and less than 60.
Preferably, the refractive indexes of the third lens, the sixth lens and the seventh lens are all more than 1.4 and less than 1.7; the third lens, the sixth lens and the seventh lens all have an abbe number greater than 20 and less than 50.
Preferably, the optical system satisfies the following formula:
wherein F is a focal length of the double-pass optical system, R11 is a radius of curvature of the object-side surface of the first lens, R21 is a radius of curvature of the object-side surface of the second lens, R31 is a radius of curvature of the object-side surface of the third lens, R41 is a radius of curvature of the object-side surface of the fourth lens, R51 is a radius of curvature of the object-side surface of the fifth lens, R61 is a radius of curvature of the object-side surface of the sixth lens, and R71 is a radius of curvature of the object-side surface of the seventh lens; or
The optical system satisfies the following formula:
wherein F is the focal length of the double-pass optical system, R12 is the radius of curvature of the image-side surface of the first lens element, R22 is the radius of curvature of the image-side surface of the second lens element, R32 is the radius of curvature of the image-side surface of the third lens element, R42 is the radius of curvature of the image-side surface of the fourth lens element, R52 is the radius of curvature of the image-side surface of the fifth lens element, R62 is the radius of curvature of the image-side surface of the sixth lens element, and R72 is the radius of curvature of the image-side surface of the seventh lens element.
Preferably, the total optical length TTL of the double-pass optical system is greater than 6mm and less than 8mm, the ratio of the focal length to the clear aperture of the optical system is 2.2, the maximum field angle is 160 degrees, and the diameter of the maximum imaging circle is 2.7 mm.
In a second aspect, the present invention further provides a lens module for a VR device, including a barrel and the dual-pass optical system of the first aspect, wherein the first to seventh lenses of the dual-pass optical system are mounted in the barrel.
In a third aspect, the invention further provides a VR device, which includes the lens module of the second aspect, and the lens module is disposed in the housing.
Compared with the prior art, the focal lengths of the first lens to the seventh lens are reasonably configured, so that the diameter of the maximum imaging circle is larger than the length of the diagonal of the photosensitive device, the dark corner can be effectively avoided, the MTF value under the full frequency is up to more than 40%, the imaging effect is good, in addition, infrared rays are considered in the design of the bi-pass optical system, and the optical system can be used for visible light and infrared light at the same time.
Drawings
FIG. 1 is a schematic structural diagram of a double-pass optical system according to an embodiment of the present invention.
FIG. 2 is an optical path diagram of a two-pass optical system according to an embodiment of the present invention.
FIG. 3 is a graph of the MTF at one-quarter full frequency for a dual-pass optical system according to an embodiment of the present invention.
FIG. 4 is a graph of the MTF at one-half full frequency for a two-pass optical system according to an embodiment of the present invention.
FIG. 5 is a graph of MTF for the full range of the dual-pass optical system according to the embodiment of the present invention.
FIG. 6 is a defocus graph of a double-pass optical system according to an embodiment of the present invention.
FIG. 7 is a field curvature diagram of a double-pass optical system according to an embodiment of the present invention.
FIG. 8 is a distortion plot of a two-pass optical system in accordance with an embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following detailed description is given with reference to the embodiments and the accompanying drawings.
As shown in fig. 1 to 2, a double-pass optical system according to an embodiment of the present invention is used for visible light imaging and infrared light imaging, and includes, in order from an object side to an image side along an optical axis, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70; the first lens 10, the second lens 20 and the sixth lens 60 are concave lenses; the third lens 30, the fourth lens 40, the fifth lens 50 and the seventh lens 70 are convex lenses;
the optical system satisfies the following formula:
5.5F<|f1|<6.6F，1.7F<|f2|<1.98F，6.48F<|f3|<9.95F，
2.30F<|f4|<3.39F，1.32F<|f5|<1.54F，1.34F<|f6|<1.72F，
3.02F<|f7|<5.28F；
wherein F is a focal length of the double-pass optical system, F1 is a focal length of the first lens 10, F2 is a focal length of the second lens 20, F3 is a focal length of the third lens 30, F4 is a focal length of the fourth lens 40, F5 is a focal length of the fifth lens 50, F6 is a focal length of the sixth lens 60, and F7 is a focal length of the seventh lens 70.
Specifically, the value of F is preferably 0.907mm, the value of F1 is preferably-5.584 mm, the value of F2 is preferably-1.672 mm, the value of F3 is preferably 8.031mm, the value of F4 is preferably 2.619mm, the value of F5 is preferably 1.242mm, the value of F6 is preferably-1.252, and the value of F7 is preferably 3.584 mm.
In an embodiment of the present invention, the first lens element 10 is a glass lens element, the first lens element 10 includes a first image-side surface and a first object-side surface, the first image-side surface and the first object-side surface are both spherical surfaces, and the second lens element 20, the third lens element 30, the fourth lens element 40, the fifth lens element 50, the sixth lens element 60, and the seventh lens element 70 are all plastic lenses. Design first lens 10 for the glass material, can need not to set up in addition the glass lid protection, first lens 10 can directly expose outside the product, has the function of anti fish tail, has effectively simplified the structure.
In other embodiments, the first lens may also be designed as an aspherical mirror, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may also be made of glass, and may be determined according to actual design requirements.
In the embodiment of the present invention, as shown in fig. 1 to fig. 2, the double-pass optical system further includes a diaphragm 80, and the diaphragm 80 is located between the third lens 30 and the fourth lens 40. In other embodiments, the stop 80 may be located between the fourth lens 40 and the fifth lens 50.
In the embodiment of the present invention, the refractive index of the first lens 10 is greater than 1.6 and less than 1.8, and the abbe number of the first lens 10 is greater than 20 and less than 50.
In the embodiment of the present invention, the refractive indexes of the second lens 20, the fourth lens 40 and the fifth lens 50 are all greater than 1.3 and less than 1.6; the second lens 20, the fourth lens 40 and the fifth lens 50 all have an abbe number greater than 30 and less than 60.
In the embodiment of the present invention, the refractive indexes of the third lens 30, the sixth lens 60, and the seventh lens 70 are all greater than 1.4 and less than 1.7; the third lens 30, the sixth lens 60, and the seventh lens 70 each have an abbe number greater than 20 and less than 50.
In the embodiment of the invention, the double-pass optical system meets the following formula:
where F is a focal length of the double-pass optical system, R11 is a radius of curvature of the object-side surface of the first lens element 10, R21 is a radius of curvature of the object-side surface of the second lens element 20, R31 is a radius of curvature of the object-side surface of the third lens element 30, R41 is a radius of curvature of the object-side surface of the fourth lens element 40, R51 is a radius of curvature of the object-side surface of the fifth lens element 50, R61 is a radius of curvature of the object-side surface of the sixth lens element 60, and R71 is a radius of curvature of the object-side surface of the seventh lens element 70.
Specifically, the value of R11 is preferably 4.925mm, the value of R21 is preferably 7.757mm, the value of R31 is preferably 2.44mm, the value of R41 is preferably-51.322 mm, the value of R51 is preferably 1.17mm, the value of R61 is preferably-1.006 mm, and the value of R71 is preferably 1.337 mm. The values of R11, R21, R31, R41, R51, R61 and R71 may be varied in their respective preferred values, for example, in an amplitude of 0.3mm, as long as the above formula is satisfied.
In the embodiment of the present invention, the optical system satisfies the following formula:
where F is a focal length of the optical system, R12 is a radius of curvature of the image-side surface of the first lens element 10, R22 is a radius of curvature of the image-side surface of the second lens element 20, R32 is a radius of curvature of the image-side surface of the third lens element 30, R42 is a radius of curvature of the image-side surface of the fourth lens element 40, R52 is a radius of curvature of the image-side surface of the fifth lens element 50, R62 is a radius of curvature of the image-side surface of the sixth lens element 60, and R72 is a radius of curvature of the image-side surface of the seventh lens element 70.
Specifically, the value of R12 is preferably 2.23mm, the value of R22 is preferably 0.792mm, the value of R32 is preferably 4.288mm, the value of R42 is preferably-1.374 mm, the value of R52 is preferably-1.237 mm, the value of R62 is preferably 4.104mm, and the value of R72 is preferably 3.487 mm. The values of the R12, R22, R32, R42, R52, R62 and R72 can be fluctuated at respective optimized values, for example, the fluctuation range is 0.3mm, as long as the above formula is satisfied.
In the embodiment of the invention, the total optical length TTL of the double-pass optical system is more than 6mm and less than 8 mm.
Specifically, the distance CT1 (i.e., the thickness of the first lens element) between the geometric center of the object-side optical axis of the first lens element and the geometric center of the image-side optical axis thereof is 0.578mm, the distance CT2 (i.e., the thickness of the second lens element) between the geometric center of the object-side optical axis of the second lens element and the geometric center of the image-side optical axis thereof is 0.336mm, the distance CT3 (i.e., the thickness of the third lens element) between the geometric center of the object-side optical axis of the third lens element and the geometric center of the image-side optical axis thereof is 0.5mm, the distance CT4 (i.e., the thickness of the fourth lens element) between the geometric center of the object-side optical axis of the fourth lens element and the geometric center of the image-side optical axis thereof is 0.6mm, the distance CT5 (i.e., the thickness of the fifth lens element) between the geometric center of the object-side optical axis of the fifth lens element and the geometric center of the image-side optical axis thereof is 0.676mm, and the distance CT6 (i.e., the thickness of the sixth lens element) between the geometric center of the object-side optical axis thereof is 0.163mm, the distance CT7 (namely the thickness of the seventh lens) between the geometric center of the optical axis of the object side surface of the seventh lens and the geometric center of the optical axis of the image side surface of the seventh lens is 0.78mm, the optical system further comprises a parallel flat plate 90, and the thickness of the parallel flat plate 90 is 0.21 mm; the distance DT1 between the geometric center of the image-side surface optical axis of the first lens element and the geometric center of the object-side surface optical axis of the second lens element (i.e. the distance between the first lens element and the second lens element), the distance DT2 between the geometric center of the image-side surface optical axis of the second lens element and the geometric center of the object-side surface optical axis of the third lens element (i.e. the distance between the second lens element and the third lens element), the distance DT3 between the geometric center of the image-side surface optical axis of the second lens element and the geometric center of the object-side surface optical axis of the third lens element (i.e. the distance between the third lens element and the fourth lens element) is 0.623mm, the distance DT4 between the geometric center of the image-side surface optical axis of the fourth lens element and the geometric center of the object-side surface optical axis of the fifth lens element (i.e. the distance between the fourth lens element and the fifth lens element) is 0.058mm, the distance DT5 between the geometric center of the image-side surface optical axis of the fifth lens element and the object-side surface optical axis of the sixth lens element (i.e. the distance between the fifth lens element and the sixth lens element) is 0.076mm, the distance DT6 (i.e. the distance between the sixth lens element and the seventh lens element) between the geometric center of the image-side surface optical axis of the sixth lens element and the geometric center of the object-side surface optical axis of the seventh lens element is 0.178mm, the distance DT7 (i.e. the distance between the seventh lens element and the parallel plate 90) between the geometric center of the image-side surface optical axis of the seventh lens element and the geometric center of the object-side surface optical axis of the parallel plate 90 is 0.194mm, the distance between the parallel plate and the photosensitive device is greater than 0.3mm and less than 0.4mm, and the distances CT1, CT2, CT3, CT4, CT5, CT6 and CT7 can fluctuate on their respective values, for example, the fluctuation range is plus or minus 0.1mm, and the range of DT1, DT2, DT3, DT4, DT5, DT6 and DT7 can fluctuate on their respective values, for example, the range is 0.05mm, as long as the optical total length is guaranteed to be between 6mm and 8 mm.
In the embodiment of the invention, the ratio of the focal length to the clear aperture of the double-pass optical system is 2.2, the maximum field angle is 160 degrees, and the maximum imaging circle is 2.7 millimeters.
Specifically, the invention adopts Zemax software to carry out optical design during design, the distance between the geometric center of the optical axis of an object and the double geometric centers of the optical axis of the object side surface of the first lens is 500mm, the F # (the ratio of the focal length of the lens to the light aperture) of the light-passing optical system is set to be 2.2, the maximum half field angle is set to be 80 degrees, the maximum full field angle is set to be 160 degrees, the wavelength is sequentially set to be six values of 0.65mm, 0.61mm, 0.555mm, 0.51mm, 0.47mm and 0.85mm, wherein 0.85mm is the infrared wavelength and can be used for working under infrared light, and the maximum imaging circle is 2.7 mm and is 2.4 mm larger than the diagonal length of a sensing device, so that the dark angle condition does not exist and the capture precision of the algorithm cannot be influenced.
Fig. 3 to 5 show MTFs at full quarter of the meridian (full of Modulation Transfer Function), full of half of the meridian) at the main optical axis (i.e., TS0.00(deg)), 9.40 degrees (i.e., TS9.40(deg)), 18.80 degrees (i.e., TS18.80(deg)), 28.20 degrees (i.e., TS28.20(deg)), 37.60 degrees (i.e., TS37.60(deg)), 47.00 degrees (i.e., TS47.00(deg)), 56.40 degrees (i.e., TS56.40(deg)), 65.80 degrees (i.e., TS65.80(deg)), 75.20 degrees (i.e., TS75.20(deg)), and 80.00 degrees (i.e., TS80.00(deg)), respectively, which show that the MTFs at the meridian and the sagittal vectors at the meridian are closer to the meridional ray transition Function, the Modulation Transfer Function, the full of the meridian) of the meridian, the meridian (T) of the meridian is better than the meridional ray imaging at the meridian (S) of the meridian (90), the MTF value under half full frequency reaches more than 70%, and the MTF value under full frequency reaches more than 40%, so that the imaging effect of the bi-pass optical system is very good.
FIG. 6 is a defocus graph of the double-pass optical system of this embodiment, and it can be seen from the curves that the curves are mainly concentrated on both sides of the central axis at the 0 position on the abscissa, which shows that the sharpness of the double-pass optical system is very good.
Fig. 7 is a field curvature diagram of the double-pass optical system of the present embodiment, and it can be seen that the absolute value of the field curvature of the double-pass optical system is within 0.05mm, the field curvature is very small, and the whole imaging is clear.
Fig. 8 is an optical distortion curve of the double-pass optical system of the present embodiment, where the distortion curve is smooth, the change from the inner view field to the outer view field is stable, and the image distortion is small.
The invention also provides a lens module used for VR equipment, the lens module comprises a lens barrel and the double-pass optical system provided by the embodiment of the invention, the first lens to the seventh lens of the double-pass optical system are arranged in the lens barrel, and the lens module is an imaging module on the VR equipment. By installing the first lens to the seventh lens of the double-pass optical system provided by the embodiment in the lens module, the imaging effect of each field of view is very good, and no dark corner occurs.
The invention also provides VR equipment, which comprises a shell and the lens module provided by the embodiment of the invention, wherein the lens module is arranged in the shell. By arranging the lens module in the VR equipment, the imaging effect of each field of view is very good, and no dark corner occurs.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.
Claims (10)
1. A double-pass optical system for visible light imaging and infrared light imaging, comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the first lens, the second lens and the sixth lens are concave lenses; the third lens, the fourth lens, the fifth lens and the seventh lens are convex lenses;
the optical system satisfies the following formula:
5.5F<|f1|<6.6F，1.7F<|f2|<1.98F，6.48F<|f3|<9.95F，2.30F<|f4|<3.39F，1.32F<|f5|<1.54F，1.34F<|f6|<1.72F，3.02F<|f7|<5.28F；
wherein F is a focal length of the double pass optical system, F1 is a focal length of the first lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, F4 is a focal length of the fourth lens, F5 is a focal length of the fifth lens, F6 is a focal length of the sixth lens, and F7 is a focal length of the seventh lens.
2. The double pass optical system of claim 1, wherein the first lens is a glass lens, and the second, third, fourth, fifth, sixth and seventh lenses are plastic lenses.
3. The double-pass optical system as claimed in claim 1, further comprising a diaphragm, which is located between the third lens and the fourth lens or between the fourth lens and the fifth lens.
4. The double-pass optical system according to claim 2, wherein said first lens has a refractive index greater than 1.6 and less than 1.8, and an abbe number greater than 20 and less than 50.
5. The double pass optical system of claim 2, wherein the refractive indices of the second lens, the fourth lens and the fifth lens are each greater than 1.3 and less than 1.6; and the dispersion coefficients of the second lens, the fourth lens and the fifth lens are all more than 30 and less than 60.
6. The double pass optical system of claim 2, wherein the refractive indices of the third lens, the sixth lens and the seventh lens are each greater than 1.4 and less than 1.7; and the dispersion coefficients of the third lens, the sixth lens and the seventh lens are all more than 20 and less than 50.
7. The double-pass optical system as claimed in claim 1, wherein said double-pass optical system satisfies the following formula:
wherein F is a focal length of the double-pass optical system, R11 is a radius of curvature of an object-side surface of the first lens, R21 is a radius of curvature of an object-side surface of the second lens, R31 is a radius of curvature of an object-side surface of the third lens, R41 is a radius of curvature of an object-side surface of the fourth lens, R51 is a radius of curvature of an object-side surface of the fifth lens, R61 is a radius of curvature of an object-side surface of the sixth lens, and R71 is a radius of curvature of an object-side surface of the seventh lens; or the like, or, alternatively,
the double-pass optical system satisfies the following formula:
wherein F is a focal length of the double-pass optical system, R12 is a radius of curvature of the image-side surface of the first lens element, R22 is a radius of curvature of the image-side surface of the second lens element, R32 is a radius of curvature of the image-side surface of the third lens element, R42 is a radius of curvature of the image-side surface of the fourth lens element, R52 is a radius of curvature of the image-side surface of the fifth lens element, R62 is a radius of curvature of the image-side surface of the sixth lens element, and R72 is a radius of curvature of the image-side surface of the seventh lens element.
8. The dual-pass optical system as claimed in claim 1, wherein the total optical length TTL of the dual-pass optical system is greater than 6mm and less than 8mm, the ratio of the focal length to the clear aperture of the optical system is 2.2, the maximum field angle is 160 degrees, and the diameter of the maximum imaging circle is 2.7 mm.
9. A lens module for a VR device, comprising a barrel and the double-pass optical system of any one of claims 1 to 8, the first lens to the seventh lens of the double-pass optical system being mounted in the barrel.
10. A VR device comprising a housing and the lens module of claim 9, the lens module being disposed within the housing.
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| CN202067014U (en) * | 2011-02-18 | 2011-12-07 | 大立光电股份有限公司 | Wide-angle optical system |
| US20160085054A1 (en) * | 2014-09-19 | 2016-03-24 | Fujifilm Corporation | Imaging lens and imaging apparatus |
| CN113376805A (en) * | 2021-06-16 | 2021-09-10 | 上海摩软通讯技术有限公司 | Optical lens and electronic device |
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|---|---|---|---|---|
| JP2010169792A (en) * | 2009-01-21 | 2010-08-05 | Olympus Corp | Optical element and optical unit using the same |
| CN101937124A (en) * | 2009-06-30 | 2011-01-05 | 比亚迪股份有限公司 | Optical lens component |
| CN202067014U (en) * | 2011-02-18 | 2011-12-07 | 大立光电股份有限公司 | Wide-angle optical system |
| US20160085054A1 (en) * | 2014-09-19 | 2016-03-24 | Fujifilm Corporation | Imaging lens and imaging apparatus |
| CN113376805A (en) * | 2021-06-16 | 2021-09-10 | 上海摩软通讯技术有限公司 | Optical lens and electronic device |
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