CN216013817U - Low-light level night vision device with eyepiece having large exit pupil diameter - Google Patents
Low-light level night vision device with eyepiece having large exit pupil diameter Download PDFInfo
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- CN216013817U CN216013817U CN202122424056.8U CN202122424056U CN216013817U CN 216013817 U CN216013817 U CN 216013817U CN 202122424056 U CN202122424056 U CN 202122424056U CN 216013817 U CN216013817 U CN 216013817U
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Abstract
The utility model discloses a glimmer night vision device with an eyepiece having a large exit pupil diameter, which comprises a glimmer image intensifier and an eyepiece, wherein the glimmer image intensifier is arranged in the object-side direction of the eyepiece and shares the same optical axis with the eyepiece, and the diameter of the glimmer image intensifier is smaller than or equal to 18 mm; the eyepiece is provided with along the optical axis from the image side to the object side in order: a first lens having a positive optical power, the first lens being a biconvex lens; a second lens with negative focal power, wherein the second lens is a concave-convex lens, the concave surface of the second lens is close to the object side, and the convex surface of the second lens is close to the image side; a third lens having a positive optical power, the third lens being a biconvex lens; all lenses are aspheric lenses. The utility model discloses a full angle of vision of diagonal angle of eyepiece is 50 °, and exit pupil diameter is 18mm, can reach the observation scope of people's eye to can full play people's eye resolution ability. The utility model discloses an eyepiece has whole quick-witted size of shimmer night-time vision device of big exit pupil diameter little, light in weight, simple structure and portability are good.
Description
Technical Field
The embodiment of the utility model provides a relate to optics technical field, in particular to eyepiece has shimmer night-time vision device of big exit pupil diameter.
Background
As is well known, although the human eye is a high precision optical system, it has limitations in light intensity, spectrum and resolution capability, and cannot meet the requirements under any complicated external conditions. Generally, human eyes can sense visible light with a wavelength of 390nm to 770nm, but light rays with a wavelength higher than 770nm or lower than 390nm cannot be recognized by human eyes, for example, when visible light such as X-ray, UV light, weak star light and infrared radiation is weakened to a certain degree, the sensing capability of human eyes is also weakened, and the spectrum range at night is not in a visible light region, but the intensity of the visible light portion is not weak, so that not only the observation of human eyes is limited in spectrum and intensity, but also the resolving capability of human eyes is weakened. The analysis shows that the object is difficult to distinguish by human eyes at night, and the low-light night vision device breaks through the limitations, so that the human eyes can normally observe the target under the low-light condition at night.
In low-light night vision devices, the eyepiece is used to magnify the target image on the fluorescent screen of the image intensifier, thereby ensuring comfortable observation of human eyes. The optical characteristics of the eyepiece include the focal length, the field angle, the exit pupil diameter, the exit pupil distance and the like, and whether the parameters of the eyepiece are properly selected affects the volume, weight, magnification and field of view of the night vision device and also affects the night observation performance of the night vision device.
To obtain a larger image and satisfy the requirements of miniaturization and light weight of the whole device, the optimal proposal is to increase the observation magnification of the ocular lens. The observation magnification of the ocular is directly related to the focal length of the lens group, and the ocular is required to have higher focal power when the observation magnification of the ocular is increased. Only the standard spherical positive lens is used for forming the ocular lens, the aberration is difficult to correct, the aspheric surface technology is utilized, the aberration of the ocular lens optical system is easy to reduce, and good image quality is obtained.
In general optical observation devices, in order to ensure that the user maintains a comfortable state during a long period of use, a dual-purpose optical structure is generally used. The traditional binocular optical structure can adapt to the pupil distance of different human eyes by using a structure with adjustable pupil distance. With the development of the technology, optical instruments with binocular large exit pupil structures are gradually increased, typically as binocular night vision goggles. The larger the diameter of the exit pupil, the brighter the observed target is, which is beneficial to observation under dark and weak light, and meanwhile, under the condition of large diameter of the exit pupil, the user is not required to strictly align the optical instrument, so that the use is easier. Thus, the demand for large exit pupil diameter eyepieces is increasing.
Handheld or head-mounted devices have high weight requirements, and small weight changes can have a large impact on the use experience. In order to improve the optical performance and the imaging quality of an eyepiece optical system, in the prior art, a multi-lens combination is often adopted, and although the eyepiece optical system adopting the multi-lens combination has better optical performance and imaging quality, the eyepiece optical system has larger size, poor portability, complex structure and heavier product, which affects the user experience.
The aspheric optical element is an optical element with a surface shape deviating from a spherical surface, and has higher degree of freedom and flexibility and various shapes compared with a traditional plane and spherical optical element. Therefore, various aberrations can be effectively corrected, the image quality is improved, the number of required optical elements is reduced, the external dimension of the optical system is reduced, and the weight of the optical system is reduced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is:
to the above-mentioned defect of prior art, the to-be-solved technical problem of the utility model is to provide a shimmer night-time vision device that eyepiece has big exit pupil diameter, can be applicable to shimmer night-time vision device, its eyepiece has big exit pupil diameter to the size is little, simple structure, light in weight.
The embodiment of the utility model provides an aim at is realized through following technical scheme:
in order to solve the above technical problem, in a first aspect, the present invention provides an eyepiece including a first lens, a second lens, and a third lens, which are coaxially arranged in order from an image side to an object side.
The first lens is a biconvex lens and has positive focal power;
the second lens is a concave-convex lens with negative focal power, the concave surface of the second lens is close to the object side, and the convex surface of the second lens is close to the image side;
the third lens is a biconvex lens and has positive focal power;
the relative aperture of the first lens is larger than 1:1.1, the relative aperture of the second lens is smaller than 1: 1.4, and the relative aperture of the third lens is larger than 1: 0.8.
The first lens, the second lens and the third lens are aspheric lenses.
The radiuses of the first lens, the second lens and the third lens are all smaller than or equal to 17 mm.
The first lens, the second lens and the third lens are made of optical glass or optical resin.
In some embodiments, the effective focal length of the eyepiece is 35.3 mm.
The exit pupil distance of eyepiece is more than or equal to 20mm, the exit pupil diameter of eyepiece is more than or equal to 18 mm.
The diagonal full field angle of the eyepiece is greater than or equal to 50 °.
In order to solve the above technical problem, the second aspect of the present invention provides a low-light level night vision device with an eyepiece having a large exit pupil diameter, including: shimmer image intensifier and foretell eyepiece, wherein, shimmer image intensifier set up in the object side direction of eyepiece and with eyepiece optical axis altogether, just shimmer image intensifier diameter is less than or equal to 18 mm.
In some embodiments, the low-light image intensifier image height is 9 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an eyepiece has shimmer night-time vision device of big exit pupil diameter, and the angle of diagonal full field of this eyepiece is 50 °, and exit pupil diameter is 18mm, can reach the observation scope of people's eye to can full play people's eye resolution ability. The utility model discloses an eyepiece has whole quick-witted size of shimmer night-time vision device of big exit pupil diameter little, light in weight, simple structure and portability are good.
Drawings
Fig. 1 is a schematic view of the eyepiece structure with a large exit pupil diameter according to the present invention.
Fig. 2 is an MTF graph of the eyepiece optical system shown in fig. 1, in which a T diff.limit curve and an R diff.limit curve are in a coincident state; the T (ANG)0.000deg curve also coincided with the R (ANG)0.000deg curve.
Figure 3 is a graph of axial aberration, curvature of field, and distortion for the eyepiece shown in figure 1 with a large exit pupil diameter.
Figure 4 is a stippled view of the eyepiece shown in figure 1 having a large exit pupil diameter.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist the skilled person in further understanding the invention, but are not intended to limit the invention in any way. It should be particularly noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
In order to make the purpose, technical solution and features of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described are merely illustrative of the present application and are not intended to limit the present application.
Furthermore, the terms "first," "second," "third," and the like, as used herein, do not denote any order of importance, but rather denote the same or similar items having substantially the same function or effect.
In order to facilitate the definition of the connection structure, the present invention uses the light emitting direction as a reference to define the position of the optical element.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein for the purpose of describing particular embodiments only is for the purpose of limiting the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
As shown in fig. 1, the present invention provides a schematic structural diagram of an eyepiece with a large exit pupil diameter, which includes a coaxial line sequentially arranged from the object side to the image side: a first lens E1, a second lens E2, and a third lens E3.
The first lens element E1 is a biconvex lens with positive power, and has a convex surface S1 close to the object side and a convex surface S2 close to the image side.
The second lens E2 is a meniscus lens with negative power, and has a convex surface S3 close to the object side and a convex surface S4 close to the image side of the first lens E1.
The third lens element E3 is a biconvex lens with positive power, and has a convex surface S5 close to the object side and a convex surface S6 close to the image side.
The relative aperture of the first lens E1 is larger than 1:1.1, the relative aperture of the second lens E2 is smaller than 1: 1.4, and the relative aperture of the third lens E3 is larger than 1:0.8, so that the light transmission amount of the eyepiece is ensured.
The relative aperture of the first lens E1 is as follows: 1:1.03, and the relative aperture of the second lens E2 is as follows: 1-1.41, and the relative aperture of the third lens E3 is: 1:0.76.
Each lens of the eyepiece may be a separate lens or a cemented doublet.
In the embodiment of the present invention, the material of the first lens E1, the second lens E2, and the third lens E3 is optical resin, which is light and easy to process.
In other embodiments, each lens material of the eyepiece may be replaced with optical glass.
Wherein the surface parameters of each lens of the eyepiece can be set to appropriate values. In the embodiment of the present invention, the surface parameters of the eyepiece are shown in table 1.
TABLE 1 surface parameters of lenses in eyepiece
Wherein the first lens E1, the second lens E2 and the third lens E3 are all aspheric lenses.
The aspherical conical coefficients and the aspherical coefficients of each order of each lens may be set to appropriate values. The embodiment of the present invention provides an aspheric cone coefficient value and each order aspheric coefficient of each lens are shown in table 2, wherein K is aspheric cone coefficient, and a1, a2, a3, a4, a5 correspond 2, 4, 6, 8, 10 order aspheric coefficients respectively.
TABLE 2 aspheric conic coefficients and order aspheric coefficients for each lens in the eyepiece
| Flour mark | K | a1 | a2 | a3 | a4 | a5 |
| S1 | -0.3218 | 0 | 1.53091e-005 | -1.03033e-007 | -3.51345 |
0 |
| S2 | -51.398297 | 0 | 4.31871e-005 | -2.65305e-007 | 1.707299 |
0 |
| S3 | -5.304451 | 0 | -9.58433e-008 | 4.182985e-008 | 2.60832e-010 | 0 |
| S4 | -3.214397 | 0 | -4.357321e-005 | 3.467025e-008 | 1.10739e-010 | -3.18178e-013 |
| S5 | -0.87532 | 0 | -4.842003e-005 | 4.662189e-007 | -2.9091 |
0 |
| S6 | 2.17924 | 0 | 9.345653e-005 | 1.715752e-008 | -3.393829e-009 | 1.2502276e-011 |
In other embodiments, the first lens E1, the second lens E2, and the third lens E3 may be spherical mirrors.
Based on the above structure, the optical performance parameters of the eyepiece are shown in table 3.
TABLE 3 optical Performance parameters of the eyepiece
| Angle of view | Effective focal length | Diameter of exit pupil | Distance of exit pupil |
| 50° | 35.3mm | 18mm | 20mm |
As can be seen from table 3, the effective focal length of the eyepiece is 20mm and the exit pupil distance is 25 mm. The diagonal full field angle of the eyepiece is 50 degrees, the diameter of the exit pupil is 18mm, the observation range of human eyes can be reached, and therefore the resolving power of the human eyes can be fully exerted.
In some other embodiments, the eyepiece with a large exit pupil diameter further comprises a low-light image intensifier disposed at an image side of the eyepiece and coaxial with the eyepiece for providing an image source.
The image intensifier used therein is an active device, and no other illumination light source is needed.
In this embodiment, the radius of the image intensifier is 9 mm.
In other embodiments, the size of the image intensifier may be varied according to particular needs.
The imaging quality of the eyepiece having a large exit pupil diameter is examined below.
As shown in fig. 2, the MTF (modulation transfer function) can reflect the imaging quality of the optical system, and specifically, the larger the area enclosed by the x-axis below the MTF curve, the smoother the transition of the MTF curve, and the better the imaging quality of the optical system. As can be seen from the figure, the MTF curve transition for the main field is smooth, and the MTF for this eyepiece with a large exit pupil diameter is >0.26 at a side frequency of 40 line pairs/mm. For the eyepiece having a large exit pupil diameter, it can be considered that the optical system has a good imaging effect, that is, the aberration of the eyepiece having a large exit pupil diameter in the present embodiment is well corrected, and the imaging quality is good.
As shown in fig. 3, the left side is the axial aberration curve, the middle is the field curve, and the right side is the distortion curve. The field curvature is an aberration of an object plane forming a curved surface image, and is characterized by tangential and sagittal field curvatures, and the imaging quality of off-axis rays of an optical system is seriously influenced by the excessive tangential and sagittal field curvatures. From figure 3 we can see that the axial aberrations are not large for an eyepiece with a large exit pupil diameter. The curvature of field is in the range of ± 0.15mm, i.e., the curvature of field of the eyepiece having a large exit pupil diameter has been corrected to a smaller range. Meanwhile, when the distortion of the system is less than 4%, the human eye is hardly noticeable, and as can be seen from fig. 3, the maximum distortion of the eyepiece having a large exit pupil diameter is less than 40%, so that the human eye can perceive the distortion, but a large field of view is obtained.
As shown in fig. 4, the point diagram reflects the imaging geometry of the optical system, and in the image quality evaluation, the image quality is very intuitively reflected by the density of the point diagram, and the smaller the RMS radius in the point diagram, the better the imaging quality of the system is proved by the smaller the aberration. From fig. 4, it can be seen that the RMS radius is controlled within 0.1mm, the size of the spot radius of each field is not changed greatly, aberration correction is good, and the imaging quality of the eyepiece with a large exit pupil diameter is good.
According to the data, the eyepiece with the large exit pupil diameter is simple in structure, good in aberration correction and good in imaging quality.
The embodiment of the utility model provides an eyepiece has shimmer night-time vision device of big exit pupil diameter, this eyepiece include from the thing side to the first lens, second lens and the third lens that the coaxial axis set gradually between the image side, and all lenses all have positive focal power and be biconvex lens, the embodiment of the utility model provides an eyepiece light in weight simple structure and easily manufacturing.
Finally, the description is as follows: the above embodiments are only used for illustrating the technical solution of the present invention, and are not limited thereto; on the basis of the present invention, the idea is continued, the technical features in the above embodiments or different embodiments can be combined, and the order of the steps is not limited, and there are other variations of the present invention as described above in different aspects, which are not mentioned in detail for simplicity of explanation; the description of the present invention is made in accordance with the foregoing embodiments, and those skilled in the art will understand that: modifications to the embodiments described above, or equivalents of some features may be made without substantially departing from the scope of the embodiments of the present invention.
Claims (9)
1. The low-light-level night vision device with the eyepiece having the large exit pupil diameter comprises a low-light-level image intensifier and is characterized by further comprising the eyepiece, wherein the low-light-level image intensifier is arranged at the object side of the eyepiece and shares a common optical axis with the eyepiece, and the diameter of the low-light-level image intensifier is smaller than or equal to 18 mm; the eyepiece includes disposed in order from an image side to an object side along an optical axis:
a first lens having a positive optical power, the first lens being a biconvex lens;
a second lens with negative focal power, wherein the second lens is a concave-convex lens, the concave surface of the second lens is close to the object side, and the convex surface of the second lens is close to the image side;
a third lens having a positive optical power, the third lens being a biconvex lens.
2. The low-light night vision device of claim 1, wherein the first lens relative aperture is greater than 1:1.1, the second lens relative aperture is less than 1: -1.4, and the third lens relative aperture is greater than 1: 0.8.
3. The night vision device of claim 1, wherein the first, second and third lenses are aspheric lenses.
4. The night vision device of claim 1, wherein the first, second and third lenses each have a radius of less than or equal to 17 mm.
5. The low-light night vision device of claim 2, wherein the first lens relative aperture is 1:1.03, the second lens relative aperture is 1: 1.41, and the third lens relative aperture is 1: 0.76.
6. A low-light night vision device according to any one of claims 1-5, wherein the material of the first, second and third lenses is optical glass or optical resin.
7. A low-light night vision device according to any one of claims 1-5, wherein the effective focal length of the eyepiece is 35.3 mm.
8. A low-light night vision device according to any one of claims 1-5, wherein the eyepiece has an exit pupil distance of greater than or equal to 20mm and an exit pupil diameter of greater than or equal to 18 mm.
9. A low-light night vision device according to any one of claims 1-5, wherein the full diagonal field angle of the eyepiece is greater than or equal to 50 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406410A (en) * | 2023-12-14 | 2024-01-16 | 联创电子科技股份有限公司 | Optical lens and camera module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406410A (en) * | 2023-12-14 | 2024-01-16 | 联创电子科技股份有限公司 | Optical lens and camera module |
| CN117406410B (en) * | 2023-12-14 | 2024-04-05 | 联创电子科技股份有限公司 | Optical lens and camera module |
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