CN217561814U - Day and night confocal athermalization lens - Google Patents
Day and night confocal athermalization lens Download PDFInfo
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- CN217561814U CN217561814U CN202221513896.XU CN202221513896U CN217561814U CN 217561814 U CN217561814 U CN 217561814U CN 202221513896 U CN202221513896 U CN 202221513896U CN 217561814 U CN217561814 U CN 217561814U
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Abstract
The utility model discloses a confocal no thermalization camera lens of day night, the confocal no thermalization camera lens of day night include the casing and install in the refraction lens group of casing inner chamber, refraction lens group corresponds and is in form an optical axis in the casing, wherein, refraction lens group includes first biconcave spherical lens, second meniscus spherical lens, third biconcave spherical lens, fourth biconcave spherical lens, fifth biconvex spherical lens, sixth biconvex spherical lens, seventh biconcave spherical lens and eighth meniscus spherical lens from the thing side to picture side in proper order, second meniscus spherical lens with eighth meniscus spherical lens's concave surface sets up towards picture side. The day and night confocal athermalization-free lens has low cost, large aperture and can realize infrared and high-low temperature high-quality clear imaging without focusing.
Description
Technical Field
The utility model relates to the field of optical technology, especially, relate to confocal no heat camera lens of day night.
Background
With the development of optical lens technology, the market has higher and higher requirements on high-definition athermalized and day and night dual-purpose lenses, and the demand of the vehicle-mounted security monitoring industry is higher and higher at present.
However, the day and night dual-purpose lens in the current market has a plurality of defects: the infrared defocusing amount is large, and the imaging cannot be clear at the same time in the day and at night; the # F is large, the light flux of the lens is small, and the imaging effect is influenced; the relative illumination of the lens is low, and the uniformity of an imaging surface is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a confocal no camera lens of heating day night aims at providing a low cost, big light ring and need not the confocal no heating camera lens of day night that focusing can realize infrared and high low temperature high quality clear formation of image of high temperature.
In order to achieve the above object, the utility model provides a confocal no camera lens of day night, wherein the confocal no camera lens of day night includes the casing and install in the refraction lens group of casing inner chamber, refraction lens group corresponds forms an optical axis in the casing, wherein, refraction lens group includes first biconvex spherical lens, second meniscus spherical lens, third biconcave spherical lens, fourth biconcave spherical lens, fifth biconvex spherical lens, sixth biconvex spherical lens, seventh biconcave spherical lens and eighth meniscus spherical lens from the thing side to image side in proper order, second meniscus spherical lens with eighth meniscus spherical lens's concave surface sets up towards image side.
Optionally, the first biconvex spherical lens power is positive; and/or the presence of a gas in the gas,
the focal power of the second meniscus spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the third biconcave spherical lens is negative; and/or the presence of a gas in the gas,
the focal power of the fourth biconcave spherical lens is negative; and/or the presence of a gas in the gas,
the focal power of the fifth biconvex spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the sixth biconvex spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the seventh biconcave spherical lens is negative; and/or the presence of a gas in the gas,
and the focal power of the eighth meniscus spherical lens is positive.
Optionally, at least one of the first biconcave spherical lens, the second meniscus spherical lens, the third biconcave spherical lens, the fourth biconcave spherical lens, the fifth biconvex spherical lens, the sixth biconvex spherical lens, the seventh biconcave spherical lens, and the eighth meniscus spherical lens is made of glass.
Optionally, the first biconvex spherical lens and/or the second meniscus spherical lens are made of low-refraction high-dispersion glass; and/or the presence of a gas in the gas,
the sixth biconvex spherical lens and/or the seventh biconcave spherical lens are made of high-refraction low-dispersion glass.
Optionally, the fourth biconcave spherical lens and the fifth biconvex spherical lens are cemented; and/or the presence of a gas in the gas,
the sixth biconvex spherical lens and the seventh biconcave spherical lens are connected in a gluing manner.
Optionally, the day and night confocal athermalization lens further includes a diaphragm located on the optical axis, and the diaphragm is disposed between the fifth biconvex spherical lens and the sixth biconvex spherical lens.
Optionally, a total focal length of the day-night confocal athermalization lens is f, a focal length of the first biconcave spherical lens is f1, a focal length of the second meniscus spherical lens is f2, a focal length of the third biconcave spherical lens is f3, a focal length of the fourth biconcave spherical lens is f4, a focal length of the fifth biconvex spherical lens is f5, a focal length of the sixth biconvex spherical lens is f6, a focal length of the seventh biconcave spherical lens is f7, and a focal length of the eighth meniscus spherical lens is f8; wherein the content of the first and second substances,
f1/f is more than 1 and less than 2; and/or the presence of a gas in the gas,
f2/f is more than 1 and less than 2; and/or the presence of a gas in the atmosphere,
-1 < f3/f < -0.3; and/or the presence of a gas in the gas,
-2 < f4/f < -1; and/or the presence of a gas in the gas,
f5/f is more than 0.3 and less than 1; and/or the presence of a gas in the gas,
f6/f is more than 0.3 and less than 1; and/or the presence of a gas in the gas,
-1 < f7/f < -0.1; and/or the presence of a gas in the atmosphere,
0.5＜f8/f＜1。
optionally, the total focal length of the day and night confocal athermalization lens is f, and the optical total length of the day and night confocal athermalization lens is TTL, wherein f/TTL is greater than 0.5 and less than 1.5.
Optionally, the first biconvex spherical lens has an abbe number Vd1, vd1 > 70; and/or the presence of a gas in the gas,
the dispersion coefficient of the second meniscus spherical lens is Vd2, and Vd2 is more than 70; and/or the presence of a gas in the gas,
the dispersion coefficient of the third biconcave spherical lens is Vd3, 35-Vd 3-50; and/or the presence of a gas in the gas,
the dispersion coefficient of the fourth biconcave spherical lens is Vd4, 30-Vd 4-50; and/or the presence of a gas in the gas,
the dispersion coefficient of the fifth biconvex spherical lens is Vd5, 50-Vd 5-60; and/or the presence of a gas in the gas,
the dispersion coefficient of the sixth biconvex spherical lens is Vd6, 25-Vd 6-50; and/or the presence of a gas in the atmosphere,
the dispersion coefficient of the seventh biconcave spherical lens is Vd7, 20-Vd 7-40; and/or the presence of a gas in the gas,
the dispersion coefficient of the eighth meniscus spherical lens is Vd8, 30<Vd8<50.
Optionally, the day and night confocal athermalization lens further includes an optical filter, a protective glass, and a photosensitive chip in sequence from the object side to the image side, where the optical filter, the protective glass, and the photosensitive chip are disposed on a side of the eighth meniscus spherical lens close to the image side.
The utility model provides an among the technical scheme, set gradually first biconvex spherical lens, second meniscus spherical lens, third biconcave spherical lens, fourth biconcave spherical lens, fifth biconvex spherical lens, sixth biconvex spherical lens, seventh biconcave spherical lens and eighth meniscus spherical lens from the object side to image side along the optical axis, the concave surface of second meniscus spherical lens and eighth meniscus spherical lens sets up towards image side through the heavy-calibre that first biconvex spherical lens has, can collect more optical information under the equal focus condition, reaches clear imaging's under the low light effect; the third biconcave spherical lens is a biconcave negative lens which can counteract spherical aberration, coma aberration, astigmatism, distortion and the like generated by the first biconvex spherical lens and the second meniscus spherical lens, and can reduce the deflection angle of light rays, so that the light rays of the system are smoother, and the assembly tolerance sensitivity of the lenses is reduced; the fourth biconcave spherical lens, the fifth biconvex spherical lens, the sixth biconvex spherical lens and the seventh biconcave spherical lens can effectively improve field curvature, chromatic aberration, high-level aberration, spherical aberration and coma aberration; the eighth meniscus spherical lens is a negative meniscus lens and is used for offsetting astigmatism and distortion generated by the front lens and controlling the angle of a chief ray of emergent light of the lens to adapt to the angle of the photosensitive chip so as to improve the light energy response efficiency, so that the day and night confocal athermalization lens has the advantages of low cost, large aperture and capability of realizing infrared and high-low temperature high-quality clear imaging without focusing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of an embodiment of a day and night confocal athermalization lens provided by the present invention;
fig. 2 is a visible MTF graph of the day-night confocal athermal lens in fig. 1;
FIG. 3 is a graph of the infrared MTF of the day-night confocal athermalized lens of FIG. 1;
FIG. 4 is a graph of MTF of the day and night confocal athermalized lens of FIG. 1 at low temperature-40 deg.C;
FIG. 5 is a graph of MTF at +80 ℃ for the day and night confocal athermal lens of FIG. 1;
FIG. 6 is a graph of field curvature distortion of the day and night confocal athermalization lens of FIG. 1;
fig. 7 is a graph of relative illumination of the day and night confocal athermalization lens in fig. 1.
The reference numbers indicate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Day and night confocal athermalization lens | 7 | Seventh biconcave spherical lens |
| 1 | First biconvex |
8 | Eighth meniscus |
| 2 | Second meniscus ballSurface lens | 9 | |
| 3 | Third biconcave |
10 | |
| 4 | Fourth biconcave |
11 | Cover glass |
| 5 | Fifth biconvex spherical lens | 12 | |
| 6 | Sixth biconvex spherical lens |
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
With the development of optical lens technology, the market has higher and higher requirements on high-definition athermalized and day and night dual-purpose lenses, and the demand of the vehicle-mounted security monitoring industry is higher and higher at present. However, the day and night dual-purpose lens in the current market has a plurality of defects: the infrared defocusing amount is large, and the imaging cannot be clear at the same time in the day and at night; the # F is large, the light flux of the lens is small, and the imaging effect is influenced; the relative illumination of the lens is low, and the uniformity of the imaging surface is poor.
In order to solve the above problem, the utility model provides a confocal no camera lens 100 of day night, fig. 1 is the utility model provides a confocal no camera lens 100 of day night's concrete embodiment, fig. 2 to fig. 7 are the utility model provides a confocal no camera lens 100 technical index's of day night schematic diagram of no camera lens 100.
Referring to fig. 1, the day and night confocal athermalization lens 100 includes a housing (not shown) and a refractive lens group mounted in an inner cavity of the housing, the refractive lens group forms an optical axis corresponding to the housing, the refractive lens group includes, in order from an object side to an image side, a first biconvex spherical lens 1, a second meniscus spherical lens 2, a third biconcave spherical lens 3, a fourth biconcave spherical lens 4, a fifth biconvex spherical lens 5, a sixth biconvex spherical lens 6, a seventh biconcave spherical lens 7 and an eighth meniscus spherical lens 8, concave surfaces of the second meniscus spherical lens 2 and the eighth meniscus spherical lens 8 face the image side.
The utility model provides an among the technical scheme, set gradually first biconvex spherical lens 1, second meniscus spherical lens 2, third biconcave spherical lens 3, fourth biconcave spherical lens 4, fifth biconvex spherical lens 5, sixth biconvex spherical lens 6, seventh biconcave spherical lens 7 and eighth meniscus spherical lens 8 from the object side to image side along the optical axis, the concave surface of second meniscus spherical lens 2 and eighth meniscus spherical lens 8 sets up towards image side through the heavy-calibre that first biconvex spherical lens 1 has, can collect more light information under the same focal length condition, reaches the clear effect of imaging under the low light; the third biconcave spherical lens 3 is a biconcave negative lens which can counteract spherical aberration, coma, astigmatism, distortion and the like generated by the first biconvex spherical lens 1 and the second meniscus spherical lens 2, and can reduce the deflection angle of light rays, so that the light rays of the system are smoother, and the sensitivity of the installation and adjustment tolerance of the lenses is reduced; the fourth biconcave spherical lens 4, the fifth biconvex spherical lens 5, the sixth biconvex spherical lens 6 and the seventh biconcave spherical lens 7 can effectively improve field curvature, chromatic aberration, high-level aberration, spherical aberration and coma aberration; the eighth meniscus spherical lens 8 is a meniscus negative lens and is used for offsetting astigmatism and distortion generated by the front lens and controlling the angle of a chief ray of emergent light of the lens to adapt to the angle of the photosensitive chip 12 so as to improve the luminous energy response efficiency. The day and night confocal athermalization lens 100 has the advantages of low cost, large aperture and capability of realizing infrared, high-low temperature, high-quality and clear imaging without focusing.
In this embodiment, the basic parameter table of the day and night confocal athermalized low-cost lens is shown in table 1, wherein the curvature radius and the thickness unit are both millimeters (mm).
TABLE 1
Specifically, in the prior art, as day and night confocal lenses of the same type and F/# are all 1.4,1.6 or even larger, the aperture of the lens is small, the light transmission amount is insufficient, particularly under dim light, the image plane becomes dark obviously, and the imaging effect is seriously influenced, in other embodiments, the focal power of the first biconvex spherical lens 1 is positive; and/or the optical power of the second meniscus spherical lens 2 is positive; and/or the optical power of the third biconcave spherical lens 3 is negative; and/or the optical power of the fourth biconcave spherical lens 4 is negative; and/or the focal power of the fifth biconvex spherical lens 5 is positive; and/or the focal power of the sixth biconvex spherical lens 6 is positive; and/or the optical power of the seventh biconcave spherical lens 7 is negative; and/or the optical power of the eighth meniscus spherical lens 8 is positive. In the most preferred embodiment, the first biconvex spherical lens 1 has a positive optical power; the focal power of the second meniscus spherical lens 2 is positive; the focal power of the third biconcave spherical lens 3 is negative; the focal power of the fourth biconcave spherical lens 4 is negative; the focal power of the fifth biconvex spherical lens 5 is positive; the focal power of the sixth biconvex spherical lens 6 is positive; the focal power of the seventh biconcave spherical lens 7 is negative; the power of the eighth meniscus spherical lens 8 is positive. The day and night confocal athermalization lens 100 is provided with a large aperture, the # F is less than or equal to 1.2, the light transmission amount is larger than that of other products, the # F is more than or equal to 1.4,1.6, and the imaging can be clearly carried out under the weak light; the relative illumination is more than 65%, and compared with 40% of that of the prior other products, the picture uniformity is high. The day and night confocal athermalization lens 100 can work in working bands with visible light wavelengths of 486-750 nm and near infrared wavelengths of 830-870 nm, and can work in both day and night.
Further, in order to achieve confocal performance and control cost of the day and night confocal lens of the same type in the prior art, a plastic aspheric surface is adopted, which results in poor reliability of the lens and is unable to adapt to a severe environment, and in order to enable the day and night confocal athermalization lens 100 to have better stability, in other embodiments, at least one of the first biconvex spherical lens 1, the second meniscus spherical lens 2, the third biconcave spherical lens 3, the fourth biconcave spherical lens 4, the fifth biconvex spherical lens 5, the sixth biconvex spherical lens 6, the seventh biconcave spherical lens 7, and the eighth meniscus spherical lens 8 is made of glass. Preferably, in this embodiment, the eight spherical lenses of the day and night confocal athermalization lens 100 are made of glass. Therefore, through reasonably distributing the focal power of the lens and considering the collocation of the thermal expansion coefficients of the glass materials, the lens can clearly image in the environment of-40 ℃ to 80 ℃, the high yield advantage of processing and assembling is ensured, and the cost is further reduced; meanwhile, the high reliability of the product is ensured, so that the product reaches the military standard. The graphs shown in fig. 2 to 5 are MTF graphs of visible light, near infrared, low temperature of-40 ℃ and high temperature of +80 ℃ in the scheme, and it can be seen from the graphs that the performance differences of various states are small, the consistency is good, the performance is good under the conditions of visible light, near infrared, low temperature of-40 ℃ and high temperature of +80 ℃, and clear imaging can be achieved without focusing.
Further, in this embodiment, the first biconvex spherical lens 1 and/or the second meniscus spherical lens 2 are made of low-refractive high-dispersion glass, and the low-refractive high-dispersion glass can effectively perform achromatic and secondary spectrum. The sixth biconvex spherical lens 6 and/or the seventh biconcave spherical lens 7 are made of high-refraction low-dispersion glass. Also, in the present embodiment, the fourth biconcave spherical lens 4 and the fifth biconvex spherical lens 5 are cemented, and the sixth biconvex spherical lens 6 and the seventh biconcave spherical lens 7 are cemented. The reasonable use of the cementing part, the proper distribution of focal power, the combination of the thermal parameters of the glass material, the good correction of aberration and the realization of the effect of high-low temperature athermalization, and the effective reduction of chromatic aberration makes it reach the effects of a visible light wave band and a near-infrared wave band imaging confocal plane and simultaneously clear, and meets the day and night sharing requirements.
Further, in order to improve the image quality, in this embodiment, the day and night confocal athermalization lens 100 further includes a stop 9 located on the optical axis, and the stop 9 is disposed between the fifth biconvex spherical lens 5 and the sixth biconvex spherical lens 6. This limits the on-axis beam aperture and helps to improve image quality.
Specifically, in order to enable the spherical lenses to cooperate with each other to achieve the desired effect, in this embodiment, the total focal length of the day-night confocal athermal lens 100 is f, and the focal length of the first biconvex spherical lens 1 is f1, where 1 < f1/f < 2; the focal length of the second meniscus spherical lens 2 is f2, and f2/f is more than 1 and less than 2; the focal length of the third biconcave spherical lens 3 is f3, -1 < f3/f < 0.3; the focal length of the fourth biconcave spherical lens 4 is f4, -2 < f4/f < -1; the focal length of the fifth biconvex spherical lens 5 is f5, and f5/f is more than 0.3 and less than 1; the focal length of the sixth biconvex spherical lens 6 is f6, and f6/f is more than 0.3 and less than 1; the focal length of the seventh biconcave spherical lens 7 is f7, -1 < f7/f < -0.1; the focal length of the eighth meniscus spherical lens 8 is f8, wherein f8/f is more than 0.5 and less than 1.
Specifically, in order to enable the day and night confocal athermalization lens 100 to be applicable to more scenes, in the embodiment, the total focal length of the day and night confocal athermalization lens 100 is f, and the optical total length of the day and night confocal athermalization lens 100 is TTL, where f/TTL is greater than 0.5 and less than 1.5. So set up, satisfy the miniaturized trend of camera lens, can satisfy for military use requirement, also can satisfy daily portable demand.
Further, in this embodiment, the first biconvex spherical lens 1 has an abbe number Vd1, vd1 > 70; and/or the second meniscus spherical lens 2 has an abbe number Vd2, vd2 > 70; and/or the third biconcave spherical lens 3 has an abbe number Vd3, 35-over Vd 3-over 50; and/or the fourth biconcave spherical lens 4 has an abbe number Vd4, 30-over Vd 4-over 50; and/or the fifth biconvex spherical lens 5 has an abbe number Vd5, 50-straw (over-all) Vd 5-straw (over-all) 60; and/or the dispersion coefficient of the sixth biconvex spherical lens 6 is Vd6, 25-straw (Vd 6) is restricted to 50; and/or the seventh biconcave spherical lens 7 has an abbe number Vd7, 20-over Vd 7-over 40; and/or the dispersion coefficient of the eighth meniscus spherical lens 8 is Vd8, 30 is constructed from the layers of Vd8 and 50. By the arrangement, the dispersion of the day and night confocal athermalization lens 100 is not obvious, and the imaging quality of the lens is good.
Further, in this embodiment, the day and night confocal athermalization lens 100 further includes an optical filter 10, a protection glass 11 and a photo chip 12 in sequence from the object side to the image side, wherein the optical filter 10, the protection glass 11 and the photo chip 12 are disposed on a side of the eighth meniscus spherical lens 8 close to the image side. With such a configuration, the optical filter 10 can effectively filter out parasitic light in a non-working band, so as to reduce optical noise and reduce difficulty for subsequent processing of the optoelectronic module.
In summary, the technical indexes of the optical system of the day and night confocal athermalization lens 100 are as follows: the effective focal length of the day-night confocal athermalization lens 100 is EFFL, wherein EFFL =31mm; the field angle of the day and night confocal athermal lens 100 is 2w, wherein 2w is larger than or equal to 16 degrees; the diameter of an imaging circle of the day and night confocal athermalization lens 100 is phi, wherein phi is larger than 9.2mm; the working spectral range of the day-night confocal athermalization lens 100 is as follows: 486-750nm and 830-870 nm; the optical total length of the day and night confocal athermalization lens 100 is TTL, wherein the TTL is less than or equal to 50mm; the optical back intercept of the day and night confocal athermalization lens 100 is BFL, wherein the BFL is more than or equal to 9mm; the F-Tan distortion of the day and night confocal athermalization lens 100 is less than or equal to 1.5%; the relative illumination of the day and night confocal athermalization lens 100 is more than or equal to 65 percent.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. The day and night confocal athermalization lens is characterized by comprising a shell and a refraction lens group arranged in an inner cavity of the shell, wherein the refraction lens group correspondingly forms an optical axis in the shell, the refraction lens group sequentially comprises a first biconvex spherical lens, a second meniscus spherical lens, a third biconcave spherical lens, a fourth biconcave spherical lens, a fifth biconvex spherical lens, a sixth biconvex spherical lens, a seventh biconcave spherical lens and an eighth meniscus spherical lens from an object side to an image side, and concave surfaces of the second meniscus spherical lens and the eighth meniscus spherical lens face the image side.
2. The confocal day-night athermalized lens of claim 1, wherein the first biconvex spherical lens power is positive; and/or the presence of a gas in the gas,
the focal power of the second meniscus spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the third biconcave spherical lens is negative; and/or the presence of a gas in the atmosphere,
the focal power of the fourth biconcave spherical lens is negative; and/or the presence of a gas in the gas,
the focal power of the fifth biconvex spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the sixth biconvex spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the seventh biconcave spherical lens is negative; and/or the presence of a gas in the gas,
and the focal power of the eighth meniscus spherical lens is positive.
3. The confocal day-night athermalization lens of claim 1, wherein at least one of the first biconcave spherical lens, the second meniscus spherical lens, the third biconcave spherical lens, the fourth biconcave spherical lens, the fifth biconvex spherical lens, the sixth biconvex spherical lens, the seventh biconcave spherical lens, and the eighth meniscus spherical lens is made of glass.
4. The confocal day-night athermalization lens of claim 3, wherein the first biconvex spherical lens and/or the second meniscus spherical lens are made of low-refractive high-dispersion glass; and/or the presence of a gas in the gas,
the sixth biconvex spherical lens and/or the seventh biconcave spherical lens are made of high-refraction low-dispersion glass.
5. The day-night confocal athermal lens of claim 1, wherein said fourth biconcave spherical lens and said fifth biconvex spherical lens are cemented; and/or the presence of a gas in the gas,
the sixth biconvex spherical lens and the seventh biconcave spherical lens are connected in a gluing manner.
6. The day-night confocal athermalizing lens according to claim 1, further comprising a stop on the optical axis, the stop being disposed between the fifth biconvex spherical lens and the sixth biconvex spherical lens.
7. The confocal day-night athermalization lens of claim 1, wherein the total focal length of the confocal day-night athermalization lens is f, the focal length of the first biconvex spherical lens is f1, the focal length of the second meniscus spherical lens is f2, the focal length of the third biconcave spherical lens is f3, the focal length of the fourth biconcave spherical lens is f4, the focal length of the fifth biconvex spherical lens is f5, the focal length of the sixth biconvex spherical lens is f6, the focal length of the seventh biconcave spherical lens is f7, and the focal length of the eighth meniscus spherical lens is f8; wherein, the first and the second end of the pipe are connected with each other,
f1/f is more than 1 and less than 2; and/or the presence of a gas in the gas,
f2/f is more than 1 and less than 2; and/or the presence of a gas in the gas,
-1 < f3/f < -0.3; and/or the presence of a gas in the gas,
-2 < f4/f < -1; and/or the presence of a gas in the gas,
f5/f is more than 0.3 and less than 1; and/or the presence of a gas in the gas,
f6/f is more than 0.3 and less than 1; and/or the presence of a gas in the atmosphere,
-1 < f7/f < -0.1; and/or the presence of a gas in the gas,
0.5＜f8/f＜1。
8. the day-night confocal athermalization lens of claim 1, wherein an overall focal length of the day-night confocal athermalization lens is f, and an optical overall length of the day-night confocal athermalization lens is TTL, wherein 0.5 < f/TTL < 1.5.
9. The confocal day-night athermalization lens of claim 1, wherein the first biconvex spherical lens has an abbe number Vd1, vd1 > 70; and/or the presence of a gas in the gas,
the dispersion coefficient of the second meniscus spherical lens is Vd2, and Vd2 is more than 70; and/or the presence of a gas in the atmosphere,
the dispersion coefficient of the third biconcave spherical lens is Vd3, 35-Vd 3-50; and/or the presence of a gas in the gas,
the dispersion coefficient of the fourth biconcave spherical lens is Vd4, 30-Vd 4-50; and/or the presence of a gas in the gas,
the dispersion coefficient of the fifth biconvex spherical lens is Vd5, 50-Vd 5-60; and/or the presence of a gas in the gas,
the dispersion coefficients of the sixth biconvex spherical lens are Vd6, 25 & lt 6 & gt Vd 50; and/or the presence of a gas in the gas,
the dispersion coefficient of the seventh biconcave spherical lens is Vd7, 20-Vd 7-40; and/or the presence of a gas in the gas,
the dispersion coefficient of the eighth meniscus spherical lens is Vd8, 30<Vd8<50.
10. The confocal day-night athermalization lens of claim 1, further comprising an optical filter, a protection glass, and a photo chip disposed on a side of the eighth meniscus spherical lens close to the image side, in order from the object side to the image side.
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| CN202221513896.XU CN217561814U (en) | 2022-06-15 | 2022-06-15 | Day and night confocal athermalization lens |
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| CN202221513896.XU CN217561814U (en) | 2022-06-15 | 2022-06-15 | Day and night confocal athermalization lens |
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