CN214335347U - Short-focus vehicle-mounted rearview mirror head - Google Patents
Short-focus vehicle-mounted rearview mirror head Download PDFInfo
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- CN214335347U CN214335347U CN202120721710.9U CN202120721710U CN214335347U CN 214335347 U CN214335347 U CN 214335347U CN 202120721710 U CN202120721710 U CN 202120721710U CN 214335347 U CN214335347 U CN 214335347U
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Abstract
The utility model discloses a short-focus vehicle-mounted rearview mirror head, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively provided with an object side surface and an image side surface; the first lens has negative refractive index; the second lens has negative refractive index; the third lens element has positive refractive index; the fourth lens element has positive refractive index; the fifth lens element has positive refractive index; the sixth lens element has negative refractive index; the seventh lens element has positive refractive index; the optical imaging lens only has the seven lenses with the refractive index. The utility model has high-definition imaging effect and clear and uniform imaging picture; the blue-violet side color difference does not occur on the picture, and the image color reducibility is good; strictly controlling wide-angle distortion and ensuring the image imaging quality; when the LED lamp is used in a low-light driving environment at night, the LED lamp also has good picture brightness.
Description
Technical Field
The utility model relates to a camera lens technical field, concretely relates to short burnt vehicle-mounted rearview mirror head.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, the optical imaging lens is also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring and the like, so that the requirement on the optical imaging lens is higher and higher. However, the existing vehicle-mounted rearview mirror has at least the following defects:
1. the existing vehicle-mounted rearview mirror head generally has the defects of low lens pixel, insufficient resolution, fuzzy imaging picture and more noise points.
2. The prior vehicle-mounted rearview mirror head has a poor visual angle FOV and is difficult to cover the rear part of a vehicle body.
3. The existing vehicle-mounted rearview mirror head has the defects that the light passing is generally not large due to the wide-angle design requirement, and the relative illumination of the edge of a picture is low.
4. The existing vehicle-mounted rearview mirror head is difficult to meet the requirement of vehicle-mounted reliability and has short service life.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a short burnt vehicle-mounted rear-view camera lens to solve the one of above-mentioned problem at least.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a short-focus vehicle-mounted rearview mirror comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a sixth lens, a seventh lens, a sixth lens, a seventh lens, a sixth lens, a seventh, a sixth lens, a seventh, a sixth; the first lens element to the seventh lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a concave/convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the optical imaging lens only has the seven lenses with the refractive index.
Preferably, the following conditional expressions are satisfied between the focal lengths of the first to seventh lenses and the focal length of the entire lens:
-3＜(f1/f)＜-2， -3＜(f2/f)＜-2， 6＜(f3/f)＜9，
2＜(f4/f)＜3.5， 1＜(f5/f)＜2， -2＜(f6/f)＜-1，
3＜(f7/f)＜4.5，
wherein f, f1, f2, f3, f4, f5, f6 and f7 are focal lengths of the whole lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, respectively.
Preferably, the first lens is made of H-ZLAF4LA material, and the center thickness of the lens is larger than 1.5 mm.
Preferably, the first lens, the second lens, the third lens and the fourth lens are all glass spherical lenses, and the image side surface of the fifth lens and the object side surface of the sixth lens are mutually cemented.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.
Preferably, the following conditional formula is satisfied: vd5 is more than or equal to 68, and Vd7 is more than or equal to 63, wherein Vd5 is the abbe number of the fifth lens, and Vd7 is the abbe number of the seventh lens.
Preferably, the fifth lens and the seventh lens are made of optical glass with negative temperature coefficient of refractive index dn/dt.
After the technical scheme is adopted, compared with the background art, the utility model, have following advantage:
1. the utility model discloses a 130 ten thousand pixel designs have the imaging effect of high definition, and the image picture is clear even.
2. The utility model discloses a 425nm-675nm visible width spectral design, the control of on-axis focal shift is within 22um, and later color control is within 5um, ensures that blue purple limit colour difference can not appear in the picture, and image color reducibility is good.
3. The utility model discloses strict management and control wide angle distortion, optics F-Theta distortion control are within-4%, guarantee picture imaging quality.
4. The utility model discloses logical light F2.8, formation of image marginal illuminance is greater than 60%, when guaranteeing to use in the low light driving environment at night, also can possess fine picture luminance.
5. The utility model discloses a new optical structure, first piece lens use high rigidity glass sphere to design promptly, considers the reliance requirement of car rule promptly when optics design, the long service life of camera lens.
Drawings
FIG. 1 is a light path diagram according to the first embodiment;
FIG. 2 is a graph of MTF under visible light for a lens according to a first embodiment;
FIG. 3 is a defocus graph of the lens in the first embodiment under visible light;
FIG. 4 is a graph of vertical chromatic aberration under visible light for a lens according to an embodiment;
FIG. 5 is a graph of axial chromatic aberration under visible light for a lens according to an embodiment;
FIG. 6 is a graph of field curvature and distortion under visible light for a lens according to an embodiment;
FIG. 7 is a graph of relative illumination of a lens under visible light according to one embodiment;
FIG. 8 is a light path diagram of the second embodiment;
FIG. 9 is a graph of the MTF under visible light for the lens of the second embodiment;
FIG. 10 is a defocus graph of the lens in the second embodiment under visible light;
FIG. 11 is a graph of vertical chromatic aberration under visible light for the lens of the second embodiment;
FIG. 12 is a graph showing the axial chromatic aberration of the lens in the second embodiment in visible light;
FIG. 13 is a graph of field curvature and distortion under visible light for a lens barrel according to the second embodiment;
FIG. 14 is a graph of relative illumination under visible light for a lens according to a second embodiment;
FIG. 15 is a light path diagram of the third embodiment;
fig. 16 is a graph of MTF under visible light for a lens in the third embodiment;
FIG. 17 is a defocus graph of the lens in the third embodiment under visible light;
FIG. 18 is a graph of vertical axis chromatic aberration under visible light for the lens of the third embodiment;
FIG. 19 is a graph showing the axial chromatic aberration of the lens in the third embodiment in visible light;
FIG. 20 is a graph of field curvature and distortion under visible light for a lens barrel according to a third embodiment;
FIG. 21 is a graph of relative illuminance under visible light for a lens of the third embodiment;
FIG. 22 is a light path diagram of the fourth embodiment;
fig. 23 is a graph of MTF in visible light of the lens in the fourth embodiment;
FIG. 24 is a defocus graph of the lens in the fourth embodiment in visible light;
FIG. 25 is a graph of vertical axis chromatic aberration under visible light for the lens of the fourth embodiment;
FIG. 26 is a graph showing the axial chromatic aberration of the lens of the fourth embodiment in visible light;
FIG. 27 is a graph of field curvature and distortion under visible light for a lens barrel according to a fourth embodiment;
fig. 28 is a graph of relative illuminance under visible light for the lens of the fourth embodiment.
Description of reference numerals:
the lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a diaphragm 8 and a protective glass 9.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The utility model discloses a short-focus vehicle-mounted rearview mirror head, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a concave/convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the optical imaging lens only has the seven lenses with the refractive index.
Preferably, the following conditional expressions are satisfied between the focal lengths of the first to seventh lenses and the focal length of the entire lens:
-3＜(f1/f)＜-2， -3＜(f2/f)＜-2， 6＜(f3/f)＜9，
2＜(f4/f)＜3.5， 1＜(f5/f)＜2， -2＜(f6/f)＜-1，
3＜(f7/f)＜4.5，
wherein f, f1, f2, f3, f4, f5, f6 and f7 are focal lengths of the whole lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, respectively.
Preferably, the first lens is made of a high-hardness H-ZLAF4LA environment-friendly material, the center thickness of the lens is larger than 1.5mm, and the lens is plated with a waterproof scratch-resistant film to meet requirements of vehicle-specified ball drop experiments, scratch-resistant experiments and the like.
Preferably, the first lens, the second lens, the third lens and the fourth lens are all glass spherical lenses, and the image side surface of the fifth lens and the object side surface of the sixth lens are mutually cemented.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.
Preferably, the following conditional formula is satisfied: vd5 is more than or equal to 68, and Vd7 is more than or equal to 63, wherein Vd5 is the abbe number of the fifth lens, and Vd7 is the abbe number of the seventh lens.
Preferably, the fifth lens and the seventh lens are made of optical glass with negative temperature coefficient of refractive index dn/dt.
Two kinds of optical glass with high Abbe number and negative temperature coefficient of refractive index are respectively arranged on the fifth and seventh lens positions, which not only can correct the chromatic aberration of the lens, but also can offset the influence of temperature change on the back focal offset of the lens, so as to ensure that the image is still clear and not out of focus when the lens is used in the temperature range of-40 ℃ to 105 ℃, and can meet the requirements of the service environment of the vehicle gauge.
The following describes the vehicle-mounted rearview mirror in detail with reference to specific embodiments.
Example one
Referring to fig. 1, the present embodiment discloses a short-focus vehicle-mounted rearview mirror, which sequentially includes a first lens 1 to a seventh lens 7 along an optical axis from an object side a1 to an image side a 2; the first lens element 1 to the seventh lens element 7 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are concave;
the third lens element 3 has a positive refractive index, and the object-side surface and the image-side surface of the third lens element 3 are concave and convex respectively;
the fourth lens element 4 has a positive refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are convex and concave/convex;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a negative refractive index, and the sixth lens element 6 has a concave object-side surface and a convex image-side surface;
the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a convex object-side surface and a convex image-side surface;
the optical imaging lens has only the seven lenses with the refractive index, the first lens 1 to the seventh lens 7 are all glass spherical lenses, and the image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are mutually glued. In this embodiment, the diaphragm 8 is disposed between the fourth lens 4 and the fifth lens 5, but the diaphragm 8 may be disposed at other suitable positions in other embodiments.
Detailed optical data of this embodiment are shown in table 1.
Table 1 detailed optical data of example one
| Surface of | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | |
||
| 0 | Shot object | Infinity | Infinity | ||||||
| 1 | First lens | 12.830 | 10.938 | 1.574 | H-ZLAF4LA | 1.910826 | 35.2557 | -6.35 | |
| 2 | 6.720 | 3.538 | 2.963 | ||||||
| 3 | Second lens | 6.713 | -10.909 | 0.828 | H-ZK3 | 1.589128 | 61.2476 | -5.98 | |
| 4 | 5.527 | 5.383 | 0.932 | ||||||
| 5 | Third lens | 5.526 | -24.200 | 3.234 | H-ZLAF55D | 1.834810 | 42.7275 | 17.91 | |
| 6 | 5.647 | -9.840 | 0.101 | ||||||
| 7 | Fourth lens | 5.125 | 5.291 | 1.356 | H-ZLAF50E | 1.804009 | 46.5677 | 6.86 | |
| 8 | 4.610 | 104.137 | 1.774 | ||||||
| 9 | Diaphragm surface | 2.167 | Infinity | 1.182 | |||||
| 10 | Fifth lens element | 2.958 | 23.621 | 1.689 | H-ZPK5 | 1.592800 | 68.3459 | 3.21 | |
| 11 | Sixth lens element | 3.404 | -2.019 | 0.859 | H-ZF50 | 1.740773 | 27.7617 | -3.66 | |
| 12 | 4.605 | -9.161 | 0.675 | ||||||
| 13 | Seventh lens element | 6.212 | 8.574 | 1.559 | H-ZPK1A | 1.617998 | 63.4058 | 10.08 | |
| 14 | 6.379 | -21.451 | 1.100 | ||||||
| 15 | Cover glass | 6.619 | Infinity | 0.800 | H-K9L | 1.516797 | 64.2124 | |
|
| 16 | 6.712 | Infinity | 1.882 | ||||||
| 17 | Image plane | 7.050 | Infinity |
In this embodiment, the focal length f of the optical imaging lens is 2.58177 mm; the DFOV is about 162 degrees, the TTL is less than 27.6mm, the light transmission is about F/2.8, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 1 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 2, it can be seen that when the spatial frequency of the lens reaches 100lp/mm, the full-field transfer function image is still greater than 30%, the center-to-edge uniformity is high, the imaging quality is good, and the resolution of the lens is high. Referring to fig. 3, it can be seen that the defocus amount of the lens under visible light is small. Please refer to fig. 4, which shows that the later color is smaller than 4um in the visible wide spectral band of 425 and 675nm, which ensures that the image has no blue-violet color difference and higher image color reducibility. Referring to fig. 5, it can be seen that focal shift is < 16um, and the chromatic aberration is small. Referring to fig. 6, it can be seen that the optical distortion is controlled within-4%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by a later-stage image algorithm, and the application is convenient. Referring to fig. 7, it can be seen that the relative illuminance is greater than 60%, which ensures uniform relative illuminance under high-light conditions, and can ensure sufficient image brightness even at night or in low-light driving environments.
Example two
As shown in fig. 8 to 14, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 2.
Table 2 detailed optical data of example two
In this embodiment, the focal length f of the optical imaging lens is 2.59365 mm; the DFOV is about 162 degrees, the TTL is less than 27.6mm, the light transmission is about F/2.8, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 8 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 9, which shows that when the spatial frequency of the lens reaches 100lp/mm, the full-field transfer function image is still larger than 30%, the center-to-edge uniformity is high, the imaging quality is good, and the resolution of the lens is high. Referring to fig. 10, the defocus graph of visible light shows that the defocus amount of the lens under visible light is small. Please refer to fig. 11, which shows that the later color is less than 5um in the visible wide spectral band of 425 and 675nm, so as to ensure that the image has no blue-violet color difference and high image color reducibility. Referring to fig. 12, it can be seen that focal shift is less than 12um, and the chromatic aberration is small. Referring to fig. 13, it can be seen that the optical distortion is controlled within-4%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by a later-stage image algorithm, and the application is convenient. Referring to fig. 14, it can be seen that the relative illuminance is greater than 60%, which ensures uniform relative illuminance under high-light conditions, and can ensure sufficient image brightness even at night or in low-light driving environments.
EXAMPLE III
As shown in fig. 15 to 21, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 3.
Table 3 detailed optical data of example three
In this embodiment, the focal length f of the optical imaging lens is 2.59365 mm; the DFOV is about 162 degrees, the TTL is less than 27.6mm, the light transmission is about F/2.8, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 15 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 16, which shows that when the spatial frequency of the lens reaches 100lp/mm, the full-field transfer function image is still larger than 30%, the center-to-edge uniformity is high, the imaging quality is good, and the resolution of the lens is high. Referring to fig. 17, it can be seen that the defocus amount of the lens under visible light is small. Please refer to fig. 18, which shows that the later color is less than 5um in the visible wide spectral band of 425 and 675nm, which ensures that the image has no blue-violet color difference and high image color reducibility. Referring to fig. 19, it can be seen that focal shift is < 16um, and chromatic aberration is small. Referring to fig. 20, it can be seen that the optical distortion is controlled within-4%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by a later-stage image algorithm, and the application is convenient. Referring to fig. 21, it can be seen that the relative illuminance is greater than 65%, which ensures uniform relative illuminance under high-light conditions, and can ensure sufficient image brightness even at night or in low-light driving environments.
Example four
As shown in fig. 22 to 28, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 4.
Table 4 detailed optical data for example four
In this embodiment, the focal length f of the optical imaging lens is 2.58475 mm; the DFOV is about 162 degrees, the TTL is less than 27.6mm, the light transmission is about F/2.8, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 22 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 23, which shows that when the spatial frequency of the lens reaches 100lp/mm, the full-field transfer function image is still larger than 30%, the center-to-edge uniformity is high, the imaging quality is good, and the resolution of the lens is high. Referring to fig. 24, it can be seen that the defocus amount of the lens under visible light is small. Please refer to fig. 25, which shows that the later color is smaller than 4um in the visible wide spectral band of 425 and 675nm, which ensures that the image has no blue-violet color difference and higher image color reducibility. Referring to fig. 26, it can be seen that focal shift is < 16um, and chromatic aberration is small. Referring to fig. 27, it can be seen that the optical distortion is controlled within-4%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by a later-stage image algorithm, and the application is convenient. Referring to fig. 28, it can be seen that the relative illuminance is greater than 70%, which ensures uniform relative illuminance under high-light conditions, and can ensure sufficient image brightness even at night or in low-light driving environments.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A short-focus vehicle-mounted rearview mirror is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a sixth lens in sequence from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a concave/convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the optical imaging lens only has the seven lenses with the refractive index.
2. A short-focus vehicle-mounted rearview mirror head as claimed in claim 1, wherein the focal lengths of said first through seventh lenses and the focal length of the entire lens satisfy the following conditions:
-3＜(f1/f)＜-2，-3＜(f2/f)＜-2，6＜(f3/f)＜9，
2＜(f4/f)＜3.5，1＜(f5/f)＜2，-2＜(f6/f)＜-1，
3＜(f7/f)＜4.5，
wherein f, f1, f2, f3, f4, f5, f6 and f7 are focal lengths of the whole lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, respectively.
3. The short-focus vehicle-mounted rearview mirror head of claim 1, wherein said first lens is made of H-ZLAF4LA material, and the center thickness of the lens is greater than 1.5 mm.
4. The short-focus vehicular rearview mirror head of claim 1, wherein said first through seventh lenses are all glass spherical lenses, and an image side surface of said fifth lens is cemented with an object side surface of said sixth lens.
5. The short-focus vehicle-mounted rearview mirror head of claim 1, further comprising an optical stop, wherein said optical stop is disposed between said fourth lens and said fifth lens.
6. A short focus vehicle rearview mirror head as claimed in claim 1, wherein the following condition is satisfied: vd5 is more than or equal to 68, and Vd7 is more than or equal to 63, wherein Vd5 is the abbe number of the fifth lens, and Vd7 is the abbe number of the seventh lens.
7. The short-focus vehicular rearview mirror head of claim 1 wherein said fifth lens and said seventh lens are made of optical glass having a negative temperature coefficient of refraction dn/dt.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047587A (en) * | 2022-04-19 | 2022-09-13 | 江西特莱斯光学有限公司 | Miniaturized camera system of thermal drift stabilization law enforcement instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047587A (en) * | 2022-04-19 | 2022-09-13 | 江西特莱斯光学有限公司 | Miniaturized camera system of thermal drift stabilization law enforcement instrument |
| CN115047587B (en) * | 2022-04-19 | 2024-05-10 | 江西特莱斯光学有限公司 | Miniaturized thermal drift stabilized law enforcement appearance camera system |
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