CN219871931U - 6mm day and night high-definition glass-plastic mixed prime lens - Google Patents
6mm day and night high-definition glass-plastic mixed prime lens Download PDFInfo
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- CN219871931U CN219871931U CN202123451224.9U CN202123451224U CN219871931U CN 219871931 U CN219871931 U CN 219871931U CN 202123451224 U CN202123451224 U CN 202123451224U CN 219871931 U CN219871931 U CN 219871931U
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- 229920003023 plastic Polymers 0.000 title claims abstract description 25
- 239000004033 plastic Substances 0.000 title claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 239000011521 glass Substances 0.000 claims abstract description 10
- 239000006059 cover glass Substances 0.000 claims description 2
- 230000004075 alteration Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000012634 optical imaging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010226 confocal imaging Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model relates to the field of optical imaging, and discloses a 6mm day and night high-definition glass-plastic mixed fixed focus lens, which comprises a lens, wherein the surface of the lens adjacent to one side of an object plane is defined as an object side surface, the surface of the lens adjacent to one side of an image plane is defined as an image side surface, and the lens sequentially comprises, from the object side to the image side along an optical axis of the lens: the first lens, the second lens, the third lens and the fourth lens are mixed and combined by adopting 1 piece of spherical glass and 3 pieces of aspheric plastic, so that high and low temperature drift of the system can be well corrected, the first lens to the fourth lens are respectively negative focal power, positive focal power and negative focal power, the distribution combination of different materials and focal power lenses is adopted, aberration of the system is well corrected, optical performance is good, the shape and the thickness ratio of each lens are normal, the structure is simple, the manufacturing performance is guaranteed, each lens is insensitive, and the lens is simple and easy to manufacture.
Description
Technical Field
The utility model relates to the field of optical imaging, in particular to a 6mm day and night high-definition glass-plastic mixed fixed focus lens.
Background
In recent years, for different purposes or environments, a plurality of series of products are already proposed by the monitoring lens, wherein a 6mm day-night high-definition glass-plastic mixed fixed focus lens is one of main stream products of fixed focus lenses, but the requirements of people on the fixed focus lens are higher and higher, and the overall trend is toward high performance and low cost. Such lenses in the current market also have problems of poor image quality and high cost, for example, poor image quality in severe weather, difficult confocal imaging in daytime and at night, and how to improve the performance of the lenses and reduce the production cost is a problem to be solved urgently.
Disclosure of Invention
The present utility model aims to overcome the above-mentioned disadvantages and to provide a technical solution for solving the above-mentioned problems.
The utility model provides a dual-purpose high definition glass of 6mm day night is moulded and is mixed fixed focus camera lens, its characterized in that includes the lens, and the surface that defines lens adjacent object plane one side is the object side, and the surface that the lens adjacent image plane one side is the image side, the lens includes from object side to image side in proper order along the camera lens optical axis: the first lens (1) is an aspheric plastic lens with negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the second lens (2) is a spherical glass lens with positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens (3) is an aspheric plastic lens with positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens (4) is an aspheric plastic lens with negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; an aperture diaphragm (8) is arranged between the first lens (1) and the second lens (2), and the rear part of the fourth lens (4) is also provided with: the optical filter (5), the optical filter (5) is made of H-K9L; a cover glass (6) integrated on a sensor (image sensor); an image acquisition element (7); the ratio of the focal length of each lens to the total focal length of the system of the lens meets the following conditions:
0.76≤|f1/f|≤1.70；
0.97≤|f2/f|≤3.07；
0.56≤|f3/f|≤0.90；
0.70≤|f4/f|≤1.74；
in the relational expression, "f" is the focal length of the lens optical system, "f1" is the focal length of the first lens (1), "f2" is the focal length of the second lens (2), "f3" is the focal length of the third lens (3), and "f4" is the focal length of the fourth lens (4).
As one of the improvements of the above-mentioned technical means, the focal length, refractive index and radius of curvature of the first lens (1) to the fourth lens (4) satisfy the following conditions, respectively:
| f1 | -10.77～-4.67 | ND1 | 1.52～1.56 | R11 | -9.55～-4.54 | R12 | +6.43～+15.95 |
| f2 | +5.74～+19.13 | ND2 | 1.53～1.77 | R21 | +6.76～+22.98 | R22 | -2011.09～-6.90 |
| f3 | +3.28～+5.70 | ND3 | 1.52～1.56 | R31 | +4.77～+11.28 | R32 | -4.59～-2.36 |
| f4 | -10.53～-4.06 | ND4 | 1.60～1.66 | R41 | -2.53～-1.53 | R42 | -6.73～-3.86 |
in the above table, "f1" is the focal length of the first lens (1), "ND1" is the refractive index of the first lens (1), "R11, R12" is the front-rear surface radius of curvature of the first lens (1), "f2" is the focal length of the second lens (2), "ND2" is the refractive index of the second lens (2), "R21, R22" is the front-rear surface radius of curvature of the second lens (2), "f3" is the focal length of the third lens (3), "ND3" is the refractive index of the third lens (3), "R31, R32" is the front-rear surface radius of curvature of the third lens (3), "f4" is the focal length of the fourth lens (4), "ND4" is the front-rear surface radius of curvature of the fourth lens (4), "-" indicates the negative direction, and so on.
As one of the improvements of the technical scheme, the IC/TTL is more than or equal to 0.29; OBFL/TTL is more than or equal to 0.31 and less than or equal to 0.44; in the relation, the focal length of the lens optical system is f; the total length of the lens optical system is TTL; the optical back intercept of the lens system is OBFL, namely the distance from the nearest point of the image side surface of the fourth lens (4) to the image surface; the holographic height of the 1/2.7 inch chip matched with the lens system is IC.
As one of the improvements of the technical scheme, the aperture of the lens optical system is F#, F# -2.40 is satisfied, the total length of the lens optical system is TTL, and TTL is satisfied to be less than or equal to 22.50mm.
As one of the improvements of the above technical solutions, the aspherical surfaces of the first lens (1), the third lens (3) and the fourth lens (4) may be defined by the following even aspherical equations:
where k is conic coefficient of quadric, r is lens height, c is lens curvature, and A-G is 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th order polynomial coefficients of aspheric surface.
As one of the improvements of the technical scheme, the maximum interval between the third lens (3) and the fourth lens (4) on the central axis is not more than 0.38mm.
Compared with the prior art, the utility model has the beneficial effects that: the 6mm day and night high-definition glass-plastic mixed fixed focus lens adopts the mixed combination of 1 spherical glass and 3 aspheric plastics, so that the high-low temperature drift of the system can be well corrected, the first lens to the fourth lens are respectively negative focal power, positive focal power and negative focal power, the distribution combination of different materials and the focal power lenses is well corrected, the optical performance is good, the shape and the thickness ratio of each lens are normal, the structure is simple, the manufacturing performance is ensured, each lens is insensitive, the lens surface type is simple and easy to manufacture, the processing cost is lower than that of the lens on the market, the cost performance is higher, the characteristics of good performance and low cost can be realized, and the utility model can be matched with 5MP, 1/2.7 inch chips through reasonable lens material selection, focal power distribution and optical design optimization, so as to realize 24-hour all-weather high-definition monitoring.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic view of an optical structure according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an optical path structure according to an embodiment of the present utility model;
FIG. 3 is a diagram of a field curvature of 0.546um visible light in an embodiment of the present utility model;
FIG. 4 is a graph showing the distortion of 0.546um of visible light according to the embodiment of the present utility model;
FIG. 5 is a schematic diagram of a Laterminal Color according to an embodiment of the present utility model.
In fig. 1: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a light filter; 6. a protective glass; 7. an image acquisition element; 8. an aperture stop.
Detailed Description
The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-5, in an embodiment of the present utility model, a 6mm day-night high definition glass-plastic mixed fixed focus lens includes a lens, a surface of the lens adjacent to an object plane is defined as an object side, a surface of the lens adjacent to an image plane is defined as an image side, and referring to fig. 1, the lens sequentially includes, from the object side to the image side along an optical axis of the lens: a first aspheric plastic lens (1) with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface; a second spherical glass lens (2) with positive focal power, the object side surface of which is a convex surface and the image side surface of which is a convex surface; a third aspherical plastic lens (3) having positive optical power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a fourth aspherical plastic lens (4) having negative optical power, the object side surface of which is concave, and the image side surface of which is convex; an aperture stop (8) is arranged between the first lens (1) and the second lens (2). The utility model only uses four lenses, has less lens data and compact structure, and ensures the small volume and light weight of the lens.
In order to make the optical system exhibit better performance, during the design process, the lens materials are reasonably selected, the focal lengths of the lenses are reasonably distributed, and the optical system is reasonably optimized to correct the aberration of the system, so that the performance of the optical system is finally optimized. Referring to fig. 1, in the embodiment of the present utility model, the focal length of the first lens (1) is f1, the focal length of the second lens (2) is f2, the focal length of the third lens (3) is f3, the focal length of the fourth lens (4) is f4, the focal lengths of the first lens (1) and the second lens (2) are f12, the focal length of the entire lens is f, and the ratio of the total focal length of each lens to the system satisfies the following conditions:
0.76≤|f1/f|≤1.70；
0.97≤|f2/f|≤3.07；
0.56≤|f3/f|≤0.90；
0.70≤|f4/f|≤1.74；
in an optical system, the focal length distribution of each lens is important, which determines the overall performance of the optical system, and the utility model controls the ratio of the focal length of each lens to the focal length f of the optical system so as to ensure the optimal performance of day-night confocal and high-low temperature performance of the system.
The angle of view of the lens is greater than 66 degrees, so that the first lens adopts a lens with a convex surface facing to an object space and with negative focal power, the lens has the function of rapidly converging light, abbe numbers of the first lens (1), the second lens (2) and the third lens (3) are greater than 49, abbe numbers of the fourth lens (4) are less than 24, the chromatic aberration of the system can be reduced by the collocation, and the problems of aberration of an optical system, balance temperature drift, day-night confocal and the like are considered, and the focal length, materials and R values of the lenses respectively meet the following conditions:
| f1 | -10.77～-4.67 | ND1 | 1.52～1.56 | R11 | -9.55～-4.54 | R12 | +6.43～+15.95 |
| f2 | +5.74～+19.13 | ND2 | 1.53～1.77 | R21 | +6.76～+22.98 | R22 | -2011.09～-6.90 |
| f3 | +3.28～+5.70 | ND3 | 1.52～1.56 | R31 | +4.77～+11.28 | R32 | -4.59～-2.36 |
| f4 | -10.53～-4.06 | ND4 | 1.60～1.66 | R41 | -2.53～-1.53 | R42 | -6.73～-3.86 |
in the above table, "f1" is the focal length of the first lens (1), "ND1" is the refractive index of the first lens (1), "R11, R12" is the front-rear surface radius of curvature of the first lens (1), "f2" is the focal length of the second lens (2), "ND2" is the refractive index of the second lens (2), "R21, R22" is the front-rear surface radius of curvature of the second lens (2), "f3" is the focal length of the third lens (3), "ND3" is the refractive index of the third lens (3), "R31, R32" is the front-rear surface radius of curvature of the third lens (3), "f4" is the focal length of the fourth lens (4), "ND4" is the front-rear surface radius of curvature of the fourth lens (4), "-" indicates the negative direction, and so on.
The focal length of the whole optical system is f, the total optical length of the lens system is TTL, the optical back intercept of the lens system is OBFL, namely, the distance from the nearest point of the image side surface of the fourth lens (4) to the image surface is equal to the total image height of 1/2.7' chips matched with the lens system is IC, and the following relations are satisfied:
IC/TTL≥0.29；
0.31≤OBFL/TTL≤0.44；
the aperture of the embodiment of the utility model is F#, which is 1.90-2.40, the total optical length of the lens system is TTL, which is 22.50mm or less, and the total length of the system is small, so that the small volume is ensured.
According to the embodiment of the utility model, the third lens (3) and the fourth lens (4) are relatively close, the maximum interval on the central axis is less than or equal to 0.38mm, and the sensitivity of the optical lens is reduced, the optical analysis capability is improved, and the third lens (3) and the fourth lens (4) are relatively close, so that the lens performance is improved.
Referring to fig. 1 and fig. 2, which are an optical structure schematic diagram and an optical path structure schematic diagram of a first embodiment of the present utility model, the second lens (2) is a glass sphere, the first lens (1), the third lens (3) and the fourth lens (4) are plastic aspheres, the total focal length of the system is 6.0mm, the aperture value is 2.0, and the distortion of the lens is less than 15%, so that the difference between a shooting image plane and a real object is small, and fig. 5 is a laser color of the system, the chromatic aberration of the system is well corrected, and the imaging quality of the system is guaranteed.
In the following table one, an optical Surface Number (Surface Number), a radius of curvature R (unit: mm) of each lens, a center thickness d (unit: mm) of each lens, a refractive index (ND) and abbe constant (VD) of each lens, and an aspherical K value (Conic) of each lens are listed in order from the object side to the image side, respectively.
List one
In table one, the surface numbers are numbered according to the surface order of the respective lenses, wherein "1" represents the front surface of the first lens (1), and "2" represents the rear surface of the first lens (1), and so on; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface curved to the image plane side, a negative value represents the surface curved to the object plane side, where "Infinity" represents the surface as a plane; the thickness represents the center axial distance from the current surface to the next surface, the refractive index represents the deflection capability of the current lens material to light, and the Abbe number represents the dispersion characteristic of the current lens material to light; the K value represents the magnitude of the best fit conic coefficient for the aspheric surface.
The aspherical surfaces of the first lens (1), the third lens (3) and the fourth lens (4) according to the first embodiment of the present utility model may be defined by the following even aspherical equations:
wherein k is conic coefficient of quadric, r is lens height, c is lens curvature, A-G is 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order coefficients of aspheric polynomial, in general, the aspheric lens is easier to correct aberration of the system, and the utility model adopts three aspheric lenses, so that aberration of the system is better corrected.
The following two lists the coefficients of the aspherical surfaces of the optical surfaces:
watch II
| Face number | A | B | C | D | E |
| 1 | 2.83E-04 | -1.62E-04 | 1.56E-05 | -5.50E-07 | 0.00E+00 |
| 2 | 4.16E-03 | -6.72E-04 | 4.05E-05 | -3.93E-08 | -2.34E-07 |
| 6 | 2.33E-04 | -5.60E-05 | 3.92E-06 | -5.66E-07 | -1.53E-08 |
| 7 | -8.13E-03 | 2.12E-03 | -2.16E-04 | -3.39E-07 | 1.01E-06 |
| 8 | -4.03E-04 | 1.53E-03 | -2.50E-04 | 1.06E-05 | 4.55E-07 |
| 9 | 1.17E-03 | 2.00E-03 | -4.10E-04 | 4.16E-05 | -1.67E-06 |
To sum up: the 6mm day and night dual-purpose high-definition glass-plastic mixed fixed focus lens adopts the mixed combination of 1 spherical glass and 3 aspheric plastics, the aberration of the system is well corrected, the optical performance is good, under the same quality in the industry, each lens is insensitive, the lens surface is simple and easy to manufacture, the processing cost is relatively low compared with that of the lens on the market, the lens has the characteristics of high cost performance, good realization performance and low cost, the problems of aberration, balanced temperature drift, day and night confocal and the like of an optical system are comprehensively considered, through reasonable lens material selection, optical power distribution and optical design optimization, the chips with the thickness of 5MP and 1/2.7 inch can be matched, the 24-hour all-day high-definition monitoring is realized, the day and night imaging confocal is met, the lens is ensured to be clearly shot at night, the consistency of the image quality under different conditions is realized, for example, the high temperature of +80 ℃ and the low temperature of-40 ℃ real shot images can be realized, and the resolution can reach five megapixels.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. The utility model provides a dual-purpose high definition glass of 6mm day night is moulded and is mixed fixed focus camera lens, its characterized in that includes the lens, and the surface that defines lens adjacent object plane one side is the object side, and the surface that the lens adjacent image plane one side is the image side, the lens includes from object side to image side in proper order along the camera lens optical axis:
the first lens (1) is an aspheric plastic lens with negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;
the second lens (2) is a spherical glass lens with positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens (3) is an aspheric plastic lens with positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens (4) is an aspheric plastic lens with negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
an aperture diaphragm (8) is arranged between the first lens (1) and the second lens (2), and the rear part of the fourth lens (4) is also provided with:
the optical filter (5), the optical filter (5) is made of H-K9L;
a cover glass (6) integrated on the image sensor;
an image acquisition element (7);
the ratio of the focal length of each lens to the total focal length of the system of the lens meets the following conditions:
0.76≤|f1/f|≤1.70；
0.97≤|f2/f|≤3.07；
0.56≤|f3/f|≤0.90；
0.70≤|f4/f|≤1.74；
in the relation, f is the focal length of the lens optical system, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), f3 is the focal length of the third lens (3), and f4 is the focal length of the fourth lens (4);
the focal length, refractive index and radius of curvature of the first lens (1) to the fourth lens (4) satisfy the following conditions, respectively:
in the above table, "f1" is the focal length of the first lens (1), "ND1" is the refractive index of the first lens (1), "R11, R12" is the front-rear surface radius of curvature of the first lens (1), "f2" is the focal length of the second lens (2), "ND2" is the refractive index of the second lens (2), "R21, R22" is the front-rear surface radius of curvature of the second lens (2), "f3" is the focal length of the third lens (3), "ND3" is the refractive index of the third lens (3), "R31, R32" is the front-rear surface radius of curvature of the third lens (3), "f4" is the focal length of the fourth lens (4), "ND4" is the front-rear surface radius of curvature of the fourth lens (4), "-" indicates the negative direction, and so on.
2. The 6mm day and night high-definition glass-plastic mixed fixed focus lens according to claim 1 is characterized in that:
IC/TTL≥0.29；
0.31≤OBFL/TTL≤0.44；
in the relation, the focal length of the lens optical system is f; the total length of the lens optical system is TTL; the optical back intercept of the lens system is OBFL, namely the distance from the nearest point of the image side surface of the fourth lens (4) to the image surface; the holographic height of the 1/2.7 inch chip matched with the lens system is IC.
3. The 6mm day and night high-definition glass-plastic mixed fixed focus lens according to claim 1 is characterized in that: the aperture of the lens optical system is F#, F# -2.40 is satisfied, the total length of the lens optical system is TTL, and TTL is not more than 22.50mm.
4. The 6mm day and night high-definition glass-plastic mixed fixed focus lens according to claim 1 is characterized in that: the aspheres of the first lens (1), the third lens (3) and the fourth lens (4) can be defined by the following even aspherical equation:
where k is conic coefficient of quadric, r is lens height, c is lens curvature, and A-G is 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th order polynomial coefficients of aspheric surface.
5. The 6mm day and night high-definition glass-plastic mixed fixed focus lens according to claim 1 is characterized in that: the maximum distance between the third lens (3) and the fourth lens (4) on the central axis is not more than 0.38mm.
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| CN202123451224.9U CN219871931U (en) | 2021-12-31 | 2021-12-31 | 6mm day and night high-definition glass-plastic mixed prime lens |
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| CN202123451224.9U CN219871931U (en) | 2021-12-31 | 2021-12-31 | 6mm day and night high-definition glass-plastic mixed prime lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114397750A (en) * | 2021-12-31 | 2022-04-26 | 东莞市长益光电股份有限公司 | 6mm day and night dual-purpose high-definition glass-plastic mixed prime lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114397750A (en) * | 2021-12-31 | 2022-04-26 | 东莞市长益光电股份有限公司 | 6mm day and night dual-purpose high-definition glass-plastic mixed prime lens |
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