CN209946514U - Glass-plastic mixed fixed-focus lens - Google Patents
Glass-plastic mixed fixed-focus lens Download PDFInfo
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- CN209946514U CN209946514U CN201921053896.4U CN201921053896U CN209946514U CN 209946514 U CN209946514 U CN 209946514U CN 201921053896 U CN201921053896 U CN 201921053896U CN 209946514 U CN209946514 U CN 209946514U
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Abstract
The utility model discloses a burnt camera lens of fixing of mixture is moulded to glass. The glass-plastic mixed prime lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object space to an image space; the third lens is a glass spherical lens, and the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses; the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave positive focal power lens, the third lens is a double-convex positive focal power lens, the fourth lens is a convex-concave or double-concave negative focal power lens, and the fifth lens is a double-convex positive focal power lens; the ratio of the focal lengths of the second lens, the third lens, the fourth lens and the fifth lens to the whole lens meets the following conditions: 3< f2/f < 6; 1.6< f3/f < 2; 1< f5/f < 10; -1.1< f4/f5< -0.65. The embodiment of the utility model provides a technical scheme does not influence the tight shot performance when reduce cost.
Description
Technical Field
The embodiment of the utility model provides a relate to optical device technical field, especially relate to a burnt camera lens of fixing that glass is moulded and is mixed.
Background
With the improvement of safety consciousness of people, higher-level requirements are also made on security, and the monitoring lens is born immediately. Compared with the zoom lens, the fixed-focus lens is simple in design and manufacture, and the shot moving object has clear and stable images and fine and smooth pictures, so that the fixed-focus lens occupies an important position in the security monitoring industry.
At present, a 4MP camera widely used in the security field generally adopts a wide-angle security fixed focus lens with a 2.8mm focal length and a FNO1.6 or less, the lens has a large field angle and a large light transmission amount, which causes a large difficulty in aberration correction, and at the same time, to ensure day and night confocal and high and low temperature focusing, at least 2 glass lenses are generally used, and more than 5 plastic aspheric lenses are matched, which causes more lenses in the fixed focus lens, and further, the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a tight shot of mixing is moulded to glass to do not influence the tight shot performance in reduce cost.
The embodiment of the utility model provides a glass-plastic mixed prime lens, which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object space to an image space; the third lens is a glass spherical lens, and the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses;
the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave positive focal power lens, the third lens is a double-convex positive focal power lens, the fourth lens is a convex-concave or double-concave negative focal power lens, and the fifth lens is a double-convex positive focal power lens;
the ratio of the focal lengths of the second lens, the third lens, the fourth lens and the fifth lens to the entire lens satisfies the following condition:
3<f2/f<6；
1.6<f3/f<2；
1<f5/f<10；
-1.1<f4/f5<-0.65；
wherein f is the focal length of the entire lens; f2 is the focal length of the second lens; f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens.
The utility model provides a mixed tight shot is moulded to glass includes first lens, second lens, third lens, fourth lens and the fifth lens that arrange in proper order from the object space to the image space, the third lens is glass sphere lens, first lens, second lens, fourth lens and fifth lens are the plastics aspheric lens, first lens is the concave-convex negative focal power lens, the second lens is the concave-convex positive focal power lens, the third lens is the biconvex positive focal power lens, the fourth lens is the concave-convex or biconcave negative focal power lens, the fifth lens is the biconvex positive focal power lens, the ratio of the second lens, third lens, fourth lens and fifth lens and the focus of whole camera lens satisfies the following condition, 3< f2/f <6, 1.6< f3/f <2, 1< f5/f <10, -1.1< f4/f5< -0.65 for the lens quantity that constitutes whole camera lens is less, on the basis, the prime lens with the structure can achieve the same excellent performance as the prime lens with high cost in the prior art, and achieves the beneficial effect that the performance of the prime lens is not influenced while the cost is reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural diagram of a fixed focus lens with glass-plastic mixture according to an embodiment of the present invention;
fig. 2 is a view illustrating the separation of the fixed focus lens under visible light when the temperature is 20 degrees according to an embodiment of the present invention
A focal map;
fig. 3 is a view illustrating the distance between the fixed-focus lens and the infrared light at 20 ° according to an embodiment of the present invention
A focal map;
fig. 4 is a defocused view of a fixed-focus lens under visible light when the temperature is-40 ° according to an embodiment of the present invention;
fig. 5 is a defocus diagram of a fixed-focus lens under visible light when the temperature is 80 ° according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another glass-plastic hybrid prime lens provided in the embodiment of the present invention;
fig. 7 is a view illustrating the separation of the fixed focus lens under visible light when the temperature is 20 degrees according to an embodiment of the present invention
A focal map;
fig. 8 is a view illustrating the distance between the fixed-focus lens and the infrared light at 20 ° according to an embodiment of the present invention
A focal map;
fig. 9 is a defocus diagram of a fixed-focus lens under visible light at a temperature of-40 ° according to an embodiment of the present invention;
fig. 10 is a defocus diagram of a fixed-focus lens under visible light when the temperature is 80 ° according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a still another glass-plastic hybrid prime lens provided in an embodiment of the present invention;
fig. 12 is a defocus diagram of a fixed-focus lens under visible light when the temperature is 20 ° according to an embodiment of the present invention;
fig. 13 is a defocus diagram of a fixed-focus lens under infrared light at a temperature of 20 ° provided by an embodiment of the present invention;
fig. 14 is a defocus diagram of a fixed-focus lens under visible light at a temperature of-40 ° according to an embodiment of the present invention;
fig. 15 is a defocus diagram of the fixed-focus lens under visible light when the temperature is 80 ° according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the objectives of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of the present invention for the specific implementation, structure, features and effects of a glass-plastic hybrid prime lens.
The embodiment of the utility model provides a glass-plastic mixed prime lens, which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object space to an image space; the third lens is a glass spherical lens, and the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses;
the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave positive focal power lens, the third lens is a double-convex positive focal power lens, the fourth lens is a convex-concave or double-concave negative focal power lens, and the fifth lens is a double-convex positive focal power lens;
the ratio of the focal lengths of the second lens, the third lens, the fourth lens and the fifth lens to the entire lens satisfies the following condition:
3<f2/f<6；
1.6<f3/f<2；
1<f5/f<10；
-1.1<f4/f5<-0.65；
wherein f is the focal length of the entire lens; f2 is the focal length of the second lens; f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens.
The utility model provides a mixed tight shot is moulded to glass includes first lens, second lens, third lens, fourth lens and the fifth lens that arrange in proper order from the object space to the image space, the third lens is glass sphere lens, first lens, second lens, fourth lens and fifth lens are the plastics aspheric lens, first lens is the concave-convex negative focal power lens, the second lens is the concave-convex positive focal power lens, the third lens is the biconvex positive focal power lens, the fourth lens is the concave-convex or biconcave negative focal power lens, the fifth lens is the biconvex positive focal power lens, the ratio of the second lens, third lens, fourth lens and fifth lens and the focus of whole camera lens satisfies the following condition, 3< f2/f <6, 1.6< f3/f <2, 1< f5/f <10, -1.1< f4/f5< -0.65 for the lens quantity that constitutes whole camera lens is less, on the basis, the prime lens with the structure can achieve the same excellent performance as the prime lens with high cost in the prior art, and achieves the beneficial effect that the performance of the prime lens is not influenced while the cost is reduced.
The above is the core idea of the present application, and the technical solution in the embodiments of the present invention will be clearly and completely described below 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, under the premise that creative work is not done by ordinary skilled in the art, all other embodiments obtained all belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and one skilled in the art may readily devise many other varied embodiments that are not limited to the specific details disclosed herein.
Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of explanation, the schematic drawings showing the structure of the device are not partially enlarged according to the general scale, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Fig. 1 is a schematic structural diagram of a fixed-focus lens formed by mixing glass and plastic according to an embodiment of the present invention. As shown in fig. 1, the glass-plastic hybrid prime lens includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40 and a fifth lens 50 arranged in order from an object side to an image side; the third lens 30 is a glass spherical lens, and the first lens 10, the second lens 20, the fourth lens 40 and the fifth lens 50 are all plastic aspheric lenses.
The first lens 10 is a convex-concave negative power lens, the second lens 20 is a convex-concave positive power lens, the third lens 30 is a biconvex positive power lens, the fourth lens 40 is a convex-concave or biconcave negative power lens, and the fifth lens 50 is a biconvex positive power lens.
The ratio of the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50 to the entire lens satisfies the following condition: 3< f2/f < 6; 1.6< f3/f < 2; 1< f5/f <; -1.1< f4/f5< -0.65. Wherein f is the focal length of the entire lens; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; f5 is the focal length of the fifth lens 50.
It should be noted that, in this embodiment, the focal length of the first lens 10 is not particularly limited, and the focal length of the first lens 10 can be reasonably adjusted according to actual needs on the premise that the conditions among the focal powers of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the entire lens are satisfied.
By way of example, the glass-plastic mixed fixed focus lens provided by the embodiment can achieve the field angle of 1 ° and FNO of 1.6 under a 1/2.7 inch target surface CMOS, can achieve the resolution of up to four million pixels under visible light and infrared light, has a temperature compensation function, has a resolution performance of not losing focus from-degree to +80 degrees, namely, is a 4MP day and night confocal large-aperture wide-angle security fixed focus lens, and can be widely applied to security scenes with high performance requirements. In addition, only one lens in the plurality of lenses of the lens is high in price, the prices of the other lenses are low, the total number of the lenses of the whole lens is small, the cost of the lens is low, and the performance of the lens is the same as that of the lens which is high in price in the prior art.
The prime lens with glass-plastic mixture provided by the embodiment comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40 and a fifth lens 50 which are sequentially arranged from an object side to an image side, wherein the third lens 30 is a glass spherical lens, the first lens 10, the second lens 20, the fourth lens 40 and the fifth lens 50 are all plastic aspheric lenses, the first lens 10 is a convex-concave negative-power lens, the second lens 20 is a convex-concave positive-power lens, the third lens 30 is a double-convex positive-power lens, the fourth lens 40 is a convex-concave or double-concave negative-power lens, the fifth lens 50 is a double-convex positive-power lens, the ratio of the focal lengths of the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 to the whole lens meets the following conditions, 3< f2/f <6, 1.6< f3/f <2, 1< f5/f < -and 1.1< f 4/5 < -0.65 >, the number of the lenses forming the whole lens is small, only one glass spherical lens with high price is adopted, and other lenses all adopt plastic aspheric lenses with relatively low price, so that the beneficial effect of reducing the cost of the fixed-focus lens is achieved.
Optionally, the first lens 10 and the second lens 20 are tightly fitted by a first spacer, the second lens 20 and the third lens 30 are tightly fitted by a second spacer, and the third lens 30 and the fourth lens 40 are tightly fitted by a third spacer.
It should be noted that, through spacer ring tight fit on the one hand can avoid contact wear between two lenses, guaranteed that the performance of lens does not receive wearing and tearing influence variation, on the other hand through the size of reasonable setting spacer ring, can make the distance between two lenses reach preset distance, guarantee that the distance between two lenses is accurate.
Alternatively, on the basis of the above embodiment, the fourth lens 40 and the fifth lens 50 are bonded by glue.
It should be noted that the glue adhesion can avoid relative displacement between the two lenses, ensure that the relative positions of the two lenses are not easily changed, and further avoid the situation that the light path is changed due to the change of the positions of the two lenses.
Alternatively, on the basis of the above embodiment, the fourth lens 40 and the fifth lens 50 are fitted closely.
It should be noted that, in the close-fitting, i.e. without a medium between the two lenses, there is no other part between the two lenses, and there is no gap. The arrangement can reduce the total number of parts in the fixed-focus lens, simplify the structure of the fixed-focus lens, and is simple and convenient to assemble and easy to operate, thereby being beneficial to simplifying the fixed-focus preparation process.
It should be further noted that, in this embodiment, only the first lens 10 and the second lens 20 are tightly fitted through the first spacer, the second lens 20 and the third lens 30 are tightly fitted through the second spacer, the third lens 30 and the fourth lens 40 are tightly fitted through the third spacer, the fourth lens 40 and the fifth lens 50 are bonded through glue, and the fourth lens 40 and the fifth lens 50 are tightly fitted.
Optionally, the surface type of the aspheric lens satisfies the formula:
wherein z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction, the radial distance on the diagonal of r, k is the conic coefficient of the best fitting cone, C is the reciprocal of the curvature radius, and A, B, C, D, E and F are aspheric coefficients.
Illustratively, as described above, the FNO of the fixed focus lens is 1.6. Further, the field angle FOV of the fixed focus lens at the 1/2.7 inch target surface CMOS is equal to 110 deg..
It is understood that the performance characteristics are the performance characteristics of the expensive 4MP day and night work focus lens in the prior art, and the present embodiment achieves the performance characteristics by using the relatively lower price fixed focus lens.
It should be noted that, in other embodiments of this embodiment, the performance of the fixed-focus lens provided in this embodiment may also be close to the performance of the expensive 4MP day and night work focus lens in the prior art, and specifically may be adjusted according to the user tolerance, and all schemes within the user tolerance range are within the protection range of this embodiment.
Three examples are provided below for a specific illustration of the protocol:
example one
For an exemplary structure of the fixed focus lens with glass-plastic mixture provided in the first embodiment, refer to fig. 1 specifically.
Specifically, the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the entire lens in the glass-plastic hybrid prime lens, and the field angle and FNO of the prime lens at the 1/2.7-inch target surface CMOS are shown in table one below.
| f2/f | 3.5 |
| f3/f | 1.7 |
| f5/f | 1.2 |
| f4/f5 | -0.9 |
| Angle of view | 116.4 |
| FNO | 1.6 |
The structural parameters of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the imaging plate 60 are as shown in table two below. Specifically, table two shows lens data sequentially arranged from the object space to the image space, and includes a surface type, a radius R (unit: mm), a thickness D (unit: mm), a refractive index N, and a cone coefficient K of a best-fit cone, where numbers 1 and 2 are an object space surface and an image space surface of the first lens 10, numbers 3 and 4 are an object space surface and an image space surface of the second lens 20, numbers 5 and 6 are an object space surface and an image space surface of the third lens 30, numbers 7 and 8 are an object space surface and an image space surface of the fourth lens 40, number 9 is an object space surface and an image space surface of the fifth lens 50, and numbers 11 and 12 are an object space surface and an image space surface of the imaging plate 60.
Wherein, the surface serial number is 1, 2, 3, 4, 7, 8, 9, 10 in table two is the aspheric surface, and table three shows the surface type parameter that is the aspheric lens in the tight-focus lens that the embodiment of the utility model provides.
Watch two
Specifically, the aspherical surface coefficients of the fixed focus lens are shown in table three below.
Watch III
| Number of noodles | A | B | C | D | E | F |
| 1 | -5.238E-03 | -3.939E-04 | 6.332E-05 | -4.003E-06 | 1.257E-07 | -1.6E-09 |
| 2 | -2.696E-03 | -5.212E-04 | 1.434E-04 | 1.054E-05 | -2.6E-06 | -5.387E-08 |
| 3 | 3.031E-03 | 2.416E-04 | -3.238E-04 | 3.097E-05 | -3.985E-06 | 1.572E-07 |
| 4 | 1.086E-03 | -2.254E-04 | 4.824E-05 | -1.245E-05 | 1.392E-06 | -6.6E-08 |
| 7 | 6.068E-04 | 1.829E-04 | -8.556E-04 | 8.015E-04 | -2.262E-05 | 9.895E-07 |
| 8 | 1.253E-02 | -2.847E-04 | -5.261E-04 | 1.815E-04 | -1.888E-05 | 7.344E-07 |
| 9 | 2.216E-03 | -1.0E-03 | 4.929E-05 | 1.249E-05 | -1.495E-06 | 5.354E-08 |
| 10 | -3.3E-03 | 1.239E-04 | -4.318E-05 | 7.431E-06 | -8.1E-07 | 6.238E-08 |
wherein-5.238E-03 indicates that the coefficient A of face number 1 is-5.238X 10-3。
Fig. 2 is a defocused view of the fixed-focus lens under visible light when the temperature is 20 ° according to the embodiment of the present invention. Fig. 3 is a defocused view of the fixed-focus lens under infrared light when the temperature is 20 ° provided by the embodiment of the present invention. Fig. 4 is a defocused view of the fixed-focus lens under visible light when the temperature is-40 ° according to the embodiment of the present invention. Fig. 5 is a defocused view of the fixed-focus lens under visible light when the temperature is 80 ° according to the embodiment of the present invention. Fig. 2 to 5 are all obtained based on the glass-plastic hybrid fixed focus lens provided in the first embodiment. Specifically, referring to fig. 2 and 3, the glass-plastic mixed fixed-focus lens provided in this embodiment is confocal day and night. Referring to fig. 1, 4 and 5, the fixed focus lens of glass-plastic mixture provided by the present embodiment has a resolution performance of no out-of-focus from-40 degrees to +80 degrees.
Example two
Fig. 6 is a schematic structural diagram of a still another fixed-focus lens with glass-plastic mixture according to an embodiment of the present invention. The structure of the prime lens of the second embodiment is shown in fig. 6.
Specifically, the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the entire lens in the glass-plastic hybrid prime lens, and the field angles and FNOs of the prime lens at the 1/2.7-inch target surface CMOS are shown in table four below.
Watch four
| f2/f | 5.8 |
| f3/f | 1.8 |
| f5/f | 9.3 |
| f4/f5 | -0.7 |
| Angle of view | 116.4 |
| FNO | 1.6 |
The structural parameters of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens, and the imaging plate 60 are as shown in table five below. Specifically, table five shows lens data sequentially arranged from the object space to the image space, and includes a surface type, a radius R (unit: mm), a thickness D (unit: mm), a refractive index N, and a cone coefficient K of a best-fit cone, where numbers 1 and 2 are an object space surface and an image space surface of the first lens 10, numbers 3 and 4 are an object space surface and an image space surface of the second lens 20, numbers 5 and 6 are an object space surface and an image space surface of the third lens 30, number 7 is an image space surface of the fourth lens 40, numbers 8 and 9 are an object space surface and an image space surface of the fifth lens 50, and numbers 10 and 11 are an object space surface of the imaging plate 60.
Wherein, the surface that table five middle surface serial numbers are 1, 2, 3, 4, 7, 8, 9 is the aspheric surface, and table six shows that the utility model discloses aspheric surface lens's in the tight shot that provides face type parameter.
Watch five
Specifically, the aspherical surface coefficients of the fixed focus lens are shown in table six below.
Watch six
wherein-5.125E-03 indicates that the coefficient A of face number 1 is-5.125X 10-3。
Fig. 7 is a defocused view of the fixed-focus lens under visible light when the temperature is 20 ° according to the embodiment of the present invention. Fig. 8 is a defocused view of the fixed-focus lens under infrared light when the temperature is 20 ° provided by the embodiment of the present invention. Fig. 9 is a defocus diagram of the fixed-focus lens under visible light when the temperature is-40 ° according to an embodiment of the present invention. The figure is the out-of-focus figure of the prime lens under the visible light when the temperature is 80 degrees that the embodiment of the utility model provides. Fig. 7 to fig. are all obtained based on the glass-plastic mixed fixed focus lens provided in the second embodiment. Specifically, referring to fig. 7 and 8, the glass-plastic mixed fixed-focus lens provided in this embodiment is confocal day and night. Referring to fig. 7, 9 and the drawings, the fixed focus lens of the glass-plastic mixture provided by the present embodiment has a resolution performance of no out-of-focus from-40 degrees to +80 degrees.
EXAMPLE III
Fig. 11 is a schematic structural diagram of a still another fixed-focus lens with glass-plastic mixture according to an embodiment of the present invention. The structure of the prime lens of the third embodiment is shown in fig. 11.
Specifically, the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the entire lens in the glass-plastic hybrid prime lens, and the field angles and FNOs of the prime lens at the 1/2.7-inch target surface CMOS are shown in table seven below.
Watch seven
| f2/f | 5.0 |
| f3/f | 2.0 |
| f5/f | 30.7 |
| f4/f5 | -1.0 |
| Angle of view | 109.6 |
| FNO | 1.63 |
The structural parameters of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the imaging plate 60 are as shown in table eight below. Specifically, table eight shows lens data sequentially arranged from the object space to the image space, including the surface type, the radius R (unit: mm), the thickness D (unit: mm), the refractive index N, and the conic coefficient K of the best-fit cone, where numbers 1 and 2 are the object space surface and the image space surface of the first lens 10, numbers 3 and 4 are the object space surface and the image space surface of the second lens 20, numbers 5 and 6 are the object space surface and the image space surface of the third lens 30, number 7 is the image space surface of the fourth lens 40, numbers 8 and 9 are the object space surface and the image space surface of the fifth lens 50, and numbers 10 and 11 are the object space surface and the image space surface of the imaging plate 60.
Wherein, the surface that the surface serial number is 1 in table eight, 2, 3, 4, 7, 8, 9 is the aspheric surface, shows in table nine to be the utility model provides a face type parameter of aspheric lens in the tight shot.
Table eight
| Number of noodles | Surface type | R | | N | K | |
| 1 | Aspherical surface | 5.15 | 2.01 | 1.54 | -0.05 | |
| 2 | Aspherical surface | 2.00 | 3.94 | -0.13 | ||
| 3 | Aspherical surface | -4.76 | 3.01 | 1.63 | 0.29 | |
| 4 | Aspherical surface | -4.39 | 0.08 | 1.93 | ||
| 5 | Spherical surface | 7.70 | 3.64 | 1.50 | 0.00 | |
| 6 | Spherical surface | -7.70 | 0.08 | 0.00 | ||
| 7 | Aspherical surface | 289.39 | 0.90 | 1.63 | -2.05 | |
| 8 | Aspherical surface | 2.82 | 3.07 | 1.54 | -1.28 | |
| 9 | Aspherical surface | -8.48 | 4.80 | -11.37 | ||
| 10 | Plane surface | 0.00 | 0.80 | 1.52 | 0.00 | |
| 11 | Plane surface | 0.00 | 0.10 | 0.00 |
Specifically, the aspherical surface coefficients of the fixed focus lens are shown in table nine below.
Watch nine
| Number of noodles | A | B | C | D | E | F |
| 1 | -1.3E-03 | -1.8E-04 | 3.361E-05 | -1.904E-06 | 5.134E-08 | -5.796E- |
| 2 | -9.455E-03 | -2.013E-04 | 2.642E-04 | -2.919E-05 | 1.858E-06 | -4.379E-08 |
| 3 | -3.8E-03 | 3.659E-04 | -2.263E-04 | 5.0E-05 | -2.595E-06 | -3.023E-07 |
| 4 | 1.007E-03 | 2.467E-04 | -4.0E-05 | 1.679E-05 | -2.382E-06 | 1.6E-07 |
| 7 | -1.075E-03 | 1.889E-04 | -3.372E-05 | 3.286E-07 | 6.041E-07 | -5.226E-08 |
| 8 | 1.893E-02 | -1.139E-03 | 8.884E-04 | -1.554E-04 | 1.653E-05 | -7.8E-07 |
| 9 | -1.156E-03 | 2.556E-04 | -3.635E-05 | 7.474E-06 | -9.094E-07 | 4.668E-08 |
wherein-1.3E-03 represents that the coefficient A of the face number 1 is-1.3 E.times.10-3。
Fig. 12 is a defocus diagram of the fixed-focus lens under visible light when the temperature is 20 ° according to an embodiment of the present invention. Fig. 13 is a defocus diagram of the fixed-focus lens under infrared light when the temperature is 20 ° provided by the embodiment of the present invention. Fig. 14 is a defocus diagram of the fixed-focus lens under visible light when the temperature is-40 ° according to an embodiment of the present invention. Fig. 15 is a defocus diagram of the fixed-focus lens under visible light when the temperature is 80 ° according to an embodiment of the present invention. Fig. 12 to 15 are all obtained based on the glass-plastic hybrid prime lens provided in the third embodiment. Specifically, referring to fig. 12 and 13, the glass-plastic mixed fixed-focus lens provided in this embodiment is confocal day and night. Referring to fig. 12, 14 and 15, the fixed focus lens of glass-plastic mixture provided by the present embodiment has a resolution performance of no out-of-focus from-40 degrees to +80 degrees.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (7)
1. A glass-plastic mixed prime lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object space to an image space; the third lens is a glass spherical lens, and the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses;
the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave positive focal power lens, the third lens is a double-convex positive focal power lens, the fourth lens is a convex-concave or double-concave negative focal power lens, and the fifth lens is a double-convex positive focal power lens;
the ratio of the focal lengths of the second lens, the third lens, the fourth lens and the fifth lens to the entire lens satisfies the following condition:
3<f2/f<6；
1.6<f3/f<2；
1<f5/f<10；
-1.1<f4/f5<-0.65；
wherein f is the focal length of the entire lens; f2 is the focal length of the second lens; f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens.
2. The fixed focus lens as claimed in claim 1, wherein the first lens and the second lens are tightly fitted by a first spacer; the second lens and the third lens are assembled in a tight fit mode through a second spacer ring; and the third lens and the fourth lens are assembled through a third space ring in a tight fit mode.
3. The prime lens according to claim 2, wherein the fourth lens and the fifth lens are bonded by glue.
4. The prime lens according to claim 2, wherein the fourth lens and the fifth lens are fitted in close proximity.
5. The prime lens according to claim 1, wherein the aspheric lens has a surface type satisfying the formula:
wherein z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction, the radial distance on the diagonal of r, k is the conic coefficient of the best fitting cone, C is the reciprocal of the curvature radius, and A, B, C, D, E and F are aspheric coefficients.
6. The prime lens according to claim 1, wherein FNO of the prime lens is 1.6.
7. The prime lens as claimed in claim 1, wherein the field angle FOV of the prime lens under a 1/2.7 inch target surface CMOS is equal to 110 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110187476A (en) * | 2019-07-08 | 2019-08-30 | 东莞市宇瞳光学科技股份有限公司 | A kind of tight shot that glass modeling is mixed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110187476A (en) * | 2019-07-08 | 2019-08-30 | 东莞市宇瞳光学科技股份有限公司 | A kind of tight shot that glass modeling is mixed |
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