CN111103676A - Fixed focus lens - Google Patents
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- CN111103676A CN111103676A CN202010037069.7A CN202010037069A CN111103676A CN 111103676 A CN111103676 A CN 111103676A CN 202010037069 A CN202010037069 A CN 202010037069A CN 111103676 A CN111103676 A CN 111103676A
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- 239000011521 glass Substances 0.000 claims abstract description 13
- 230000005499 meniscus Effects 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 abstract description 14
- 238000003331 infrared imaging Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 10
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- 238000013461 design Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The embodiment of the invention discloses a fixed-focus lens. The fixed-focus lens comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power which are sequentially arranged from an object side to an image side along an optical axis; the fourth lens is a glass aspheric lens; the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses; the prime lens satisfies the following conditions: IC/TTL > 0.4; where IC denotes an image plane diameter of the fixed focus lens, and TTL denotes an optical total length of the fixed focus lens. According to the technical scheme of the embodiment of the invention, on the premise that the imaging target surface reaches 1/1.8 inch, infrared imaging is not defocused under the condition of clear visible light imaging, and the requirement of 4K resolution is met, so that the cost is reduced and the performance is ensured.
Description
Technical Field
The embodiment of the invention relates to a lens technology, in particular to a fixed-focus lens.
Background
The progress of science and technology brings convenience to human beings, and along with the improvement of safety consciousness of people, the security protection also has higher-level requirements. The monitoring lens converts the shot target into an image signal, and transmits the image signal to an image processing and identifying system, so that accurate image information is stored for places such as roads, markets, schools and the like, and data is provided for information acquisition and query.
With the technical development of the communication industry and the gradual popularization of 5G, the shot video is not limited by the transmission speed and the bandwidth. And the requirement of people for monitoring the image quality is higher and higher. So 4K (3840 × 2160) resolution monitoring cameras are gradually beginning to be accepted. The traditional 4K lens generally uses a large number of lenses, and has the problems of large volume, high manufacturing cost and the like.
Disclosure of Invention
The embodiment of the invention provides a fixed-focus lens which is small in size, can realize that infrared imaging is not out of focus under the condition of clear visible light imaging on the premise that the imaging target surface reaches 1/1.8 inch, and simultaneously reaches the 4K resolution requirement, thereby not only reducing the cost, but also ensuring the performance.
The embodiment of the invention provides a fixed-focus lens, which comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, wherein the first lens, the second lens with negative focal power, the third lens with positive focal power, the fourth lens with positive focal power, the fifth lens with positive focal power, the sixth lens with negative focal power and the seventh lens with positive focal power are sequentially arranged along an optical axis from;
wherein the fourth lens is a glass aspheric lens;
the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses;
the prime lens meets the following requirements:
IC/TTL>0.4；
wherein, IC represents the image surface diameter of the fixed focus lens, TTL represents the optical total length of the fixed focus lens.
Optionally, the focal length of the first lens and the focal length of the fixed-focus lens satisfy:
0.5<|f1/f|<2；
where f1 denotes a focal length of the first lens, and f denotes a focal length of the prime lens.
Optionally, the focal length of the second lens and the focal length of the fixed-focus lens satisfy:
2.0<|f2/f|<5.5；
where f2 denotes a focal length of the second lens, and f denotes a focal length of the prime lens.
Optionally, the refractive index of the third lens is greater than 1.65.
Optionally, a focal length of the fourth lens and a focal length of the fixed-focus lens satisfy:
|f4/f|>2.0；
wherein f4 denotes a focal length of the fourth lens, and f denotes a focal length of the prime lens;
the fourth lens has an Abbe number greater than 65.
Optionally, a focal length of the fifth lens and a focal length of the fixed-focus lens satisfy:
1.5<|f5/f|<3.5；
where f5 denotes a focal length of the fifth lens, and f denotes a focal length of the prime lens.
Optionally, a focal length of the sixth lens and a focal length of the fixed-focus lens satisfy:
|f6/f|>0.5；
wherein f6 denotes a focal length of the sixth lens, and f denotes a focal length of the prime lens;
the refractive index of the sixth lens is larger than 1.6.
Optionally, the focal length of the sixth lens and the focal length of the seventh lens satisfy:
0.5<|f6/f7|<2.0；
wherein f6 denotes a focal length of the sixth lens, and f7 denotes a focal length of the seventh lens.
Optionally, the optical module further includes a diaphragm disposed between the third lens and the fourth lens.
Optionally, the first lens is a meniscus lens, the second lens is a meniscus lens, the third lens is a biconvex lens, the fourth lens is a biconvex lens, the fifth lens is a biconcave lens, the sixth lens is a biconcave lens, and the seventh lens is a biconvex lens.
The fixed focus lens provided by the embodiment of the invention comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, which are sequentially arranged from an object space to an image space along an optical axis; the fourth lens is a glass aspheric lens; the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses; the prime lens satisfies the following conditions: IC/TTL > 0.4; where IC denotes an image plane diameter of the fixed focus lens, and TTL denotes an optical total length of the fixed focus lens. By adopting the glass-plastic mixed optical structure of six plastic aspheric lenses and one glass aspheric lens, the plastic aspheric lens has smaller quality and lower cost and has good aberration eliminating capability; the middle fourth lens adopts a glass aspheric lens, the temperature deformation is small, the realization of high-low temperature infrared confocal is facilitated, the characteristics of short length and large image surface of the lens are ensured by setting IC/TTL >0.4, the infrared imaging is not out of focus under the condition that the visible light imaging is clear on the premise that the target surface reaches 1/1.8 inch, and meanwhile, the 4K resolution requirement is met, so that the cost is reduced, and the performance is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an MTF curve of a modulation transfer function of a fixed-focus lens provided in an embodiment of the present invention under visible light;
fig. 3 is a schematic diagram of an MTF curve of a fixed-focus lens provided in an embodiment of the present invention under infrared light;
fig. 4 is a schematic diagram of a chromatic aberration curve of a fixed-focus lens according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a spherical aberration curve of the fixed-focus lens according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention. Referring to fig. 1, the fixed focus lens includes a first lens 10 of negative power, a second lens 20 of negative power, a third lens 30 of positive power, a fourth lens 40 of positive power, a fifth lens 50 of positive power, a sixth lens 60 of negative power, and a seventh lens 70 of positive power, which are arranged in this order from the object side to the image side along the optical axis; wherein the fourth lens 40 is a glass aspheric lens; the first lens 10, the second lens 20, the third lens 30, the fifth lens 50, the sixth lens 60 and the seventh lens 70 are all plastic aspheric lenses; the prime lens satisfies the following conditions: IC/TTL > 0.4; where IC denotes an image plane diameter of the fixed focus lens, and TTL denotes an optical total length of the fixed focus lens.
It will be appreciated that the optical power is equal to the difference between the image-side and object-side beam convergence, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In the present embodiment, each lens can be fixed in one lens barrel (not shown in fig. 1), by reasonably distributing the optical power and the shape of the lens, for example, a first lens 10 and a second lens 20 with negative optical power are provided, and the light receiving surface of the first lens 10 is larger for receiving light, so as to increase the field angle; by arranging the fourth lens 40 at the middle position as a glass aspheric lens, the glass material has small deformation along with the temperature change, which is beneficial to realizing high and low temperature confocal; all lens surfaces are aspheric surfaces, aberration can be effectively balanced, most lenses are plastic aspheric lenses, the plastic lenses are low in cost and easy to form, the lens can realize day and night confocal function in visible and infrared bands, the imaging target surface reaches 1/1.8 inch, the lens can be matched with a 4K imaging chip, and the lens has visible light and infrared confocal function.
According to the technical scheme of the embodiment, the glass-plastic mixed optical structure of six plastic aspheric lenses and one glass aspheric lens is adopted, so that the plastic aspheric lens has smaller quality and lower cost and has good aberration eliminating capability; the middle fourth lens adopts a glass aspheric lens, the temperature deformation is small, the realization of high-low temperature infrared confocal is facilitated, the characteristics of short length and large image surface of the lens are ensured by setting IC/TTL >0.4, the infrared imaging is not out of focus in a visible light imaging clear state can be realized on the premise that the imaging target surface reaches 1/1.8 inch, the requirement of 4K resolution is met, the cost is reduced, and the performance is ensured.
On the basis of the above technical solution, optionally, with reference to fig. 1, the fixed-focus lens provided in the embodiment of the present invention further includes a diaphragm 80 disposed between the third lens 30 and the fourth lens 40. The diaphragm 80 can adjust the size of the view field, shield the far-axis light, avoid the far-axis light from influencing the imaging quality and improve the image quality.
Optionally, the first lens element 10 is a meniscus lens element, the second lens element 20 is a meniscus lens element, the third lens element 30 is a biconvex lens element, the fourth lens element 40 is a biconvex lens element, the fifth lens element 50 is a biconcave lens element, the sixth lens element 60 is a biconcave lens element, and the seventh lens element 70 is a biconvex lens element.
It is understood that, in the implementation, the shape of the specific lens can be selected according to the design of the optical power, and the above is only a specific example and is not a limitation to the embodiment of the present invention.
Optionally, the focal length of the first lens 10 and the focal length of the fixed-focus lens satisfy:
0.5<|f1/f|<2；
where f1 denotes a focal length of the first lens 10, and f denotes a focal length of the prime lens.
It is understood that in the present embodiment, the first lens 10 is a negative power lens, this arrangement is suitable for a lens with a large field angle, the design of 0.5< | f1/f | <2 is favorable for collecting light entering the lens, and in order to better converge light, the curvature radius of the surface of the first lens 10 close to the image plane is suitably smaller, and optionally, the curvature radius of the surface of the first lens 10 close to the image plane is designed to be smaller than 4mm in the present embodiment.
Optionally, the focal length of the second lens 20 and the focal length of the fixed-focus lens satisfy:
2.0<|f2/f|<5.5；
where f2 denotes the focal length of the second lens 20, and f denotes the focal length of the prime lens.
It is understood that in the present embodiment, the second lens 20 is a negative power lens, and the design of 2.0< | f2/f | <5.5 is beneficial to correcting off-axis aberration and curvature of field during imaging.
Optionally, the refractive index of the third lens 30 is greater than 1.65.
It can be understood that, in the present embodiment, the third lens 30 is a positive power lens, and the refractive index of the third lens 30 is designed to be greater than 1.65, so that the incident angle of light entering the next lens can be reduced, thereby reducing the generation of high-order aberration in the imaging process and achieving the effect of reducing the lens sensitivity.
Optionally, the focal length of the fourth lens 40 and the focal length of the fixed-focus lens satisfy:
|f4/f|>2.0；
where f4 denotes a focal length of the fourth lens 40, and f denotes a focal length of the prime lens; the abbe number of the fourth lens 40 is greater than 65.
It can be understood that in this embodiment, the fourth lens 40 is a positive power lens, and the design | f4/f | >2.0 can effectively correct the on-axis chromatic aberration during the imaging process, and to achieve this effect better, the fourth lens 40 is a glass lens, and the abbe number of the glass lens is greater than 65.
Optionally, the focal length of the fifth lens 50 and the focal length of the fixed-focus lens satisfy:
1.5<|f5/f|<3.5；
where f5 denotes a focal length of the fifth lens 50, and f denotes a focal length of the prime lens.
It can be understood that, in this embodiment, the fifth lens 50 is a positive power lens, and 1.5< | F5/F | <3.5 is designed, so that the light throughput F of the lens can be effectively increased, where F in this embodiment can reach 1.6.
Optionally, the focal length of the sixth lens 60 and the focal length of the fixed-focus lens satisfy:
|f6/f|>0.5；
where f6 denotes a focal length of the sixth lens 60, and f denotes a focal length of the prime lens; the refractive index of the sixth lens 60 is greater than 1.6.
It is understood that in the present embodiment, the sixth lens 60 adopts a negative power lens, with a design of | f6/f | >0.5 and a refractive index greater than 1.6, coma during imaging can be effectively corrected,
optionally, the focal length of the sixth lens 60 and the focal length of the seventh lens 70 satisfy:
0.5<|f6/f7|<2.0；
where f6 denotes a focal length of the sixth lens 60, and f7 denotes a focal length of the seventh lens 70.
It is understood that in the present embodiment, the seventh lens 70 is a positive power lens, and the design is 0.5< | f6/f7| <2.0, and the sixth lens 60 and the seventh lens 70 cooperate to compensate the high and low temperature effects of the lens.
Alternatively, in a certain embodiment, the first lens 10 to the seventh lens 70 satisfy the following parameters:
TABLE 1 lens parameters
Wherein f1 to f7 represent focal lengths of the first to seventh lenses in mm, n1 to n7 represent refractive indices of the first to seventh lenses, R1, R4, R7, R10, R12, R14, and R16 represent radii of curvature of the first to seventh lenses toward the center of the object side surface in this order, R2, R5, R8, R11, R13, R15, and R17 represent radii of curvature of the first to seventh lenses toward the center of the image side surface in this order, respectively, and the unit is mm, and "-" represents a negative direction.
Exemplarily, table 2 shows parameter design values of a specific embodiment of a fixed-focus lens provided in an embodiment of the present invention:
TABLE 2 design values for lenses in a refractive lens group
The surface number 3 and the surface number 6 represent virtual surfaces when the lens is designed, the surface number 1 represents the front surface of the first lens 10 close to the object space, and so on, and PL represents that the surface is a plane; r represents the radius of the spherical surface, positive represents the side of the center of the spherical surface close to the image surface, and negative represents the side of the center of the spherical surface close to the object surface; d represents the distance on the optical axis from the current surface to the next surface; nd represents a refractive index of the lens; k denotes the conic coefficient of the aspheric surface.
Alternatively, the surface shapes of the first lens 10 to the seventh lens 70 satisfy the formula:
wherein z represents a rise in a distance from a vertex of the aspherical surface when the aspherical surface is at a position having a height y in the optical axis direction,
r represents a curvature radius of the face center, k represents a conic coefficient, and A, B, C, D, E, F represents a high-order aspherical coefficient.
Table 3 shows the even term coefficients for various aspheric surfaces of the above examples:
TABLE 3 aspheric parameters
Wherein the numbers of the faces in Table 3 correspond to those in Table 2, and 6.0962283E-05 represents 6.0962283X 10-5。
The fixed-focus lens provided by the embodiment can achieve the resolution of 4K pixels in visible light and infrared states, and can obtain a clear picture even in a low-illumination environment at night.
Fig. 2 is a schematic diagram illustrating an MTF curve of a modulation transfer function of a fixed-focus lens according to an embodiment of the present invention in visible light, fig. 3 is a schematic diagram illustrating an MTF curve of a fixed-focus lens according to an embodiment of the present invention in infrared light, fig. 4 is a schematic diagram illustrating a chromatic aberration curve of a fixed-focus lens according to an embodiment of the present invention, and fig. 5 is a schematic diagram illustrating a spherical aberration curve of a fixed-focus lens according to an embodiment of the present invention. The MTF curve shown in fig. 2 is obtained under the condition that the visible light wavelength is 436nm to 656nm, and the MTF curve shown in fig. 3 is obtained under the condition that the infrared light wavelength is 850nm, and the prime lens provided by this embodiment satisfies the condition of 4K resolution for both visible light and infrared light.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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 changes, rearrangements 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 by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A fixed focus lens is characterized by comprising a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, which are sequentially arranged from an object side to an image side along an optical axis;
wherein the fourth lens is a glass aspheric lens;
the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses;
the prime lens meets the following requirements:
IC/TTL>0.4；
wherein, IC represents the image surface diameter of the fixed focus lens, TTL represents the optical total length of the fixed focus lens.
2. The prime lens according to claim 1, wherein the focal length of the first lens and the focal length of the prime lens satisfy:
0.5<|f1/f|<2；
where f1 denotes a focal length of the first lens, and f denotes a focal length of the prime lens.
3. The prime lens according to claim 1, wherein the focal length of the second lens and the focal length of the prime lens satisfy:
2.0<|f2/f|<5.5；
where f2 denotes a focal length of the second lens, and f denotes a focal length of the prime lens.
4. The prime lens according to claim 1, wherein the refractive index of the third lens is greater than 1.65.
5. The prime lens according to claim 1, wherein the focal length of the fourth lens and the focal length of the prime lens satisfy:
|f4/f|>2.0；
wherein f4 denotes a focal length of the fourth lens, and f denotes a focal length of the prime lens;
the fourth lens has an Abbe number greater than 65.
6. The prime lens according to claim 1, wherein the focal length of the fifth lens and the focal length of the prime lens satisfy:
1.5<|f5/f|<3.5；
where f5 denotes a focal length of the fifth lens, and f denotes a focal length of the prime lens.
7. The prime lens according to claim 1, wherein the focal length of the sixth lens and the focal length of the prime lens satisfy:
|f6/f|>0.5；
wherein f6 denotes a focal length of the sixth lens, and f denotes a focal length of the prime lens;
the refractive index of the sixth lens is larger than 1.6.
8. The prime lens according to claim 1, wherein the focal length of the sixth lens and the focal length of the seventh lens satisfy:
0.5<|f6/f7|<2.0；
wherein f6 denotes a focal length of the sixth lens, and f7 denotes a focal length of the seventh lens.
9. The prime lens according to claim 1, further comprising a diaphragm disposed between the third lens and the fourth lens.
10. The prime lens according to any one of claims 1 to 9, wherein the first lens element is a meniscus lens element, the second lens element is a meniscus lens element, the third lens element is a biconvex lens element, the fourth lens element is a biconvex lens element, the fifth lens element is a biconcave lens element, the sixth lens element is a biconcave lens element, and the seventh lens element is a biconvex lens element.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933974A (en) * | 2021-12-16 | 2022-01-14 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933974A (en) * | 2021-12-16 | 2022-01-14 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
| CN113933974B (en) * | 2021-12-16 | 2022-05-10 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
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