CN113640941B - Optical lens - Google Patents
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- CN113640941B CN113640941B CN202010392489.7A CN202010392489A CN113640941B CN 113640941 B CN113640941 B CN 113640941B CN 202010392489 A CN202010392489 A CN 202010392489A CN 113640941 B CN113640941 B CN 113640941B
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
The embodiment of the invention provides an optical lens. In the optical lens, a first lens is a lens with a concave image surface and a negative focal length; the third lens is a lens with a non-convex object surface, a convex image surface and a positive focal length; the fourth lens is a biconvex lens with positive focal length; the fifth lens is a meniscus lens with a convex object surface, a concave image surface and a negative focal length; the seventh lens is a biconcave lens with a negative focal length, the eighth lens is a biconvex lens with a positive focal length, and the seventh lens and the eighth lens are bonded; the tenth lens is a meniscus lens with a convex object plane, a concave image plane and a positive focal length; and, each lens satisfies predetermined optical parameters. The optical lens provided by the embodiment of the invention can realize the effects of a large aperture of 1.0, a large angle of more than 120 degrees and a large target surface of 1/1.2.
Description
Technical Field
The invention relates to the field of optics, in particular to an optical lens.
Background
The monitoring equipment is an indispensable part in monitoring scenes such as security and protection. Among them, an optical lens of a monitoring apparatus is generally composed of a plurality of lenses as an optical component for generating an image.
The inventor discovers that in the process of researching the invention:
the existing optical lens has a small aperture, namely the light transmission amount of the lens is not high, so that under a low-illumination environment with insufficient light, the image brightness is relatively low, and the imaging quality is poor; meanwhile, the field angle and the target surface of the conventional optical lens are small, so that the requirements of more and more draft image shooting cannot be well met.
Therefore, a new optical lens with a large aperture, a large angle and a large target surface is needed to improve the image quality under various environments.
Disclosure of Invention
An object of an embodiment of the present invention is to provide an optical lens that achieves the effects of a large aperture of 1.0, a large angle of 120 degrees or more, and a large target surface of 1/1.2. The specific technical scheme is as follows:
an embodiment of the present invention provides an optical lens, including: the first lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the seventh lens, the eighth lens and the tenth lens are coaxially arranged in sequence from the object space to the image space;
the first lens is a lens with a concave image surface and a negative focal length;
the third lens is a lens with a non-convex object surface, a convex image surface and a positive focal length;
the fourth lens is a biconvex lens with positive focal length;
the fifth lens is a meniscus lens with a convex object plane, a concave image plane and a negative focal length;
the seventh lens is a biconcave lens with a negative focal length, the eighth lens is a biconvex lens with a positive focal length, and the seventh lens and the eighth lens are bonded;
the tenth lens is a meniscus lens with a convex object plane, a concave image plane and a positive focal length;
wherein a focal length F of the first lens 1 And a focal length F of the third lens 3 Satisfies the following conditions: -3<F 1 /F 3 <0；
A front air interval T of the fourth lens 41 And a rear air space T of the fourth lens 42 Satisfies the following conditions: t is 41 +T 42 >5mm, and T 41 >0.5mm；
Refractive index nd of the seventh lens 7 Abbe number vd of the seventh lens 7 Refractive index nd of the eighth lens 8 And an Abbe number vd of the eighth lens 8 Satisfies the following conditions: (nd) 7 -nd 8 )/(vd 7 -vd 8 )<0；
A radius of curvature R of an object plane of the tenth lens 1 And radius of curvature R of image plane 2 Satisfies the following conditions: 0<R 1 /R 2 <1；
The front end aperture D and the maximum field angle F of the optical lens 11 And the maximum field angle F 11 The corresponding image height H satisfies: 0.005<D/H/F 11 <0.015；
The maximum field angle F 11 The maximum angle of view F 11 Corresponding image height H and lens focal length F of the optical lens 12 Satisfies the following conditions: (F) 11 ×F 12 )/H>65；
A total length L of the optical lens and an optical back focus F of the optical lens 13 Satisfies the following conditions: 0<F 13 /L<0.15；
A total length L of the optical lens and a lens focal length F of the optical lens 12 Satisfies the following conditions: 7<L/F 12 <12。
Optionally, the optical lens further includes: a second lens positioned between the first lens and the third lens and coaxially aligned;
the second lens is a negative biconcave lens of focal length;
wherein a focal length F of the first lens 1 And a focal length F of the second lens 2 Satisfies the following conditions: 0<F 1 /F 2 <1.5, and the focal length F of the second lens 2 And a focal length F of the third lens 3 Satisfies the following conditions: -2<F 2 /F 3 <0。
Optionally, the optical lens further includes: a sixth lens located after and cemented with the fifth lens;
the sixth lens element is coaxially aligned with the fifth lens element, and the sixth lens element is a biconvex lens element having a positive focal length.
Optionally, the optical lens further includes: a ninth lens coaxially aligned and located between the eighth lens and the tenth lens;
the ninth lens is a biconvex lens with positive focal length;
temperature coefficient D of the ninth lens 0 Satisfies the following conditions: -1e-6<D 0 <0。
Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are all spherical lenses.
Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are all spherical lenses made of glass.
Optionally, the first lens is a biconcave optic.
Optionally, the third lens is a meniscus lens.
The embodiment of the invention has the following beneficial effects:
the optical lens provided by the embodiment of the invention comprises: the first lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the seventh lens, the eighth lens and the tenth lens are coaxially arranged in sequence from the object space to the image space; the first lens is a lens with a concave image surface and a negative focal length; the third lens is a lens with a non-convex object surface, a convex image surface and a positive focal length; the fourth lens is a biconvex lens with positive focal length; the fifth lens is a meniscus lens with a convex object surface, a concave image surface and a negative focal length; the seventh lens is a biconcave lens with a negative focal length, the eighth lens is a biconvex lens with a positive focal length, and the seventh lens and the eighth lens are bonded; the tenth lens is a meniscus lens with a convex object plane, a concave image plane and a positive focal length; wherein the focal length F of the first lens 1 And focal length F of the third lens 3 Satisfies the following conditions: -3<F 1 /F 3 <0; front air space T of fourth lens 41 And the rear air space T of the fourth lens 42 Satisfies the following conditions: t is 41 +T 42 >5mm, and T 41 >0.5mm; refractive index nd of seventh lens 7 Abbe number vd of seventh lens 7 Refractive index nd of the eighth lens 8 And Abbe number vd of eighth lens 8 Satisfies the following conditions: (nd) 7 -nd 8 )/(vd 7 -vd 8 )<0; radius of curvature R of object plane of tenth lens 1 And radius of curvature R of image plane 2 Satisfies the following conditions: 0<R 1 /R 2 <1; front end aperture D and maximum field angle F of optical lens 11 And maximum field angle F 11 The corresponding image height H satisfies: 0.005<D/H/F 11 <0.015; maximum field angle F 11 And a maximum field angle F 11 Corresponding image height H and lens focal length F of optical lens 12 Satisfies the following conditions: (F) 11 ×F 12 )/H>65; total length L of optical lens and optical back focus F of optical lens 13 Satisfies the following conditions: 0<F 13 /L<0.15; total length L of optical lens and lens focal length F of optical lens 12 Satisfies the following conditions: 7<L/F 12 <12. The optical lens provided by the embodiment of the invention adopts the specific lens combination and the specific optical parameters to ensure that the optical lensThe lens has the effects of a large aperture of 1.0, a large angle of more than 120 degrees and a large target surface of 1/1.2, so that the image imaging quality under various environments, particularly under the low-illumination environment, is improved. In addition, the optical lens provided by the embodiment of the invention can achieve 4K high resolution through a large target surface.
In addition, each lens in the optical lens provided by the embodiment of the invention adopts the spherical lens made of glass, so that the cost is greatly reduced compared with the optical lens using the aspheric lens made of glass, and meanwhile, compared with the optical lens using the plastic aspheric surface, the optical lens has better temperature drift performance.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;
FIG. 3 is a diagram of an optical path of an optical lens shown in FIG. 2;
FIG. 4 (a) is a diagram of a Through Focus curve of an optical lens having the optical parameters shown in Table 1;
fig. 4 (b) is a field curvature diagram of an optical lens having optical parameters shown in table 1;
fig. 4 (c) is a distortion diagram of the optical lens having the optical parameters shown in table 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
For ease of understanding, the following first describes the optical parameters involved in embodiments of the present invention:
aperture: the english name, aperture, is used to control the amount of light transmitted through the lens into the light-sensing surface in the body, and is an important parameter of the lens, usually in the lens. The size of which determines how much light enters the light sensing element through the lens. The F-number is used to express the aperture size, where F = the focal length of the lens/diameter of the effective aperture of the lens. The large aperture according to the embodiment of the present invention means that the aperture value is small and the light flux amount is large.
The field angle: in an optical instrument, an angle formed by two edges of a lens, which is the maximum range in which an object image of a target to be measured can pass through, is called a field angle. The size of the field angle determines the field range of the optical instrument, and the larger the field angle, the larger the field of view, and the smaller the optical magnification.
Abbe number: also known as the dispersion coefficient, is used to measure the degree of light dispersion of a transparent medium. The abbe number is an index to express the dispersive power of a transparent medium. Generally, the larger the refractive index of the medium, the more pronounced the dispersion and the smaller the abbe number; conversely, the smaller the refractive index of the medium, the less noticeable the dispersion and the larger the Abbe number.
Radius of curvature: is the inverse of the curvature, which is a quantity describing the degree of curvature of the geometry.
Tolerance: is an error permitted in the machine manufacturing industry for the dimensions of the machine or machine part. And tolerance sensitivity is the degree of interference with the tolerance permitted by the dimensions.
Temperature drift performance: is the property that changes with ambient temperature.
Temperature coefficient: is the rate at which the physical properties of a material change with changes in temperature.
Total lens length: refers to the distance from the foremost surface of the optical lens to the image plane.
Optical back focus: refers to the distance from the last face of the last lens of the lens to the image plane.
In order to solve the problems in the prior art, embodiments of the present invention provide an optical lens to achieve the effects of a large aperture, a large angle, and a large target surface. Specifically, the optical lens provided by the embodiment of the invention can achieve the effects that the optical lens has a large aperture of 1.0, a large angle of 120 degrees or more and a large target surface of 1/1.2. Moreover, the optical lens provided by the embodiment of the invention is a fixed-focus lens, and the aperture is fixed, and meanwhile, the optical lens not only can be applied to the field of security protection, but also can be applied to other fields with monitoring requirements.
An optical lens provided in an embodiment of the present invention is described below with reference to the accompanying drawings.
An optical lens provided in an embodiment of the present invention may include:
the first lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the seventh lens, the eighth lens and the tenth lens are coaxially arranged in sequence from the object space to the image space;
the first lens is a lens with a concave image surface and a negative focal length;
the third lens is a lens with a non-convex object surface, a convex image surface and a positive focal length;
the fourth lens is a biconvex lens with positive focal length;
the fifth lens is a meniscus lens with a convex object surface, a concave image surface and a negative focal length;
the seventh lens is a biconcave lens with a negative focal length, the eighth lens is a biconvex lens with a positive focal length, and the seventh lens and the eighth lens are bonded;
the tenth lens is a meniscus lens with a convex object plane, a concave image plane and a positive focal length;
wherein the focal length F of the first lens 1 And a focal length F of the third lens 3 Satisfies the following conditions:-3<F 1 /F 3 <0；
the front air interval T of the fourth lens 41 And a rear air space T of the fourth lens 42 Satisfies the following conditions: t is 41 +T 42 >5mm, and T 41 >0.5mm；
Refractive index nd of the seventh lens 7 The Abbe number vd of the seventh lens 7 Refractive index nd of the eighth lens 8 And Abbe number vd of the eighth lens 8 Satisfies the following conditions: (nd) 7 -nd 8 )/(vd 7 -vd 8 )<0；
A radius of curvature R of an object plane of the tenth lens 1 And radius of curvature R of image plane 2 Satisfies the following conditions: 0<R 1 /R 2 <1；
The front end aperture D and the maximum field angle F of the optical lens 11 And the maximum field angle F 11 The corresponding image height H satisfies: 0.005<D/H/F 11 <0.015；
The maximum field angle F 11 The maximum field angle F 11 Corresponding image height H and lens focal length F of the optical lens 12 Satisfies the following conditions: (F) 11 ×F 12 )/H>65；
The total length L of the optical lens and the optical back focus F of the optical lens 13 Satisfies the following conditions: 0<F 13 /L<0.15；
The total length L of the optical lens and the lens focal length F of the optical lens 12 Satisfies the following conditions: 7<L/F 12 <12。
Based on the structure of the optical lens, fig. 1 exemplarily shows a schematic diagram of the optical lens provided by the embodiment of the present invention, for convenience of understanding. As shown in fig. 1, an optical lens provided in an embodiment of the present invention may include:
the lens comprises a first lens 10, a third lens 30, a diaphragm 01, a fourth lens 40, a fifth lens 50, a seventh lens 70, an eighth lens 80 and a tenth lens 100 which are coaxially arranged in sequence from an object space to an image space;
the first lens 10 is a lens with a plane object surface, a concave image surface and a negative focal length;
the third lens element 30 is a lens element having a plane object plane, a convex image plane, and a positive focal length;
the fourth lens element 40 is a biconvex lens element having a positive focal length;
the fifth lens element 50 is a meniscus lens element with a convex object plane, a concave image plane and a negative focal length;
the seventh lens element 70 is a biconcave lens element having a negative focal length, the eighth lens element 80 is a biconvex lens element having a positive focal length, and the seventh lens element 70 and the eighth lens element 80 are bonded;
the tenth lens element 100 is a meniscus lens element with a convex object plane, a concave image plane, and a positive focal length;
the optical parameters of the first lens element 10, the third lens element 30, the fourth lens element 40, the fifth lens element 50, the seventh lens element 70, the eighth lens element 80 and the tenth lens element 100 refer to the corresponding parameters given above, and are not repeated herein.
As shown in fig. 1, the optical lens may further include a filter 02, where the filter 02 may be a flat glass, and the lens may filter infrared light in the environment through the filter when used in the daytime, so as to avoid color cast. In addition, in order to clearly show the positional relationship of the respective lenses, fig. 1 shows an optical axis 03 of the optical lens.
It is understood that the object plane of each lens is the plane facing the object and belonging to the light entrance plane, and the image plane of each lens is the plane facing the image and belonging to the light exit plane.
The object plane of the first lens can be a plane, a concave surface or a convex surface, and in specific applications, the object plane can be set according to actual requirements. And when the object plane and the image plane of the first lens are both concave surfaces, the first lens is a biconcave lens. It should be noted that, when the first lens element is a biconcave lens element, it is advantageous to collect light rays with a large angle, so as to reduce the front aperture of the optical lens.
The object plane of the third lens is a non-convex surface and the image plane is a convex surface, so that light rays can be effectively diffused, and the realization of a large aperture is facilitated. The object plane of the third lens can be a plane or a concave surface; and when the object plane of the third lens is a concave surface, the third lens is a meniscus lens.
Wherein the diaphragm is disposed between the third lens and the fourth lens at a central position with respect to the optical lens. In an embodiment of the invention, the diaphragm is a perforated foil for limiting the light beam. And, the light passing hole of the diaphragm may be circular and centered on the central axis of the optical lens.
In addition, the fourth lens can enable the light collected in the front to be smoothly transited to the rear, and the effect of gently transiting the light is achieved. The object plane of the fifth lens faces the object space and is convex, the image plane faces the image space and is concave, that is, the object plane is convex, and the image plane is concave. The meniscus shape is beneficial to receiving the light ahead, and the caliber of the rear end of the lens is reduced. The air space in front of the fourth lens is a distance from the object plane of the fourth lens to the image plane of the third lens, and the air space in back of the fourth lens is a distance from the image plane of the fourth lens to the object plane of the fifth lens.
It is understood that the seventh lens and the eighth lens are bonded together to form an achromatic lens set so as to reduce chromatic aberration of light transmitted by a front component of the optical lens, and that the seventh lens and the eighth lens are bonded together to advantageously reduce tolerance sensitivity of the optical system. Wherein the seventh lens and the eighth lens may be bonded together by an optical glue.
Moreover, the tenth lens is in a meniscus shape, so that light can be rapidly converged and imaged, the total length of the optical lens can be shortened, and a large target surface can be realized.
The optical lens provided by the embodiment of the invention adopts the specific lens combination and the specific optical parameters, so that the optical lens can have the effects of a large aperture of 1.0, a large angle of more than 120 degrees and a large target surface of 1/1.2, thereby improving the image imaging quality under various environments, particularly the image imaging quality under a low-illumination environment. In addition, the optical lens provided by the embodiment of the invention can achieve 4K high resolution through a large target surface.
In an optional embodiment, the optical lens provided in the embodiment of the present invention may further include: a second lens positioned between the first lens and the third lens and coaxially aligned;
the second lens is a negative biconcave lens of focal length;
wherein the focal length F of the first lens 1 And a focal length F of the second lens 2 Satisfies the following conditions: 0<F 1 /F 2 <1.5, and the focal length F of the second lens 2 And a focal length F of the third lens 3 Satisfies the following conditions: -2<F 2 /F 3 <0。
In this embodiment, the second lens is set as a negative biconcave lens with a focal length, so that the second lens can scatter light collected by the first lens, thereby facilitating realization of a large aperture.
In addition, on the basis of containing the second lens, the third lens can be a meniscus lens, so that the third lens can further diffuse light rays by being matched with the second lens, and the realization of a large aperture is facilitated.
In an alternative embodiment, on the basis of including the first lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the seventh lens, the eighth lens, and the tenth lens, or on the basis of including the first lens, the second lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the seventh lens, the eighth lens, and the tenth lens, an optical lens provided in an embodiment of the present invention may further include: a sixth lens disposed behind and cemented to the fifth lens;
the sixth lens element is coaxially aligned with the fifth lens element, and the sixth lens element is a biconvex lens element having a positive focal length.
It should be noted that, the fifth lens and the sixth lens are bonded together, which is beneficial to reducing tolerance sensitivity of the optical lens, facilitating assembly of a better lens, and saving lens length. Wherein the fifth lens and the sixth lens can be bonded together by glue.
In an alternative embodiment, on the basis of the first lens, the third lens, the aperture stop, the fourth lens, the fifth lens, the seventh lens, the eighth lens and the tenth lens, or on the basis of the first lens, the second lens, the third lens, the aperture stop, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the tenth lens, an optical lens provided by an embodiment of the present invention may further include:
a ninth lens coaxially arranged between the eighth lens and the tenth lens;
the ninth lens is a biconvex lens with positive focal length;
temperature coefficient D of the ninth lens 0 Satisfies the following conditions: -1e-6<D 0 <0。
Through the ninth lens, the light collected from the front can be smoothly transited to the rear, that is, the ninth lens has the function of smoothly transiting the light.
In an optional embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens may all be spherical lenses to ensure low cost. Of course, it is also reasonable that some of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens may be spherical lenses, and another part of the lenses may be aspheric lenses. Compared with an optical lens using an aspheric lens, the optical lens provided by the embodiment can greatly reduce the cost because each lens in the embodiment adopts a spherical lens.
In an optional embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens may be all spherical lenses made of glass. Therefore, compared with an optical lens using a glass aspheric lens, the optical lens in the embodiment using a spherical lens can greatly reduce the cost, and compared with an optical lens using a plastic aspheric lens, because the optical lens provided by the embodiment using a glass material, the optical lens provided by the embodiment can have better temperature drift performance.
For convenience of understanding, fig. 2 exemplarily shows a schematic diagram of an optical lens provided by an embodiment of the present invention based on the above-described optical structure including the first lens, the second lens, the third lens, the stop, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens. As shown in fig. 2, an optical lens provided in an embodiment of the present invention may include:
a first lens 10, a second lens 20, a third lens 30, a diaphragm 01, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, a ninth lens 90 and a tenth lens 100 which are coaxially arranged in sequence from an object side to an image side;
the first lens 10 is a lens with a plane object surface, a concave image surface and a negative focal length;
the second lens 20 is a biconcave lens with a negative focal length;
the third lens element 30 is a lens element having a plane object plane, a convex image plane, and a positive focal length;
the fourth lens element 40 is a biconvex lens element with a positive focal length;
the fifth lens element 50 is a meniscus lens element with a convex object plane, a concave image plane and a negative focal length;
the sixth lens 60 is a biconvex lens having a positive focal length, and the sixth lens 60 is cemented with the fifth lens 50;
the seventh lens element 70 is a biconcave lens element with a negative focal length, the eighth lens element 80 is a biconvex lens element with a positive focal length, and the seventh lens element 70 and the eighth lens element 80 are bonded;
the ninth lens 90 is a biconvex lens having a positive focal length;
the tenth lens element 100 is a meniscus lens element with a convex object plane, a concave image plane, and a positive focal length;
the optical parameters of the first lens element 10, the second lens element 20, the third lens element 30, the fourth lens element 40, the fifth lens element 50, the sixth lens element 60, the seventh lens element 70, the eighth lens element 80, the ninth lens element 90 and the tenth lens element 100 refer to the corresponding parameters given above, and are not described herein again.
As shown in fig. 2, the optical lens may further include a filter 02, where the filter 02 may be a flat glass, and the lens may filter infrared light in the environment through the filter when used in the daytime, so as to avoid color cast. In addition, in order to clearly show the positional relationship of the respective lenses, fig. 1 shows an optical axis 03 of the optical lens.
Meanwhile, fig. 3 illustrates an optical path diagram of the optical lens shown in fig. 2 in order to facilitate understanding of an optical path of the optical lens shown in fig. 2.
The optical lens shown in fig. 2 has the effects of a large aperture of 1.0, a large angle of 120 degrees or more, and a large target surface of 1/1.2, thereby improving the image quality in various environments, particularly in low-illumination environments. In addition, each lens in the optical lens shown in fig. 2 is a spherical lens made of glass, which greatly reduces the cost compared with an optical lens using an aspheric lens made of glass, and meanwhile, compared with an optical lens using a plastic aspheric surface, the optical lens has better temperature drift performance.
Table 1 below exemplarily shows a set of optical parameters of each lens in an optical lens including ten lenses provided by an embodiment of the present invention. By setting the optical parameters in table 1 for each lens in the optical lens, the lens focal length F =7.135mm, the aperture F =1.0, the field angle =125 °, and the target surface 1/1.2 of the optical lens can be achieved. That is, the optical lens has the effects of a large aperture, a large angle, and a large target surface.
TABLE 1
As shown in Table 1, L 11 And L 12 Respectively an identification of the object plane and an identification of the image plane of the first lens, L 21 And L 22 Respectively the object plane and image plane of the second lens, L 31 And L 32 Respectively, the object plane and image plane of the third lens, L 41 And L 42 Respectively the object plane and the image plane of the fourth lens, L 51 And L 52 Respectively an identification of the object plane and an identification of the image plane of the fifth lens, L 61 And L 62 Respectively the mark of the object plane and the mark of the image plane of the sixth lens, L 71 And L 72 Respectively, an object plane mark and an image plane mark of the seventh lens, L 81 And L 82 Respectively an object plane and an image plane of the eighth lens element, L 91 And L 92 Respectively the object plane and the image plane of the ninth lens, L 101 And L 102 The mark of the object plane and the mark of the image plane of the tenth lens are respectively, STO represents a diaphragm, and C represents a target surface of the optical sensor.
From the data shown in table 1, the optical parameter relationships of the respective lenses shown in the above embodiments were calculated as follows:
D/H/F 11 ＝0.0133，(F 11 ×F 12 )/H＝69.558，F 13 /L＝0.114，L/F 12 ＝10.315，F 1 /F 2 ＝0.80，F 2 /F 3 ＝-0.645，(nd 7 -nd 8 )/(vd 7 -vd 8 )<0，T 41 +T 42 ＝13.88，T 41 ＝4.306，D 0 ＝-8.49E-6，R 1 /R 2 ＝0.305。
in addition, in order to intuitively embody the advantages of the optical lens provided by the embodiment of the present invention, fig. 4 (a) shows a schematic diagram of a Through Focus curve of the optical lens having each optical parameter shown in table 1. In fig. 4 (a), the highest peak of the high focal curve is concentrated, which indicates that the field curvature is small and the astigmatism is good.
Fig. 4 (b) shows a curvature of field diagram of an optical lens having the optical parameters shown in table 1; wherein the OTF coefficient is an optical transmission coefficient. In fig. 4 (b), the curves are very close, illustrating that the field curvature is small.
Fig. 4 (c) shows a distortion diagram of an optical lens having the optical parameters shown in table 1. In fig. 4 (c), the distortion is large, and the viewing angle is large.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (5)
1. An optical lens, comprising: the first lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the seventh lens, the eighth lens and the tenth lens are coaxially arranged in sequence from an object space to an image space;
the first lens is a lens with a concave image surface and a negative focal length;
the third lens is a lens with a non-convex object surface, a convex image surface and a positive focal length;
the fourth lens is a biconvex lens with positive focal length;
the fifth lens is a meniscus lens with a convex object plane, a concave image plane and a negative focal length;
the seventh lens is a biconcave lens with a negative focal length, the eighth lens is a biconvex lens with a positive focal length, and the seventh lens and the eighth lens are bonded;
the tenth lens is a meniscus lens with a convex object surface, a concave image surface and a positive focal length;
wherein a focal length F of the first lens 1 And a focal length F of the third lens 3 Satisfies the following conditions: -3<F 1 /F 3 <0；
A front air interval T of the fourth lens 41 And a rear air space T of the fourth lens 42 Satisfies the following conditions: t is 41 +T 42 >5mm, and T 41 >0.5mm；
Refractive index nd of the seventh lens 7 Abbe number vd of the seventh lens 7 Refractive index nd of the eighth lens 8 And an Abbe number vd of the eighth lens 8 Satisfies the following conditions: (nd) 7 -nd 8 )/(vd 7 -vd 8 )<0；
A radius of curvature R of an object plane of the tenth lens 1 And radius of curvature R of image plane 2 Satisfies the following conditions: 0<R 1 /R 2 <1；
The front end caliber D and the maximum field angle F of the optical lens 11 And the maximum field angle F 11 The corresponding image height H satisfies: 0.005<D/H/F 11 <0.015；
The maximum field angle F 11 The maximum angle of view F 11 Corresponding image height H and lens focal length F of the optical lens 12 Satisfies the following conditions: (F) 11 ×F 12 )/H>65；
A total length L of the optical lens and an optical back focus F of the optical lens 13 Satisfies the following conditions: 0<F 13 /L<0.15；
A total length L of the optical lens and a lens focal length F of the optical lens 12 Satisfies the following conditions: 7<L/F 12 <12；
The optical lens further includes: a second lens positioned between the first lens and the third lens and coaxially aligned; a sixth lens positioned after and cemented to the fifth lens; a ninth lens coaxially aligned and located between the eighth lens and the tenth lens;
the second lens is a negative biconcave lens of focal length; the focal length F1 of the first lens and the focal length F2 of the second lens satisfy: 0-F1/F2 <1.5, and a focal length F2 of the second lens and a focal length F3 of the third lens satisfy: -2< -F2/F3 <0;
the sixth lens is coaxially arranged with the fifth lens, and the sixth lens is a double-convex lens with a positive focal length;
the ninth lens is a biconvex lens with positive focal length; the temperature coefficient D0 of the ninth lens satisfies: -1e-6 yarn-woven fabric D0 yarn-woven fabric.
2. An optical lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are all spherical lenses.
3. An optical lens according to claim 2, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are all spherical lenses made of glass.
4. An optical lens according to claim 1, characterized in that the first lens is a biconcave optic.
5. An optical lens according to claim 1, characterized in that the third lens is a meniscus lens.
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| CN202010392489.7A CN113640941B (en) | 2020-05-11 | 2020-05-11 | Optical lens |
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| CN202010392489.7A CN113640941B (en) | 2020-05-11 | 2020-05-11 | Optical lens |
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| JP6893492B2 (en) * | 2018-06-25 | 2021-06-23 | 富士フイルム株式会社 | Imaging lens and imaging device |
| CN109375353A (en) * | 2018-11-15 | 2019-02-22 | 江西特莱斯光学有限公司 | A kind of super large aperture day and night confocal camera lens |
| CN209842210U (en) * | 2019-05-30 | 2019-12-24 | 西安杰邦科技股份有限公司 | Large-view-field athermalized visible light lens |
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