CN108254881B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN108254881B CN108254881B CN201810259726.5A CN201810259726A CN108254881B CN 108254881 B CN108254881 B CN 108254881B CN 201810259726 A CN201810259726 A CN 201810259726A CN 108254881 B CN108254881 B CN 108254881B
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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 invention discloses an optical lens, which is formed by lenses with specific structural shapes and reasonably distributed optical focuses and can achieve tens of millions of pixel-level resolution under a more compact framework. In addition, the optical lens of the embodiment of the invention also has lower cost due to simple structure. By adopting the structural shape of the optical lens system provided by the invention, parameters such as Abbe coefficients of optical glass materials are well matched with imaging conditions, so that spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and position chromatic aberration of the lens system are well corrected, the whole image surface can be uniformly imaged, and the day and night dual-purpose function can be realized; the use requirement of the 4K camera is met, the structure is compact, and the overall dimension is small. In addition, all optical lenses adopt a spherical surface design, the cold machining process performance of the lenses is good, the cost of glass materials is low, the price of finished lenses is also low, and the yield of mass production is high; but wide application in security protection control field.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens.
Background
With the development of the security monitoring industry, 1080P high-definition videos become the mainstream, but the goals pursued by the security monitoring lens are always to improve the image definition and the image quality, and the 4K technology comes up at the end; along with the technical innovation and breakthrough of data transmission technology, data storage technology, image processing technology and high-definition television display technology in recent years, the realization of ultra-high-definition video monitoring with 4K resolution becomes possible and is bound to become the development trend in the future, which requires a lens (lens system) to have higher resolution to meet the imaging requirement of a 4K camera.
At present, the resolution level of the existing lens in a visible light mode can only meet the requirements of a camera with less than 500 million pixels (most of the lenses are less than 200 million pixels), and when the lens is switched to an infrared mode at night, the confocal performance is poor, and the actual imaging definition is worse than the visible light effect.
In conclusion, the existing lens cannot meet the development requirements of the current and future ultra-high definition security monitoring system.
Disclosure of Invention
The optical lens provided by the embodiment of the invention is used for solving the problems that the existing lens has complex structure, low resolving power and poor optical performance and cannot meet the requirements of camera equipment with higher camera shooting requirements.
Accordingly, an embodiment of the present invention provides an optical lens, in order from an object side to an image side along an optical axis, including: the optical lens comprises a first meniscus lens with negative focal power, a first biconvex lens with positive focal power, a first biconcave lens with negative focal power, a second biconvex lens with positive focal power, a first cemented lens group with negative focal power, a second cemented lens group with negative focal power, a third cemented lens group with positive focal power, an optical filter and an image plane; the surface of the first meniscus lens facing the object side is a convex surface.
Preferably, in the optical lens barrel according to an embodiment of the present invention, the first cemented lens group includes:
a third biconvex lens with positive focal power;
a second biconcave lens having negative optical power;
the third biconvex lens and the second biconcave lens are seamlessly cemented to form a first cemented lens group.
Preferably, in the optical lens barrel according to an embodiment of the present invention, the second cemented lens group includes:
a third biconcave lens having negative optical power;
a fourth biconvex lens with positive focal power;
the third biconcave lens and the fourth biconvex lens are seamlessly cemented to form a second cemented lens group.
Preferably, in the optical lens barrel provided by the embodiment of the present invention, the third cemented lens group includes:
a fifth biconvex lens with positive focal power;
a fourth biconcave lens having negative optical power;
a second meniscus lens having a positive refractive power; the surface of the second meniscus lens facing the object side is a convex surface;
the fifth biconvex lens, the fourth biconcave lens, and the second meniscus lens are seamlessly cemented to form a third cemented lens group.
Preferably, in the optical lens barrel according to the embodiment of the present invention, abbe numbers of the third biconvex lens, the fourth biconvex lens and the second meniscus lens are all greater than 65.
Preferably, in the optical lens provided in the embodiment of the present invention, a relative aperture of the optical lens is 1.65.
Preferably, in the optical lens system provided in the embodiment of the present invention, an effective focal length of the first biconcave lens and an effective focal length of the optical lens system satisfy a first predetermined relationship, and an effective focal length of the second biconvex lens and an effective focal length of the optical lens system satisfy a second predetermined relationship;
wherein the first setting relationship is: 0.9 < | f1The/f | < 1.5, and the second setting relationship is as follows: 0.8 < | f2/f|＜1.2，f1Represents an effective focal length, f, of the first biconcave lens2Represents an effective focal length of the second biconvex lens, and f represents an effective focal length of the optical lens.
Preferably, in the optical lens provided in the embodiment of the present invention, the optical lens satisfies the following conditional expressions:
L/y<3.5
wherein: l denotes a total length of the optical lens, and y denotes a size of the image plane.
Preferably, in the optical lens assembly provided by the embodiment of the present invention, the refractive index of the first biconvex lens and the refractive index of the second biconvex lens are both greater than 1.8.
Preferably, in the optical lens provided by the embodiment of the present invention, the optical lens further includes a stop, and the stop is located between the first cemented lens group and the second cemented lens group.
An optical lens provided in an embodiment of the present invention includes, in order from an object side to an image side along an optical axis: the optical lens comprises a first meniscus lens with negative focal power, a first biconvex lens with positive focal power, a first biconcave lens with negative focal power, a second biconvex lens with positive focal power, a first cemented lens group with negative focal power, a second cemented lens group with negative focal power, a third cemented lens group with positive focal power, an optical filter and an image plane; the surface of the first meniscus lens facing the object side is a convex surface. Therefore, the optical lens formed by the lenses with the specific structural shapes and distributed by reasonable optical focal lengths can achieve tens of millions of pixel-level resolution under a compact framework. In addition, the optical lens of the embodiment of the invention also has lower cost due to simple structure. By adopting the structural shape of the optical lens system provided by the invention, parameters such as Abbe coefficients of optical glass materials are well matched with imaging conditions, so that spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and position chromatic aberration of the lens system are well corrected, the whole image surface can be uniformly imaged, and the day and night dual-purpose function can be realized; the use requirement of the 4K camera is met, the structure is compact, and the overall dimension is small. In addition, all optical lenses adopt a spherical surface design, the cold machining process performance of the lenses is good, the cost of glass materials is low, the price of finished lenses is also low, and the yield of mass production is high; but wide application in security protection control field.
Drawings
FIG. 1 is a schematic structural diagram of an optical lens system according to an embodiment of the present invention;
FIG. 2 is a graph of MTF in the visible portion according to a first embodiment of the present invention;
FIG. 3 is a graph of MTF in the mid-infrared region according to an embodiment of the present invention;
FIG. 4 is a graph of MTF in the visible portion of the second embodiment of the present invention;
fig. 5 is a graph of MTF in the infrared portion in the second embodiment of the present invention.
Detailed Description
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; it is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an optical lens, sequentially from an object side to an image side along an optical axis, comprising: the optical lens comprises a first meniscus lens 1 with negative focal power, a first biconvex lens 2 with positive focal power, a first biconcave lens 3 with negative focal power, a second biconvex lens 4 with positive focal power, a first cemented lens group A with negative focal power, a second cemented lens group B with negative focal power, a third cemented lens group B with positive focal power, an optical filter L and an image plane F; the surface of the first meniscus lens 1 facing the object side is convex.
According to the optical lens provided by the embodiment of the invention, the optical lens formed by the lenses with the specific structural shapes and distributed by reasonable optical power can achieve tens of millions of pixel-level resolution under a compact framework. In addition, the optical lens of the embodiment of the invention also has lower cost due to simple structure. By adopting the structural shape of the optical lens system provided by the invention, parameters such as Abbe coefficients of optical glass materials are well matched with imaging conditions, so that spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and position chromatic aberration of the lens system are well corrected, the whole image surface can be uniformly imaged, and the day and night dual-purpose function can be realized; the use requirement of the 4K camera is met, the structure is compact, and the overall dimension is small. In addition, all optical lenses adopt a spherical surface design, the cold machining process performance of the lenses is good, the cost of glass materials is low, the price of finished lenses is also low, and the yield of mass production is high; but wide application in security protection control field.
In practical implementation, in the optical lens provided in the embodiment of the present invention, as shown in fig. 1, the first cemented lens group a includes:
a third biconvex lens 5 having positive optical power;
a second biconcave lens 6 having negative optical power;
the third biconvex lens 5 and the second biconcave lens 6 are seamlessly cemented to form the first cemented lens group a.
Because the third biconvex lens 5 with positive focal power has negative chromatic aberration, and the second biconcave lens 6 with negative focal power has positive chromatic aberration, the third biconvex lens 5 and the second biconcave lens 6 with negative focal power are seamlessly cemented to form the first cemented lens group to realize chromatic aberration mutual compensation, eliminate chromatic aberration, optimize imaging definition, improve image quality of an optical system and improve resolution.
In practical implementation, in the optical lens provided in the embodiment of the present invention, as shown in fig. 1, the second cemented lens group B includes:
a third biconcave lens 7 having negative refractive power;
a fourth biconvex lens 8 having positive optical power;
the third biconcave lens 7 and the fourth biconvex lens 8 are seamlessly cemented to form a second cemented lens group B.
The second cemented lens group has similar action with the first cemented lens group, and is used for chromatic aberration mutual compensation, eliminating chromatic aberration, optimizing imaging definition, improving image quality of an optical system and improving resolution.
In practical implementation, in the optical lens provided in the embodiment of the present invention, as shown in fig. 1, the third cemented lens group C includes:
a fifth biconvex lens 9 having positive optical power;
a fourth biconcave lens 10 having negative optical power;
a second meniscus lens 11 having a positive refractive power; the surface of the second meniscus lens 11 facing the object side is a convex surface;
the fifth biconvex lens 9, the fourth biconcave lens 10 and the second meniscus lens 11 are seamlessly cemented to form a third cemented lens group C.
The third cemented lens group has similar action with the first cemented lens group, and is used for chromatic aberration mutual compensation, eliminating chromatic aberration, optimizing imaging definition, improving image quality of an optical system and improving resolution.
In further implementation, in the optical lens provided by the embodiment of the present invention, abbe numbers of the third biconvex lens, the fourth biconvex lens and the second meniscus lens are all greater than 65.
In further concrete implementation, in the optical lens provided by the embodiment of the present invention, the relative aperture of the optical lens is 1.65.
Further, the air conditioner is provided with a fan,in the optical lens system provided in the embodiment of the present invention, the effective focal length of the first biconcave lens and the effective focal length of the optical lens system satisfy a first setting relationship, where the first setting relationship is: 0.9 < | f1/f|＜1.5，f1Denotes an effective focal length of the first biconcave lens, and f denotes an effective focal length of the optical lens.
When f1If the value of/f | exceeds the upper limit of 1.5, f1The optical back focus is insufficient, and the structural space is difficult to arrange parts such as an automatic switching device of the red filter and the like;
when f1If the value of/f is less than the lower limit of 0.9, f1Relatively small, i.e. relatively large, powers, which results in increased high-order aberrations.
Therefore, the optical lens in the embodiment of the invention satisfies the condition 0.9 < | f1When the/f | < 1.5, better imaging quality and a reasonable structural space form can be realized.
Further, in a specific implementation, in the optical lens provided in the embodiment of the present invention, an effective focal length of the second biconvex lens and an effective focal length of the optical lens satisfy a second setting relationship, where the second setting relationship is: 0.8 < | f2/f|＜1.2，f2Denotes an effective focal length of the second biconvex lens, and f denotes an effective focal length of the optical lens.
When f2If the value of/f | exceeds the upper limit of 1.2, f2The total length of the optical system is too long, which damages the miniaturization of the lens;
when f2If the value of/f is less than the lower limit of 0.8, f2Relatively small, i.e., relatively large, power, which causes an increase in high-order aberration, requires a large number of lenses, and makes it difficult to realize an optical system with good imaging performance from a small number of lens structures.
Therefore, the optical lens in the embodiment of the invention satisfies the condition 0.8 < | f2When the/f is less than 1.2, the reasonable structural space form is realized, and the imaging quality is better.
In further concrete implementation, in the optical lens provided in the embodiment of the present invention, the optical lens satisfies the following conditional expression:
L/y<3.5
wherein: l denotes a total length of the optical lens, and y denotes a size of an image plane.
In further concrete implementation, in the optical lens provided in the embodiment of the present invention, both the refractive index of the first biconvex lens and the refractive index of the second biconvex lens are greater than 1.8.
In specific implementation, as shown in fig. 1, in the optical lens provided in the embodiment of the present invention, the optical lens further includes a stop 12, and the stop 12 is located between the first cemented lens group a and the second cemented lens group B, so as to reasonably intercept light beams and improve image quality.
In order to facilitate understanding of the optical lens provided in the present embodiment, the optical lens provided in the present embodiment is further described in detail below with reference to the drawings.
The following will give two examples of the optical lens according to the embodiment of the present invention. It should be noted that the following tables I and II are preferred data, not intended to limit the invention, and that appropriate changes in the parameters or settings may be made by one skilled in the art in view of the present disclosure without departing from the scope of the invention.
The first embodiment is as follows:
The effective focal length of the optical system provided by the first table is 11.216mm, the clear aperture is F/1.65, and the total length of the optical system is 30.3 mm. In table 1, mirror numbers 1 and 2 sequentially represent two mirror surfaces of the lens 1 in the light incident direction, mirror numbers 3 and 4 represent two mirror surfaces of the lens 2 in the light incident direction, mirror numbers 5 and 6 represent two mirror surfaces of the lens 3 in the light incident direction, mirror numbers 7 and 8 represent two mirror surfaces of the lens 4 in the light incident direction, mirror number 9 represents a mirror surface of the lens 5 facing the object, mirror number 10 represents a cemented surface of the lens 5 and the lens 6, mirror number 11 represents a mirror surface of the lens 6 facing the image side, mirror number 12 represents a mirror surface of the lens 7 facing the object side, mirror number 13 represents a cemented surface of the lens 7 and the lens 8, mirror number 14 represents a mirror surface of the lens 8 facing the image side, mirror number 15 represents a mirror surface of the lens 9 facing the object side, mirror number 16 represents a cemented surface of the lens 9 and the lens 10, mirror surface number 17 represents a bonding surface of the lens 10 and the lens 11, and mirror surface number 18 represents a mirror surface of the lens 11 facing the image side.
In specific implementation, in the first embodiment, the thickness of the diaphragm is 0.255mm, and the refractive index is 5.848; the thickness of the optical filter is 0.700mm, the refractive index is 1.517, and the Abbe constant is 64.212; the image plane has a thickness of 0.497 and a refractive index of 8.732.
In the first embodiment of the present invention, | f113.959/11.216 equals 1.244, and satisfies 0.9 < | f1/f|＜1.5。
In the first embodiment of the present invention, | f210.677/11.216 is 0.952, which satisfies 0.8 < | f2/f|＜1.2。
In the first embodiment of the present invention, the abbe number of the third biconvex lens is 68.525, the abbe number of the fourth biconvex lens is 81.595, and the abbe number of the second meniscus lens is 68.525, which are all greater than 68.
In the first embodiment of the present invention, the refractive index of the first biconvex lens is 2.001, and the refractive index of the second biconvex lens is 2.051, which are both greater than 1.8.
In the first embodiment of the present invention, as can be calculated from table one, the field angle 2w of the optical lens is 44.8 degrees, and the relative aperture is 1.65.
In the first embodiment of the invention, the total length of the lens is 30.25mm, and the structure is compact.
Fig. 2 and 3 are graphs of Modulation Transfer Functions (MTF) of the visible and near infrared bands, respectively, representing the integrated resolving power of the optical system, where the horizontal axis represents spatial frequency in units: the number of turns per millimeter (cycles/mm), the longitudinal axis represents the numerical value of a Modulation Transfer Function (MTF), the numerical value of the MTF is used for evaluating the imaging quality of a lens, the value range is 0-1, particularly, the optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother the curve is, the better the imaging quality of the system is, and the stronger the restoring capability to a real image is; as can be seen from fig. 2 and 3, when the spatial frequency of the visible light band and the near infrared band is 160lp/mm, the MTF of the full field is greater than 0.3, and the optical lens provided in this specific implementation corrects various aberrations, such as spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification, positional chromatic aberration, and the like, so that the resolution is improved, and the performance of the lens can reach the resolution of 800 ten thousand pixels under white light.
As can be seen from fig. 2 and 3, the optical lens according to the embodiment of the present invention has corrected and balanced various aberrations to a good level.
Example two:
watch two
The effective focal length of the optical system provided by the first table is 11.245mm, the clear aperture is F/1.65, and the total length of the optical system is 30.25 mm. In table 2, mirror numbers 1 and 2 sequentially represent two mirror surfaces of the lens 1 in the light incident direction, mirror numbers 3 and 4 represent two mirror surfaces of the lens 2 in the light incident direction, mirror numbers 5 and 6 represent two mirror surfaces of the lens 3 in the light incident direction, mirror numbers 7 and 8 represent two mirror surfaces of the lens 4 in the light incident direction, mirror number 9 represents a mirror surface of the lens 5 facing the object, mirror number 10 represents a cemented surface of the lens 5 and the lens 6, mirror number 11 represents a mirror surface of the lens 6 facing the image side, mirror number 12 represents a mirror surface of the lens 7 facing the object side, mirror number 13 represents a cemented surface of the lens 7 and the lens 8, mirror number 14 represents a mirror surface of the lens 8 facing the image side, mirror number 15 represents a mirror surface of the lens 9 facing the object side, mirror number 16 represents a cemented surface of the lens 9 and the lens 10, mirror surface number 17 represents a bonding surface of the lens 10 and the lens 11, and mirror surface number 18 represents a mirror surface of the lens 11 facing the image side.
In practical implementation, in the second embodiment, the thickness of the diaphragm is 0.324mm, and the refractive index is 5.950; the thickness of the optical filter is 0.700mm, the refractive index is 1.517, and the Abbe constant is 64.212; the image plane has a thickness of 2.679 and a refractive index of 8.483.
In the second embodiment of the present invention, | f110.873/11.245 is 0.967, and satisfies 0.9 < | f1/f|＜1.5。
In the second embodiment of the present invention, | f29.600/11.245 is 0.854, and satisfies 0.8 < | f2/f|＜1.2。
In the second embodiment of the present invention, the abbe number of the third biconvex lens is 68.525, the abbe number of the fourth biconvex lens is 75.496, and the abbe number of the second meniscus lens is 68.525, which are all greater than 68.
In the second embodiment of the present invention, the refractive index of the first biconvex lens is 2.001, and the refractive index of the second biconvex lens is 2.051, which are both greater than 1.8.
In the second embodiment of the present invention, as can be calculated from table two, the field angle 2w of the optical lens is 44.8 degrees, and the relative aperture is 1.65.
In the second embodiment of the invention, the total length of the lens is 30.25mm, and the structure is compact.
Fig. 4 and 5 are graphs of Modulation Transfer Functions (MTF) of the visible and near infrared bands, respectively, representing the integrated resolving power of the optical system, where the horizontal axis represents spatial frequency in units: the number of turns per millimeter (cycles/mm), the longitudinal axis represents the numerical value of a Modulation Transfer Function (MTF), the numerical value of the MTF is used for evaluating the imaging quality of a lens, the value range is 0-1, particularly, the optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother the curve is, the better the imaging quality of the system is, and the stronger the restoring capability to a real image is; as can be seen from fig. 4 and 5, when the spatial frequency of the visible light band and the near infrared band is 160lp/mm, the MTF of the full field is greater than 0.3, and the optical lens provided by the present embodiment corrects various aberrations, such as spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification, chromatic aberration of position, and the like, so that the resolution is improved, and the performance of the lens can reach the resolution of 800 ten thousand pixels under white light.
As can be seen from fig. 4 and 5, the optical lens according to the embodiment of the present invention has corrected and balanced various aberrations to a good level.
In summary, the present invention discloses an optical lens, which sequentially includes, from an object side to an image side along an optical axis direction: the optical lens comprises a first meniscus lens with negative focal power, a first biconvex lens with positive focal power, a first biconcave lens with negative focal power, a second biconvex lens with positive focal power, a first cemented lens group with negative focal power, a second cemented lens group with negative focal power, a third cemented lens group with positive focal power, an optical filter and an image plane; the surface of the first meniscus lens 1 facing the object side is convex. Therefore, the optical lens formed by the lenses with the specific structural shapes and distributed by reasonable optical focal lengths can achieve tens of millions of pixel-level resolution under a compact framework. In addition, the optical lens of the embodiment of the invention also has lower cost due to simple structure. By adopting the structural shape of the optical lens system provided by the invention, parameters such as Abbe coefficients of optical glass materials are well matched with imaging conditions, so that spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and position chromatic aberration of the lens system are well corrected, the whole image surface can be uniformly imaged, and the day and night dual-purpose function can be realized; the use requirement of the 4K camera is met, the structure is compact, and the overall dimension is small. In addition, all optical lenses adopt a spherical surface design, the cold machining process performance of the lenses is good, the cost of glass materials is low, the price of finished lenses is also low, and the yield of mass production is high; but wide application in security protection control field.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. An optical lens comprising, in order from an object side to an image side in an optical axis direction: the optical lens comprises a first meniscus lens with negative focal power, a first biconvex lens with positive focal power, a first biconcave lens with negative focal power, a second biconvex lens with positive focal power, a first cemented lens group with negative focal power, a second cemented lens group with negative focal power, a third cemented lens group with positive focal power, an optical filter and an image plane; the surface of the first meniscus lens facing the object side is a convex surface;
the effective focal length of the first biconcave lens and the effective focal length of the optical lens meet a first set relationship, and the effective focal length of the second biconvex lens and the effective focal length of the optical lens meet a second set relationship;
wherein the first setting relationship is: 0.9 < | f1The/f | < 1.5, and the second setting relationship is as follows: 0.8 < | f2/f|＜1.2，f1Represents an effective focal length, f, of the first biconcave lens2Represents an effective focal length of the second biconvex lens, and f represents an effective focal length of the optical lens.
2. An optical lens as recited in claim 1, wherein the first cemented lens group includes:
a third biconvex lens with positive focal power;
a second biconcave lens having negative optical power;
the third biconvex lens and the second biconcave lens are seamlessly cemented to form a first cemented lens group.
3. An optical lens as recited in claim 2, wherein the second cemented lens group includes:
a third biconcave lens having negative optical power;
a fourth biconvex lens with positive focal power;
the third biconcave lens and the fourth biconvex lens are seamlessly cemented to form a second cemented lens group.
4. An optical lens as recited in claim 3, wherein the third cemented lens group includes:
a fifth biconvex lens with positive focal power;
a fourth biconcave lens having negative optical power;
a second meniscus lens having a positive refractive power; the surface of the second meniscus lens facing the object side is a convex surface;
the fifth biconvex lens, the fourth biconcave lens, and the second meniscus lens are seamlessly cemented to form a third cemented lens group.
5. An optical lens as claimed in claim 4, characterized in that the third biconvex lens, the fourth biconvex lens and the second meniscus lens each have an Abbe number greater than 65.
6. An optical lens as claimed in claim 1, characterized in that the relative aperture of the optical lens is 1.65.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
L/y<3.5
wherein: l denotes a total length of the optical lens, and y denotes a size of the image plane.
8. The optical lens of claim 4, wherein the refractive index of the first biconvex lens and the refractive index of the second biconvex lens are both greater than 1.8.
9. An optical lens according to any one of claims 1 to 8, wherein the optical lens further comprises an optical stop, the optical stop being located between the first cemented lens group and the second cemented lens group.
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| WO2022087890A1 (en) * | 2020-10-28 | 2022-05-05 | 欧菲光集团股份有限公司 | Optical imaging system, lens module and electronic device |
| CN115390224B (en) * | 2022-09-28 | 2024-03-15 | 福建福光股份有限公司 | Zero-temperature-drift multi-scene image detection optical system |
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| DE29819012U1 (en) * | 1998-10-27 | 1999-05-12 | EKOS Entwicklung und Konstruktion optischer Systeme GmbH, 12099 Berlin | Telephoto lens for a medium format camera |
| JP2000284172A (en) * | 1999-03-29 | 2000-10-13 | Fuji Photo Optical Co Ltd | Color image read lens |
| CN1920608A (en) * | 2006-09-11 | 2007-02-28 | 中国科学院上海技术物理研究所 | Ultraviolet object lens in aperture wide wave range for ultraviolet detection |
| CN202171678U (en) * | 2011-08-20 | 2012-03-21 | 福建福光数码科技有限公司 | High-resolution zoom lens for intelligent traffic system |
| JP2017058478A (en) * | 2015-09-15 | 2017-03-23 | 株式会社リコー | Image forming lens system and imaging apparatus and portable information terminal device |
| CN107656362A (en) * | 2017-11-08 | 2018-02-02 | 东莞市宇瞳光学科技股份有限公司 | The big multiplying power zoom lens of large aperture |
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2018
- 2018-03-27 CN CN201810259726.5A patent/CN108254881B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29819012U1 (en) * | 1998-10-27 | 1999-05-12 | EKOS Entwicklung und Konstruktion optischer Systeme GmbH, 12099 Berlin | Telephoto lens for a medium format camera |
| JP2000284172A (en) * | 1999-03-29 | 2000-10-13 | Fuji Photo Optical Co Ltd | Color image read lens |
| CN1920608A (en) * | 2006-09-11 | 2007-02-28 | 中国科学院上海技术物理研究所 | Ultraviolet object lens in aperture wide wave range for ultraviolet detection |
| CN202171678U (en) * | 2011-08-20 | 2012-03-21 | 福建福光数码科技有限公司 | High-resolution zoom lens for intelligent traffic system |
| JP2017058478A (en) * | 2015-09-15 | 2017-03-23 | 株式会社リコー | Image forming lens system and imaging apparatus and portable information terminal device |
| CN107656362A (en) * | 2017-11-08 | 2018-02-02 | 东莞市宇瞳光学科技股份有限公司 | The big multiplying power zoom lens of large aperture |
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| CN108254881A (en) | 2018-07-06 |
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