CN105527694B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN105527694B CN105527694B CN201510679740.7A CN201510679740A CN105527694B CN 105527694 B CN105527694 B CN 105527694B CN 201510679740 A CN201510679740 A CN 201510679740A CN 105527694 B CN105527694 B CN 105527694B
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more 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
- G02B13/001—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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
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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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- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
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Abstract
The invention provides an optical imaging lens, which comprises a first lens, a second lens and a third lens, wherein the first lens has negative focal power; a second lens, wherein the second lens has positive optical power; a third lens; a fourth lens, wherein the third lens and the fourth lens comprise an achromatic lens group; and a fifth lens, wherein the fifth lens has positive optical power, and the fifth lens has at least one aspheric surface.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens for optical imaging.
Background
The optical imaging system adopted by the existing indoor monitoring imaging system or vehicle-mounted imaging system, especially the front-mounted imaging system, is mostly refraction imaging. In actual imaging, an object image formed by refracting and imaging light emitted from one object point through an optical lens of the refractive imaging system is affected by various factors which may cause aberration, such as spherical aberration, coma aberration, astigmatism, curvature of field, distortion and the like.
In order to obtain an imaging effect with a large aperture, a high pixel, and a small distortion, an achromatic lens is required to help reduce chromatic aberration. Common achromatic lenses generally include two combined monolithic lenses of opposite chromatic properties, such as a cemented lens and a double-split lens. However, when the imaging optical system realizes imaging using only a single achromatic lens, it is difficult to reduce other factors affecting the imaging quality, and to realize good imaging using a single achromatic lens, it is necessary to use an ultra-low dispersion lens (ED lens) such as a lens made of fluorite. However, the fluorite has high processing difficulty, high production cost and environmental pollution in the production process. Furthermore, fluorite is brittle, rendering the entire optical lens unsuitable for use in complex and harsh environments.
In addition, with the development of active safety in the automotive industry, the requirements for vehicle-mounted front-view lenses are increasing. Small distortion, miniaturization, megapixels, large aperture lenses have been the requisite for such lenses. And the requirement is low cost, and the perfect imaging definition is kept in the temperature range of-40 ℃ to +85 ℃.
The wide-angle indoor monitoring and vehicle-mounted camera lens on the market at present cannot realize high-pixel, small-distortion and large-aperture imaging under the conditions of low cost and miniaturization.
Disclosure of Invention
The main object of the present invention is to provide a new optical lens, wherein each lens of the optical lens can be made of conventional optical manufacturing materials, such as glass or plastic, which is inexpensive to produce.
Another object of the present invention is to provide a new optical lens in which the manufacturing of the manufacturing material of each lens of the optical lens is more environmentally friendly.
Another object of the present invention is to provide a novel optical lens, in which an object image obtained by an imaging system using the optical lens has less curvature of field and distortion.
Another object of the present invention is to provide a novel optical lens in which each lens of the optical lens can be miniaturized.
Another object of the present invention is to provide a novel optical lens which is capable of achieving large aperture and high pixel definition imaging.
Another objective of the present invention is to provide a novel optical lens, wherein each lens of the optical lens can be made of glass material, so that the whole optical lens can clearly and stably image within a large temperature variation range, such as within a temperature range of-40 ℃ to 85 ℃.
Another object of the present invention is to further provide a novel optical lens, which can realize good imaging with large aperture, high pixel and small distortion by using light with a large wavelength range, thereby making it particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or illumination conditions.
Another object of the present invention is to further provide a novel optical lens, which can achieve good imaging with large aperture, high pixel and small distortion in a temperature range of-40 ℃ to 85 ℃ under the precondition of low cost and miniaturization.
Another object of the present invention is to provide a novel optical lens which does not require precise parts and complicated structures, and is simple in manufacturing process and low in cost.
Other objects and features of the present invention will become more fully apparent from the following detailed description and appended claims, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like parts throughout.
In accordance with the present invention, the foregoing and other objects and advantages can be achieved by the present invention comprising:
a first lens, wherein the first lens has a negative optical power;
a second lens, wherein the second lens has positive optical power;
a third lens;
a fourth lens, wherein the third lens and the fourth lens comprise an achromatic lens group; and
a fifth lens, wherein the fifth lens has positive optical power, wherein the fifth lens has two surfaces, and at least one of the two surfaces of the fifth lens is aspheric.
Another objective of the present invention is to provide an optical lens, which can achieve high pixel, small distortion and large aperture under the condition of meeting the requirements of low cost and miniaturization, and can still maintain perfect imaging within the temperature range of-40 ℃ to 85 ℃, and is particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or lighting conditions.
In order to achieve the purpose, the invention adopts the following technical scheme:
an optical lens comprising, in order from an object side to an image side: the lens comprises a front lens group with positive focal power, a diaphragm element and a rear lens group with positive focal power;
wherein the front lens group comprises in order from an object side to an image side: the lens comprises a first lens and a second lens, wherein the first lens is a biconcave lens with negative focal power, and the second lens is a biconvex lens with positive focal power; the rear lens group comprises the following components in sequence from an object side to an image side: the third lens and the fourth lens form a cemented lens, the fifth lens is an aspheric lens with positive focal power, and the shape of the fifth lens is a meniscus shape with two concave surfaces facing the same direction.
Wherein, the third lens in the cemented lens has positive focal power and is biconvex shape, the fourth lens in the cemented lens has negative focal power and is biconcave shape, and two concave surfaces of the fifth lens face to the object space.
Wherein, the third lens in the cemented lens has negative focal power and is biconcave, the fourth lens in the cemented lens has positive focal power and is biconvex, and two concave surfaces of the fifth lens face the image space.
Wherein the first lens satisfies the following formula:
Nd(1)≤1.8，Vd(1)≥40
where Nd (1) is a refractive index of the material of the first lens, and Vd (1) is an abbe constant of the material of the first lens.
Preferably, the first lens satisfies the following range:
Nd(1)≤1.65，Vd(1)≥55
wherein the first lens satisfies the following formula:
-0.9≥F1/F≥-2.0
where F1 is the focal length value of the first lens, and F denotes the entire set of focal length values of the optical lens.
Wherein the second lens satisfies the following formula:
Nd(2)≥1.73，Vd(2)≥40
where Nd (2) is a refractive index of the material of the second lens, and Vd (2) is an abbe constant of the material of the second lens.
Wherein the focal length of the front lens group, the focal length of the rear lens group and the whole set of focal length values of the optical lens satisfy the following formulas:
4.5 is more than or equal to F (front)/F is more than or equal to 1.3, 5 is more than or equal to F (rear)/F is more than or equal to 1.5,
further, 2.5 is more than or equal to F (front)/F is more than or equal to 1.3, 3 is more than or equal to F (rear)/F is more than or equal to 1.5
Wherein F (front) is a focal length value of the front lens group, F (rear) represents a focal length value of the rear lens group, and F represents a whole set of focal length values of the optical lens.
Wherein the fifth lens satisfies the following formula:
i r9-r 10I < 2, and F5/F > 2
Where r9 is a radius value of the fifth lens element in the object-side direction, r10 is a radius value of the fifth lens element in the image-side direction, F5 is a focal length value of the fifth lens element, and F denotes a focal length value of the entire group of the optical lens element.
Wherein the optical length of the optical lens satisfies the following conditions:
TTL/F is less than or equal to 6.5, and further,
TTL/F≤4.5
wherein, TTL represents an optical length of the optical lens, that is, a distance from an outermost point of an object side of a first lens of the optical lens to an imaging focal plane of the optical lens, and F represents a whole group focal length value of the optical lens;
the f-number FNO of the optical lens meets the following formula:
FNO≤1.8
the total field angle FOV of the optical lens satisfies the following formula:
80°≥FOV≥40°
the maximum clear aperture and the corresponding imaging image height of the first lens and the field angle of the optical lens meet the following formula:
D/h/FOV≤0.025
wherein, FOV represents the maximum field angle of the optical lens, d represents the maximum clear aperture of the concave surface of the first lens facing the object corresponding to the maximum FOV, and h represents the imaging image height corresponding to the maximum FOV.
The first lens, the second lens, the third lens and the fourth lens are all spherical glass lenses, and the fifth lens is a plastic aspheric lens.
The first lens, the second lens and the third lens are plastic aspheric lenses.
Has the advantages that:
the optical lens can realize high pixel, small distortion, large aperture and high light-passing performance, meet the requirement of high definition and effectively correct various aberrations of an optical system by adopting the design of 5 lens structures and aspheric lenses under the condition of meeting the requirements of low cost and miniaturization, can ensure that the perfect imaging definition is still kept in the temperature range of-40 ℃ to +85 ℃, and is particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or lighting conditions.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to a first preferred embodiment of the invention.
Fig. 2 is an MTF resolution curve of the optical lens according to the first preferred embodiment of the invention.
FIG. 3 is a astigmatic chart of the optical lens according to the first preferred embodiment of the present invention.
FIG. 4 is a distortion curve diagram of the optical lens according to the first preferred embodiment of the present invention.
FIG. 5 is a schematic structural diagram according to a second preferred embodiment of the present invention.
Fig. 6 is an MTF resolution curve of the optical lens according to the second preferred embodiment of the invention.
FIG. 7 is a astigmatic chart of an optical lens according to the second preferred embodiment of the present invention.
FIG. 8 is a distortion curve diagram of an optical lens according to the second preferred embodiment of the present invention.
Fig. 9 is a schematic structural diagram of an optical lens according to a third preferred embodiment of the invention.
Fig. 10 is an MTF resolution curve of the optical lens according to the third preferred embodiment of the invention.
FIG. 11 is a astigmatic chart of an optical lens according to the third preferred embodiment of the present invention.
FIG. 12 is a distortion curve diagram of an optical lens according to the third preferred embodiment of the present invention.
FIG. 13 is a schematic structural diagram according to a fourth preferred embodiment of the present invention.
Fig. 14 is an MTF resolution curve of the optical lens according to the fourth preferred embodiment of the invention.
FIG. 15 is an astigmatism graph of an optical lens system according to the fourth preferred embodiment of the invention.
FIG. 16 is a distortion curve diagram of an optical lens according to the fourth preferred embodiment of the present invention.
Wherein in fig. 1 to 16:
l1-first lens; l2-second lens; l3-third lens; l4-fourth lens; l5-fifth lens; l6-diaphragm elements; l7-color filters; l8-image plane; s1, S2-two sides of the first lens; s3, S4-two sides of the second lens; s5 — diaphragm element face; s6, S7-both sides of the third lens; s7, S8-both sides of the fourth lens; s9, S10-both sides of the fifth lens; s11, S12-both sides of the color filter.
Fig. 17 is a schematic structural diagram of an optical lens system according to a fifth preferred embodiment of the invention.
Fig. 18 is an MTF resolution curve of the optical lens according to the fifth preferred embodiment of the invention.
Fig. 19 is an astigmatism graph of the optical lens according to the fifth preferred embodiment of the invention.
FIG. 20 is a distortion curve diagram of an optical lens according to the fifth preferred embodiment of the present invention.
Fig. 21 is a schematic structural diagram of an optical lens system according to a sixth preferred embodiment of the invention.
Fig. 22 is an MTF resolution curve of the optical lens according to the sixth preferred embodiment of the invention.
Fig. 23 is an astigmatism graph of the optical lens system according to the sixth preferred embodiment of the invention.
FIG. 24 is a distortion curve diagram of an optical lens according to the sixth preferred embodiment of the present invention.
Fig. 25 is a schematic structural diagram of an optical lens system according to a seventh preferred embodiment of the invention.
Fig. 26 is an MTF resolution curve of the optical lens according to the seventh preferred embodiment of the invention.
Fig. 27 is an astigmatism graph of the optical lens according to the seventh preferred embodiment of the invention.
FIG. 28 is a distortion curve diagram of the optical lens system according to the seventh preferred embodiment of the present invention.
Fig. 29 is a schematic structural diagram of an optical lens system according to an eighth preferred embodiment of the invention.
Fig. 30 is an MTF resolution curve of the optical lens according to the eighth preferred embodiment of the invention.
Fig. 31 is an astigmatism graph of the optical lens system according to the eighth preferred embodiment of the invention.
FIG. 32 is a distortion curve diagram of an optical lens according to the eighth preferred embodiment of the present invention.
Fig. 33 is a schematic structural diagram of an optical lens system according to a ninth preferred embodiment of the invention.
Fig. 34 is an MTF resolution curve of the optical lens according to the ninth preferred embodiment of the invention.
Fig. 35 is an astigmatism graph of the optical lens according to the ninth preferred embodiment of the invention.
FIG. 36 is a distortion curve diagram of an optical lens according to the ninth preferred embodiment of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments provided in the following description are only intended as examples and modifications obvious to a person skilled in the art, and do not constitute a limitation to the scope of the invention. The general principles defined in the following description may be applied to other embodiments, alternatives, modifications, equivalent implementations, and applications without departing from the spirit and scope of the invention.
Referring to fig. 1 to 4 of the drawings of the present invention, an optical imaging lens according to a first preferred embodiment of the present invention is illustrated, wherein the optical imaging lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspheric surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the third lens L3 and/or the fourth lens L4 are aspherical mirrors. More preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical imaging lens system according to the first preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 1 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5. As shown in fig. 1 of the drawings, the front lens group may be formed of the first lens L1, the second lens L2, and the rear lens group is formed of the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1, the second lens L2, and the achromatic lens group and the fifth lens L5 of the front lens group are disposed in this order in an object-to-image direction.
As shown in fig. 1 of the drawings, the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical imaging lens according to the first preferred embodiment of the present invention are coaxial.
As shown in fig. 1 of the drawings, the optical imaging lens according to the first preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed at the achromatic lens group, such as at the third lens L3 or the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the double concave shape of the first lens L1 enables the optical imaging lens according to the first preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical imaging lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angle range to pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical imaging lens system according to the first preferred embodiment of the present invention is F, and then-0.9 ≧ F1/F ≧ 2, as shown in Table 1 and Table 2.
As shown in fig. 1 of the drawings, the first lens element L1 of the optical imaging lens system according to the first preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens element L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens element L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens element L2 face the object and the image, respectively. As shown in fig. 1 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 1 of the drawings, the third lens element L3 of the optical imaging lens system according to the first preferred embodiment of the present invention has two convex surfaces S6, S7, the fourth lens element L4 has two concave surfaces S7, S8, wherein the two convex surfaces S6, S7 of the third lens element L3 face the object and the image respectively, and the two concave surfaces S7, S8 of the fourth lens element L4 face the object and the image respectively, wherein the convex surface S7 of the third lens element L3 facing the image and the concave surface S7 of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the convex surface S7 of the third lens L3 and the concave surface S7 of the fourth lens coincide, so the surface S7 can be regarded as the convex surface S7 of the third lens L3 and can also be regarded as the concave surface S7 of the fourth lens L4. Accordingly, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical imaging lens system according to the first preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 1 of the drawings, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, and the fourth lens L4 is disposed such that its concave surface S7 faces the object side and the concave surface S8 faces the image side. Therefore, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconvex lens, and the fourth lens L4 is a biconcave lens. As shown in fig. 1 of the drawings, the fifth lens element L5 of the optical imaging lens system according to the first preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, two surfaces S9 and S10 of the fifth lens L5 are respectively a convex surface and a concave surface, for example, the surface S9 of the fifth lens L5 is a concave surface, and the surface S10 is a convex surface.
As shown in fig. 1 of the drawings, the achromatic lens group of the optical imaging lens according to the first preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the convex surface S7 of the third lens L3 and the concave surface S7 of the fourth lens L4 are overlapped together. At this time, the convex surface S7 of the third lens L3 and the concave surface S7 of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the first lens L1 of the optical imaging lens according to the first preferred embodiment of the present invention is set to have a refractive index Nd (1). ltoreq.1.8. Preferably, the refractive index Nd (1) ≦ 1.65 of the first lens L1 to avoid excessive divergence of the image light, as shown in Table 1. In other words, the refractive index of the material of the first lens L1 is not greater than 1.65, which is more effective. In addition, in order to avoid the overlarge aberration of the imaging light after passing through the first lens L1, the first lens L1 is made of a material with Abbe constant Vd (1) ≧ 40. Preferably, the first lens L1 is made of a material with Abbe's constant Vd (1) ≧ 55, as shown in Table 1. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.73, as shown in table 1. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.73. The abbe constant of the second lens L2 is Vd (2), and Vd (2) ≧ 40. Preferably, 65 ≧ Vd (2) ≧ 40 to effectively correct the imaged axial chromatic aberration, as shown in tables 1 and 2. Therefore, both the first lens L1 and the second lens L2 can be made of a relatively inexpensive glass material.
Fig. 1 of the accompanying drawings is a schematic structural diagram of an optical lens according to an embodiment of the present invention. As shown in fig. 1, fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present invention. As shown in fig. 1, an optical lens according to the present invention includes, in order from an object side to an image side: a front lens group having positive power, a diaphragm element L6, a rear lens group having positive power, a color filter L7, an image plane L8,
wherein the front lens group comprises in order from an object side to an image side: a first lens L1, a second lens L2, the first lens L1 being a biconcave lens having a negative optical power, the second lens L2 being a biconvex lens having a positive optical power; the rear lens group comprises the following components in sequence from an object side to an image side: the lens comprises a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the third lens L3 and the fourth lens L4 form a cemented lens, the fifth lens L5 is an aspheric lens with positive focal power, and the shape of the fifth lens L5 is that two concave surfaces face the same meniscus shape.
Preferably, the fifth lens L5 is a plastic aspheric lens. The fifth lens L5 is made of plastic, so that the weight of the optical lens can be reduced, and the cost can be reduced.
A third lens L3 of the cemented lenses has positive power and is biconvex in shape, a fourth lens L4 of the cemented lenses has negative power and is biconcave in shape, and both concave surfaces of the fifth lens L5 face the object.
In the present embodiment, the first lens L1 satisfies the following formula:
Nd(1)≤1.65，Vd(1)≥55
where Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the abbe constant of the material of the first lens L1. The lower refractive index can avoid the light from the object side from being too much dispersed after passing through a biconcave (or crescent) lens such as the fifth lens. Meanwhile, the first lens L1 satisfies the following formula:
-0.9≥F1/F≥-2.0
where F1 is a focal length value of the first lens L1, and F denotes a full set of focal length values of the optical lens. This makes it possible to balance the outer dimensions of the first lens L1 and the aberrations of the entire optical lens system.
In the present embodiment, the second lens L2 satisfies the following formula:
Nd(2)≥1.73，Vd(2)≥40
where Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the abbe constant of the material of the second lens L2. The second lens with high refractive index is used, so that light rays from an object side can be smoothly transited to the rear lens group, the large aperture performance of the optical lens is ensured, and the axial chromatic aberration of the optical lens system can be effectively corrected by Vd (2) being more than or equal to 40.
The focal length of the front lens group, the focal length of the rear lens group and the whole set of focal length values of the optical lens meet the following formula:
2.5 is more than or equal to F (front)/F is more than or equal to 1.3, 3 is more than or equal to F (rear)/F is more than or equal to 1.5
Wherein F (front) is a focal length value of the front lens group, F (rear) represents a focal length value of the rear lens group, and F represents a whole set of focal length values of the optical lens. By reasonably distributing the ratio of the focal power of the front lens group and the focal power of the rear lens group, on one hand, the effective aperture of the front end of the optical lens and the optical back focus of the optical lens can be effectively controlled; on the other hand, the high-grade aberration and distortion aberration of the optical lens system can be effectively eliminated.
In the present embodiment, the fifth lens L5 satisfies the following formula:
i r9-r 10I < 2, and F5/F > 2
Where r9 is a radius value of the fifth lens L5 in the object-side direction, r10 is a radius value of the fifth lens L5 in the image-side direction, F5 is a focal length value of the fifth lens L5, and F denotes a focal length value of the entire group of the optical lens. The last lens in the optical path of the optical lens, i.e. the fifth lens L5, is a lens close to a concentric circle and is aspheric, and the lens is controlled to have low focal power (long focal length), so that the light can be effectively and smoothly converged at the end, the aberration of the system is corrected, and the distortion of the lens is particularly controlled. Meanwhile, the lens is made into an aspheric surface, so that the problem that the traditional spherical concentric circle is difficult to process is solved.
The aspherical surface of the fifth lens L5 satisfies the following formula:
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is a high-order aspheric coefficient.
Further, the optical length of the optical lens satisfies the following condition:
TTL/F≤4.5
wherein TTL denotes an optical length of the optical lens, that is, a distance from an object side outermost point of the first lens L1 of the optical lens to an imaging focal plane of the optical lens, and F denotes a whole group focal length value of the optical lens;
the f-number FNO of the optical lens meets the following formula:
FNO≤1.8
the total field angle FOV of the optical lens satisfies the following formula:
80°≥FOV≥40°
the maximum clear aperture and the corresponding image height of the first lens L1 and the field angle of the optical lens satisfy the following formula:
D/h/FOV≤0.025
where FOV indicates the maximum field angle of the optical lens, d indicates the maximum clear aperture of the concave surface of the first lens L1 facing the object corresponding to the maximum FOV, and h indicates the imaging image height corresponding to the maximum FOV.
Preferably, the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are all spherical glass lenses, and the fifth lens L5 is a plastic aspheric lens.
Fig. 2-4 are graphs of optical performance for this example. Fig. 2 is an MTF resolution curve of the optical lens in fig. 1; FIG. 3 is a graph of astigmatism of the optical lens of FIG. 1, expressed in mm, for wavelengths of three colors of light in common use; fig. 4 is a distortion plot of the optical lens of fig. 1, showing normalized distortion magnitude values in% for different angles of view. As can be seen from fig. 2 to 4, it is demonstrated that the lens has better optical performance.
As shown in table 1 and table 2 below, in the present embodiment, the entire focal length of the optical lens is F, the aperture value is FNO, the field angle is FOV, the total lens length is TTL, F is 4.8mm, FNO is 1.8, FOV is 58 °, and TTL is 18.3 mm.
The two surfaces of the first lens are S1 and S2, the two surfaces of the second lens are S3 and S4, the surface of the diaphragm element is S5, the two surfaces of the third lens are S6 and S7, the two surfaces of the fourth lens are S7 and S8, the two surfaces of the fifth lens are S9 and S10, and the two surfaces of the color filter are S11 and S12; the S1-S12 correspond to the surface numbers in the following table, wherein IMA represents the image surface of the imaging surface L8.
Table 1 below shows parameters of the system of the optical lens of the present embodiment:
| number of noodles | Radius of curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd | Effective caliber D |
| 1 | -13.11 | 0.8 | 1.5168 | 64.17 | 6.21 |
| 2 | 4.08 | 2.91207 | 5.22 | ||
| 3 | 8.68 | 4.53 | 1.8040 | 46.57 | 5.54 |
| 4 | -8.99 | 0.3 | 4.73 | ||
| 5 | Infinity | -0.25 | 4.05 | ||
| 6 | 6.94 | 2.9 | 1.8040 | 46.57 | 4.05 |
| 7 | -4.2 | 0.6 | 1.8466 | 23.83 | 3.53 |
| 8 | 7.95 | 1.142021 | 3.33 | ||
| 9 | -3.9 | 1.8 | 1.5119 | 56.29 | 3.48 |
| 10 | -2.67 | 0.1 | 4.37 | ||
| 11 | Infinity | 0.55 | 1.5168 | 64.17 | 4.53 |
| 12 | Infinity | 3.168352 | 4.58 | ||
| IMA | Infinity | 5.10 |
Table 2 below lists the aspherical coefficients K, A, B, C, D, E:
from the above data, the numerical values of the formulas involved in the present embodiment are calculated as follows:
i r9-r10| ═ 1.23, F5/F ═ 2.35, F (before)/F ═ 1.84, F (after)/F ═ 2.4, TTL/F ═ 3.8, and D/h/FOV ═ 0.02. As shown in tables 1 and 2, in the present embodiment, as a specific set of exemplary parameters, the optical lens using the parameters can achieve better optical performance.
In summary, the optical lens of the present invention, through the design of the 5 lens structures and the aspheric lens, can achieve high pixel, small distortion, large aperture, high optical throughput, high resolution, and effective correction of various aberrations of the optical system under the condition of meeting the requirements of low cost and miniaturization, can ensure perfect imaging resolution within the temperature range of-40 ℃ to +85 ℃, and is particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or lighting conditions.
Referring to fig. 5 to 8 of the drawings of the present invention, an optical imaging lens according to a second preferred embodiment of the present invention is illustrated, wherein the optical imaging lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspheric surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the third lens L3 and/or the fourth lens L4 are aspherical mirrors. As shown in fig. 5, the first lens L1, the second lens L2 can be spherical glass lenses, and the third lens L3, the fourth lens L4 and the fifth lens L5 can be plastic aspherical lenses. More preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical imaging lens system according to the second preferred embodiment of the present invention.
Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 5 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5. As shown in fig. 5 of the drawings, the front lens group may be formed of the first lens L1 and the second lens L2, and the rear lens group may be formed of the third lens L3, the fourth lens L4 and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1, the second lens L2, and the achromatic lens group and the fifth lens L5 of the front lens group are disposed in this order in an object-to-image direction.
As shown in fig. 5 of the drawings, the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical imaging lens according to the second preferred embodiment of the present invention are coaxial.
As shown in fig. 5 of the drawings, the optical imaging lens system according to the second preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed at the achromatic lens group, such as at the third lens L3 or the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the double concave shape of the first lens L1 enables the optical imaging lens of the second preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical imaging lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angle range to pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical imaging lens system according to the second preferred embodiment of the present invention is F, so that-0.9 ≧ F1/F ≧ 2, as shown in Table 3 and Table 4.
As shown in fig. 5 of the drawings, the first lens L1 of the optical imaging lens according to the second preferred embodiment of the present invention has two concave surfaces S1 and S2, the second lens L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens L1 face the object and the image respectively, and the two convex surfaces S4 and S5 of the second lens L2 face the object and the image respectively. As shown in fig. 5 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 5 of the drawings, the third lens element L3 of the optical imaging lens system according to the second preferred embodiment of the present invention has two concave surfaces S6, S7, the fourth lens element L4 has two convex surfaces S7, S8, wherein the two concave surfaces S6, S7 of the third lens element L3 face the object and the image respectively, and the two convex surfaces S7, S8 of the fourth lens element L4 face the object and the image respectively, wherein the concave surface S7 of the third lens element L3 facing the image and the convex surface S7 of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the concave surface S7 of the third lens L3 and the convex surface S7 of the fourth lens coincide, so the surface S7 can be regarded as the concave surface S7 of the third lens L3 and can also be regarded as the convex surface S7 of the fourth lens L4. Accordingly, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical imaging lens system according to the second preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 5 of the drawings, the third lens L3 is disposed such that its concave surface S6 faces the object side and the concave surface S7 faces the image side, and the fourth lens L4 is disposed such that its convex surface S7 faces the object side and the convex surface S8 faces the image side. Therefore, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconcave lens, and the fourth lens L4 is a biconvex lens. As shown in fig. 5 of the drawings, the fifth lens element L5 of the optical imaging lens system according to the second preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, two surfaces S9 and S10 of the fifth lens L5 are respectively a convex surface and a concave surface, for example, the surface S9 of the fifth lens L5 is a convex surface, and the surface S10 is a concave surface.
As shown in fig. 5 of the drawings, the achromatic lens group of the optical imaging lens according to the second preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the concave surface S7 of the third lens L3 and the convex surface S7 of the fourth lens L4 are overlapped together. At this time, the concave surface S7 of the third lens L3 and the convex surface S7 of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index of the first lens L1 of the optical imaging lens according to the second preferred embodiment of the present invention is Nd (1), and Nd (1) ≦ 1.8. Preferably, the refractive index Nd (1). ltoreq.1.65 of the first lens L1 is set to avoid excessive divergence of the image light, as shown in tables 3 and 4. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.65. In addition, in order to avoid the overlarge aberration of the imaging light after passing through the first lens L1, the first lens L1 is made of a material with Abbe constant Vd (1) ≧ 40. Preferably, the first lens L1 is made of a material with Abbe's constant Vd (1) ≧ 55, as shown in Table 3. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.73, as shown in table 3. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.73. The second lens L2 is made of a material having an Abbe constant Vd (1) ≧ 40. Preferably, 40 ≦ Vd (2) ≦ 65 to effectively correct the imaged axial chromatic aberration, as shown in tables 3 and 4. Therefore, both the first lens L1 and the second lens L2 can be made of a relatively inexpensive glass material.
As shown in fig. 5 to 8 and tables 3 to 4 of the drawings, the present embodiment is different from the first preferred embodiment in that the cemented lens structure in the rear lens group is different and the two concave surfaces of the fifth lens L5 are oriented differently.
Fig. 5 of the accompanying drawings is a schematic structural diagram of another optical lens system according to an embodiment of the present invention. As shown in fig. 5, an optical lens according to the present invention sequentially includes, from an object side to an image side: a front lens group having positive power, a diaphragm element L6, a rear lens group having positive power, a color filter L7, an image plane L8;
wherein the front lens group comprises in order from an object side to an image side: a first lens L1, a second lens L2, the first lens L1 being a biconcave lens having a negative optical power, the second lens L2 being a biconvex lens having a positive optical power; the rear lens group comprises the following components in sequence from an object side to an image side: the lens comprises a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the third lens L3 and the fourth lens L4 form a cemented lens, the fifth lens L5 is an aspheric lens with positive focal power, and the shape of the fifth lens L5 is that two concave surfaces face the same meniscus shape.
Preferably, the fifth lens L5 is a plastic aspheric lens. The fifth lens L5 is made of plastic, so that the weight of the optical lens can be reduced, and the cost can be reduced.
A third lens L3 of the cemented lenses has a negative power and is biconcave, a fourth lens L4 of the cemented lenses has a positive power and is biconvex, and both concave surfaces of the fifth lens L5 face the image side.
In the present embodiment, the first lens L1 satisfies the following formula:
Nd(1)≤1.65，Vd(1)≥55
where Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the abbe constant of the material of the first lens L1. The lower refractive index can avoid the light from the object side from being too much dispersed after passing through a biconcave (or crescent) lens such as the fifth lens. The first lens L1 satisfies the following formula:
-0.9≥F1/F≥-2.0
where F1 is a focal length value of the first lens L1, and F denotes a full set of focal length values of the optical lens. This makes it possible to balance the outer dimensions of the first lens L1 and the aberrations of the entire optical lens system.
The second lens L2 satisfies the following formula:
Nd(2)≥1.73，Vd(2)≥40
where Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the abbe constant of the material of the second lens L2. The second lens with high refractive index is used, so that light rays from an object side can be smoothly transited to the rear lens group, the large aperture performance of the optical lens is ensured, and the axial chromatic aberration of the optical lens system can be effectively corrected by Vd (2) being more than or equal to 40.
The focal length of the front lens group, the focal length of the rear lens group and the whole set of focal length values of the optical lens meet the following formula:
2.5 is more than or equal to F (front)/F is more than or equal to 1.3, 3 is more than or equal to F (rear)/F is more than or equal to 1.5
Wherein F (front) is a focal length value of the front lens group, F (rear) represents a focal length value of the rear lens group, and F represents a whole set of focal length values of the optical lens. By reasonably distributing the ratio of the focal power of the front lens group and the focal power of the rear lens group, on one hand, the effective aperture of the front end of the optical lens and the optical back focus of the optical lens can be effectively controlled; on the other hand, the high-grade aberration and distortion aberration of the optical lens system can be effectively eliminated.
The fifth lens L5 satisfies the following equation:
i r9-r 10I < 2, and F5/F > 2
Where r9 is a radius value of the fifth lens L5 in the object-side direction, r10 is a radius value of the fifth lens L5 in the image-side direction, F5 is a focal length value of the fifth lens L5, and F denotes a focal length value of the entire group of the optical lens. The last lens in the optical path of the optical lens, i.e. the fifth lens L5, is a lens close to a concentric circle and is aspheric, and the lens is controlled to have low focal power (long focal length), so that the light can be effectively and smoothly converged at the end, the aberration of the system is corrected, and the distortion of the lens is particularly controlled. Meanwhile, the lens is made into an aspheric surface, so that the problem that the traditional spherical concentric circle is difficult to process is solved.
The aspherical surface of the fifth lens L5 satisfies the following formula:
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is a high-order aspheric coefficient.
The optical length of the optical lens meets the following conditions:
TTL/F≤4.5
wherein TTL denotes an optical length of the optical lens, that is, a distance from an object side outermost point of the first lens L1 of the optical lens to an imaging focal plane of the optical lens, and F denotes a whole group focal length value of the optical lens;
the f-number FNO of the optical lens meets the following formula:
FNO≤1.8
the total field angle FOV of the optical lens satisfies the following formula:
80°≥FOV≥40°
the maximum clear aperture and the corresponding image height of the first lens L1 and the field angle of the optical lens satisfy the following formula:
D/h/FOV≤0.025
where FOV indicates the maximum field angle of the optical lens, d indicates the maximum clear aperture of the concave surface of the first lens L1 facing the object corresponding to the maximum FOV, and h indicates the imaging image height corresponding to the maximum FOV.
Preferably, the first lens L1 and the second lens L2 are spherical glass lenses, and the third lens L3, the fourth lens L4 and the fifth lens L5 are plastic aspherical lenses.
Fig. 6-8 are graphs of the optical performance of this example. Fig. 6 is an MTF resolution curve of the optical lens in fig. 5; FIG. 7 is a graph of astigmatism of the optical lens of FIG. 5, expressed in mm, for wavelengths of three colors of light in common use; fig. 8 is a distortion plot of the optical lens of fig. 5, showing normalized distortion magnitude values in% for different angles of view. As can be seen from fig. 6 to 8, it is demonstrated that the lens has better optical performance.
As shown in tables 3 and 4 below, in the present embodiment, the entire group focal length value of the optical lens is F, the aperture value is FNO, the field angle is FOV, the total lens length is TTL, F is 4.68mm, FNO is 1.8, FOV is 58 °, and TTL is 19.87 mm.
Note that, the two surfaces of the first lens are S1, S2, the two surfaces of the second lens are S3, S4, the surface of the diaphragm element is S5, the two surfaces of the third lens are S6, S7, the two surfaces of the fourth lens are S7, S8, the two surfaces of the fifth lens are S9, S10, the two surfaces of the color filter are S11, S12, and S1-S12 correspond to the surface numbers in the following table one by one, where IMA represents the image plane of the imaging plane L8.
Table 3 below shows parameters of the system of the optical lens of the present embodiment:
| number of noodles | Radius of curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd | Effective caliber D |
| 1 | -19.3808 | 1.0 | 1.5168 | 64.20 | 6 |
| 2 | 4.2627 | 3.713 | 5.95 | ||
| 3 | 6.3101 | 2.8 | 1.8040 | 46.57 | 5.95 |
| 4 | -21.6038 | 2.2805 | 5.95 | ||
| 5 | Infinity | 0.5165 | 3.26 | ||
| 6 | -4.5564 | 0.6 | 1.5825 | 30.15 | 3.32 |
| 7 | 2.0801 | 2.1673 | 1.5343 | 55.31 | 4.44 |
| 8 | -3.1304 | 0.1 | 4.74 | ||
| 9 | 5.2512 | 2.8 | 1.5116 | 56.82 | 4.94 |
| 10 | 6.2999 | 0.5 | 4.7 | ||
| 11 | Infinity | 0.55 | 1.5168 | 64.17 | 4.8 |
| 12 | Infinity | 2.8377 | 4.8 | ||
| IMA | Infinity | 4.8 |
Table 4 below sets forth the aspherical coefficients K, A, B, C, D, E:
from the above data, the numerical values of the formulas involved in the present embodiment are calculated as follows:
i r9-r10| ═ 1, F5/F ═ 7, F (before)/F ═ 1.63, F (after)/F ═ 2.08, TTL/F ═ 4.2, and D/h/FOV ═ 0.022.
As shown in tables 3 and 4, in the present embodiment, as a specific set of exemplary parameters, the optical lens using the parameters can achieve better optical performance.
In summary, the optical lens of the present invention, through the design of the 5 lens structures and the aspheric lens, can achieve high pixel, small distortion, large aperture, high optical throughput, high resolution, and effective correction of various aberrations of the optical system under the condition of meeting the requirements of low cost and miniaturization, can ensure perfect imaging resolution within the temperature range of-40 ℃ to +85 ℃, and is particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or lighting conditions.
Referring to fig. 9 to 12 of the drawings of the present invention, an optical imaging lens according to a third preferred embodiment of the present invention is illustrated, wherein the optical imaging lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspheric surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical imaging lens system according to the third preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 9 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5. As shown in fig. 9 of the drawings, the front lens group may be formed of the first lens L1, the second lens L2, and the rear lens group is formed of the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group, the second lens L2 of the rear lens group, and the achromatic lens group and the fifth lens L5 are disposed in this order from the object side to the image side.
As shown in fig. 9 of the drawings, the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical imaging lens according to the third preferred embodiment of the present invention are coaxial.
As shown in fig. 9 of the drawings, the optical imaging lens system according to the third preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3, as shown in fig. 9 of the drawings.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed at the achromatic lens group, such as at the third lens L3 or the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the biconcave shape of the first lens L1 allows the optical imaging lens of the third preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical imaging lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angle range to pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical imaging lens system according to the third preferred embodiment of the present invention is F, so that-0.9 ≧ F1/F ≧ 2, as shown in Table 5 and Table 6.
As shown in fig. 9 of the drawings, the first lens L1 of the optical imaging lens system according to the third preferred embodiment of the present invention has two concave surfaces S1 and S2, the second lens L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens L1 face the object and the image respectively, and the two convex surfaces S4 and S5 of the second lens L2 face the object and the image respectively. As shown in fig. 9 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 9 of the drawings, the third lens element L3 of the optical imaging lens system according to the third preferred embodiment of the present invention has two convex surfaces S6, S7, the fourth lens element L4 has two concave surfaces S7, S8, wherein the two convex surfaces S6, S7 of the third lens element L3 face the object and the image respectively, and the two concave surfaces S7, S8 of the fourth lens element L4 face the object and the image respectively, wherein the convex surface S7 of the third lens element L3 facing the image and the concave surface S7 of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the convex surface S7 of the third lens L3 and the concave surface S7 of the fourth lens coincide, so the surface S7 can be regarded as the convex surface S7 of the third lens L3 and can also be regarded as the concave surface S7 of the fourth lens L4. Accordingly, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical imaging lens system according to the third preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 9 of the drawings, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, and the fourth lens L4 is disposed such that its concave surface S7 faces the object side and the concave surface S8 faces the image side. Therefore, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconvex lens, and the fourth lens L4 is a biconcave lens. As shown in fig. 9 of the drawings, the fifth lens element L5 of the optical imaging lens system according to the third preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, two surfaces S9 and S10 of the fifth lens L5 are respectively a convex surface and a concave surface, for example, the surface S9 of the fifth lens L5 is a concave surface, and the surface S10 is a convex surface.
As shown in fig. 9 of the drawings, the achromatic lens group of the optical imaging lens according to the third preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the convex surface S7 of the third lens L3 and the concave surface S7 of the fourth lens L4 are overlapped together. At this time, the convex surface S7 of the third lens L3 and the concave surface S7 of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical imaging lens according to the third preferred embodiment of the present invention is less than or equal to 1.80 to avoid the image light from being too divergent, as shown in Table 5. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.8. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, the Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in Table 5. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.73, as shown in tables 5 and 6. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.73. In addition, the second lens L2 has an Abbe constant Vd (2), and Vd (2) ≧ 40. Preferably, Vd (2) is 40 ≦ 65 for effectively correcting the axial chromatic aberration of the image as shown in tables 5 and 6. Therefore, both the first lens L1 and the second lens L2 can be made of a relatively inexpensive glass material.
As shown in fig. 9 to 12 and tables 5 to 6 of the drawings, the present embodiment is different from the first preferred embodiment of the present invention in that specific parameters of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5, in particular, the first lens L1, are different in the present embodiment. So that the first lens L1 can be made of materials having different properties.
As shown in fig. 9 to 12 and tables 5 to 6 of the drawings, an optical lens according to a third preferred embodiment of the present invention includes, in order from an object side to an image side: a front lens group having positive power, a diaphragm element L6, a rear lens group having positive power, a color filter L7, an image plane L8;
wherein the front lens group comprises in order from an object side to an image side: a first lens L1, a second lens L2, the first lens L1 being a biconcave lens having a negative optical power, the second lens L2 being a biconvex lens having a positive optical power; the rear lens group comprises the following components in sequence from an object side to an image side: the lens comprises a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the third lens L3 and the fourth lens L4 form a cemented lens, the fifth lens L5 is an aspheric lens with positive focal power, and the shape of the fifth lens L5 is that two concave surfaces face the same meniscus shape.
Preferably, the fifth lens L5 is a plastic aspheric lens. The fifth lens L5 is made of plastic, so that the weight of the optical lens can be reduced, and the cost can be reduced.
A third lens L3 of the cemented lenses has positive power and is biconvex in shape, a fourth lens L4 of the cemented lenses has negative power and is biconcave in shape, and both concave surfaces of the fifth lens L5 face the object.
In the present embodiment, the first lens L1 satisfies the following formula:
Nd(1)≤1.8，Vd(1)≥40
where Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the abbe constant of the material of the first lens L1. The lower refractive index can avoid the light from the object side from being too much dispersed after passing through a biconcave (or crescent) lens such as the fifth lens. Meanwhile, the first lens L1 satisfies the following formula:
-0.9≥F1/F≥-2.0
where F1 is a focal length value of the first lens L1, and F denotes a full set of focal length values of the optical lens. This makes it possible to balance the outer dimensions of the first lens L1 and the aberrations of the entire optical lens system.
In the present embodiment, the second lens L2 satisfies the following formula:
Nd(2)≥1.73，Vd(2)≥40
where Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the abbe constant of the material of the second lens L2. The second lens with high refractive index is used, so that light rays from an object side can be smoothly transited to the rear lens group, the large aperture performance of the optical lens is ensured, and the axial chromatic aberration of the optical lens system can be effectively corrected by Vd (2) being more than or equal to 40.
The focal length of the front lens group, the focal length of the rear lens group and the whole set of focal length values of the optical lens meet the following formula:
2.5 is more than or equal to F (front)/F is more than or equal to 1.3, 3 is more than or equal to F (rear)/F is more than or equal to 1.5
Wherein F (front) is a focal length value of the front lens group, F (rear) represents a focal length value of the rear lens group, and F represents a whole set of focal length values of the optical lens. By reasonably distributing the ratio of the focal power of the front lens group and the focal power of the rear lens group, on one hand, the effective aperture of the front end of the optical lens and the optical back focus of the optical lens can be effectively controlled; on the other hand, the high-grade aberration and distortion aberration of the optical lens system can be effectively eliminated.
The aspherical surface of the fifth lens L5 satisfies the following formula:
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is a high-order aspheric coefficient.
Preferably, the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are all spherical glass lenses, and the fifth lens L5 is a plastic aspheric lens.
Fig. 10-12 are graphs of the optical performance of this embodiment. Fig. 10 is an MTF resolution curve of the optical lens in fig. 9; FIG. 11 is a graph of astigmatism for the optical lens of FIG. 9, expressed in mm, for wavelengths of three colors of light commonly used; fig. 12 is a distortion plot of the optical lens of fig. 9, showing normalized distortion magnitude values in% for different angles of view. As can be seen from fig. 10 to 12, it is demonstrated that the lens has better optical performance.
As shown in tables 5 and 6 below, in the present embodiment, the entire focal length of the optical lens is F, the aperture value is FNO, the field angle is FOV, the total lens length is TTL, F is 3.9mm, FNO is 2.0, FOV is 60 °, and TTL is 17.94 mm.
The two surfaces of the first lens are S1 and S2, the two surfaces of the second lens are S3 and S4, the surface of the diaphragm element is S5, the two surfaces of the third lens are S6 and S7, the two surfaces of the fourth lens are S7 and S8, the two surfaces of the fifth lens are S9 and S10, and the two surfaces of the color filter are S11 and S12; the S1-S12 correspond to the surface numbers in the following table, wherein IMA represents the image surface of the imaging surface L8.
As shown in tables 5 and 6 below, the optical lens system according to the third preferred embodiment of the present invention can be configured such that the curvature radius of the concave surface S1 facing the object of the first lens L1 is-48.335 (from the object to the image), the curvature radius of the concave surface S2 facing the image of the first lens L1 is 3.717 (from the object to the image), the refractive index of the first lens L1 is 1.71, and the abbe constant of the first lens L1 is 53.8; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 5.950 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-7.570 (from the object to the image), the refractive index of the second lens element L2 is 1.80, and the abbe constant of the second lens element L2 is 46.6, the MTF resolving curve of the optical lens according to the third preferred embodiment of the present invention is as shown in fig. 10, the astigmatism curve of the optical lens is as shown in fig. 11, and the distortion curve of the optical lens is as shown in fig. 12. Therefore, the optical lens has good optical performance, as shown in fig. 10 to 12 of the drawings.
The following table 5 shows parameters of the system of the optical lens of the present embodiment:
| number of noodles | Radius of curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd |
| 1 | -48.335 | 0.800 | 1.71 | 53.8 |
| 2 | 3.717 | 2.750 | ||
| 3 | 5.950 | 4.460 | 1.80 | 46.6 |
| 4 | -7.570 | 0.904 | ||
| STO | Infinity | -0.250 | ||
| 6 | 5.682 | 2.930 | 1.80 | 46.6 |
| 7 | -4.370 | 0.600 | 1.85 | 23.8 |
| 8 | 5.241 | 1.103 | ||
| 9 | -6.368 | 1.750 | 1.51 | 56.3 |
| 10 | -2.564 | 0.100 | ||
| 11 | Infinity | 0.950 | 1.52 | 64.2 |
| 12 | Infinity | 1.839 | ||
| IMA | Infinity |
The aspheric coefficients K, A, B, C, D, E are listed in table 6 below:
| number of noodles | K | A | B | | D | E | |
| 9 | 5.133 | -1.60000E-03 | 9.70883E-04 | -2.96888E-04 | -5.85596E-05 | 3.68100E-06 | |
| 10 | -3.2 | 2.04873E-03 | -1.39479E-03 | 4.74043E-04 | -7.24495E-05 | 6.32194E-06 |
At least one of both surfaces of the fifth lens L5 is aspheric to improve the overall resolution and imaging performance of the optical lens, so that the optical lens according to the third preferred embodiment of the present invention is suitable for being miniaturized and has better imaging performance.
As shown in tables 5 and 6, in the present embodiment, as a specific set of exemplary parameters, the optical lens using the parameters can achieve better optical performance.
In summary, the optical lens according to the third preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens system according to the third preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens system can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the third preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range.
Therefore, the optical lens according to the third preferred embodiment of the present invention can be configured to adopt a 5-lens structure and an aspheric lens design, so as to achieve high pixel, small distortion, large aperture, high light-passing performance, high definition requirement compliance and effective correction of various aberrations of the optical system under the condition of meeting the requirements of low cost and miniaturization, ensure perfect imaging definition within the temperature range of-40 ℃ to +85 ℃, and be particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or lighting conditions.
Referring to fig. 13 to 16 of the drawings of the present application, an optical imaging lens according to a fourth preferred embodiment of the present invention is illustrated, wherein the optical imaging lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, wherein the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive refractive power, and the fifth lens L5 has at least one aspheric surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical imaging lens system according to the fourth preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 13 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5. As shown in fig. 13 of the drawings, the front lens group may be formed of the first lens L1, the second lens L2, and the rear lens group is formed of the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group and the second lens L2 of the rear lens group, the achromatic lens group, and the fifth lens L5 are disposed in this order in a direction from an object side to an image side.
As shown in fig. 13 of the drawings, the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical imaging lens according to the fourth preferred embodiment of the present invention are coaxial.
As shown in fig. 13 of the drawings, the optical imaging lens system according to the fourth preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed at the achromatic lens group, such as at the third lens L3 or the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the biconcave shape of the first lens L1 enables the optical imaging lens according to the fourth preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical imaging lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angle range to pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical imaging lens system according to the fourth preferred embodiment of the present invention is F, so that-0.9 ≧ F1/F ≧ 2, as shown in Table 7 and Table 8.
As shown in fig. 13 of the drawings, the first lens L1 of the optical imaging lens system according to the fourth preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens L2 face the object and the image, respectively. As shown in fig. 13 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 13 of the drawings, the third lens element L3 of the optical imaging lens system according to the fourth preferred embodiment of the present invention has two concave surfaces S6, S7, the fourth lens element L4 has two convex surfaces S7, S8, wherein the two concave surfaces S6, S7 of the third lens element L3 face the object and the image respectively, and the two convex surfaces S7, S8 of the fourth lens element L4 face the object and the image respectively, wherein the concave surface S7 of the third lens element L3 facing the image and the convex surface S7 of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the concave surface S7 of the third lens L3 and the convex surface S7 of the fourth lens coincide, so the surface S7 can be regarded as the concave surface S7 of the third lens L3 and can also be regarded as the convex surface S7 of the fourth lens L4. Accordingly, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical imaging lens system according to the fourth preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 13, the third lens L3 is disposed such that its concave surface S6 faces the object side and the concave surface S7 faces the image side, and the fourth lens L4 is disposed such that its convex surface S7 faces the object side and the convex surface S8 faces the image side. Therefore, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconcave lens, and the fourth lens L4 is a biconvex lens. As shown in fig. 13 of the drawings, the fifth lens element L5 of the optical imaging lens system according to the fourth preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, two surfaces S9 and S10 of the fifth lens L5 are respectively a convex surface and a concave surface, for example, the surface S9 of the fifth lens L5 is a convex surface, and the surface S10 is a concave surface. As shown in fig. 13 of the drawings, the achromatic lens group of the optical imaging lens according to the fourth preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the concave surface S7 of the third lens L3 and the convex surface S7 of the fourth lens L4 are overlapped together. At this time, the concave surface S7 of the third lens L3 and the convex surface S7 of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical imaging lens according to the fourth preferred embodiment of the present invention is smaller than or equal to 1.8, so as to avoid the image light from being too divergent, as shown in Table 7 and Table 8. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.8. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, the Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in tables 7 and 8. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.73, as shown in tables 7 and 8. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.73. In addition, the second lens L2 is set to have an Abbe constant Vd (2), Vd (2) ≧ 40 to effectively correct the axial chromatic aberration of imaging, as shown in Table 7 and Table 8. Therefore, both the first lens L1 and the second lens L2 can be made of a relatively inexpensive glass material.
As shown in fig. 13 to 16, and tables 7 and 8 of the drawings, this embodiment is different from the first preferred embodiment in that the cemented lens structure in the rear lens group is different, and the two concave surfaces of the fifth lens L5 are oriented differently.
Fig. 13 of the accompanying drawings is a schematic structural diagram of another optical lens system according to an embodiment of the present invention. As shown in fig. 13, an optical lens according to the present invention includes, in order from an object side to an image side: a front lens group having positive power, a diaphragm element L6, a rear lens group having positive power, a color filter L7, an image plane L8;
wherein the front lens group comprises in order from an object side to an image side: a first lens L1, a second lens L2, the first lens L1 being a biconcave lens having a negative optical power, the second lens L2 being a biconvex lens having a positive optical power; the rear lens group comprises the following components in sequence from an object side to an image side: the lens comprises a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the third lens L3 and the fourth lens L4 form a cemented lens, the fifth lens L5 is an aspheric lens with positive focal power, and the shape of the fifth lens L5 is that two concave surfaces face the same meniscus shape.
Preferably, the fifth lens L5 is a plastic aspheric lens. The fifth lens L5 is made of plastic, so that the weight of the optical lens can be reduced, and the cost can be reduced.
A third lens L3 of the cemented lenses has a negative power and is biconcave, a fourth lens L4 of the cemented lenses has a positive power and is biconvex, and both concave surfaces of the fifth lens L5 face the image side.
In the present embodiment, the first lens L1 satisfies the following formula:
Nd(1)≤1.8，Vd(1)≥40
where Nd (1) is the refractive index of the material of the first lens L1, and Vd (1) is the abbe constant of the material of the first lens L1. The lower refractive index can avoid the light from the object side from being too much dispersed after passing through a biconcave (or crescent) lens such as the fifth lens. The first lens L1 satisfies the following formula:
-0.9≥F1/F≥-2.0
where F1 is a focal length value of the first lens L1, and F denotes a full set of focal length values of the optical lens. This makes it possible to balance the outer dimensions of the first lens L1 and the aberrations of the entire optical lens system.
The second lens L2 satisfies the following formula:
Nd(2)≥1.73，Vd(2)≥40
where Nd (2) is the refractive index of the material of the second lens L2, and Vd (2) is the abbe constant of the material of the second lens L2. The second lens with high refractive index is used, so that light rays from an object side can be smoothly transited to the rear lens group, the large aperture performance of the optical lens is ensured, and the axial chromatic aberration of the optical lens system can be effectively corrected by Vd (2) being more than or equal to 40.
The aspherical surface of the fifth lens L5 satisfies the following formula:
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is a high-order aspheric coefficient.
Preferably, the first lens L1 and the second lens L2 are spherical glass lenses, and the third lens L3, the fourth lens L4 and the fifth lens L5 are plastic aspherical lenses.
Fig. 14-16 are graphs of optical performance for this example. Wherein, fig. 14 is an MTF resolution curve of the optical lens in fig. 13; FIG. 15 is a graph of astigmatism for the optical lens of FIG. 13, expressed in mm, for the wavelengths of three colors of light commonly used; fig. 16 is a distortion plot of the optical lens of fig. 13, showing normalized distortion magnitude values in% for different angles of view. As can be seen from fig. 14 to 16, it is demonstrated that the lens has better optical performance.
Note that, the two surfaces of the first lens are S1, S2, the two surfaces of the second lens are S3, S4, the surface of the diaphragm element is S5, the two surfaces of the third lens are S6, S7, the two surfaces of the fourth lens are S7, S8, the two surfaces of the fifth lens are S9, S10, the two surfaces of the color filter are S11, S12, and S1-S12 correspond to the surface numbers in the following table one by one, where IMA represents the image plane of the imaging plane L8.
As shown in tables 7 and 8 below, the optical lens system according to the fourth preferred embodiment of the present invention can be configured such that the curvature radius of the concave surface S1 facing the object of the first lens L1 is-19.457 (from the object to the image), the curvature radius of the concave surface S2 facing the image of the first lens L1 is 4.280 (from the object to the image), the refractive index of the first lens L1 is 1.75, and the abbe constant of the first lens L1 is 52.3; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 6.313 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-21.612 (from the object to the image), the refractive index of the second lens element L2 is 1.80, and the abbe constant of the second lens element L2 is 46.57, the MTF solution curve of the optical lens according to the fourth preferred embodiment of the present invention is shown in fig. 14, the astigmatism curve of the optical lens is shown in fig. 15, and the distortion curve of the optical lens is shown in fig. 16. Therefore, the optical lens has good optical performance, as shown in fig. 13 to 16 of the drawings.
Table 7 below is the parameters of the system of the optical lens of example 4:
| number of noodles | Radius of curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd |
| 1 | -19.457 | 1.004 | 1.75 | 52.3 |
| 2 | 4.280 | 2.713 | ||
| 3 | 6.313 | 2.801 | 1.80 | 46.57 |
| 4 | -21.612 | 2.281 | ||
| STO | Infinity | 0.514 | ||
| 6 | -4.577 | 0.603 | 1.84 | 42.7 |
| 7 | 4.088 | 2.176 | 1.75 | 52.3 |
| 8 | -3.143 | 0.100 | ||
| 9 | 5.278 | 2.814 | 1.51 | 56.82 |
| 10 | 6.332 | 1.000 | ||
| 11 | Infinity | 0.701 | 1.52 | 64.17 |
| 12 | Infinity | 2.358 | ||
| IMA | Infinity |
Table 8 below sets forth the aspherical coefficients K, A, B, C, D, E:
| number of noodles | K | A | B | | D | E | |
| 6 | 1.894298 | -6.07712E-03 | 2.52228E-03 | -1.25428E-03 | 4.39495E-04 | -6.63308E-05 | |
| 7 | -7.61499 | 3.19178E-02 | -1.13368E-02 | 1.49418E-03 | 1.18261E-04 | -3.21623E-05 | |
| 8 | -0.11792 | 3.33277E-03 | -4.44728E-04 | 6.98934E-05 | 4.45825E-06 | -2.57041E-07 | |
| 9 | 0.517756 | -7.46451E-04 | 2.59083E-04 | 1.69566E-06 | -6.36868E-06 | 1.22806E-07 | |
| 10 | 4.531809 | -9.35661E-03 | 3.86409E-04 | -3.18205E-05 | 3.95945E-06 | -2.08549E-06 |
Preferably, at least one of the two surfaces of the fifth lens element L5 is aspheric to improve the overall resolution and imaging performance of the optical lens, and the first lens element L1 and the second lens element L2 are spherical glass lenses, and the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are plastic aspheric lenses, as shown in tables 7 and 8.
Thereby making the optical lens according to the fourth preferred embodiment of the present invention suitable for being miniaturized and having better imaging performance.
As shown in tables 7 and 8, in the fourth preferred embodiment, as a specific set of exemplary parameters, the optical lens using the parameters can achieve better optical performance.
In summary, the optical lens according to the fourth preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens system according to the fourth preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens system can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the fourth preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range.
Therefore, the optical lens according to the fourth preferred embodiment of the present invention can be configured to adopt a 5-lens structure and an aspheric lens design, so as to achieve high pixel, small distortion, large aperture, high light-passing performance, high definition requirement compliance and effective correction of various aberrations of the optical system under the condition of meeting the requirements of low cost and miniaturization, ensure perfect imaging definition within the temperature range of-40 ℃ to +85 ℃, and be particularly suitable for monitoring and vehicle-mounted camera systems with poor day and night or lighting conditions.
Referring to fig. 17 to 20 of the drawings, an optical lens according to a fifth preferred embodiment of the present invention is illustrated, wherein the optical lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspherical surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical lens system according to the fifth preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 17 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5. As shown in fig. 17 of the drawings, the front lens group may be formed of the first lens L1, and the rear lens group is formed of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group and the second lens L2 of the rear lens group, the achromatic lens group, and the fifth lens L5 are disposed in this order in a direction from an object side to an image side.
As shown in fig. 17 of the drawings, the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical lens according to the fifth preferred embodiment of the present invention are coaxial.
As shown in fig. 17 of the drawings, the optical lens assembly according to the fifth preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2, as shown in fig. 17 of the drawings. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed at the achromatic lens group, such as at the third lens L3 or the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the biconcave shape of the first lens L1 allows the optical lens of the fifth preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angular range to enter the first lens L1 and pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical lens system according to the fifth preferred embodiment of the present invention is F, so that-0.5 ≧ F1/F ≧ 2, as shown in Table 1A and Table 2A.
As shown in fig. 17 of the drawings, the first lens element L1 of the optical lens system according to the fifth preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens element L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens element L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens element L2 face the object and the image, respectively. As shown in fig. 17, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 17 of the drawings, further, the third lens element L3 of the optical lens system according to the fifth preferred embodiment of the present invention has two convex surfaces S6, S7, the fourth lens element L4 has a concave surface S7 ' and a convex surface S8, wherein the two convex surfaces S6, S7 of the third lens element L3 face the object and the image respectively, the concave surface S7 ' of the fourth lens element L4 faces the object, the convex surface S8 of the fourth lens element L4 faces the image, and the convex surface S7 of the third lens element L3 facing the image and the concave surface S7 ' of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical lens system according to the fifth preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 17, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, the fourth lens L4 is disposed such that its concave surface S7' faces the object side and the convex surface S8 faces the image side. Thus, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconvex lens, and the fourth lens L4 is meniscus-shaped. As shown in fig. 17 of the drawings, the fifth lens element L5 of the optical lens system according to the fifth preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, both surfaces S9, S10 of the fifth lens L5 are convex. Alternatively, one of the two surfaces S9, S10 of the fifth lens L5 is convex and the other is flat.
As shown in fig. 17 of the drawings, the achromatic lens group of the optical lens according to the fifth preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are overlapped together. At this time, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical lens according to the fifth preferred embodiment of the present invention is less than or equal to 1.85, so as to avoid the image light from being too divergent, as shown in Table 1A and Table 2A. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.85. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, the Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in tables 1A and 2A. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.55, preferably, Nd (2) ≧ 1.7, as shown in table 1A and table 2A. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.55. Further, the second lens L2 is set to have an Abbe constant Vd (2), Vd (2) 20 ≦ 65 to effectively correct the axial chromatic aberration of the imaged image, as shown in Table 1A and Table 2A.
Meanwhile, since the refractive index Nd (1) of the first lens L1 is equal to or less than 1.85, and the Abbe constant Vd (1) is equal to or more than 40, and the refractive index Nd (2) of the second lens L2 is equal to or more than 1.55, preferably, Nd (2) is equal to or more than 1.7, and the Abbe constant 20 is equal to or less than Vd (2) is equal to or less than 65, both the first lens L1 and the second lens L2 can be made of cheaper glass materials.
Therefore, the front lens group and the rear lens group of the optical lens according to the fifth preferred embodiment of the present invention are disposed such that a ratio of the total track length TTL of the optical lens to the focal length F of the optical lens satisfies: TTL/F is less than or equal to 7.5, wherein the total length TTL of the optical lens is the distance from the object-oriented concave surface of the first lens L1 to the image plane.
As shown in tables 1A and 2A below, an optical lens according to the fifth preferred embodiment of the present invention can be configured such that the concave surface S1 of the first lens L1 facing the object has a radius of curvature of-7.693 (from the object side to the image side), the concave surface S2 of the first lens L1 facing the image side has a radius of curvature of 4.290 (from the object side to the image side), the refractive index of the first lens L1 is 1.68, and the abbe constant of the first lens L1 is 54.9; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 9.074 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-9.148 (from the object to the image), the refractive index of the second lens element L2 is 1.77, and the abbe constant of the second lens element L2 is 49.6, the MTF resolving curve of the optical lens according to the fifth preferred embodiment of the present invention is shown in fig. 18, the astigmatism curve of the optical lens is shown in fig. 19, and the distortion curve of the optical lens is shown in fig. 20. Therefore, the optical lens has good optical performance, as shown in fig. 18 to 20 of the drawings.
Table 1A: parameters of each lens of optical lens
| Number of noodles | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -7.693 | 0.800 | 1.68 | 54.9 |
| S2 | 4.290 | 2.752 | ||
| STO | Infinity | 0.000 | ||
| S4 | 9.074 | 4.000 | 1.77 | 49.6 |
| S5 | -9.148 | 0.300 | ||
| S6 | 11.160 | 4.000 | 1.5 | 81.6 |
| S7 | -6.766 | 0.800 | ||
| S7′ | -6.766 | 0.800 | 1.78 | 25.7 |
| S8 | -28.694 | 0.180 | ||
| S9 | 7.092 | 2.200 | 1.51 | 63.8 |
| S10 | -20.000 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.860 | ||
| IMA | Infinity |
Table 2A: parameters of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.68 | 54.9 | 1.77 | 49.6 | -3.94 | 3.79 | 21.34 | -1.04 | 5.63 |
Optionally, the fifth lens L5 has at least one aspheric surface, and the aspheric surface satisfies the following formula:
where z (h) is a distance vector from a vertex of the aspheric surface when the aspheric surface has a height h along the optical axis, c is 1/r, r represents a curvature radius of the aspheric surface mirror surface, k is a conic coefficient, A, B, C, D, E is a high-order aspheric coefficient, and the above formula relates to the following parameters in table 3A:
TABLE 3A
| Surf | K | A | B | | D | E | |
| 9 | 1.772565 | -7.84760E-04 | 2.03208E-04 | -4.79963E-05 | 7.10422E-06 | -4.01297E-07 | |
| 10 | -5.511378 | 7.11871E-04 | 3.82934E-04 | -1.03112E-04 | 1.32688E-05 | -7.36120E-07 |
In other words, at least one of the two convex surfaces of the fifth lens element L5 is aspheric to improve the image resolution and forming performance of the optical lens, so that the optical lens according to the fifth preferred embodiment of the present invention is suitable for being miniaturized and has better image forming performance.
In summary, the optical lens according to the fifth preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens system according to the fifth preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens system can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the fifth preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range.
Referring to fig. 21 to 24 of the drawings of the present invention, an optical lens according to a sixth preferred embodiment of the present invention is illustrated, wherein the optical lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspherical surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical lens system according to the sixth preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 21 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5.
As shown in fig. 21 of the drawings, the front lens group may be formed of the first lens L1, and the rear lens group is formed of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group and the second lens L2 of the rear lens group, the achromatic lens group, and the fifth lens L5 are disposed in this order in a direction from an object side to an image side. As shown in fig. 21 of the drawings, optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical lens according to the sixth preferred embodiment of the present invention are coaxial.
As shown in fig. 21 of the drawings, the optical lens assembly according to the sixth preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2, as shown in fig. 17 of the drawings. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
It is understood that the double concave shape of the first lens L1 enables the optical lens according to the sixth preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angular range to enter the first lens L1 and pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Furthermore, the focal length of the first lens element L1 is F1, and the focal length of the optical lens system according to the sixth preferred embodiment of the present invention is F, so that-0.5 ≧ F1/F ≧ 2, as shown in FIG. 20 and FIG. 21.
As shown in fig. 21 of the drawings, the first lens element L1 of the optical lens system according to the sixth preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens element L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens element L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens element L2 face the object and the image, respectively. As shown in fig. 21 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 21 of the drawings, the third lens element L3 of the optical lens system according to the sixth preferred embodiment of the present invention has two convex surfaces S6 and S7, the fourth lens element L4 has a concave surface S7 ' and a convex surface S8, the fifth lens element L5 has a convex surface S9, wherein the two convex surfaces S6 and S7 of the third lens element L3 face the object and the image respectively, the concave surface S7 ' of the fourth lens element L4 faces the object, the convex surface S8 of the fourth lens element L4 faces the image, and the convex surface S7 of the third lens element L3 facing the image and the concave surface S7 ' of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical lens system according to the sixth preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 21 of the drawings, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, and the fourth lens L4 is disposed such that its concave surface S7' faces the object side and the convex surface S8 faces the image side. Thus, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconvex lens, and the fourth lens L4 is meniscus-shaped. As shown in fig. 21 of the drawings, the fifth lens element L5 of the optical lens system according to the sixth preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, both surfaces S9, S10 of the fifth lens L5 are convex. Alternatively, one of the two surfaces S9, S10 of the fifth lens L5 is convex and the other is flat.
As shown in fig. 21 of the drawings, the achromatic lens group of the optical lens according to the sixth preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are overlapped together. At this time, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
As shown in fig. 21 of the drawings, the achromatic lens group of the optical lens according to the sixth preferred embodiment of the present invention is a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. Alternatively, the achromatic lens group may be a double separation type achromatic lens group.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical lens according to the sixth preferred embodiment of the present invention is smaller than or equal to 1.85, so as to avoid the image light from being too divergent, as shown in FIG. 20 and FIG. 21. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.85. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, the Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in FIGS. 20 and 21. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.55, preferably, Nd (2) ≧ 1.7, as shown in fig. 20 and 21. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.55. Further, the second lens L2 is set to have an Abbe constant Vd (2), Vd (2) 20 ≦ 65 to effectively correct the axial chromatic aberration of the imaging light, as shown in FIGS. 20 and 21.
Meanwhile, the refractive index Nd (1) of the first lens L1 is less than or equal to 1.85, the Abbe constant Vd (1) is more than or equal to 40, the refractive index Nd (2) of the second lens L2 is more than or equal to 1.55, preferably, Nd (2) is more than or equal to 1.7, and the Abbe constant 20 is less than or equal to Vd (2) is less than or equal to 65, so that both the first lens L1 and the second lens L2 can be made of cheaper glass materials.
Therefore, the front lens group and the rear lens group of the optical lens system according to the sixth preferred embodiment of the present invention are disposed such that a ratio of a total track length TTL of the optical lens system to a focal length F of the optical lens system satisfies: TTL/F is less than or equal to 7.5, wherein the total length TTL of the optical lens is the distance from the object-oriented concave surface of the first lens L1 to the image plane.
As shown in fig. 20 and 21, an optical lens system according to a sixth preferred embodiment of the present invention can be configured such that the concave surface S1 of the first lens L1 facing the object has a radius of curvature of-15.021 (from the object side to the image side), the concave surface S2 of the first lens L1 facing the image side has a radius of curvature of 3.590 (from the object side to the image side), the refractive index of the first lens L1 is 1.77, and the abbe number of the first lens L1 is 49.6; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 11.646 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-7.686 (from the object to the image), the refractive index of the second lens element L2 is 1.75, and the abbe constant of the second lens element L2 is 52.3, the MTF solution curve of the optical lens according to the sixth preferred embodiment of the present invention is shown in fig. 22, the astigmatism curve of the optical lens is shown in fig. 23, and the distortion curve of the optical lens is shown in fig. 24. Therefore, the optical lens has good optical performance as shown in fig. 22 to 24 of the drawings.
Table 4A: parameters of each lens of optical lens
| Number of noodles | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -15.021 | 0.800 | 1.77 | 49.6 |
| S2 | 3.590 | 3.062 | ||
| STO | Infinity | 0.000 | ||
| S4 | 11.646 | 4.800 | 1.75 | 52.3 |
| S5 | -7.686 | 0.300 | ||
| S6 | 10.744 | 4.600 | 1.59 | 61.6 |
| S7 | -4.697 | 0.650 | ||
| S7′ | -4.697 | 0.650 | 1.78 | 25.7 |
| S8 | -54.135 | 0.180 | ||
| S9 | 6.880 | 2.200 | 1.51 | 63.8 |
| S10 | -16.627 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.620 | ||
| IMA | Infinity |
Table 5A: parameters of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.77 | 49.6 | 1.75 | 52.3 | -3.66 | 3.25 | 22.66 | -1.13 | 6.96 |
Optionally, the fifth lens L5 has at least one aspheric surface, and the aspheric surface satisfies the following formula:
where z (h) is a distance vector from a vertex of the aspheric surface when the aspheric surface has a height h along the optical axis, c is 1/r, r represents a curvature radius of the aspheric surface mirror surface, k is a conic coefficient, A, B, C, D, E is a high-order aspheric coefficient, and the above formula relates to the following parameters in table 6A:
TABLE 6A
| Surf | K | A | B | | D | E | |
| 9 | 2.13737 | -6.14534E-04 | 2.77319E-04 | -6.04441E-05 | 5.28979E-06 | -3.07681E-07 | |
| 10 | -145.2098 | 5.80617E-03 | 4.65256E-04 | -9.58216E-05 | 1.27880E-05 | -5.53983E-07 |
In other words, at least one of the two convex surfaces of the fifth lens element L5 is aspheric to improve the image resolution and forming performance of the optical lens, so that the optical lens according to the sixth preferred embodiment of the present invention is suitable for being miniaturized and has better image forming performance.
In summary, the optical lens according to the sixth preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens system according to the sixth preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens system can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the sixth preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range.
Referring to fig. 25 to 28 of the drawings of the present invention, an optical lens according to a seventh preferred embodiment of the present invention is illustrated, wherein the optical lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspherical surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical lens system according to the seventh preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 25 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5.
As shown in fig. 25 of the drawings, the front lens group may be formed of the first lens L1, and the rear lens group is formed of the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group and the second lens L2 of the rear lens group, the achromatic lens group, and the fifth lens L5 are disposed in this order in a direction from an object side to an image side.
As shown in fig. 25 of the drawings, the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical lens according to the seventh preferred embodiment of the present invention are coaxial.
As shown in fig. 25 of the drawings, the optical lens assembly according to the seventh preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop L6, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2, as shown in fig. 25 of the drawings. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed at the achromatic lens group, such as at the third lens L3 or the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group. It is understood that the biconcave shape of the first lens L1 allows the optical lens of the seventh preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angular range to enter the first lens L1 and pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical lens system according to the seventh preferred embodiment of the present invention is F, so that-0.5 ≧ F1/F ≧ 2, as shown in Table 7A and Table 8A.
As shown in fig. 25 of the drawings, the first lens element L1 of the optical lens system according to the seventh preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens element L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens element L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens element L2 face the object and the image, respectively. As shown in fig. 25 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 25 of the drawings, the third lens element L3 of the optical lens system according to the seventh preferred embodiment of the present invention has two convex surfaces S6, S7, the fourth lens element L4 has a concave surface S7 ' and a convex surface S8, wherein the two convex surfaces S6, S7 of the third lens element L3 face the object and the image respectively, the concave surface S7 ' of the fourth lens element L4 faces the object, the convex surface S8 of the fourth lens element L4 faces the image, and the convex surface S7 of the third lens element L3 facing the image and the concave surface S7 ' of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical lens system according to the seventh preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 25 of the drawings, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, and the fourth lens L4 is disposed such that its concave surface S7' faces the object side and the convex surface S8 faces the image side. Thus, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconvex lens, and the fourth lens L4 is meniscus-shaped. As shown in fig. 25 of the drawings, the fifth lens element L5 of the optical lens system according to the seventh preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, both surfaces S9, S10 of the fifth lens L5 are convex. Alternatively, one of the two surfaces S9, S10 of the fifth lens L5 is convex and the other is flat.
As shown in fig. 25 of the drawings, the achromatic lens group of the optical lens according to the seventh preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are overlapped together. At this time, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
As shown in fig. 25 of the drawings, the achromatic lens group of the optical lens according to the seventh preferred embodiment of the present invention is a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. Alternatively, the achromatic lens group may be a double separation type achromatic lens group.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical lens according to the seventh preferred embodiment of the present invention is smaller than or equal to 1.85, so as to avoid the image light from being too much divergent, as shown in tables 7A and 8A. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.85. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, the Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in tables 7A and 8A. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.55, preferably, Nd (2) ≧ 1.7, as shown in table 7A and table 8A. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.55. Further, the second lens L2 is set to have an Abbe constant Vd (2), Vd (2) 20 ≦ 65 to effectively correct the axial chromatic aberration of the imaging light, as shown in tables 7A and 8A.
Meanwhile, the refractive index Nd (1) of the first lens L1 is less than or equal to 1.85, the Abbe constant Vd (1) is more than or equal to 40, the refractive index Nd (2) of the second lens L2 is more than or equal to 1.55, preferably, Nd (2) is more than or equal to 1.7, and the Abbe constant 20 is less than or equal to Vd (2) is less than or equal to 65, so that both the first lens L1 and the second lens L2 can be made of cheaper glass materials.
Therefore, the front lens group and the rear lens group of the optical lens system according to the seventh preferred embodiment of the present invention are disposed such that a ratio of a total track length TTL of the optical lens system to a focal length F of the optical lens system satisfies: TTL/F is less than or equal to 7.5, wherein the total length TTL of the optical lens is the distance from the object-oriented concave surface of the first lens L1 to the image plane.
As shown in tables 7A and 8A below, an optical lens according to the seventh preferred embodiment of the present invention can be configured such that the concave surface S1 of the first lens L1 facing the object has a radius of curvature of-9.622 (from the object side to the image side), the concave surface S2 of the first lens L1 facing the image side has a radius of curvature of 3.940 (from the object side to the image side), the refractive index of the first lens L1 is 1.84, and the abbe constant of the first lens L1 is 42.7; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 10.331 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-7.412 (from the object to the image), the refractive index of the second lens element L2 is 1.80, and the abbe constant of the second lens element L2 is 46.6, the MTF resolving curve of the optical lens according to the seventh preferred embodiment of the present invention is as shown in fig. 26, the astigmatism curve of the optical lens is as shown in fig. 27, and the distortion curve of the optical lens is as shown in fig. 28. Therefore, the optical lens has good optical performance, as shown in fig. 26 to 28 of the drawings.
Table 7A: parameters of each lens of optical lens
| Number of noodles | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -9.622 | 0.800 | 1.84 | 42.7 |
| S2 | 3.940 | 2.111 | ||
| STO | Infinity | 0.000 | ||
| S4 | 10.331 | 4.500 | 1.80 | 46.6 |
| S5 | -7.412 | 0.300 | ||
| S6 | 8.198 | 4.800 | 1.50 | 81.6 |
| S7 | -4.430 | 0.650 | ||
| S7′ | -4.430 | 0.650 | 1.78 | 25.7 |
| S8 | -50.970 | 0.180 | ||
| S9 | 6.891 | 2.200 | 1.62 | 60.3 |
| S10 | -17.281 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.052 | ||
| IMA | Infinity |
Table 8A: parameters of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.84 | 42.7 | 1.8 | 46.6 | -3.24 | 3.56 | 21.04 | -0.91 | 5.91 |
Optionally, the fifth lens L5 has at least one aspheric surface, and the aspheric surface satisfies the following formula:
where z (h) is a distance vector from a vertex of the aspheric surface when the aspheric surface has a height h along the optical axis, c is 1/r, r represents a curvature radius of the aspheric surface mirror surface, k is a conic coefficient, A, B, C, D, E is a high-order aspheric coefficient, and the parameters related to the above formula are as follows in table 9A:
TABLE 9A
| Surf | K | A | B | | D | E | |
| 9 | 2.076894 | -6.25822E-04 | 4.99231E-04 | -1.33350E-04 | 1.61843E-05 | -6.49550E-07 | |
| 10 | -100.2098 | 3.44509E-04 | -1.27920E-05 | 1.56858E-05 | -7.10819E-07 | 1.15656E-07 |
In other words, at least one of the two convex surfaces of the fifth lens element L5 is aspheric to improve the image resolution and forming performance of the optical lens, so that the optical lens according to the seventh preferred embodiment of the present invention is suitable for being miniaturized and has better image forming performance.
In summary, the optical lens according to the seventh preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens system according to the seventh preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens system can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the seventh preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range.
Referring to fig. 29 to 32 of the drawings of the present invention, an optical lens according to an eighth preferred embodiment of the present invention is illustrated, wherein the optical lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspherical surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical lens system according to the eighth preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 29 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5.
As shown in fig. 29 of the drawings, the front lens group may be formed of the first lens L1, and the rear lens group is formed of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group and the second lens L2 of the rear lens group, the achromatic lens group, and the fifth lens L5 are disposed in this order in a direction from an object side to an image side.
As shown in fig. 29 of the drawings, optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical lens according to the eighth preferred embodiment of the present invention are coaxial.
As shown in fig. 29 of the drawings, the optical lens assembly according to the eighth preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2, as shown in fig. 29 of the drawings. More preferably, the stop L6 is disposed between the second lens L2 and L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Further, the stop L6 may also be disposed in the achromatic lens group, such as between the third lens L3 and the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the biconcave shape of the first lens L1 allows the optical lens of the eighth preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angular range to enter the first lens L1 and pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical lens system according to the eighth preferred embodiment of the present invention is F, so that-0.5 ≧ F1/F ≧ 2, as shown in Table 10A and Table 11A.
As shown in fig. 29 of the drawings, the first lens element L1 of the optical lens system according to the eighth preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens element L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens element L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens element L2 face the object and the image, respectively. As shown in fig. 29 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side.
As shown in fig. 29 of the drawings, the third lens element L3 of the optical lens system according to the eighth preferred embodiment of the present invention has a convex surface S6 and a concave surface S7, the fourth lens element L4 has two convex surfaces S7 ' and S8, wherein the convex surface S6 of the third lens element L3 faces the object, the concave surface S7 of the third lens element L3 faces the image, the convex surface S7 ' of the fourth lens element L4 faces the object, the convex surface S8 of the fourth lens element L4 faces the image, and the concave surface S7 of the third lens element L3 facing the image and the convex surface S7 ' of the fourth lens element L4 facing the object are disposed opposite to each other. In other words, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical lens system according to the eighth preferred embodiment of the present invention are all double-sided lens elements, wherein the third lens element L3 is meniscus-shaped. As shown in fig. 29, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, the fourth lens L4 is disposed such that its convex surface S7' faces the object side and the convex surface S8 faces the image side. Thus, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a meniscus lens, and the fourth lens L4 has a biconvex lens. As shown in fig. 29 of the drawings, the fifth lens element L5 of the optical lens system according to the fifth preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, both surfaces S9, S10 of the fifth lens L5 are convex. Alternatively, one of the two surfaces S9, S10 of the fifth lens L5 is convex and the other is flat.
As shown in fig. 29 of the drawings, the achromatic lens group of the optical lens according to the eighth preferred embodiment of the present invention is preferably a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the concave surface S7 of the third lens L3 and the convex surface S7' of the fourth lens L4 are overlapped together. At this time, the concave surface S7 of the third lens L3 and the convex surface S7' of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
As shown in fig. 29 of the drawings, the achromatic lens group of the optical lens according to the eighth preferred embodiment of the present invention is a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. Alternatively, the achromatic lens group may be a double separation type achromatic lens group.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical lens according to the eighth preferred embodiment of the present invention is smaller than or equal to 1.85, so as to avoid the image light from being too much divergent, as shown in tables 10A and 11A. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.85. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, the Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in tables 10A and 11A. In order to converge the imaging light passing through the first lens L1 and suppress further divergence of the imaging light so that the imaging light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.55, preferably, Nd (2) ≧ 1.7, as shown in table 10A and table 11A. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.55. Further, the second lens L2 is set to have an Abbe constant Vd (2), Vd (2) 20 ≦ 65 to effectively correct the axial chromatic aberration of the imaging light, as shown in tables 10A and 11A.
Meanwhile, the refractive index Nd (1) of the first lens L1 is less than or equal to 1.85, the Abbe constant Vd (1) is more than or equal to 40, the refractive index Nd (2) of the second lens L2 is more than or equal to 1.55, and the Abbe constant 20 is less than or equal to Vd (2) is less than or equal to 65, so that the first lens L1 and the second lens L2 can both be made of cheaper glass materials.
Therefore, the front lens group and the rear lens group of the optical lens according to the eighth preferred embodiment of the present invention are disposed such that a ratio of a total track length TTL of the optical lens to a focal length F of the optical lens satisfies: TTL/F is less than or equal to 7.5, wherein the total length TTL of the optical lens is the distance from the object-oriented concave surface of the first lens L1 to the image plane.
As shown in tables 10A and 11A below, an optical lens according to the eighth preferred embodiment of the present invention can be configured such that the concave surface S1 facing the object of the first lens L1 has a radius of curvature of-6.255 (from the object to the image), the concave surface S2 facing the image of the first lens L1 has a radius of curvature of 4.004 (from the object to the image), the refractive index of the first lens L1 is 1.70, and the abbe constant of the first lens L1 is 55.5; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 6.831 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-12.690 (from the object to the image), the refractive index of the second lens element L2 is 1.80, and the abbe constant of the second lens element L2 is 46.6, the MTF resolving curve of the optical lens according to the eighth preferred embodiment of the present invention is as shown in fig. 30, the astigmatism curve of the optical lens is as shown in fig. 31, and the distortion curve of the optical lens is as shown in fig. 32. Therefore, the optical lens has good optical performance, as shown in fig. 30 to 32 of the drawings.
Table 10A: parameters of each lens of optical lens
| Number of noodles | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -6.255 | 0.800 | 1.70 | 55.5 |
| S2 | 4.004 | 1.633 | ||
| STO | Infinity | 0.000 | ||
| S4 | 6.831 | 3.800 | 1.80 | 46.6 |
| S5 | -12.690 | 0.300 | ||
| S6 | 5.860 | 0.650 | 1.78 | 25.7 |
| S7 | 3.070 | 2.400 | ||
| S7′ | 3.070 | 2.400 | 1.50 | 81.6 |
| S8 | -8.319 | 0.807 | ||
| S9 | 21.403 | 1.500 | 1.51 | 63.8 |
| S10 | -29.443 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 4.837 | ||
| IMA | Infinity |
Table 11A: parameters of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.7 | 55.5 | 1.8 | 46.6 | -3.38 | 4.40 | 18.18 | -0.77 | 4.13 |
Optionally, the fifth lens L5 has at least one aspheric surface, and the aspheric surface satisfies the following formula:
where z (h) is a distance vector from a vertex of the aspheric surface when the aspheric surface has a height h along the optical axis, c is 1/r, r represents a curvature radius of the aspheric surface mirror surface, k is a conic coefficient, A, B, C, D, E is a high-order aspheric coefficient, and the above formula relates to the following parameters in table 12A:
TABLE 12A
| Surf | K | A | B | C | D | E |
| 9 | -48.00451 | -5.33681E-03 | 8.77024E-05 | -1.02961E-04 | 1.11426E-05 | -5.61961E-07 |
| 10 | -100 | -5.22017E-03 | 2.55546E-05 | -8.01754E-05 | 1.09726E-05 | -6.66770E-07 |
In other words, at least one of the two convex surfaces of the fifth lens element L5 is aspheric to improve the image resolution and forming performance of the optical lens, so that the optical lens according to the eighth preferred embodiment of the present invention is suitable for being miniaturized and has better image forming performance.
In summary, the optical lens according to the eighth preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens according to the eighth preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the eighth preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range.
Referring to fig. 33 to 36 of the drawings of the present invention, an optical lens according to a ninth preferred embodiment of the present invention is illustrated, wherein the optical lens includes at least one first lens L1, at least one second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, wherein the first lens L1 has negative power, the second lens L2 has positive power, the third lens L3 and the fourth lens L4 constitute an achromatic lens group, the fifth lens L5 has positive power, and the fifth lens L5 has at least one aspherical surface. In other words, the fifth lens L5 is an aspherical mirror. Preferably, the first lens element L1, the second lens element L2, the third lens element L3 and/or the fourth lens element L4 are aspheric lenses to improve the optical performance of the optical lens system according to the ninth preferred embodiment of the present invention. Optionally, the first lens L1, the second lens L2, the third lens L3 and/or the fourth lens L4 are spherical mirrors.
As shown in fig. 33 of the drawings, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens L1, and the rear lens group includes at least the third lens L3, the fourth lens L4 and the fifth lens L5, wherein the front lens group and the rear lens group are sequentially disposed in an object-to-image direction. In other words, the front lens group can be formed by the first lens L1, and can also be formed by the first lens L1 and the second lens L2, wherein when the front lens group is formed by the first lens L1, the rear lens group includes the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5; when the front lens group is formed of the first lens L1 and the second lens L2, the rear lens group includes the third lens L3, the fourth lens L4, and the fifth lens L5.
As shown in fig. 33 of the drawings, the front lens group may be formed of the first lens L1, and the rear lens group is formed of the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5. Preferably, the front lens group and the rear lens group are disposed in order in a direction from an object side to an image side. More preferably, the first lens L1 of the front lens group and the second lens L2 of the rear lens group, the achromatic lens group, and the fifth lens L5 are disposed in this order in a direction from an object side to an image side.
As shown in fig. 33 of the drawings, optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 of the optical lens according to the ninth preferred embodiment of the present invention are coaxial.
As shown in fig. 33 of the drawings, the optical lens assembly according to the ninth preferred embodiment of the present invention further includes a stop L6, wherein the front lens group and the rear lens group can be disposed on two sides of the stop, respectively, and wherein the optical center of the stop L6 is coaxial with the optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5. Preferably, the stop L6 is disposed between the first lens L1 and the second lens L2, as shown in fig. 33 of the drawings. Optionally, the stop L6 is disposed between the second lens L2 and the third lens L3.
Optionally, the stop L6 is disposed in the rear lens group, and an optical center of the stop L6 is coaxial with optical centers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In some embodiments, the stop L6 may also be disposed between the achromatic lens group and the fifth lens L5. Alternatively, the stop L6 may also be disposed in the achromatic lens group, such as between the third lens L3 and the fourth lens L4. In other embodiments, the stop L6 is disposed between the front lens group and the rear lens group.
It is understood that the biconcave shape of the first lens L1 allows the optical lens of the ninth preferred embodiment of the present invention to have a larger aperture, which is beneficial to reduce the front lens diameter of the optical lens, thereby satisfying the miniaturization requirement and reducing the cost. In particular, when the stop L6 is disposed between the first lens L1 and the second lens L2, the double concave shape of the first lens L1 allows imaging light in a larger angular range to enter the first lens L1 and pass through the stop L6. Meanwhile, the second lens L2 has positive power, so as to facilitate converging the light rays diverging forwardly (referring to the light rays emitted from the first lens L1), thereby facilitating the correction of aberration.
Further, the focal length of the first lens element L1 is F1, and the focal length of the optical lens system according to the ninth preferred embodiment of the present invention is F, so that-0.5 ≧ F1/F ≧ 2, as shown in Table 13A and Table 14A.
As shown in fig. 33 of the drawings, the first lens element L1 of the optical lens system according to the ninth preferred embodiment of the present invention has two concave surfaces S1 and S2, and the second lens element L2 has two convex surfaces S4 and S5, wherein the two concave surfaces S1 and S2 of the first lens element L1 face the object and the image, respectively, and the two convex surfaces S4 and S5 of the second lens element L2 face the object and the image, respectively. As shown in fig. 33 of the drawings, the first lens L1 is disposed such that its concave surface S1 faces the object side and the concave surface S2 faces the image side, and the second lens L2 is disposed such that its convex surface S4 faces the object side and the convex surface S5 faces the image side. As shown in fig. 33 of the drawings, the third lens L3 of the optical lens system according to the ninth preferred embodiment of the present invention has two convex surfaces S6, S7, the fourth lens L4 has two concave surfaces S7 ', S8, wherein the two convex surfaces S6, S7 of the third lens L3 face the object and the image respectively, the concave surface S7 ' of the fourth lens L4 faces the object, the concave surface S8 of the fourth lens L4 faces the image, and the convex surface S7 of the third lens L3 facing the image and the concave surface S7 ' of the fourth lens L4 facing the object are disposed opposite to each other. In other words, the first lens element L1, the second lens element L2, the third lens element L3 and the fourth lens element L4 of the optical lens system according to the ninth preferred embodiment of the present invention are all double-sided lenses. As shown in fig. 33 of the drawings, the third lens L3 is disposed such that its convex surface S6 faces the object side and the convex surface S7 faces the image side, and the fourth lens L4 is disposed such that its concave surface S7' faces the object side and the convex surface S8 faces the image side. Therefore, the first lens L1 is a biconcave lens, the second lens L2 is a biconvex lens, the third lens L3 is a biconvex lens, and the fourth lens L4 is a biconcave lens. As shown in fig. 33 of the drawings, the fifth lens element L5 of the optical lens system according to the ninth preferred embodiment of the present invention has two surfaces S9 and S10, wherein the two surfaces S9 and S10 of the fifth lens element L5 face the object side and the image side, respectively, and at least one of the two surfaces S9 and S10 of the fifth lens element L5 is aspheric. In other words, the fifth lens L5 is a double-sided lens and has at least one aspheric surface. Preferably, one surface S9 of the fifth lens L5 faces the object side, and the other surface S10 faces the image side. More preferably, one of two surfaces S9, S10 of the fifth lens L5 is convex and the other is concave, wherein the convex surface S9 of the fifth lens L5 faces the object side and the concave surface S10 of the fifth lens L5 faces the image side. Alternatively, one of the two surfaces S9, S10 of the fifth lens L5 is convex and the other is flat.
As shown in fig. 33 of the drawings, the achromatic lens group of the optical lens according to the ninth preferred embodiment of the present invention is a cemented lens. In other words, the third lens L3 and the fourth lens L4 are cemented together to form the achromatic lens group. At this time, since the third lens L3 and the fourth lens L4 are cemented together, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are overlapped together. At this time, the convex surface S7 of the third lens L3 and the concave surface S7' of the fourth lens L4 are disposed to face each other. Alternatively, the achromatic lens group may be a double separation type achromatic lens group. It is to be understood that, when the achromatic lens group is a double-separation type achromatic lens group, the third lens L3 and the fourth lens L4 are separately disposed, and the stop L6 may be disposed between the third lens L3 and the fourth lens L4.
It should be noted that the first lens L1 can be made of glass material, or can be made of other materials with good light transmission property. It will be understood by those skilled in the art that when the refractive index of the first lens L1 is too high, the image light is too much diverged after passing through the first lens L1, so that the subsequent lens, such as the second lens L2, has to be configured to have a high refractive index, a large aperture and/or a large thickness to converge the light. Therefore, the refractive index Nd (1) of the first lens element L1 of the optical lens according to the ninth preferred embodiment of the present invention is smaller than or equal to 1.85, so as to avoid the image light from being too much divergent, as shown in tables 13A and 14A. In other words, the refractive index of the material of which the first lens L1 is made is not more than 1.85. In addition, in order to avoid excessive aberration of the imaging light after passing through the first lens L1, Abbe constant Vd (1) ≧ 40 is defined as the material of the first lens L1, as shown in tables 13A and 14A. In order to converge the image light passing through the first lens L1 and suppress further divergence of the image light so that the image light passing through the first lens L1 is smoothly transmitted to the rear lens group, the second lens L2 is set to have a higher refractive index, and therefore, the refractive index of the second lens L2 is Nd (2), and Nd (2) ≧ 1.55, as shown in tables 13A and 14A. In other words, the refractive index of the material of which the second lens L2 is made is not less than 1.55. Further, the second lens L2 is set to have an Abbe constant Vd (2), Vd (2) 20 ≦ 65 to effectively correct the axial chromatic aberration of the imaging light, as shown in tables 13A and 14A.
Meanwhile, the refractive index Nd (1) of the first lens L1 is less than or equal to 1.85, the Abbe constant Vd (1) is more than or equal to 40, the refractive index Nd (2) of the second lens L2 is more than or equal to 1.55, and the Abbe constant 20 is less than or equal to Vd (2) is less than or equal to 65, so that the first lens L1 and the second lens L2 can both be made of cheaper glass materials.
Therefore, the front lens group and the rear lens group of the optical lens according to the ninth preferred embodiment of the present invention are disposed such that a ratio of the total track length TTL of the optical lens to the focal length F of the optical lens satisfies: TTL/F is less than or equal to 7.5, wherein the total length TTL of the optical lens is the distance from the object-oriented concave surface of the first lens L1 to the image plane.
As shown in tables 13A and 14A below, an optical lens according to the ninth preferred embodiment of the present invention may be configured such that the concave surface S1 of the first lens L1 facing the object has a radius of curvature of-13.627 (from the object side to the image side), the concave surface S2 of the first lens L1 facing the image side has a radius of curvature of 3.363 (from the object side to the image side), the refractive index of the first lens L1 is 1.64, and the abbe constant of the first lens L1 is 55.6; when the curvature radius of the convex surface S4 of the second lens element L2 facing the object is 6.667 (from the object to the image), the curvature radius of the convex surface S5 of the second lens element L2 facing the image is-7.310 (from the object to the image), the refractive index of the second lens element L2 is 1.59, and the abbe constant of the second lens element L2 is 60.6, the MTF resolving curve of the optical lens according to the ninth preferred embodiment of the present invention is shown in fig. 34, the astigmatism curve of the optical lens is shown in fig. 35, and the distortion curve of the optical lens is shown in fig. 36. Therefore, the optical lens has good optical performance as shown in fig. 34 to 36 of the drawings.
Table 13A: parameters of each lens of optical lens
| Number of noodles | Radius of curvature R | Center thickness D | Refractive index Nd | Abbe constant Vd |
| S1 | -13.627 | 0.800 | 1.64 | 55.6 |
| S2 | 3.363 | 2.721 |
| STO | Infinity | 0.000 | ||
| S4 | 6.667 | 4.400 | 1.59 | 60.6 |
| S5 | -7.310 | 0.300 | ||
| S6 | 4.081 | 3.600 | 1.50 | 81.6 |
| S7 | -4.501 | 0.650 | ||
| S7′ | -4.501 | 0.650 | 1.75 | 52.3 |
| S8 | 58.260 | 0.180 | ||
| S9 | 6.983 | 2.000 | 1.51 | 63.8 |
| S10 | 9.823 | 0.500 | ||
| S11 | Infinity | 0.950 | 1.52 | 64.2 |
| S12 | Infinity | 1.763 | ||
| IMA | Infinity |
Table 14A: parameters of each lens of optical lens
| Nd(1) | Vd(1) | Nd(2) | Vd(2) | F1 | F | TTL | F1/F | TTL/F |
| 1.64 | 55.6 | 1.59 | 60.6 | -4.13 | 3.88 | 17.86 | -1.06 | 4.60 |
Optionally, the fifth lens L5 has at least one aspheric surface, and the aspheric surface satisfies the following formula:
where z (h) is a distance vector from a vertex of the aspheric surface when the aspheric surface has a height h along the optical axis, c is 1/r, r represents a curvature radius of the aspheric surface mirror surface, k is a conic coefficient, A, B, C, D, E is a high-order aspheric coefficient, and the above formula relates to the following parameters in table 15A:
TABLE 15A
| Surf | K | A | B | C | D | E |
| 9 | -18.79164 | -3.14487E-03 | -3.58652E-04 | -7.76989E-05 | 3.92281E-05 | -1.17564E-06 |
| 10 | -152.6418 | 1.62760E-03 | -2.19156E-03 | 6.79365E-04 | -4.90585E-05 | 1.04592E-06 |
In other words, at least one of the two surfaces S9 and S10 (S9 or S10) of the fifth lens L5 is aspheric, so as to improve the resolution and imaging performance of the fifth lens L5, thereby making the optical lens according to the ninth preferred embodiment of the present invention suitable for being miniaturized and having better imaging performance.
In summary, the optical lens according to the ninth preferred embodiment of the present invention can realize miniaturization of the whole optical lens under the premise of high-pixel, small-distortion and high-definition imaging, so that the optical lens is suitable for being used in the vehicle-mounted field. In addition, the parameters of each lens of the optical lens according to the ninth preferred embodiment of the present invention can be set to be made of a material insensitive to temperature variation, such as a glass material, so that the performance of the optical lens can be kept stable in an environment with large temperature variation. In other words, the optical lens according to the ninth preferred embodiment of the present invention can be configured with a lens group composed of a minimum of five lenses to realize high-pixel, small-distortion, high-definition imaging, and can be configured to be miniaturized and capable of stable imaging in a large temperature range. Those skilled in the art will appreciate that the embodiments of the invention illustrated in the drawings and described above are merely exemplary and not limiting of the invention.
It can thus be seen that the objects of the invention are sufficiently well-attained. The embodiments for explaining the functional and structural principles of the present invention have been fully illustrated and described, and the present invention is not limited by changes based on the principles of these embodiments. Accordingly, this invention includes all modifications encompassed within the scope and spirit of the following claims.
Claims (27)
1. An optical lens, comprising:
a first lens, wherein said first lens has a negative optical power;
a second lens, wherein said second lens has a positive optical power;
a third lens;
a fourth lens, wherein said third lens and said fourth lens comprise an achromatic lens group; and
a fifth lens, wherein the fifth lens has positive optical power, wherein the fifth lens has two surfaces, and at least one of the two surfaces of the fifth lens is aspheric, wherein the first lens has two concave surfaces, the second lens has two convex surfaces, the third lens has two convex surfaces, the fourth lens has one concave surface and one convex surface, wherein the two concave surfaces of the first lens face the object and image sides, respectively, the two convex surfaces of the second lens face the object and image sides, respectively, the two convex surfaces of the third lens face the object and image sides, respectively, the concave surface of the fourth lens faces the object and image sides, and the two surfaces of the fifth lens face the object and image sides, respectively, wherein the convex surface of the third lens facing the image side and the concave surface of the fourth lens facing the object are disposed opposite to each other, wherein, the total lens length TTL of the optical lens and the focal length F of the optical lens satisfy: TTL/F is less than or equal to 7.5; wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens form a front lens group and a rear lens group, wherein the front lens group includes at least the first lens, and the rear lens group includes at least the third lens, the fourth lens and the fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in this order from an object side to an image side; a focal length F (front) of the front lens group of the optical lens, a focal length F (rear) of the rear lens group of the optical lens, and a focal length F of the optical lens satisfy: 4.5 is more than or equal to F (front)/F is more than or equal to 1.3, and 5 is more than or equal to F (rear)/F is more than or equal to 1.5.
2. An optical lens according to claim 1, characterized in that the optical centers of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are coaxial.
3. An optical lens according to claim 2, further comprising an optical stop, wherein the optical stop is disposed in the front lens group, and an optical center of the optical stop is coaxial with optical centers of the first lens and the second lens.
4. An optical lens barrel according to any one of claims 1 to 3, wherein both surfaces of the fifth lens are convex.
5. An optical lens barrel according to any one of claims 1 to 3, wherein one of the two surfaces of the fifth lens is a convex surface and the other surface is a flat surface.
6. An optical lens barrel according to claim 1 or 2, further comprising an optical stop, wherein the optical stop is disposed in the rear lens group, and an optical center of the optical stop is coaxial with optical centers of the third lens, the fourth lens and the fifth lens.
7. An optical lens according to any one of claims 1 to 3, characterized in that the refractive index Nd (1) of the first lens is ≦ 1.85 and the Abbe constant Vd (1) ≧ 40 of the first lens.
8. An optical lens according to any one of claims 1 to 3, characterized in that the focal length F1 of the first lens and the focal length F of the optical lens satisfy:
-0.5≥F1/F≥-2。
9. an optical lens according to any one of claims 1 to 3, characterized in that the refractive index Nd (2) ≧ 1.55, and the Abbe constant Vd (2) ≦ 65 for the second lens.
10. An optical lens according to claim 4, characterized in that the refractive index Nd (2) ≧ 1.55 of the second lens, and the Abbe constant Vd (2) ≦ 65 of the second lens.
11. An optical lens, comprising:
a first lens, wherein said first lens has a negative optical power;
a second lens, wherein said second lens has a positive optical power;
a third lens;
a fourth lens, wherein said third lens and said fourth lens comprise an achromatic lens group; and
a fifth lens element, wherein the fifth lens element has positive optical power, wherein the fifth lens element has two surfaces, and at least one of the two surfaces of the fifth lens element is aspheric, wherein the first lens element has two concave surfaces, the second lens element has two convex surfaces, the third lens element has two convex surfaces, the fourth lens element has two concave surfaces, wherein the two concave surfaces of the first lens element face the object and image sides, respectively, the two convex surfaces of the second lens element face the object and image sides, respectively, the two convex surfaces of the third lens element face the object and image sides, respectively, the two concave surfaces of the fourth lens element face the object and image sides, respectively, one of the two surfaces of the fifth lens element is convex surface facing the object, the two surfaces of the fifth lens element face the object and image sides, respectively, wherein the convex surface of the third lens element facing the image side and the concave surface of the fourth lens element facing the object are disposed in a plane And oppositely, wherein the total lens length TTL of the optical lens and the focal length F of the optical lens meet the following conditions: TTL/F is less than or equal to 7.5; wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens form a front lens group and a rear lens group, wherein the front lens group includes at least a first lens, and the rear lens group includes at least the third lens, the fourth lens and the fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially disposed in a direction from an object side to an image side; a focal length F (front) of the front lens group of the optical lens, a focal length F (rear) of the rear lens group of the optical lens, and a focal length F of the optical lens satisfy: 4.5 is more than or equal to F (front)/F is more than or equal to 1.3, and 5 is more than or equal to F (rear)/F is more than or equal to 1.5.
12. An optical lens according to claim 11, characterized in that the optical centers of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are coaxial.
13. An optical lens barrel according to claim 12, further comprising an optical stop, wherein the optical stop is disposed in the front lens group, and an optical center of the optical stop is coaxial with optical centers of the first lens and the second lens.
14. An optical lens barrel according to claim 13, wherein the other of the two surfaces of the fifth lens is a concave surface facing an image side.
15. An optical lens according to claim 13, characterized in that the other of the two surfaces of the fifth lens is a plane.
16. An optical lens barrel according to claim 11 or 12, further comprising an optical stop, wherein the optical stop is disposed in the rear lens group, and an optical center of the optical stop is coaxial with optical centers of the third lens, the fourth lens and the fifth lens.
17. An optical lens according to any one of claims 11 to 15, characterized in that the refractive index Nd (1) of the first lens is ≦ 1.85 and the Abbe constant Vd (1) ≧ 40 of the first lens.
18. An optical lens according to any one of claims 11 to 15, characterized in that the focal length F1 of the first lens and the focal length F of the optical lens satisfy:
-0.5≥F1/F≥-2。
19. an optical lens according to any one of claims 11 to 15, characterized in that the refractive index Nd (2) ≧ 1.55 and the Abbe constant Vd (2) ≦ 65 for the second lens.
20. An optical lens, comprising:
a first lens, wherein said first lens has a negative optical power;
a second lens, wherein said second lens has a positive optical power;
a third lens;
a fourth lens, wherein said third lens and said fourth lens comprise an achromatic lens group; and
a fifth lens, wherein the fifth lens has positive optical power, wherein the fifth lens has two surfaces, and at least one of the two surfaces of the fifth lens is aspheric, wherein the first lens has two concave surfaces, the second lens has two convex surfaces, the third lens has two convex surfaces, the fourth lens has two concave surfaces, wherein the two concave surfaces of the first lens face the object and the image respectively, the two convex surfaces of the second lens face the object and the image respectively, the two convex surfaces of the third lens face the object and the image respectively, the two concave surfaces of the fourth lens face the object and the image respectively, the two surfaces of the fifth lens face the object and the image respectively, wherein the convex surface of the third lens facing the image and the concave surface of the fourth lens facing the object are disposed to face each other, wherein, the total lens length TTL of the optical lens and the focal length F of the optical lens satisfy: TTL/F is less than or equal to 6.5; wherein a focal length F (front) of a front lens group of the optical lens, a focal length F (rear) of a rear lens group of the optical lens, and a focal length F of the optical lens satisfy: 4.5 ≧ F (front)/F ≧ 1.3 and 5 ≧ F (rear)/F ≧ 1.5, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens form the front lens group and the rear lens group, wherein the front lens group includes at least a first lens, the rear lens group includes at least the third lens, the fourth lens and the fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are disposed in order from an object side to an image side.
21. An optical lens according to claim 20, characterized in that the refractive index Nd (1) ≦ 1.8 of the first lens and the Abbe constant Vd (1) ≧ 40 of the first lens.
22. An optical lens according to claim 20, characterized in that the refractive index Nd (1) ≦ 1.65 of the first lens and the Abbe constant Vd (1) ≧ 55 of the first lens.
23. An optical lens according to claim 20, wherein the focal length F1 of the first lens and the focal length F of the optical lens satisfy:
-0.9≥F1/F≥-2。
24. an optical lens according to claim 20, characterized in that the refractive index Nd (2) ≧ 1.73 of the second lens, and the Abbe constant Vd (2) ≧ 40 of the second lens.
25. An optical lens according to claim 23, characterized in that the refractive index Nd (2) ≧ 1.73 of the second lens, and the Abbe constant Vd (2) ≧ 40 of the second lens.
26. An optical lens barrel according to claim 20, wherein the object side surface of the fifth lens element is concave and the image side surface is convex.
27. An optical lens barrel according to claim 20, wherein the surface of the fifth lens facing the image side is concave and the surface facing the object side is convex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510679740.7A CN105527694B (en) | 2014-10-20 | 2015-10-19 | Optical lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2014105590698 | 2014-10-20 | ||
| CN201410559069.8A CN104297906A (en) | 2014-10-20 | 2014-10-20 | Optical lens |
| CN201510679740.7A CN105527694B (en) | 2014-10-20 | 2015-10-19 | Optical lens |
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| Publication Number | Publication Date |
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| CN105527694A CN105527694A (en) | 2016-04-27 |
| CN105527694B true CN105527694B (en) | 2020-12-22 |
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| CN201520812120.1U Active CN206209180U (en) | 2014-10-20 | 2015-10-19 | Optical lens |
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| CN201410559069.8A Pending CN104297906A (en) | 2014-10-20 | 2014-10-20 | Optical lens |
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| CN105527694A (en) | 2016-04-27 |
| CN104297906A (en) | 2015-01-21 |
| CN206209180U (en) | 2017-05-31 |
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