CN109212715B - Optical lens - Google Patents

Abstract

The present application discloses an optical lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and at least one subsequent lens. The object side surfaces of the first lens and the third lens are both concave surfaces, and the image side surfaces of the first lens and the third lens are both convex surfaces; the object side surface and the image side surface of the second lens are convex surfaces; at least one of the object side surface and the image side surface of the fourth lens is a convex surface; and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface. Wherein the first lens has a negative focal power; at least three of the second lens, the third lens, the fourth lens and the fifth lens have positive focal power; and the combined power of at least one subsequent lens is a negative power.

Description

Optical lens

Technical Field

The present application relates to an optical lens, and more particularly, to an optical lens including seven lenses.

Background

As the requirements for the pixels of the imaging device increase, the corresponding chip size also increases, resulting in an increase in the overall size of the lens. Meanwhile, in some special applications, such as night use of a vehicle-mounted lens, in order to improve the effect of night use of the lens, the clear aperture of the lens generally needs to be increased, which also results in an increase in the aperture of the lens.

However, for some applications with limited mounting locations, a small size lens is required to meet the mounting requirements. For example, an on-board lens that needs to be mounted inside a windshield, requires a special lens design to meet the requirements of small aperture and size due to the risk of interference with the windshield and the limited mounting location.

Disclosure of Invention

The present application provides an optical lens that is adaptable for on-board installation and that overcomes, at least in part, at least one of the above-identified deficiencies in the prior art.

One aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and at least one subsequent lens. The object side surfaces of the first lens and the third lens can be concave surfaces, and the image side surfaces of the first lens and the third lens can be convex surfaces; both the object side surface and the image side surface of the second lens can be convex surfaces; at least one of the object-side surface and the image-side surface of the fourth lens may be convex; and the object side surface of the fifth lens element can be convex, and the image side surface can be concave. Wherein the first lens may have a negative optical power; at least three of the second lens, the third lens, the fourth lens, and the fifth lens may have positive optical power; and the combined power of at least one subsequent lens may be a negative power.

In one embodiment, the second lens, the fourth lens, and the fifth lens may each have a positive optical power; and the third lens may have a negative optical power.

In one embodiment, the second lens and the third lens may be cemented to form a first cemented lens.

In one embodiment, the at least one subsequent lens may comprise a sixth lens having a negative optical power, and both the object-side surface and the image-side surface thereof may be concave. Optionally, the optical lens may further include a diaphragm disposed between the first lens and the second lens.

In one embodiment, the at least one subsequent lens, in order from the fifth lens to the image side along the optical axis, comprises: and a sixth lens and a seventh lens, wherein at least one of the sixth lens and the seventh lens may have a negative optical power.

In one embodiment, the sixth lens and the seventh lens may each have a negative optical power.

In one embodiment, the object-side surface of the sixth lens element can be concave, and the image-side surface can be convex; and the object side surface and the image side surface of the seventh lens can be both concave.

In one embodiment, the sixth lens and the seventh lens may be cemented to constitute a second cemented lens.

In one embodiment, the optical lens may further include a stop disposed between the object side and the first lens.

In one embodiment, the distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis and the whole group focal length value f of the optical lens can satisfy TTL/f ≦ 3.2.

In one embodiment, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens may satisfy D/h/FOV ≦ 0.051.

Another aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and at least one subsequent lens. The first lens element can have negative focal power, and the object-side surface can be a concave surface and the image-side surface can be a convex surface; at least three of the second lens, the third lens, the fourth lens and the fifth lens have positive focal power; the second lens and the third lens can be cemented to form a first cemented lens; and the combined power of at least one subsequent lens may be a negative power.

In one embodiment, the third lens may have a negative optical power.

In one embodiment, the second lens can have a positive optical power, and both the object-side surface and the image-side surface can be convex; the object-side surface of the third lens element can be concave, and the image-side surface can be convex.

In one embodiment, the fourth lens may have a positive optical power and the object side surface thereof may be convex.

In one embodiment, the fifth lens element can have a positive optical power, and the object-side surface can be convex and the image-side surface can be concave.

In one embodiment, the optical lens may further include a stop disposed between the object side and the second lens.

In one embodiment, the at least one subsequent lens may comprise a sixth lens having a negative optical power.

In one embodiment, both the object-side surface and the image-side surface of the sixth lens may be concave.

In one embodiment, the at least one subsequent lens, in order from the fifth lens to the image side along the optical axis, can comprise: a sixth lens and a seventh lens, wherein the sixth lens and the seventh lens may each have a negative optical power.

In one embodiment, the object-side surface of the sixth lens element can be concave, and the image-side surface can be convex; and the object side surface and the image side surface of the seventh lens can be both concave.

In one embodiment, the distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis and the whole group focal length value f of the optical lens can satisfy TTL/f ≦ 3.2.

In one embodiment, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens may satisfy D/h/FOV ≦ 0.051.

The method and the device adopt seven lenses, control over the aperture of the front end of the lens is achieved through reasonable arrangement of the shape of the first lens, and further the aperture of the front end of the lens is reduced through the front diaphragm.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic view showing a structure of an optical lens according to embodiment 2 of the present application;

fig. 3 is a schematic view showing a structure of an optical lens according to embodiment 3 of the present application;

fig. 4 is a schematic structural view showing an optical lens according to embodiment 4 of the present application;

fig. 5 is a schematic view showing a structure of an optical lens according to embodiment 5 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens, and the first cemented lens may also be referred to as the second cemented lens, without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An optical lens according to an exemplary embodiment of the present application includes, in order from an object side to an image side along an optical axis, at least six lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and at least one subsequent lens.

The optical lens according to the exemplary embodiment of the present application may further include a photosensitive element disposed on the image plane. Alternatively, the photosensitive element provided to the imaging plane may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

The first lens element can have a negative power, and can have a concave object-side surface and a convex image-side surface. The first lens is capable of collecting as large a field of view as possible and passing the collected light into the rear optical system. The first lens is arranged in a meniscus shape with the concave surface facing the object side, so that the reduction of the caliber of the front end of the optical lens is facilitated, and the reduction of the size of the front end of the optical lens is facilitated. In addition, the object side surface of the first lens is arranged to be a concave surface, so that the distortion can be moderately increased, and the lens is suitable for a vehicle event recorder and the like which need to focus on observing a front small-range image.

The second lens element can have a positive power, and can have a convex object-side surface and a convex image-side surface.

The third lens element can have a negative power, and can have a concave object-side surface and a convex image-side surface.

The fourth lens element can have a positive power, and can have a convex object-side surface and a convex or concave image-side surface. The fourth lens can converge the light collected by the third lens, adjust the light and enable the light trend to be stably transited to the fifth lens.

The fifth lens element can have a positive power, and can have a convex object-side surface and a concave image-side surface. The fifth lens can further converge the light collected by the fourth lens, and adjust the light to enable the light to stably transit to the sixth lens, so that the diameter of the rear port of the lens is reduced.

The combined power of at least one subsequent lens is a negative power.

In some embodiments, the at least one subsequent lens may include a sixth lens having optical power (for convenience, lenses made up of six lenses are collectively referred to herein as a system of six lenses). In these embodiments, the sixth lens element can have a negative optical power, and the object-side surface can be concave and the image-side surface can be concave. The sixth lens can enable the front light to be further and stably transited to the rear optical system, and the reduction of the diameter of a rear port and the size of the rear end of the lens is facilitated.

In other embodiments, the at least one subsequent lens may include a sixth lens and a seventh lens having optical power (for convenience of description, lenses made of seven lenses are collectively referred to as a system of seven lenses in this application). In these embodiments, the sixth lens element can have a negative power, and the object-side surface can be concave and the image-side surface can be convex. The seventh lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface.

As known to those skilled in the art, cemented lenses may be used to minimize or eliminate chromatic aberration. The cemented lens used in the optical lens can improve the image quality, reduce the reflection loss of light energy and improve the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

In an exemplary embodiment, the second lens and the third lens may be combined into the first cemented lens by cementing the image-side surface of the second lens with the object-side surface of the third lens. By introducing the first cemented lens consisting of the second lens and the third lens, the chromatic aberration influence can be eliminated, and the tolerance sensitivity of the system is reduced; meanwhile, the cemented second lens and third lens may also retain a partial chromatic aberration to balance the entire chromatic aberration of the optical system. In the first cemented lens, the second lens close to the object side has positive focal power, and the third lens close to the image side has negative focal power, so that the arrangement is favorable for further smoothly transitioning the light rays passing through the first lens to the fourth lens, thereby shortening the total optical length of the system and being favorable for realizing the miniaturization of the lens.

In addition, in the seven-lens system, the sixth lens and the seventh lens may also be combined into a second cemented lens by cementing the image-side surface of the sixth lens with the object-side surface of the seventh lens. The second cemented lens composed of the sixth lens and the seventh lens has the advantages of self achromatism, reduction of tolerance sensitivity of the system and residual chromatic aberration so as to balance the whole chromatic aberration of the optical system, and the like, and can further smoothly transit the front light to the rear optical system, thereby being beneficial to reduction of the rear port diameter and the rear end size of the lens and shortening of the optical total length of the system, and being beneficial to realization of miniaturization of the lens.

In an exemplary embodiment, a stop for limiting the light beam may be disposed, for example, between the object side and the second lens to further improve the imaging quality of the lens. When the stop is disposed between the object side and the second lens (i.e., when the stop is in the front position), it is also advantageous to reduce the front-end aperture and the front-end size of the lens. In particular, in a system of six lenses, a diaphragm may be disposed between the first lens and the second lens. In a seven-lens system, a stop may be disposed between the object side and the first lens.

An overall optical length TTL (i.e., an on-axis distance from a center of an object-side surface of the first lens element to an imaging surface of the optical lens) of the optical lens and a whole-group focal length value f of the optical lens may satisfy TTL/f ≦ 3.2, and more specifically, TTL and f may further satisfy 2.52 ≦ TTL/f ≦ 2.65. The condition formula TTL/f is less than or equal to 3.2, and the miniaturization characteristic of the lens can be embodied.

The maximum clear aperture D of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens can satisfy D/h/FOV less than or equal to 0.051, more specifically D, h and FOV can further satisfy 0.0373 less than or equal to D/h/FOV less than or equal to 0.0501. The condition that D/h/FOV is less than or equal to 0.051 is met, and the small aperture at the front end of the lens can be reflected.

Alternatively, the optical lens according to the embodiment of the present application may be applied to a telephoto lens.

The optical lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six or seven lenses as described above. A small front-end aperture of the lens can be achieved by controlling the shape of the first lens of the above optical lens (i.e., arranging the first lens in a meniscus shape with the concave surface facing the object side); by setting the diaphragm forward, the front aperture and the front size of the lens can be further reduced, so that the lens is more suitable for a vehicle-mounted lens. Meanwhile, through reasonably distributing the focal power and the surface type of each lens of the optical lens and reasonably using the cemented lens, the total optical length of the lens is shortened, the improvement of the image resolution performance of the lens is realized, the lens has better imaging quality, the risk of software misjudgment is reduced, and the lens can better meet the requirements of a vehicle-mounted lens.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six or seven lenses are exemplified in the embodiment, the optical lens is not limited to include six or seven lenses. The optical lens may also include other numbers of lenses, if desired.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an image plane S16.

The first lens element L1 is a negative meniscus lens with a concave object-side surface S2 and a convex image-side surface S3.

The second lens element L2 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a meniscus lens element with negative power, with the object side S5 being concave and the image side S6 being convex. Wherein, the second lens L2 and the third lens L3 are cemented to form a first cemented lens.

The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S7 and a convex image-side surface S8.

The fifth lens L5 is a meniscus lens with positive power, with the object side S9 being convex and the image side S10 being concave.

The sixth lens element L6 is a meniscus lens element with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a biconcave lens with negative power, and has a concave object-side surface S12 and a concave image-side surface S13. Wherein, the sixth lens L6 and the seventh lens L7 are cemented to form a second cemented lens.

Optionally, the optical lens may further include a filter L8 having an object side S14 and an image side S15. Optionally, the optical lens may further include a protective glass disposed between the seventh lens L7 and the image side surface S16. The light from the object passes through the respective surfaces S2 to S15 in order and is finally imaged on the imaging surface S16.

In the optical lens of this embodiment, a stop STO may be disposed between the object side and the first lens L1 to reduce the front aperture of the lens and improve the imaging quality of the lens.

Table 1 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1, where the radius of curvature R and the thickness T are both in units of millimeters (mm).

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					STO	Infinity	2.0000
S2	-13.6873	3.2000	1.52	64.21
					S3	-25.5414	0.1500
S4	39.7853	9.6785	1.50	81.59
					S5	-11.2894	3.0000	1.67	39.20
S6	-21.0739	0.1000
					S7	12.4769	13.5466	1.50	81.59
S8	-150.1047	0.1500
					S9	15.1757	3.0000	1.76	52.33
S10	39.9923	1.4390
					S11	-12.8241	1.0000	1.92	18.90
S12	-32.9642	1.2000	1.80	46.57
					S13	35.5636	1.0000
S14	Infinity	0.9500	1.52	64.17
					S15	Infinity	1.8144
S16	Infinity

TABLE 1

Table 2 below shows the entire group focal length f of the optical lens of example 1, the total optical length TTL of the optical lens (i.e., the on-axis distance from the center of the object-side surface S2 of the first lens L1 to the image plane S16), the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S2 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens.

Parameter(s)	f(mm)	TTL(mm)	FOV(°)	D(mm)	h(mm)
						Numerical value	16.73	42.23	34	12.48	9.77

TABLE 2

In the present embodiment, TTL/f is 2.52, which is satisfied between the total optical length TTL of the optical lens and the entire focal length f of the optical lens; the maximum view field angle FOV of the optical lens, the maximum clear aperture D of the object side S2 of the first lens L1 corresponding to the maximum view field angle of the optical lens, and the image height h corresponding to the maximum view field angle of the optical lens satisfy D/h/FOV 0.0376.

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an image plane S16.

The first lens element L1 is a negative meniscus lens with a concave object-side surface S2 and a convex image-side surface S3.

The second lens element L2 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a meniscus lens element with negative power, with the object side S5 being concave and the image side S6 being convex. Wherein, the second lens L2 and the third lens L3 are cemented to form a first cemented lens.

The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S7 and a convex image-side surface S8.

The fifth lens L5 is a meniscus lens with positive power, with the object side S9 being convex and the image side S10 being concave.

The sixth lens element L6 is a meniscus lens element with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a biconcave lens with negative power, and has a concave object-side surface S12 and a concave image-side surface S13. Wherein, the sixth lens L6 and the seventh lens L7 are cemented to form a second cemented lens.

Optionally, the optical lens may further include a filter L8 having an object side S14 and an image side S15. Optionally, the optical lens may further include a protective glass disposed between the seventh lens L7 and the image side surface S16. Light from the object sequentially passes through the respective surfaces S2 to S15 and is finally imaged on the imaging surface S16.

In the optical lens of this embodiment, a stop STO may be disposed between the object side and the first lens L1 to reduce the front aperture of the lens and improve the imaging quality of the lens.

Table 3 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 2, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 4 shows the entire focal length f of the optical lens, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S2 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens in example 2.

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					STO	Infinity	2.0000
S2	-12.4840	3.2000	1.52	64.21
					S3	-19.3411	0.1500
S4	32.1368	9.1539	1.50	81.59
					S5	-10.4626	3.0000	1.67	39.20
S6	-20.9940	0.1000
					S7	10.8512	11.1952	1.50	81.59
S8	-165.6327	0.1500
					S9	14.3507	3.0000	1.76	52.33
S10	30.6706	1.4390
					S11	-10.5306	1.0000	1.92	18.90
S12	-43.5248	1.2000	1.80	46.57
					S13	44.5713	1.0000
S14	Infinity	0.9500	1.52	64.17
					S15	Infinity	0.4869
S16	Infinity

TABLE 3

Parameter(s)	f(mm)	TTL(mm)	FOV(°)	D(mm)	h(mm)
						Numerical value	14.37	38.03	34	10.78	8.37

TABLE 4

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an image plane S16.

The first lens element L1 is a negative meniscus lens with a concave object-side surface S2 and a convex image-side surface S3.

The second lens element L2 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a meniscus lens element with negative power, with the object side S5 being concave and the image side S6 being convex. Wherein, the second lens L2 and the third lens L3 are cemented to form a first cemented lens.

The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S7 and a convex image-side surface S8.

The fifth lens L5 is a meniscus lens with positive power, with the object side S9 being convex and the image side S10 being concave.

The sixth lens element L6 is a meniscus lens element with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a biconcave lens with negative power, and has a concave object-side surface S12 and a concave image-side surface S13. Wherein, the sixth lens L6 and the seventh lens L7 are cemented to form a second cemented lens.

Optionally, the optical lens may further include a filter L8 having an object side S14 and an image side S15. Optionally, the optical lens may further include a protective glass disposed between the seventh lens L7 and the image side surface S16. The light from the object passes through the respective surfaces S2 to S15 in order and is finally imaged on the imaging surface S16.

In the optical lens of this embodiment, a stop STO may be disposed between the object side and the first lens L1 to reduce the front aperture of the lens and improve the imaging quality of the lens.

Table 5 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 3, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 6 shows the entire focal length f of the optical lens, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S2 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens in example 3.

TABLE 5

Parameter(s)	f(mm)	TTL(mm)	FOV(°)	D(mm)	h(mm)
						Numerical value	15.68	41.44	34	11.75	9.14

TABLE 6

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an image plane S16.

The first lens element L1 is a negative meniscus lens with a concave object-side surface S2 and a convex image-side surface S3.

The second lens element L2 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a meniscus lens element with negative power, with the object side S5 being concave and the image side S6 being convex. Wherein, the second lens L2 and the third lens L3 are cemented to form a first cemented lens.

The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S7 and a convex image-side surface S8.

The fifth lens L5 is a meniscus lens with positive power, with the object side S9 being convex and the image side S10 being concave.

The sixth lens element L6 is a meniscus lens element with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a biconcave lens with negative power, and has a concave object-side surface S12 and a concave image-side surface S13. Wherein, the sixth lens L6 and the seventh lens L7 are cemented to form a second cemented lens.

Optionally, the optical lens may further include a filter L8 having an object side S14 and an image side S15. Optionally, the optical lens may further include a protective glass disposed between the seventh lens L7 and the image side surface S16. The light from the object passes through the respective surfaces S2 to S15 in order and is finally imaged on the imaging surface S16.

In the optical lens of this embodiment, a stop STO may be disposed between the object side and the first lens L1 to reduce the front aperture of the lens and improve the imaging quality of the lens.

Table 7 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 4, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 8 shows the entire focal length f of the optical lens, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S2 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens in example 4.

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					STO	Infinity	2.0000
S2	-17.9419	3.8000	1.52	64.21
					S3	-24.3370	0.1500
S4	35.1467	12.0000	1.50	81.59
					S5	-13.7595	3.0000	1.67	39.20
S6	-29.4768	0.0050
					S7	14.5522	17.0795	1.50	81.59
S8	-60.4990	0.1500
					S9	17.8183	2.8974	1.76	52.33
S10	29.7502	1.5754
					S11	-13.0210	1.0000	1.92	18.90
S12	-105.9667	1.2000	1.80	46.57
					S13	47.5367	0.5556
S14	Infinity	0.9500	1.52	64.17
					S15	Infinity	0.4869
S16	Infinity

TABLE 7

Parameter(s)	f(mm)	TTL(mm)	FOV(°)	D(mm)	h(mm)
						Numerical value	18.50	46.85	34	13.81	10.88

TABLE 8

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural diagram of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an image plane S15.

The first lens element L1 is a negative meniscus lens with a concave object-side surface S1 and a convex image-side surface S2.

The second lens element L2 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a meniscus lens element with negative power, with the object side S5 being concave and the image side S6 being convex. Wherein, the second lens L2 and the third lens L3 are cemented to form a first cemented lens.

The fourth lens L4 is a meniscus lens with positive power, with the object side S7 being convex and the image side S8 being concave.

The fifth lens L5 is a meniscus lens with positive power, with the object-side surface S9 being convex, the image-side surface S10 being concave, and the object-side surface S9 and the image-side surface S10 of the fifth lens L5 both being aspheric.

The sixth lens element L6 is a biconcave lens element with negative power, and has a concave object-side surface S11 and a concave image-side surface S12.

Optionally, the optical lens may further include a filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass disposed between the sixth lens L6 and the image side surface S15. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the optical lens of the present embodiment, a stop STO may be disposed between the first lens L1 and the second lens L2 to reduce the front end aperture of the lens and improve the imaging quality of the lens.

Table 9 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 5, where the radius of curvature R and the thickness T are both in units of millimeters (mm).

TABLE 9

The aspherical surface profile Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, where c is 1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 9 above); k is the conic coefficient conc; A. b, C, D, E are all high order term coefficients. Table 10 shows the conic coefficient k and the high-order term coefficient A, B, C, D, E which are suitable for each of the aspherical lens surfaces S9 and S10 in example 5.

Flour mark

k

A

B

C

D

E

S9

0.0504

-9.3544E-06

-4.5397E-07

-1.7149E-08

2.8847E-10

-3.5677E-12

S10

-30.1907

-3.7751E-05

4.4360E-05

-4.3285E-06

1.8947E-07

-2.9799E-09

Watch 10

Table 11 shows the entire focal length f of the optical lens, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens in example 5.

Parameter(s)	f(mm)	TTL(mm)	FOV(°)	D(mm)	h(mm)
						Numerical value	16.60	42.71	31.4	14.26	9.06

TABLE 11

In summary, examples 1 to 5 each satisfy the relationship shown in table 12 below.

Conditional expression (A) example	1	2	3	4	5
						TTL/f	2.52	2.65	2.64	2.53	2.57
D/h/FOV	0.0376	0.0379	0.0378	0.0373	0.0501

TABLE 12

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (18)

1. An optical lens in which a plurality of lenses having refractive power composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and one or two subsequent lenses are arranged in order from an object side to an image side along an optical axis,

the object side surfaces of the first lens and the third lens are both concave surfaces, and the image side surfaces of the first lens and the third lens are both convex surfaces;

the object side surface and the image side surface of the second lens are convex surfaces, and the second lens and the third lens are glued to form a first cemented lens;

the object side surface of the fourth lens is a convex surface; and

the object side surface of the fifth lens is a convex surface, the image side surface of the fifth lens is a concave surface,

wherein the first lens and the third lens each have a negative optical power; the second lens, the fourth lens and the fifth lens each have positive optical power; and the combined power of the one or two subsequent lenses is a negative power;

the optical lens satisfies: (D180 degree/(h FOV) 9.180 is less than or equal to,

wherein the FOV is the maximum field angle of the optical lens;

d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens; and

h is the image height corresponding to the maximum field angle of the optical lens.

2. An optical lens as claimed in claim 1, characterized in that the one or two subsequent lenses comprise a sixth lens having a negative optical power, the object-side surface and the image-side surface of which are both concave.

3. An optical lens according to claim 2, characterized in that the optical lens further comprises a diaphragm disposed between the first lens and the second lens.

4. The optical lens of claim 1, wherein the one or two subsequent lenses, in order from the fifth lens to the image side along an optical axis, comprise: a sixth lens and a seventh lens, wherein at least one of the sixth lens and the seventh lens has a negative optical power.

5. An optical lens according to claim 4, characterized in that the sixth lens and the seventh lens each have a negative optical power.

6. An optical lens barrel according to claim 4, wherein the sixth lens element has a concave object-side surface and a convex image-side surface; and

and the object side surface and the image side surface of the seventh lens are both concave surfaces.

7. An optical lens according to claim 6, wherein the sixth lens and the seventh lens are cemented to form a second cemented lens.

8. An optical lens according to claim 7, further comprising a diaphragm disposed between the object side and the first lens.

9. An optical lens according to any one of claims 1 to 8, characterized in that TTL/f ≦ 3.2,

wherein f is the whole group of focal length values of the optical lens; and

TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the optical lens.

10. An optical lens in which a plurality of lenses having refractive power composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and one or two subsequent lenses are arranged in order from an object side to an image side along an optical axis,

the first lens has negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface;

the object side surface of the fourth lens is a convex surface;

the second lens, the fourth lens and the fifth lens each have a positive optical power, and the third lens has a negative optical power;

the second lens and the third lens are cemented to form a first cemented lens;

the combined focal power of the one or two subsequent lenses is negative focal power; and

the optical lens satisfies: (D180 degree/(h FOV) 9.180 is less than or equal to,

wherein the FOV is the maximum field angle of the optical lens;

d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens; and

h is the image height corresponding to the maximum field angle of the optical lens.

11. An optical lens system according to claim 10, characterized in that the second lens element has a positive optical power, and both the object-side surface and the image-side surface thereof are convex;

the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface.

12. An optical lens barrel according to claim 10, wherein the fifth lens element has a positive optical power, and has a convex object-side surface and a concave image-side surface.

13. An optical lens according to claim 10, further comprising a stop disposed between the object side and the second lens.

14. An optical lens according to any one of claims 10 to 13, characterized in that the one or two subsequent lenses comprise a sixth lens having a negative optical power.

15. An optical lens barrel according to claim 14, wherein the object side surface and the image side surface of the sixth lens are both concave.

16. The optical lens barrel according to any one of claims 10 to 13, wherein the one or two subsequent lenses, in order from the fifth lens to the image side along an optical axis, comprise: a sixth lens and a seventh lens, wherein the sixth lens and the seventh lens each have a negative optical power.

17. An optical lens barrel according to claim 16, wherein the sixth lens element has a concave object-side surface and a convex image-side surface; and

and the object side surface and the image side surface of the seventh lens are both concave surfaces.

18. An optical lens as claimed in claim 10, 15 or 17, characterized in that TTL/f ≦ 3.2,

wherein f is the whole group of focal length values of the optical lens; and

TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the optical lens.

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