CN110753868B

CN110753868B - Optical lens and lens module

Info

Publication number: CN110753868B
Application number: CN201880036970.3A
Authority: CN
Inventors: 刘春梅; 王明珠; 郭楠
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2017-06-08
Filing date: 2018-06-08
Publication date: 2022-10-04
Anticipated expiration: 2038-06-08
Also published as: CN208569158U; CN109031590B; CN110753868A; CN109031590A

Abstract

Optical lens and lens module, optical lens includes from the thing side to the image side in proper order: a first lens (L1) having a positive refractive power; a second lens (L2) having a negative focal power; a third lens (L3) having a positive refractive power; a fourth lens (L4); a fifth lens (L5) having a negative focal power; a sixth lens (L6) having a positive refractive power; and a seventh lens (L7) having a negative power; the aperture Fno of the optical lens is smaller than 1.65, and the optical length TTL of the optical lens is smaller than 5 millimeters. The optical lens and the lens module can keep the miniaturization of the lens and realize the optical lens and the lens module with large aperture at the same time through the optimized setting of the focal power of the lens.

Description

Optical lens and lens module

Technical Field

The present invention relates to the field of optical lenses and lens modules, and more particularly, to an optical lens and a lens module capable of realizing a large aperture while keeping the lens compact.

Background

Imaging apparatuses, such as camera-mounted mobile apparatuses and digital still cameras, using, for example, a Charge Coupled Device (CCD) and a Complementary Metal Oxide Semiconductor (CMOS) as a solid-state imaging element have been well known.

With the development of science and technology, the requirement of the resolution of the optical lens is higher and higher, and the original megapixels are gradually increased towards the direction of millions of pixels, and the high-pixel lens is more and more popular.

Generally, the resolution can be improved by increasing the number of lenses in the optical lens, so that the number of lenses in the optical lens is increased with the demand for the optical lens, for example, 5 to 6 lenses, and thus, the volume and the weight of the optical lens are increased.

On the other hand, with the spread of mobile devices, there is a demand for the application of more and more small-sized imaging devices, such as those applied to mobile phones, and the demand for small-sized imaging devices is also very high.

Further, as an optical lens having a large aperture, high pixel and high quality becomes mainstream, it is a problem that the aperture of the conventional optical lens is too small.

Accordingly, there is a need for improved optical lenses and lens modules.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks and disadvantages of the prior art, and providing a novel and improved optical lens and lens module capable of realizing a large aperture while keeping the lens compact.

An object of the present invention is to provide an optical lens and a lens module, in which a large aperture optical lens satisfying a slim design can be obtained by setting optical powers of first to seventh lenses in the optical lens so that an aperture of the optical lens is less than 1.65 and an optical length of the optical lens is less than 5 mm.

In the optical lens according to the embodiment of the invention, the ratio of the optical length of the optical lens to the maximum image height of the optical lens is less than 1.6 by setting the focal powers of the first lens to the seventh lens in the optical lens, so that the miniaturization of an optical system can be maintained, and the thin design requirement of the optical lens can be met.

An object of the present invention is to provide an optical lens and a lens module, which can effectively reduce the aberration of the optical system by setting the curvature radius of the object side surface R3 and the curvature radius of the image side surface R4 of the third lens element so as to satisfy-2 < (R3 + R4)/(R3-R4) < -1.

An object of the present invention is to provide an optical lens and a lens module, in which through setting the focal powers of a first lens to a seventh lens in the optical lens, so that the ratio between D34 and the focal length of the whole set of the optical lens is greater than 0.08 and less than 0.15, astigmatism and curvature of field can be corrected while controlling the range of CRA, and good imaging performance of the optical lens can be obtained.

In the optical lens according to the embodiment of the present invention, by setting the optical powers of the first lens to the seventh lens in the optical lens so that the ratio between the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens to the entrance pupil aperture of the optical system is less than 2, the amount of light entering the optical lens can be increased and the miniaturization thereof can be maintained.

In the optical lens according to the embodiment of the present invention, by setting the focal powers of the first lens element to the seventh lens element in the optical lens such that the ratio of the total focal length of the optical lens to the combined focal length of the first lens element to the third lens element is greater than 0.7 and less than 1, the refractive powers of the first group consisting of the first lens element to the third lens element can be properly equalized, the aberration of the optical system can be further corrected, and the system back focal length can be shortened to maintain the system miniaturization.

According to an aspect of the present invention, there is provided an optical lens including, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens; a fifth lens having a negative optical power; a sixth lens having positive optical power; and, a seventh lens having a negative optical power; wherein the aperture of the optical lens is less than 1.65 and the optical length of the optical lens is less than 5 millimeters.

In the above optical lens system, the first lens element is a meniscus lens element convex toward the object side, the object side surface of the meniscus lens element is convex, and the image side surface of the meniscus lens element is concave; the second lens is a meniscus lens convex to the object side, the object side of the second lens is convex, and the image side of the second lens is concave; the third lens is a meniscus lens convex to the object side, the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface; the fourth lens is a meniscus lens convex to the image side, the object side of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface; the fifth lens is a meniscus lens convex to the object side, and the object side surface of the fifth lens is convex and the image side surface of the fifth lens is concave; the sixth lens element is a biconvex lens element, and has a convex object-side surface and a convex image-side surface; and, the seventh lens is a biconcave lens, the object side surface of which is concave and the image side surface of which is concave.

In the above optical lens, the fourth lens has a positive refractive power, or the fourth lens has a negative refractive power.

In the above optical lens, the first to seventh lenses satisfy the following conditional expression (1):

TTL/Imgh＜1.6 (1)

wherein TTL is an optical length of the optical lens, and Imgh is a maximum image height of the optical lens.

In the above optical lens, the third lens satisfies the following conditional expression (2):

-2＜(R3+R4)/(R3-R4)＜-1 (2)

wherein R3 is an object-side radius of curvature of the second lens, and R4 is an image-side radius of curvature of the second lens.

In the above optical lens, the first to seventh lenses satisfy the following conditional expression (3):

0.08＜D34/f＜0.15 (3)

where f is the whole focal length of the optical lens, and D34 is the distance between the third lens and the fourth lens on the optical axis.

In the above optical lens, the first to seventh lenses satisfy the following conditional expression (4):

Td/EPD＜2 (4)

wherein Td is a distance on an optical axis from an object side surface of the first lens to an image side surface of the seventh lens of the optical lens, and EPD is an entrance pupil aperture of the optical lens.

In the above optical lens, the first to seventh lenses satisfy the following conditional expression (5):

0.7＜f/f123＜1 (5)

where f is a whole group focal length value of the optical lens, and f123 is a combined focal length value of the first lens, the second lens, and the third lens.

In the above optical lens, the first lens, the second lens and the third lens constitute a first lens group, and the first lens group has positive refractive power; the fourth lens, the fifth lens, the sixth lens and the seventh lens form a second lens group, and the second lens group has negative focal power.

According to another aspect of the present invention, there is provided a lens module including an optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal, the optical lens including, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a negative optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and, a seventh lens having a negative optical power; wherein the aperture of the optical lens is smaller than 1.65 and the optical length of the optical lens is smaller than 5 mm.

In the lens module, the first lens element is a meniscus lens element convex toward the object side, and the object side surface of the first lens element is a convex surface and the image side surface of the first lens element is a concave surface; the second lens is a meniscus lens convex to the object side, the object side of the second lens is convex, and the image side of the second lens is concave; the third lens is a meniscus lens convex to the object side, the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface; the fourth lens is a meniscus lens convex to the image side, the object side of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface; the fifth lens is a meniscus lens convex to the object side, and the object side surface of the fifth lens is convex and the image side surface of the fifth lens is concave; the sixth lens element is a biconvex lens element, and has a convex object-side surface and a convex image-side surface; and, the seventh lens is a biconcave lens, the object side surface of which is concave and the image side surface of which is concave.

In the above lens module, the fourth lens has a positive focal power, or the fourth lens has a negative focal power.

In the above lens module, the first to seventh lenses satisfy the following conditional expression (1):

TTL/Imgh＜1.6 (1)

In the above lens module, the third lens satisfies the following conditional expression (2):

-2＜(R3+R4)/(R3-R4)＜-1 (2)

In the above lens module, the first to seventh lenses satisfy the following conditional expression (3):

0.08＜D34/f＜0.15 (3)

where f is the whole group focal length value of the optical lens, and D34 is the distance between the third lens and the fourth lens on the optical axis.

In the above lens module, the first to seventh lenses satisfy the following conditional expression (4):

Td/EPD＜2 (4)

In the above lens module, the first to seventh lenses satisfy the following conditional expression (5):

0.7＜f/f123＜1 (5)

In the lens module, the first lens, the second lens and the third lens form a first lens group, and the first lens group has positive focal power; the fourth lens, the fifth lens, the sixth lens and the seventh lens form a second lens group, and the second lens group has negative focal power.

In the above lens module, further comprising: a first group monomer including the first lens group; a second group of monomers including the second lens group; and at least one assembling structure preset between the first group of single bodies and the second group of single bodies, wherein the first group of single bodies and the second group of single bodies are mutually assembled through the assembling structure so as to restrict relative assembling positions.

In the lens module, the first group of single bodies further includes a first bearing member, and the first lens, the second lens and the third lens are mounted on the first bearing member; the second group of single bodies further comprises a second bearing part, and the fourth lens, the fifth lens, the sixth lens and the seventh lens are mounted on the second bearing part; and the first bearing part and the second bearing part are mutually assembled through the assembling structure.

In the lens module, the first group of single bodies further includes at least one first spacer disposed in cooperation with the first lens, the second lens and the third lens to provide a predetermined light path; and the second group of single bodies further comprises at least one second space ring which is matched with the fourth lens, the fifth lens, the sixth lens and the seventh lens to provide a preset light path.

In the lens module, the first group of single bodies and the second group of single bodies are assembled in an active calibration manner.

The optical lens and the lens module provided by the invention can realize the optical lens and the lens module with a large aperture while keeping the miniaturization of the lens through the optimized setting of the focal power of the lens.

Drawings

Fig. 1 illustrates a lens configuration of an optical lens according to a first embodiment of the present invention.

Fig. 2 illustrates a lens configuration of an optical lens according to a second embodiment of the present invention.

Fig. 3 illustrates a lens configuration of an optical lens according to a third embodiment of the present invention.

Fig. 4 is a schematic block diagram of an image forming apparatus according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a multi-group lens according to an embodiment of the invention.

Fig. 6 is a schematic diagram of an upper group unit of a multi-group lens according to an embodiment of the invention.

Fig. 7 is a schematic diagram of a lower group of single lenses of a multi-group lens according to an embodiment of the invention.

Fig. 8 is a partially enlarged view of a position a in fig. 5.

FIG. 9 is a schematic diagram of an assembly process of the upper group of monomers according to an embodiment of the present invention.

FIG. 10 is a schematic diagram of a group-down cell assembly process according to an embodiment of the present invention.

Fig. 11 is a schematic view of a multi-group lens assembled by an upper group of single lenses and a lower group of single lenses according to an embodiment of the invention.

Fig. 12A and 12B are schematic diagrams illustrating effects of a multi-group arrangement of lenses according to an embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The underlying principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

The terms and words used in the following specification and claims are not limited to the literal meanings, but are used only by the inventors to enable a clear and consistent understanding of the invention. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

Terms used herein, including technical and scientific terms, have the same meaning as terms commonly understood by one of ordinary skill in the art, unless otherwise defined. It will be understood that terms, which are defined in commonly used dictionaries, have a meaning that is consistent with their meaning in the context of the present art.

The invention is described in further detail below with reference to the following figures and embodiments:

[ arrangement of optical lens ]

According to the optical lens of the embodiment of the present invention, the optical lens includes, in order from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative focal power; a third lens having a positive refractive power; a fourth lens; a fifth lens having a negative focal power; a sixth lens having a positive refractive power; and a seventh lens having a negative power; the aperture Fno of the optical lens is smaller than 1.65, and the optical length TIL of the optical lens is smaller than 5 mm.

In this way, the aperture Fno of the optical lens according to the embodiment of the present invention is less than 1.65, so that the blurring of the background of the imaging object is easily achieved, and the imaging quality in a low-light environment is improved. Also, since the optical length TIL of the optical lens is less than 5 mm, miniaturization of the optical lens can be maintained while satisfying high pixels.

Here, as those skilled in the art can understand, since the power itself has a certain relationship with the lens shape, by adjusting the powers of the first lens to the seventh lens so that the aperture Fno of the optical lens is less than 1.65 and the optical length TTL of the optical lens is less than 5 mm, a large aperture optical lens satisfying a slim design can be obtained.

Preferably, in an optical lens according to an embodiment of the present invention, the first lens is a meniscus lens convex toward the object side, the object side of which is convex, and the image side of which is concave; the second lens is a meniscus lens convex to the object side, the object side of the second lens is convex, and the image side of the second lens is concave; the third lens is a meniscus lens convex to the object side, the object side of the third lens is convex, and the image side of the third lens is concave; the fourth lens is a meniscus lens convex to the image side, the object side of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface; the fifth lens is a meniscus lens convex to the object side, and the object side surface of the fifth lens is convex and the image side surface of the fifth lens is concave; the sixth lens element is a biconvex lens element, the object-side surface of which is convex and the image-side surface of which is convex; the seventh lens element is a biconcave lens element having a concave object-side surface and a concave image-side surface.

Also, in the optical lens according to the embodiment of the present invention, the power of the fourth lens is not particularly limited, that is, the fourth lens may have positive power or may have negative power.

Preferably, in the optical lens barrel according to the embodiment of the present invention, the first lens to the seventh lens are all aspherical lenses.

Here, as can be understood by those skilled in the art, while adjusting the optical power, the shape of the lens and the pitch of the lens are changed accordingly. Accordingly, the overall lens parameters of the optical lens according to the embodiment of the present invention can also be realized by setting the power to match the lens shape and the lens pitch, but the lens shape is not limited to the above shape, but may have a certain (preferably small) variation. Thus, by adjusting the shape of the lens and adjusting the distance between the lenses, miniaturization and large aperture of the optical lens can be realized. However, embodiments of the present invention are not intended to unnecessarily limit the lens shape and the lens pitch.

Preferably, in the above optical lens, the first lens to the seventh lens satisfy the following conditional expression (1):

TTL/Imgh＜1.6 (1)

wherein, TTL is an optical length of the optical lens, that is, a distance from an outermost point of the object side of the first lens element to the imaging focal plane, and Imgh is a maximum image height of the optical lens.

Thus, by satisfying the above conditional expression (1), it is possible to satisfy the thin design requirement of the optical lens while maintaining the miniaturization of the optical system.

Preferably, in the above optical lens, the second lens satisfies the following conditional expression (2):

-2＜(R3+R4)/(R3-R4)＜-1 (2)

In this way, by satisfying the above conditional expression (2), the aberration of the optical system can be effectively reduced.

Preferably, in the above optical lens, the first to seventh lenses satisfy the following conditional expression (3):

0.08＜D34/f＜0.15 (3)

Thus, by satisfying the above conditional expression (3), astigmatism and curvature of field can be corrected while controlling the CRA range, resulting in an optical system having good imaging performance.

Preferably, in the above optical lens, the first lens to the seventh lens satisfy the following conditional expression (4):

Td/EPD＜2 (4)

where Td is a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens, and EPD is an entrance pupil diameter of the optical lens.

In this way, by satisfying the above conditional expression (4), it is possible to increase the light entering amount of the optical system and maintain the miniaturization thereof.

Preferably, in the above optical lens, the first lens to the seventh lens satisfy the following conditional expression (5):

0.7＜f/f123＜1 (5)

wherein f is a focal length value of the entire group of the optical lens, and f123 is a combined focal length value of the first lens, the second lens, and the third lens.

In this way, by satisfying the above conditional expression (5), it is possible to appropriately equalize the refractive powers of the first group consisting of the first lens element to the third lens element, further correct the aberration of the optical system, and contribute to shortening the system back focal length and maintaining the system miniaturization.

In the optical lens, the first lens, the second lens and the third lens form a first lens group, and the first lens group has positive focal power; the fourth lens, the fifth lens, the sixth lens and the seventh lens form a second lens group, and the second lens group has negative focal power.

That is, in the optical lens barrel according to the embodiment of the present invention, the first lens to the seventh lens are provided as two lens groups, which will be described further below with respect to a portion of the lens module.

It will be understood by those skilled in the art that, in the case of an optical lens according to the present invention having such a configuration of two lens groups, D34 in the above-described conditional expression (3) refers to the distance on the optical axis between the first lens group and the second lens group. And, the above conditional expression (5) is for appropriately equalizing refractive power of the first lens group.

[ numerical example of optical lens ]

Hereinafter, specific embodiments and numerical examples of an optical lens according to an embodiment of the present invention, in which specific numerical values are applied to the respective embodiments, will be described with reference to the drawings and tables.

The lens used in the embodiment has an aspherical lens surface, and the aspherical surface shape is represented by the following expression (6):

wherein, when the aspheric surface is at a position of height h along the optical axis direction, Z (h) is a distance rise from the vertex of the aspheric surface.

c =1/r, r denotes the radius of curvature of the lens surface, k is the conic coefficient, A, B, C, D, E, F and G are the high-order aspheric coefficients, e in the coefficients represents the scientific notation, e-05 denotes 10 ^-5 。

In addition, nd denotes a refractive index, and Vd denotes an abbe coefficient.

First embodiment

Fig. 1 is a schematic view showing an optical lens according to a first embodiment of the present invention. As shown in fig. 1, the optical lens according to the first embodiment of the present invention includes, in order from an object side to an image side: an aperture stop STO; a meniscus-shaped first lens L1 having positive optical power, having a first surface S2 convex toward the object side and a second surface S3 concave toward the image side; a meniscus-shaped second lens L2 having a negative power, having a first surface S4 convex toward the object side and a second surface S5 concave toward the image side; a meniscus-shaped third lens L3 having positive power, having a first surface S6 convex toward the object side and a second surface S7 concave toward the image side; a fourth lens L4 having a first surface S8 concave toward the object side and a second surface S9 convex toward the image side; a meniscus-shaped fifth lens L5 having a negative power, having a first surface S10 convex toward the object side and a second surface S11 concave toward the image side; a biconvex sixth lens L6 having positive optical power, having a first surface S12 convex to the object side and a second surface S13 convex to the image side; a seventh lens L7 of a biconcave shape having a negative power, having a first surface S14 concave to the object side and a second surface S15 concave to the image side; a planar lens L8 having a first surface S16 toward the object side and a second surface S17 toward the image side, typically a protective glass, for protecting an image plane; l9 has an imaging plane IMA.

The lens data of the above lens is shown in the following table 1:

[ TABLE 1 ]

Surface of	Radius of the pipe	Thickness of	Nd	Vd
					STO	Unlimited in size	-0.426
2	1.885	0.562	1.544	56.114
					3	5.721	0.050
4	3.777	0.250	1.661	20.376
					5	2.002	0.234
6	2.320	0.468	1.544	56.114
					7	6.479	0.512
8	-4.924	0.242	1.544	56.114
					9	-2.895	0.049
10	2.610	0.288	1.651	21.516
					11	1.978	0.429
12	12.143	0.426	1.544	56.114
					13	-2.055	0.152
14	-8.937	0.350	1.531	55.745
					15	1.426	0.180
16	Infinite number of elements	0.300	1.517	64.167
					17	Infinite number of elements	0.506
IMA	Infinite number of elements

The conic coefficients k and high-order aspherical coefficients A, B, C, D, E, F and G of the first surface S2 and the second surface S3 of the first lens, the first surface S4 and the second surface S5 of the second lens, the first surface S6 and the second surface S7 of the third lens, the first surface S8 and the second surface S9 of the fourth lens, the first surface S10 and the second surface S11 of the fifth lens, the first surface S12 and the second surface S13 of the sixth lens, and the first surface S14 and the second surface S15 of the seventh lens are as shown in table 2 below.

[ TABLE 2 ]

In the optical lens according to the first embodiment of the present invention, the relationship between the aperture Fno of the optical lens, the optical length TTL of the optical lens and the maximum image height Imgh of the optical lens and the like, the relationship between the object-side surface curvature radius R3 and the image-side surface curvature radius R4 of the second lens and the like, the relationship between D34 and the entire group focal length value f of the optical lens and the like, the relationship between the distance Td on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens and the entrance pupil aperture EPD of the optical system and the like, and the relationship between the entire group focal length value f of the optical lens and the combined focal length value f123 of the first lens to the third lens and the like are shown in table 3 below.

[ TABLE 3 ]

Fno	1.55
		TTL	4.99
Imgh	3.143
		D34	0.512
f	4.08
		TD	4.01
EPD	2.63
		f123	4.69
TTL/Imgh＜1.6	1.59
		0.7＜f/f123＜1	0.87
2＜(R3+R4)/(R3-R4)＜4	3.3
		0.08＜D34/f＜0.15	0.13
Td/EPD＜2	1.52

As can be seen from table 3 above, the optical lens according to the first embodiment of the present invention satisfies the aforementioned conditional expressions (1) to (5), thereby achieving a large aperture while shortening TTL and obtaining a high-pixel optical lens with high portability.

Second embodiment

Fig. 2 is a schematic view showing an optical lens according to a second embodiment of the present invention. As shown in fig. 2, the optical lens according to the second embodiment of the present invention includes, in order from an object side to an image side: an aperture stop STO; a meniscus-shaped first lens L1 having positive power, having a first surface S2 convex toward the object side and a second surface S3 concave toward the image side; a meniscus-shaped second lens L2 having a negative power, having a first surface S4 convex toward the object side and a second surface S5 concave toward the image side; a meniscus-shaped third lens L3 having positive optical power, having a first surface S6 convex toward the object side and a second surface S7 concave toward the image side; a fourth lens L4 having a first surface S8 concave to the object side and a second surface S9 convex to the image side; a meniscus-shaped fifth lens L5 having a negative power, having a first surface S10 convex toward the object side and a second surface S11 concave toward the image side; a biconvex sixth lens L6 having positive optical power, having a first surface S12 convex to the object side and a second surface S13 convex to the image side; a seventh lens L7 of a biconcave shape having a negative power, having a first surface S14 concave to the object side and a second surface S15 concave to the image side; a planar lens L8 having a first surface S16 facing the object side and a second surface S17 facing the image side, typically a protective glass, for protecting the image plane; l9 has an imaging plane IMA.

The lens data for the above lenses are shown in table 4 below:

[ TABLE 4 ]

Surface of	Radius of	Thickness of	Nd	Vd
					ST0	Infinite number of elements	-0.380
2	1.834	0.564	1.544	56.114
					3	4.241	0.030
4	3.476	0.250	1.661	20.376
					5	2.013	0.162
6	2.417	0.547	1.544	56.114
					7	10.902	0.518
8	48.256	0.307	1.544	56.114
					9	11.528	0.159
10	2.538	0.289	1.651	21.516
					11	2.611	0.259
12	2.989	0.391	1.544	56.114
					13	-6.869	0.246
14	-2.096	0.338	1.531	55.745
					15	5.102	0.100
16	Infinite number of elements	0.300	1.517	64.167
					17	Unlimited in size	0.522
IMA	Unlimited in size

The conic coefficients k and high-order aspherical coefficients A, B, C, D, E, F and G of the first surface S2 and the second surface S3 of the first lens, the first surface S4 and the second surface S5 of the second lens, the first surface S6 and the second surface S7 of the third lens, the first surface S8 and the second surface S9 of the fourth lens, the first surface S10 and the second surface S11 of the fifth lens, the first surface S12 and the second surface S13 of the sixth lens, and the first surface S14 and the second surface S15 of the seventh lens are shown in the following table 5.

[ TABLE 5 ]

In the optical lens according to the second embodiment of the present invention, the relationship between the aperture Fno of the optical lens, the optical length TTL of the optical lens and the maximum image height imageh of the optical lens and the relationship therebetween, the relationship between the object-side surface curvature radius R3 and the image-side surface curvature radius R4 of the second lens and the relationship therebetween, the relationship between D34 and the entire group focal length value F of the optical lens and the relationship therebetween, the relationship between the distance Td on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens and the entrance pupil aperture EPD of the optical system and the relationship therebetween, and the relationship between the entire group focal length value F of the optical lens and the combined focal length value F123 of the first lens to the third lens and the relationship therebetween are shown in table 6 below.

[ TABLE 6 ]

Fno	1.65
		TTL	4.98
Imgh	3.261
		D34	0.518
f	4.15
		TD	4.06
EPD	2.52
		f123	4.41
TTL/Imgh＜1.6	1.53
		0.7＜f/f123＜1	0.94
2＜(R3+R4)/(R3-R4)＜4	3.8
		0.08＜D34/f＜0.15	0.13
Td/EPD＜2	1.61

As can be seen from table 6 above, the optical lens according to the second embodiment of the present invention satisfies the aforementioned conditional expressions (1) to (5), thereby achieving a large aperture while shortening TTL and obtaining a high-pixel optical lens with high portability.

Third embodiment

Fig. 3 is a schematic view showing an optical lens according to a third embodiment of the present invention. As shown in fig. 3, the optical lens according to the second embodiment of the present invention, in order from an object side to an image side, comprises: an aperture stop STO; a meniscus-shaped first lens L1 having positive power, having a first surface S2 convex toward the object side and a second surface S3 concave toward the image side; a meniscus-shaped second lens L2 having a negative power, having a first surface S4 convex toward the object side and a second surface S5 concave toward the image side; a meniscus-shaped third lens L3 having positive optical power, having a first surface S6 convex toward the object side and a second surface S7 concave toward the image side; a fourth lens L4 having a first surface S8 concave toward the object side and a second surface S9 convex toward the image side; a meniscus-shaped fifth lens L5 having a negative power, having a first surface S10 convex toward the object side and a second surface S11 concave toward the image side; a biconvex sixth lens L6 having positive optical power, having a first surface S12 convex to the object side and a second surface S13 convex to the image side; a seventh lens L7 of a biconcave shape having a negative power, having a first surface S14 concave to the object side and a second surface S15 concave to the image side; a planar lens L8 having a first surface S16 facing the object side and a second surface S17 facing the image side, typically a protective glass, for protecting the image plane; l9 has an imaging plane IMA.

The lens data of the above lens are shown in table 7 below:

[ TABLE 7 ]

The conic coefficients k and high-order aspherical coefficients A, B, C, D, E, F and G of the first surface S2 and the second surface S3 of the first lens, the first surface S4 and the second surface S5 of the second lens, the first surface S6 and the second surface S7 of the third lens, the first surface S8 and the second surface S9 of the fourth lens, the first surface S10 and the second surface S11 of the fifth lens, the first surface S12 and the second surface S13 of the sixth lens, and the first surface S14 and the second surface S15 of the seventh lens are as shown in the following table 8.

[ TABLE 8 ]

In the optical lens according to the second embodiment of the present invention, the relationship between the aperture Fno of the optical lens, the optical length TTL of the optical lens and the maximum image height imageh of the optical lens and the relationship therebetween, the relationship between the object-side surface curvature radius R3 and the image-side surface curvature radius R4 of the second lens and the relationship therebetween, the relationship between D34 and the entire group focal length value F of the optical lens and the relationship therebetween, the relationship between the distance Td on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens and the entrance pupil aperture EPD of the optical system and the relationship therebetween, and the relationship between the entire group focal length value F of the optical lens and the combined focal length value F123 of the first lens to the third lens and the relationship therebetween are shown in table 9 below.

[ TABLE 9 ]

Fno	1.58
		TTL	4.97
Imgh	3.143
		D34	0.55
f	4.07
		TD	4.25
EPD	2.57
		f123	4.57
TTL/Imgh＜1.6	1.58
		0.7＜f/f123＜1	0.89
2＜(R3+R4)/(R3-R4)＜4	2.95
		0.08＜D34/f＜0.15	0.14
Td/EPD＜2	1.65

As can be seen from table 9 above, the optical lens according to the third embodiment of the present invention satisfies the aforementioned conditional expressions (1) to (5), thereby achieving a large aperture while shortening TTL and obtaining a high-pixel optical lens with high portability.

In the optical lens according to the embodiment of the invention, by setting the powers of the first lens to the seventh lens in the optical lens so that the aperture Fno of the optical lens is less than 1.65 and the optical length TTL of the optical lens is less than 5 mm, a large aperture optical lens satisfying a slim design can be obtained.

In the optical lens according to the embodiment of the invention, the ratio of the optical length TTL of the optical lens to the maximum image height of the optical lens is less than 1.6 by setting the focal powers of the first lens to the seventh lens in the optical lens, so that the miniaturization of an optical system can be maintained, and the thin design requirement of the optical lens can be met.

In the optical lens according to the embodiment of the present invention, by setting the object side curvature radius R3 and the image side curvature radius R4 of the second lens so as to satisfy 2 < (R3 + R4)/(R3-R4) < 4, the aberration of the optical system can be effectively reduced.

In the optical lens according to the embodiment of the invention, by setting the focal powers of the first lens to the seventh lens in the optical lens so that the ratio between D34 and the whole group focal length value F of the optical lens is greater than 0.08 and less than 0.15, astigmatism and curvature of field can be corrected while controlling the CRA range, and good imaging performance of the optical lens can be obtained.

In the optical lens according to the embodiment of the present invention, by setting the optical powers of the first lens to the seventh lens in the optical lens so that the ratio between the distance Td on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens to the entrance pupil aperture EPD of the optical system is less than 2, the amount of light entering the optical lens can be increased and the miniaturization thereof can be maintained.

[ arrangement of lens Module ]

According to another aspect of the embodiments of the present invention, there is provided a lens module including an optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal, the optical lens including, in order from an object side to an image side: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens; a fifth lens having a negative optical power; a sixth lens having positive optical power; and, a seventh lens having a negative optical power; wherein, the aperture of the optical lens is less than 1.65 and the optical length of the optical lens is less than 5 mm.

Fig. 4 is a schematic block diagram of an image forming apparatus according to an embodiment of the present invention. As shown in fig. 4, an imaging apparatus 100 according to an embodiment of the present invention includes an optical lens 101 and an imaging element 102. The optical lens 101 is used for capturing an optical image of a subject, and the imaging element 102 is used for converting the optical image picked up by the optical lens 101 into an electrical signal.

In the lens module, the first lens element is a meniscus lens element convex toward the object side, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens is a meniscus lens convex to the object side, the object side of the second lens is convex, and the image side of the second lens is concave; the third lens is a meniscus lens convex to the object side, the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface; the fourth lens is a meniscus lens convex to the image side, the object side of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface; the fifth lens is a meniscus lens convex to the object side, and the object side surface of the fifth lens is convex and the image side surface of the fifth lens is concave; the sixth lens element is a biconvex lens element, and has a convex object-side surface and a convex image-side surface; and, the seventh lens is a biconcave lens, the object side surface of which is concave and the image side surface of which is concave.

In the lens module, the fourth lens has positive focal power or negative focal power.

TTL/Imgh＜1.6 (1)

wherein TTL is the optical length of the optical lens, and Imgh is the maximum image height of the optical lens.

In the above lens module, the second lens satisfies the following conditional expression (2):

-2＜(R3+R4)/(R3-R4)＜-1 (2)

wherein R3 is an object-side radius of curvature of the second lens element, and R4 is an image-side radius of curvature of the second lens element.

0.08＜D34/f＜0.15 (3)

Td/EPD＜2 (4)

where Td is a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens of the optical lens, and EPD is an entrance pupil aperture of the optical lens.

0.7＜f/f123＜1 (5)

where f is a focal length value of the entire group of the optical lens, and f123 is a combined focal length value of the first lens, the second lens, and the third lens.

Here, it can be understood by those skilled in the art that other details of the optical lens in the imaging apparatus according to the embodiment of the present invention are the same as those described above with respect to the optical lens according to the embodiment of the present invention, and the aforementioned numerical examples of the optical lens according to the first embodiment to the second embodiment of the present invention may be adopted, and thus, no trace is made to avoid redundancy.

According to the optical lens and the lens module of the embodiment of the invention, the focal powers of the first lens to the seventh lens in the optical lens are set so that the aperture Fno of the optical lens is less than 1.65 and the optical length TTL of the optical lens is less than 5 mm, and the large-aperture optical lens meeting the thin design can be obtained.

According to the optical lens and the lens module, the ratio of the optical length TTL of the optical lens to the maximum image height of the optical lens is smaller than 1.6 by setting the focal powers of the first lens to the seventh lens in the optical lens, so that the miniaturization of an optical system can be maintained, and the thin design requirement of the optical lens is met.

According to the optical lens and the lens module, the object side curvature radius R3 and the image side curvature radius R4 of the second lens are set, so that the condition that-2 < (R3 + R4)/(R3-R4) < -1 is met, and the aberration of an optical system can be effectively reduced.

According to the optical lens and the lens module, the focal power of the first lens to the seventh lens in the optical lens is set, so that the ratio of the focal length value F of the whole group of the optical lens to the focal length value D34 is larger than 0.08 and smaller than 0.15, astigmatism and curvature of field can be corrected while the range of the CRA is controlled, and good imaging performance of the optical lens is obtained.

According to the optical lens and the lens module of the embodiment of the invention, the optical powers of the first lens to the seventh lens in the optical lens are set, so that the ratio of the distance Td between the object side surface of the first lens and the image side surface of the seventh lens on the optical axis to the entrance pupil aperture EPD of the optical system is less than 2, the light entering amount of the optical lens can be increased, and the miniaturization of the optical lens can be maintained.

According to the optical lens and the lens module of the embodiment of the invention, the focal powers of the first lens element to the seventh lens element in the optical lens are set, so that the ratio of the whole focal length of the optical lens to the combined focal length of the first lens element to the third lens element is greater than 0.7 and less than 1, the refractive power of the first group consisting of the first lens element to the third lens element can be properly balanced, the aberration of the optical system can be further corrected, the system back focal length can be shortened, and the system miniaturization can be maintained.

In the optical lens and the lens module according to the embodiment of the present invention, a lens having substantially no lens power may also be arranged. Therefore, in addition to the first to seventh lenses described above, additional lenses may be arranged. In this case, the optical lens and the imaging apparatus according to the embodiment of the present invention may be configured with seven or more lenses, and these lenses include additional lenses arranged in addition to the above-described first to seventh lenses.

[ multiple group arrangement of lenses ]

As described above, in the optical lens and the lens module according to the embodiments of the present invention, seven or more lenses may be arranged. For these lenses, ensuring the coincidence of the optical axes, i.e., the central axes of the respective lenses, and the central axes of the photosensitive chips is the basis for ensuring good imaging quality. For a conventional optical lens, a plurality of lenses are usually assembled in a lens barrel one by one, and a certain error exists when each lens and lens barrel are assembled inevitably in the assembling process. Finally, an accumulated error is formed by assembling the whole lens and the lens barrel, namely the assembling error of a single optical lens. Therefore, it can be easily understood that the larger the number of lenses, the larger the accumulated error, the lower the quality of the whole lens, and the lower the yield in the lens production process.

On the other hand, for the conventional lens barrel, a plurality of lenses are assembled in the same lens barrel, the relative positions of the lenses are basically determined, adjustment cannot be performed, and once the lenses are assembled in the lens barrel, the quality of the lens is determined, which also makes the requirements on the machining precision of the lens barrel and the lenses higher.

It is worth mentioning that as the number of lenses increases, the more serious the problems due to the lens become.

It is also worth mentioning that the lens of the optical lens and the assembling relationship between the lens and the lens barrel directly affect the quality of the optical lens, and the size of the lens module, especially the lens module applied to some smart devices, such as smart phones, is relatively small, so how to combine the existing device requirements, make full use of the structure of the optical lens, and the research of the optical lens suitable for practical production and application is also an aspect to be considered.

In view of the above problems, embodiments of the present invention provide a multi-group lens, that is, a multi-group lens is provided, and a plurality of group monomers are assembled to form an integral lens, so that the number of lenses in each group monomer is small, and the assembly error of each group monomer is small, but the total number of lenses of the multi-group lens formed by each group monomer is large, so that a higher pixel can be provided, and the accumulated error is small. In the process of assembling the multiple groups of single bodies to form the multiple groups of lenses, the multiple groups of single bodies can be assembled by adopting an Active Alignment (AA) mode, so that the relative error among the single bodies of each group is reduced, and the multiple groups of lenses have better optical consistency.

In addition, the group single bodies are assembled together through an assembly structure, for example, the group single bodies are assembled in a mutually embedded mode, so that the group single bodies are stably assembled to form the multi-group lens. Specifically, the embedding manner can prevent external stray light from entering the multi-group lens, so as to avoid interference with the optical system of the multi-group lens. In addition, in some examples, each group of monomers can be fixed by a rapidly molded bonding medium, such as UV thermosetting adhesive, and the assembly structure can provide a sufficient ultraviolet irradiation area for the bonding medium, so that each group of monomers can be rapidly and stably assembled and fixed, thereby improving the production efficiency.

Referring to fig. 5 to 11, there is shown a multi-cluster lens 100 according to a preferred embodiment of the present invention. The multi-group lens 100 includes a plurality of group units 10 and at least one assembly structure 20, the assembly structure 20 is pre-disposed on each group unit 10, and two adjacent group units 10 are mutually matched and assembled through the assembly structure 20.

For convenience of illustration, in this embodiment of the present invention, the multi-group lens 100 is formed by two group monomers 10, but in other embodiments of the present invention, the multi-group lens 100 may include more group monomers 10, such as three or more, and the present invention is not limited in this respect.

Furthermore, although it is shown in the embodiment that the two grouped units 10 are fitted and assembled with each other by the assembly structure 20, the two grouped units 10 may be mounted together by other types of assembly structures 20 or adhered together by, for example, an adhesive in a gel, and therefore, the present invention is not intended to limit the specific assembly structure between the two grouped units 10.

As shown, the multi-group lens 100 includes two group units 10, an upper group unit 11 and a lower group unit 12. The upper group of cells 11 and the lower group of cells 12 are assembled by the assembly structure 20.

The upper group of single cells 11 includes a plurality of upper lenses 111 and an upper bearing part 112, and each upper lens 111 is sequentially arranged in the upper bearing part 112 according to the light path.

The lower group of cells 12 includes a plurality of lower lenses 121 and a lower carrier 122, and each of the lower lenses 121 is sequentially arranged in the lower carrier 122 along a light path.

Further, in this embodiment of the present invention, the upper bearing part 112 of the upper group unit 11 includes an upper bearing main body 1121 and an extending wall 1122. The upper carrier body 1121 is a hollow structure for receiving, mounting and positioning the lenses along the path of light. In other words, each upper lens 111 of the upper group unit 11 is mounted inside the upper bearing body 1121 so as to provide a light path. The extension wall 1122 extends outward from the upper bearing body 1121 to facilitate overlapping with the upper bearing member 112 of the lower group unit 12.

More specifically, the extension wall 1122 integrally extends outward from the outside of the upper carrier body 1121. In some embodiments, the extension wall 1122 may be an annular extension wall extending outward from the upper bearing body 1121 to form an annular visor structure, so that the lower bearing part 122 of the lower group unit 12 is stably lapped by the visor structure to provide stable support for the upper group unit 11.

The upper supporting body 1121 of the upper supporting member 112 of the upper group unit 11 has a lower receiving end 11211 located below the extending wall 1122, and the lower receiving end 11211 is received by the lower supporting member 122 of the lower group unit 12. In other words, the extension wall 1122 of the upper bearing member 112 of the upper grouped unit 11 divides the upper bearing body 1121 into two portions, an upper portion and a lower portion, and the lower portion is the lower connection end 11211. When the extending wall 1122 of the upper bearing member 112 of the upper group of cells 11 is overlapped with the lower bearing member 122 of the lower group of cells 12, the lower mating end 11211 is mated with the lower bearing member 122 of the lower group of cells 12.

The lower bearing member 122 of the lower group of cells 12 includes a lower bearing body 1221 and an upper overlapping end 1222. The lower bearing body 1221 is a hollow structure to accommodate, mount, and arrange the lower lenses 121 along the light path. In other words, each lower lens 121 of the lower group of single bodies 12 is mounted inside the lower bearing body 1221 so as to provide a light path. The upper landing end 1222 is integrally connected to the lower bearing body 1221 so as to engage the upper bearing component 112 of the upper group cell 11, such that when the extension wall 1122 of the upper bearing component is landed on the upper landing end 1222 of the lower bearing component 122, the lower landing end 11211 of the upper bearing component 112 of the upper group cell 11 extends into the upper landing end 1222 of the lower bearing component 122, such that the lower bearing component 122 of the lower group cell 12 constrains the mounting position of the upper group cell 11.

In other words, in this embodiment of the present invention, the extension wall 1122 and the upper overlapping end 1222 form an assembling structure 20 to telescopically assemble the upper group unit 11 and the lower group unit 12.

The upper overlapping end 1222 is a hollow structure extending inwardly to provide an overlapping support position for the upper array of cells 11 and to provide a light path for each lower lens 121 located in the lower bearing body 1221.

Further, in this embodiment of the present invention, the extending wall 1122 of the upper bearing member 112 of the upper grouped unit 11 has a lower fitting groove 11221 forming a lower fitting leg 11222 extending downward; the upper overlapping end 1222 of the lower bearing part 122 of the lower single unit group 12 is provided with an upper fitting groove 12221 forming at least one upper fitting leg 11222 so as to match the lower fitting groove 11221 and the lower fitting leg 11222 of the extension wall 1122 of the upper bearing part 112 of the upper single unit group 11.

Specifically, when the upper single block 11 is overlapped with the lower single block 12, the extension wall 1122 of the upper bearing member 112 of the upper single block 11 is overlapped with the upper overlapping end 1222 of the lower bearing member 122 of the lower single block 12, the lower engaging leg 11222 of the extension wall 1122 extends to the upper engaging groove 12221 of the upper overlapping end 1222, and the engaging leg of the upper overlapping end 1222 extends to the lower engaging groove 11221 of the extension wall 1122, so that the extension wall 1122 and the upper overlapping end 1222 are overlapped in an engaging manner.

According to this embodiment of the present invention, the upper overlapping end 1222 includes two upper

fitting legs

12222, 12223, one of which is located inside and the other of which is located outside, and which are spaced apart to form an upper fitting groove 12221.

In other words, the two upper

fitting legs

12222, 12223 of the upper overlapping end 1222 of the lower bearing part 122 of the lower group unit 12 are respectively protruded upward to form the upper fitting groove 12221. One of the two

fitting legs

12222, 12223 is located at the inner side, and the other is located at the outer side, so as to respectively limit the lower fitting leg 11222 in two directions, and the fitting leg 12222 located at the inner side can block external light from entering the inside of the multi-group lens 100 because it extends towards the lower fitting groove 11221 of the extending wall 1122. The extension leg 1222 located at the inner side is located at the outer side of the lower nesting end 11211 of the upper bearing body 1121 of the upper bearing part 112 of the upper grouped unit 11, restrains the lower nesting end 11211, and cooperates with the lower nesting end 11211 to block external light from entering the interior. In this embodiment of the present invention, the lower fitting groove 11221 and the lower fitting leg 11222 of the extension wall 1122, and the upper fitting groove 12221 and the upper fitting leg 12222 of the upper overlapping end 1222 constitute the assembly structure 20, and the assembly structure 20 is respectively disposed on the upper bearing member 112 and the lower bearing member 122, so that the upper single cell group 11 and the lower single cell group 12 are stably assembled in a fitting and fitting manner. In this embodiment of the present invention, the lower fitting groove 11221 of the extension wall 1122 forms an annular structure, the lower fitting leg 11222 forms an annular structure, the two upper

fitting legs

12222, 12223 form an annular structure, and the upper fitting groove 12221 forms an annular structure, so as to be fitted to each other for assembly.

When the upper group unit 11 and the lower group unit 12 are fixed, the upper fitting groove 12221 accommodates an adhesive medium 13, such as UV glue, thermosetting glue, UV thermosetting glue, or the like, therein so as to stably fix the upper group unit 11 and the lower group unit 12. The two

upper legs

12222, 12223 of the upper overlapping end 1222 project upward to block the flow of the adhesive medium 13 to the inside or outside, thereby preventing the adhesive medium 13 from contaminating the inside lens or affecting the overall appearance. Of course, in other embodiments of the present invention, the upper group of single cells 11 and the lower group of single cells 12 may be fixed by other methods, such as thermal welding, ultrasonic welding, laser welding, etc., and the present invention is not limited in this respect.

Further, it is preferable that the tip of the fitting leg 12223 positioned on the outer side is higher than the fitting leg 12222 positioned on the inner side, so that the adhesive medium 13 contained in the upper fitting groove 12221 is prevented from overflowing to the outside to ensure a neat appearance. Of course, in other embodiments of the present invention, the height of the inner-located leg 12222 and the height of the outer-located leg 12223 may be the same or in other proportions, and the present invention is not limited in this respect.

It should be noted that, in actual production, part of the adhesive medium 13 in the upper fitting groove 12221 overflows to the surface of the inner upper fitting leg 12222, and when the gap between the extending wall 1122 and the inner upper fitting leg 12222 is smaller, the provided glue overflow gap is smaller, so that the adhesive medium 13 overflowing the surface of the upper fitting leg 12222 easily contacts the extending arm 1122 of the upper group of monomers 11, thereby hindering the relative movement of the upper group of monomers 11 and the lower group of monomers 12, for example, when the upper group of monomers 11 is actively calibrated, the upper group of monomers 11 may drive the lower group of monomers 12 to move, thereby affecting the effect of active calibration, whereas the arrangement of the lower fitting groove 11221 of the extending wall 1122 in this embodiment increases the gap between the upper fitting leg 12222 and the extending arm 1122, thereby enabling the active calibration to be performed more accurately.

Of course, in addition to the assembly structure 20, the two group units 10 may be fixed by, for example, simply overlapping, or the two group units 10 may be bonded by using an overlapping adhesive medium.

Further, referring to fig. 5, 6, and 9, the upper group of single cells 11 includes at least one spacer 113 disposed in cooperation with each of the upper lenses 111 so as to restrict light passing through the lenses 111 and provide a predetermined light path.

In this embodiment of the present invention, the upper group of single bodies 11 includes three upper lenses 111, which are a first upper lens 1111, a second upper lens 1112 and a third upper lens 1113. The first upper lens 1111, the second upper lens 1112 and the third upper lens 1113 are sequentially disposed in the upper bearing body 1121 of the upper bearing part 112 of the upper group unit 11 from top to bottom along the light path. In this embodiment, the upper group unit 11 includes two spacers 113 respectively disposed between the first upper lens 1111 and the second upper lens 1112, and between the second upper lens 1112 and the third upper lens 1113.

It should be noted that the spacer 113 may also be provided in other forms, such as a coating on the upper lens 111.

Referring to fig. 6, the lower sleeving end portion 11211 of the upper supporting body 1121 has at least one reinforcing fixing groove 112112 for receiving the adhesive medium 13, and reinforces and fixes the upper lens 111 located at the bottom end, such as the third upper lens 1113. The bonding medium 13 may be a UV glue, a thermosetting glue, a UV thermosetting glue, or the like. It is understood that the reinforcement fixing grooves 112112 correspond to the outermost upper lenses 111, for example, when there are two lenses in the upper supporting body 1121, the reinforcement fixes the second upper lens, and when there are four lenses in the upper supporting body 1121, the reinforcement fixes the fourth upper lens 1114.

Preferably, in some embodiments, the reinforcing fixing grooves 112112 are symmetrically distributed on the lower socket end 11211 of the upper bearing body 1121, so as to provide a uniform stress for the corresponding upper lens 111, and prevent the uneven acting force on the upper lens 111 when the bonding medium 13 is changed due to environmental influence, such as uneven stress when the bonding medium 13 expands due to heat.

The reinforcing fixing grooves 112112 can be designed into different shapes such as wedge, triangle, trapezoid, rectangle and the like according to requirements. The reinforcing fixing grooves 112112 may be separately spaced, or may be communicating grooves, that is, an integral annular groove may be formed, and the cross section of the annular groove may be different in shape.

Preferably, when designing the shape and size of the reinforcement-fixing groove 112112, the wall thickness of the lower socket end 11211 may be combined so that it can bear sufficient structural strength without being too thin.

Preferably, the depth of the reinforcement fixing groove 112112 is smaller than the thickness of the edge of the corresponding lens, so as to prevent a gap between the reinforcement fixing groove 112112 and the top surface edge of the lens, and to allow the glue to penetrate through the gap and enter the inside.

In this embodiment of the present invention and the accompanying drawings, the reinforcing fixing grooves 112112 are of a trapezoidal structure, and four reinforcing fixing grooves 112112 are symmetrically distributed. Of course, in other embodiments of the present invention, the reinforcement-fixing grooves 112112 may have other shapes and other numbers, such as three, five or more, etc., and the present invention is not limited in this respect.

Referring to fig. 9, the assembly process of the upper group of cells 11 according to the first preferred embodiment of the present invention is schematically illustrated. For example, the assembly process of the upper group of monomers 11 may be: firstly, the upper bearing part 112 of the upper group single body 11 is placed upside down on an assembly workbench surface, then the first lens 1111 is assembled at a corresponding position in the upper bearing part 112, then the spacing ring 113 is assembled therein, the second upper lens 1112, the other spacing ring 113 and the third upper lens 1113 are sequentially assembled, after the third upper lens 1113 is assembled, the bonding medium 13 is required to be applied into the reinforcement fixing groove 112112 for reinforcement and fixation of the third upper lens 1113, and therefore, the assembly of the upper group single body 11 is completed.

Further, in the first embodiment of the present invention, the lower group of monomers 12 includes three lower lenses 121, which are a first lower lens 1211, a second lower lens 1212 and a third lower lens 1213. The first lower lens 1211, the second lower lens 1212 and the third lower lens 1213 are sequentially arranged in the lower bearing body 1221 of the lower bearing member 122 of the lower group of single cells 12 from top to bottom along the light path.

It should be noted that, in the present invention, since the whole lens is composed of a plurality of group monomers 10, the number of lenses in each group monomer 10 may be relatively small, such as one, two, three, four, etc., and the number of lenses of the whole lens, i.e. the multi-group lens 100, is obtained by adding the number of lenses of each group monomer 10, so that the number is large, such as six, seven, eight, etc., thereby providing a lens with higher resolution, which is suitable for a high-pixel camera module, and in the assembling process, the optical axes of each group monomer 10 are consistent through automatic calibration between each group monomer 10, thereby reducing the accumulated error of the multi-group lens 100 and improving the imaging quality.

It should be noted that, for clarity, in this embodiment and the drawings of the present invention, the multi-group lens 100 composed of the upper group of three lenses 11 and the lower group of three lenses 12 is taken as an example for illustration, but in other embodiments of the present invention, the upper group of three lenses 11 may include other numbers of lenses, such as one, two, or more than three lenses. The lower group of cells 12 may include other numbers of lenses, such as one, two, or more than three. Each lens may be the same lens, or may be a different lens designed according to the requirements of the optical system.

In an embodiment of four lenses, the upper group of single lenses 11 includes four upper lenses 111, which are the first upper lens 1111, the second upper lens 1112, the third upper lens 1113 and a fourth upper lens 1114 respectively, where the relationship between the upper lenses 111 is similar to the structure of the three lenses, and is not repeated herein.

Further, referring to fig. 5, 7, and 10, the lower group of cells 12 includes at least one spacer 123 disposed in cooperation with the lower lens 121 so as to restrict light passing through the lens and provide a predetermined light path. In this embodiment of the present invention, the lower group of single bodies 12 includes three space rings 123 respectively disposed on the upper portion of the second lower lens 121, between the first lower lens 1211 and the second lower lens 1212, and between the second lower lens 1212 and the third lower lens 1213.

Fig. 10 is a schematic view of an assembly process of the lower group of cells 12 according to the first preferred embodiment of the present invention. In order to facilitate the stable assembly of the lower single unit 12, the present invention further provides an assembly fixture 500, which is matched with the structure of the upper overlapping end 1222 of the lower single unit 12, so that the lower bearing member 122 of the lower single unit 12 is stably supported. Further, the assembly jig 500 has a bearing protrusion 501 corresponding to the upper fitting groove 12221 of the upper overlapping end 1222 of the lower bearing member 122 of the lower group unit 12, so that when the lower bearing member 122 is placed upside down in the assembly jig 500, the bearing protrusion 501 is received in the upper fitting groove 12221, thereby supporting the lower bearing member 122 upside down and stably.

The bearing protrusion 501 may have an annular structure and is engaged with the annular upper engagement groove 12221. Of course, when the upper fitting groove 12221 has another structure, the receiving projection 501 may be provided in a corresponding mating structure.

For example, the assembly process of the following group of monomers 12 may be: the lower bearing member 122 of the lower group of single bodies 12 is first placed upside down in the assembling jig 500, then the spacer 113 is installed in the lower bearing member 122, then the first lower lens 121 is installed in the lower bearing member 122, and the spacer 113, the second lower lens 121, the spacer 113 and the third lower lens 121 are continuously assembled in sequence.

In some embodiments of the present invention, the lower end of the lower bearing part 122 of the lower group of single cells 12 may be provided with a reinforcement fixing groove 112112, so as to fix the corresponding lens, such as the third lower lens 121 located at the outermost side. Further, in the process of assembling the lower group unit 12, after the third lower lens 121 is pre-assembled, the adhesive medium 13 is applied to the reinforcing fixing groove to reinforce and fix the third lower lens 121.

After the upper group unit 11 and the lower group unit 12 are assembled, the multi-group lens 100 of this embodiment of the present invention can be obtained by assembling the upper group unit 11 and the lower group unit 12.

In another embodiment of the present invention, the multi-group lens 100 can be assembled by: the method comprises the steps of firstly, actively calibrating an upper group monomer 11 and a lower group monomer 12 to determine the relative positions of the upper group monomer 11 and the lower group monomer 12, further applying a bonding medium 13 to an upper embedding groove 12221 of the lower group monomer 12, further pre-fixing the upper group monomer 11 and the lower group monomer 12, such as carrying out ultraviolet irradiation, and finally fixing the upper group monomer 11 and the lower group monomer 12, such as fixing the upper group monomer 11 and the lower group monomer 12 by heating and baking.

That is, in the lens module according to the embodiment of the present invention, the lens module further includes: the first group of monomers comprises a first lens group; the second group monomer comprises a second lens group; and at least one assembling structure which is preset between the first group of monomers and the second group of monomers, and the first group of monomers and the second group of monomers are mutually assembled through the assembling structure so as to restrict relative assembling positions.

In the lens module, the first group of single bodies further includes a first bearing part, and the first lens, the second lens and the third lens are mounted on the first bearing part; the second group of single bodies further comprises a second bearing part, and a fourth lens, a fifth lens, a sixth lens and a seventh lens are arranged on the second bearing part; and the first bearing part and the second bearing part are mutually assembled through the assembling structure.

In the lens module, the first group of single bodies further comprises at least one first space ring which is matched with the first lens, the second lens and the third lens to provide a predetermined light path; and the second group of single bodies further comprises at least one second space ring which is matched with the fourth lens, the fifth lens, the sixth lens and the seventh lens to provide a preset light path.

In the lens module, the first group of single bodies and the second group of single bodies are assembled in an active calibration mode.

Fig. 12A and 12B are schematic diagrams illustrating effects of a multi-group arrangement of lenses according to an embodiment of the present invention. When the first lens, the second lens and the third lens form a first group of single bodies and the fourth lens, the fifth lens, the sixth lens and the seventh lens form a second group of single bodies, the first group of single bodies and the second group of single bodies are assembled respectively and then combined and calibrated in the actual production process, real-time adjustment and calibration among groups can be combined, and the product yield is remarkably improved.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A lens barrel characterized by comprising:

at least two group monomers, wherein the at least two group monomers comprise an upper group monomer and a lower group monomer, the upper group monomer comprises an upper bearing part, the lower group monomer comprises a lower bearing part,

the upper bearing part comprises an upper bearing main body and an extending wall, the extending wall extends outwards from the outside of the upper bearing main body, the extending wall is provided with a lower embedding groove to form a lower embedding leg extending downwards so as to be lapped on the lower bearing part of the lower group of monomers,

the lower bearing part comprises a lower bearing main body and an upper lapping end part, the upper lapping end part is integrally connected with the lower bearing main body, the upper lapping end part comprises two upper embedding legs, the two upper embedding legs respectively extend upwards to form upper embedding grooves so as to be matched with the lower embedding grooves and the lower embedding legs of the extending walls of the upper bearing parts of the upper group of monomers, one of the two upper embedding legs is positioned at the inner side of the upper lapping end part, the other one of the two upper embedding legs is positioned at the outer side of the upper lapping end part to respectively limit the lower embedding legs, the upper embedding legs positioned at the inner side of the upper lapping end part extend towards the lower embedding grooves of the extending walls, and the top ends of the upper embedding legs positioned at the outer side of the upper lapping end part are not lower than the upper embedding legs positioned at the inner side of the upper lapping end part,

the upper bearing main body is provided with a lower sleeving end part positioned below the extension wall, and the lower sleeving end part extends into the upper lapping end part of the lower bearing part of the lower group of single bodies;

at least one assembling structure, wherein the assembling structure is preset on the upper group of monomers and the lower group of monomers, and the adjacent upper group of monomers and the adjacent lower group of monomers are matched and assembled by the assembling structure after active calibration;

the upper group of single bodies and the lower group of single bodies are fixed through a bonding medium, and the bonding medium is accommodated in the upper embedding groove to stably fix the upper group of single bodies and the lower group of single bodies.

2. The lens barrel as claimed in claim 1, wherein the upper group unit further includes a plurality of upper lenses sequentially arranged in a ray path within the upper carrier member; the lower group of monomers also comprises a plurality of lower lenses which are sequentially arranged in the lower bearing part according to the light path.

3. The lens barrel according to claim 1, wherein the upper fitting legs and the upper fitting grooves are each of an annular structure.

4. The lens barrel as claimed in claim 1, wherein the adhesive medium is one or more of UV glue and thermosetting glue.

5. The lens barrel as claimed in claim 2, wherein the upper group of cells includes at least one spacer disposed in cooperation with the plurality of upper lenses so as to restrict light passing through the upper lenses.

6. The lens barrel as claimed in claim 5, wherein the spacer is provided to the upper lens by means of a coating.

7. The lens barrel as claimed in claim 2, wherein the lower socket end of the upper carrier body has at least one reinforcing fixing groove for receiving the adhesive medium, the reinforcing fixing groove fixing the upper lens at the bottom end.

8. The lens barrel according to claim 7, wherein the reinforcement fixing groove is wedge-shaped, triangular, trapezoidal, or rectangular.

9. The lens barrel according to claim 1, wherein the upper group monomer includes a first lens, a second lens, and a third lens, the first lens, the second lens, and the third lens constitute a first lens group, and the first lens group has positive power; the lower group monomer comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens form a second lens group, and the second lens group has negative focal power.

10. The lens according to claim 9, comprising, in order from an object side to an image side:

the first lens having a positive optical power;

the second lens having a negative optical power;

the third lens having a positive optical power;

the fourth lens;

the fifth lens having a negative optical power;

the sixth lens having positive optical power; and

the seventh lens having a negative optical power;

wherein the aperture of the lens is less than 1.65 and the optical length of the lens is less than 5 millimeters;

the first to seventh lenses satisfy the following conditional expression (5):

0.7<f/f123<1 (5)

where f is a whole group focal length value of the lens, and f123 is a combined focal length value of the first lens, the second lens, and the third lens.

11. A lens barrel as claimed in claim 10, wherein

The fourth lens has positive optical power; or

The fourth lens has a negative power.

12. The utility model provides a module of making a video recording which characterized in that includes:

a photosensitive chip; and

the lens barrel as claimed in any one of claims 1 to 11, wherein the lens barrel is located on a photosensitive path of the photosensitive chip.