WO2018224025A1 - Optical lens and lens module - Google Patents

Abstract

An optical lens and lens module. The optical lens comprises, in order from an object side to an image side: a first lens (L1) having a positive optical power; a second lens (L2) having a negative optical power; a third lens (L3) having a positive optical power; a fourth lens (L4); a fifth lens (L5) having a negative optical power; a sixth lens (L6) having a positive optical power; and a seventh lens (L7) having a negative optical power; wherein the F-number Fno of the optical lens is less than 1.65, and the optical length TTL of the optical lens is less than 5 millimeter. With the optimized configuration of optical powers of lenses, the optical lens and lens module can maintain miniaturization of a lens while realizing a large F-number thereof.

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 achieving a large aperture while keeping the lens downsized.

Background technique

Imaging devices such as a camera-mounted mobile device and a digital still camera using, for example, a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS) as solid-state imaging elements are well known.

With the development of science and technology, the resolution requirements of optical lenses are getting higher and higher, from the original megapixels to the direction of tens of millions of pixels, and high-pixel lenses are becoming more and more popular.

In general, the resolution can be increased by increasing the number of lenses in the optical lens. Therefore, as the requirements for optical lenses continue to increase, the number of lenses in optical lenses is increasing, for example, 5 to 6 pieces. The volume and weight of the optical lens will increase.

On the other hand, with the popularization of mobile devices, more and more small-sized imaging devices, such as imaging devices applied to mobile phones, are required, and the requirements for small size are also very high.

In addition, with the large aperture, high-pixel, high-quality optical lens becoming mainstream, the aperture of the existing optical lens is too small.

Therefore, there is a need for an improved optical lens and lens module.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel and improved optical lens and lens module capable of achieving a large aperture while keeping the lens miniaturized in view of the above-mentioned drawbacks and deficiencies in the prior art.

An object of the present invention is to provide an optical lens and a lens module through which the optical power of the first lens to the seventh lens in the optical lens is set such that the optical lens has an aperture of less than 1.65 and the optical lens has an optical length of less than 5 mm. A large aperture optical lens that meets the thin design can be obtained.

In the optical lens according to the embodiment of the invention, the power setting of the first lens to the seventh lens in the optical lens is set such that the ratio of the optical length of the optical lens to the maximum image height of the optical lens is less than 1.6, which can be maintained The miniaturization of the optical system meets the needs of thin design of optical lenses.

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

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

In the optical lens according to the embodiment of the invention, the power of the first lens to the seventh lens in the optical lens is set such that the distance from the first lens side to the side of the seventh lens image on the optical axis is optical The ratio between the apertures of the system is less than 2, which can increase the amount of light entering the optical lens and maintain its miniaturization.

In the optical lens according to the embodiment of the invention, the power setting of the first lens to the seventh lens in the optical lens is set such that the entire set of focal length values of the optical lens and the combined focal length value of the first lens to the third lens The ratio of more than 0.7 and less than 1, can properly equalize the refractive power of the first group composed of the first lens to the third lens, further correct the aberration of the optical system, and help to shorten the back focus of the system, and maintain the system small Chemical.

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

In the above optical lens, the first lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface; and the second lens is a meniscus lens on the convex object side, The object side is a convex surface, and the image side surface is a concave surface; the third lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens is a convex image side a meniscus lens having a concave side and a convex side as the side surface; the fifth lens is a meniscus lens on the convex object side, a convex surface on the object side, and the image side is a concave surface; The lens is a lenticular lens whose convex side is convex and the image side is convex; and the seventh lens is a biconcave lens whose concave side is concave and the image side is concave.

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

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

TTL/Imgh<1.6 (1)

Where TTL is the optical length of the optical lens, and Imgh is the 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 entire set of focal length values of the optical lens and D34 is the distance of the third lens from 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 the distance from the object side of the first lens of the optical lens to the image side of the seventh lens on the optical axis, and the EPD is the entrance 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 the entire set of focal length values of the optical lens, and f123 is the 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 a positive power; the fourth lens, the fifth lens, and the sixth lens The seventh lens constitutes a second lens group, and the second lens group has a negative 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 the object side to the image side, in order: a first lens having a positive power; a second lens having a negative power; a third lens having a positive power; a fourth lens having a negative power; a fifth lens having a negative power; having a positive light a sixth lens having a power; and a seventh lens having a negative power; wherein the optical lens has an aperture of less than 1.65 and the optical lens has an optical length of less than 5 mm.

In the above lens module, the first lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface; and the second lens is a convex object side convex moon lens The side surface of the object is a convex surface, and the image side is a concave surface; the third lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens is a convex image a side meniscus lens having a concave side and a convex side as the side surface; the fifth lens is a meniscus lens on the convex object side, a convex surface on the object side, and the image side is a concave surface; The six lens is a lenticular lens whose object side is convex and the image side is convex; and, the seventh lens is a biconcave lens whose object side is concave and the image side is concave.

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

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

TTL/Imgh<1.6 (1)

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

0.08<D34/f<0.15 (3)

Where f is the entire set of focal length values of the optical lens and D34 is the distance of the third lens from 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)

Wherein, Td is the distance from the object side of the first lens of the optical lens to the image side of the seventh lens on the optical axis, and the EPD is the entrance aperture of the optical lens.

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

0.7<f/f123<1 (5)

Where f is the entire set of focal length values of the optical lens, and f123 is the combined focal length value of the first lens, the second lens, and the third lens.

In the above lens module, the first lens, the second lens, and the third lens constitute a first lens group, and the first lens group has a positive power; the fourth lens, the fifth lens, and the sixth The lens, the seventh lens constitutes a second lens group, and the second lens group has a negative power.

In the above lens module, further comprising: a first group of cells including the first lens group; a second group of cells including the second lens group; and at least one assembly structure, preset in the Between the first group of monomers and the second group of monomers, the first group of cells and the second group of cells are assembled with each other by an assembly structure to constrain the relative assembly position.

In the above lens module, the first group of cells further includes a first carrier member, the first lens, the second lens and the third lens are mounted on the first carrier member; the second group The unit further includes a second carrier member, the fourth lens, the fifth lens, the sixth lens, and the seventh lens being mounted to the second carrier member; and, the first carrier member and the second carrier member They are assembled to each other by the assembly structure.

In the above lens module, the first group of cells 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 cells further includes at least one second spacer disposed in cooperation with the fourth lens, the fifth lens, the sixth lens, and the seventh lens to provide a predetermined light path.

In the above lens module, the first group of cells and the second group of cells are assembled by active calibration.

The optical lens and the lens module provided by the invention can realize the optical lens and the lens module of the large aperture while keeping the lens miniaturized by the optimal setting of the 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.

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

FIG. 5 is a cross-sectional view of a multi-group lens in accordance with an embodiment of the present invention.

FIG. 6 is a schematic diagram of a top group of a multi-group lens according to an embodiment of the invention.

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

Figure 8 is a partial enlarged view of the position A in Figure 5.

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

10 is a schematic diagram of a subgroup assembly process in accordance with an embodiment of the present invention.

11 is a schematic diagram of assembling an upper group unit and a lower group unit into a multi-group lens according to an embodiment of the present invention.

12A and 12B are diagrams showing the effect of multi-group setting of lenses according to an embodiment of the present invention.

detailed description

The following description is provided to disclose the invention to enable those skilled in the art to practice the invention. The preferred embodiments in the following description are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention as defined in the following description may be applied to other embodiments, modifications, improvements, equivalents, and other embodiments without departing from the spirit and scope of the invention.

The use of the terms and words in the following description and claims is not to be construed as limited. Accordingly, the following description of various embodiments of the invention may be

The terminology used herein is for the purpose of the description and description As used herein, the singular and " In addition, it is to be understood that the terms "include" and/or "having", when used in the specification, are intended to mean the presence of the described features, number, steps, operations, components, elements, or combinations thereof, without excluding one or more other features. The existence or addition of numbers, steps, operations, components, components or groups thereof.

The terms used herein, including technical and scientific terms, have the same meaning as the terms commonly understood by those skilled in the art, as long as the term is not defined differently. It should be understood that the terms defined in the commonly used dictionary have meanings consistent with the meanings of the terms in the prior art.

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[Optical lens configuration]

An optical lens according to an embodiment of the present invention includes, in order from the object side to the image side, a first lens having a positive power; a second lens having a negative power; a third lens having a positive power; and a fourth lens; a fifth lens having a negative power; a sixth lens having a positive power; and a seventh lens having a negative power; wherein the optical lens has an aperture Fno of less than 1.65 and the optical lens has an optical length TTL of less than 5 Millimeter.

Thus, the aperture Fno of the optical lens according to the embodiment of the present invention is less than 1.65, so that the background of the imaged object is easily blurred, and the image quality in a low light environment is improved. Moreover, since the optical length TTL of the optical lens is less than 5 mm, it is possible to maintain the miniaturization of the optical lens while satisfying high pixels.

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

Preferably, in the optical lens according to the embodiment of the invention, the first lens is a meniscus lens on the convex object side, the object side is convex, and the image side is concave; the second lens is convex on the convex side The lunar lens has a convex side and a side surface which is a concave surface; the third lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens is a convex image side The meniscus lens has a concave side and a convex side as the side surface; the fifth lens is a meniscus lens on the convex object side, a convex surface of the object side, and the image side is a concave surface; the sixth lens is a lenticular lens The object side is a convex surface, and the image side is a convex surface; the seventh lens is a biconcave lens, the object side surface is a concave surface, and the image side surface is a concave surface.

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

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

Here, it will be understood by those skilled in the art that while adjusting the power, the shape of the lens and the pitch of the lens are correspondingly changed. Therefore, the lens overall parameter of the optical lens according to the embodiment of the present invention may also be realized by the setting of the power setting in cooperation with the lens shape and the lens pitch, but the lens shape is not limited to the above shape, but may be certain (preferably Smaller) changes. Thus, by adjusting the shape of the lens and adjusting the lens pitch, it is possible to achieve miniaturization of the optical lens and large aperture. However, the 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)

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

Thus, by satisfying the above conditional expression (1), it is possible to maintain the miniaturization of the optical system and to meet the demand for thin design of the optical lens.

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

-2<(R3+R4)/(R3-R4)<-1 (2)

Wherein R3 is the object side radius of curvature of the second lens, and R4 is the image side curvature radius of the second lens.

Thus, 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)

Where f is the entire set of focal length values of the optical lens and D34 is the distance of the third lens from the fourth lens on the optical axis.

Thus, by satisfying the above conditional expression (3), it is possible to correct astigmatism and field curvature while controlling the CRA range, and to promote the optical system to have good imaging performance.

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

Td/EPD<2 (4)

Wherein, Td is the distance from the object side of the first lens to the image side of the seventh lens on the optical axis, and the EPD is the entrance pupil of the optical lens.

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

Preferably, 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 the entire set of focal length values of the optical lens and f123 is the combined focal length value of the first lens, the second lens, and the third lens.

Thus, by satisfying the above conditional expression (5), it is possible to appropriately equalize the refractive power of the first group composed of the first lens to the third lens, further correct the aberration of the optical system, and contribute to shortening the back focus of the system. To maintain system miniaturization.

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 a positive power; the fourth lens, the fifth lens, the sixth lens, and the seventh lens constitute a first lens group The two lens groups, and the second lens group has a negative power.

That is, in the optical lens according to the embodiment of the present invention, the first lens to the seventh lens are set as two lens groups, which will be further described below in relation to the lens module.

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

[A numerical example of an optical lens]

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

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

Where Z(h) is the position of the aspherical surface at the height h along the optical axis direction, and the distance vector from the aspherical vertex is high.

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

In addition, Nd represents a refractive index, and Vd represents an Abbe's 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, from the object side to the image side, an aperture stop STO; a meniscus shaped first lens L1 having positive refractive power, having a convex object side a first surface S2 and a second surface S3 on the concave image side; a second lens L2 having a meniscus having a negative refractive power, having a first surface S4 on the convex object side and a second surface S5 on the concave image side a meniscus shaped third lens L3 having a positive refractive power, having a first surface S6 on the convex object side and a second surface S7 on the concave image side; and a fourth lens L4 having a first surface on the concave object side S8 and a second surface S9 on the convex image side; a fifth lens L5 having a meniscus having a negative refractive power, having a first surface S10 on the convex object side and a second surface S11 on the concave image side; having a positive light a sixth convex lens L6 having a biconvex shape having a first surface S12 on the convex object side and a second surface S13 on the convex image side; a seventh lens L7 having a double concave shape having a negative refractive power, having a concave shape a first surface S14 on the object side and a second surface S15 on the concave image side; the plane lens L8 having the first surface S16 toward the object side and the image side The second surface S17, is typically a cover glass for protecting the imaging surface; L9 of an imaging plane IMA.

The lens data of the above lens is shown in Table 1 below:

【Table 1】

surface	radius	thickness	Nd	Vd
STO	unlimited	-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	unlimited	0.300	1.517	64.167
17	unlimited	0.506
IMA	unlimited

First surface S2 and second surface S3 of the first lens, first surface S4 and second surface S5 of the second lens, first surface S6 and second surface S7 of the third lens, first surface S8 of the fourth lens And the second surface S9, 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 conical coefficients of the first surface S14 and the second surface S15 of the seventh lens k and the high-order aspherical coefficients A, B, C, D, E, F, and G are as shown in Table 2 below.

【Table 2】

In the optical lens according to the first embodiment of the present invention, 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 relationship therebetween, the radius of curvature R3 of the object side of the second lens and Like the side curvature radius R4 and the relationship between it, D34 and the entire set of focal length value f of the optical lens and the relationship between them, the distance Td of the first lens object side to the seventh lens image side on the optical axis and the optical system The relationship between the entrance pupil aperture EPD and the relationship between the entire set 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 as 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 the above Table 3, the optical lens according to the first embodiment of the present invention satisfies the aforementioned conditional expressions (1) to (5), thereby realizing a large aperture while shortening the TTL, and obtaining a high-capacity high-pixel optical lens. .

Second embodiment

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, from the object side to the image side, an aperture stop STO; a meniscus shaped first lens L1 having positive refractive power, having a convex object side a first surface S2 and a second surface S3 on the concave image side; a second lens L2 having a meniscus having a negative refractive power, having a first surface S4 on the convex object side and a second surface S5 on the concave image side a meniscus shaped third lens L3 having a positive refractive power, having a first surface S6 on the convex object side and a second surface S7 on the concave image side; and a fourth lens L4 having a first surface on the concave object side S8 and a second surface S9 on the convex image side; a fifth lens L5 having a meniscus having a negative refractive power, having a first surface S10 on the convex object side and a second surface S11 on the concave image side; having a positive light a sixth convex lens L6 having a biconvex shape having a first surface S12 on the convex object side and a second surface S13 on the convex image side; a seventh lens L7 having a double concave shape having a negative refractive power, having a concave shape a first surface S14 on the object side and a second surface S15 on the concave image side; the plane lens L8 having the first surface S16 toward the object side and the image side The second surface S17, is typically a cover glass for protecting the imaging surface; L9 of an imaging plane IMA.

The lens data of the above lens is shown in Table 4 below:

【Table 4】

surface	radius	thickness	Nd	Vd
STO	unlimited	-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	unlimited	0.300	1.517	64.167
17	unlimited	0.522
IMA	unlimited

First surface S2 and second surface S3 of the first lens, first surface S4 and second surface S5 of the second lens, first surface S6 and second surface S7 of the third lens, first surface S8 of the fourth lens And the second surface S9, 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 conical coefficients of the first surface S14 and the second surface S15 of the seventh lens k and high-order aspherical coefficients A, B, C, D, E, F, and G are as shown in Table 5 below.

【table 5】

In the optical lens according to the second embodiment of the present invention, 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 relationship therebetween, the radius of curvature R3 of the object side of the second lens and Image side radius of curvature R4 and its relationship, D34 and the entire set of focal length values F of the optical lens and their relationship, the distance Td from the side of the first lens to the side of the seventh lens image on the optical axis and the optical system The relationship between the entrance pupil aperture EPD and the relationship between the entire set 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 as 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 the above Table 6, the optical lens according to the second embodiment of the present invention satisfies the aforementioned conditional expressions (1) to (5), thereby realizing a large aperture while shortening the TTL, and obtaining a high-capacity high-pixel optical lens. .

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 includes, from the object side to the image side, an aperture stop STO; a meniscus shaped first lens L1 having positive refractive power, having a convex object side a first surface S2 and a second surface S3 on the concave image side; a second lens L2 having a meniscus having a negative refractive power, having a first surface S4 on the convex object side and a second surface S5 on the concave image side a meniscus shaped third lens L3 having a positive refractive power, having a first surface S6 on the convex object side and a second surface S7 on the concave image side; and a fourth lens L4 having a first surface on the concave object side S8 and a second surface S9 on the convex image side; a fifth lens L5 having a meniscus having a negative refractive power, having a first surface S10 on the convex object side and a second surface S11 on the concave image side; having a positive light a sixth convex lens L6 having a biconvex shape having a first surface S12 on the convex object side and a second surface S13 on the convex image side; a seventh lens L7 having a double concave shape having a negative refractive power, having a concave shape a first surface S14 on the object side and a second surface S15 on the concave image side; the plane lens L8 having the first surface S16 toward the object side and the image side The second surface S17, is typically a cover glass for protecting the imaging surface; L9 of an imaging plane IMA.

The lens data of the above lens is shown in Table 7 below:

[Table 7]

First surface S2 and second surface S3 of the first lens, first surface S4 and second surface S5 of the second lens, first surface S6 and second surface S7 of the third lens, first surface S8 of the fourth lens And the second surface S9, 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 conical coefficients of the first surface S14 and the second surface S15 of the seventh lens k and high-order aspherical coefficients A, B, C, D, E, F, and G are as shown in Table 8 below.

[Table 8]

In the optical lens according to the second embodiment of the present invention, 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 relationship therebetween, the radius of curvature R3 of the object side of the second lens and Image side radius of curvature R4 and its relationship, D34 and the entire set of focal length values F of the optical lens and their relationship, the distance Td from the side of the first lens to the side of the seventh lens image on the optical axis and the optical system The relationship between the entrance pupil aperture EPD and the relationship between the entire set 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 as 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 the above Table 9, the optical lens according to the third embodiment of the present invention satisfies the aforementioned conditional expressions (1) to (5), thereby realizing a large aperture while shortening the TTL, and obtaining a high-capacity high-pixel optical lens. .

In the optical lens according to the embodiment of the invention, the optical power of the first lens to the seventh lens in the optical lens is set such 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 that meets the thin design.

In the optical lens according to the embodiment of the present invention, the power setting of the first lens to the seventh lens in the optical lens is set such that 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, Maintaining the miniaturization of the optical system to meet the thin design requirements of optical lenses.

In the optical lens according to the embodiment of the present invention, the curvature of the object side curvature radius R3 and the image side curvature radius R4 of the second lens is set such that 2<(R3+R4)/(R3-R4)<4 is satisfied. Effectively reduce the aberration of the optical system.

In the optical lens according to the embodiment of the invention, the power of the first lens to the seventh lens in the optical lens is set such that the ratio between the D34 and the entire set of focal length values F of the optical lens is greater than 0.08 and less than 0.15. The astigmatism and field curvature can be corrected while controlling the CRA range to obtain good imaging performance of the optical lens.

In the optical lens according to the embodiment of the present invention, the power of the first lens to the seventh lens in the optical lens is set such that the distance Td of the first lens object side to the seventh lens image side on the optical axis is The ratio between the entrance pupil aperture EPD of the optical system is less than 2, which can increase the amount of light entering the optical lens and maintain its miniaturization.

In the optical lens according to the embodiment of the invention, the power setting of the first lens to the seventh lens in the optical lens is set such that the entire set of focal length values of the optical lens and the combined focal length value of the first lens to the third lens The ratio of more than 0.7 and less than 1, can properly equalize the refractive power of the first group composed of the first lens to the third lens, further correct the aberration of the optical system, and help to shorten the back focus of the system, and maintain the system small Chemical.

[Configuration of lens module]

According to another aspect of an embodiment 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 being sequentially included from the object side to the image side a first lens having positive power; a second lens having negative power; a third lens having positive power; a fourth lens; a fifth lens having negative power; and a sixth having positive power a lens; and a seventh lens having a negative power; wherein the optical lens has an aperture of less than 1.65 and the optical lens has an optical length of less than 5 mm.

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 to acquire an optical image of a subject, and the imaging element 102 is used to convert an optical image picked up by the optical lens 101 into an electrical signal.

In the above lens module, the first lens is a meniscus lens on the convex 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 on the convex object side, The side surface of the object is a convex surface, and the image side surface is a concave surface; the third lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens is a convex moon facing the image side a lens having a concave side and a convex side as the side surface; the fifth lens is a meniscus lens on the convex object side, a convex surface of the object side, and the image side is a concave surface; the sixth lens is a lenticular lens, The side of the object is a convex surface, and the image side is a convex surface; and, the seventh lens is a biconcave lens, the object side surface is a concave surface, and the image side surface is a concave surface.

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

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

TTL/Imgh<1.6 (1)

Where 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)

Where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

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 entire set of focal length values of the optical lens and D34 is the distance of the third lens from 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)

Wherein, Td is the distance from the object side of the first lens of the optical lens to the image side of the seventh lens on the optical axis, and the EPD is the entrance aperture of the optical lens.

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

0.7<f/f123<1 (5)

Where f is the entire set of focal length values of the optical lens and f123 is the combined focal length value of the first lens, the second lens, and the third lens.

In the above lens module, the first lens, the second lens, and the third lens constitute a first lens group, and the first lens group has a positive power; the fourth lens, the fifth lens, the sixth lens, and the The seven lenses constitute a second lens group, and the second lens group has a negative power.

Here, those skilled in the art can understand that other details of the optical lens in the imaging device according to the embodiment of the present invention are the same as those described with respect to the optical lens according to the embodiment of the present invention, and the first invention of the present invention can be employed. Numerical examples of the optical lens of the embodiment to the second embodiment are therefore omitted in order to avoid redundancy.

The optical lens and the lens module according to the embodiment of the present invention are set by the power of the first lens to the seventh lens in the optical lens such 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 that meets the thin design is obtained.

The optical lens and the lens module according to the embodiment of the present invention are set by the power of the first lens to the seventh lens in the optical lens such that 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. The optical system can be miniaturized to meet the thin design requirements of optical lenses.

The optical lens and the lens module according to the embodiment of the present invention pass through the setting of the object side curvature radius R3 and the image side curvature radius R4 of the second lens such that -2<(R3+R4)/(R3-R4)<- is satisfied. 1, can effectively reduce the aberration of the optical system.

The optical lens and the lens module according to the embodiment of the present invention are set by the power of the first lens to the seventh lens in the optical lens such that the ratio between the D34 and the entire set of focal length values F of the optical lens is greater than 0.08 and less than 0.15, which can correct astigmatism and field curvature while controlling the CRA range, and obtain good imaging performance of the optical lens.

The optical lens and the lens module according to the embodiment of the present invention are disposed by the power of the first lens to the seventh lens in the optical lens such that the distance from the first lens object side to the seventh lens image side on the optical axis is Td The ratio between the entrance aperture and the EPD of the optical system is less than 2, which can increase the amount of light entering the optical lens and maintain its miniaturization.

The optical lens and the lens module according to the embodiment of the present invention are set by the power of the first lens to the seventh lens in the optical lens such that the entire focal length value of the optical lens and the combined focal length of the first lens to the third lens The ratio of the values is greater than 0.7 and less than 1, and the refractive power of the first group composed of the first lens to the third lens can be appropriately equalized, the aberration of the optical system is further corrected, and the back focus of the system is shortened, and the system is maintained. miniaturization.

In the optical lens and lens module according to an embodiment of the present invention, a lens having substantially no lens power can also be disposed. Therefore, in addition to the first to seventh lenses described above, an additional lens can be disposed. 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 of the arrangement other than the above-described first to seventh lenses.

[Multiple group settings for lenses]

As described above, in the optical lens and the lens module according to the embodiment of the present invention, seven or more lenses may be disposed. For these lenses, ensuring the uniformity of the optical axes, that is, ensuring the uniformity of the central axes of the lenses, and conforming to the central axis of the photosensitive chip, is the basis for ensuring good image quality. For a conventional optical lens, a plurality of lenses are usually assembled one by one in a lens barrel, and inevitably, each lens and the lens barrel are assembled with a certain error during assembly. Finally, the assembly of the entire lens and the barrel creates a cumulative error, which is the assembly error of a single optical lens. It can be easily seen that the larger the number of lenses, the larger the cumulative error, the lower the overall quality of the lens, and the lower the yield during lens production.

On the other hand, for a conventional lens, a plurality of lenses are assembled in the same lens barrel, and the relative positions between the lenses are substantially determined and cannot be adjusted. Once the lens is assembled in the lens barrel, the lens quality is determined, which also makes the mirror The processing accuracy of the barrel and lens is high.

It is worth mentioning that as the number of lenses increases, the number of lenses increases, and the problems caused by the lens become more serious.

It is also worth mentioning that the lens of the optical lens and the assembly relationship between the lens and the lens tube directly affect the quality of the optical lens, and the lens module, especially the lens module used in some smart devices, such as a smart phone, its size It is relatively small, so how to combine the existing equipment requirements, make full use of the structure of the optical lens, and study the optical lens suitable for practical production applications is also an aspect to be considered.

In response to the above problems, embodiments of the present invention provide a multi-group design of lenses, that is, providing a multi-group lens, which is assembled by a plurality of group monomers to form a unitary lens, so that each group is in a single unit. The number of lenses is small, and the assembly error of each cell is small, but the total number of lenses of the multi-group lens composed of each group of cells is large, so that higher pixels can be provided and the cumulative error is small. In the process of assembling the multi-group lens, each group of cells can be assembled by using an Active Alignment (AA) method, so that the relative error between the groups of the groups is reduced, thereby making the group more Group lenses have better optical consistency.

Further, each group of cells is assembled by an assembly structure, for example, fitting with each other, so that each group of cells is stably assembled to form a multi-group lens. Specifically, the fitting manner can block external stray light from entering the inside of the multi-group lens 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 forming bonding medium, such as a UV thermosetting glue, and the assembly structure can provide a sufficient ultraviolet light irradiation area for the bonding medium, so that each group The group of monomers is assembled and fixed quickly and stably, thereby improving production efficiency.

5 through 11 are multi-group lenses 100 in accordance with a preferred embodiment of the present invention. The multi-group lens 100 includes a plurality of group cells 10 and at least one assembly structure 20, and the assembly structure 20 is preset to each group of cells 10, and the adjacent two groups of cells 10 are mutually coupled by the assembly structure 20 and Assembly.

For convenience of description, in this embodiment of the present invention, the multi-group lens 100 is configured by taking two groups of cells 10 as an example. Of course, in other embodiments of the present invention, the multi-group lens 100 may include more The plurality of group monomers 10, such as three or more, are not limited in this respect.

Moreover, although in this embodiment it is shown that the two group cells 10 are mated and assembled by the assembly structure 20, the two group cells 10 can also be mounted together by other forms of the assembly structure 20, or by, for example, glue The bodies are bonded to each other, and therefore, the present invention is not intended to limit the specific assembly structure between the two group monomers 10.

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

The upper group unit 11 includes a plurality of upper lenses 111 and an upper carrier member 112, and each upper lens 111 is sequentially disposed in the upper carrier member 112 in a light path.

The lower group unit 12 includes a plurality of lower lenses 121 and a lower carrier member 122, and each of the lower lenses 121 is sequentially disposed in the lower carrier member 122 in a light path.

Further, in this embodiment of the invention, the upper carrier member 112 of the upper group of cells 11 includes an upper carrier body 1121 and an extension wall 1122. The upper carrier body 1121 is a hollow structure to accommodate and mount the lenses and to arrange them along the ray path. In other words, the upper lenses 111 of the upper group unit 11 are mounted inside the upper carrier body 1121 to facilitate providing a light path. The extension wall 1122 extends outwardly from the exterior of the upper carrier body 1121 to facilitate overlapping the upper carrier member 112 of the lower group of cells 12.

More specifically, the extension wall 1122 extends integrally outward from the exterior of the upper carrier body 1121. In some embodiments, the extension wall 1122 can be an annular extension wall that extends outwardly from the upper carrier body 1121 to form an annular brim structure to facilitate abutment of the lower carrier member of the lower group unit 12 by the brim structure. 122, providing stable support for the upper group of cells 11.

The upper carrier body 1121 of the upper carrier member 112 of the upper group unit 11 has a lower sleeve end portion 11211 located below the extension wall 1122, and the lower sleeve end portion 11211 is sleeved to the lower carrier member 122 of the lower group unit 12. . In other words, the extension wall 1122 of the upper carrier member 112 of the upper group unit 11 divides the upper carrier body 1121 into two portions, the upper portion and the lower portion, and the lower portion, the lower sleeve end portion 11211. . When the extension wall 1122 of the upper carrier member 112 of the upper group unit 11 overlaps the lower carrier member 122 of the lower group unit 12, the lower sleeve end portion 11211 is sleeved under the lower group unit 12 Component 122.

The lower carrier member 122 of the lower group unit 12 includes a lower carrier body 1221 and an upper overlapping end portion 1222. The lower carrier body 1221 is a hollow structure for accommodating and mounting the respective lower lenses 121 and arranging them along the light path. In other words, each of the lower lenses 121 of the lower group of cells 12 is mounted inside the lower carrier body 1221 to facilitate providing a light path. The upper overlapping end portion 1222 is integrally connected to the lower carrying body 1221 so as to fit the upper carrying member 112 of the upper group unit 11 such that when the extending wall 1122 of the upper receiving member overlaps the upper overlapping member 122 At the end 1222, the lower sleeve end 11211 of the upper carrier member 112 of the upper group unit 11 extends into the upper overlapping end portion 1222 of the lower carrier member 122 such that the lower carrier member 122 of the lower group unit 12 The installation position of the group unit 11 is constrained.

In other words, in this embodiment of the invention, the extension wall 1122 and the upper overlapping end portion 1222 form an assembled structure 20 to facilitate assembly of the upper group 11 and the lower group of cells 12 in a nested manner.

The upper overlapping end portion 1222 is an inwardly extending hollow structure to provide an overlapping support position for the upper group of cells 11 and a light path for each of the lower lenses 121 located within the lower carrier body 1221.

Further, in this embodiment of the invention, the extension wall 1122 of the upper carrier member 112 of the upper group unit 11 has a lower fitting groove 11221 forming a downwardly extending lower fitting leg 11222; the lower group unit 12 The upper overlapping end portion 1222 of the lower carrying member 122 has an upper fitting groove 12221, and at least one upper fitting leg 11222 is formed to facilitate the fitting of the extending wall 1122 of the upper carrying member 112 of the upper group unit 11. The groove 11221 and the lower fitting leg 11222.

Specifically, when the upper group unit 11 is overlapped with the lower group unit 12, the extension wall 1122 of the upper carrier unit 112 of the upper group unit 11 overlaps the lower carrier of the lower group unit 12. The upper overlapping end portion 1222 of the member 122, the lower fitting leg 11222 of the extension wall 1122 extends from the upper fitting groove 12221 of the upper overlapping end portion 1222, and the fitting leg of the upper overlapping end portion 1222 extends to the extending wall 1122 The lower fitting groove 11221 is such that the extension wall 1122 and the upper overlapping end portion 1222 are fittingly overlapped.

In accordance with this embodiment of the invention, the upper overlapping end portion 1222 includes two upper fitting legs 12222, 12223, one of which is located on the inside and the other on the outside, which are spaced apart to form the upper engagement groove 1221.

In other words, the upper upper fitting legs 12222, 12223 of the upper overlapping end portion 1222 of the lower carrying member 122 of the lower group unit 12 are respectively extended upward, thereby forming the upper fitting groove 1221. One of the two fitting legs 12222, 12223 is located on the inner side, and the other is located on the outer side, so that the fitting leg 1222 is respectively restrained in two directions, and the inner fitting leg 12222 is located in the lower fitting groove 11221 of the extending wall 1122. Extending so that external light can be blocked from entering the interior of the multi-group lens 100. The inner extending leg 1222 is located outside the lower sleeve end 11211 of the upper carrier body 1121 of the upper carrier member 112 of the upper group unit 11, constrains the lower sleeve end portion 11211, and cooperates with the lower sleeve end portion 11211. Block external light from entering the interior. In this embodiment of the 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 portion 1222 constitute an assembly structure 20, assembled The structures 20 are respectively disposed on the upper carrier member 112 and the lower carrier member 122, so that the upper group unit 11 and the lower group unit 12 are mated and sleeved stably assembled. In this embodiment of the invention, the lower fitting groove 11221 of the extension wall 1122 forms an annular structure, the lower fitting leg 11222 forms an annular structure, and the upper fitting legs 12222, 12223 form an annular structure, and the upper fitting groove 12221 is formed. The annular structure is assembled to cooperate with each other.

When the upper group unit 11 and the lower group unit 12 are fixed, the upper fitting groove 12221 accommodates the bonding medium 13, such as UV glue, thermosetting glue, UV thermosetting glue, etc., so as to facilitate the upper group single The body 11 and the lower group of monomers 12 are stably fixed. The upper upper fitting legs 12222, 12223 of the upper overlapping end portion 1222 are upwardly raised to block the adhesive medium 13 from flowing inward or outward, thereby preventing the bonding medium 13 from contaminating the inner lens or affecting the overall appearance. Of course, in other embodiments of the present invention, the upper group unit 11 and the lower group unit 12 may be fixed by other means, such as heat welding, ultrasonic welding, laser welding, etc., and the present invention is not limit.

Further, preferably, the top end of the fitting leg 12223 located on the outer side is higher than the fitting leg 12222 located on the inner side, thereby preventing the bonding medium 13 accommodated in the upper fitting groove 12221 from overflowing to the outside to ensure a neat appearance. Of course, in other embodiments of the present invention, the height of the fitting leg 12222 located on the inner side and the height of the fitting leg 12223 located on the outer side may be identical or other ratios, and the present invention is not limited in this respect.

It is worth mentioning that, in actual production, the portion of the bonding medium 13 in the upper fitting groove 12221 overflows to the surface of the fitting leg 12222 on the inner side, and when the extending wall 1122 and the fitting leg 12222 on the inner side When the gap is small, the gap of the overflow is provided, so that the bonding medium 13 overflowing the surface of the upper fitting leg 12222 easily contacts the extension arm 1122 of the upper group unit 11, thereby hindering the upper group of monomers. 11 and the relative movement of the lower group of cells 12, such as when the upper group of cells 11 is actively calibrated, the upper group of cells 11 may drive the movement of the lower group of cells 12, thereby affecting the effect of active calibration, The arrangement of the lower fitting groove 11221 of the extension wall 1122 in the present embodiment increases the gap between the upper fitting leg 12222 and the extension arm 1122, thereby making it possible to accurately perform active calibration.

Of course, in addition to the assembly structure 20 described above, the two group monomers 10 may be fixed by, for example, simply superimposing. Alternatively, the superposition type bonding medium may be used to bond the two group monomers 10.

Further, referring to FIG. 5, FIG. 6, and FIG. 9, the upper group unit 11 includes at least one spacer 113 disposed with the upper lenses 111 to constrain the light passing through the lens 111 to facilitate providing a predetermined light path.

In this embodiment of the invention, the upper group unit 11 includes three upper lenses 111, which are a first upper lens 1111, a second upper lens 1112 and a third upper lens 1113, respectively. The first upper lens 1111, the second upper lens 1112, and the third upper lens 1113 are sequentially disposed in the upper carrier body 1121 of the upper carrier member 112 of the upper group unit 11 from the top to bottom ray paths. In this embodiment, the upper group unit 11 includes two spacers 113 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, respectively. .

It is worth mentioning that the spacer 113 can also be in other forms, such as a coating on the upper lens 111.

Referring to FIG. 6, the lower sleeve end portion 11211 of the upper carrier body 1121 has at least one reinforcing fixing groove 112112 for receiving the bonding medium 13, and reinforcing and fixing the upper lens 111 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 can be understood that the reinforcing fixing groove 112112 corresponds to the outermost upper lens 111. For example, when the lens in the upper carrying body 1121 is two pieces, the second lens is fixed and fixed, and the lens inside the upper carrying body 1121 is When four pieces are used, the fourth upper lens 1114 is reinforced.

Preferably, in some embodiments, the reinforcing fixing grooves 112112 are symmetrically distributed on the lower sleeve end portion 11211 of the upper carrier body 1121 in order to provide a uniform force to the corresponding upper lens 111, preventing the bonding medium 13 from being subjected to When the environmental influence changes, the force acting on the upper lens 111 is not uniform, such as the uneven force applied when the adhesive medium 13 is thermally expanded.

The reinforcing fixing groove 112112 can be designed into different shapes according to requirements, such as a wedge shape, a triangle shape, a trapezoid shape, a rectangular shape, and the like. The reinforcing fixing grooves 112112 may be separately spaced apart or may be connecting grooves, that is, forming an integral annular groove, and the annular groove may have different shapes in cross section.

Preferably, when designing the shape and size of the reinforcing fixing groove 112112, the wall thickness of the lower sleeve end portion 11211 can be combined to enable it to bear sufficient structural strength without being too thin.

Preferably, the depth of the reinforcing fixing groove 112112 is smaller than the thickness of the edge of the corresponding lens, preventing a gap between the reinforcing fixing groove 112112 and the top edge of the lens, so that the glue penetrates the gap into the interior.

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

Referring to Figure 9, the assembly process of the upper group unit 11 in accordance with the first preferred embodiment of the present invention is illustrated. For example, the assembly process of the upper group unit 11 may be: firstly, the upper bearing unit 112 of the upper group unit 11 is placed on an assembly work surface, and then the first lens 1111 is assembled in the upper load bearing unit 112. Positioning, and then assembling the spacer 113 therein, and sequentially assembling the second upper lens 1112, the other spacer 113, and the third upper lens 1113. After assembling the third upper lens 1113, the reinforcing fixing groove 112112 is further required. The bonding medium 13 is internally applied to reinforce and fix the third upper lens 1113, whereby the assembly of the upper group unit 11 is completed.

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

It is worth mentioning that in the present invention, since the entire lens is composed of a plurality of group units 10, the number of lenses in each group unit 10 can be relatively small, such as one, two, three, four. And the entire lens, that is, the number of lenses of the multi-group lens 100 is obtained by adding the number of lenses of each group of cells 10, so that the number is large, for example, six, seven, eight, etc. can be provided, thereby providing The higher resolution lens is suitable for a high-pixel camera module, and during the assembly process, the optical axes of each group 10 can be aligned by the automatic calibration between the groups of cells 10, and the optical axis of each group 10 is uniform. The cumulative error of the multi-group lens 100 improves the image quality.

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

More preferably, in a four-lens embodiment, the upper group of monomers 11 includes four upper lenses 111, which are the first upper lens 1111, the second upper lens 1112, and the third upper surface, respectively. The lens 1113 and a fourth upper lens 1114, wherein the relationship between the upper lenses 111 is similar to the structure of the above three lenses, will not be described herein.

Further, referring to FIG. 5, FIG. 7, and FIG. 10, the lower group unit 12 includes at least one spacer 123 disposed in cooperation with the lower lens 121 to constrain the light passing through the lens to provide a predetermined light path. In this embodiment of the invention, the lower group of cells 12 includes three spacers 123 disposed between the upper portion of the lower lens 121, the first lower lens 1211 and the second lower lens 1212, and the second lower lens, respectively. Between 1212 and the third lower lens 1213.

Figure 10 is a schematic illustration of the assembly process of the lower group of cells 12 in accordance with a first preferred embodiment of the present invention. In order to facilitate the stable assembly of the lower group of cells 12, the present invention also provides an assembly jig 500 that cooperates with the structure of the upper overlapping end portion 1222 of the lower group of cells 12 such that the lower carrier member of the lower group of cells 12 122 is stably supported. Further, the assembly jig 500 has a bearing protrusion 501 adapted to the upper fitting groove 12221 of the upper overlapping end portion 1222 of the lower carrier member 122 of the lower group unit 12 so as to facilitate the lower carrying member 122 to be placed upside down. When the jig 500 is assembled, the bearing protrusion 501 is accommodated in the upper fitting groove 12221, thereby supporting the lower carrier member 122 upside down and stably.

The bearing protrusion 501 can be an annular structure that fits the annular upper fitting groove 1221. Of course, when the upper fitting groove 12221 has other structures, the bearing protrusions 501 can be correspondingly arranged to be matched structures.

For example, the assembly process of the lower group unit 12 may be: first, the lower carrier member 122 of the lower group unit 12 is placed on the assembly fixture 500, and then the spacer 113 is installed in the lower carrier member 122, and then The first lower lens 121 is mounted in the lower carrier member 122, and the spacer 113, the second lower lens 121, the spacer 113, and the third lower lens 121 are sequentially assembled.

In some embodiments of the present invention, the lower end of the lower carrier member 122 of the lower group unit 12 may be provided with a reinforcing fixing groove 112112 to reinforce and 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 pre-assembly of the third lower lens 121 is completed, the bonding medium 13 needs to be applied to the reinforcing fixing groove, thereby reinforcing and fixing the third lower lens 121.

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

In another embodiment of the present invention, the multi-group lens 100 can also be assembled by actively aligning the upper group unit 11 and the lower group unit 12 first, so that the upper group unit 11 and the lower group The relative position of the group unit 12 is determined, and the bonding medium 13 is applied to the upper fitting groove 12221 of the lower group unit 12, and the upper group unit 11 and the lower group unit 12 are further pre-fixed, for example. The ultraviolet light is irradiated, and finally the upper group 11 and the lower group 12 are fixed, and the upper group 11 and the lower group 12 are fixed, for example, by heat baking.

That is, in the lens module according to the embodiment of the present invention, the method further includes: a first group of cells including a first lens group; a second group of cells including a second lens group; and at least one assembly structure Presetting between the first group of cells and the second group of cells, the first group of cells and the second group of cells are assembled with each other by an assembly structure to constrain the relative assembly position.

In the above lens module, the first group of cells further includes a first carrier member, the first lens, the second lens and the third lens are mounted on the first carrier member; the second group of cells further includes a second carrier member The fourth lens, the fifth lens, the sixth lens, and the seventh lens are mounted to the second carrier member; and the first carrier member and the second carrier member are assembled to each other by the assembly structure.

In the above lens module, the first group of cells 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 cells Further comprising at least one second spacer disposed in cooperation with the fourth lens, the fifth lens, the sixth lens and the seventh lens to provide a predetermined light path.

In the above lens module, the first group of cells and the second group of cells are assembled by active calibration.

12A and 12B are diagrams showing the effect of multi-group setting of lenses according to an embodiment of the present invention. When the first lens, the second lens, and the third lens are combined into a first group of cells, and the fourth lens, the fifth lens, the sixth lens, and the seventh lens are combined into a second group of cells, actual production In the process, the first group of cells and the second group of cells are assembled separately and then combined and calibrated, and the real-time adjustment and calibration between the groups can be combined to significantly improve the product yield.

The optical lens and the lens module provided by the invention can realize the optical lens and the lens module of the large aperture while keeping the lens miniaturized by the optimal setting of the power of the lens.

Those skilled in the art should understand that the embodiments of the present invention described in the above description and the accompanying drawings are only by way of example and not limitation. The object of the invention has been achieved completely and efficiently. The function and structural principle of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may be modified or modified without departing from the principles.

Claims (22)

1. An optical lens, including from the object side to the image side, comprises:

   a first lens having positive power;

   a second lens having a negative power;

   a third lens having positive power;

   Fourth lens

   a fifth lens having a negative power;

   a sixth lens having positive power; and

   a seventh lens having a negative power;

   Wherein, the optical lens has an aperture of less than 1.65 and the optical lens has an optical length of less than 5 mm.
2. The optical lens according to claim 1, wherein

   The first lens is a meniscus lens on the convex 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 on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface;

   The third lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface;

   The fourth lens is a meniscus lens on the convex image side, the object side surface is a concave surface, and the image side surface is a convex surface;

   The fifth lens is a meniscus lens on the convex object side, a convex surface of the object side surface, and the image side surface is a concave surface;

   The sixth lens is a lenticular lens having a convex side and a side convex surface; and

   The seventh lens is a biconcave lens whose object side is a concave surface and the image side surface is a concave surface.
3. The optical lens according to claim 1, wherein

   The fourth lens has positive power; or

   The fourth lens has a negative power.
4. The optical lens according to any one of claims 1 to 3, wherein the first to seventh lenses satisfy the following conditional expression (1):

   TTL/Imgh<1.6 (1)

   Where TTL is the optical length of the optical lens, and Imgh is the maximum image height of the optical lens.
5. The optical lens according to any one of claims 1 to 3, wherein 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, and R4 is an image side radius of curvature of the second lens.
6. The optical lens according to any one of claims 1 to 3, wherein the first to seventh lenses satisfy the following conditional expression (3):

   0.08<D34/f<0.15 (3)

   Where f is the entire set of focal length values of the optical lens and D34 is the distance of the third lens from the fourth lens on the optical axis.
7. The optical lens according to any one of claims 1 to 3, wherein the first to seventh lenses satisfy the following conditional expression (4):

   Td/EPD<2 (4)

   Wherein, Td is the distance from the object side of the first lens of the optical lens to the image side of the seventh lens on the optical axis, and the EPD is the entrance aperture of the optical lens.
8. The optical lens according to any one of claims 1 to 3, wherein the first to seventh lenses satisfy the following conditional expression (5):

   0.7<f/f123<1 (5)

   Where f is the entire set of focal length values of the optical lens, and f123 is the combined focal length value of the first lens, the second lens, and the third lens.
9. The optical lens according to any one of claims 1 to 3, characterized in that

   The first lens, the second lens, and the third lens constitute a first lens group, and the first lens group has a positive power;

   The fourth lens, the fifth lens, the sixth lens, and the seventh lens constitute a second lens group, and the second lens group has a negative refractive power.
10. A lens module, comprising: an optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal, the optical lens comprising, in order from the object side to the image side, in order:

    a first lens having positive power;

    a second lens having a negative power;

    a third lens having positive power;

    Fourth lens

    a fifth lens having a negative power;

    a sixth lens having positive power; and

    a seventh lens having a negative power;

    Wherein, the optical lens has an aperture of less than 1.65 and the optical lens has an optical length of less than 5 mm.
11. The lens module according to claim 10, wherein

    The first lens is a meniscus lens on the convex 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 on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface;

    The third lens is a meniscus lens on the convex object side, the object side surface is a convex surface, and the image side surface is a concave surface;

    The fourth lens is a meniscus lens on the convex image side, the object side surface is a concave surface, and the image side surface is a convex surface;

    The fifth lens is a meniscus lens on the convex object side, a convex surface of the object side surface, and the image side surface is a concave surface;

    The sixth lens is a lenticular lens having a convex side and a side convex surface; and

    The seventh lens is a biconcave lens whose object side is a concave surface and the image side surface is a concave surface.
12. The lens module according to claim 10, wherein

    The fourth lens has positive power; or

    The fourth lens has a negative power.
13. The lens module according to any one of claims 10 to 12, wherein the first to seventh lenses satisfy the following conditional expression (1):

    TTL/Imgh<1.6 (1)

    Where TTL is the optical length of the optical lens, and Imgh is the maximum image height of the optical lens.
14. The lens module according to any one of claims 10 to 12, wherein 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, and R4 is an image side radius of curvature of the second lens.
15. The lens module according to any one of claims 10 to 12, wherein the first to seventh lenses satisfy the following conditional expression (3):

    0.08<D34/f<0.15 (3)

    Where f is the entire set of focal length values of the optical lens and D34 is the distance of the third lens from the fourth lens on the optical axis.
16. The lens module according to any one of claims 10 to 12, wherein the first to seventh lenses satisfy the following conditional expression (4):

    Td/EPD<2 (4)

    Wherein, Td is the distance from the object side of the first lens of the optical lens to the image side of the seventh lens on the optical axis, and the EPD is the entrance aperture of the optical lens.
17. The lens module according to any one of claims 10 to 12, wherein the first to seventh lenses satisfy the following conditional expression (5):

    0.7<f/f123<1 (5)

    Where f is the entire set of focal length values of the optical lens, and f123 is the combined focal length value of the first lens, the second lens, and the third lens.
18. A lens module according to any one of claims 10 to 12, wherein

    The first lens, the second lens, and the third lens constitute a first lens group, and the first lens group has a positive power;

    The fourth lens, the fifth lens, the sixth lens, and the seventh lens constitute a second lens group, and the second lens group has a negative power.
19. The lens module according to claim 18, further comprising:

    a first group of monomers including the first lens group;

    a second group of monomers including the second lens group; and

    At least one assembly structure is preset to each of the group of cells, and each of the group of cells is assembled with each other by the assembly structure to restrain the relative assembly position.
20. The lens module according to claim 19, wherein

    The first group of cells further includes a first carrier member, the first lens, the second lens and the third lens being mounted to the first carrier member;

    The second group of cells further includes a second carrier member, and the fourth lens, the fifth lens, the sixth lens, and the seventh lens are mounted to the second carrier member;

    The first carrier member and the second carrier member are assembled to each other by the assembly structure.
21. The lens module according to claim 20, wherein

    The first group of cells 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;

    The second group of cells further includes at least one second spacer disposed in cooperation with the fourth lens, the fifth lens, the sixth lens, and the seventh lens to provide a predetermined light path.
22. The lens module according to claim 21, wherein

    The first group of cells and the second group of cells are assembled by active calibration.

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