CN114114624B - Optical lens group - Google Patents

Abstract

The invention provides an optical lens group. The optical lens assembly sequentially comprises from an object side to an image side along an optical axis: the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, wherein the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the image side surface of the first lens, the second reflection surface is positioned in a paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in a paraxial region of the image side surface of the first lens; a second lens having negative optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; a sixth lens having negative optical power; the total system length TTL of the optical lens group and the effective focal length f of the optical lens group satisfy the following conditions: TTL/f <0.6. The invention solves the problem that the long focus and the ultra-thin optical lens group in the prior art are difficult to be compatible at the same time.

Description

Optical lens group

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an optical lens group.

Background

Along with the popularization of portable electronic products such as mobile phones and tablet personal computers and the rapid development of scientific technology, the optical lens group suitable for the portable electronic products is more and more different day by day, and the requirements of people on the imaging quality of the optical lens group are also higher and higher. Meanwhile, currently rising double-shot and triple-shot technologies generally require the use of a tele lens to obtain a higher spatial angular resolution. In order to meet the market development requirement, the optical lens group needs as many lenses as possible to increase the degree of freedom of design and improve the imaging quality, but the total length of the system of the long-focus lens is easy to be too long, which is not beneficial to the ultrathin of the mobile phone lens and easily affects the appearance of the mobile phone lens.

That is, the optical lens group in the prior art has the problem that both the long focus and the ultra-thin lens are difficult to be compatible.

Disclosure of Invention

The invention mainly aims to provide an optical lens group so as to solve the problem that the optical lens group in the prior art has long focus and ultra-thin performance and is difficult to be simultaneously compatible.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical lens assembly comprising, in order from an object side to an image side along an optical axis: the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, wherein the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the image side surface of the first lens, the second reflection surface is positioned in a paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in a paraxial region of the image side surface of the first lens; a second lens having negative optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; a sixth lens having negative optical power; the total system length TTL of the optical lens group and the effective focal length f of the optical lens group satisfy the following conditions: TTL/f <0.6.

Further, the effective focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group satisfy: f/EPD <2.65.

Further, the total system length TTL of the optical lens assembly and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens element satisfy: 6.8< TTL/BFL <7.6.

Further, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2<1.6.

Further, the curvature radius R4 of the image side surface of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.0< (R4+R3)/(R4-R3) <2.1.

Further, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.2< R6/R5<1.2.

Further, the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -3.3< f4/R8< -1.6.

Further, the curvature radius R10 of the image side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.8< (R10+R11)/R9 <1.6.

Further, the combined focal length f23 of the second lens and the third lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: -10.3< f 23/(CT 2+ CT 3) < -4.3.

Further, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+CT5)/(ET 4+ET 5) <1.7.

Further, the first reflecting surface and the second reflecting surface are total reflecting surfaces.

Further, the first reflecting surface and the second reflecting surface are both provided with a total reflection film layer.

According to another aspect of the present invention, there is provided an optical lens assembly comprising, in order from an object side to an image side along an optical axis: the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, wherein the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the image side surface of the first lens, the second reflection surface is positioned in a paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in a paraxial region of the image side surface of the first lens; a second lens having negative optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; a sixth lens having negative optical power; the effective focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group satisfy: f/EPD <2.65.

Further, the total system length TTL of the optical lens assembly and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens element satisfy: 6.8< TTL/BFL <7.6.

Further, the total system length TTL of the optical lens group and the effective focal length f of the optical lens group satisfy: TTL/f <0.6; the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2<1.6.

Further, the curvature radius R4 of the image side surface of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.0< (R4+R3)/(R4-R3) <2.1.

Further, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.2< R6/R5<1.2.

Further, the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -3.3< f4/R8< -1.6.

Further, the curvature radius R10 of the image side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.8< (R10+R11)/R9 <1.6.

Further, the combined focal length f23 of the second lens and the third lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: -10.3< f 23/(CT 2+ CT 3) < -4.3.

Further, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+CT5)/(ET 4+ET 5) <1.7.

Further, the first reflecting surface and the second reflecting surface are total reflecting surfaces.

Further, the first reflecting surface and the second reflecting surface are both provided with a total reflection film layer.

By applying the technical scheme of the invention, the optical lens group sequentially comprises a first lens, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with focal power and a sixth lens with negative focal power from the object side to the image side along the optical axis; the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, wherein the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the image side surface of the first lens, the second reflection surface is positioned in the paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in the paraxial region of the image side surface of the first lens; the total system length TTL of the optical lens group and the effective focal length f of the optical lens group satisfy the following conditions: TTL/f <0.6.

Through the special structural design of the first lens, the light on the object side enters from the first transmission surface, is reflected to the second reflection surface through the first reflection surface, is reflected to the second transmission surface through the second reflection surface, and enters into the rear system, so that the transmission path of the light on the first lens is effectively planned, and the use reliability of the first lens is improved; the focal power of each lens is reasonably distributed, the characteristic of long focus of the optical lens group is guaranteed, two reflecting surfaces are arranged through the first lens, the transmission of light rays in the first lens is increased, the system length of the optical lens group can be effectively shortened while the characteristic of long focus is guaranteed, and light and thin performance is guaranteed. The ratio between the total length TTL of the system of the optical lens group and the effective focal length f of the optical lens group is in a reasonable range, so that the characteristic of short TTL is realized, and the requirement of miniaturization is met.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic view showing the structure of an optical lens group according to an example I of the present application;

Fig. 2 to 4 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, of the optical lens group in fig. 1;

FIG. 5 is a schematic view showing the structure of an optical lens assembly according to example II of the present invention;

fig. 6 to 8 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, of the optical lens group in fig. 5;

FIG. 9 is a schematic view showing the structure of an optical lens group according to example III of the present invention;

FIGS. 10 to 12 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, of the optical lens group of FIG. 9;

FIG. 13 is a schematic view showing the structure of an optical lens group according to example IV of the present invention;

fig. 14 to 16 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, of the optical lens group in fig. 13;

FIG. 17 is a schematic view showing the structure of an optical lens group according to example five of the present invention;

fig. 18 to 20 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, of the optical lens group in fig. 17;

FIG. 21 is a schematic view showing the structure of an optical lens group according to example six of the present invention;

fig. 22 to 24 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical lens group in fig. 21, respectively.

Wherein the above figures include the following reference numerals:

e1, a first lens; s11, a first transmission surface; s21, a first reflecting surface; s12, a second reflecting surface; s22, a second transmission surface; e2, a second lens; s3, the object side surface of the second lens; s4, the image side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens; s6, the image side surface of the third lens; e4, a fourth lens; s7, the object side surface of the fourth lens; s8, the image side surface of the fourth lens is provided; e5, a fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of a fifth lens; e6, a sixth lens; s11, the object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, an optical filter; s13, the object side surface of the optical filter; s14, an image side surface of the optical filter; s15, an imaging surface.

Detailed Description

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

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.

In the present application, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present application.

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

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

The invention provides an optical lens group, which aims to solve the problem that the long focus and the ultra-thin property of the optical lens group in the prior art are difficult to be simultaneously considered.

Example 1

As shown in fig. 1 to 24, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens, a second lens having negative optical power, a third lens having optical power, a fourth lens having positive optical power, a fifth lens having optical power, and a sixth lens having negative optical power; the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, wherein the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the image side surface of the first lens, the second reflection surface is positioned in the paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in the paraxial region of the image side surface of the first lens; the total system length TTL of the optical lens group and the effective focal length f of the optical lens group satisfy the following conditions: TTL/f <0.6.

Preferably, TTL/f <0.5.

Through the special structural design of the first lens, the light on the object side enters from the first transmission surface, is reflected to the second reflection surface through the first reflection surface, is reflected to the second transmission surface through the second reflection surface, and enters into the rear system, so that the transmission path of the light on the first lens is effectively planned, and the use reliability of the first lens is improved; the focal power of each lens is reasonably distributed, the characteristic of long focus of the optical lens group is guaranteed, two reflecting surfaces are arranged through the first lens, the transmission of light rays in the first lens is increased, the system length of the optical lens group can be effectively shortened while the characteristic of long focus is guaranteed, and light and thin performance is guaranteed. The ratio between the total length TTL of the system of the optical lens group and the effective focal length f of the optical lens group is in a reasonable range, so that the characteristic of short TTL is realized, and the requirement of miniaturization is met.

In addition, the optical lens group is a six-piece type refraction and reflection long-focus system, and the long-focus system can be realized by adopting more design degrees of freedom, and meanwhile, the total length of the system is greatly shortened, so that the miniaturization characteristic is met.

In the present embodiment, the effective focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group satisfy: f/EPD <2.65. The characteristic of large aperture of the optical lens group can be realized by restricting the ratio between the effective focal length F of the optical lens group and the entrance pupil diameter EPD of the optical lens group to be in a reasonable range so that the F number of the system is smaller than 2.65. Preferably, f/EPD <2.60.

In the present embodiment, the total system length TTL of the optical lens assembly and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens element satisfy: 6.8< TTL/BFL <7.6. The ratio between the total system length TTL of the constraint optical lens group and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens is in a reasonable range, so that the characteristic of long focus is guaranteed. Preferably, 7.0< TTL/BFL <7.4.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2<1.6. The optical power of the system can be reasonably distributed by meeting the conditional expression, so that the positive and negative spherical aberration of the front group of lenses and the rear group of lenses can be mutually offset. Preferably 0.4< f6/f2<1.5.

In the present embodiment, the curvature radius R4 of the image side surface of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.0< (R4+R3)/(R4-R3) <2.1. The refractive angle of the system light rays on the second lens can be effectively controlled by meeting the conditional expression, and good processing characteristics of the system are realized. Preferably, 1.0< (R4+R3)/(R4-R3) <2.0.

In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.2< R6/R5<1.2. The sensitivity of the third lens can be effectively reduced by meeting the conditional expression, and the processing and forming characteristics of the third lens are guaranteed. Preferably 0.5< R6/R5<1.1.

In the present embodiment, the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -3.3< f4/R8< -1.6. The field curvature contribution of the image side surface of the fourth lens is in a reasonable range and the field curvature generated by other lenses is balanced by satisfying the conditional expression. Preferably, -3.2< f4/R8< -1.7.

In the present embodiment, the radius of curvature R10 of the image side surface of the fifth lens, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 0.8< (R10+R11)/R9 <1.6. The system can better realize light path deflection and balance the advanced spherical aberration generated by the system by meeting the condition. Preferably 1.0< (R10+R11)/R9 <1.5.

In the present embodiment, the combined focal length f23 of the second lens and the third lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: -10.3< f 23/(CT 2+ CT 3) < -4.3. The conditional expression is satisfied, and the coma performance of the system can be reasonably controlled, so that the system has good optical performance. Preferably, -10.3< f 23/(CT2+CT3) < -4.4.

In the present embodiment, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+CT5)/(ET 4+ET 5) <1.7. The conditional expression is satisfied to control the field curvature contribution of each view field of the system to be in a reasonable range, balance the field curvature generated by other lenses and effectively improve the resolution. Preferably, 1.1< (ct4+ct5)/(et4+et5) <1.7.

In this embodiment, the first reflective surface and the second reflective surface are total reflective surfaces. That is, the first reflecting surface and the second reflecting surface have total reflection, and the total length of the system can be effectively shortened while the long focus is satisfied by reasonably setting the total reflection ranges of the first reflecting surface and the second reflecting surface.

In this embodiment, the first reflecting surface and the second reflecting surface are both provided with a total reflection film layer. By plating the total reflection film layers on the first reflection surface and the second reflection surface, the twice reflection of the first lens can be realized, and the aim of shortening the total length of the long-focus system is fulfilled.

Example two

As shown in fig. 1 to 24, the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens, a second lens having negative optical power, a third lens having optical power, a fourth lens having positive optical power, a fifth lens having optical power, and a sixth lens having negative optical power; the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, wherein the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the image side surface of the first lens, the second reflection surface is positioned in the paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in the paraxial region of the image side surface of the first lens; the effective focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group satisfy: f/EPD <2.65.

Preferably, f/EPD <2.60.

Through the special structural design of the first lens, the light on the object side enters from the first transmission surface, is reflected to the second reflection surface through the first reflection surface, is reflected to the second transmission surface through the second reflection surface, and enters into the rear system, so that the transmission path of the light on the first lens is effectively planned, and the use reliability of the first lens is improved; the focal power of each lens is reasonably distributed, the characteristic of long focus of the optical lens group is guaranteed, two reflecting surfaces are arranged through the first lens, the transmission of light rays in the first lens is increased, the system length of the optical lens group can be effectively shortened while the characteristic of long focus is guaranteed, and light and thin performance is guaranteed. The characteristic of large aperture of the optical lens group can be realized by restricting the ratio between the effective focal length F of the optical lens group and the entrance pupil diameter EPD of the optical lens group to be in a reasonable range so that the F number of the system is smaller than 2.65.

In addition, the optical lens group is a six-piece type refraction and reflection long-focus system, and the long-focus system can be realized by adopting more design degrees of freedom, and meanwhile, the total length of the system is greatly shortened, so that the miniaturization characteristic is met.

In the present embodiment, the total system length TTL of the optical lens assembly and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens element satisfy: 6.8< TTL/BFL <7.6. The ratio between the total system length TTL of the constraint optical lens group and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens is in a reasonable range, so that the characteristic of long focus is guaranteed. Preferably, 7.0< TTL/BFL <7.4.

In this embodiment, the total system length TTL of the optical lens group and the effective focal length f of the optical lens group satisfy: TTL/f <0.6. The ratio between the total length TTL of the system of the optical lens group and the effective focal length f of the optical lens group is in a reasonable range, so that the characteristic of short TTL is realized, and the requirement of miniaturization is met. Preferably, TTL/f <0.5.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2<1.6. The optical power of the system can be reasonably distributed by meeting the conditional expression, so that the positive and negative spherical aberration of the front group of lenses and the rear group of lenses can be mutually offset. Preferably 0.4< f6/f2<1.5.

In the present embodiment, the curvature radius R4 of the image side surface of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.0< (R4+R3)/(R4-R3) <2.1. The refractive angle of the system light rays on the second lens can be effectively controlled by meeting the conditional expression, and good processing characteristics of the system are realized. Preferably, 1.0< (R4+R3)/(R4-R3) <2.0.

In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.2< R6/R5<1.2. The sensitivity of the third lens can be effectively reduced by meeting the conditional expression, and the processing and forming characteristics of the third lens are guaranteed. Preferably 0.5< R6/R5<1.1.

In the present embodiment, the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -3.3< f4/R8< -1.6. The field curvature contribution of the image side surface of the fourth lens is in a reasonable range and the field curvature generated by other lenses is balanced by satisfying the conditional expression. Preferably, -3.2< f4/R8< -1.7.

In the present embodiment, the radius of curvature R10 of the image side surface of the fifth lens, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 0.8< (R10+R11)/R9 <1.6. The system can better realize light path deflection and balance the advanced spherical aberration generated by the system by meeting the condition. Preferably 1.0< (R10+R11)/R9 <1.5.

In the present embodiment, the combined focal length f23 of the second lens and the third lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: -10.3< f 23/(CT 2+ CT 3) < -4.3. The conditional expression is satisfied, and the coma performance of the system can be reasonably controlled, so that the system has good optical performance. Preferably, -10.3< f 23/(CT2+CT3) < -4.4.

In the present embodiment, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+CT5)/(ET 4+ET 5) <1.7. The conditional expression is satisfied to control the field curvature contribution of each view field of the system to be in a reasonable range, balance the field curvature generated by other lenses and effectively improve the resolution. Preferably, 1.1< (ct4+ct5)/(et4+et5) <1.7.

In this embodiment, the first reflective surface and the second reflective surface are total reflective surfaces. That is, the first reflecting surface and the second reflecting surface have total reflection, and the total length of the system can be effectively shortened while the long focus is satisfied by reasonably setting the total reflection ranges of the first reflecting surface and the second reflecting surface.

In this embodiment, the first reflecting surface and the second reflecting surface are both provided with a total reflection film layer. By plating the total reflection film layers on the first reflection surface and the second reflection surface, the twice reflection of the first lens can be realized, and the aim of shortening the total length of the long-focus system is fulfilled.

The optical lens set may optionally further include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.

The optical lens group in the present application may employ a plurality of lenses, for example, the six lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the aperture of the optical lens group can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the optical lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like. The left side is the object side and the right side is the image side.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, those skilled in the art will appreciate that the number of lenses making up an optical lens set can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the optical lens group is not limited to include six lenses. The optical lens set may also include other numbers of lenses, if desired.

Examples of specific surface patterns and parameters applicable to the optical lens group of the above embodiment are further described below with reference to the drawings.

Any of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 4, an optical lens group according to an example one of the present application is described. Fig. 1 is a schematic view showing the structure of an optical lens group of example one.

As shown in fig. 1, the optical lens assembly sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter E7, and the imaging surface S15.

The first lens E1 has positive optical power, the second reflecting surface S12 of the first lens is concave, and the second transmitting surface S22 of the first lens is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, while the image-side surface S12 of the sixth lens element is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The first lens E1 further has a first transmissive surface S11 and a first reflective surface S21. Light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical lens group is 15.00mm, the full field angle FOV of the optical lens group is 15.3 °, the total system length TTL of the optical lens group is 6.09mm and the image height ImgH is 2.04mm.

Table 1 shows the basic structural parameters of the optical lens group of example one, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 1

In the first example, the object side surface and the image side surface of any one of the first reflective surface S21 to the image side surface S12 of the sixth lens element are aspheric, and the surface shape of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A4, A6, A8, A10, A12, A14 that can be used for each of the aspherical mirrors in example one are given in Table 2 below.

Face number

A4

A6

A8

A10

A12

A14

S21

6.9785E-04

8.4753E-06

1.9044E-07

1.7332E-09

2.0133E-10

0.0000E+00

S12

1.8580E-02

-1.7690E-03

5.0193E-04

-4.9851E-05

0.0000E+00

0.0000E+00

S22(STO)

6.9785E-04

8.4753E-06

1.9044E-07

1.7332E-09

2.0133E-10

0.0000E+00

S3

9.1147E-01

-1.7987E+00

3.4820E+00

-4.7796E+00

3.9754E+00

-1.4755E+00

S4

7.0026E-01

-1.4132E+00

1.8098E+00

-1.5082E+00

2.0393E-01

0.0000E+00

S5

-4.5831E-01

-1.3957E-01

7.5082E-02

-3.2560E-02

9.0854E-17

0.0000E+00

S6

-3.9960E-01

-1.3093E-02

1.5809E-01

1.4057E-01

-4.3555E-16

0.0000E+00

S7

5.3046E-02

-3.1245E-01

5.1453E-01

-3.0667E-01

4.3712E-09

0.0000E+00

S8

-1.8614E-01

3.0365E-01

-1.6387E-01

2.8339E-02

-4.5417E-07

0.0000E+00

S9

-3.2134E-01

3.1481E-01

-1.5534E-01

2.8806E-02

-3.1099E-07

0.0000E+00

S10

-9.3351E-02

5.1488E-02

-9.3510E-03

1.8889E-03

-4.4831E-04

0.0000E+00

S11

-2.7684E-02

2.6121E-02

1.4405E-02

-7.2288E-03

9.2936E-04

0.0000E+00

S12

-1.3808E-01

5.5985E-02

-1.8899E-02

2.7980E-03

-1.0907E-04

0.0000E+00

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve for an optical lens set of example one, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical lens set. Fig. 3 shows an astigmatism curve of the optical lens group of example one, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 4 shows distortion curves of an optical lens group of example one, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 2 to fig. 4, the optical lens set of example one can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, an optical lens group of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of the structure of an optical lens group of example two.

As shown in fig. 5, the optical lens assembly sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter E7, and the imaging surface S15.

The first lens E1 has positive optical power, the second reflecting surface S12 of the first lens is concave, and the second transmitting surface S22 of the first lens is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, while the image-side surface S12 of the sixth lens element is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The first lens E1 further has a first transmissive surface S11 and a first reflective surface S21. Light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical lens group is 14.73mm, the full field angle FOV of the optical lens group is 16.0 °, the total system length TTL of the optical lens group is 6.03mm and the image height ImgH is 2.15mm.

Table 3 shows the basic structural parameters of the optical lens group of example two, in which the units of radius of curvature, thickness/distance, focal length and effective radius are all millimeters (mm).

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

S21

6.6785E-04

8.2797E-06

1.8092E-07

2.6806E-09

1.8371E-10

0.0000E+00

S12

1.5357E-02

-1.5091E-03

3.9133E-04

-3.1478E-05

0.0000E+00

0.0000E+00

S22(STO)

6.6785E-04

8.2797E-06

1.8092E-07

2.6806E-09

1.8371E-10

0.0000E+00

S3

8.2253E-01

-1.4675E+00

2.7563E+00

-3.6959E+00

2.9957E+00

-1.0327E+00

S4

6.2494E-01

-1.2723E+00

1.8417E+00

-2.0017E+00

7.3142E-01

0.0000E+00

S5

-5.0156E-01

-9.9594E-02

1.8334E-01

-4.1531E-02

-8.2791E-16

0.0000E+00

S6

-4.1726E-01

6.7185E-02

2.0460E-01

1.2886E-01

-1.3308E-15

0.0000E+00

S7

6.4028E-02

-2.9762E-01

4.6981E-01

-3.0522E-01

4.3712E-09

0.0000E+00

S8

-1.0972E-01

2.8243E-01

-1.7095E-01

3.0576E-02

-4.5417E-07

0.0000E+00

S9

-3.1621E-01

2.8206E-01

-1.5646E-01

3.3785E-02

-3.1099E-07

0.0000E+00

S10

-1.2871E-01

5.4249E-02

-9.0440E-03

1.8294E-03

-4.4831E-04

0.0000E+00

S11

-8.2142E-03

4.6704E-02

6.0603E-03

-8.0516E-03

1.4599E-03

0.0000E+00

S12

-1.5076E-01

7.6458E-02

-2.8628E-02

5.2126E-03

-3.6921E-04

0.0000E+00

TABLE 4 Table 4

Fig. 6 shows an on-axis chromatic aberration curve for an optical lens set of example two, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical lens set. Fig. 7 shows an astigmatism curve of the optical lens group of example two, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 8 shows a distortion curve of the optical lens group of example two, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 6 to 8, the optical lens set of example two can achieve good imaging quality.

Example three

As shown in fig. 9 to 12, an optical lens group of example three of the present application is described. Fig. 9 shows a schematic diagram of the structure of an optical lens group of example three.

As shown in fig. 9, the optical lens assembly sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter E7, and the imaging surface S15.

The first lens E1 has positive optical power, the second reflecting surface S12 of the first lens is concave, and the second transmitting surface S22 of the first lens is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, while the image-side surface S12 of the sixth lens element is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The first lens E1 further has a first transmissive surface S11 and a first reflective surface S21. Light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical lens group is 15.07mm, the full field angle FOV of the optical lens group is 15.9 °, the total system length TTL of the optical lens group is 6.16mm and the image height ImgH is 2.15mm.

Table 5 shows the basic structural parameters of the optical lens group of example three, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

S21

6.6780E-04

8.3541E-06

1.8346E-07

2.5430E-09

1.8136E-10

0.0000E+00

S12

1.5368E-02

-1.3411E-03

3.6126E-04

-2.6587E-05

0.0000E+00

0.0000E+00

S22(STO)

6.6780E-04

8.3541E-06

1.8346E-07

2.5430E-09

1.8136E-10

0.0000E+00

S3

8.2577E-01

-1.4696E+00

2.6046E+00

-3.2396E+00

2.3986E+00

-7.5809E-01

S4

6.4698E-01

-1.2704E+00

1.7301E+00

-1.7079E+00

5.4071E-01

0.0000E+00

S5

-4.7278E-01

-7.0780E-02

1.6297E-01

-7.7634E-02

7.6919E-17

0.0000E+00

S6

-4.2019E-01

6.1772E-02

2.0009E-01

9.1216E-02

-4.1623E-16

0.0000E+00

S7

4.1494E-02

-3.0257E-01

4.7059E-01

-2.6930E-01

4.3712E-09

0.0000E+00

S8

-1.4558E-01

2.9134E-01

-1.6987E-01

3.0422E-02

-4.5417E-07

0.0000E+00

S9

-3.0538E-01

2.9554E-01

-1.5339E-01

3.1399E-02

-3.1099E-07

0.0000E+00

S10

-1.0881E-01

5.4362E-02

-9.2205E-03

1.8313E-03

-4.4831E-04

0.0000E+00

S11

-1.9308E-02

5.0692E-02

-5.7862E-04

-4.3982E-03

8.3121E-04

0.0000E+00

S12

-1.4295E-01

7.2504E-02

-2.7462E-02

5.3280E-03

-4.2342E-04

0.0000E+00

TABLE 6

Fig. 10 shows an on-axis chromatic aberration curve for the optical lens set of example three, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical lens set. Fig. 11 shows an astigmatism curve of the optical lens group of example three, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 12 shows a distortion curve of the optical lens group of example three, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 10 to 12, the optical lens set of example three can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an optical lens group of example four of the present application is described. Fig. 13 shows a schematic view of the structure of an optical lens group of example four.

As shown in fig. 13, the optical lens assembly sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter E7, and the imaging surface S15.

The first lens E1 has positive optical power, the second reflecting surface S12 of the first lens is concave, and the second transmitting surface S22 of the first lens is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The first lens E1 further has a first transmissive surface S11 and a first reflective surface S21. Light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical lens group is 15.01mm, the full field angle FOV of the optical lens group is 16.2 °, the total system length TTL of the optical lens group is 6.70mm and the image height ImgH is 2.15mm.

Table 7 shows a basic structural parameter table of the optical lens group of example four, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

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TABLE 8

Fig. 14 shows an on-axis chromatic aberration curve for the optical lens set of example four, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical lens set. Fig. 15 shows an astigmatism curve of the optical lens group of example four, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 16 shows distortion curves of the optical lens group of example four, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 14 to 16, the optical lens set provided in example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an optical lens group of example five of the present application is described. Fig. 17 shows a schematic diagram of the structure of an optical lens group of example five.

As shown in fig. 17, the optical lens assembly sequentially includes, from an object side to an image side: the optical system comprises a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

The first lens E1 has positive optical power, the second reflecting surface S12 of the first lens is concave, and the second transmitting surface S22 of the first lens is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, while the image-side surface S12 of the sixth lens element is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The first lens E1 further has a first transmissive surface S11 and a first reflective surface S21. Light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical lens group is 14.97mm, the full field angle FOV of the optical lens group is 16.1 °, the total system length TTL of the optical lens group is 6.70mm and the image height ImgH is 2.15mm.

Table 9 shows a basic structural parameter table of the optical lens group of example five, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

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Table 10

Fig. 18 shows an on-axis chromatic aberration curve for the optical lens set of example five, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical lens set. Fig. 19 shows an astigmatism curve of the optical lens group of example five, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 20 shows a distortion curve of the optical lens group of example five, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 18 to 20, the optical lens set provided in example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an optical lens group of example six of the present application is described. Fig. 21 shows a schematic view of the structure of an optical lens group of example six.

As shown in fig. 21, the optical lens assembly sequentially includes, from an object side to an image side: the optical system comprises a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

The first lens E1 has positive optical power, the second reflecting surface S12 of the first lens is concave, and the second transmitting surface S22 of the first lens is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, while the image-side surface S12 of the sixth lens element is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The first lens E1 further has a first transmissive surface S11 and a first reflective surface S21. Light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical lens group is 14.38mm, the full field angle FOV of the optical lens group is 16.8 °, the total system length TTL of the optical lens group is 6.70mm and the image height ImgH is 2.15mm.

Table 11 shows a basic structural parameter table of the optical lens group of example six, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 11

Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example six, where each of the aspherical surface types can be defined by equation (1) given in example one above.

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Table 12

Fig. 22 shows an on-axis chromatic aberration curve of the optical lens group of example six, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical lens group. Fig. 23 shows an astigmatism curve of the optical lens group of example six, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 24 shows a distortion curve of the optical lens group of example six, which represents distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 22 to 24, the optical lens group given in example six can achieve good imaging quality.

In summary, examples one to six satisfy the relationships shown in table 13, respectively.

Condition/example	1	2	3	4	5	6
							TTL/f	0.41	0.41	0.41	0.45	0.45	0.47
f/EPD	2.59	2.58	2.58	2.41	2.28	2.15
							TTL/BFL	7.33	7.03	7.18	7.13	7.17	7.13
f6/f2	0.60	0.45	0.50	1.42	1.09	0.94
							(R4+R3)/(R4-R3)	1.99	1.99	1.92	1.15	1.10	1.27
R6/R5	1.06	0.99	0.92	0.85	0.73	0.54
							f4/R8	-2.68	-3.15	-2.72	-2.18	-1.72	-1.74
(R10+R11)/R9	1.07	1.28	1.14	1.09	1.43	1.49
							f23/(CT2+CT3)	-8.61	-10.24	-8.56	-4.42	-4.84	-4.62
(CT4+CT5)/(ET4+ET5)	1.27	1.17	1.19	1.57	1.57	1.62
							FOV(°)	15.3	16.0	15.9	16.2	16.1	16.8

Table 13 table 14 shows the effective focal lengths f of the optical lens groups of examples one to six, the effective focal lengths f1 to f6 of the respective lenses, and the like.

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TABLE 14

The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described optical lens group.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (16)

1. An optical lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens including a first transmissive surface located at an outer circumference of an object side surface of the first lens, a first reflective surface located at an outer circumference of an image side surface of the first lens, a second reflective surface located at a paraxial region of the object side surface of the first lens, and a second transmissive surface located at a paraxial region of the image side surface of the first lens;

A second lens having negative optical power;

a third lens having optical power;

a fourth lens having positive optical power;

a fifth lens having optical power;

a sixth lens having negative optical power;

the total system length TTL of the optical lens group and the effective focal length f of the optical lens group meet the following conditions:

TTL/f<0.6；

the optical lens group is composed of the first lens to the sixth lens, and the effective focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group satisfy: f/EPD <2.65; total length of system of the optical lens group

The on-axis distance BFL between the TTL and the image side surface of the sixth lens element to the imaging surface satisfies: 6.8< TTL/BFL <7.6; the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2<1.6.

2. The optical lens set of claim 1, wherein a radius of curvature R5 of the object side of the third lens and a radius of curvature R6 of the image side of the third lens satisfy: 0.2< R6/R5<1.2.

3. The optical lens set of claim 1, wherein an effective focal length f4 of the fourth lens and a radius of curvature R8 of an image side of the fourth lens satisfy: -3.3< f4/R8< -1.6.

4. The optical lens set according to claim 1, wherein a radius of curvature R10 of the image side of the fifth lens, a radius of curvature R11 of the object side of the sixth lens, and a radius of curvature R9 of the object side of the fifth lens satisfy: 0.8< (R10+R11)/R9 <1.6.

5. The optical lens set according to claim 1, wherein a combined focal length f23 of the second lens and the third lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: -10.3< f 23/(CT 2+ CT 3) < -4.3.

6. The set of optical lenses according to claim 1, in which between the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens: 1.0< (CT4+CT5)/(ET 4+ET 5) <1.7.

7. The optical lens assembly of claim 1, wherein the first reflective surface and the second reflective surface are total reflective surfaces.

8. The optical lens assembly of claim 1, wherein the first reflective surface and the second reflective surface are each provided with a total reflection film layer thereon.

9. An optical lens assembly, comprising, in order from an object side to an image side along an optical axis:

a first lens including a first transmissive surface located at an outer circumference of an object side surface of the first lens, a first reflective surface located at an outer circumference of an image side surface of the first lens, a second reflective surface located at a paraxial region of the object side surface of the first lens, and a second transmissive surface located at a paraxial region of the image side surface of the first lens;

a second lens having negative optical power;

a third lens having optical power;

a fourth lens having positive optical power;

a fifth lens having optical power;

a sixth lens having negative optical power;

wherein, the effective focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group satisfy:

f/EPD<2.65；

the optical lens group is composed of the first lens and the sixth lens, and the total system length TTL of the optical lens group and the on-axis distance BFL from the image side surface to the imaging surface of the sixth lens satisfy: 6.8< TTL/BFL <7.6; the total system length TTL of the optical lens group and the effective focal length f of the optical lens group are as follows: TTL/f <0.6; the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2<1.6; the curvature radius R4 of the image side surface of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy the following conditions: 1.0< (R4+R3)/(R4-R3) <2.1.

10. The set of optical lenses of claim 9, in which the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 0.2< R6/R5<1.2.

11. The set of optical lenses according to claim 9, in which between the effective focal length f4 of the fourth lens and the radius of curvature R8 of the image side of the fourth lens: -3.3< f4/R8< -1.6.

12. The optical lens set according to claim 9, wherein a radius of curvature R10 of the image side of the fifth lens, a radius of curvature R11 of the object side of the sixth lens, and a radius of curvature R9 of the object side of the fifth lens satisfy: 0.8< (R10+R11)/R9 <1.6.

13. The optical lens set according to claim 9, wherein a combined focal length f23 of the second lens and the third lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: -10.3< f 23/(CT 2+ CT 3) < -4.3.

14. The set of optical lenses of claim 9, in which the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+CT5)/(ET 4+ET 5) <1.7.

15. The optical lens assembly of claim 9, wherein the first reflective surface and the second reflective surface are total reflective surfaces.

16. The optical lens assembly of claim 9, wherein the first reflective surface and the second reflective surface are each provided with a total reflection film layer thereon.