CN106324797A - Optical lens - Google Patents

Abstract

The present invention provides an optical lens, in order from an object side to an image side, comprising: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens has negative diopter, the second lens has diopter, the third lens has diopter, the fourth lens has positive diopter, and the fifth lens, the sixth lens and the seventh lens have diopter. Either one of the second lens and the third lens has a positive refractive power, and the other has a negative refractive power; either one of the fifth lens and the sixth lens has a positive refractive power, and the other has a negative refractive power. The object side surface of the first lens element has an curvature of curvature R1, the image side surface of the first lens element has a curvature of curvature R2, and-R2/R1-is less than or equal to 0.01.

Description

optical lens

technical field

The invention provides an optical lens, and in particular relates to an optical lens with small volume and good imaging quality.

Background technique

In recent years, due to the ever-changing technology of smart phones and handheld tablet computers, various mobile devices have higher requirements for the optical image quality of their camera devices; and because of the thinner design of mobile devices, the thickness of the optical lens of the camera device also needs Thinned. Optical lenses are usually composed of several lenses. In order to increase the competitive advantage in the market, miniaturization, high image quality and cost reduction have always been the goals of product development.

Therefore, there is an urgent need to propose a new optical lens, which can realize the miniaturization of the optical lens and improve the imaging quality under the premise of reducing the manufacturing cost.

Contents of the invention

The invention relates to an optical lens. On the premise of reducing the manufacturing cost, the optical lens is miniaturized and the imaging quality is improved at the same time.

The invention provides an optical lens. The optical lens includes sequentially from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has a negative diopter, the second lens has a diopter, the third lens has a diopter, the fourth lens has a positive diopter, the fifth lens, the sixth lens and the seventh lens have a diopter. Any one of the second lens and the third lens has a positive diopter, and the other has a negative diopter; any one of the fifth lens and the sixth lens has a positive diopter, and the other has a negative diopter.

The invention further provides an optical lens. The optical lens includes sequentially from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has a negative diopter, the second lens has a diopter, the third lens has a diopter, the fourth lens has a positive diopter, the fifth lens has a diopter, the sixth lens has a diopter, and the seventh lens has a diopter. The object-side surface of the first lens has a curvature R1, the image-side surface of the first lens has a curvature R2, and │R2/R1│≦0.01.

Compared with the prior art, the beneficial effect of the present invention is that the optical lens of the present invention can not only reduce the manufacturing cost, but also realize the miniaturization of the optical lens and improve the imaging quality.

In order to have a better understanding of the above and other aspects of the present invention, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

Fig. 1 illustrates the optical lens of an embodiment of the present invention;

FIG. 2A shows a curve diagram of field curvature of the optical lens of FIG. 1;

FIG. 2B shows a curve diagram of distortion (distortion) of the optical lens of FIG. 1;

Fig. 3 illustrates the optical lens of another embodiment of the present invention;

FIG. 4 illustrates an optical lens according to another embodiment of the present invention.

detailed description

Various embodiments of the present invention will be described in detail below and illustrated with accompanying drawings. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments, and any easy replacement, modification, and equivalent changes of any of the embodiments are included in the scope of this case, and the following patent scope is allow. In the description of the specification, many specific details are provided in order to enable readers to have a more complete understanding of the present invention; however, the present invention may still be practiced under the premise of omitting some or all of these specific details. Also, well-known steps or elements have not been described in detail in order to avoid unnecessarily limiting the invention. The same or similar elements in the drawings will be denoted by the same or similar symbols. It should be noted that the drawings are for illustrative purposes only, and do not represent the actual size or quantity of components, unless otherwise specified.

FIG. 1 shows an optical lens OL1 according to an embodiment of the present invention. In order to show the features of this embodiment, only structures related to this embodiment are shown, and other structures are omitted. The optical lens OL1 of this embodiment may be a wide-angle lens, which may be but not limited to a fixed-focus wide-angle lens. The optical lens OL1 can be applied to a device with an image projection or capture function, and the device includes but is not limited to a handheld computer system, a handheld communication system, a vehicle camera lens, a surveillance system, a digital camera, a digital video camera or a projector .

In this embodiment, the optical lens OL1 may include a first lens group and a second lens group. Wherein, the first lens group includes one or more lenses, and its overall positive diopter; the second lens group includes one or more lenses, and its overall negative diopter.

As shown in FIG. 1 , the optical lens OL1 mainly includes in sequence from the object side (object side) to the image-forming side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, The fifth lens L5, the sixth lens L6 and the seventh lens L7. Among them, the first lens L1, the second lens L2 and the third lens L3 can belong to the first lens group, and the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can belong to the second lens group. In addition, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be arranged on an optical axis OA.

In one embodiment, on the optical axis OA, the first lens L1 may have a diopter, such as a negative diopter; the second lens L2 and the third lens L3 may have a diopter, such as a positive diopter or a negative diopter respectively; the fourth lens L4 can have diopter, such as positive diopter; fifth lens L5 and sixth lens L6 can respectively have diopter, such as positive diopter or negative diopter respectively; seventh lens L7 can have diopter, such as negative diopter.

In addition, in one embodiment, the diopters of the second lens L2 and the third lens L3 can be set in conjunction with each other. For example, if one of the second lens L2 and the third lens L3 has a positive diopter, the other can have a negative diopter.

Furthermore, in yet another embodiment, the diopters of the fifth lens L5 and the sixth lens L6 can also be set in conjunction with each other. For example, if one of the fifth lens L5 and the sixth lens L6 has a positive diopter, the other can have a negative diopter, but the present invention is not limited thereto.

In one embodiment, the optical lens OL1 can satisfy the condition of │R2/R1│≦0.01. Here, R1 is the curvature of the object-side surface S1 of the first lens L1, and R2 is the curvature of the image-side surface S2 of the first lens L1.

In one embodiment, the optical lens OL1 may satisfy the conditions of 0.25≦F/TTL, F/TTL≦0.45 and/or 0.25≦F/TTL≦0.45. Among them, F is the overall focal length of the optical lens OL1; TTL can be defined as the distance from the object-side surface S1 of the first lens L1 to the imaging plane I along the optical axis OA, or can be defined as the center of the object-side surface S1 of the first lens L1 The substantially vertical distance from the point to the imaging plane I.

In one embodiment, the optical lens OL1 may satisfy the conditions of 0.2≦F/Y, F/Y≦0.6 and/or 0.2≦F/Y≦0.6. Wherein, Y is the image height of the optical lens OL1. Furthermore, in another embodiment, the optical lens OL1 can satisfy at least one condition such as 0.25≦F/Y, 0.3≦F/Y, F/Y≦0.55 and F/Y≦0.5.

In one embodiment, the optical lens OL1 can satisfy the condition of (FNO*TTL)/(FOV*Y)≦0.03. Wherein, FOV is the field of view angle of the optical lens OL1, and FNO is the aperture of the optical lens OL1. Furthermore, in another embodiment, the optical lens OL1 can satisfy the condition of 0.01≦(FNO*TTL)/(FOV*Y)≦0.03.

In one embodiment, the optical lens OL1 may satisfy the conditions of 0.0≦d/F, d/F≦0.1 and/or 0.0≦d/F≦0.1. Among them, d can be defined as the distance between the first lens group and the second lens group, or can be defined as the distance from the image-side surface S6 of the third lens L3 to the object-side surface S7 of the fourth lens L4 along the optical axis OA. distance. Furthermore, in another embodiment, the optical lens OL1 can satisfy the conditions of 0.0≦d/F≦0.08, 0.05≦d/F≦0.1 or 0.05≦d/F≦0.08.

In addition, in one embodiment, at least one of the first lens L1, the second lens L2 and the third lens L3 can be a glass lens made of glass material; in another embodiment, the second lens L2 At least one of the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 may be a plastic lens made of plastic material.

For example, the first lens L1 can be a glass lens, and at least one of the first and second lenses L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be Plastic lenses are used; or, the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 can all use plastic lenses, which is not intended to limit the present invention. Among them, the material of the plastic lens may include, but not limited to, polycarbonate (polycarbonate), cycloolefin copolymer (such as APEL), and polyester resin (such as OKP4 or OKP4HT), etc., or at least include the aforementioned three A mixture of materials.

In one embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be spherical lenses, aspheric lenses and / or freeform lens.

Specifically, each free-form lens has at least one free-form surface, meaning that the object-side surface and/or image-side surface of the free-form lens is a free-form surface; and each aspheric lens has at least one aspheric surface, meaning That is, the object-side surface and/or the image-side surface of the aspheric lens is an aspheric surface. And each aspheric surface can satisfy the following mathematical formula:

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \&lsqb;</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; C</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; \&Sigma;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>$

Among them, Z is the coordinate value in the direction of the optical axis OA, with the light transmission direction as the positive direction, A4, A6, A8, A10, A12, A14 and A16 are the aspheric coefficients, K is the quadric surface constant, C=1/ R, R is the radius of curvature, Y is the coordinate value perpendicular to the direction of the optical axis OA, and the direction away from the optical axis OA is the positive direction. In addition, the values of various parameters or coefficients of each aspheric surface mathematical formula can be set separately to determine the focal length of each position point on the aspheric surface.

In another embodiment, the first lens L1 can be a spherical lens, and at least one of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 They can be aspheric lens or free-form surface lens respectively.

In yet another embodiment, the first lens L1 can be a spherical lens, the second lens L2 and/or the third lens L3 can also be a spherical lens, and the fourth lens L4, the fifth lens L5, the sixth lens L6 and the At least one of the seven lenses L7 may be an aspheric lens or a free-form surface lens.

In yet another embodiment, the first lens L1 can be a spherical lens, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical. lens. For example, the first lens L1 can be a spherical lens in which the object-side surface S1 and the image-side surface S2 are all spherical surfaces, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens The lens L6 and the seventh lens L7 can be aspheric lenses whose object-side surface and image-side surface are both aspheric surfaces. Further, the object-side surface S1 of the first lens L1 may also adopt a surface with a substantially maximum refractive index, for example, a refractive index approaching infinity. In other words, the object-side surface S1 of the first lens L1 may be substantially flat.

In addition, in one embodiment, the object-side surface S1 of the first lens L1 can approach to a plane or be substantially a plane, and it can have a positive refractive power, a negative refractive power, or a substantially maximum refractive power at the optical axis OA. The refractive power of the value; the image-side surface S2 may be a concave surface concave toward the object side, which has a positive refractive power at the optical axis OA. Further, the first lens L1 can be a lens with negative diopter, including but not limited to convex-concave lens, bi-concave lens or plano-concave lens with negative diopter, such as convex-concave glass lens, bi-concave glass lens or plano-concave glass lens, and like The side surface S2 may be a spherical surface.

The object side surfaces S3, S5 of the second lens L2 and the third lens L3 may be convex surfaces protruding toward the object side, which have positive refractive power at the optical axis OA; the image side surfaces S4, S6 may be respectively toward the object side A concave concave surface that is concave or a convex surface that is convex towards the image side may have a refractive power at the optical axis OA, for example a positive or negative refractive power. Further, the second lens L2 and the third lens L3 can respectively adopt lenses with diopters, such as lenses with negative diopters or lenses with positive diopters, including but not limited to convex-convex lenses with negative diopters or biconvex lenses with positive diopters, For example, it is a convex-concave plastic lens, a biconvex glass lens, a convex-concave glass lens or a biconvex plastic lens, and the object-side surfaces S3 , S5 and the image-side surfaces S4 , S6 can be spherical surfaces or aspherical surfaces respectively.

The object-side surface S7 of the fourth lens L4 may be a convex surface protruding toward the object side, which has a positive refractive power at the optical axis OA; the image-side surface S8 may be a convex surface protruding toward the image side, which has a positive refractive power at the optical axis OA. has a negative refractive index. Further, the fourth lens L4 can be a lens with positive diopter, including but not limited to a biconvex lens with positive diopter, such as a biconvex plastic lens or a biconvex glass lens, and the object-side surface S7 and the image-side surface S8 can be respectively be a spherical surface or an aspheric surface.

The object-side surface S9 of the fifth lens L5 may be a concave surface concave toward the image side or a convex surface convex toward the object side, which has a refractive power at the optical axis OA, such as a negative refractive power or a positive refractive power. ; The image-side surface S10 can be a concave surface concave toward the object side or a convex surface convex toward the image side, which has a refractive power at the optical axis OA, such as positive or negative refractive power. Further, the fifth lens L5 can adopt a lens with negative diopter or a lens with positive diopter, including but not limited to a biconcave lens with negative diopter or a biconvex lens with positive diopter, such as biconcave plastic lens, biconvex plastic lens, double The concave glass lens or biconvex glass lens, and the object-side surface S9 and the image-side surface S10 can be spherical surfaces or aspheric surfaces respectively.

The object-side surface S11 of the sixth lens L6 may be a convex surface protruding toward the object side, which has a positive refractive power at the optical axis OA; the image-side surface S12 may be a convex surface protruding toward the image side or concave toward the object side. A concave surface having an optical power at the optical axis OA, for example negative or positive. Further, the sixth lens L6 can be a lens with positive diopter or a lens with negative diopter, including but not limited to biconvex lens with positive diopter or convex-concave lens with negative diopter, such as biconvex plastic lens, convex-concave plastic lens, double The convex glass lens or convex-concave glass lens, and the object-side surface S11 and the image-side surface S12 can be spherical surfaces or aspherical surfaces respectively.

The object-side surface S13 of the seventh lens L7 can be a concave surface that is concave toward the image side or a convex surface that is convex toward the object side, and it can have a negative refractive power at the optical axis OA; Convex surface convex on the optical axis OA, and concave surface concave toward the object side near the optical axis OA, which has a positive refractive power at the optical axis OA. Further, the seventh lens L7 can be a lens with negative diopter, including but not limited to a biconcave lens with negative diopter or a convex-concave lens with negative diopter, such as a biconcave plastic lens, a convex-concave plastic lens, a biconcave glass lens or a convex-concave lens. The glass lens, and the object-side surface S13 and the image-side surface S14 can be spherical surfaces or aspherical surfaces, respectively.

In one embodiment, the first lens L1 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 are aspherical lenses with diopters. Furthermore, the first lens L1 can be a plano-concave aspheric glass lens with a diopter, the fourth lens L4 can be a biconvex aspheric plastic lens with a positive diopter, and the fifth lens L5, the sixth lens L6 and the seventh lens L7 may be aspherical plastic lenses with diopters, respectively.

In addition, in another embodiment, the diopters of the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 can be interspersed in a positive and negative staggered manner.

Furthermore, in one embodiment, the seventh lens L7 of the optical lens OL1 can be an aspheric lens, and its image-side surface S14 is an aspheric surface including at least one inflection point IF. Wherein, the distance from the inflection point IF to the optical axis OA is h14, and the radius of the seventh lens L7 is H14, and the optical lens OL1 can satisfy 0.5≤│h14/H14│, │h14/H14│≤0.8 and/or The condition of 0.5≤│h14/H14│≤0.8. Further, in another embodiment, the optical lens OL1 can satisfy 0.6≤│h14/H14│, 0.6≤│h14/H14│≤0.8, │h14/H14│≤0.7, 0.5≤│h14/H14│≤ The condition of 0.7 and/or 0.6≤│h14/H14│≤0.7.

Specifically, h14 may be the shortest or vertical distance from the inflection point IF of the seventh lens L7 to the optical axis OA. In addition, the inflection point IF can be located on the image-side surface S14 of the seventh lens L7 from adjacent to the optical axis OA to the periphery of the lens; and H14 can be the effective aperture or optical effective aperture of the seventh lens L7, or the seventh lens The distance from the outer diameter of L7 to the optical axis OA is, for example, the shortest distance or the vertical distance.

In addition, in the embodiment, the optical lens OL1 can also satisfy the condition of │δ7/D7│≦0.4. Wherein, δ7 is an extension length from the intersection of the image-side surface S14 of the seventh lens L7 and the optical axis OA to the position where the inflection point IF is projected onto the optical axis OA; and D7 may be the length of the seventh lens L7 on the optical axis OA Thickness, or the thickness of the center point of the seventh lens L7. Furthermore, in another embodiment, the optical lens OL1 can further satisfy the condition of 0.0≦│δ7/D7│≦0.4, 0.1≦│δ7/D7│≦0.4 or 0.2≦│δ7/D7│≦0.4.

Specifically, if the image-side surface S14 of the seventh lens L7 is an aspheric surface, the surface change of the image-side surface S14 of the seventh lens L7 from the outer diameter to the center point can first extend toward the direction of the imaging plane I, and then reverse The curvature extends in a direction away from the imaging plane I. From this point of view, the inflection point IF of the seventh lens L7 can be said to be the position where the image-side surface S14 of the seventh lens L7 is closest to the imaging plane I.

Moreover, as shown in FIG. 1 , the optical lens OL1 further includes a diaphragm St and/or a protective sheet C. In addition, an image capture unit (not shown) can be arranged on the imaging surface I, which can perform photoelectric conversion on the light beam passing through the optical lens OL1. Wherein, the diaphragm St can be arranged between any two lenses L1-L7 in the optical lens OL1, on the object side of the first lens L1, or between the seventh lens L7 and the imaging surface I, for example, it is arranged on the side of the third lens L3. Between the image side and the object side of the fourth lens L4, but not limited thereto; the protection sheet C may be disposed between the seventh lens L7 and the imaging surface I.

On the other hand, a filter film (not shown) may be formed on the object-side surface S15 and/or the image-side surface S16 of the protective sheet C, which can filter out infrared beams. In addition, the optical lens OL1 can further include a filter (not shown), which can be disposed between the seventh lens L7 and the protective sheet C. Moreover, in another embodiment, the functions of protecting the image capturing unit and filtering the infrared beam can be integrated in the protection sheet C at the same time.

Table 1 lists the detailed information of an embodiment of the optical lens OL1, which includes the radius of curvature, thickness, refractive index, and dispersion coefficient of each lens. The surface code of the lens represents each interface, for example: St represents the position of the stop St, S1 represents the object-side surface S1 of the first lens L1 facing the object side, S2 represents the image-side surface S2 of the first lens L1 facing the image side, etc. . In addition, the thickness represents the distance between the surface and a surface adjacent to the image side, for example, the thickness of the image side surface S1 is the distance between the image side surface S1 and the image side surface S2.

Table I

In addition, if the surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 in Table 1 are aspheric surfaces, the coefficients in the aspheric mathematical formula can be As shown in Table 2.

Table II

S3 S4 S7 S8 S9 K -2.0381E+01 -6.7805E-01 -5.2422E+00 1.4787E+00 6.9541E+00 A4 -1.1974E-02 4.0700E-04 1.0352E-02 5.6866E-02 -6.8508E-02 A6 -1.2076E-03 2.7699E-03 -5.8590E-02 -9.3829E-02 -2.6431E-02 A8 5.0840E-04 7.7018E-04 1.2055E-01 4.4791E-02 3.5627E-02 A10 3.0146E-05 1.2351E-04 -9.1808E-02 5.2620E-02 -2.0676E-03 A12 -7.8386E-06 -3.7435E-04 -4.1860E-01 -1.3440E-01 -2.4837E-02 A14 -7.3220E-07 3.0025E-04 4.5152E-01 6.7459E-02 2.0967E-02 A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 S11 S12 S13 S14 K -9.0878E+00 9.1039E+00 -5.4778E+00 2.8140E+00 -6.6953E-01 A4 -4.7546E-03 1.6814E-02 -6.2190E-02 -7.5311E-02 -1.6900E-01 A6 1.8413E-02 -3.7451E-03 3.2815E-02 -7.0486E-02 6.3491E-02 A8 -1.1565E-02 2.0168E-03 1.5900E-03 1.4699E-01 -1.7815E-02 A10 4.8441E-03 -2.2819E-03 -2.4743E-03 -1.1392E-01 2.9086E-03

A12 4.8895E-04 3.9393E-04 5.4922E-04 4.7981E-02 -2.4265E-04 A14 -5.7720E-04 3.4687E-04 2.1348E-04 -1.0924E-02 3.2774E-06 A16 0.0000E+00 -1.5360E-04 -8.7840E-05 1.0469E-03 6.3107E-07

FIG. 2A illustrates a field curvature curve of the optical lens OL1 according to an embodiment of the present invention. Wherein, the curves T and S respectively show the chromatic aberration of the optical lens OL1 for tangential rays (Tangential Rays) and sagittal rays (Sagittal Rays). The figure shows that both the tangent field curvature and sagittal field curvature of the beam are controlled within a good range.

FIG. 2B shows a distortion curve of the optical lens OL1 according to an embodiment of the present invention. The figure shows that the distortion rate of the beam is controlled within a good range.

FIG. 3 illustrates an optical lens OL2 according to another embodiment of the present invention. The optical lens OL2 of the present embodiment is roughly similar to the optical lens OL1, the main difference lies in the material, appearance or optics of the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7. parameter.

Specifically, as shown in FIG. 3 , the image-side surface S4 of the second lens L2 of the optical lens OL2 may be a convex surface protruding toward the image side, which may have a negative refractive power at the optical axis OA. The second lens L2 can be a biconvex lens with positive diopter, such as a biconvex glass lens or a biconvex plastic lens, and at least one of the object-side surface S3 and the image-side surface S4 can be a spherical surface.

The image-side surface S6 of the third lens L3 may be a concave surface concave toward the object side, which may have a positive refractive power at the optical axis OA. The third lens L3 can be a convex-concave lens with negative diopter, such as a convex-concave plastic lens or a convex-concave glass lens, and the object-side surface S3 can be an aspherical surface.

The object-side surface S9 of the fifth lens L5 may be a convex surface protruding toward the object side, which may have a positive refractive power at the optical axis OA; the image-side surface S10 may be a convex surface protruding toward the image side, which is at the optical axis OA. Can have negative refractive power. The fifth lens L5 can be a biconvex lens with positive diopter, such as a biconvex plastic lens or a biconvex glass lens, and at least one of the object-side surface S9 and the image-side surface S10 can be an aspheric surface.

The image-side surface S12 of sixth lens L6 may be a concave surface concave toward the object side, which may have a positive refractive power at the optical axis OA. The sixth lens L6 can be a convex-concave lens with negative diopter, such as a convex-concave plastic lens or a convex-concave glass lens, and the object-side surface S3 can be an aspherical surface.

The object-side surface S13 of the seventh lens L7 may be a convex surface protruding toward the object side, which may have a negative refractive power at the optical axis OA. The seventh lens L7 can be a convex-concave lens with negative diopter, such as a convex-concave plastic lens or a convex-concave glass lens, and the object-side surface S13 can be an aspherical surface.

Table 3 lists the detailed information of an embodiment of the optical lens OL2, which includes the radius of curvature, thickness, refractive index, dispersion coefficient, etc. of each lens.

Table three

In addition, if the surfaces of the third lens L3 to the seventh lens L7 in Table 3 are aspherical surfaces, then the coefficients in the aspherical formula can be as shown in Table 4.

Table four

S5 S6 S7 S8 S9 K 5.3957E+00 -3.4529E+00 1.8454E+00 1.4110E+01 -2.3345E+01

A4 -8.7272E-02 -4.0097E-02 2.3026E-02 -1.6611E-01 -1.5251E-01 A6 -3.7529E-03 -7.0239E-02 -5.0004E-02 1.8825E-01 1.0004E-01 A8 1.6655E-02 8.3803E-02 1.0248E-02 -1.5807E-01 -9.2584E-02 A10 -3.5032E-04 4.7280E-02 -5.5580E-03 4.6607E-02 3.9566E-02 A12 -2.8231E-03 -1.0646E-01 3.1541E-02 1.8515E-02 -6.4824E-03 A14 -1.3632E-03 -2.3831E-02 -1.5097E-02 -6.0737E-03 1.6355E-03 A16 1.2893E-03 7.9736E-02 -5.1793E-03 -2.7032E-03 -1.4750E-06 S10 S11 S12 S13 S14 K 3.5895E+00 8.5912E+00 -3.2957E-01 -2.2629E-01 -6.1878E+00 A4 4.4216E-02 7.3722E-02 8.0543E-03 -4.0345E-02 -2.2305E-02 A6 -6.4071E-02 -8.4884E-02 -3.0077E-02 6.6159E-03 3.2816E-03 A8 1.2276E-02 2.1237E-02 9.8181E-03 -6.0018E-04 -3.2983E-04 A10 6.0574E-03 7.5277E-04 -8.7080E-04 2.9916E-05 1.6175E-05 A12 -3.0587E-03 -2.0947E-03 -1.7341E-04 -5.6897E-07 5.9075E-08 A14 -7.7033E-04 3.0595E-04 3.4393E-05 -1.5104E-08 -2.8350E-08 A16 7.9097E-04 5.6422E-05 -7.4106E-07 0.0000E+00 0.0000E+00

FIG. 4 illustrates an optical lens OL3 according to yet another embodiment of the present invention. The optical lens OL3 of this embodiment is roughly similar to the optical lens OL1, the main difference lies in the appearance or optical parameters of each lens.

Table 5 lists the detailed information of an embodiment of the optical lens OL3, which includes the radius of curvature, thickness, refractive index, dispersion coefficient, etc. of each lens.

Table five

In addition, if the surfaces of the second lens L2 and the fourth lens L4 to the seventh lens L7 in Table 4 are aspheric surfaces, the coefficients in the aspheric mathematical formula can be as shown in Table 6.

Table six

S3 S4 S7 S8 S9 K -1.1675E+01 -3.2976E-01 -2.9903E+00 1.5910E+00 6.5967E+00 A4 -8.7272E-02 -4.0097E-02 2.3026E-02 -1.6611E-01 -1.5251E-01 A6 -3.7529E-03 -7.0239E-02 -5.0004E-02 1.8825E-01 1.0004E-01 A8 1.6655E-02 8.3803E-02 1.0248E-02 -1.5807E-01 -9.2584E-02 A10 -3.5032E-04 4.7280E-02 -5.5580E-03 4.6607E-02 3.9566E-02

A12 -2.8231E-03 -1.0646E-01 3.1541E-02 1.8515E-02 -6.4824E-03 A14 -1.3632E-03 -2.3831E-02 -1.5097E-02 -6.0737E-03 1.6355E-03 A16 1.2893E-03 7.9736E-02 -5.1793E-03 -2.7032E-03 -1.4750E-06 S10 S11 S12 S13 S14 K -9.4936E+00 1.1134E+01 -5.2660E+00 8.4829E-01 -6.7818E-01 A4 4.4216E-02 7.3722E-02 8.0543E-03 -4.0345E-02 -2.2305E-02 A6 -6.4071E-02 -8.4884E-02 -3.0077E-02 6.6159E-03 3.2816E-03 A8 1.2276E-02 2.1237E-02 9.8181E-03 -6.0018E-04 -3.2983E-04 A10 6.0574E-03 7.5277E-04 -8.7080E-04 2.9916E-05 1.6175E-05 A12 -3.0587E-03 -2.0947E-03 -1.7341E-04 -5.6897E-07 5.9075E-08 A14 -7.7033E-04 3.0595E-04 3.4393E-05 -1.5104E-08 -2.8350E-08 A16 7.9097E-04 5.6422E-05 -7.4106E-07 0.0000E+00 0.0000E+00

In addition, Table 7 lists the comparative data of the examples in Table 1 to Table 6 according to the present invention.

Table seven

Optical Lens OL1 Optical Lens OL2 Optical Lens OL3 f 2.7 3.03 2.86 Y 8.05 9.11 5.86 TTL 8.05 9.11 7.56 d 0.188 0.182 0.151 F/TTL 0.33 0.39 0.37 F/Y 0.33 0.33 0.48 d/F 0.069 0.060 0.053 R1 ∞ ∞ ∞ R2 7.952 1.972 14.861

R2/R1 0.00 0.00 0.00 h14 1.469 2.210 1.568 H14 2.334 3.439 2.291 │h14/H14│ 0.63 0.64 0.68 δ7 0.15 0.25 0.19 D7 0.58 0.75 0.58 │δ7/D7│ 0.26 0.33 0.32 FOV 160 160 120 FNO 2.36 2.83 2.11 (FNO*TTL)/(FOV*Y) 0.014 0.017 0.022

In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. But these changes and modifications should all belong to the scope of protection of the appended claims of the present invention.

Claims (11)

1. an optical lens, it is characterised in that sequentially comprise to image side from thing side: one first lens, One second lens, one the 3rd lens, one the 4th lens, one the 5th lens, one the 6th lens and one the 7th are saturating Mirror, these first lens have negative diopter, and these second lens have diopter, and the 3rd lens have dioptric Degree, the 4th lens have positive diopter, and the 5th lens have diopter, and the 6th lens have dioptric Degree, the 7th lens have diopter, and any one of these second lens and the 3rd lens has positive diopter, And another one has negative diopter；Any one of 5th lens and the 6th lens has positive diopter, and Another one has negative diopter.

2. an optical lens, it is characterised in that sequentially comprise to image side from thing side: one first lens, One second lens, one the 3rd lens, one the 4th lens, one the 5th lens, one the 6th lens and one the 7th are saturating Mirror, these first lens have negative diopter, and these second lens have diopter, and the 3rd lens have dioptric Degree, the 4th lens have positive diopter, and the 5th lens have diopter, and the 6th lens have dioptric Degree, the 7th lens have diopter, and the thing side surface of these the first lens has bent light rate R1, and this is first years old The surface, image side of lens has bent light rate R2, and │ R2/R1 │≤0.01.

3. optical lens as claimed in claim 1 or 2, it is characterised in that further include whole focal length F, And 0.25≤F/TTL and/or F/TTL≤0.45, wherein TTL is that the thing side surface of these the first lens is along one Optical axis is to the distance of an imaging surface, or is that the central point of thing side surface of these the first lens is to the reality of this imaging surface Matter vertical dimension.

4. optical lens as claimed in claim 1 or 2, it is characterised in that further include whole focal length F And an image height Y, and 0.2≤F/Y and/or F/Y≤0.6.

5. optical lens as claimed in claim 1 or 2, it is characterised in that further include a field of view angle FOV, an image height Y and an aperture FNO, and (FNO*TTL)/(FOV*Y)≤0.03, wherein TTL is The thing side surface of these the first lens is along the distance of an optical axis a to imaging surface, or is the thing side table of these the first lens The central point in face is to the essence vertical dimension of this imaging surface.

6. optical lens as claimed in claim 1 or 2, it is characterised in that further include whole focal length F, And the distance between surface, image side and the thing side surface of the 4th lens that d is the 3rd lens, then 0.0≤ D/F and/or d/F≤0.1.

7. optical lens as claimed in claim 1 or 2, it is characterised in that the image side of the 7th lens Surface has a point of inflexion, and the distance value of this point of inflexion a to optical axis is h14, and the half of the 7th lens Footpath is H14, then 0.5≤│ h14/H14 │ and/or │ h14/H14 │≤0.8.

8. the optical lens as described in claim 1 or 2, it is characterised in that the picture of the 7th lens Side surface has a point of inflexion, and this surface, image side projects to this optical axis to this point of inflexion with the intersection point of an optical axis One development length of position is δ 7, │ δ 7/D7 │≤0.4, and D7 is that the 7th lens are on this optical axis Thickness, or D7 is the thickness of a central point of the 7th lens.

9. optical lens as claimed in claim 1 or 2, it is characterised in that these second lens have negative Diopter, the 3rd lens have positive diopter, and the 5th lens have negative diopter, the 6th lens tool Having positive diopter, the 7th lens have negative diopter.

10. optical lens as claimed in claim 1 or 2, it is characterised in that these second lens just have Diopter, the 3rd lens have negative diopter, and the 5th lens have positive diopter, the 6th lens tool Negative diopter, the 7th lens is had to have negative diopter.

11. optical lens as claimed in claim 1 or 2, it is characterised in that these first lens are one convex Concavees lens, a biconcave lens or a planoconcave lens, these second lens are a convexoconcave lens or a biconvex lens, 3rd lens are a biconvex lens or a convexoconcave lens, and the 4th lens are biconvex lens, and the 5th is saturating Mirror is a biconcave lens or a biconvex lens, and the 6th lens are a biconvex lens or a convexoconcave lens, or 7th lens are a biconcave lens or a convexoconcave lens.