TWI775657B - Optical imaging lens, imaging device, and electronic device - Google Patents

Abstract

An optical imaging lens includes, from an object side to an image side, a first lens having negative refractive power and including an object-side surface being convex and an image-side surface being concave, a second lens having negative refractive power and including an image-side surface being concave, a third lens having positive refractive power and including an object-side surface being convex and an image-side surface being convex, an aperture, a fourth lens having positive refractive power and including an image-side surface being convex, a fifth lens having positive refractive power and including an object-side surface being convex and an image-side surface being convex, and a sixth lens having negative refractive power and including an object-side surface being concave and an image-side surface being convex. The optical imaging lens includes a total of six elements. When specific conditions are satisfied, the optical imaging lens could have a compact size, wide angle of view and good imaging qualities.

Description

Optical image capturing lens set, imaging device and electronic device

The present invention relates to an optical image capturing lens group and an imaging device, in particular to an optical image capturing lens group, an imaging device and an electronic device suitable for a vehicle photographic electronic device or a surveillance camera system.

With the continuous improvement of semiconductor process technology, the pixel size of the image sensor element can reach a smaller size, and the performance is significantly improved. Therefore, an optical lens with high imaging quality has become an indispensable part of electronic camera devices.

With the diversified development of electronic camera devices, their application scope is more and more extensive, such as advanced driver assistance systems (ADAS), driving recorders, home surveillance camera equipment, smart phones and human-computer interaction devices, etc. The design of optical lenses Requirements are also more diverse. As far as vehicle photography devices are concerned, in order to clearly identify obstacles around the vehicle or oncoming vehicles on both sides, it is necessary to improve the resolution and brightness of the optical lens, and at the same time, it is required to have a high degree of adaptability to the ambient temperature. In addition, in order to correct various aberrations well, especially in the application of distance measurement or object recognition, if there is a large distortion aberration in the captured image, errors will easily occur in distance calculation or image recognition.

Therefore, how to design an optical imaging device to achieve a balance among miniaturization, high resolution and good optical imaging quality has become the goal of those skilled in the art.

Therefore, in order to solve the above problems, the present invention provides an optical image capturing lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens and sixth lens. The first lens has negative refractive power, and its object side is convex and its image side is concave; the second lens has negative refractive power, and its image side is concave; the third lens has positive refractive power, and its object side is convex and its image side is concave. The side is convex; the fourth lens has positive refractive power, and its image side is convex; the fifth lens has positive refractive power, and its object side is convex and its image side is convex; the sixth lens has negative refractive power, and its object side is concave The image side is convex; the fifth lens and the sixth lens form a cemented lens; the total number of lenses in the optical image capturing lens group is six. The radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the second lens is R4, the radius of curvature of the object side of the third lens is R5, and the effective focal length of the optical image capturing lens group is EFL, which is The following relations are satisfied: 2<R1/EFL<7; and 6<R5/R4<20.

According to an embodiment of the present invention, the focal length of the fifth lens is f5, the dispersion coefficient is Vd5, the focal length of the sixth lens is f6, the dispersion coefficient is Vd6, and the combined focal length of the fifth lens and the sixth lens is f56, which is The following relational expression is satisfied: 2<(f5*Vd5+f6*Vd6)/f56<7.

According to an embodiment of the present invention, the dispersion coefficient of the first lens is Vd1, the dispersion coefficient of the second lens is Vd2, and the dispersion coefficient of the third lens is Vd3, which satisfy the following relationship: Vd1-Vd2+Vd3<20.

According to an embodiment of the present invention, the thickness of the first lens on the optical axis is CT1, and the thickness of the third lens on the optical axis is CT3, which satisfy the following relationship: 5<CT3/CT1<13.

The present invention further provides an optical image capturing lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side. The first lens has negative refractive power, and its object side is convex and its image side is concave; the second lens has negative refractive power, and its image side is concave; the third lens has positive refractive power, and its object side is convex and its image side is concave. The side is convex; the fourth lens has positive refractive power, and its image side is convex; the fifth lens has positive refractive power, and its object side is convex and its image side is convex; the sixth lens has negative refractive power, and its object side is concave The image side is convex; the fifth lens and the sixth lens form a cemented lens; the total number of lenses in the optical image capturing lens group is six. Among them, the focal length of the fourth lens is f4, the combined focal length of the fifth lens and the sixth lens is f56, and as shown in FIGS. 7A and 7B , the maximum effective optical radius of the object side of the fourth lens 4 is RH41, and the sixth lens 6 The maximum effective optical radius of the image side surface is RH62, which satisfies the following relationship: f4>f56; and 0.4<RH41/RH62<0.8.

According to an embodiment of the present invention, the focal length of the third lens is f3, and the effective focal length of the entire optical image capturing lens group is EFL, which satisfies the following relationship: 3<f3/EFL<6.

According to an embodiment of the present invention, the focal length of the fourth lens is f4, and the effective focal length of the entire optical image capturing lens group is EFL, which satisfies the following relationship: 3<f4/EFL<6.

According to an embodiment of the present invention, the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following relationship: 0.6<f2/f1<1.3.

According to an embodiment of the present invention, the focal length of the first lens is f1, and the focal length of the sixth lens is f6, which satisfy the following relationship: 0.6<f1/f6<1.2.

According to an embodiment of the present invention, the combined focal length of the fifth lens and the sixth lens is f56, and the effective focal length of the overall optical image capturing lens group is EFL, which satisfies the following relationship: 2.5<f56/EFL<5.

According to an embodiment of the present invention, the curvature radius of the object side surface of the third lens is R5, and the curvature radius of the image side surface is R6, which satisfy the following relationship: -0.7<(R5+R6)/(R6-R5)< 0.2.

According to an embodiment of the present invention, the curvature radius of the object side surface of the sixth lens is R11, and the effective focal length of the overall optical image capturing lens group is EFL, which satisfies the following relationship: -1.6<R11/EFL<-0.8.

According to an embodiment of the present invention, the refractive index of the first lens is Nd1, the refractive index of the third lens is Nd3, and the refractive index of the sixth lens is Nd6, which satisfy the following relationship: Nd1>1.75; Nd3>1.75 ; and Nd6 > 1.75.

According to an embodiment of the present invention, the distance between the image side of the second lens and the object side of the third lens on the optical axis is AT23, and the focal length of the third lens is f3, which satisfies the following relationship: 4<f3/ AT23<13.

According to an embodiment of the present invention, the distance on the optical axis between the image side of the sixth lens and the imaging surface of the optical image capturing lens group is BFL, and the object side of the first lens and the optical image capturing lens group The distance between the imaging planes on the optical axis is TTL, which satisfies the following relationship: 3<TTL/BFL<5.

The present invention further provides an imaging device comprising the aforementioned optical image capturing lens group, and an image sensing element, wherein the image sensing element is disposed on the imaging surface of the optical image capturing lens group.

The present invention further provides an electronic device comprising the above-mentioned imaging device.

In the following embodiments, the optical image capturing lens group includes a plurality of lenses, and the material of each lens can be glass or plastic, and is not limited to the materials listed in the embodiments. When the lens material is glass, the surface of the lens can be processed by grinding or molding, and due to the temperature resistance and high hardness of the glass material itself, the impact of environmental changes on the optical image capturing lens group can be reduced, thereby extending the optical image. Capture the service life of the lens group. When the lens material is plastic, it is beneficial to reduce the weight of the optical image capturing lens group and reduce the production cost.

In the embodiment of the present invention, each lens includes an object side facing the subject, and an image side facing the imaging surface. The surface shape of each lens is defined according to the shape of the surface near the optical axis (paraxial region). For example, when describing a lens as having a convex object side, it means that the object side of the lens is convex near the optical axis. , that is, although the lens surface is described as convex in the embodiments, the surface may be convex or concave in the region away from the optical axis (off-axis). The shape at the paraxial position of each lens is judged by whether the radius of curvature of the surface is positive or negative. For example, if the radius of curvature of the side of a lens is positive, the side of the object is convex; If the radius of curvature is negative, the sides of the object are concave. As far as the image side of a lens is concerned, if its curvature radius is positive, the image side is concave; on the contrary, if its curvature radius is negative, the image side is convex.

In embodiments of the present invention, the object side and the image side of each lens may be spherical or aspherical surfaces. Using an aspheric surface on the lens helps to correct imaging aberrations of the optical image capture lens group such as spherical aberration, and reduces the number of optical lens elements used. However, the use of aspherical lenses increases the cost of the overall optical image capture lens assembly. Although in the embodiments of the present invention, the surfaces of some optical lenses use spherical surfaces, they can still be designed as aspherical surfaces as needed; Design it as a spherical surface.

In the embodiment of the present invention, the total track length TTL (Total Track Length) of the optical image capturing lens group is defined as the distance on the optical axis from the object side of the first lens of the optical image capturing lens group to the imaging plane. The imaging height of the optical image capture lens group is called the maximum image height ImgH (Image Height); when an image sensing element is set on the imaging surface, the maximum image height ImgH represents the effective sensing area diagonal of the image sensing element half the length. Both the object side or the image side of an optical lens have a maximum optical effective radius, which is defined as the intersection point of the maximum viewing angle ray and the lens surface when the light is transmitted to any lens surface, and the intersection point and the optical image capture The vertical distance between the optical axes of the lens group is defined as the maximum optical effective radius (Ray Heigh, RH) of the lens surface. In the following examples, the units of curvature radius, lens thickness, distance between lenses, total lens length TTL, maximum image height ImgH, maximum optical effective radius RH, and focal length (Focal Length) of all lenses are in millimeters ( mm) are indicated.

The present invention provides an optical image capturing lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side. The first lens has negative refractive power, and its object side is convex and its image side is concave; the second lens has negative refractive power, and its image side is concave; the third lens has positive refractive power, and its object side is convex and its image side is concave. The side is convex; the fourth lens has positive refractive power, and its image side is convex; the fifth lens has positive refractive power, and its object side is convex, and its image side is convex; and the sixth lens has negative refractive power, and its object side is The concave surface and the image side surface are convex surfaces; wherein, the fifth lens and the sixth lens form a cemented lens; the number of lens groups of the optical image capturing lens group is six.

The first lens has a negative refractive power, the object side is convex, and the image side is concave, which helps to expand the viewing angle and improve the light-receiving range of the optical image capturing lens group. The second lens also has negative refractive power, so that the negative refractive power at the front end of the optical image capturing lens group can be properly distributed to the first lens and the second lens. The image side of the second lens is concave, which is helpful for correcting the first lens. Aberrations produced by the lens.

The third lens has positive refractive power and is used for converging light. The third lens is adjacent to the first lens and the second lens with negative refractive power, which helps to control the overall size of the lens group.

The fourth lens has a positive refractive power, and it and the third lens with the same positive refractive power are respectively arranged on both sides of the aperture to serve as a component for adjusting the optical path; aberrations.

The fifth lens has positive refractive power, the object side is convex, and the image side is convex, and the sixth lens has negative refractive power, and its object side is concave and the image side is convex. The fifth lens and the sixth lens are bonded to each other to form a cemented lens, which is beneficial to correct the chromatic aberration of the optical image capturing lens group.

The radius of curvature of the object side of the first lens of the optical image capturing lens group is R1, the radius of curvature of the image side of the second lens is R4, and the radius of curvature of the object side of the third lens is R5. The effective focal length of is EFL, which satisfies the following relationship:

2<R1/EFL<7; (1) and

6＜R5/R4＜20; (2)

By satisfying the condition of the relational expression (1), an optical image capturing lens group with a wide viewing angle can be formed, and satisfying the condition of the relational expression (2) helps to control the shape of the image side of the second lens and the object side of the third lens. , to correct field curvature aberration.

The focal length of the fifth lens of the optical image capturing lens group is f5, the focal length of the sixth lens is f6, the combined focal length of the fifth lens and the sixth lens is f56, the dispersion coefficient of the fifth lens is Vd5, the sixth lens The dispersion coefficient of the lens is Vd6, which satisfies the following relationship:

2<(f5*Vd5+f6*Vd6)/f56<7; (3)

By satisfying the condition of the relational expression (3), it is helpful to select the fifth lens and the sixth lens with different refractive index and dispersion characteristics, so as to correct the chromatic aberration of the optical image capturing lens group.

The dispersion coefficient of the first lens of the optical image capturing lens group is Vd1, the dispersion coefficient of the second lens is Vd2, and the dispersion coefficient of the third lens is Vd3, which satisfy the following relationship:

Vd1-Vd2+Vd3＜20; (4)

By satisfying the conditions of the relational expression (4), the first lens and the second lens material can have lower dispersion characteristics, and the dispersion characteristics of the third lens and the first lens and the second lens complement each other, which is beneficial to reduce the dispersion. Chromatic aberrations of optical image capture lens assemblies.

The thickness of the first lens on the optical axis of the optical image capturing lens group is CT1, and the thickness of the third lens on the optical axis is CT3, which satisfies the following relationship:

5＜CT3/CT1＜13; (5)

By satisfying the condition of the relational expression (5), the thickness of the first lens and the third lens on the optical axis can be maintained at an appropriate ratio.

The focal length of the fourth lens of the optical image capturing lens group is f4, and the combined focal length of the fifth lens and the sixth lens is f56. Referring to FIG. 7A , the maximum effective optical radius of the object side of the fourth lens 4 is RH41; referring to FIG. 7B , the maximum effective optical radius of the image side of the sixth lens 6 is RH62. The optical image capturing lens set satisfies the following relationship:

f4>f56; (6) and

0.4＜RH41/RH62＜0.8; (7)

By satisfying the conditions of relational expressions (6) and (7), it is helpful to control the size of the three lenses behind the aperture, and to make the optical image capturing lens group form an appropriate image height.

The focal length of the third lens of the optical image capturing lens group is f3, and the effective focal length of the optical image capturing lens group is EFL, which satisfies the following relationship:

3<f3/EFL<6; (8)

By satisfying the condition of the relational expression (8), it is helpful to maintain an appropriate ratio between the focal length of the third lens and the effective focal length of the overall optical image capturing lens group.

The focal length of the fourth lens of the optical image capturing lens group is f4, and the effective focal length of the optical image capturing lens group is EFL, which satisfies the following relationship:

3<f4/EFL<6; (9)

By satisfying the condition of the relational expression (9), it is helpful to maintain an appropriate ratio between the focal length of the fourth lens and the effective focal length of the overall optical image capturing lens group.

The focal length of the first lens of the optical image capturing lens group is f1, and the focal length of the second lens is f2, which satisfy the following relationship:

0.6 < f2/f1 < 1.3; (10)

By satisfying the condition of the relational expression (10), it is helpful to properly distribute the negative refractive power of the front end of the optical image capturing lens group to the first lens and the second lens.

The focal length of the first lens of the optical image capturing lens group is f1, and the focal length of the sixth lens is f6, which satisfy the following relationship:

0.6 < f1/f6 < 1.2; (11)

By satisfying the condition of the relational expression (11), it is helpful to control the focal length of the first lens and the focal length of the sixth lens to maintain an appropriate ratio.

The combined focal length of the fifth lens and the sixth lens of the optical image capturing lens group is f56, and the effective focal length of the optical image capturing lens group is EFL, which satisfies the following relationship:

2.5<f56/EFL<5; (12)

Satisfying the condition of the relational expression (12) helps to maintain a proper ratio between the combined focal length f56 of the fifth lens element and the sixth lens element and the effective focal length of the entire optical image capturing lens group.

The curvature radius of the object side surface of the third lens of the optical image capturing lens group is R5, and the curvature radius of the image side surface is R6, which satisfy the following relationship:

-0.7＜(R5+R6)/(R6-R5)＜0.2; (13)

By satisfying the condition of the relational expression (13), the shapes of the object side surface and the image side surface of the third lens can be controlled, which is beneficial to correct the imaging aberration.

The curvature radius of the object side surface of the sixth lens of the optical image capturing lens group is R11, and the effective focal length of the optical image capturing lens group is EFL, which satisfies the following relationship:

-1.6＜R11/EFL＜-0.8; (14)

By satisfying the condition of the relational expression (14), the cemented surface of the fifth lens element and the sixth lens element can be controlled to have an appropriate radius of curvature, which is helpful for correcting field curvature aberration and chromatic aberration.

The refractive index of the first lens of the optical image capturing lens group is Nd1, the refractive index of the third lens is Nd3, and the refractive index of the sixth lens is Nd6, which satisfy the following relationship:

Nd1>1.75; Nd3>1.75; and Nd6>1.75; (15)

By satisfying the condition of relational expression (15), the optical image capturing lens group can have at least three optical lenses with high refractive index, which can effectively reduce imaging aberrations and reduce the number of aspherical lenses used.

The distance between the image side of the second lens and the object side of the third lens on the optical axis of the optical image capturing lens group is AT23, and the focal length of the third lens is f3, which satisfies the following relationship:

4<f3/AT23<13; (16)

By satisfying the condition of the relational expression (16), it is helpful to control the distance between the second lens and the third lens.

The distance from the image side of the sixth lens of the optical image capturing lens group to the imaging surface on the optical axis is the back focal length BFL, and the object side of the first lens to the imaging surface of the optical image capturing lens group is on the optical axis The distance is TTL, which satisfies the following relation:

3<TTL/BFL<5; (17)

By satisfying the condition of the relational expression (17), the optical image capturing lens group can be made to have an appropriate rear focal length, which is beneficial to improve the imaging quality. first embodiment

Referring to FIG. 1A and FIG. 1B , FIG. 1A is a schematic diagram of an optical image capturing lens assembly according to a first embodiment of the present invention. FIG. 1B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatic field curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 1A , the optical image capturing lens group 10 of the first embodiment includes a first lens 11 , a second lens 12 , a third lens 13 , an aperture ST, a fourth lens 14 , a first lens 11 , a second lens 12 , a third lens 13 , an aperture ST, a fourth lens 14 , Fifth lens 15 and sixth lens 16 . The optical image capturing lens set 10 can further include a filter element 17 , a protective glass 18 and an imaging surface 19 . An image sensing element 100 can be further disposed on the imaging surface 19 to form an imaging device (not marked).

The first lens 11 has a negative refractive power, the object side 11a is convex, the image side 11b is concave, and both the object side 11a and the image side 11b are spherical. The material of the first lens 11 is glass.

The second lens 12 has a negative refractive power, the object side 12a is convex, the image side 12b is concave, and both the object side 12a and the image side 12b are aspherical. The material of the second lens 12 is plastic.

The third lens 13 has a positive refractive power, the object side 13a is convex, the image side 13b is convex, and both the object side 13a and the image side 13b are spherical. The material of the third lens 13 is glass.

The fourth lens 14 has a positive refractive power, the object side 14a is convex, the image side 14b is convex, and both the object side 14a and the image side 14b are aspherical. The material of the fourth lens 14 is plastic.

The fifth lens 15 has a positive refractive power, the object side 15a is convex, the image side 15b is convex, and both the object side 15a and the image side 15b are spherical. The material of the fifth lens 15 is glass.

The sixth lens 16 has a negative refractive power, the object side 16a is concave, the image side 16b is convex, and both the object side 16a and the image side 16b are spherical. The material of the sixth lens 16 is glass. The image side surface 15b of the fifth lens 15 and the object side surface 16a of the sixth lens 16 have the same curvature radius and are bonded to each other to form a cemented lens.

The filter element 17 is disposed between the sixth lens 16 and the imaging surface 19 for filtering out light in a specific wavelength range, for example, an infrared filter element (IR Filter). The two surfaces 17a and 17b of the filter element 17 are both flat surfaces, and the material is glass.

The protective glass 18 is disposed on the image sensing element 100 , the two surfaces 18 a and 18 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 100 is, for example, a charge-coupled device (CCD) Image Sensor or a CMOS Image Sensor.

The curve equations of the above aspheric surfaces are expressed as follows:

Among them, X: the distance between the point on the aspheric surface whose distance from the optical axis is Y and the tangent plane of the aspheric surface on the optical axis;

Y: the vertical distance between the point on the aspheric surface and the optical axis;

R: the radius of curvature of the lens at the near optical axis;

K: cone factor; and

Ai: i-th order aspheric coefficient.

Please refer to Table 1 below, which is the detailed optical data of the optical image capturing lens set 10 according to the first embodiment of the present invention. Wherein, the object side 11a of the first lens 11 is marked as the surface 11a, the image side 11b is marked as the surface 11b, and so on for other lens surfaces. The value in the distance column in the table represents the distance from the surface to the next surface on the optical axis I. For example, the distance from the object side 11a of the first lens 11 to the image side 11b is 0.5 mm, which means that the first lens 11 is on the optical axis. The thickness is 0.5 mm. The distance from the image side 11b of the first lens 11 to the object side 12a of the second lens 12 is 3.002 mm. Others can be deduced by analogy, and will not be repeated below.

In the first embodiment, the effective focal length of the optical image capturing lens group 10 is EFL, the aperture value (F-number) is Fno, and half of the maximum angle of view of the entire optical image capturing lens group 10 is HFOV (Half Field of View). The distance from the object side surface 11a of the first lens 11 to the imaging surface 11 on the optical axis I is the total length TTL. On the imaging surface 11, one half of the diagonal line of the effective sensing area of the image sensing element 100 is the maximum image height ImgH, and its value is As follows: EFL= 2.61 mm, Fno= 2.63, TTL= 23.45 mm, HFOV= 70 degrees, ImgH= 3.354 mm. The tables of the following embodiments correspond to the optical image capturing lens sets of the respective embodiments, and the definitions of the tables are the same as those of the present embodiment, so they will not be repeated in the following embodiments. first embodiment EFL = 2.61 mm, Fno = 2.63, HFOV = 70 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject unlimited unlimited first lens 11a spherical 10.427 0.500 1.806 46.8 -7.20 Glass 11b spherical 3.633 3.002 second lens 12a Aspherical 7.636 0.643 1.539 55.9 -8.42 plastic 12b Aspherical 2.755 1.471 third lens 13a spherical 36.032 4.500 1.933 18.9 12.35 Glass 13b spherical -15.548 0.352 aperture ST flat unlimited 1.238 fourth lens 14a Aspherical 1362.175 1.042 1.533 55.8 11.41 plastic 14b Aspherical -6.076 0.506 Fifth lens 15a spherical 31.430 2.634 1.776 49.6 4.02 Glass 15b (glue side) spherical -3.338 0.000 sixth lens 16a (glue side) spherical -3.338 1.101 1.957 17.9 -7.67 Glass 16b spherical -7.113 5.000 filter element 17a flat unlimited 0.210 1.517 64.2 Glass 17b flat unlimited 0.500 protective glass 18a flat unlimited 0.400 1.517 64.2 Glass 18b flat unlimited 0.348 Imaging plane 19 flat unlimited Reference wavelength: 550 nm Table I

Please refer to Table 2 below, which are the aspheric coefficients of the surfaces of the second lens and the fourth lens according to the first embodiment of the present invention. Among them, K is the cone coefficient in the aspheric curve equation, and A ₂ to A ₁₂ represent the 2nd to 12th order aspheric coefficients of each surface. For example, the taper coefficient K of the object side surface 12a of the second lens 12 is 1.99. Others can be deduced by analogy, and will not be repeated below. In addition, the tables of the following embodiments correspond to the optical image capturing lens sets of the respective embodiments, and the definitions of the tables are the same as those of the present embodiment, so they will not be repeated in the following embodiments. Aspheric coefficients of the first embodiment surface 12a 12b 14a 14b K 1.99E+00 -4.73E-01 2.17E+05 -1.04E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.26E-03 5.64E-03 3.19E-03 2.84E-03 A ₆ -3.06E-04 3.47E-05 5.79E-04 4.13E-04 A ₈ 1.45E-05 -3.05E-05 -1.20E-05 2.15E-05 A ₁₀ -2.89E-07 5.21E-06 3.88E-07 1.83E-06 A ₁₂ 1.55E-10 -9.25E-08 8.79E-08 6.27E-09 Table II

In the first embodiment, the relationship between the curvature radius R1 of the object side surface 11a of the first lens 11 and the effective focal length EFL of the overall optical image capturing lens group 10 is R1/EFL=4.0.

In the first embodiment, the relationship between the radius of curvature R5 of the object side surface 13a of the third lens 13 and the radius of curvature R4 of the image side surface 12b of the second lens 12 is R5/R4=13.08.

In the first embodiment, the relationship between the focal length f5 and dispersion coefficient Vd5 of the fifth lens 15, the focal length f6 and dispersion coefficient Vd6 of the sixth lens 15, and the combined focal length f56 of the fifth lens 15 and the sixth lens 16 The formula is (f5*Vd5+f6*Vd6)/f56= 6.5.

In the first embodiment, the relationship between the dispersion coefficient Vd1 of the first lens 11, the dispersion coefficient Vd2 of the second lens 12, and the dispersion coefficient Vd3 of the third lens 13 is Vd1-Vd2+Vd3=9.77.

In the first embodiment, the relationship between the lens thickness CT3 of the third lens 13 on the optical axis and the lens thickness CT1 of the first lens 11 on the optical axis I is CT3/CT1=9.0.

In the first embodiment, the focal length f4 of the fourth lens 14 is 11.41, and the combined focal length f56 of the fifth lens 15 and the sixth lens 16 is 9.54, which satisfies the condition of the relation f4>f56.

In the first embodiment, the relationship between the maximum optical effective radius RH41 of the object side 14a of the fourth lens 14 and the maximum optical effective radius RH62 of the image side 16b of the sixth lens 16 is RH41/RH62=0.66.

In the first embodiment, the relationship between the focal length f3 of the third lens 13 and the effective focal length EFL of the overall optical image capturing lens group 10 is f3/EFL=4.74.

In the first embodiment, the relationship between the focal length f4 of the fourth lens element 14 and the effective focal length EFL of the overall optical image capturing lens group 10 is f4/EFL=4.38.

In the first embodiment, the relationship between the focal length f2 of the second lens 12 and the focal length f1 of the first lens 11 is f2/f1=1.17.

In the first embodiment, the relationship between the focal length f1 of the first lens 11 and the focal length f6 of the sixth lens 16 is f1/f6=0.94.

In the first embodiment, the relationship between the combined focal length f56 of the fifth lens element 15 and the sixth lens element 16 and the effective focal length EFL of the overall optical image capturing lens group 10 is f56/EFL=3.66.

In the first embodiment, the relationship between the curvature radius R5 of the object side surface 13a of the third lens 13 and the curvature radius R6 of the image side surface 13b is (R5+R6)/(R6-R5)=-0.36.

In the first embodiment, the relationship between the curvature radius R11 of the object side surface 16a of the sixth lens 16 and the effective focal length EFL of the overall optical image capturing lens group 10 is R11/EFL=-1.28.

In the first embodiment, the refractive index Nd1 of the first lens 11 , the refractive index Nd3 of the third lens 13 and the refractive index Nd6 of the sixth lens 16 are respectively Nd1=1.806, Nd3=1.933 and Nd6=1.957.

In the first embodiment, the relationship between the focal length f3 of the third lens 13 and the distance AT23 between the image side 12b of the second lens 12 and the object side 13a of the third lens 13 on the optical axis I is f3/AT23=8.40 .

In the first embodiment, the distance TTL from the object side 11a of the first lens 11 of the optical image capturing lens group 10 to the imaging plane 19 on the optical axis I is TTL, and the distance TTL from the image side 16b to the imaging plane 19 of the sixth lens 16 is in the optical axis. The distance BFL on the axis I, the relationship between the two is TTL/BFL=3.63.

From the numerical values of the above relational expressions, it can be known that the optical image capturing lens assembly 10 of the first embodiment satisfies the requirements of relational expressions (1) to (17).

Referring to FIG. 1B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical image capturing lens group 10 , respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.04mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.01mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 1B , the optical image capturing lens assembly 10 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Second Embodiment

Referring to FIG. 2A and FIG. 2B , FIG. 2A is a schematic diagram of an optical image capturing lens group according to a second embodiment of the present invention. FIG. 2B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the second embodiment of the present invention in order from left to right.

As shown in FIG. 2A , the optical image capturing lens group 20 of the second embodiment includes a first lens 21 , a second lens 22 , a third lens 23 , an aperture ST, a fourth lens 24 , a first lens 21 , a second lens 22 , a third lens 23 , an aperture ST, a fourth lens 24 , Fifth lens 25 and sixth lens 26 . The optical image capturing lens group 20 can further include a filter element 27 , a protective glass 28 and an imaging surface 29 . An image sensing element 200 can be further disposed on the imaging surface 29 to form an imaging device (not marked).

The first lens 21 has a negative refractive power, the object side 21a is convex, the image side 21b is concave, and both the object side 21a and the image side 21b are spherical. The material of the first lens 21 is glass.

The second lens 22 has a negative refractive power, the object side 22a is convex, the image side 22b is concave, and both the object side 22a and the image side 22b are aspherical. The material of the second lens 22 is plastic.

The third lens 23 has a positive refractive power, the object side 23a is convex, the image side 23b is convex, and both the object side 23a and the image side 23b are spherical. The material of the third lens 23 is glass.

The fourth lens 24 has a positive refractive power, the object side 24a is convex, the image side 24b is convex, and both the object side 24a and the image side 24b are aspherical. The material of the fourth lens 24 is plastic.

The fifth lens 25 has a positive refractive power, the object side 25a is convex, the image side 25b is convex, and both the object side 25a and the image side 25b are spherical. The material of the fifth lens 25 is glass.

The sixth lens 26 has a negative refractive power, the object side 26a is concave, the image side 26b is convex, and both the object side 26a and the image side 26b are spherical. The material of the sixth lens 26 is glass. The image side surface 25b of the fifth lens 25 and the object side surface 26a of the sixth lens 26 have the same curvature radius, and are bonded to each other to form a cemented lens.

The filter element 27 is disposed between the sixth lens 26 and the imaging surface 29 for filtering out light in a specific wavelength range, for example, an infrared filter element (IR Filter). The two surfaces 27a and 27b of the filter element 27 are both flat surfaces, and the material is glass.

The protective glass 28 is disposed on the image sensing element 200 , the two surfaces 28 a and 28 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 200 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical image capturing lens group 20 of the second embodiment are listed in Tables 3 and 4, respectively. In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Second Embodiment EFL = 2.43 mm, Fno = 2.54, HFOV = 70 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject unlimited unlimited first lens 21a spherical 13.013 0.400 1.808 46.5 -7.05 Glass 21b spherical 3.888 3.276 second lens 22a Aspherical 8.093 0.600 1.527 56.3 -8.01 plastic 22b Aspherical 2.693 1.607 third lens 23a spherical 48.407 4.154 1.932 20.9 13.29 Glass 23b spherical -15.641 0.041 aperture ST flat unlimited 1.687 fourth lens 24a Aspherical 3747.083 1.257 1.539 55.9 10.69 plastic 24b Aspherical -5.740 0.100 Fifth lens 25a spherical 39.429 3.565 1.777 49.6 4.18 Glass 25b (glue side) spherical -3.399 0.000 sixth lens 26a (glue side) spherical -3.399 2.008 1.957 17.9 -9.63 Glass 26b spherical -6.941 1.387 filter element 27a flat unlimited 0.210 1.517 64.2 Glass 27b flat unlimited 3.796 protective glass 28a flat unlimited 0.400 1.517 64.2 Glass 28b flat unlimited 0.519 Imaging plane 29 flat unlimited Reference wavelength: 550 nm Table 3 Aspheric coefficients of the second embodiment surface 22a 22b 24a 24b K 1.97E+00 -4.82E-01 6.19E+05 -1.08E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.27E-03 5.50E-03 3.18E-03 2.87E-03 A ₆ -3.10E-04 4.17E-05 5.79E-04 4.11E-04 A ₈ 1.40E-05 -3.05E-05 -1.21E-05 2.02E-05 A ₁₀ -3.20E-07 5.26E-06 1.77E-07 1.57E-06 A ₁₂ 9.98E-10 -1.62E-08 1.75E-08 -4.99E-09 Table 4

The numerical values of the relational expressions of the optical image capturing lens group 20 of the second embodiment are listed in Table 5. It can be seen from Table 5 that the optical image capturing lens group 20 of the second embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value R1/EFL 5.38 R5/R4 17.98 (f5*Vd5+f6*Vd6)/f56 3.66 Vd1-Vd2+Vd3 11.10 CT3/CT1 10.39 f4 10.69 f56 9.42 RH41/RH62 0.66 f3/EFL 5.49 f4/EFL 4.42 f2/f1 1.14 f1/f6 0.73 f56/EFL 3.90 (R5+R6)/(R6-R5) -0.34 R11/EFL -1.41 Nd1 1.808 Nd3 1.932 Nd6 1.957 f3/AT23 8.27 TTL/BFL 3.96 Table 5

Referring to FIG. 2B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical image capturing lens group 20 , respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.02mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within + 0.02mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.01mm; and the distortion aberration can be controlled within 2%. As shown in FIG. 2B , the optical image capturing lens group 20 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Third Embodiment

Referring to FIG. 3A and FIG. 3B , FIG. 3A is a schematic diagram of an optical image capturing lens group according to a third embodiment of the present invention. FIG. 3B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the third embodiment of the present invention in order from left to right.

As shown in FIG. 3A , the optical image capturing lens group 30 of the third embodiment includes a first lens 31 , a second lens 32 , a third lens 33 , an aperture ST, a fourth lens 34 , Fifth lens 35 and sixth lens 36 . The optical image capturing lens group 30 may further include a filter element 37 , a protective glass 38 and an imaging surface 39 . An image sensing element 300 can be further disposed on the imaging surface 39 to form an imaging device (not marked).

The first lens 31 has a negative refractive power, the object side 31a is convex, the image side 31b is concave, and both the object side 31a and the image side 31b are spherical. The material of the first lens 31 is glass.

The second lens 32 has a negative refractive power, the object side 32a is convex, the image side 32b is concave, and both the object side 32a and the image side 32b are aspherical. The material of the second lens 32 is plastic.

The third lens 33 has a positive refractive power, the object side 33a is convex, the image side 33b is convex, and both the object side 33a and the image side 33b are spherical. The material of the third lens 33 is glass.

The fourth lens 34 has positive refractive power, the object side surface 34a is flat, the image side surface 34b is convex, and both the object side surface 34a and the image side surface 34b are aspherical. The material of the fourth lens 34 is plastic.

The fifth lens 35 has a positive refractive power, the object side 35a is convex, the image side 35b is convex, and both the object side 35a and the image side 35b are spherical. The material of the fifth lens 35 is glass.

The sixth lens 36 has negative refractive power, the object side 36a is concave, the image side 36b is convex, and both the object side 36a and the image side 36b are spherical. The material of the sixth lens 36 is glass. The image side surface 35b of the fifth lens 35 and the object side surface 36a of the sixth lens 36 have the same curvature radius, and are bonded to each other to form a cemented lens.

The filter element 37 is disposed between the sixth lens 36 and the imaging surface 39 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 37a and 37b of the filter element 37 are both flat surfaces, and the material is glass.

The protective glass 38 is disposed on the image sensing element 300 , the two surfaces 38 a and 38 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 300 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical image capturing lens group 30 of the third embodiment are listed in Table 6 and Table 7, respectively. In the third embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. Third Embodiment EFL= 2.68 mm, Fno = 2.50, HFOV = 70 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject unlimited unlimited first lens 31a spherical 12.000 0.400 1.806 46.8 -6.88 Glass 31b spherical 3.721 2.066 second lens 32a Aspherical 11.417 0.265 1.541 56.1 -8.22 plastic 32b Aspherical 3.160 1.172 third lens 33a spherical 22.276 2.778 1.933 18.9 13.65 Glass 33b spherical -26.929 2.100 aperture ST flat unlimited 0.500 fourth lens 34a Aspherical unlimited 1.300 1.541 56.1 12.13 plastic 34b Aspherical -6.522 0.504 Fifth lens 35a spherical 18.345 2.764 1.777 49.6 4.00 Glass 35b (glued side) spherical -3.501 0.000 sixth lens 36a (glued side) spherical -3.501 0.834 1.957 17.9 -9.15 Glass 36b spherical -6.516 1.345 filter element 37a flat unlimited 0.210 1.517 64.2 Glass 37b flat unlimited 3.989 protective glass 38a flat unlimited 0.400 1.517 64.2 Glass 38b flat unlimited 0.452 Imaging plane 39 flat unlimited Reference wavelength: 550 nm Table 6 Aspheric coefficients of the third embodiment surface 32a 32b 34a 34b K 2.00E+00 -4.75E-01 1.02E+06 -1.17E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.28E-03 5.61E-03 3.18E-03 2.91E-03 A ₆ -3.07E-04 6.15E-05 5.75E-04 4.18E-04 A ₈ 1.44E-05 -2.85E-05 -1.55E-05 1.88E-05 A ₁₀ -2.93E-07 5.17E-06 -1.44E-06 1.23E-07 A ₁₂ -1.59E-09 -1.10E-07 -5.02E-07 -6.76E-07 Table 7

The numerical values of the relational expressions of the optical image capturing lens group 30 of the third embodiment are listed in Table 8. It can be seen from Table 8 that the optical image capturing lens group 30 of the third embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value R1/EFL 4.49 R5/R4 7.05 (f5*Vd5+f6*Vd6)/f56 4.56 Vd1-Vd2+Vd3 9.60 CT3/CT1 6.95 f4 12.13 f56 7.56 RH41/RH62 0.55 f3/EFL 5.11 f4/EFL 4.54 f2/f1 1.19 f1/f6 0.75 f56/EFL 2.83 (R5+R6)/(R6-R5) 0.09 R11/EFL -1.31 Nd1 1.806 Nd3 1.933 Nd6 1.957 f3/AT23 11.65 TTL/BFL 3.30 Table 8

Referring to FIG. 3B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical image capturing lens group 30 , respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within + 0.03mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.02mm; and the distortion aberration can be controlled within 4%. As shown in FIG. 3B , the optical image capturing lens group 30 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Fourth Embodiment

Referring to FIG. 4A and FIG. 4B , FIG. 4A is a schematic diagram of an optical image capturing lens group according to a fourth embodiment of the present invention. FIG. 4B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the fourth embodiment of the present invention in order from left to right.

As shown in FIG. 4A , the optical image capturing lens group 40 of the fourth embodiment sequentially includes a first lens 41 , a second lens 42 , a third lens 43 , an aperture ST, a fourth lens 44 , and a second lens 42 from the object side to the image side. Fifth lens 45 and sixth lens 46 . The optical image capturing lens group 40 may further include a filter element 47 , a protective glass 48 and an imaging surface 49 . An image sensing element 400 can be further disposed on the imaging surface 49 to form an imaging device (not marked).

The first lens 41 has negative refractive power, the object side 41a is convex, the image side 41b is concave, and both the object side 41a and the image side 41b are spherical. The material of the first lens 41 is glass.

The second lens 42 has a negative refractive power, the object side 42a is convex, the image side 42b is concave, and both the object side 42a and the image side 42b are aspherical. The material of the second lens 42 is plastic.

The third lens 43 has a positive refractive power, the object side 43a is convex, the image side 43b is convex, and both the object side 43a and the image side 43b are spherical. The material of the third lens 43 is glass.

The fourth lens 44 has a positive refractive power, the object side 44a is concave, the image side 44b is convex, and both the object side 44a and the image side 44b are aspherical. The material of the fourth lens 44 is plastic.

The fifth lens 45 has a positive refractive power, the object side 45a is convex, the image side 45b is convex, and both the object side 45a and the image side 45b are spherical. The material of the fifth lens 45 is glass.

The sixth lens 46 has negative refractive power, the object side 46a is concave, the image side 46b is convex, and both the object side 46a and the image side 46b are spherical. The material of the sixth lens 46 is glass. The image side surface 45b of the fifth lens 45 and the object side surface 46a of the sixth lens 46 have the same curvature radius, and are bonded to each other to form a cemented lens.

The filter element 47 is disposed between the sixth lens 46 and the imaging surface 49 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 47a and 47b of the filter element 47 are both flat surfaces, and the material is glass.

The protective glass 48 is disposed on the image sensing element 400 , the two surfaces 48 a and 48 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 400 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical image capturing lens group 40 of the fourth embodiment are listed in Table 9 and Table 10, respectively. In the fourth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Fourth Embodiment EFL = 3.15 mm, Fno = 2.70, HFOV = 70 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject unlimited unlimited first lens 41a spherical 8.809 0.791 1.820 46.6 -8.89 Glass 41b spherical 3.814 1.523 second lens 42a Aspherical 8.337 0.643 1.541 56.1 -7.81 plastic 42b Aspherical 2.717 1.515 third lens 43a spherical 32.286 4.657 1.933 18.9 11.97 Glass 43b spherical -15.507 0.759 aperture ST flat unlimited 1.060 fourth lens 44a Aspherical -833.650 1.179 1.533 56.3 11.16 plastic 44b Aspherical -5.877 0.100 Fifth lens 45a spherical 44.609 3.241 1.776 49.6 4.19 Glass 45b (glued side) spherical -3.394 0.000 sixth lens 46a (glued side) spherical -3.394 1.661 1.933 18.9 -8.68 Glass 46b spherical -7.223 1.428 filter element 47a flat unlimited 0.210 1.517 64.2 Glass 47b flat unlimited 3.944 protective glass 48a flat unlimited 0.400 1.517 64.2 Glass 48b flat unlimited 0.525 Imaging plane 49 flat unlimited Reference wavelength: 550 nm Table 9 Aspheric coefficients of the fourth embodiment surface 42a 42b 44a 44b K 2.16E+00 -4.56E-01 -2.09E+06 -1.17E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.15E-03 5.37E-03 3.21E-03 2.92E-03 A ₆ -3.03E-04 3.88E-05 5.85E-04 4.14E-04 A ₈ 1.44E-05 -3.15E-05 -1.23E-05 2.01E-05 A ₁₀ -3.07E-07 5.23E-06 9.10E-08 1.52E-06 A ₁₂ -1.77E-09 5.61E-08 -8.91E-09 -1.71E-08 Table 10

The numerical values of the relational expressions of the optical image capturing lens group 40 of the fourth embodiment are listed in Table 11. It can be seen from Table 11 that the optical image capturing lens group 40 of the fourth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value R1/EFL 2.80 R5/R4 11.88 (f5*Vd5+f6*Vd6)/f56 4.44 Vd1-Vd2+Vd3 9.45 CT3/CT1 5.89 f4 11.16 f56 9.89 RH41/RH62 0.59 f3/EFL 3.81 f4/EFL 3.55 f2/f1 0.88 f1/f6 1.02 f56/EFL 3.15 (R5+R6)/(R6-R5) -0.35 R11/EFL -1.08 Nd1 1.820 Nd3 1.933 Nd6 1.933 f3/AT23 7.90 TTL/BFL 3.63 Table 11

Referring to FIG. 4B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram, and the distortion aberration diagram of the optical image capturing lens group 40 , respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.04mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within + 0.05mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.02mm; and the distortion aberration can be controlled within 14%. As shown in FIG. 4B , the optical image capturing lens group 40 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Fifth Embodiment

Referring to FIG. 5A and FIG. 5B , FIG. 5A is a schematic diagram of an optical image capturing lens group according to a fifth embodiment of the present invention. 5B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the fifth embodiment of the present invention in order from left to right.

As shown in FIG. 5A , the optical image capturing lens group 50 of the fifth embodiment sequentially includes a first lens 51 , a second lens 52 , a third lens 53 , an aperture ST, a fourth lens 54 , and a second lens 52 from the object side to the image side. Fifth lens 55 and sixth lens 56 . The optical image capturing lens group 50 may further include a filter element 57 , a protective glass 58 and an imaging surface 59 . An image sensing element 500 can be further disposed on the imaging surface 59 to form an imaging device (not marked).

The first lens 51 has a negative refractive power, the object side 51a is convex, the image side 51b is concave, and both the object side 51a and the image side 51b are spherical. The material of the first lens 51 is glass.

The second lens 52 has a negative refractive power, the object side 52a is convex, the image side 52b is concave, and both the object side 52a and the image side 52b are aspherical. The material of the second lens 52 is plastic.

The third lens 53 has a positive refractive power, the object side 53a is convex, the image side 53b is convex, and both the object side 53a and the image side 53b are spherical. The material of the third lens 53 is glass.

The fourth lens 54 has a positive refractive power, the object side 54a is convex, the image side 54b is convex, and both the object side 54a and the image side 54b are aspherical. The material of the fourth lens 54 is plastic.

The fifth lens 55 has a positive refractive power, the object side 55a is convex, the image side 55b is convex, and both the object side 55a and the image side 55b are spherical. The material of the fifth lens 55 is glass.

The sixth lens 56 has a negative refractive power, the object side 56a is concave, the image side 56b is convex, and both the object side 56a and the image side 56b are spherical. The material of the sixth lens 56 is glass. The image side surface 55b of the fifth lens 55 and the object side surface 56a of the sixth lens 56 have the same curvature radius, and are bonded to each other to form a cemented lens.

The filter element 57 is disposed between the sixth lens 56 and the imaging surface 59 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). Both surfaces 57a and 57b of the filter element 57 are flat surfaces, and the material is glass.

The protective glass 58 is disposed on the image sensing element 500 , the two surfaces 58 a and 58 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 500 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical image capturing lens group 50 of the fifth embodiment are listed in Table 12 and Table 13, respectively. In the fifth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. Fifth Embodiment EFL = 2.5 mm, Fno = 2.6, HFOV = 68 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject unlimited unlimited first lens 51a spherical 14.983 0.500 1.746 49.3 -7.39 Glass 51b spherical 3.957 2.825 second lens 52a Aspherical 7.897 0.924 1.533 56.0 -7.80 plastic 52b Aspherical 2.603 1.503 third lens 53a spherical 31.984 4.529 1.812 25.4 13.47 Glass 53b spherical -15.285 0.222 aperture ST flat unlimited 1.336 fourth lens 54a Aspherical 32835.700 1.105 1.533 56.0 10.90 plastic 54b Aspherical -5.781 0.747 Fifth lens 55a spherical 30.091 2.670 1.757 52.4 4.13 Glass 55b (glue side) spherical -3.354 0.000 sixth lens 56a (glued side) spherical -3.354 1.240 1.902 20.4 -8.33 Glass 56b spherical -7.117 1.410 filter element 57a flat unlimited 0.210 1.517 64.2 Glass 57b flat unlimited 4.164 protective glass 58a flat unlimited 0.400 1.517 64.2 Glass 58b flat unlimited 0.189 Imaging plane 59 flat unlimited Reference wavelength: 550 nm Table 12 Aspheric coefficients of the fifth embodiment surface 52a 52b 54a 54b K 2.01E+00 -4.67E-01 -2.84E+09 -1.07E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.26E-03 5.73E-03 3.17E-03 2.86E-03 A ₆ -3.03E-04 3.58E-05 5.75E-04 4.10E-04 A ₈ 1.46E-05 -3.21E-05 -1.29E-05 1.99E-05 A ₁₀ -2.90E-07 5.62E-06 1.19E-07 1.46E-06 A ₁₂ -2.61E-09 2.69E-07 3.15E-08 -3.42E-08 Table 13

The numerical values of the relational expressions of the optical image capturing lens group 50 of the fifth embodiment are listed in Table 14. It can be seen from Table 14 that the optical image capturing lens group 50 of the fifth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value R1/EFL 6.01 R5/R4 12.29 (f5*Vd5+f6*Vd6)/f56 5.01 Vd1-Vd2+Vd3 18.66 CT3/CT1 9.06 f4 10.90 f56 9.33 RH41/RH62 0.65 f3/EFL 5.40 f4/EFL 4.37 f2/f1 1.05 f1/f6 0.89 f56/EFL 3.74 (R5+R6)/(R6-R5) -0.35 R11/EFL -1.35 Nd1 1.746 Nd3 1.812 Nd6 1.902 f3/AT23 8.97 TTL/BFL 3.76 Table 14

Referring to FIG. 5B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical image capturing lens group 50 , respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.01mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.03mm; and the distortion aberration can be controlled within 2%. As shown in FIG. 5B , the optical image capturing lens group 50 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Sixth Embodiment

Referring to FIG. 6A and FIG. 6B , FIG. 6A is a schematic diagram of an optical image capturing lens group according to a sixth embodiment of the present invention. FIG. 6B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the sixth embodiment of the present invention in order from left to right.

As shown in FIG. 6A , the optical image capturing lens group 60 of the sixth embodiment includes a first lens 61 , a second lens 62 , a third lens 63 , an aperture ST, a fourth lens 64 , a first lens 61 , a second lens 62 , a third lens 63 , an aperture ST, a fourth lens 64 , Fifth lens 65 and sixth lens 66 . The optical image capturing lens group 60 may further include a filter element 67 , a protective glass 68 and an imaging surface 69 . An image sensing element 600 can be further disposed on the imaging surface 69 to form an imaging device (not marked).

The first lens 61 has a negative refractive power, the object side 61a is convex, the image side 61b is concave, and both the object side 61a and the image side 61b are spherical. The material of the first lens 61 is glass.

The second lens 62 has a negative refractive power, the object side 62a is concave, the image side 62b is concave, and both the object side 62a and the image side 62b are aspherical. The material of the second lens 62 is plastic.

The third lens 63 has a positive refractive power, the object side 63a is convex, the image side 63b is convex, and both the object side 63a and the image side 63b are spherical. The material of the third lens 63 is glass.

The fourth lens 64 has a positive refractive power, the object side 64a is convex, the image side 64b is convex, and both the object side 64a and the image side 64b are aspherical. The material of the fourth lens 64 is glass.

The fifth lens 65 has a positive refractive power, the object side 65a is convex, the image side 65b is convex, and both the object side 65a and the image side 65b are spherical. The material of the fifth lens 65 is glass.

The sixth lens 66 has negative refractive power, the object side 66a is concave, the image side 66b is convex, and both the object side 66a and the image side 66b are spherical. The material of the sixth lens 66 is glass. The image side surface 65b of the fifth lens 65 and the object side surface 66a of the sixth lens 66 have the same curvature radius, and are bonded to each other to form a cemented lens.

The filter element 67 is disposed between the sixth lens 66 and the imaging surface 69 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 67a and 67b of the filter element 67 are both flat surfaces, and the material is glass.

The protective glass 68 is disposed on the image sensing element 600 , the two surfaces 68 a and 68 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 600 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical image capturing lens group 60 of the sixth embodiment are listed in Table 15 and Table 16, respectively. In the sixth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. Sixth Embodiment EFL = 2.08 mm, Fno = 2.49, HFOV = 70 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject unlimited unlimited first lens 61a spherical 13.013 0.400 1.808 46.6 -7.44 Glass 61b spherical 4.034 4.862 second lens 62a Aspherical -30.948 0.600 1.527 56.3 -5.26 plastic 62b Aspherical 3.047 1.593 third lens 63a spherical 30.445 2.800 1.932 21.3 9.00 Glass 63b spherical -10.848 0.374 aperture ST flat unlimited 1.705 fourth lens 64a Aspherical 1696.030 1.158 1.542 59.5 10.38 Glass 64b Aspherical -5.612 0.096 Fifth lens 65a spherical 39.125 3.565 1.777 49.6 3.89 Glass 65b (glued side) spherical -3.145 0.000 sixth lens 66a (glued side) spherical -3.145 2.008 1.957 17.9 -8.30 Glass 66b spherical -6.832 1.387 filter element 67a flat unlimited 0.210 1.517 64.2 Glass 67b flat unlimited 3.307 protective glass 68a flat unlimited 0.400 1.517 64.2 Glass 68b flat unlimited 0.519 Imaging plane 69 flat unlimited Reference wavelength: 550 nm Table 15 Aspheric coefficients of the sixth embodiment surface 62a 62b 64a 64b K -1.08E+02 -4.60E-01 5.98E+05 -1.15E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.60E-03 5.59E-03 3.12E-03 2.91E-03 A ₆ -3.73E-04 1.32E-04 5.89E-04 4.02E-04 A ₈ -2.21E-06 -1.91E-05 -9.37E-06 1.97E-05 A ₁₀ -1.81E-06 -4.28E-06 5.61E-07 1.89E-06 A ₁₂ 2.85E-07 -8.09E-06 4.84E-08 1.18E-07 Table 16

The numerical values of the relational expressions of the optical image capturing lens group 60 of the sixth embodiment are listed in Table 17. It can be seen from Table 17 that the optical image capturing lens group 60 of the sixth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value R1/EFL 6.27 R5/R4 9.99 (f5*Vd5+f6*Vd6)/f56 4.62 Vd1-Vd2+Vd3 11.58 CT3/CT1 7.00 f4 10.38 f56 9.52 RH41/RH62 0.69 f3/EFL 4.34 f4/EFL 5.01 f2/f1 0.71 f1/f6 0.90 f56/EFL 4.59 (R5+R6)/(R6-R5) -0.47 R11/EFL -1.52 Nd1 1.808 Nd3 1.932 Nd6 1.957 f3/AT23 5.65 TTL/BFL 4.29 Table 17

Referring to FIG. 6B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram, and the distortion aberration diagram of the optical image capturing lens group 60 , respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.04mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within + 0.02mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.05mm; and the distortion aberration can be controlled within 4%. As shown in FIG. 6B , the optical image capturing lens group 60 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Seventh Embodiment

A seventh embodiment of the present invention is an imaging device. The imaging device includes the optical image capturing lens group of the aforementioned first to sixth embodiments, and an image sensing element. The image sensing element is, for example, disposed in the optical image sensor. The imaging plane of the image capture lens group. The image sensing element is, for example, a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (Complementary Metal Oxide Semiconductor, CMOS) image sensing element. The imaging device is, for example, a camera module for vehicle photography, a camera module for portable electronic products, or a camera module for surveillance cameras. Eighth Embodiment

Please refer to FIG. 8 , which is a schematic diagram of an electronic device 1000 according to an eighth embodiment of the present invention. As shown, the electronic device 1000 includes an imaging device 1010 . The imaging device 1010 is, for example, the imaging device of the aforementioned seventh embodiment, which may be composed of the optical image capturing lens group of the present invention and an image sensing element. The electronic device 1000 is, for example, a vehicle camera, a surveillance camera, or an aerial camera.

Although the present invention is described using the foregoing embodiments, these embodiments are not intended to limit the scope of the present invention. For those skilled in the art to which the present invention pertains, various changes in form and details can still be made with reference to the content of the embodiments disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, it should be understood here that the present invention is subject to the definition of the following patent application scope, and any changes made within the application patent scope or its equivalent scope shall still fall into the application of the present invention. within the scope of the patent.

10, 20, 30, 40, 50, 60: Optical image capture lens group 11, 21, 31, 41, 51, 61: The first lens 12, 22, 32, 42, 52, 62: Second lens 13, 23, 33, 43, 53, 63: Third lens 4, 14, 24, 34, 44, 54, 64: Fourth lens 15, 25, 35, 45, 55, 65: Fifth lens 6, 16, 26, 36, 46, 56, 66: sixth lens 17, 27, 37, 47, 57, 67: Filter elements 18, 28, 38, 48, 58, 68: Protective glass 19, 29, 39, 49, 59, 69: Imaging surface 11a, 21a, 31a, 41a, 51a, 61a: the object side of the first lens 11b, 21b, 31b, 41b, 51b, 61b: the image side of the first lens 12a, 22a, 32a, 42a, 52a, 62a: the object side of the second lens 12b, 22b, 32b, 42b, 52b, 62b: the image side of the second lens 13a, 23a, 33a, 43a, 53a, 63a: the side of the object of the third lens 13b, 23b, 33b, 43b, 53b, 63b: the image side of the third lens 14a, 24a, 34a, 44a, 54a, 64a: the object side of the fourth lens 14b, 24b, 34b, 44b, 54b, 64b: the image side of the fourth lens 15a, 25a, 35a, 45a, 55a, 65a: the object side of the fifth lens 15b, 25b, 35b, 45b, 55b, 65b: the image side of the fifth lens 16a, 26a, 36a, 46a, 56a, 66a: the side of the sixth lens 16b, 26b, 36b, 46b, 56b, 66b: the image side of the sixth lens 17a, 17b, 27a, 27b, 37a, 37b, 47a, 47b, 57a, 57b, 67a, 67b: the second surface of the filter element 18a, 18b, 28a, 28b, 38a, 38b, 48a, 48b, 58a, 58b, 68a, 68b: the second surface of the protective glass 100, 200, 300, 400, 500, 600: Image sensing elements 1000: Electronics 1010: Imaging Devices I: Optical axis ST: Aperture RH41: The maximum optical effective radius of the fourth lens object side RH62: The maximum optical effective radius of the sixth lens image side

[FIG. 1A] is a schematic diagram of an optical image capturing lens assembly according to the first embodiment of the present invention; [FIG. 1B] are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram, and the distortion aberration diagram of the first embodiment of the present invention in order from left to right; [FIG. 2A] is a schematic diagram of an optical image capturing lens assembly according to the second embodiment of the present invention; [FIG. 2B] is a longitudinal spherical aberration diagram, an astigmatic field curvature aberration diagram, and a distortion aberration diagram of the second embodiment of the present invention in order from left to right; [FIG. 3A] is a schematic diagram of an optical image capturing lens assembly according to a third embodiment of the present invention; [FIG. 3B] is the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram and the distortion aberration diagram of the third embodiment of the present invention in order from left to right; [FIG. 4A] is a schematic diagram of an optical image capturing lens assembly according to a fourth embodiment of the present invention; [FIG. 4B] is the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram and the distortion aberration diagram of the fourth embodiment of the present invention in order from left to right; [FIG. 5A] is a schematic diagram of an optical image capturing lens assembly according to a fifth embodiment of the present invention; [FIG. 5B] is the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the fifth embodiment of the present invention in order from left to right; [FIG. 6A] is a schematic diagram of an optical image capturing lens assembly according to a sixth embodiment of the present invention; [FIG. 6B] are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the sixth embodiment of the present invention in order from left to right; [FIG. 7A] is a schematic diagram of the maximum optical effective radius of the object side surface of the fourth lens of the optical image capturing lens group of the present invention; [ FIG. 7B ] is a schematic diagram of the maximum optical effective radius of the image side surface of the sixth lens of the optical image capturing lens group of the present invention; and [FIG. 8] is a schematic diagram of an electronic device according to an eighth embodiment of the present invention.

10: Optical image capture lens group

11: The first lens

12: Second lens

13: The third lens

14: Fourth lens

15: Fifth lens

16: Sixth lens

17: Filter element

18: Protective glass

19: Imaging surface

11a: The side of the object of the first lens

11b: Image side of the first lens

12a: The side of the object of the second lens

12b: Side of the image of the second lens

13a: The side of the object of the third lens

13b: Side view of the image of the third lens

14a: The side of the object of the fourth lens

14b: The image side of the fourth lens

15a: The side of the object of the fifth lens

15b: Side view of the image of the fifth lens

16a: The side of the object of the sixth lens

16b: Side view of the image of the sixth lens

17a, 17b: The second surface of the filter element

18a, 18b: The second surface of the protective glass

100: Image Sensing Components

I: Optical axis

ST: Aperture

Claims (11)

An optical image capturing lens group, from the object side to the image side, comprises: a first lens, with negative refractive power, the object side is convex, the image side is concave; a second lens, with negative refractive power, the The image side is concave; a third lens has positive refractive power, the object side is convex, and the image side is convex; an aperture; a fourth lens has positive refractive power, and its image side is convex; a fifth lens, It has positive refractive power, its object side is convex, and its image side is convex; and a sixth lens has negative refractive power, its object side is concave, and its image side is convex; wherein, the fifth lens and the sixth lens constitute A cemented lens; wherein, the total number of lenses in the optical image capturing lens group is six; wherein, the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the second lens is R4, and the third lens The curvature radius of the side surface of the object is R5, the effective focal length of the optical image capturing lens group is EFL, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the combination of the fifth lens and the sixth lens The focal length is f56, the dispersion coefficient of the fifth lens is Vd5, and the dispersion coefficient of the sixth lens is Vd6, which satisfy the following relations: 2<R1/EFL<7; 6<R5/R4<20; and 2<( f5*Vd5+f6*Vd6)/f56<7. According to the optical image capturing lens set of claim 1, wherein the dispersion coefficient of the first lens is Vd1, the dispersion coefficient of the second lens is Vd2, the dispersion coefficient of the third lens is Vd3, and the following relationship is satisfied Formula: Vd1-Vd2+Vd3<20. An optical image capturing lens group, from the object side to the image side, comprises: A first lens with negative refractive power, and its object side is convex and its image side is concave; a second lens, with negative refractive power, its image side is concave; a third lens, with positive refractive power, its object side is convex, the image side is convex; an aperture; a fourth lens has positive refractive power, and its image side is convex; a fifth lens has positive refractive power, its object side is convex, and its image side is convex; and a The sixth lens has a negative refractive power, the object side is concave, and the image side is convex; wherein, the fifth lens and the sixth lens form a cemented lens; wherein, the total number of lenses in the optical image capturing lens group is six Among them, the focal length of the fourth lens is f4, the combined focal length of the fifth lens and the sixth lens is f56, the maximum effective optical radius of the object side of the fourth lens is RH41, and the maximum effective optical radius of the image side of the sixth lens The optical radius is RH62, which satisfies the following relationship: f4>f56; and 0.4<RH41/RH62<0.8. According to the optical image capturing lens set of item 1 or item 3 of the claimed scope, wherein the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following relationship: 0.6<f2/f1 < 1.3. According to the optical image capturing lens set as claimed in item 1 or 3 of the claimed scope, wherein the combined focal length of the fifth lens and the sixth lens is f56, and the effective focal length of the optical image capturing lens set is EFL, which is The following relationship is satisfied: 2.5<f56/EFL<5. For the optical image capturing lens set of item 1 or item 3 of the scope of the patent application, wherein the curvature radius of the object side surface of the third lens is R5, and the curvature radius of the image side surface is R6, the following relational expressions are satisfied: -0.7<(R5+R6)/(R6-R5)<0.2. According to the optical image capturing lens set of item 1 or 3 of the claimed scope, wherein, the curvature radius of the object side surface of the sixth lens is R11, and the effective focal length of the optical image capturing lens set is EFL, which satisfies the following Relational formula: -1.6<R11/EFL<-0.8. For the optical image capturing lens set of item 1 or item 3 of the claimed scope, the distance between the image side of the second lens and the object side of the third lens on the optical axis is AT23, and the distance of the third lens on the optical axis is AT23. The focal length is f3, which satisfies the following relation: 4<f3/AT23<13. According to the optical image capturing lens group of claim 1 or item 3 of the claimed scope, wherein the distance between the image side surface of the sixth lens and the imaging plane of the optical image capturing lens group on the optical axis is BFL, and the distance on the optical axis of the sixth lens is BFL. The distance between the object side of a lens and the imaging plane of the optical image capturing lens group on the optical axis is TTL, which satisfies the following relationship: 3<TTL/BFL<5. An imaging device comprising the optical image capturing lens group as claimed in item 1 or item 3 of the scope of application, and an image sensing element, wherein the image sensing element is disposed between the optical image capturing lens group imaging surface. An electronic device comprising the imaging device as claimed in item 10 of the patent application scope.

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