TW202328735A - Lens assembly and image capture apparatus thereof - Google Patents

Abstract

A lens assembly and an image capture apparatus thereof are provided. The lens assembly includes a first lens group, a second lens group, and a third lens group, all of which are arranged in order from a first side to a second side along an optical axis. The first lens group is with positive refractive power. The second lens group is with positive refractive power. The third lens group is with positive refractive power. The image capture apparatus includes the lens assembly, an image sensor element, a light path turning element, and an actuator. The light path turning element, the lens assembly, and the image sensor element are arranged in order from the first side to the second side along the optical axis. The actuator is disposed on a side of the lens assembly. The first lens group is fixed, the second lens group can be driven by the actuator to move along the optical axis, and the third lens group can be driven by the actuator to move along the optical axis, so that the image capture apparatus can zoom from a wide-angle end to a telephoto end to change focal length.

Description

Imaging lens and image capture device thereof (65)

The invention relates to an imaging lens and an image capturing device thereof.

The total length of the optical zoom lens is usually longer, and the higher the zoom ratio, the longer the total length of the lens. Nowadays, thin and light camera devices such as smartphones, tablets, mobile devices, etc. cannot be equipped with too long optical zoom lenses. . Therefore, another imaging lens with a new architecture is required to meet the miniaturization, high resolution and optical zoom function at the same time, so as to meet the demand for optical zoom function of smartphones.

In view of this, the main purpose of the present invention is to provide an imaging lens and an image capture device thereof, which has a shorter overall length, higher resolution, and optical zoom function, but still has good optical performance.

The imaging lens of the present invention includes a first lens group, a second lens group and a third lens group. The first lens group has positive refractive power. The second lens group has positive refractive power. The third lens group has positive refractive power. The first lens group, the second lens group and the third lens group are sequentially arranged along an optical axis from a first side to a second side.

Wherein the first lens group includes a first lens, a second lens and a third lens. The first lens, the second lens and the third lens are arranged in sequence from the first side to the second side along the optical axis. The second lens group includes a fourth lens and a fifth lens, and the fourth lens and the fifth lens are arranged in sequence from the first side to the second side along the optical axis. The third lens group includes a sixth lens, a seventh lens and an eighth lens, and the sixth lens, the seventh lens and the eighth lens are arranged in sequence from the first side to the second side along the optical axis.

Wherein the first lens has negative refractive power. The second lens has positive refractive power. The third lens has negative refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has negative refractive power. The seventh lens has positive refractive power. The eighth lens has positive refractive power.

Wherein the first lens is a meniscus lens, and includes a convex surface facing the first side and a concave surface facing the second side. The second lens is a biconvex lens, and includes a convex surface facing the first side and another convex surface facing the second side. The third lens is a meniscus lens and includes a convex surface facing the first side and a concave surface facing the second side. The fourth lens is a meniscus lens, and includes a concave surface facing the first side and a convex surface facing the second side. The fifth lens is a meniscus lens, and includes a concave surface facing the first side and a convex surface facing the second side. The sixth lens is a meniscus lens, and includes a concave surface facing the first side and a convex surface facing the second side. The seventh lens is a meniscus lens, and includes a concave surface facing the first side and a convex surface facing the second side. The eighth lens includes a convex surface facing the second side.

The eighth lens is a biconvex lens, and may further include another convex surface facing the first side.

The eighth lens is a meniscus lens, and may further include a concave surface facing the first side.

The first lens group is fixed, the second lens group is movable along the optical axis, and the third lens group is movable along the optical axis, so that the imaging lens zooms from a wide-angle end to a telephoto end to change the focal length.

The imaging lens of the present invention may further include an aperture disposed between the first side and the second side, and the imaging lens may be zoomed from a wide-angle end to a telephoto end to change the focal length, wherein the imaging lens at least satisfies one of the following conditions: 3<TTL /STD<5;4<(f7+f8)/STD<12; 180mm ² <f7×f8<800mm ² ; 5<(f4+f5)/STD<8; 250mm ² <f4×f5<350mm ² ; 20mm ² <R51×R52<62mm ² ; 4.6<(EFLw+EFLt)/STD<7; among them, TTL is the distance between the first side of the first lens and an imaging surface along the optical axis, and STD is one of the apertures Optical effective diameter, f4 is one of the effective focal length of the fourth lens, f5 is one of the effective focal length of the fifth lens, f7 is one of the effective focal length of the seventh lens, f8 is one of the effective focal length of the eighth lens, R51 is one of the fifth lens A radius of curvature of the first side, R52 is a radius of curvature of a second side of the fifth lens, EFLw is an effective focal length of the imaging lens at the wide-angle end, and EFLt is an effective focal length of the imaging lens at the telephoto end.

The imaging lens can be zoomed from a wide-angle end to a telephoto end to change the focal length, and the imaging lens meets at least one of the following conditions: 2.2<TTL/(G12w+G12t)<4.4; 7<TTL/(G23w+G23t)<20; 1 <G12w/G23w<6; 3<G12t/G23t<9; 3<G12t-G12w<6; 9mm<EFLt-EFLw<13mm; where, TTL is one of the first side of the first lens to an imaging surface along the light The distance between the axes, G12w is the distance between the first lens group and the second lens group along the optical axis at the wide-angle end, G12t is the distance between the first lens group and the second lens group along the optical axis at the telephoto end, G23w is the distance between the second lens group and the third lens group along the optical axis at the wide-angle end, G23t is the distance between the second lens group and the third lens group along the optical axis at the telephoto end, EFLw is the imaging lens at the wide-angle end One of the effective focal lengths, EFLt is one of the effective focal lengths of the imaging lens at the telephoto end.

The image capturing device of the present invention includes an imaging lens, an image sensing element, an optical path turning element and an actuator. The image sensing element is disposed between the third lens group and the second side. The optical path turning element is arranged between the first side and the first lens group. The actuator is set in the Like one side of the lens. The optical path turning element, the imaging lens and the image sensing element are sequentially arranged along the optical axis from the first side to the second side. The first lens group is fixed, the second lens group can be driven by the actuator to move along the optical axis toward the second side, and the third lens group can be driven by the actuator to move along the optical axis toward the second side to make the image The capture device zooms from a wide-angle end to a telephoto end to change the focal length.

In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with the accompanying drawings.

1, 2, 3, 4: imaging lens

LG11, LG21, LG31, LG41: the first lens group

ST11, ST21, ST31: Aperture

LG12, LG22, LG32, LG42: Second lens group

LG13, LG23, LG33, LG43: third lens group

OF1, OF2, OF3: Filters

L11, L21, L31: first lens

L12, L22, L32: second lens

L13, L23, L33: third lens

L14, L24, L34: fourth lens

L15, L25, L35: fifth lens

L16, L26, L36: sixth lens

L17, L27, L37: seventh lens

L18, L28, L38: eighth lens

IMA1, IMA2, IMA3: imaging surface

OA1, OA2, OA3, OA4: optical axis

S11, S21, S31: the first side of the first lens

S12, S22, S32: the second side of the first lens

S13, S23, S33: the first side of the second lens

S14, S24, S34: the second side of the second lens

S15, S25, S35: the first side of the third lens

S16, S26, S36: the second side of the third lens

S18, S28, S38: the first side of the fourth lens

S19, S29, S39: the second side of the fourth lens

S110, S210, S310: the first side of the fifth lens

S111, S211, S311: the second side of the fifth lens

S112, S212, S312: the first side of the sixth lens

S113, S213, S313: the second side of the sixth lens

S114, S214, S314: the first side of the seventh lens

S115, S215, S315: the second side of the seventh lens

S116, S216, S316: the first side of the eighth lens

S117, S217, S317: the second side of the eighth lens

S118, S218, S318: the first side of the filter

S119, S219, S319: the second side of the filter

S17, S27, S37: shading one-sided

100: image capture device

P1: Optical path turning element

ISE1: Image Sensing Element

ACT1: Actuator

S10, S20, S30: aperture surface

ST12, ST22, ST32: shading film

Figures 1 and 2 are schematic diagrams of the lens configuration and optical path at the wide-angle end and telephoto end of the first embodiment of the imaging lens according to the present invention.

Figures 3A, 3B, and 3C are Field Curvature, Distortion, and Modulation Transfer Function diagrams at the wide-angle end of the first embodiment of the imaging lens according to the present invention.

Figures 4 and 5 are schematic diagrams of the lens configuration and optical path at the wide-angle end and telephoto end according to the second embodiment of the imaging lens of the present invention.

Figures 6 and 7 are schematic diagrams of the lens configuration and optical path at the wide-angle end and the telephoto end according to the third embodiment of the imaging lens of the present invention.

Fig. 8 is a schematic diagram of an embodiment of an image capture device according to the present invention.

The present invention provides an imaging lens, comprising: a first lens group, the first lens group has positive refractive power; a second lens group, the second lens group has positive refractive power; and a third lens group, the third lens The group has positive refractive power; the first lens group, the second lens group and the third lens group are sequentially arranged along an optical axis from a first side to a second side.

The present invention provides an image capture device, comprising: an imaging lens; an image sensing element; an optical path turning element; and an actuator; wherein the image sensing element is disposed between the third lens group and the second side; wherein The optical path turning element is arranged between the first side and the first lens group; wherein the actuator is arranged on one side of the imaging lens; wherein the optical path turning element, the imaging lens and the image sensing element are along the optical axis from the first side to the second The two sides are arranged in sequence; wherein the first lens group is fixed, the second lens group can be driven by the actuator to move along the optical axis toward the second side, and the third lens group can be driven by the actuator to move along the optical axis toward the second side. The second side moves to make the image capture device zoom from a wide-angle end to a telephoto end to change the focal length.

The focal length of the imaging lens of the present invention is a variable focal length. Each embodiment of the imaging lens zooms from the wide-angle end to the telephoto end, and its zoom ratio is about 2 times. When it is configured with another fixed-focus wide-angle lens on a mobile phone, a tablet or other camera , so that the effective focal length of the imaging lens of the present invention has a zoom ratio of, for example, 4 times to 8 times relative to the effective focal length of the fixed-focus wide-angle lens. Taking the imaging lens of the first embodiment of the present invention as an example, the effective focal length at the wide-angle end is 15.082mm, and the effective focal length at the telephoto end is 25.629mm. The zoom ratio from the wide-angle end to the telephoto end is 1.70 (25.629mm/15.082mm= 1.70) times, that is, about 2 times, when it is configured with a fixed-focus wide-angle lens with an effective focal length of 3.40mm on a mobile phone, a tablet or other camera devices, the effective focal length of the fixed-focus wide-angle lens is used as the magnification basis, which will make the present invention Compared with the fixed-focus wide-angle lens with an effective focal length of 3.40mm, the imaging lens has a zoom ratio of 4 (15.082mm/3.40mm=4.44≒4) times to 8 (25.629mm/3.40mm=7.54≒8) times. However, the present invention is not limited thereto. When another fixed-focus wide-angle lens is configured together with the camera device, it can have a higher zoom ratio, for example, more than 10 times.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, and Table 8 below, wherein Table 1, Table 4, and Table 7 are the first to third embodiments of the imaging lens according to the present invention. Table 2, Table 5, and Table 8 are related parameter tables of the lens, and Table 1, Table 4, and Table 7 are the relevant parameter tables of the aspheric surface of the aspheric lens in Table 1, Table 4, and Table 7, respectively.

Figures 1, 4, and 6 are schematic diagrams of the lens configuration and optical path at the wide-angle end of the first, second, and third embodiments of the imaging lens of the present invention, and Figures 2, 5, and 7 are respectively the first imaging lens of the present invention. 2. Schematic diagram of the lens configuration and optical path at the telephoto end of the second and third embodiments, wherein the first lens group LG11, LG21, LG31 has positive refractive power and includes a first lens L11, L21, L31, a second lens L12, L22, L32 and a third lens L13, L23, L33, the second lens group LG12, LG22, LG32 have positive refractive power and respectively include a fourth lens L14, L24, L34 and a fifth lens L15, L25, L35, the third lens The groups LG13 , LG23 , LG33 have positive refractive power and respectively include a sixth lens L16 , L26 , L36 , a seventh lens L17 , L27 , L37 and an eighth lens L18 , L28 , L38 .

The first lenses L11, L21, L31 are meniscus lenses with negative refractive power, made of glass material, the first side S11, S21, S31 is convex, the second side S12, S22, S32 is concave, the first side S11 , S21, S31 and the second side surfaces S12, S22, S32 are all aspherical surfaces. The second lenses L12, L22, L32 are biconvex lenses with positive refractive power, made of glass material, the first side S13, S23, S33 is convex, the second side S14, S24, S34 is convex, the first side S13, S23 , S33 and the second side surfaces S14, S24, S34 are all aspherical surfaces. The third lens L13, L23, L33 is a meniscus lens with negative refractive power, made of glass material, the first side S15, S25, S35 is convex, the second side S16, S26, S36 is concave, the first side S15 , S25 , S35 and the second side surfaces S16 , S26 , S36 are all aspherical surfaces. The fourth lens L14, L24, L34 are meniscus lenses with positive refractive power, made of plastic material, the first side S18, S28, S38 is concave, the second side S19, S29, S39 is convex, the first side S18, S28, S38 and The second side surfaces S19, S29, S39 are all aspheric surfaces. The fifth lens L15, L25, L35 is a meniscus lens with positive refractive power, made of plastic material, the first side S110, S210, S310 is concave, the second side S111, S211, S311 is convex, the first side S110 , S210 , S310 and the second side surfaces S111 , S211 , S311 are all aspherical surfaces. The sixth lens L16, L26, L36 is a meniscus lens with negative refractive power, made of plastic material, the first side S112, S212, S312 is concave, the second side S113, S213, S313 is convex, the first side S112 , S212, S312 and the second side surfaces S113, S213, S313 are all aspherical surfaces. The seventh lens L17, L27, L37 is a meniscus lens with positive refractive power, made of plastic material, the first side S114, S214, S314 is concave, the second side S115, S215, S315 is convex, the first side S114 , S214, S314 and the second side surfaces S115, S215, S315 are all aspherical surfaces. The eighth lenses L18, L28, L38 have positive refractive power and are made of plastic material. The second side surfaces S117, S217, S317 are convex, and the first side surfaces S116, S216, S316 and the second side surfaces S117, S217, S317 are all non-convex. spherical surface.

In addition, imaging lenses 1, 2, and 3 at least meet one of the following conditions (1) to (13):

3<TTL/STD<5; (1)

4<(f7+f8)/STD<12; (2)

180mm ² <f7×f8<800mm ² ; (3)

5<(f4+f5)/STD<8; (4)

250mm ² <f4×f5<350mm ² ; (5)

20mm ² <R51×R52<62mm ² ; (6)

4.6<(EFLw+EFLt)/STD<7; (7)

2.2<TTL/(G12w+G12t)<4.4; (8)

7<TTL/(G23w+G23t)<20; (9)

1<G12w/G23w<6; (10)

3<G12t/G23t<9; (11)

3<G12t-G12w<6; (12)

9mm<EFLt-EFLw<13mm; (13)

Among them, TTL is the first to third embodiment, the first side S11, S21, S31 of the first lens L11, L21, L31 respectively to the imaging surface IMA1, IMA2, IMA3 along the optical axis OA1, OA2, OA3 STD is one of the optical effective diameters of the aperture ST11, ST21, ST31 in the first embodiment to the third embodiment, and f4 is the fourth lens L14, L24, L34 in the first embodiment to the third embodiment One effective focal length, f5 is one effective focal length of the fifth lens L15, L25, L35 in the first embodiment to the third embodiment, f7 is the seventh lens L17, L27 in the first embodiment to the third embodiment , one of the effective focal lengths of L37, f8 is one of the effective focal lengths of the eighth lens L18, L28, L38 in the first embodiment to the third embodiment, R51 is the fifth lens L15 in the first embodiment to the third embodiment , the radius of curvature of the first side S110, S210, S310 of L25, L35, R52 is one of the second side S111, S211, S311 of the fifth lens L15, L25, L35 in the first embodiment to the third embodiment Radius of curvature, EFLw is the effective focal length of one of the imaging lenses 1, 2, 3 at the wide-angle end in the first embodiment to the third embodiment, EFLt is in the first embodiment to the third embodiment, the imaging lenses 1, 2, 3 3 An effective focal length at the telephoto end, G12w is the first lens group LG11, LG21, LG31 to the second lens group in the first embodiment to the third embodiment LG12, LG22, LG32 at the wide-angle end along the distance between the optical axes OA1, OA2, OA3, G12t is the distance from the first lens group LG11, LG21, LG31 to the second lens group LG12, LG22, LG32 at the telephoto end along the distance between the optical axes OA1, OA2, OA3, G23w is the distance from the second lens group LG12, LG22, LG32 to the third lens group LG13, LG23, LG33 is at the wide-angle end along the distance between the optical axes OA1, OA2, and OA3. G23t is the distance between the second lens group LG12, LG22, and LG32 and the third lens group LG13, LG23, and LG33 in the first embodiment to the third embodiment. The telephoto end is spaced along one of the optical axes OA1, OA2, and OA3. The imaging lenses 1, 2, and 3 can effectively shorten the total length of the lenses, effectively improve resolution, effectively correct aberrations, effectively correct chromatic aberrations, and realize optical zoom functions.

The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Fig. 1 and Fig. 2 at the same time. The imaging lens 1 sequentially includes an aperture ST11, a first lens group LG11, a shading sheet ST12, and a second side along an optical axis OA1 from a first side to a second side The second lens group LG12, a third lens group LG13 and an optical filter OF1. The first lens group LG11 sequentially includes a first lens L11 , a second lens L12 and a third lens L13 along the optical axis OA1 from the first side to the second side. The second lens group LG12 sequentially includes a fourth lens L14 and a fifth lens L15 along the optical axis OA1 from the first side to the second side. The third lens group LG13 sequentially includes a sixth lens L16 , a seventh lens L17 and an eighth lens L18 along the optical axis OA1 from the first side to the second side. During imaging, the light from the first side is finally imaged on an imaging surface IMA1.

When the imaging lens 1 zooms from the wide-angle end (as shown in Figure 1) to the telephoto end (as shown in Figure 2), the first lens group LG11 is fixed, and the second lens group LG12 moves to the second side along the optical axis OA1 Move, the third lens group LG13 moves to the second side along the optical axis OA1, so that the distance between the first lens group LG11 and the second lens group LG12 becomes larger, the second lens group LG12 and the third lens group LG12 The distance between the lens group LG13 becomes larger. When the imaging lens 1 of the first embodiment zooms from the wide-angle end (as shown in FIG. 1 ) to the telephoto end (as shown in FIG. 2 ), its zoom ratio is about 1.70 times (25.629mm/15.082mm≒1.70).

According to the first to sixth paragraphs of [implementation mode], wherein: the eighth lens L18 is a biconvex lens, and its first side S116 is a convex surface; the first side S118 and the second side S119 of the optical filter OF1 are both planes; using the above lens , the aperture ST11, the shading sheet ST12 and the design satisfying at least one of the conditions (1) to (13), so that the imaging lens 1 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, and effectively Correct chromatic aberration and achieve optical zoom function.

Table 1 is a table of related parameters of the imaging lens 1 in Fig. 1 and Fig. 2 respectively at the wide-angle end and the telephoto end.

The aspherical surface sag z of the aspheric lens in Table 1 is obtained by the following formula, z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶ , where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 2 is a list of relevant parameters of the aspheric surface of the aspheric lens in Table 1, where k is the conic constant, and A~G are the aspheric coefficients.

Table 3 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values corresponding to conditions (1) to conditions (13). As can be seen from Table 3, the imaging lens 1 of the first embodiment can all Satisfy the requirements of condition (1) to condition (13).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from FIG. 3A that the field curvature of the imaging lens 1 of the first embodiment is between -0.6 mm and 0.1 mm at the wide-angle end. It can be seen from FIG. 3B that the distortion of the imaging lens 1 of the first embodiment is between 0% and 1.2% at the wide-angle end. It can be seen from FIG. 3C that the imaging lens 1 of the first embodiment has a modulation transfer function value between 0.58 and 1.0 at the wide-angle end. It is obvious that the field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

The second embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Fig. 4 and Fig. 5 at the same time. The imaging lens 2 sequentially includes an aperture ST21, a first lens group LG21, a shading sheet ST22, and a second side along an optical axis OA2 from a first side to a second side. The second lens group LG22, a third lens group LG23 and an optical filter OF2. The first lens group LG21 sequentially includes a first lens L21 , a second lens L22 and a third lens L23 along the optical axis OA2 from the first side to the second side. The second lens group LG22 sequentially includes a fourth lens L24 and a fifth lens L25 along the optical axis OA2 from the first side to the second side. The third lens group LG23 sequentially includes a sixth lens L26 , a seventh lens L27 and an eighth lens L28 along the optical axis OA2 from the first side to the second side. imaging , the light from the first side is finally imaged on an imaging surface IMA2.

When the imaging lens 2 zooms from the wide-angle end (as shown in Figure 4) to the telephoto end (as shown in Figure 5), the first lens group LG21 is fixed, and the second lens group LG22 moves to the second side along the optical axis OA2 Move, the third lens group LG23 moves to the second side along the optical axis OA2, so that the distance between the first lens group LG21 and the second lens group LG22 becomes larger, and the distance between the second lens group LG22 and the third lens group LG23 becomes larger . When the imaging lens 2 of the second embodiment zooms from the wide-angle end (as shown in FIG. 4 ) to the telephoto end (as shown in FIG. 5 ), its zoom ratio is about 1.97 times (25.788mm/13.100mm≒1.97).

According to the first to sixth paragraphs of [implementation mode], wherein: the eighth lens L28 is a biconvex lens, and its first side S216 is a convex surface; the first side S218 and the second side S219 of the optical filter OF2 are both planes; using the above lens , the aperture ST21, the shading sheet ST22 and the design satisfying at least one of the conditions (1) to (13), so that the imaging lens 2 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, and effectively Correct chromatic aberration and achieve optical zoom function.

Table 4 is a table of relevant parameters of each lens in which the imaging lens 2 in Fig. 4 and Fig. 5 is respectively at the wide-angle end and the telephoto end.

The definition of the aspheric surface concavity z of the aspheric lens in Table 4 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be repeated here. Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

Table 6 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to conditions (1) to (13). As can be seen from Table 6, the imaging lens 2 of the second embodiment can all satisfy the condition (1 ) to the requirements of condition (13).

In addition, the field curvature (illustration omitted) and distortion (illustration omitted) of the imaging lens 2 of the second embodiment can also be effectively corrected, and the image resolution can also meet the requirements, thereby obtaining better optical performance.

The third embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Fig. 6 and Fig. 7 at the same time, the imaging lens 3 includes an aperture ST31, a first lens group LG31, a light shielding sheet ST32, a The second lens group LG32, a third lens group LG33 and an optical filter OF3. The first lens group LG31 sequentially includes a first lens L31 , a second lens L32 and a third lens L33 along the optical axis OA3 from the first side to the second side. The second lens group LG32 sequentially includes a fourth lens L34 and a fifth lens L35 along the optical axis OA3 from the first side to the second side. The third lens group LG33 sequentially includes a sixth lens L36 , a seventh lens L37 and an eighth lens L38 along the optical axis OA3 from the first side to the second side. During imaging, the light from the first side is finally imaged on an imaging surface IMA3.

The imaging lens 3 zooms from the wide-angle end (as shown in Figure 6) to the telephoto end (as shown in Figure 7 As shown in the figure), the first lens group LG31 is fixed, the second lens group LG32 moves to the second side along the optical axis OA3, and the third lens group LG33 moves to the second side along the optical axis OA3, so that the first lens group The distance between the second lens group LG31 and the second lens group LG32 becomes larger, and the distance between the second lens group LG32 and the third lens group LG33 becomes larger. When the imaging lens 3 of the third embodiment zooms from the wide-angle end (as shown in FIG. 6 ) to the telephoto end (as shown in FIG. 7 ), its zoom ratio is about 1.82 times (25.634mm/14.074mm≒1.82).

According to the first to sixth paragraphs of [implementation mode], wherein: the eighth lens L38 is a meniscus lens, and its first side S316 is a concave surface; the first side S318 and the second side S319 of the optical filter OF3 are both planes; The design of the above-mentioned lens, aperture ST31, light-shielding sheet ST32 and at least one of the conditions (1) to (13) can make the imaging lens 3 effectively shorten the total length of the lens, effectively improve the resolution, and effectively correct aberrations , Effective correction of chromatic aberration and realization of optical zoom function.

Table 7 is a table of relevant parameters of each lens in which the imaging lens 3 in Fig. 6 and Fig. 7 is respectively at the wide-angle end and the telephoto end.

The definition of the aspheric surface concavity z of the aspheric lens in Table 7 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be repeated here. Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

Table nine is the relevant parameter value of the imaging lens 3 of the third embodiment and the calculated value corresponding to condition (1) to condition (13), as can be seen from table nine, the imaging lens 3 of the third embodiment can all Satisfy the requirements of condition (1) to condition (13).

In addition, the field curvature (illustration omitted) and distortion (illustration omitted) of the imaging lens 3 of the third embodiment can also be effectively corrected, and the image resolution can also meet the requirements, thereby obtaining better optical performance.

An embodiment of the image capturing device of the present invention will now be described in detail. Please refer to FIG. 8 , the image capture device 100 includes an optical path turning element P1 , an imaging lens 4 , an image sensing element ISE1 and an actuator ACT1 . The imaging lens 4 sequentially includes a first lens group LG41 , a second lens group LG42 and a third lens group LG43 from a first side to a second side along an optical axis OA4 . The optical path turning element P1 is disposed between the first side and the first lens group LG41. The image sensing element ISE1 is disposed between the third lens group LG41 and the second side. The actuator ACT1 is disposed on one side of the imaging lens 4 . The optical path turning element P1 , the imaging lens 4 and the image sensing element ISE1 are arranged in sequence from the first side to the second side along the optical axis OA4 . When imaging, the light from the object (not shown) enters the optical path turning element P1 first, and the optical path turning element P1 bends the incident light by 90 degrees before entering the imaging lens 4, and the imaging lens 4 then forms the image of the object (not shown) in the image sensor ISE1. The actuator ACT1 can drive the second lens group LG42 and the third lens group LG43, so that the second lens group LG42 moves toward the second side along the optical axis OA4 and the third lens group LG43 moves toward the second side along the optical axis OA4. The two sides move so that the imaging lens 4 zooms from a wide-angle end to a telephoto end to change the focal length of the imaging lens 4. In other words, when the imaging lens 4 zooms from a wide-angle end to a telephoto end, the first lens group LG41 is fixed, and the second lens group LG41 is fixed. The second lens group LG42 and the third lens group LG43 move to the second side along the optical axis OA4. The actuator ACT1 in this embodiment can be a driving element that is coupled with a magnet to generate magnetic force through the coil being energized, but it is not limited thereto. The actuator ACT1 can also be a voice coil motor, a stepping motor, or a piezoelectric material. Drive elements such as actuators or shape memory metal (Shape Memory Alloy, SMA) actuators.

The above-mentioned optical path turning element P1 is a mirror, and it can also be changed into a mirror, which should also belong to the scope of the present invention.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any skilled person can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be defined by the scope of the appended patent application.

1: Imaging lens

LG11: The first lens group

LG12: Second lens group

ST11: Aperture

LG13: The third lens group

L11: first lens

L12: second lens

L13: third lens

L14: Fourth lens

L15: fifth lens

L16: sixth lens

L17: seventh lens

L18: eighth lens

OF1: filter

IMA1: imaging surface

OA1: optical axis

S11: the first side of the first lens

S12: the second side of the first lens

S13: the first side of the second lens

S14: the second side of the second lens

S15: The first side of the third lens

S16: The second side of the third lens

S17: shading one-sided

S18: The first side of the fourth lens

S19: The second side of the fourth lens

S110: the first side of the fifth lens

S111: the second side of the fifth lens

S112: the first side of the sixth lens

S113: the second side of the sixth lens

S114: the first side of the seventh lens

S115: the second side of the seventh lens

S116: the first side of the eighth lens

S117: The second side of the eighth lens

S118: The first side of the filter

S119: The second side of the filter

S10: aperture surface

ST12: shading film

Claims (10)

An imaging lens, comprising: A first lens group, the first lens group has positive refractive power; a second lens group having positive refractive power; and a third lens group, the third lens group has positive refractive power; Wherein the first lens group, the second lens group and the third lens group are sequentially arranged along an optical axis from a first side to a second side. The imaging lens described in item 1 of the scope of the patent application, wherein: The first lens group includes a first lens, a second lens and a third lens, and the first lens, the second lens and the third lens are along the optical axis from the first side to the second side in order; The second lens group includes a fourth lens and a fifth lens, the fourth lens and the fifth lens are arranged in sequence along the optical axis from the first side to the second side; and The third lens group includes a sixth lens, a seventh lens and an eighth lens, and the sixth lens, the seventh lens and the eighth lens are along the optical axis from the first side to the second side in order. The imaging lens described in item 2 of the scope of the patent application, wherein: The first lens has negative refractive power; The second lens has positive refractive power; The third lens has negative refractive power; The fourth lens has positive refractive power; The fifth lens has positive refractive power; The sixth lens has negative refractive power; The seventh lens has positive refractive power; and The eighth lens has positive refractive power. The imaging lens described in item 3 of the scope of the patent application, wherein: The first lens is a meniscus lens and includes a convex surface facing the first side and a concave surface facing the second side; The second lens is a biconvex lens, and includes a convex surface facing the first side and another convex surface facing the second side; The third lens is a meniscus lens and includes a convex surface facing the first side and a concave surface facing the second side; The fourth lens is a meniscus lens and includes a concave surface facing the first side and a convex surface facing the second side; The fifth lens is a meniscus lens and includes a concave surface facing the first side and a convex surface facing the second side; The sixth lens is a meniscus lens and includes a concave surface facing the first side and a convex surface facing the second side; The seventh lens is a meniscus lens and includes a concave surface facing the first side and a convex surface facing the second side; and The eighth lens includes a convex surface facing the second side. In the imaging lens described in claim 4 of the scope of the present invention, the eighth lens is a biconvex lens, and further includes another convex surface facing the first side. In the imaging lens described in item 4 of the scope of the present invention, the eighth lens is a meniscus lens, and further includes a concave surface facing the first side. The imaging lens described in any one of claims 1 to 6 of the scope of the patent application, wherein the first lens group is fixed, the second lens group can move along the optical axis, and the third lens group can move Move along the optical axis to make the imaging lens zoom from a wide-angle end to a telephoto end to change the focal length. The imaging lens as described in any one of claims 1 to 6 of the scope of the patent application further includes an aperture disposed between the first side and the second side, and the imaging lens can zoom from a wide-angle end to A telephoto end to change the focal length, wherein the imaging lens satisfies at least one of the following conditions: 3<TTL/STD<5; 4<(f7+f8)/STD<12; 180mm ² <f7×f8<800mm ² ; 5<(f4+f5)/STD<8; 250mm ² <f4×f5<350mm ² ; 20mm ² <R51×R52<62mm ² ; 4.6<(EFLw+EFLt)/STD<7; Wherein, TTL is a distance between a first side surface of the first lens and an imaging surface along the optical axis, STD is an optical effective diameter of the aperture, f4 is an effective focal length of the fourth lens, and f5 is the One of the effective focal length of the fifth lens, f7 is one of the effective focal length of the seventh lens, f8 is one of the effective focal length of the eighth lens, R51 is one half of the curvature of the first side of the fifth lens R52 is a radius of curvature of a second side of the fifth lens, EFLw is an effective focal length of the imaging lens at the wide-angle end, and EFLt is an effective focal length of the imaging lens at the telephoto end. The imaging lens as described in any one of claims 1 to 6 of the scope of the patent application, wherein the imaging lens can be zoomed from a wide-angle end to a telephoto end to change the focal length, wherein the imaging lens is to At least one of the following conditions is met: 2.2<TTL/(G12w+G12t)<4.4; 7<TTL/(G23w+G23t)<20; 1<G12w/G23w<6; 3<G12t/G23t<9; 3<G12t-G12w<6; 9mm<EFLt-EFLw<13mm; Wherein, TTL is the distance between a first side surface of the first lens and an imaging surface along the optical axis, G12w is one of the first lens group to the second lens group along the optical axis at the wide-angle end G12t is the distance from the first lens group to the second lens group along the optical axis at the telephoto end, and G23w is the distance from the second lens group to the third lens group along the optical axis at the wide-angle end G23t is the distance between the second lens group and the third lens group along the optical axis at the telephoto end, EFLw is an effective focal length of the imaging lens at the wide-angle end, and EFLt is the imaging lens at the wide-angle end One of the effective focal lengths at the telephoto end. An image capture device, comprising: An imaging lens as described in any one of items 1 to 6 of the scope of the patent application; an image sensing element; an optical path turning element; and an actuator; Wherein the image sensing element is disposed between the third lens group and the second side; Wherein the optical path turning element is arranged between the first side and the first lens group; Wherein the actuator is arranged on one side of the imaging lens; Wherein the optical path turning element, the imaging lens and the image sensing element are sequentially arranged along the optical axis from the first side to the second side; Wherein the first lens group is fixed, the second lens group can be driven via the actuator to move along the optical axis towards the second side and the third lens group can be driven via the actuator along the optical axis moving toward the second side, so that the image capture device zooms from a wide-angle end to a telephoto end to change the focal length.

Images