Imaging lens and image capture device thereof

Abstract

An imaging lens and an image capturing device thereof. The imaging lens includes a first lens group, a second lens group and a third lens group. The first, second and third lens groups have positive refractive power. The first, second and third lens groups are arranged in order from a first side to a second side along an optical axis. The image capturing device includes the imaging lens, an image sensing assembly, a light path folding assembly and an actuator. The light path folding assembly, the imaging lens and the image sensing assembly are arranged in order from the first side to the second side along the optical axis. The actuator is disposed at a side of the imaging lens. The first lens group is fixed, the second lens group is movable along the optical axis by the actuator and the third lens group is movable along the optical axis by the actuator, so that the image capturing device is zoomed from a wide angle end to a telephoto end to change a focal length.

Description

TECHNICAL FIELD

[0001] The present application relates to an imaging lens and an image capturing device. BACKGROUND

[0002] The total track length of an optical zoom lens is usually long, and the total track length becomes longer as the zoom ratio is higher. Nowadays, the camera devices such as smart phones, tablets, mobile devices, etc. are required to be thin, and therefore, it is impossible to assemble a too long optical zoom lens. Therefore, there is a need for a new architecture of imaging lens which is small, high resolution and has optical zoom function, so as to meet the demand of optical zoom function of smart phones. SUMMARY

[0003] The present application provides an imaging lens and an image capturing device, which has a short total track length, high resolution, optical zoom function and good optical performance.

[0004] The present application provides an imaging lens including 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 arranged in order from a first side to a second side along an optical axis.

[0005] 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 order 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 order 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 order from the first side to the second side along the optical axis.

[0006] 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.

[0007] 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 double convex 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.

[0008] wherein the eighth lens is a double convex lens and can further include another convex surface facing the first side.

[0009] wherein the eighth lens is a meniscus lens and can further include a concave surface facing the first side.

[0010] wherein 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 is zoomed from a wide angle end to a telephoto end to change the focal length.

[0011] The imaging lens of the present application can further include an aperture disposed between the first side and the second side, the imaging lens is 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 x f8 < 800mm 2 ; 5 < (f4 + f5) / STD < 8; 250mm 2 < f4 x f5 < 350mm 2 ; 20mm 2 < R51 x R52 < 62mm 2 ; 4.6 < (EFLw + EFLt) / STD < 7; wherein, TTL is the distance along the optical axis from the first side of the first lens to the image plane, STD is the effective diameter of the aperture, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, R51 is the radius of curvature of the first side of the fifth lens, R52 is the radius of curvature of the second side of the fifth lens, EFLw is the effective focal length of the imaging lens at the wide angle end, and EFLt is the effective focal length of the imaging lens at the telephoto end.

[0012] Wherein the imaging lens can be zoomed from a wide-angle end to a telephoto end to change focal length, the imaging lens at least meets 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; wherein, TTL is the distance between the first side of the first lens and the imaging surface along the optical axis, 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 effective focal length of the imaging lens at the wide-angle end, and EFLt is the effective focal length of the imaging lens at the telephoto end.

[0013] The image capturing device of the present application comprises an imaging lens, an image sensing assembly, a light path turning assembly and an actuator. The image sensing assembly is disposed between the third lens group and the second side. The light path turning assembly is disposed between the first side and the first lens group. The actuator is disposed on one side of the imaging lens. The light path turning assembly, the imaging lens and the image sensing assembly 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 is driven by the actuator to move along the optical axis towards the second side, and the third lens group is driven by the actuator to move along the optical axis towards the second side, so that the image capturing device is zoomed from a wide-angle end to a telephoto end to change focal length.

[0014] The imaging lens and the image capturing device thereof according to the present application have the following advantages: the total length of the lens is short, the resolution is high, the optical zoom function is provided, and good optical performance is still maintained. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the above objectives, features and advantages of the present application more apparent, the following preferred embodiments are described in detail with reference to the accompanying drawings.

[0016] Figure 1 、 2 is the lens configuration and light path schematic diagram of the first embodiment of the imaging lens according to the present application at the wide-angle end and the telephoto end.

[0017] Figure 3A 、 3B , 3C is the field curvature diagram, the distortion diagram and the modulation transfer function diagram of the first embodiment of the imaging lens according to the present application at the wide-angle end.

[0018] Figure 4 、 5 is a lens configuration and optical path schematic of a second embodiment of an imaging lens according to the present disclosure at a wide angle end, a telephoto end.

[0019] Figure 6 、 7 is a lens configuration and optical path schematic of a third embodiment of an imaging lens according to the present disclosure at a wide angle end, a telephoto end.

[0020] Figure 8 is a schematic diagram of an embodiment of an image capture device according to the present disclosure. DETAILED DESCRIPTION

[0021] An imaging lens is provided, comprising: a first lens group having positive refractive power; a second lens group having positive refractive power; and a third lens group having 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.

[0022] An image capture device is provided, comprising: an imaging lens; an image sensing component; an optical path folding component; and an actuator; wherein the image sensing component is disposed between the third lens group and the second side; wherein the optical path folding component is disposed between the first side and the first lens group; wherein the actuator is disposed on a side of the imaging lens; wherein the optical path folding component, the imaging lens and the image sensing component are sequentially arranged along an optical axis from a first side to a second side; wherein the first lens group is fixed, the second lens group is movable along the optical axis towards the second side by the actuator, and the third lens group is movable along the optical axis towards the second side by the actuator, so that the image capture device is zoomed from a wide angle end to a telephoto end to change focal length.

[0023] The imaging lens of the present invention has a variable focal length. Each embodiment of the imaging lens zooms from the wide-angle end to the telephoto end, with a zoom ratio of approximately 2x. When configured together with another fixed-focus wide-angle lens in a mobile phone, tablet or other camera device, the effective focal length of the imaging lens of the present invention has a zoom ratio of, for example, 4x to 8x 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, its effective focal length at the wide-angle end is 15.082mm, and its 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), which is approximately 2 times. When it is configured together with a fixed-focus wide-angle lens with an effective focal length of 3.40mm in a mobile phone, tablet, or other camera device, based on the effective focal length of the fixed-focus wide-angle lens, the imaging lens of the present invention will have a zoom ratio of 4 (15.082mm / 3.40mm=4.44≈4) to 8 (25.629mm / 3.40mm=7.54≈8) times relative to the fixed-focus wide-angle lens with an effective focal length of 3.40mm. However, the present invention is not limited to this. When configured together with another fixed-focus wide-angle lens in a camera device, it can have a higher zoom ratio, such as 10 times or more.

[0024] Please refer to Tables 1, 2, 4, 5, 7 and 8 below. Tables 1, 4 and 7 are the relevant parameter tables for each lens of the imaging lens according to the first to third embodiments of the present invention. Tables 2, 5 and 8 are the relevant parameter tables for the aspherical surface of the aspherical lens in Tables 1, 4 and 7.

[0025] Figure 1 , 4 Figures 6 and 7 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. Figure 2 , 5 Figures 7 and 8 are schematic diagrams of the lens configuration and optical path at the telescope of the first, second, and third embodiments of the imaging lens of the present invention, respectively. The first lens group LG11, LG21, and LG31 have positive refractive power and respectively include the first lens L11, L21, L31, the second lens L12, L22, L32, and the third lens L13, L23, L33. The second lens group LG12, LG22, and LG32 have positive refractive power and respectively include the fourth lens L14, L24, L34, and the fifth lens L15, L25, L35. The third lens group LG13, LG23, and LG33 have positive refractive power and respectively include the sixth lens L16, L26, L36, the seventh lens L17, L27, L37, and the eighth lens L18, L28, L38.

[0026] The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power, made of glass. Their first side surfaces S11, S21, and S31 are convex, and their second side surfaces S12, S22, and S32 are concave. All three side surfaces S11, S21, and S31, and S12, S22, and S32 are aspherical surfaces. The second lenses L12, L22, and L32 are biconvex lenses with positive refractive power, made of glass. Their first side surfaces S13, S23, and S33 are convex, and their second side surfaces S14, S24, and S34 are convex. All three side surfaces S13, S23, and S33, and S14, S24, and S34 are aspherical surfaces. The third lenses, L13, L23, and L33, are meniscus lenses with negative refractive power, made of glass. Their first sides, S15, S25, and S35, are convex, and their second sides, S16, S26, and S36, are concave. All three sides, S15, S25, and S35 and S16, S26, and S36, are aspherical surfaces. The fourth lenses, L14, L24, and L34, are meniscus lenses with positive refractive power, made of plastic. Their first sides, S18, S28, and S38, are concave, and their second sides, S19, S29, and S39, are convex. All three sides, S18, S28, and S38 and S19, S29, and S39, are aspherical surfaces. The fifth lenses, L15, L25, and L35, are meniscus lenses with positive refractive power, made of plastic. Their first side surfaces, S110, S210, and S310, are concave, and their second side surfaces, S111, S211, and S311, are convex. All three sides, S110, S210, and S310, and S111, S211, and S311, are aspherical surfaces. The sixth lenses, L16, L26, and L36, are meniscus lenses with negative refractive power, made of plastic. Their first side surfaces, S112, S212, and S312, are concave, and their second side surfaces, S113, S213, and S313, are convex. All three sides, S112, S212, and S312, and S113, S213, and S313, are aspherical surfaces. The seventh lenses, L17, L27, and L37, are meniscus lenses with positive refractive power, made of plastic. Their first side surfaces, S114, S214, and S314, are concave, and their second side surfaces, S115, S215, and S315, are convex. All three sides (S114, S214, S314 and S115, S215, S315) are aspherical surfaces. The eighth lenses, L18, L28, and L38, also have positive refractive power and are made of plastic. Their second side surfaces, S117, S217, and S317, are convex, and all three sides (S116, S216, S316 and S117, S217, S317) are aspherical surfaces.

[0027] In addition, imaging lenses 1, 2, and 3 must satisfy at least one of the following conditions (1) to (13):

[0028] 3<TTL / STD<5; (1)

[0029] 4<(f7+f8) / STD<12; (2)

[0030] 180mm 2 <f7×f8<800mm 2 ; (3)

[0031] 5<(f4+f5) / STD<8; (4)

[0032] 250mm 2 <f4×f5<350mm 2 ; (5)

[0033] 20mm 2 <R51×R52<62mm 2 ; (6)

[0034] 4.6<(EFLw+EFLt) / STD<7; (7)

[0035] 2.2<TTL / (G12w+G12t)<4.4; (8)

[0036] 7<TTL / (G23w+G23t)<20; (9)

[0037] 1<G12w / G23w<6; (10)

[0038] 3<G12t / G23t<9; (11)

[0039] 3<G12t-G12w<6; (12)

[0040] 9mm<EFLt-EFLw<13mm; (13)

[0041] Wherein, TTL represents the distance from the first side surfaces S11, S21, S31 of the first lenses L11, L21, L31 to the imaging planes IMA1, IMA2, IMA3 along the optical axes OA1, OA2, OA3 in the first to third embodiments; STD represents the effective optical diameter of the apertures ST11, ST21, ST31 in the first to third embodiments; f4 represents the effective focal length of the fourth lenses L14, L24, L34 in the first to third embodiments; and f5 represents the effective focal length of the fifth lenses L15, L25 in the first to third embodiments. The effective focal length of L35, f7 is the effective focal length of the seventh lenses L17, L27, and L37 in the first to third embodiments, f8 is the effective focal length of the eighth lenses L18, L28, and L38 in the first to third embodiments, R51 is the radius of curvature of the first side surfaces S110, S210, and S310 of the fifth lenses L15, L25, and L35 in the first to third embodiments, and R52 is the radius of curvature of the second side surfaces S111, S211, and S311 of the fifth lenses L15, L25, and L35 in the first to third embodiments. EFLw is the effective focal length of imaging lenses 1, 2, and 3 at the wide-angle end in the first to third embodiments; EFLt is the effective focal length of imaging lenses 1, 2, and 3 at the telephoto end in the first to third embodiments; G12w is the distance along the optical axis OA1, OA2, and OA3 from the first lens group LG11, LG21, and LG31 to the second lens group LG12, LG22, and LG32 at the wide-angle end in the first to third embodiments; G12t is the distance between the first lens group LG11, LG21, and LG31 and the second lens group LG12, LG22, and LG32 in the first to third embodiments. The spacing between LG12, LG22, and LG32 along the optical axes OA1, OA2, and OA3 at the telephoto end is defined as follows: G23w represents the spacing between the second lens group LG12, LG22, and LG32 and the third lens group LG13, LG23, and LG33 along the optical axes OA1, OA2, and OA3 at the wide-angle end in the first to third embodiments; G23t represents the spacing between the second lens group LG12, LG22, and LG32 and the third lens group LG13, LG23, and LG33 along the optical axes OA1, OA2, and OA3 at the telephoto end in the first to third embodiments. This allows imaging lenses 1, 2, and 3 to effectively shorten the overall lens length, effectively improve resolution, effectively correct aberrations, effectively correct chromatic aberration, and achieve optical zoom functionality.

[0042] The first embodiment of the imaging lens of the present invention will now be described in detail. Please also refer to... Figure 1 and Figure 2The imaging lens 1, along the optical axis OA1 from the first side to the second side, includes an aperture ST11, a first lens group LG11, a light shield ST12, a second lens group LG12, a third lens group LG13, and a filter OF1. The first lens group LG11, along the optical axis OA1 from the first side to the second side, includes a first lens L11, a second lens L12, and a third lens L13. The second lens group LG12, along the optical axis OA1 from the first side to the second side, includes a fourth lens L14 and a fifth lens L15. The third lens group LG13, along the optical axis OA1 from the first side to the second side, includes a sixth lens L16, a seventh lens L17, and an eighth lens L18. During imaging, light rays from the first side are finally imaged onto the imaging plane IMA1.

[0043] Imaging lens 1 consists of a wide-angle end (such as...) Figure 1 (As shown) Zoom to remote distance (e.g.) Figure 2 When (as shown), the first lens group LG11 is fixed, the second lens group LG12 moves along the optical axis OA1 to the second side, and the third lens group LG13 moves along the optical axis OA1 to the second side, thereby increasing the distance between the first lens group LG11 and the second lens group LG12, and increasing the distance between the second lens group LG12 and the third lens group LG13. The imaging lens 1 of the first embodiment starts from the wide-angle end (e.g., Figure 1 (As shown) Zoom to remote distance (e.g.) Figure 2 When the zoom ratio is approximately 1.70 (25.629mm / 15.082mm≈1.70), it is shown in the figure.

[0044] According to paragraphs 1 to 6 of the "Specific Implementation Method", the eighth lens L18 is a biconvex lens, and its first side surface S116 is a convex surface; the filter OF1 has a first side surface S118 and a second side surface S119 that are both flat; by using the above-mentioned lens, aperture ST11, light shield ST12 and at least satisfying one of the conditions (1) to (13), the imaging lens 1 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, effectively correct chromatic aberrations and realize optical zoom function.

[0045] Table 1 is... Figure 1 , Figure 2 The relevant parameter table of each lens of the imaging lens 1 at the wide-angle end and the telephoto end.

[0046] Table 1

[0047]

[0048] The aspherical surface concavity z of the aspherical 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: perpendicular distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspherical coefficients.

[0049] Table 2 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 1, where k is the conic constant and A to G are the aspherical coefficients.

[0050] Table 2

[0051]

[0052] Table 3 shows the relevant parameter values ​​of the imaging lens 1 in the first embodiment and the calculated values ​​of the corresponding conditions (1) to (13). As can be seen from Table 3, the imaging lens 1 in the first embodiment can meet the requirements of conditions (1) to (13).

[0053] Table 3

[0054]

[0055] Furthermore, the optical performance of the imaging lens 1 in the first embodiment also meets the requirements. Figure 3A It can be seen that the field curvature of the imaging lens 1 in the first embodiment is between -0.6mm and 0.1mm at the wide-angle end. Figure 3B It can be seen that the distortion of the imaging lens 1 in the first embodiment is between 0% and 1.2% at the wide-angle end. Figure 3C It can be seen that the modulation conversion function value of the imaging lens 1 in the first embodiment is between 0.58 and 1.0 at the wide-angle end. It is evident that the field curvature and distortion of the imaging lens 1 in the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

[0056] The second embodiment of the imaging lens of the present invention will now be described in detail. Please also refer to... Figure 4 and Figure 5Imaging lens 2, along the optical axis OA2 from the first side to the second side, includes an aperture ST21, a first lens group LG21, a light shield ST22, a second lens group LG22, a third lens group LG23, and a filter OF2. The first lens group LG21, along the optical axis OA2 from the first side to the second side, includes a first lens L21, a second lens L22, and a third lens L23. The second lens group LG22, along the optical axis OA2 from the first side to the second side, includes a fourth lens L24 and a fifth lens L25. The third lens group LG23, along the optical axis OA2 from the first side to the second side, includes a sixth lens L26, a seventh lens L27, and an eighth lens L28. During imaging, light rays from the first side are finally imaged onto the imaging plane IMA2.

[0057] Imaging lens 2 consists of a wide-angle end (such as...) Figure 4 (As shown) Zoom to remote distance (e.g.) Figure 5 When (as shown), the first lens group LG21 is fixed, the second lens group LG22 moves along the optical axis OA2 to the second side, and the third lens group LG23 moves along the optical axis OA2 to the second side, thereby increasing the distance between the first lens group LG21 and the second lens group LG22, and increasing the distance between the second lens group LG22 and the third lens group LG23. The imaging lens 2 of the second embodiment starts from the wide-angle end (e.g., Figure 4 (As shown) Zoom to remote distance (e.g.) Figure 5 When the zoom ratio is approximately 1.97 (25.788mm / 13.100mm≈1.97), it is shown in the figure.

[0058] According to paragraphs 1 to 6 of the "Specific Implementation Method", the eighth lens L28 is a biconvex lens with its first side surface S216 being convex; the filter OF2 has its first side surface S218 and second side surface S219 both being planar; by utilizing the above-mentioned lens, aperture ST21, light shield ST22 and at least satisfying one of the conditions (1) to (13), the imaging lens 2 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, effectively correct chromatic aberrations and realize optical zoom function.

[0059] Table 4 is... Figure 4 , Figure 5 The relevant parameter table of each lens of the imaging lens 2 at the wide-angle end and the telephoto end.

[0060] Table 4

[0061]

[0062]

[0063] The definition of the aspherical surface concavity z of the aspherical lens in Table 4 is the same as the definition of the aspherical surface concavity z of the aspherical lens in Table 1 of the first embodiment, and will not be repeated here. Table 5 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 4.

[0064] Table 5

[0065]

[0066] Table 6 shows the relevant parameter values ​​of the imaging lens 2 in the second embodiment and the calculated values ​​of the corresponding conditions (1) to (13). As can be seen from Table 6, the imaging lens 2 in the second embodiment can meet the requirements of conditions (1) to (13).

[0067] Table 6

[0068]

[0069] In addition, the field curvature (illustration omitted) and distortion (illustration omitted) of the imaging lens 2 in the second embodiment can also be effectively corrected, and the image resolution can meet the requirements, thereby obtaining better optical performance.

[0070] The third embodiment of the imaging lens of the present invention will now be described in detail. Please also refer to... Figure 6 and Figure 7 The imaging lens 3, along the optical axis OA3 from the first side to the second side, includes an aperture ST31, a first lens group LG31, a light shield ST32, a second lens group LG32, a third lens group LG33, and a filter OF3. The first lens group LG31, along the optical axis OA3 from the first side to the second side, includes a first lens L31, a second lens L32, and a third lens L33. The second lens group LG32, along the optical axis OA3 from the first side to the second side, includes a fourth lens L34 and a fifth lens L35. The third lens group LG33, along the optical axis OA3 from the first side to the second side, includes a sixth lens L36, a seventh lens L37, and an eighth lens L38. During imaging, light rays from the first side are finally imaged onto the imaging plane IMA3.

[0071] Imaging lens 3 consists of a wide-angle end (such as...) Figure 6 (As shown) Zoom to remote distance (e.g.) Figure 7 When (as shown), the first lens group LG31 is fixed, the second lens group LG32 moves along the optical axis OA3 to the second side, and the third lens group LG33 moves along the optical axis OA3 to the second side, thereby increasing the distance between the first lens group LG31 and the second lens group LG32, and increasing the distance between the second lens group LG32 and the third lens group LG33. The imaging lens 3 of the third embodiment starts from the wide-angle end (e.g., Figure 6 (As shown) Zoom to remote distance (e.g.) Figure 7When the zoom ratio is approximately 1.82 (25.634mm / 14.074mm≈1.82), it is as shown in the figure.

[0072] According to paragraphs 1 to 6 of the [Specific Implementation], the eighth lens L38 is a meniscus lens with its first side surface S316 being concave; the filter OF3 has its first side surface S318 and second side surface S319 both being planar; by utilizing the above-mentioned lens, aperture ST31, light shield ST32 and at least satisfying one of the conditions (1) to (13), the imaging lens 3 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, effectively correct chromatic aberrations and realize optical zoom function.

[0073] Table 7 is... Figure 6 , Figure 7 The relevant parameter tables for each lens of the imaging lens 3 at the wide-angle end and the telephoto end are shown.

[0074] Table 7

[0075]

[0076] The definition of the aspherical surface concavity z of the aspherical lens in Table 7 is the same as the definition of the aspherical surface concavity z of the aspherical lens in Table 1 of the first embodiment, and will not be repeated here. Table 8 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 7.

[0077] Table 8

[0078]

[0079] Table 9 shows the relevant parameter values ​​of the imaging lens 3 in the third embodiment and the calculated values ​​of the corresponding conditions (1) to (13). As can be seen from Table 9, the imaging lens 3 in the third embodiment can meet the requirements of conditions (1) to (13).

[0080] Table 9

[0081]

[0082] In addition, the field curvature (illustration omitted) and distortion (illustration omitted) of the imaging lens 3 in the third embodiment can also be effectively corrected, and the image resolution can meet the requirements, thereby obtaining better optical performance.

[0083] An embodiment of the image capture device of the present invention will now be described in detail. Please refer to [link to relevant documentation]. Figure 8The image capture device 100 includes an optical path deflection assembly P1, an imaging lens 4, an image sensing assembly ISE1, and an actuator ACT1. The imaging lens 4, along the optical axis OA4, sequentially includes a first lens group LG41, a second lens group LG42, and a third lens group LG43 from the first side to the second side. The optical path deflection assembly P1 is disposed between the first side and the first lens group LG41. The image sensing assembly 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 deflection assembly P1, the imaging lens 4, and the image sensing assembly ISE1 are arranged sequentially along the optical axis OA4 from the first side to the second side. During imaging, light from the subject (not shown) first enters the optical path deflection assembly P1, which deflects the incident light by 90 degrees before entering the imaging lens 4. The imaging lens 4 then images the subject (not shown) onto the image sensing assembly ISE1. Actuator ACT1 can drive the second lens group LG42 and the third lens group LG43, causing the second lens group LG42 and the third lens group LG43 to move along the optical axis OA4 toward the second side, thereby changing the focal length of the imaging lens 4 from the wide-angle end to the telephoto end. In other words, when the imaging lens 4 zooms from the wide-angle end to the telephoto end, the first lens group LG41 remains stationary, while the second lens group LG42 and the third lens group LG43 move along the optical axis OA4 toward the second side. In this embodiment, actuator ACT1 can be a drive component that uses a magnet and a coil to generate magnetic force by energizing the coil, but it is not limited to this. Actuator ACT1 can also be a voice coil motor, a stepper motor, a piezoelectric material actuator, or a shape memory alloy (SMA) actuator, etc.

[0084] The aforementioned optical path deflection component P1 is a prism, but it can also be replaced with a reflector, which should also fall within the scope of this invention.

[0085] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An imaging lens, characterized in that, The number of lens groups thereof is three, comprising: a first lens group having positive refractive power, the first lens group comprising a first lens, a second lens and a third lens, the first lens, the second lens and the third lens being arranged in order from the first side to the second side along the optical axis; a second lens group having positive refractive power, the second lens group comprising a fourth lens and a fifth lens, the fourth lens and the fifth lens being arranged in order from the first side to the second side along the optical axis, wherein the fourth lens has positive refractive power; and a third lens group having positive refractive power, the third lens group comprising a sixth lens, a seventh lens and an eighth lens, the sixth lens, the seventh lens and the eighth lens being arranged in order from the first side to the second side along the optical axis; wherein the first lens group, the second lens group and the third lens group are arranged in order from the first side to the second side along the optical axis.

2. The imaging lens of claim 1, wherein: the first lens has negative refractive power; the second lens has positive refractive power; the third lens has negative 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.

3. The imaging lens of claim 2, wherein: the first lens is a meniscus lens comprising a convex surface facing the first side and a concave surface facing the second side; the second lens is a biconvex lens comprising a convex surface facing the first side and another convex surface facing the second side; the third lens is a meniscus lens comprising a convex surface facing the first side and a concave surface facing the second side; the fourth lens is a meniscus lens comprising a concave surface facing the first side and a convex surface facing the second side; the fifth lens is a meniscus lens comprising a concave surface facing the first side and a convex surface facing the second side; the sixth lens is a meniscus lens comprising a concave surface facing the first side and a convex surface facing the second side; the seventh lens is a meniscus lens comprising a concave surface facing the first side and a convex surface facing the second side; and the eighth lens comprises a convex surface facing the second side.

4. The imaging lens of claim 3, wherein, the eighth lens is a biconvex lens further comprising another convex surface facing the first side.

5. The imaging lens of claim 3, wherein, the eighth lens is a meniscus lens further comprising a concave surface facing the first side.

6. The imaging lens according to any one of claims 1 to 5, wherein, 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 is zoomed from a wide angle end to a telephoto end to change focal length.

7. The imaging lens according to any one of claims 1 to 5, wherein, a stop is further disposed between the first side and the second side, the imaging lens is zoomed from a wide angle end to a telephoto end to change 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 x f8 < 800mm 2 ; 5 < (f4 + f5) / STD < 8; 250 mm 2 < f4xf5 < 350 mm 2 ; 20mm 2 < R51x R52< 62mm 2 ; 4.6 < (EFLw + EFLt) / STD < 7; wherein TTL is the distance from the first side of the first lens to the image plane along the optical axis, STD is the optical effective diameter of the aperture, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, R51 is the radius of curvature of the first side of the fifth lens, R52 is the radius of curvature of the second side of the fifth lens, EFLw is the effective focal length of the imaging lens at the wide-angle end, and EFLt is the effective focal length of the imaging lens at the telephoto end.

8. The imaging lens of any one of claims 1 to 5, wherein, The imaging lens can be zoomed from a wide-angle end to a telephoto end to change focal length, wherein the imaging lens at least satisfies 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; 9 mm < EFLt-EFLw < 13 mm; wherein TTL is the distance from the first side of the first lens to the image plane along the optical axis, G12w is the distance from 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, 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 from the second lens group to the third lens group along the optical axis at the telephoto end, EFLw is the effective focal length of the imaging lens at the wide-angle end, and EFLt is the effective focal length of the imaging lens at the telephoto end.

9. An image capture device, comprising: comprising: the imaging lens of any one of claims 1-8; an image sensing component; a light path folding component; and an actuator; wherein the image sensing component is disposed between the third lens group and the second side; wherein the light path folding component is disposed between the first side and the first lens group; wherein the actuator is disposed on a side of the imaging lens; wherein the light path folding component, the imaging lens, and the image sensing component 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 is movable along the optical axis toward the second side by the actuator, and the third lens group is movable along the optical axis toward the second side by the actuator, so that the image capturing device is zoomed from a wide-angle end to a telephoto end to change focal length. comprising:

10. An imaging lens characterized by comprising, in order from the object, a first lens group having positive refractive power, the first lens group including a first lens, a second lens, and a third lens; a second lens group having positive refractive power, the second lens group including a fourth lens and a fifth lens; and a third lens group having positive refractive power, the third lens group including a sixth lens, a seventh lens, and an eighth lens; 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 further includes a stop disposed between the first side and the second side, the imaging lens being zoomable from a wide-angle end to a telephoto end to vary a 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 x f8 < 800mm 2 ; 5 < (f4+f5) / STD < 8; 250 mm 2 < f4xf5 < 350 mm 2 ; 20mm 2 < R51x R52< 62mm 2 ; 4.6 < (EFLw+EFLt) / STD < 7; wherein TTL is a distance along the optical axis from a first side of the first lens to an image plane, STD is an effective diameter of the stop, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, f7 is an effective focal length of the seventh lens, f8 is an effective focal length of the eighth lens, R51 is a radius of curvature of a 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.

11. An imaging lens characterized by comprising, in order from the object, comprises: a first lens group having positive refractive power, the first lens group including a first lens; a second lens group having positive refractive power; and a third lens group having positive refractive power; wherein the first lens group, the second lens group, and the third lens group are arranged in order along an optical axis from a first side to a second side, the imaging lens being zoomable from a wide-angle end to a telephoto end to vary a focal length, wherein the imaging lens at least satisfies 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; 9 mm < EFLt-EFLw < 13 mm; wherein TTL is a distance along the optical axis from a first side of the first lens to an image plane, G12w is a distance along the optical axis from the first lens group to the second lens group at the wide-angle end, G12t is a distance along the optical axis from the first lens group to the second lens group at the telephoto end, G23w is a distance along the optical axis from the second lens group to the third lens group at the wide-angle end, G23t is a distance along the optical axis from the second lens group to the third lens group at the telephoto end, 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.

Images