CN110554481B

CN110554481B - Image lens and image capturing device

Info

Publication number: CN110554481B
Application number: CN201910883820.2A
Authority: CN
Inventors: 薛钧哲; 陈纬彧
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2016-08-26
Filing date: 2016-08-26
Publication date: 2021-09-28
Anticipated expiration: 2036-08-26
Also published as: CN110554481A; CN110568589A; CN107783251A; CN110568589B; CN107783251B

Abstract

The invention discloses an image lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side. The first lens element has negative refractive power. The third lens element with positive refractive power. The fourth lens element with positive refractive power. The fifth lens element with negative refractive power has a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface thereof are aspheric. The sixth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface has at least one inflection point at an off-axis region, and both the object-side surface and the image-side surface are aspheric. The total number of lenses of the image lens is six. When specific conditions are met, the image lens can meet the requirements of large visual angle, high imaging quality and miniaturization.

Description

Image lens and image capturing device

The application is a divisional application, and the application date of the original application is as follows: 2016, 8 months, 26 days; the application numbers are: 201610728907.9, respectively; the invention has the name: an image lens, an image capturing device and an electronic device.

Technical Field

The present invention relates to an image lens, an image capturing device and an electronic apparatus, and more particularly, to an image lens and an image capturing device suitable for an electronic apparatus.

Background

In recent years, with the rapid development of miniaturized camera lenses, the demand of micro image capture modules is increasing, and with the advancement of semiconductor process technology, the pixel size of the photosensitive element is reduced, and nowadays, electronic products are developed with a good function, a light weight, a small size and a light weight. Therefore, a small-sized photographing lens with good imaging quality is apparently the mainstream in the market.

With the increasing application of the camera module, it is a trend of future technology development to install the camera module in various intelligent electronic products, vehicle devices, identification systems, entertainment devices, sports devices, and home intelligent auxiliary systems. In order to have a wider experience of use, an intelligent device equipped with one or more lenses having different viewing angles is becoming the mainstream of the market. In order to meet different application requirements, image lenses with different characteristics are developed, and the requirements of optical systems with large viewing angles are increased, and the requirements on specifications are also increased. However, the conventional image lens is difficult to be mounted on a relatively thin and light electronic device because of its requirements of large viewing angle and short overall length. Therefore, developing an image lens that can satisfy the requirements of large viewing angle, high imaging quality and miniaturization is one of the problems to be solved in the industry.

Disclosure of Invention

The invention aims to provide an image lens and an image capturing device. The first lens element with negative refractive power is helpful for making light with a larger viewing angle enter the image lens. The third lens element and the fourth lens element both have positive refractive power, and the fifth lens element has negative refractive power, which helps to focus light on an image plane and simultaneously achieve the requirements of short back focus and miniaturization. When a specific condition is satisfied, a sufficient space is ensured between the fifth lens and the sixth lens, and the problem of manufacturing or assembling caused by too small peripheral distance can be avoided. In summary, the image lens disclosed in the present invention can satisfy the requirements of large viewing angle, high imaging quality and miniaturization.

The invention provides an image lens which sequentially comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element from an object side to an image side. The first lens element has negative refractive power. The third lens element with positive refractive power. The fourth lens element with positive refractive power. The fifth lens element with negative refractive power has a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface thereof are aspheric. The sixth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface has at least one inflection point at an off-axis region, and both the object-side surface and the image-side surface are aspheric. The total number of lenses of the image lens is six. The distance between the fifth lens element and the sixth lens element along the optical axis is T56, the thickness of the sixth lens element along the optical axis is CT6, the abbe number of the fourth lens element is V4, the abbe number of the fifth lens element is V5, the abbe number of the sixth lens element is V6, the distance between the object-side surface of the first lens element and the image plane along the optical axis is TL, and the maximum imaging height of the imaging lens is ImgH, which satisfies the following conditions:

1.05＜T56/CT6＜7.50；

0.30< (V5+ V6)/V4< 1.0; and

1.0＜TL/ImgH＜2.30。

the present invention further provides an image lens assembly, which includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The third lens element with positive refractive power. The fourth lens element with positive refractive power. The fifth lens element with negative refractive power has a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface thereof are aspheric. The sixth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface has at least one inflection point at an off-axis region, and both the object-side surface and the image-side surface are aspheric. The total number of lenses of the image lens is six. The axial distance between the fifth lens element and the sixth lens element is T56, the axial thickness of the sixth lens element is CT6, the focal length of the imaging lens assembly is f, the radius of curvature of the image-side surface of the sixth lens element is R12, the axial distance between the object-side surface of the first lens element and the image plane is TL, and the maximum imaging height of the imaging lens assembly is ImgH, which satisfies the following conditions:

1.05＜T56/CT6＜7.50；

r12/f is more than 0.20 and less than 1.25; and

1.0＜TL/ImgH＜2.30。

the present invention further provides an image lens assembly, which includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The third lens element with positive refractive power. The fourth lens element with positive refractive power. The fifth lens element with negative refractive power has a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface thereof are aspheric. The sixth lens element with negative refractive power has a concave image-side surface at a paraxial region, and the image-side surface of the sixth lens element has at least one inflection point at an off-axis region, wherein the object-side surface and the image-side surface of the sixth lens element are aspheric. The total number of lenses of the image lens is six. An axial distance between the fifth lens element and the sixth lens element is T56, an axial thickness of the sixth lens element is CT6, an axial distance between the object-side surface of the first lens element and the image plane is TL, and a maximum image height of the imaging lens system is ImgH, which satisfies the following conditions:

T56/CT6 is more than 1.05 and less than 7.50; and

1.0＜TL/ImgH＜2.30。

the invention provides an image capturing device, which comprises any one of the image lens and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on an imaging surface of the image lens.

When the T56/CT6 satisfies the above condition, a sufficient space is ensured between the fifth lens and the sixth lens, and the problem of manufacturing or assembling caused by too small peripheral distance can be avoided.

When (V5+ V6)/V4 satisfy the above conditions, a better balance between astigmatism and chromatic aberration correction can be obtained, which also helps to reduce the effective radius of the sixth lens element and maintain the miniaturization of the image lens.

When TL/ImgH satisfies the above condition, it is advantageous to keep the size of the video lens small, and it is more suitable for being mounted on a light and thin electronic device.

When the R12/f satisfies the above condition, it is helpful to move the principal point of the image lens to the object, shorten the back focal length and further miniaturize the volume and the total length of the image lens.

Drawings

Fig. 1 is a schematic view illustrating an image capturing apparatus according to a first embodiment of the invention.

Fig. 2 is a graph of spherical aberration, astigmatism and distortion in the first embodiment from left to right.

Fig. 3 is a schematic view of an image capturing apparatus according to a second embodiment of the invention.

Fig. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment, from left to right.

Fig. 5 is a schematic view illustrating an image capturing apparatus according to a third embodiment of the invention.

Fig. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment from left to right.

Fig. 7 is a schematic view of an image capturing apparatus according to a fourth embodiment of the invention.

Fig. 8 is a graph of spherical aberration, astigmatism and distortion of the fourth embodiment, from left to right.

Fig. 9 is a schematic view illustrating an image capturing apparatus according to a fifth embodiment of the invention.

Fig. 10 is a graph of spherical aberration, astigmatism and distortion in the fifth embodiment from left to right.

Fig. 11 is a schematic view of an image capturing apparatus according to a sixth embodiment of the invention.

Fig. 12 is a graph showing the spherical aberration, astigmatism and distortion of the sixth embodiment in order from left to right.

Fig. 13 is a schematic view illustrating an image capturing apparatus according to a seventh embodiment of the invention.

Fig. 14 is a graph showing the spherical aberration, astigmatism and distortion in order from left to right in the seventh embodiment.

FIG. 15 is a diagram illustrating parameters SD11 and SD62 according to the first embodiment of the invention.

FIG. 16 is a schematic diagram showing the parameters Sag21 and Sag22 according to the first embodiment of the present invention.

Fig. 17 is a schematic view illustrating an electronic device according to the present invention.

FIG. 18 is a schematic diagram of another electronic device according to the present invention.

FIG. 19 is a schematic diagram of another electronic device according to the present invention.

Wherein, the reference numbers:

an image taking device: 10

Aperture: 100. 200, 300, 400, 500, 600, 700

Diaphragm: 301. 401, 501

A first lens: 110. 210, 310, 410, 510, 610, 710

An object-side surface: 111. 211, 311, 411, 511, 611, 711

Image-side surface: 112. 212, 312, 412, 512, 612, 712

A second lens: 120. 220, 320, 420, 520, 620, 720

An object-side surface: 121. 221, 321, 421, 521, 621, 721

Image-side surface: 122. 222, 322, 422, 522, 622, 722

A third lens: 130. 230, 330, 430, 530, 630, 730

An object-side surface: 131. 231, 331, 431, 531, 631, 731

Image-side surface: 132. 232, 332, 432, 532, 632, 732

A fourth lens: 140. 240, 340, 440, 540, 640, 740

An object-side surface: 141. 241, 341, 441, 541, 641, 741

Image-side surface: 142. 242, 342, 442, 542, 642, 742

A fifth lens: 150. 250, 350, 450, 550, 650, 750

An object-side surface: 151. 251, 351, 451, 551, 651, 751

Image-side surface: 152. 252, 352, 452, 552, 652, 752

A sixth lens: 160. 260, 360, 460, 560, 660, 760

An object-side surface: 161. 261, 361, 461, 561, 661, 761

Image-side surface: 162. 262, 362, 462, 562, 662, 762

Infrared ray filtering filter element: 170. 270, 370, 470, 570, 670, 770

Imaging surface: 180. 280, 380, 480, 580, 680, 780

An electron-sensitive element: 190. 290, 390, 490, 590, 690, 790

CT 2: thickness of the second lens on the optical axis

CT 6: thickness of the sixth lens element on the optical axis

CTmax: maximum value of thickness of each lens on optical axis in image lens

EPD: entrance pupil diameter of image lens

f: focal length of image lens

f 1: focal length of the first lens

f 2: focal length of the second lens

f 3: focal length of the third lens

f 4: focal length of the fourth lens

f 5: focal length of fifth lens

f 6: focal length of sixth lens

fx: focal length of the x-th lens

Fno: aperture value of image lens

FOV: maximum viewing angle in image lens

HFOV: half of maximum visual angle in image lens

ImgH: maximum imaging height of image lens

R1: radius of curvature of object-side surface of first lens

R2: radius of curvature of image-side surface of first lens

R3: radius of curvature of object-side surface of second lens

R4: radius of curvature of image-side surface of second lens

R5: radius of curvature of object-side surface of third lens

R6: radius of curvature of image-side surface of the third lens

R9: radius of curvature of object-side surface of fifth lens

R10: radius of curvature of image-side surface of fifth lens

R11: radius of curvature of object-side surface of sixth lens element

R12: radius of curvature of image-side surface of sixth lens element

Sag 21: the horizontal displacement between the intersection point of the object-side surface of the second lens and the maximum effective radius of the object-side surface of the second lens

Sag 22: the horizontal displacement from the intersection point of the image side surface of the second lens on the optical axis to the maximum effective radius position of the image side surface of the second lens on the optical axis

SD 11: maximum effective radius of object-side surface of the first lens

SD 62: maximum effective radius of image-side surface of sixth lens

T23: the distance between the second lens and the third lens on the optical axis

T34: the distance between the third lens and the fourth lens on the optical axis

T45: the distance between the fourth lens and the fifth lens on the optical axis

T56: the distance between the fifth lens and the sixth lens on the optical axis

TL: the distance from the object side surface of the first lens element to the image plane on the optical axis

V4: abbe number of fourth lens

V5: abbe number of fifth lens

V6: abbe number of sixth lens

Σ AT: sum of distances between two adjacent lenses in the image lens on the optical axis

Detailed Description

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

The image lens includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The total number of lenses of the image lens is six.

The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may have an air space on an optical axis between two adjacent lenses, that is, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may be six single non-bonded lenses. Because the process of bonding the lens is more complicated than that of non-bonding lens, especially the bonding surface of the two lenses needs to have a curved surface with high accuracy, so as to achieve high tightness when the two lenses are bonded, and in the bonding process, the shift defect caused by deviation is more likely to affect the whole optical imaging quality. Therefore, the first lens to the sixth lens can be six single non-bonded lenses, so that the problems caused by the bonded lenses can be effectively avoided, the assembly of the lenses is facilitated, and the manufacturing yield is improved.

The first lens element with negative refractive power has an object-side surface that is concave at a paraxial region and has at least one convex surface at an off-axis region. Therefore, the light with a larger visual angle can enter the image lens.

The third lens element with positive refractive power. Therefore, the aberration generated by the first lens can be corrected.

The fourth lens element with positive refractive power. Therefore, the arrangement of the refractive power of the image lens is balanced to reduce the sensitivity.

The fifth lens element with negative refractive power has a concave image-side surface at a paraxial region. Therefore, the refractive power configuration of the third lens element, the fourth lens element and the fifth lens element is beneficial to focusing light on an image plane, and simultaneously, the requirements of short back focus and miniaturization are met.

The image-side surface of the sixth lens element is concave at a paraxial region thereof and has at least one inflection point at an off-axis region thereof. Thereby, the back focal length is reduced and the off-axis aberration can be corrected.

The distance between the fifth lens element and the sixth lens element is T56, and the thickness of the sixth lens element is CT6, which satisfies the following conditions: 1.05 < T56/CT6 < 7.50. Therefore, enough space can be ensured between the fifth lens and the sixth lens, and the problem of manufacturing or assembling caused by too small peripheral distance can be avoided. Preferably, it may further satisfy the following condition: 1.60 < T56/CT6 < 4.0.

The sum of the distances between two adjacent lenses in the image lens on the optical axis is Σ AT, and the distance between the fifth lens and the sixth lens on the optical axis is T56, which satisfies the following conditions: 1.0< ∑ AT/T56 < 2.25. Therefore, the space between the lenses can be prevented from being too large, the internal space of the image lens can be properly utilized, and the requirements of short total length and miniaturization of the image lens are favorably met. Preferably, it may further satisfy the following condition: 1.20 < ∑ AT/T56 < 2.10.

A radius of curvature of the object-side surface of the fifth lens element is R9, and a radius of curvature of the image-side surface of the fifth lens element is R10, which satisfy the following conditions: 0< (R9+ R10)/(R9-R10) < 3.50. Therefore, the shape of the fifth lens element can be matched with the shapes of the third lens element and the fourth lens element, and the aberration generated by the third lens element and the fourth lens element with stronger positive refractive power can be corrected. Preferably, it may further satisfy the following condition: 0.50 < (R9+ R10)/(R9-R10) < 3.50. More preferably, it may further satisfy the following conditions: 1.0< (R9+ R10)/(R9-R10) < 3.50.

A radius of curvature of the object-side surface of the first lens element is R1, and a radius of curvature of the image-side surface of the first lens element is R2, wherein the following conditions are satisfied: -1.50 < (R1+ R2)/(R1-R2) < 2.0. Therefore, the surface shape of the first lens surface can be properly configured, which is beneficial to enlarging the field angle and reducing the aberration generation of the image lens.

The focal length of the image lens is f, the entrance pupil aperture of the image lens is EPD, which can satisfy the following conditions: f/EPD is more than 1.0 and less than 3.0. Therefore, the light-entering quantity of the image lens can be increased so as to improve the imaging quality.

A radius of curvature of the object-side surface of the sixth lens element is R11, and a radius of curvature of the image-side surface of the sixth lens element is R12, wherein: l (R11-R12)/(R11+ R12) | < 0.35. Therefore, the aberration correction excess caused by too strong refractive power of the sixth lens element can be avoided, and the manufacturing problem caused by too large aberration between the thickness of the center and the thickness of the periphery of the sixth lens element can be avoided.

The focal length of the image lens is f, the distance between the object-side surface of the first lens element and an imaging plane on the optical axis is TL, and half of the maximum view angle in the image lens is HFOV, which satisfies the following conditions: TL/[ f Tan (HFOV) ] < 1.75. Therefore, the visual angle of the image lens can be further increased, and the miniaturization of the image lens can be further promoted.

The focal length of the image lens system is f, the radius of curvature of the object-side surface of the second lens element is R3, and the radius of curvature of the image-side surface of the second lens element is R4, which satisfy the following conditions: i f/R3| + | f/R4| < 1.50. Therefore, light can be further assisted to enter the image lens, the phenomenon that the light cone is too small due to too fast light gathering can be avoided, and the improvement of the peripheral relative illumination of the image is facilitated.

In the imaging lens system, the sum of the distances on the optical axis between two adjacent lenses is ∑ AT, the distance on the optical axis between the second lens and the third lens is T23, the distance on the optical axis between the third lens and the fourth lens is T34, and the distance on the optical axis between the fourth lens and the fifth lens is T45, which satisfies the following conditions: 4 <. sigma AT/(T23+ T34+ T45) < 25. Therefore, the second lens, the third lens, the fourth lens and the fifth lens can be prevented from being too large in distance, and the lens structures can be matched easily.

The focal length of the image lens is f, and the curvature radius of the image-side surface of the sixth lens element is R12, which satisfies the following conditions: r12/f is more than 0.20 and less than 1.25. Therefore, the main point of the image lens can be moved towards the shot object, the back focal length can be shortened, and the volume and the total length of the image lens can be further miniaturized.

The maximum value of the thickness of each lens in the imaging lens on the optical axis is CTmax, and the distance between the fifth lens and the sixth lens on the optical axis is T56, which satisfies the following conditions: CTmax/T56 < 1.25. Therefore, the problem that the inner space of the image lens cannot be fully utilized due to the fact that the thickness of a single lens is too thick can be avoided, and meanwhile the problem that the lens thickness is not uniformly distributed to cause molding can be avoided.

The fourth lens has an abbe number of V4, the fifth lens has an abbe number of V5, and the sixth lens has an abbe number of V6, which satisfy the following conditions: 0.30< (V5+ V6)/V4< 1.0. Therefore, a better balance between astigmatism and chromatic aberration correction can be obtained, and the effective radius of the sixth lens element can be reduced to keep the miniaturization of the image lens.

A horizontal displacement from an intersection point of the object-side surface of the second lens element to the maximum effective radius of the object-side surface of the second lens element along the optical axis being Sag21, a horizontal displacement from an intersection point of the image-side surface of the second lens element to the maximum effective radius of the image-side surface of the second lens element along the optical axis being Sag22, and a thickness of the second lens element along the optical axis being CT2 satisfy the following conditions: (| Sag21| + | Sag22|)/CT2 < 0.25. Therefore, when the thickness of the second lens is thinner, the excessive bending of the mirror surface shape of the second lens or the too drastic shape change of the second lens can be avoided, and the problem of forming is further reduced. FIG. 16 is a schematic diagram showing the parameters Sag21 and Sag22 according to the first embodiment of the invention. The value of the horizontal displacement is defined as positive toward the image side and negative toward the object side.

A radius of curvature of the object-side surface of the third lens element is R5, and a radius of curvature of the image-side surface of the third lens element is R6, wherein the following conditions are satisfied: 0.50 < (R5+ R6)/(R5-R6) < 3.0. Therefore, the third lens element can focus light to an image plane in cooperation with the first lens element with negative refractive power, and the third lens element can effectively correct aberration generated by the first lens element.

The maximum viewing angle in the image lens is FOV, which satisfies the following conditions: 100[ degree ] < FOV < 160[ degree ]. Therefore, the image lens has a sufficient shooting range, and can effectively suppress distortion to avoid image deformation.

The distance TL from the object-side surface of the first lens element to the image plane is on the optical axis, and the maximum imaging height of the image lens is ImgH (half of the total length of the diagonal line of the effective sensing area of the electronic sensor device), which satisfies the following conditions: TL/ImgH is more than 1.0 and less than 2.30. Therefore, the miniaturization of the image lens is favorably maintained, and the image lens is more suitable for being carried on a light and thin electronic device.

The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the xth lens is fx, which satisfies the following conditions: | fx | < | f2|, where x ═ 1, 3, 4, 5, 6. Therefore, the image lens can avoid the problem that the whole refractive power of the image lens is changed too much, and further prevent the surface reflection problem caused by too large light refraction amplitude.

In the image lens disclosed by the invention, the dispersion coefficient of at least three lenses in all the lenses of the image lens is less than 30. That is, at least three lenses with abbe numbers smaller than 30 can be selected from the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens. Therefore, the focusing positions of light rays with different wave bands can be effectively balanced, and the problem of chromatic aberration is solved.

The maximum effective radius of the object-side surface of the first lens element is SD11, and the maximum effective radius of the image-side surface of the sixth lens element is SD62, which satisfy the following conditions: i SD11/SD 62I < 1.20. Therefore, the size of the first lens is reduced, and the image lens meets the requirement of miniaturization. FIG. 15 is a schematic diagram showing parameters SD11 and SD62 according to the first embodiment of the invention.

In the image lens disclosed by the invention, the material of the lens can be plastic or glass. When the lens is made of glass, the degree of freedom of the refractive power configuration can be increased. In addition, when the lens is made of plastic, the production cost can be effectively reduced. In addition, an Aspheric Surface (ASP) can be arranged on the surface of the lens, the ASP can be easily made into shapes other than a spherical surface, more control variables are obtained for reducing the aberration, and the number of the lenses required to be used is further reduced, so that the total optical length can be effectively reduced.

In the image lens disclosed by the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, the convex surface can be positioned at the position close to the optical axis of the lens surface; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the position of the lens surface near the optical axis. If the refractive power or focal length of the lens element does not define the position of the lens region, it means that the refractive power or focal length of the lens element can be the refractive power or focal length of the lens element at the paraxial region.

In the image lens disclosed in the present invention, the image plane of the image lens may be a plane or a curved surface with any curvature, especially a curved surface with a concave surface facing the object side, depending on the corresponding electronic photosensitive device.

The image lens disclosed in the present invention may be provided with at least one Stop, which may be located before the first lens, between the lenses or after the last lens, and the Stop may be of a flare Stop (Glare Stop) or Field Stop (Field Stop) type, which may be used to reduce stray light and help to improve image quality.

In the imaging lens disclosed by the invention, the arrangement of the diaphragm can be a front diaphragm or a middle diaphragm. The front diaphragm means that the diaphragm is arranged between the object to be shot and the first lens, and the middle diaphragm means that the diaphragm is arranged between the first lens and the imaging surface. If the diaphragm is a front diaphragm, a longer distance can be generated between the Exit Pupil (Exit Pupil) and the imaging surface, so that the Exit Pupil has a Telecentric (telecentricity) effect, and the image receiving efficiency of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) of the electronic photosensitive element can be increased; if the diaphragm is arranged in the middle, the optical lens group is beneficial to enlarging the field angle of the system, and has the advantages of a wide-angle lens

The invention further provides an image capturing device, which comprises the image lens and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the image lens. Preferably, the image capturing device may further include a lens barrel, a Holder Member (Holder Member), or a combination thereof.

Referring to fig. 17, 18 and 19, the image capturing device 10 can be applied to electronic devices such as a smart phone (as shown in fig. 17), a tablet computer (as shown in fig. 18), a wearable device (as shown in fig. 19) and the like in many ways. Preferably, the electronic device may further include a control unit, a display unit, a storage unit, a Random Access Memory (RAM), or a combination thereof.

The image lens of the invention can be applied to an optical system for moving focusing according to the requirements, and has the characteristics of excellent aberration correction and good imaging quality. The invention can also be applied to electronic devices such as three-dimensional (3D) image acquisition, digital cameras, mobile devices, tablet computers, smart televisions, network monitoring equipment, driving recorders, backing-up developing devices, motion sensing game machines, wearable devices and the like in many ways. The electronic device disclosed in the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the image capturing device of the present invention.

The following provides a detailed description of the embodiments with reference to the accompanying drawings.

< first embodiment >

Referring to fig. 1 and fig. 2, wherein fig. 1 is a schematic view of an image capturing device according to a first embodiment of the invention, and fig. 2 is a graph of spherical aberration, astigmatism and distortion in the first embodiment from left to right. As shown in fig. 1, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 190. The image lens element includes, in order from an object side to an image side, a first lens element 110, a second lens element 120, an aperture stop 100, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, an infrared-cut Filter (IR-cut Filter)170, and an image plane 180. The electron sensor 190 is disposed on the image plane 180. The lenses (110 and 160) of the image lens are six single non-bonded lenses.

The first lens element 110 with negative refractive power has a concave object-side surface 111 at a paraxial region thereof and a concave image-side surface 112 at a paraxial region thereof, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 111 has at least one convex surface at an off-axis region thereof.

The second lens element 120 with negative refractive power has a concave object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region, and is made of plastic material.

The third lens element 130 with positive refractive power has a convex object-side surface 131 at a paraxial region and a convex image-side surface 132 at a paraxial region, and is made of plastic material.

The fourth lens element 140 with positive refractive power has a convex object-side surface 141 at a paraxial region and a convex image-side surface 142 at a paraxial region, and is made of plastic material.

The fifth lens element 150 with negative refractive power has a concave object-side surface 151 at a paraxial region and a concave image-side surface 152 at a paraxial region, and is made of plastic material.

The sixth lens element 160 with negative refractive power has an object-side surface 161 being convex in a paraxial region thereof and an image-side surface 162 being concave in a paraxial region thereof, and both surfaces thereof are aspheric, and the image-side surface 162 has at least one inflection point in an off-axis region thereof.

The ir-cut filter 170 is made of glass, and is disposed between the sixth lens element 160 and the image plane 180, and does not affect the focal length of the image lens.

The curve equation of the aspherical surface of each lens described above is as follows:

x: the distance between a point on the aspheric surface, which is Y away from the optical axis, and the relative distance between the point and a tangent plane tangent to the intersection point on the aspheric surface optical axis;

y: the perpendicular distance between a point on the aspheric curve and the optical axis;

r: a radius of curvature;

k: the cone coefficient; and

ai: the ith order aspheric coefficients.

In the first embodiment, the focal length of the image lens is F, the aperture value (F-number) of the image lens is Fno, and half of the maximum viewing angle of the image lens is HFOV, and the values thereof are as follows: f 2.08 millimeters (mm), Fno 2.45, HFOV 60.0 degrees (deg.).

The maximum visual angle in the image lens is FOV, which satisfies the following conditions: FOV is 120 degrees.

The fourth lens 140 has an abbe number of V4, the fifth lens 150 has an abbe number of V5, and the sixth lens 160 has an abbe number of V6, which satisfy the following conditions: (V5+ V6)/V4 ═ 0.77.

The maximum value of the thickness of each lens (110-160) in the image lens on the optical axis is CTmax, and the distance between the fifth lens 150 and the sixth lens 160 on the optical axis is T56, which satisfies the following conditions: CTmax/T56 is 0.61.

The distance between the fifth lens element 150 and the sixth lens element 160 is T56, and the thickness of the sixth lens element 160 is CT6, which satisfies the following conditions: T56/CT6 is 2.12.

The sum of the distances between two adjacent lenses in the image lens is Σ AT, the distance between the second lens element 120 and the third lens element 130 is T23, the distance between the third lens element 130 and the fourth lens element 140 is T34, and the distance between the fourth lens element 140 and the fifth lens element 150 is T45, which satisfies the following conditions: Σ AT/(T23+ T34+ T45) ═ 8.12.

The sum of the distances between two adjacent lenses in the image lens is ∑ AT, and the distance between the fifth lens 150 and the sixth lens 160 is T56, which satisfies the following conditions: Σ AT/T56 ═ 1.68.

An axial distance TL from the object-side surface 111 of the first lens element to the image plane 180 is, a maximum image height ImgH of the image lens system is, which satisfies the following conditions: TL/ImgH 2.03.

The focal length of the image lens is f, the distance between the object-side surface 111 of the first lens element and the image plane 180 on the optical axis is TL, and half of the maximum view angle in the image lens is HFOV, which satisfies the following conditions: TL/[ f taun (hfov) ] ═ 1.47.

A radius of curvature of the first lens object-side surface 111 is R1, and a radius of curvature of the first lens image-side surface 112 is R2, which satisfy the following conditions: (R1+ R2)/(R1-R2) ═ 0.31.

A radius of curvature of the object-side surface 131 of the third lens element is R5, and a radius of curvature of the image-side surface 132 of the third lens element is R6, which satisfy the following conditions: (R5+ R6)/(R5-R6) ═ 0.88.

A radius of curvature of the fifth lens object-side surface 151 is R9, and a radius of curvature of the fifth lens image-side surface 152 is R10, which satisfy the following conditions: (R9+ R10)/(R9-R10) ═ 0.78.

A radius of curvature of the sixth lens object-side surface 161 is R11, and a radius of curvature of the sixth lens image-side surface 162 is R12, which satisfy the following conditions: l (R11-R12)/(R11+ Ri2) | 0.17.

The focal length of the image lens is f, and the curvature radius of the image-side surface 162 of the sixth lens element is R12, which satisfies the following conditions: r12/f is 0.89.

The focal length of the image lens system is f, the radius of curvature of the object-side surface 121 of the second lens element is R3, and the radius of curvature of the image-side surface 122 of the second lens element is R4, which satisfy the following conditions: i f/R3| + | f/R4| -0.09.

The horizontal displacement from the intersection point of the object-side surface 121 to the maximum effective radius of the object-side surface 121 of the second lens element to the optical axis is Sag21, the horizontal displacement from the intersection point of the image-side surface 122 to the maximum effective radius of the image-side surface 122 of the second lens element to the optical axis is Sag22, and the thickness of the second lens element 120 to the optical axis is CT2, which satisfies the following conditions: (| Sag21| + | Sag22|)/CT2 ═ 0.13.

The maximum effective radius of the first lens object-side surface 111 is SD11, and the maximum effective radius of the sixth lens image-side surface 162 is SD62, which satisfy the following conditions: i SD11/SD62| ═ 0.71.

In the present embodiment, the abbe number of three lenses of all the lenses (110-160) of the image lens is less than 30. In detail, the second lens 120, the fifth lens 150, and the sixth lens 160 all have an abbe number less than 30.

The following table one and table two are referred to cooperatively.

In table one, the detailed structural data of the first embodiment of fig. 1 are shown, wherein the units of the radius of curvature, the thickness and the focal length are millimeters (mm), and surfaces 0 to 16 sequentially represent surfaces from an object side to an image side. Table two shows the aspheric data of the first embodiment, where k is the cone coefficient in the aspheric curve equation, and a4 to a16 represent the 4 th to 16 th order aspheric coefficients of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those of the first and second tables of the first embodiment, which will not be described herein.

< second embodiment >

Referring to fig. 3 and fig. 4, wherein fig. 3 is a schematic view of an image capturing apparatus according to a second embodiment of the invention, and fig. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment in order from left to right. As shown in fig. 3, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 290. The image lens element includes, in order from an object side to an image side, a first lens element 210, an aperture stop 200, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, an ir-cut filter element 270 and an image plane 280. The electron sensor 190 is disposed on the image plane 180. The lenses (210-260) of the image lens are six single and non-bonded lenses.

The first lens element 210 with negative refractive power has a concave object-side surface 211 at a paraxial region, and a concave image-side surface 212 at a paraxial region, both surfaces being aspheric, and the object-side surface 211 has at least one convex surface at an off-axis region.

The second lens element 220 with positive refractive power has a convex object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region, and is made of plastic material.

The third lens element 230 with positive refractive power has a concave object-side surface 231 at a paraxial region and a convex image-side surface 232 at a paraxial region, and is made of plastic material.

The fourth lens element 240 with positive refractive power has a convex object-side surface 241 at a paraxial region and a convex image-side surface 242 at a paraxial region, and is made of plastic material.

The fifth lens element 250 with negative refractive power has a concave object-side surface 251 at a paraxial region and a concave image-side surface 252 at a paraxial region, and is made of plastic material.

The sixth lens element 260 with positive refractive power has a convex object-side surface 261 and a concave image-side surface 262, both surfaces being aspheric, and the image-side surface 262 has at least one inflection point on an off-axis side.

The ir-cut filter 270 is made of glass, and is disposed between the sixth lens element 260 and the image plane 280, and does not affect the focal length of the image lens.

Please refer to the following table three and table four.

In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< third embodiment >

Referring to fig. 5 and fig. 6, wherein fig. 5 is a schematic view of an image capturing apparatus according to a third embodiment of the invention, and fig. 6 is a graph showing spherical aberration, astigmatism and distortion in order from left to right in the third embodiment. As shown in fig. 5, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 390. The image lens includes, in order from an object side to an image side, a first lens element 310, an aperture stop 300, a second lens element 320, a stop 301, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360, an ir-cut filter element 370 and an image plane 380. The electro-optic element 390 is disposed on the image plane 380. The lenses (310-360) of the image lens are six single and non-bonded lenses. The diaphragm 301 is, for example, a flare diaphragm or a field diaphragm.

The first lens element 310 with negative refractive power has a concave object-side surface 311 at a paraxial region, and a concave image-side surface 312 at a paraxial region, both surfaces being aspheric, and the object-side surface 311 has at least one convex surface at an off-axis region.

The second lens element 320 with negative refractive power has a convex object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region, and is made of plastic material.

The third lens element 330 with positive refractive power has a concave object-side surface 331 at a paraxial region and a convex image-side surface 332 at a paraxial region, and is made of plastic material.

The fourth lens element 340 with positive refractive power has an object-side surface 341 being convex in a paraxial region thereof and an image-side surface 342 being convex in a paraxial region thereof.

The fifth lens element 350 with negative refractive power has a concave object-side surface 351 at a paraxial region and a concave image-side surface 352 at a paraxial region, and is made of plastic material.

The sixth lens element 360 with negative refractive power has a convex object-side surface 361 at a paraxial region and a concave image-side surface 362 at a paraxial region, and both surfaces are aspheric, and the image-side surface 362 has at least one inflection point at an off-axis region.

The ir-cut filter 370 is made of glass, and is disposed between the sixth lens element 360 and the image plane 380, and does not affect the focal length of the image lens.

Please refer to table five and table six below.

In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< fourth embodiment >

Referring to fig. 7 and 8, wherein fig. 7 is a schematic view of an image capturing apparatus according to a fourth embodiment of the invention, and fig. 8 is a graph showing spherical aberration, astigmatism and distortion in the fourth embodiment from left to right. As shown in fig. 7, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 490. The image lens includes, in order from an object side to an image side, a first lens element 410, an aperture stop 400, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a stop 401, a sixth lens element 460, an ir-cut filter 470 and an image plane 480. The image sensor 490 is disposed on the image plane 480. The lenses (410-460) of the image lens are six single and non-bonded lenses. The diaphragm 401 is, for example, a flare diaphragm or a field diaphragm.

The first lens element 410 with negative refractive power has a concave object-side surface 411 at a paraxial region, a concave image-side surface 412 at a paraxial region, both surfaces being aspheric, and an object-side surface 411 being convex at an off-axis region.

The second lens element 420 with negative refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at the paraxial region, and is made of plastic material.

The third lens element 430 with positive refractive power has a concave object-side surface 431 at a paraxial region and a convex image-side surface 432 at a paraxial region, and is made of plastic material.

The fourth lens element 440 with positive refractive power has a convex object-side surface 441 at a paraxial region and a convex image-side surface 442 at a paraxial region, and is made of plastic material.

The fifth lens element 450 with negative refractive power has a convex object-side surface 451 at a paraxial region and a concave image-side surface 452 at a paraxial region, and is made of plastic material.

The sixth lens element 460 with negative refractive power has a convex object-side surface 461 at a paraxial region and a concave image-side surface 462 at a paraxial region, and both surfaces are aspheric, and the image-side surface 462 has at least one inflection point at an off-axis region.

The ir-cut filter 470 is made of glass, and is disposed between the sixth lens element 460 and the image plane 480, and does not affect the focal length of the image lens.

Please refer to table seven and table eight below.

In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< fifth embodiment >

Referring to fig. 9 and 10, fig. 9 is a schematic view of an image capturing apparatus according to a fifth embodiment of the invention, and fig. 10 is a graph showing spherical aberration, astigmatism and distortion in the fifth embodiment from left to right. As shown in fig. 9, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 590. The image lens element includes, in order from an object side to an image side, a first lens element 510, an aperture stop 500, a second lens element 520, a third lens element 530, a stop 501, a fourth lens element 540, a fifth lens element 550, a sixth lens element 560, an ir-cut filter element 570 and an image plane 580. The electronic photosensitive element 590 is disposed on the image plane 580. The lenses (510-560) of the image lens are six single and non-bonded lenses. The diaphragm 501 is, for example, a flare diaphragm or a field diaphragm.

The first lens element 510 with negative refractive power has a concave object-side surface 511 at a paraxial region thereof and a concave image-side surface 512 at a paraxial region thereof, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 511 has at least one convex surface at an off-axis region thereof.

The second lens element 520 with negative refractive power has a convex object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region, and is made of plastic material.

The third lens element 530 with positive refractive power has a concave object-side surface 531 at a paraxial region and a convex image-side surface 532 at a paraxial region, and is made of plastic material.

The fourth lens element 540 with positive refractive power has a convex object-side surface 541 at a paraxial region and a convex image-side surface 542 at a paraxial region, and is made of plastic material.

The fifth lens element 550 with negative refractive power has a convex object-side surface 551 at a paraxial region and a concave image-side surface 552 at a paraxial region, and is made of plastic material.

The sixth lens element 560 with negative refractive power has a convex object-side surface 561 at a paraxial region and a concave image-side surface 562 at a paraxial region, and both surfaces are aspheric, and the image-side surface 562 has at least one inflection point at an off-axis region.

The ir-cut filter 570 is made of glass, and is disposed between the sixth lens element 560 and the image plane 580, and does not affect the focal length of the image lens.

Please refer to table nine and table ten below.

In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< sixth embodiment >

Referring to fig. 11 and 12, wherein fig. 11 is a schematic view of an image capturing apparatus according to a sixth embodiment of the invention, and fig. 12 is a graph showing spherical aberration, astigmatism and distortion in the sixth embodiment from left to right. As shown in fig. 11, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 690. The image lens element includes, in order from an object side to an image side, a first lens element 610, a second lens element 620, an aperture stop 600, a third lens element 630, a fourth lens element 640, a fifth lens element 650, a sixth lens element 660, an ir-cut filter element 670 and an image plane 680. The electro-optic device 690 is disposed on the image plane 680. The lenses (610-660) of the image lens are six single and non-bonded lenses.

The first lens element 610 with negative refractive power has a concave object-side surface 611 at a paraxial region thereof, and has a concave image-side surface 612 at a paraxial region thereof, wherein both surfaces are aspheric, and the object-side surface 611 is convex at an off-axis region thereof.

The second lens element 620 with negative refractive power has a convex object-side surface 621 at a paraxial region and a concave image-side surface 622 at a paraxial region, and is made of plastic material.

The third lens element 630 with positive refractive power has a convex object-side surface 631 and a convex image-side surface 632 at a paraxial region, and is made of plastic material.

The fourth lens element 640 with positive refractive power has a convex object-side surface 641 at a paraxial region and a convex image-side surface 642 at a paraxial region, and is made of plastic material.

The fifth lens element 650 with negative refractive power has a concave object-side surface 651 at a paraxial region and a concave image-side surface 652 at a paraxial region, and is made of plastic material.

The sixth lens element 660 with positive refractive power has a convex object-side surface 661 at a paraxial region and a concave image-side surface 662 at a paraxial region, both surfaces being aspheric, and the image-side surface 662 has at least one inflection point at an off-axis region.

The ir-cut filter 670 is made of glass, and is disposed between the sixth lens element 660 and the image plane 680 without affecting the focal length of the image lens.

Please refer to the following table eleven and table twelve.

In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< seventh embodiment >

Referring to fig. 13 and 14, wherein fig. 13 is a schematic view of an image capturing apparatus according to a seventh embodiment of the invention, and fig. 14 is a graph showing spherical aberration, astigmatism and distortion in the seventh embodiment from left to right. As shown in fig. 13, the image capturing device includes an image lens (not shown) and an electronic photosensitive element 790. The image lens element includes, in order from an object side to an image side, a first lens element 710, a second lens element 720, an aperture stop 700, a third lens element 730, a fourth lens element 740, a fifth lens element 750, a sixth lens element 760, an ir-cut filter element 770 and an image plane 780. The electronic photosensitive element 790 is disposed on the image plane 780. The lenses (710 and 760) of the image lens are six single and non-bonded lenses.

The first lens element 710 with negative refractive power has a concave object-side surface 711 at a paraxial region and a concave image-side surface 712 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, and the object-side surface 711 has at least one convex surface at an off-axis region.

The second lens element 720 with positive refractive power has a convex object-side surface 721 at a paraxial region and a concave image-side surface 722 at a paraxial region, and is made of plastic material.

The third lens element 730 with positive refractive power has a convex object-side surface 731 at a paraxial region and a convex image-side surface 732 at a paraxial region, and is made of plastic material.

The fourth lens element 740 with positive refractive power has a convex object-side surface 741 at a paraxial region and a convex image-side surface 742 at a paraxial region, and is made of plastic material.

The fifth lens element 750 with negative refractive power has a concave object-side surface 751 at a paraxial region and a concave image-side surface 752 at a paraxial region, and is made of plastic material.

The sixth lens element 760 with negative refractive power has a convex object-side surface 761 at a paraxial region and a concave image-side surface 762 at a paraxial region, wherein both surfaces are aspheric, and the image-side surface 762 has at least one inflection point at an off-axis region.

The ir-cut filter 770 is made of glass and disposed between the sixth lens element 760 and the image plane 780 without affecting the focal length of the image lens.

Please refer to the following thirteen tables and fourteen tables.

In the seventh embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

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

a first lens element with negative refractive power;

a second lens element;

a third lens element with positive refractive power;

a fourth lens element with positive refractive power;

a fifth lens element with negative refractive power having a concave image-side surface at paraxial region, wherein the object-side surface and the image-side surface are aspheric; and

a sixth lens element having a concave image-side surface at a paraxial region thereof, the image-side surface thereof having at least one inflection point at an off-axis region thereof, the object-side surface and the image-side surface thereof being aspheric;

wherein, the total number of the lenses of the image lens is six, the distance between the fifth lens and the sixth lens on the optical axis is T56, the thickness of the sixth lens on the optical axis is CT6, the abbe number of the fourth lens is V4, the abbe number of the fifth lens is V5, the abbe number of the sixth lens is V6, the distance between the object-side surface of the first lens and an imaging plane on the optical axis is TL, and the maximum imaging height of the image lens is ImgH, which satisfies the following conditions:

1.05<T56/CT6<7.50；

0.30< (V5+ V6)/V4< 1.0; and

1.0<TL/ImgH<2.30。

2. the imaging lens system of claim 1, wherein a horizontal displacement from an intersection point of the object-side surface of the second lens element to a maximum effective radius of the object-side surface of the second lens element along an optical axis is Sag21, a horizontal displacement from an intersection point of the image-side surface of the second lens element to a maximum effective radius of the image-side surface of the second lens element along an optical axis is Sag22, and an optical thickness of the second lens element is CT2, wherein:

(|Sag21|+|Sag22|)/CT2<0.25。

3. the imaging lens system of claim 1, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the focal length of the xth lens element is fx, which satisfies the following conditions:

l fx | < | f2|, where x ═ 1, 3, 4, 5, 6.

4. The imaging lens assembly of claim 1, wherein a maximum effective radius of the object-side surface of the first lens element is SD11, and a maximum effective radius of the image-side surface of the sixth lens element is SD62, wherein the following conditions are satisfied:

|SD11/SD62|<1.20。

5. the imaging lens system of claim 1, wherein the distance between the fifth lens element and the sixth lens element along the optical axis is T56, and the thickness of the sixth lens element along the optical axis is CT6, which satisfies the following conditions:

1.60<T56/CT6<4.0。

6. the imaging lens system of claim 1, wherein a focal length of the imaging lens system is f, an entrance pupil aperture of the imaging lens system is EPD, a radius of curvature of the object-side surface of the sixth lens element is R11, and a radius of curvature of the image-side surface of the sixth lens element is R12, wherein:

1.0< f/EPD < 3.0; and

|(R11-R12)/(R11+R12)|<0.35。

7. the imaging lens of claim 1, wherein a focal length of the imaging lens is f, an axial distance between the object-side surface of the first lens element and the image plane is TL, and half of a maximum field of view of the imaging lens is HFOV, which satisfies the following conditions:

TL/[f*Tan(HFOV)]<1.75。

8. the imaging lens of claim 1, wherein the maximum value of the thickness of each lens in the imaging lens on the optical axis is CTmax, and the distance between the fifth lens and the sixth lens on the optical axis is T56, which satisfies the following conditions:

CTmax/T56<1.25。

9. the imaging lens assembly of claim 1, wherein a radius of curvature of the object-side surface of the third lens element is R5, and a radius of curvature of the image-side surface of the third lens element is R6, wherein:

0.50<(R5+R6)/(R5-R6)<3.0。

10. an image capturing device, comprising:

the imaging lens of claim 1; and

and the electronic photosensitive element is arranged on the imaging surface of the image lens.

11. An image lens assembly, in order from an object side to an image side, comprising:

a first lens element with negative refractive power;

a second lens element;

a third lens element with positive refractive power;

a fourth lens element with positive refractive power;

wherein the total number of the lenses of the image lens is six, an axial distance between the fifth lens element and the sixth lens element is T56, an axial thickness of the sixth lens element is CT6, a focal length of the image lens is f, a radius of curvature of the image-side surface of the sixth lens element is R12, an axial distance between the object-side surface of the first lens element and an imaging plane is TL, a maximum imaging height of the image lens is ImgH, a maximum effective radius of the object-side surface of the first lens element is SD11, and a maximum effective radius of the image-side surface of the sixth lens element is SD62, and the following conditions are satisfied:

1.05<T56/CT6<7.50；

0.20<R12/f<1.25；

1.0< TL/ImgH < 2.30; and

|SD11/SD62|<1.20。

12. the imaging lens system of claim 11, wherein a horizontal displacement from an intersection point of the object-side surface of the second lens element to a maximum effective radius of the object-side surface of the second lens element along an optical axis is Sag21, a horizontal displacement from an intersection point of the image-side surface of the second lens element to a maximum effective radius of the image-side surface of the second lens element along an optical axis is Sag22, and an optical thickness of the second lens element is CT2, satisfying the following conditions:

(|Sag21|+|Sag22|)/CT2<0.25。

13. the imaging lens system of claim 11, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the focal length of the xth lens element is fx, which satisfies the following conditions:

l fx | < | f2|, where x ═ 1, 3, 4, 5, 6.

14. The imaging lens assembly of claim 11, wherein a radius of curvature of the object-side surface of the first lens element is R1, and a radius of curvature of the image-side surface of the first lens element is R2, wherein:

-1.50<(R1+R2)/(R1-R2)<2.0。

15. the imaging lens system of claim 11, wherein the distance separating the fifth lens element and the sixth lens element on the optical axis is T56, and the thickness of the sixth lens element on the optical axis is CT6, which satisfies the following conditions:

1.60<T56/CT6<4.0。

16. the imaging lens of claim 11, wherein a focal length of the imaging lens is f, an axial distance between the object-side surface of the first lens element and the image plane is TL, and half of a maximum field of view of the imaging lens is HFOV, which satisfies the following conditions:

TL/[f*Tan(HFOV)]<1.75。

17. the imaging lens of claim 11, wherein the maximum value of the thickness of each lens in the imaging lens on the optical axis is CTmax, and the distance between the fifth lens and the sixth lens on the optical axis is T56, which satisfies the following conditions:

CTmax/T56<1.25。

18. the imaging lens assembly of claim 11, wherein a radius of curvature of the object-side surface of the third lens element is R5, and a radius of curvature of the image-side surface of the third lens element is R6, wherein:

0.50<(R5+R6)/(R5-R6)<3.0。

19. an image capturing device, comprising:

the imaging lens of claim 11; and

20. An image lens assembly, in order from an object side to an image side, comprising:

a first lens element with negative refractive power;

a second lens element;

a third lens element with positive refractive power;

a fourth lens element with positive refractive power;

a sixth lens element with negative refractive power having a concave image-side surface at a paraxial region thereof and at least one inflection point at an off-axis region thereof, wherein the object-side surface and the image-side surface thereof are aspheric;

wherein the total number of the lenses of the image lens is six, an axial distance between the fifth lens element and the sixth lens element is T56, an axial thickness of the sixth lens element is CT6, an axial distance between the object-side surface of the first lens element and an imaging plane is TL, a maximum imaging height of the image lens is ImgH, a maximum effective radius of the object-side surface of the first lens element is SD11, and a maximum effective radius of the image-side surface of the sixth lens element is SD62, and the following conditions are satisfied:

1.05<T56/CT6<7.50；

1.0< TL/ImgH < 2.30; and

|SD11/SD62|<1.20。

21. the imaging lens system of claim 20, wherein a horizontal displacement from an intersection point of the object-side surface of the second lens element to a maximum effective radius of the object-side surface of the second lens element along an optical axis is Sag21, a horizontal displacement from an intersection point of the image-side surface of the second lens element to a maximum effective radius of the image-side surface of the second lens element along an optical axis is Sag22, and an optical thickness of the second lens element is CT2, satisfying the following conditions:

(|Sag21|+|Sag22|)/CT2<0.25。

22. the imaging lens system of claim 20, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the focal length of the xth lens element is fx, which satisfies the following conditions:

l fx | < | f2|, where x ═ 1, 3, 4, 5, 6.

23. The imaging lens system of claim 20, wherein the distance separating the fifth lens element and the sixth lens element on the optical axis is T56, and the thickness of the sixth lens element on the optical axis is CT6, which satisfies the following conditions:

1.60<T56/CT6<4.0。

24. the imaging lens of claim 20, wherein a focal length of the imaging lens is f, an axial distance between the object-side surface of the first lens element and the image plane is TL, and half of a maximum field of view of the imaging lens is HFOV, which satisfies the following conditions:

TL/[f*Tan(HFOV)]<1.75。

25. the imaging lens assembly of claim 20, wherein a radius of curvature of the object-side surface of the fifth lens element is R9, and a radius of curvature of the image-side surface of the fifth lens element is R10, wherein:

0<(R9+R10)/(R9-R10)<3.50。

26. the imaging lens of claim 20, wherein the maximum value of the thickness of each lens in the imaging lens on the optical axis is CTmax, and the distance between the fifth lens and the sixth lens on the optical axis is T56, which satisfies the following conditions:

CTmax/T56<1.25。

27. the imaging lens assembly of claim 20, wherein a radius of curvature of the object-side surface of the third lens element is R5, and a radius of curvature of the image-side surface of the third lens element is R6, wherein:

0.50<(R5+R6)/(R5-R6)<3.0。

28. an image capturing device, comprising:

the imaging lens of claim 20; and