CN108427182B

CN108427182B - Imaging optical lens group and image capturing device

Info

Publication number: CN108427182B
Application number: CN201810244735.7A
Authority: CN
Inventors: 黄歆璇
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2020-06-23
Anticipated expiration: 2034-12-30
Also published as: CN108427187B; CN105807407A; CN105807407B; CN108427187A; CN108427182A

Abstract

The invention discloses an imaging optical lens group and an image capturing device. The imaging optical lens assembly 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 with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The fifth lens element with negative refractive power. At least one surface of at least one of the fifth lens element and the sixth lens element has at least one inflection point. The imaging optical lens group comprises six lenses, and at least four of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of plastic. When the specific condition is satisfied, the camera can focus on a specific area to be shot at a distance so as to improve the capturing capability of the high-resolution image in the area.

Description

Imaging optical lens group and image capturing device

The present application is a divisional application of patent applications entitled "imaging optical lens group, image capturing device, and electronic device" filed as 2014, 12 and 30, and filed as 201410839755.0.

Technical Field

The present invention relates to an imaging optical lens assembly and an image capturing device, and more particularly to a miniaturized imaging optical lens assembly and an image capturing device applied to an electronic device.

Background

In recent years, with the rise of portable electronic products with a photographing function, the demand of an optical system is increasing. The photosensitive elements of a general optical system are not limited to a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (cmos) Device, and with the refinement of Semiconductor manufacturing technology, the pixel size of the photosensitive elements is reduced, and the optical system is gradually developed in the high pixel field, so that the requirements for imaging quality are increased.

The traditional optical system for long-range photography (Telephoto) mostly adopts a multi-piece structure and carries a spherical glass lens, the configuration not only causes the lens to have overlarge volume and is difficult to carry, but also causes consumers to look away at the same time because of overhigh unit price of the product, and therefore the known optical system cannot meet the requirement of pursuing convenience and multifunctionality of common consumers at present.

Disclosure of Invention

The invention provides an imaging optical lens group, which can avoid the overlarge volume of the imaging optical lens group and enable the image points of long-range shooting to be more concentrated by the configuration of the refractive power of a first lens element and a second lens element. Furthermore, the focal length and the maximum image height of the imaging optical lens group can be controlled to focus on a specific area to be shot at a distance, so that the capturing capability of the high-resolution image in the area is improved.

According to the present invention, an imaging optical lens assembly 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 with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The fifth lens element with negative refractive power has at least one inflection point on at least one surface thereof. The imaging optical lens group comprises six lenses, and at least four of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of plastic. The focal length of the imaging optical lens assembly is f, the maximum image height of the imaging optical lens assembly is ImgH, and the distance from the object-side surface of the first lens element to the image plane on the optical axis is TL, which satisfies the following conditions:

2.0< f/ImgH is less than or equal to 3.18; and

0.70<TL/f<1.0。

according to another aspect of the present invention, an image capturing device includes the imaging optical lens assembly and an electronic sensor, wherein the electronic sensor is disposed on an image plane of the imaging optical lens assembly.

According to another aspect of the present invention, an imaging optical lens assembly 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 with positive refractive power has a convex object-side surface and a concave image-side surface. The second lens element has negative refractive power. The fifth lens element with negative refractive power has at least one inflection point on at least one surface thereof. The imaging optical lens group comprises six lenses, and at least four of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of plastic. The focal length of the imaging optical lens assembly is f, the maximum image height of the imaging optical lens assembly is ImgH, and the distance from the object-side surface of the first lens element to the image plane on the optical axis is TL, which satisfies the following conditions:

2.0< f/ImgH; and

0.70<TL/f<1.0。

According to another aspect of the present invention, an imaging optical lens assembly 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 with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The fifth lens element with negative refractive power has at least one inflection point on at least one surface thereof. The imaging optical lens group comprises six lenses, and at least four of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of plastic. The focal length of the imaging optical lens assembly is f, the maximum image height of the imaging optical lens assembly is ImgH, and the distance from the object-side surface of the first lens element to the image plane on the optical axis is TL, which satisfies the following conditions:

2.0<f/ImgH；

0.70< TL/f < 1.0; and

2.0<TL/ImgH<3.0。

When the f/ImgH meets the above conditions, the focusing range can be concentrated in a distant area, so as to improve the capturing capability of the high-resolution image in the area.

When TL/f satisfies the above condition, the miniaturization of the imaging optical lens assembly can be effectively maintained.

When TL/ImgH satisfies the above condition, the total length of the imaging optical lens assembly can be effectively shortened while the field of view is controlled, and the miniaturization of the imaging optical lens assembly is maintained.

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 showing the spherical aberration, astigmatism and distortion of the first embodiment in order from left to right;

FIG. 3 is a schematic view illustrating an image capturing device according to a second embodiment of the present invention;

FIG. 4 is a graph showing the spherical aberration, astigmatism and distortion of the second embodiment in order from left to right;

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

FIG. 6 is a graph showing the spherical aberration, astigmatism and distortion of the third embodiment in order from left to right;

FIG. 7 is a schematic view illustrating an image capturing apparatus according to a fourth embodiment of the present invention;

FIG. 8 is a graph showing the spherical aberration, astigmatism and distortion of the fourth embodiment in order 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 showing the spherical aberration, astigmatism and distortion of the fifth embodiment in order from left to right;

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

FIG. 12 is a graph showing spherical aberration, astigmatism and distortion curves 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 of the seventh embodiment in order from left to right;

fig. 15 is a schematic view illustrating an image capturing apparatus according to an eighth embodiment of the present invention;

FIG. 16 is a graph showing the spherical aberration, astigmatism and distortion of the eighth embodiment in order from left to right;

fig. 17 is a schematic view illustrating an image capturing apparatus according to a ninth embodiment of the invention;

FIG. 18 is a graph showing spherical aberration, astigmatism and distortion curves of the ninth embodiment, in order from left to right;

fig. 19 is a schematic view illustrating an image capturing apparatus according to a tenth embodiment of the invention;

FIG. 20 is a graph showing the spherical aberration, astigmatism and distortion of the tenth embodiment in order from left to right;

FIG. 21 is a schematic view illustrating SAG62 as a parameter of the imaging optical lens assembly of the image capturing device of FIG. 1;

FIG. 22 is a schematic view of an electronic device according to an eleventh embodiment of the invention;

FIG. 23 is a schematic view of an electronic device according to a twelfth embodiment of the invention; and

fig. 24 is a schematic view illustrating an electronic device according to a thirteenth embodiment of the invention.

[ notation ] to show

An electronic device: 10. 20, 30

An image taking device: 11. 21, 31

Aperture: 100. 200, 300, 400, 500, 600, 700, 800, 900, 1000

A first lens: 110. 210, 310, 410, 510, 610, 710, 810, 910, 1010

An object-side surface: 111. 211, 311, 411, 511, 611, 711, 811, 911, 1011

Image-side surface: 112. 212, 312, 412, 512, 612, 712, 812, 912, 1012

A second lens: 120. 220, 320, 420, 520, 620, 720, 820, 920, 1020

An object-side surface: 121. 221, 321, 421, 521, 621, 721, 821, 921, 1021

Image-side surface: 122. 222, 322, 422, 522, 622, 722, 822, 922, 1022

A third lens: 130. 230, 330, 430, 530, 630, 730, 830, 930, 1030

An object-side surface: 131. 231, 331, 431, 531, 631, 731, 831, 931, 1031

Image-side surface: 132. 232, 332, 432, 532, 632, 732, 832, 932, 1032

A fourth lens: 140. 240, 340, 440, 540, 640, 740, 840, 940, 1040

An object-side surface: 141. 241, 341, 441, 541, 641, 741, 841, 941, 1041

Image-side surface: 142. 242, 342, 442, 542, 642, 742, 842, 942, 1042

A fifth lens: 150. 250, 350, 450, 550, 650, 750, 850, 950, 1050

An object-side surface: 151. 251, 351, 451, 551, 651, 751, 851, 951, 1051

Image-side surface: 152. 252, 352, 452, 552, 652, 752, 852, 952, 1052

A sixth lens: 160. 260, 360, 460, 560, 660, 760, 860, 960, 1060

An object-side surface: 161. 261, 361, 461, 561, 661, 761, 861, 961, 1061

Image-side surface: 162. 262, 362, 462, 562, 662, 762, 862, 962, 1062

Infrared ray filtering filter element: 170. 270, 370, 470, 570, 670, 770, 870, 970, 1070

Imaging surface: 180. 280, 380, 480, 580, 680, 780, 880, 980, 1080

An electron-sensitive element: 190. 290, 390, 490, 590, 690, 790, 890, 990, 1090

f: focal length of imaging optical lens group

Fno: aperture value of imaging optical lens group

HFOV: half of maximum visual angle of imaging optical lens group

V1: abbe number of first lens

V2: abbe number of second lens

V3: abbe number of third lens

V4: abbe number of fourth lens

V5: abbe number of fifth lens

V6: abbe number of sixth lens

N1: refractive index of the first lens

N2: refractive index of the second lens

N3: refractive index of third lens

N4: refractive index of fourth lens

N5: refractive index of fifth lens

N6: refractive index of sixth lens

Nmax: the largest of N1, N2, N3, N4, N5 and N6

CT 1: thickness of the first lens on the optical axis

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

CT 3: thickness of the third lens on the optical axis

CT 4: thickness of the fourth lens on the optical axis

CT 5: thickness of the fifth lens element on the optical axis

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

CTmax: the largest of CT1, CT2, CT3, CT4, CT5 and CT6

Sigma CT: the sum of thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis

T12: the distance between the first lens and the second lens on the optical axis

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

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

ImgH: maximum image height of imaging optical lens group

f 12: the combined focal length of the first lens and the second lens

f 3456: the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens

Y11: maximum effective radius of object-side surface of the first lens

Y62: maximum effective radius of image-side surface of sixth lens

SAG 62: a horizontal displacement distance from the intersection point of the image-side surface of the sixth lens on the optical axis to the maximum effective radius position of the image-side surface of the sixth lens on the optical axis

Σ AT: the sum of the distances between two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis

SD: distance from aperture to image side surface of sixth lens element on optical axis

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

Detailed Description

According to another aspect of the present invention, an imaging optical lens assembly 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, wherein the number of the lens elements having refractive power in the imaging optical lens assembly is six.

Any two adjacent lenses with refractive power have a spacing distance therebetween in the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element of the imaging optical lens assembly of the front section; that is, the imaging optics group has six single non-cemented lenses. Since 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 degree of adhesion when the two lenses are bonded, and the poor degree of adhesion caused by deviation may occur during the bonding process, which affects the overall optical imaging quality. Therefore, in the imaging optical lens assembly of the present invention, a distance is formed between any two adjacent lenses with refractive power, so as to effectively solve the problem caused by the lens adhesion.

In the imaging optical lens assembly of the previous paragraph, there is no relative movement between the lenses with refractive power, so that the optical axis alignment deviation between the lenses caused by the lens movement can be reduced.

The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface. Therefore, the converging capability of the whole light of the imaging optical lens group can be concentrated on the object side end, the shortening of the back focal length and the miniaturization of the imaging optical lens group are facilitated, and the generation of astigmatism can be reduced.

The second lens element with negative refractive power has a concave image-side surface. Therefore, the optical path of different wave bands can be adjusted, the image points are more concentrated, and the aberration of the imaging optical lens group can be effectively corrected.

The third lens element with positive refractive power has a concave image-side surface. Therefore, the sensitivity of the imaging optical lens group can be effectively reduced.

The fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface. Therefore, astigmatism can be effectively corrected and sensitivity can be reduced.

The fifth lens element with negative refractive power has a concave image-side surface. Thereby, astigmatism can be effectively corrected. Moreover, the object-side surface of the fifth lens element can be changed from convex to concave from a paraxial position to an off-axis position to correct the aberration of the off-axis field.

The sixth lens element with negative refractive power has a concave object-side surface and a convex image-side surface. Therefore, the Principal Point (Principal Point) of the imaging optical lens group can be far away from the imaging surface, which is beneficial to shortening the back focal length to maintain miniaturization, and simultaneously, the imaging size is controlled, so that the pixel of the single photosensitive element has enough light receiving area.

Furthermore, at least one surface of at least one of the fifth lens element and the sixth lens element may have at least one inflection point. Therefore, the angle of incidence of the light in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be corrected.

The imaging optical lens assembly further includes an aperture stop disposed between the object and the second lens element (no lens element with refractive power is disposed between the aperture stop and the first lens element). Therefore, the distance between the exit pupil (exitpurl) of the imaging optical lens group and the imaging plane can be increased, so that the Telecentric (telecentricity) effect is improved, and the light receiving efficiency of the electronic photosensitive element is increased. Preferably, the diaphragm may be disposed between the object and the first lens element (there is no lens element with refractive power between the diaphragm and the object).

The focal length of the imaging optical lens group is f, the maximum image height of the imaging optical lens group is ImgH, and the following conditions are satisfied: 2.0< f/ImgH. Therefore, the focusing range can be concentrated in a remote area, so that the capturing capability of the high-resolution image in the area is improved.

The total thickness of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element on the optical axis is Σ CT, the total distance between two adjacent lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element on the optical axis is Σ AT, and the distance between the stop and the image-side surface of the sixth lens element on the optical axis is SD, which satisfies the following conditions: 0.90< (Σ CT + Σ AT)/SD < 1.30. Therefore, the balance can be obtained between the fineness of the long-range shooting and the system space configuration. Preferably, the following conditions are satisfied: 0.90< (Σ CT + Σ AT)/SD < 1.20.

The sum of the thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element on the optical axis is Σ CT, and the sum of the distances between two adjacent lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element on the optical axis is Σ AT, which satisfies the following conditions: 1.55< (Σ CT + Σ AT)/Σ CT. Therefore, the assembly of the lens is facilitated, and the miniaturization of the imaging optical lens group can be effectively maintained.

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis and the focal length f of the imaging optical lens assembly satisfy the following conditions: 0.50< TL/f < 1.15. Therefore, the miniaturization of the imaging optical lens group can be effectively maintained. Preferably, the following conditions are satisfied: 0.70< TL/f < 1.05. More preferably, the following conditions may be satisfied: 0.70< TL/f < 1.0.

The fourth lens has an abbe number V4, which satisfies the following condition: v4< 30. Therefore, the correction of the chromatic aberration of the imaging optical lens group is facilitated.

The focal length of the imaging optical lens assembly is f, and the radius of curvature of the object-side surface of the first lens element is R1, which satisfies the following conditions: 3.0< f/R1. Therefore, the refractive power of the side end of the system can be enhanced, and the resolution capability of the remote detail image is improved.

The distance between the fifth lens element and the sixth lens element along the optical axis is T56, the thickness of the first lens element along the optical axis is CT1, the thickness of the second lens element along the optical axis is CT2, the thickness of the third lens element along the optical axis is CT3, the thickness of the fourth lens element along the optical axis is CT4, the thickness of the fifth lens element along the optical axis is CT5, and the thickness of the sixth lens element along the optical axis is CT6, wherein the maximum is CTmax, which satisfies the following conditions: 0.70< T56/CTmax. Thus, the distance between the lenses and the thickness of the lenses can be appropriately set, so that the light beam can be adjusted in a sufficient space, and the high-order aberration and the image curvature can be corrected.

Half of the maximum viewing angle of the imaging optics set is HFOV, which satisfies the following conditions: 7.5 degrees < HFOV <23.5 degrees. Therefore, the device has proper field angle and image capturing range.

A horizontal displacement distance from an intersection point of the image-side surface of the sixth lens on the optical axis to a maximum effective radius position of the image-side surface of the sixth lens on the optical axis is SAG62, and a thickness of the sixth lens on the optical axis is CT6, which satisfies the following conditions: SAG62+ CT6<0 mm. Therefore, the incident angle of peripheral light rays of the system incident on the imaging surface can be effectively controlled, so that the receiving efficiency of the photosensitive element is improved, and the generation of image dark corners is avoided.

The refractive index of the first lens is N1, the refractive index of the second lens is N2, the refractive index of the third lens is N3, the refractive index of the fourth lens is N4, the refractive index of the fifth lens is N5, and the refractive index of the sixth lens is N6, wherein the maximum refractive index is Nmax, and the following conditions are met: nmax < 1.70. Thereby, correction of aberration is facilitated.

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 image height of the imaging optical lens assembly is ImgH, which satisfies the following conditions: 2.0< TL/ImgH < 3.0. Therefore, the total length of the imaging optical lens group can be effectively shortened while the field range is controlled, and the miniaturization of the imaging optical lens group is maintained.

The thickness of the sixth lens element along the optical axis is CT6, and the distance between the first lens element and the second lens element along the optical axis is T12, which satisfies the following conditions: 2< CT6/T12< 30. Therefore, the manufacturing and assembly of the lens are facilitated, and the manufacturing yield is improved.

The first lens has an abbe number of V1, the second lens has an abbe number of V2, the third lens has an abbe number of V3, 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, at least two of which are smaller than 27. Therefore, the chromatic aberration of the imaging optical lens group can be effectively corrected, and the imaging quality is maintained.

The combined focal length of the first lens element and the second lens element is f12, and the combined focal length of the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is f3456, which satisfies the following conditions: f12/f3456< 0.30. Therefore, through proper configuration of the refractive power of the object side end and the image side end of the imaging optical lens assembly, the requirements of resolution and miniaturization of long-range shooting are effectively met.

The maximum effective radius of the object-side surface of the first lens element is Y11, and the maximum effective radius of the image-side surface of the sixth lens element is Y62, which satisfy the following conditions: 0.50< Y11/Y62< 0.80. Therefore, the system can suppress the total length of the system and simultaneously has enough light inlet quantity so as to improve the image quality.

The optical axis distance between the first lens element and the second lens element is T12, the optical axis distance between the second lens element and the third lens element is T23, the optical axis distance between the third lens element and the fourth lens element is T34, the optical axis distance between the fourth lens element and the fifth lens element is T45, and the optical axis distance between the fifth lens element and the sixth lens element is T56, which satisfies the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56. Therefore, the arrangement among the lenses is facilitated, and the manufacturing efficiency is improved.

In the imaging optical lens assembly provided by the invention, the lens can be made of plastic or glass. When the lens is made of plastic, the production cost can be effectively reduced. In addition, when the lens element is made of glass, the degree of freedom of the refractive power configuration of the imaging optical lens assembly can be increased. In addition, the object-side surface and the image-side surface of the imaging optical lens assembly can be Aspheric Surfaces (ASP), which can be easily made into shapes other than spherical surfaces to obtain more control variables for reducing aberration and further reducing the number of lenses, thereby effectively reducing the total track length of the imaging optical lens assembly of the present invention.

In the imaging optical lens assembly provided by the invention, if the lens surface is convex and the position of the convex surface is not defined, the lens surface is convex at a position close to the optical axis; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at the paraxial region. In the imaging optical lens assembly provided by the present invention, if the lens element has positive refractive power or negative refractive power, or the focal length of the lens element, the refractive power or the focal length of the lens element at the paraxial region of the lens element is referred to.

In the imaging optical lens assembly of the present invention, the Image Surface (Image Surface) may be a flat Surface 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 element.

The imaging optical lens assembly of the present invention may further include a stop, wherein the stop may be a front stop or a middle stop, the front stop means that the stop is disposed between the object and the first lens element, and the middle stop means that the stop is disposed between the first lens element and the imaging plane. If the diaphragm is a front diaphragm, a longer distance can be generated between the Exit Pupil (Exit Pupil) of the imaging optical lens group and the imaging surface, so that the imaging optical lens group 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 aperture is set in the middle, it is helpful to enlarge the field angle of the system, so that the imaging optical lens set has the advantage of wide-angle lens.

In addition, in the imaging optical lens assembly of the invention, at least one diaphragm can be arranged according to requirements to reduce stray light, which is beneficial to improving the image quality.

The imaging optical lens group has the characteristics of excellent aberration correction and good imaging quality. But also can be applied to electronic devices such as 3D (three-dimensional) image acquisition, digital cameras, mobile devices, digital flat panels, smart televisions, network monitoring equipment, motion sensing game machines, automobile data recorders, backing developing devices, wearable devices and the like in many aspects.

The invention further provides an image capturing device, which comprises the imaging optical lens assembly and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on an imaging surface of the imaging optical lens assembly. In the imaging optical lens assembly, by properly adjusting the refractive power of the first lens element and the second lens element, the imaging optical lens assembly can avoid an over-large volume and make the image point of the long shot more concentrated. Moreover, the distance between the exit pupil and the image plane of the lens group can be increased by the arrangement of the aperture and the first lens, so as to improve the telecentric effect and further increase the efficiency of the electronic photosensitive element for receiving light. Preferably, the image capturing device may further include a Barrel (Barrel Member), a Holder (Holder Member), or a combination thereof.

The invention provides an electronic device comprising the image capturing device. Therefore, the advantages of the long-range shooting are brought into play, and meanwhile, the lens configuration and the surface shape design are excellent, so that the requirements on the resolution and the miniaturization of the long-range shooting are met. Preferably, the electronic device may further include a Control Unit (Control Unit), a Display Unit (Display), a Storage Unit (Storage Unit), a Random Access Memory (RAM), or a combination thereof.

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 diagram 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 of the first embodiment in order from left to right. As shown in fig. 1, the image capturing device of the first embodiment includes an imaging optical lens set (not numbered) and an electronic photosensitive element 190. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 100, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, an ir-cut filter element 170, and an image plane 180, and the electro-optic sensor 190 is disposed on the image plane 180 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (110 and 160), a distance is provided between any two adjacent lens elements with refractive power, and no relative movement is generated between the lens elements with refractive power.

The first lens element 110 with positive refractive power has a convex object-side surface 111 and a concave image-side surface 112.

The second lens element 120 with negative refractive power has a convex object-side surface 121 and a concave image-side surface 122.

The third lens element 130 with positive refractive power has a convex object-side surface 131 and a concave image-side surface 132.

The fourth lens element 140 with positive refractive power has a concave object-side surface 141 and a convex image-side surface 142.

The fifth lens element 150 with negative refractive power has a convex object-side surface 151 and a concave image-side surface 152. In addition, the fifth lens element object-side surface 151 has at least one inflection point, and the fifth lens element object-side surface 151 changes from convex to concave from a paraxial region to an off-axis region.

The sixth lens element 160 with negative refractive power has a concave object-side surface 161 and a convex image-side surface 162. In addition, the sixth lens object side surface 161 has at least one inflection point.

The ir-cut filter element 170 is made of glass, and is disposed between the sixth lens element 160 and the image plane 180 without affecting the focal length of the imaging optical lens assembly.

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

wherein:

x: the distance between the point on the aspheric surface, which is Y from the optical axis, and the relative distance between the point and the tangent plane of the intersection point tangent to 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 of the present imaging optical lens group, the focal length of the imaging optical lens group is f, the aperture value (f-number) of the imaging optical lens group is Fno, and half of the maximum field angle of the imaging optical lens group is HFOV, and the values thereof are as follows: f is 5.96 mm; fno 2.60; and HFOV-20.0 degrees.

In the first embodiment of the imaging optical lens assembly, the fourth lens element 140 has an abbe number V4, which satisfies the following condition: v4 ═ 23.3.

In the first embodiment of the imaging optical lens assembly, the refractive index of the first lens element 110 is N1, the refractive index of the second lens element 120 is N2, the refractive index of the third lens element 130 is N3, the refractive index of the fourth lens element 140 is N4, the refractive index of the fifth lens element 150 is N5, and the refractive index of the sixth lens element 160 is N6, where the maximum refractive index is Nmax, which satisfies the following conditions: nmax is 1.640.

In the first embodiment of the optical imaging lens assembly, the thickness of the sixth lens element 160 on the optical axis is CT6, and the distance between the first lens element 110 and the second lens element 120 on the optical axis is T12, which satisfies the following conditions: CT6/T12 is 14.10.

In the first embodiment of the imaging optical lens assembly, an axial distance between the fifth lens element 150 and the sixth lens element 160 is T56, an axial thickness of the first lens element 110 is CT1, an axial thickness of the second lens element 120 is CT2, an axial thickness of the third lens element 130 is CT3, an axial thickness of the fourth lens element 140 is CT4, an axial thickness of the fifth lens element 150 is CT5, and an axial thickness of the sixth lens element 160 is CT6, where the maximum is CTmax, which satisfies the following conditions: T56/CTmax is 2.03.

In the first embodiment of the present imaging optical lens assembly, the focal length of the imaging optical lens assembly is f, and the radius of curvature of the object-side surface 111 of the first lens element is R1, which satisfies the following conditions: f/R1 ═ 4.05.

In the first embodiment of the present imaging optical lens assembly, the focal length of the imaging optical lens assembly is f, and the maximum image height of the imaging optical lens assembly is ImgH (i.e. half of the diagonal length of the effective sensing area of the electronic sensing element 190), which satisfies the following conditions: f/ImgH is 2.67.

In the first embodiment of the present imaging optical lens assembly, a combined focal length of the first lens element 110 and the second lens element 120 is f12, and a combined focal length of the third lens element 130, the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 is f3456, which satisfy the following conditions: f12/f3456 is-0.41.

In the first embodiment of the present optical lens assembly, the maximum effective radius of the object-side surface 111 of the first lens element is Y11, and the maximum effective radius of the image-side surface 162 of the sixth lens element is Y62, so that the following conditions are satisfied: Y11/Y62 equals 0.66.

Referring to fig. 21, a schematic diagram of a parameter SAG62 of the imaging optical lens set in the image capturing apparatus according to fig. 1 is shown. In fig. 21, the horizontal shift distance from the intersection point of the image-side surface 162 of the sixth lens element to the maximum effective radius of the image-side surface 162 of the sixth lens element along the optical axis is SAG62 (the horizontal shift distance is negative in the object-side direction, SAG 62; the horizontal shift distance is positive in the image-side direction, SAG 62), and the thickness of the sixth lens element 160 along the optical axis is CT6, which satisfies the following condition: SAG62+ CT 6-0.34 mm.

In the imaging optical lens assembly of the first embodiment, a total axial thickness of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 is Σ CT, a total axial distance between two adjacent lens elements of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 is Σ AT, and an axial distance between the aperture stop 100 and the image-side surface 162 of the sixth lens element is SD, which satisfies the following conditions: (Σ CT + Σ AT)/SD is 1.13.

In the first embodiment of the imaging optical lens assembly, a total thickness of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 on the optical axis is Σ CT, a total distance between two adjacent lens elements of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 on the optical axis is Σ AT, and they satisfy the following conditions: (Σ CT + Σ AT)/Σ CT is 1.92.

In the first embodiment of the present imaging optical lens assembly, an axial distance between the object-side surface 111 of the first lens element and the image plane 180 is TL, a focal length of the imaging optical lens assembly is f, and the following conditions are satisfied: TL/f is 0.89.

In the imaging optical lens assembly of the first embodiment, the distance between the object-side surface 111 of the first lens element and the image plane 180 is TL, the maximum image height of the imaging optical lens assembly is ImgH, and the following conditions are satisfied: TL/ImgH 2.39.

In the first embodiment of the imaging optical lens group, the first lens element 110 has an abbe number of V1, the second lens element 120 has an abbe number of V2, the third lens element 130 has an abbe number of V3, the fourth lens element 140 has an abbe number of V4, the fifth lens element 150 has an abbe number of V5, and the sixth lens element 160 has an abbe number of V6, where both (V2 ═ 23.3 and V4 ═ 23.3) are less than 27.

In the first embodiment of the present imaging optical lens assembly, an axial separation distance between the first lens element 110 and the second lens element 120 is T12, an axial separation distance between the second lens element 120 and the third lens element 130 is T23, an axial separation distance between the third lens element 130 and the fourth lens element 140 is T34, an axial separation distance between the fourth lens element 140 and the fifth lens element 150 is T45, and an axial separation distance between the fifth lens element 150 and the sixth lens element 160 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56.

The following list I and list II 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 mm, and the surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Table II shows aspheric data of the first embodiment, where k represents the cone coefficients in the aspheric curve equation, and A4-A14 represents the 4 th to 14 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 is not repeated herein.

< second embodiment >

Referring to fig. 3 and fig. 4, wherein fig. 3 is a schematic diagram of an image capturing device 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 of the second embodiment includes an imaging optical lens set (not labeled) and an electronic photosensitive element 290. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 200, a first lens element 210, 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, and the electro-optic sensing element 290 is disposed on the image plane 280 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (210 and 260), a distance is provided between any two adjacent lens elements with refractive power, and no relative movement is generated between the lens elements with refractive power.

The first lens element 210 with positive refractive power has a convex object-side surface 211 and a concave image-side surface 212.

The second lens element 220 with negative refractive power has a convex object-side surface 221 and a concave image-side surface 222.

The third lens element 230 with positive refractive power has a convex object-side surface 231 and a concave image-side surface 232.

The fourth lens element 240 with positive refractive power has a concave object-side surface 241 and a convex image-side surface 242.

The fifth lens element 250 with negative refractive power has a convex object-side surface 251 and a concave image-side surface 252. In addition, the fifth lens element object-side surface 251 has at least one inflection point, and the fifth lens element object-side surface 251 is convex at a paraxial region to concave at an off-axis region.

The sixth lens element 260 with negative refractive power has a concave object-side surface 261 and a convex image-side surface 262. In addition, the sixth lens object-side surface 261 has at least one inflection point.

The ir-cut filter 270 is made of glass, and is disposed between the sixth lens element 260 and the image plane 280 without affecting the focal length of the imaging optical lens assembly.

In the imaging optical lens group of the second embodiment, the first lens element 210 has an abbe number of V1, the second lens element 220 has an abbe number of V2, the third lens element 230 has an abbe number of V3, the fourth lens element 240 has an abbe number of V4, the fifth lens element 250 has an abbe number of V5, and the sixth lens element 260 has an abbe number of V6, where both (V2 ═ 23.3 and V4 ═ 23.3) are less than 27.

The following third and fourth tables are referred to in combination.

In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be calculated by matching table three and table four:

< third embodiment >

Referring to fig. 5 and fig. 6, wherein fig. 5 is a schematic diagram of an image capturing apparatus according to a third embodiment of the present invention, and fig. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment in order from left to right. As shown in fig. 5, the image capturing device of the third embodiment includes an imaging optical lens set (not labeled) and an electronic photosensitive element 390. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 300, a first lens element 310, a second lens element 320, 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, and the electro-optic sensor element 390 is disposed on the image plane 380 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (310-360), a distance is provided between any two adjacent lens elements with refractive power, and no relative movement is generated between the lens elements with refractive power.

The first lens element 310 with positive refractive power has a convex object-side surface 311 and a concave image-side surface 312.

The second lens element 320 with negative refractive power has a convex object-side surface 321 and a concave image-side surface 322.

The third lens element 330 with positive refractive power has a convex object-side surface 331 and a concave image-side surface 332.

The fourth lens element 340 with positive refractive power has a convex object-side surface 341 and a convex image-side surface 342.

The fifth lens element 350 with negative refractive power has a convex object-side surface 351 and a concave image-side surface 352. In addition, the object-side surface 351 and the image-side surface 352 of the fifth lens element have at least one inflection point, wherein the object-side surface 351 of the fifth lens element changes from convex at a paraxial region to concave at an off-axis region.

The sixth lens element 360 with negative refractive power has a concave object-side surface 361 and a concave image-side surface 362. In addition, the sixth lens element image-side surface 362 has at least one inflection point.

The ir-cut filter 370 is made of glass and disposed between the sixth lens element 360 and the image plane 380 without affecting the focal length of the imaging optical lens assembly.

In the imaging optical lens group of the third embodiment, the first lens element 310 has an abbe number of V1, the second lens element 320 has an abbe number of V2, the third lens element 330 has an abbe number of V3, the fourth lens element 340 has an abbe number of V4, the fifth lens element 350 has an abbe number of V5, and the sixth lens element 360 has an abbe number of V6, where both (V2 ═ 23.3 and V4 ═ 23.3) are less than 27.

In the imaging optical lens assembly of the third embodiment, an axial separation distance between the first lens element 310 and the second lens element 320 is T12, an axial separation distance between the second lens element 320 and the third lens element 330 is T23, an axial separation distance between the third lens element 330 and the fourth lens element 340 is T34, an axial separation distance between the fourth lens element 340 and the fifth lens element 350 is T45, and an axial separation distance between the fifth lens element 350 and the sixth lens element 360 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56. See also 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 following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived by matching table five and table six:

< fourth embodiment >

Referring to fig. 7 and 8, wherein fig. 7 is a schematic diagram of an image capturing apparatus according to a fourth embodiment of the invention, and fig. 8 is a graph of spherical aberration, astigmatism and distortion of the fourth embodiment in order from left to right. As shown in fig. 7, the image capturing device of the fourth embodiment includes an imaging optical lens set (not shown) and an electronic photosensitive element 490. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 400, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, an ir-cut filter 470 and an image plane 480, and the electro-optic element 490 is disposed on the image plane 480 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (410 and 460), a distance exists between any two adjacent lens elements with refractive power, and no relative movement exists between any two lens elements with refractive power.

The first lens element 410 with positive refractive power has a convex object-side surface 411 and a concave image-side surface 412.

The second lens element 420 with negative refractive power has a convex object-side surface 421 and a concave image-side surface 422.

The third lens element 430 with positive refractive power has a convex object-side surface 431 and a concave image-side surface 432.

The fourth lens element 440 with positive refractive power has a concave object-side surface 441 and a convex image-side surface 442.

The fifth lens element 450 with negative refractive power has a convex object-side surface 451 and a concave image-side surface 452. In addition, the object-side surface 451 of the fifth lens element has at least one inflection point, wherein the object-side surface 451 of the fifth lens element changes from convex to concave from a paraxial region to an off-axis region.

The sixth lens element 460 with negative refractive power has a concave object-side surface 461 and a convex image-side surface 462. In addition, the sixth lens object side surface 461 has at least one inflection point.

The ir-cut filter 470 is made of glass and disposed between the sixth lens element 460 and the image plane 480 without affecting the focal length of the imaging optical lens assembly.

In the imaging optical lens group according to the fourth embodiment, the first lens element 410 has an abbe number of V1, the second lens element 420 has an abbe number of V2, the third lens element 430 has an abbe number of V3, the fourth lens element 440 has an abbe number of V4, the fifth lens element 450 has an abbe number of V5, and the sixth lens element 460 has an abbe number of V6, where the three (V2-23.5, V4-21.4, and V6-21.4) are smaller than 27.

In the fourth embodiment of the present optical imaging lens assembly, an axial separation distance between the first lens element 410 and the second lens element 420 is T12, an axial separation distance between the second lens element 420 and the third lens element 430 is T23, an axial separation distance between the third lens element 430 and the fourth lens element 440 is T34, an axial separation distance between the fourth lens element 440 and the fifth lens element 450 is T45, and an axial separation distance between the fifth lens element 450 and the sixth lens element 460 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56.

See also 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 following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived by matching table seven and table eight:

< fifth embodiment >

Referring to fig. 9 and 10, fig. 9 is a schematic diagram illustrating an image capturing device according to a fifth embodiment of the invention, and fig. 10 is a graph illustrating spherical aberration, astigmatism and distortion of the fifth embodiment in order from left to right. As shown in fig. 9, the image capturing device of the fifth embodiment includes an imaging optical lens set (not numbered) and an electronic photosensitive element 590. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 500, a first lens element 510, a second lens element 520, a third lens element 530, 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, and the electro-optic element 590 is disposed on the image plane 580 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (510) and 560), a distance is provided between any two adjacent lens elements with refractive power, and no relative movement is generated between the lens elements with refractive power.

The first lens element 510 with positive refractive power has a convex object-side surface 511 and a concave image-side surface 512.

The second lens element 520 with negative refractive power has a convex object-side surface 521 and a concave image-side surface 522.

The third lens element 530 with positive refractive power has a convex object-side surface 531 and a concave image-side surface 532.

The fourth lens element 540 with negative refractive power has a concave object-side surface 541 and a convex image-side surface 542.

The fifth lens element 550 with positive refractive power has a convex object-side surface 551 and a concave image-side surface 552. In addition, the object-side surface 551 and the image-side surface 552 have at least one inflection point, and the object-side surface 551 changes from convex to concave from a paraxial region to an off-axis region.

The sixth lens element 560 with negative refractive power has a concave object-side surface 561 and a convex image-side surface 562. In addition, the sixth lens object-side surface 561 has at least one inflection point.

The ir-cut filter element 570 is made of glass, and is disposed between the sixth lens element 560 and the image plane 580 without affecting the focal length of the imaging optical lens assembly.

In addition, in the imaging optical lens assembly of the fifth embodiment, an axial distance between the first lens element 510 and the second lens element 520 is T12, an axial distance between the second lens element 520 and the third lens element 530 is T23, an axial distance between the third lens element 530 and the fourth lens element 540 is T34, an axial distance between the fourth lens element 540 and the fifth lens element 550 is T45, and an axial distance between the fifth lens element 550 and the sixth lens element 560 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56. Reference is again made 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 following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from tables nine and ten:

< sixth embodiment >

Referring to fig. 11 and 12, wherein fig. 11 is a schematic diagram illustrating an image capturing device according to a sixth embodiment of the invention, and fig. 12 is a graph illustrating spherical aberration, astigmatism and distortion in the sixth embodiment from left to right. As shown in fig. 11, the image capturing device of the sixth embodiment includes an imaging optical lens set (not labeled) and an electronic photosensitive element 690. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 600, a first lens element 610, a second lens element 620, 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, and an electro-optic device 690 is disposed on the image plane 680 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (610) and 660), a distance is provided between any two adjacent lens elements with refractive power, and no relative movement is generated between the lens elements with refractive power.

The first lens element 610 with positive refractive power has a convex object-side surface 611 and a convex image-side surface 612.

The second lens element 620 with negative refractive power has a concave object-side surface 621 and a concave image-side surface 622.

The third lens element 630 with positive refractive power has a convex object-side surface 631 and a concave image-side surface 632.

The fourth lens element 640 with negative refractive power has a concave object-side surface 641 and a convex image-side surface 642.

The fifth lens element 650 with positive refractive power has a convex object-side surface 651 and a concave image-side surface 652. In addition, the object-side surface 651 of the fifth lens element has at least one inflection point on the object-side surface 652 of the fifth lens element, wherein the object-side surface 651 of the fifth lens element changes from convex at a paraxial region to concave at an off-axial region.

The sixth lens element 660 with negative refractive power has a concave object-side surface 661 and a convex image-side surface 662. In addition, the sixth lens object-side surface 661 has at least one inflection point.

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

In the imaging optical lens group according to the sixth embodiment, the first lens element 610 has an abbe number of V1, the second lens element 620 has an abbe number of V2, the third lens element 630 has an abbe number of V3, the fourth lens element 640 has an abbe number of V4, the fifth lens element 650 has an abbe number of V5, and the sixth lens element 660 has an abbe number of V6, where both (V2 ═ 25.6 and V4 ═ 21.4) are less than 27.

In the imaging optical lens assembly of the sixth embodiment, an axial separation distance between the first lens element 610 and the second lens element 620 is T12, an axial separation distance between the second lens element 620 and the third lens element 630 is T23, an axial separation distance between the third lens element 630 and the fourth lens element 640 is T34, an axial separation distance between the fourth lens element 640 and the fifth lens element 650 is T45, and an axial separation distance between the fifth lens element 650 and the sixth lens element 660 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56.

Reference is again made 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 following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from table eleven and table twelve:

< seventh embodiment >

Referring to fig. 13 and 14, wherein fig. 13 is a schematic diagram of an image capturing apparatus according to a seventh embodiment of the invention, and fig. 14 is a graph of spherical aberration, astigmatism and distortion of the seventh embodiment sequentially from left to right. As shown in fig. 13, the image capturing device of the seventh embodiment includes an imaging optical lens assembly (not shown) and an electronic photosensitive element 790. The imaging optical lens assembly includes, in order from an object side to an image side, a first lens element 710, an aperture stop 700, a second lens element 720, a third lens element 730, a fourth lens element 740, a fifth lens element 750, a sixth lens element 760, an ir-cut filter 770 and an image plane 780, and the electro-optic sensing element 790 is disposed on the image plane 780 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (710 and 760), a distance exists between any two adjacent lens elements with refractive power, and no relative movement exists between the two lens elements with refractive power.

The first lens element 710 with positive refractive power has a convex object-side surface 711 and a convex image-side surface 712.

The second lens element 720 with negative refractive power has a concave object-side surface 721 and a concave image-side surface 722.

The third lens element 730 with negative refractive power has a convex object-side surface 731 and a concave image-side surface 732.

The fourth lens element 740 with positive refractive power has a convex object-side surface 741 and a convex image-side surface 742.

The fifth lens element 750 with negative refractive power has a convex object-side surface 751 and a concave image-side surface 752. In addition, the object-side surface 751 of the fifth lens element has at least one inflection point on the image-side surface 752, and the object-side surface 751 of the fifth lens element is convex at a paraxial region thereof to concave at an off-axis region thereof.

The sixth lens element 760 with negative refractive power has a concave object-side surface 761 and a convex image-side surface 762. In addition, the object-side surface 761 of the sixth lens element has at least one inflection point.

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 imaging optical lens assembly.

In the imaging optical lens group according to the seventh embodiment, the first lens element 710 has an abbe number of V1, the second lens element 720 has an abbe number of V2, the third lens element 730 has an abbe number of V3, the fourth lens element 740 has an abbe number of V4, the fifth lens element 750 has an abbe number of V5, and the sixth lens element 760 has an abbe number of V6, where both (V2-25.6 and V4-25.7) are smaller than 27.

In the imaging optical lens assembly of the seventh embodiment, an axial separation distance between the first lens element 710 and the second lens element 720 is T12, an axial separation distance between the second lens element 720 and the third lens element 730 is T23, an axial separation distance between the third lens element 730 and the fourth lens element 740 is T34, an axial separation distance between the fourth lens element 740 and the fifth lens element 750 is T45, and an axial separation distance between the fifth lens element 750 and the sixth lens element 760 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56.

Reference is again made to the following thirteen 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 following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from table thirteen and table fourteen:

< eighth embodiment >

Referring to fig. 15 and 16, wherein fig. 15 is a schematic diagram of an image capturing apparatus according to an eighth embodiment of the present invention, and fig. 16 is a graph illustrating spherical aberration, astigmatism and distortion of the eighth embodiment in order from left to right. As shown in fig. 15, the image capturing device of the eighth embodiment includes an imaging optical lens set (not numbered) and an electronic photosensitive element 890. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 800, a first lens element 810, a second lens element 820, a third lens element 830, a fourth lens element 840, a fifth lens element 850, a sixth lens element 860, an ir-cut filter 870 and an image plane 880, and the electro-optic device 890 is disposed on the image plane 880, wherein the imaging optical lens assembly includes six lens elements (810 and 860) having refractive power, a distance is provided between any two adjacent lens elements having refractive power, and no relative movement is generated between the two lens elements having refractive power.

The first lens element 810 with positive refractive power has a convex object-side surface 811 and a concave image-side surface 812.

The second lens element 820 with negative refractive power has a convex object-side surface 821 and a concave image-side surface 822.

The third lens element 830 with positive refractive power has a convex object-side surface 831 and a concave image-side surface 832.

The fourth lens element 840 with negative refractive power has a concave object-side surface 841 and a convex image-side surface 842.

The fifth lens element 850 with negative refractive power has a convex object-side surface 851 and a concave image-side surface 852. In addition, the object-side surface 851 and the image-side surface 852 of the fifth lens element have at least one inflection point, wherein the object-side surface 851 is convex at a paraxial region thereof to concave at an off-axis region thereof.

The sixth lens element 860 with positive refractive power has a convex object-side surface 861 and a convex image-side surface 862. In addition, the sixth lens object-side surface 861 has at least one inflection point.

The ir-cut filter 870 is made of glass and disposed between the sixth lens element 860 and the image plane 880, and does not affect the focal length of the imaging optical lens assembly.

In the imaging optical lens group according to the eighth embodiment, the first lens element 810 has an abbe number of V1, the second lens element 820 has an abbe number of V2, the third lens element 830 has an abbe number of V3, the fourth lens element 840 has an abbe number of V4, the fifth lens element 850 has an abbe number of V5, and the sixth lens element 860 has an abbe number of V6, where the three (V2 ═ 23.3, V4 ═ 23.3, and V6 ═ 23.3) are less than 27. See also table fifteen below and table sixteen.

In the eighth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the table fifteen and table sixteen:

< ninth embodiment >

Referring to fig. 17 and fig. 18, wherein fig. 17 is a schematic diagram of an image capturing apparatus according to a ninth embodiment of the invention, and fig. 18 is a graph of spherical aberration, astigmatism and distortion of the ninth embodiment in order from left to right. As shown in fig. 17, the image capturing device of the ninth embodiment includes an imaging optical lens set (not numbered) and an electronic photosensitive element 990. The imaging optical lens assembly includes, in order from an object side to an image side, a first lens element 910, an aperture stop 900, a second lens element 920, a third lens element 930, a fourth lens element 940, a fifth lens element 950, a sixth lens element 960, an ir-cut filter element 970 and an image plane 980, and the electro-optic element 990 is disposed on the image plane 980 of the imaging optical lens assembly, wherein the imaging optical lens assembly includes six lens elements (910 and 960), a distance is provided between any two adjacent lens elements with refractive power, and no relative movement is provided between any two lens elements with refractive power.

The first lens element 910 with positive refractive power has a convex object-side surface 911 and a concave image-side surface 912.

The second lens element 920 with negative refractive power has a convex object-side surface 921 and a concave image-side surface 922.

The third lens element 930 with positive refractive power has a convex object-side surface 931 and a concave image-side surface 932.

The fourth lens element 940 with positive refractive power has a concave object-side surface 941 and a convex image-side surface 942.

The fifth lens element 950 with negative refractive power has a convex object-side surface 951 and a concave image-side surface 952. In addition, the object-side surface 951 and the image-side surface 952 both have at least one inflection point, and the object-side surface 951 changes from convex at a paraxial region to concave at an off-axis region.

The sixth lens element 960 with negative refractive power has a concave object-side surface 961 and a convex image-side surface 962.

The ir-cut filter 970 is made of glass material, and is disposed between the sixth lens element 960 and the image plane 980 without affecting the focal length of the imaging optical lens assembly.

In the imaging optical lens group according to the ninth embodiment, the first lens element 910 has an abbe number of V1, the second lens element 920 has an abbe number of V2, the third lens element 930 has an abbe number of V3, the fourth lens element 940 has an abbe number of V4, the fifth lens element 950 has an abbe number of V5, and the sixth lens element 960 has an abbe number of V6, where both (V2 ═ 23.3 and V4 ═ 23.3) are less than 27.

In the imaging optical lens assembly of the ninth embodiment, an axial separation distance between the first lens element 910 and the second lens element 920 is T12, an axial separation distance between the second lens element 920 and the third lens element 930 is T23, an axial separation distance between the third lens element 930 and the fourth lens element 940 is T34, an axial separation distance between the fourth lens element 940 and the fifth lens element 950 is T45, and an axial separation distance between the fifth lens element 950 and the sixth lens element 960 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56.

Further, reference is made to the seventeenth and eighteen tables below.

In the ninth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the seventeenth and eighteen tables:

< tenth embodiment >

Referring to fig. 10 and 20, fig. 19 is a schematic diagram of an image capturing apparatus according to a tenth embodiment of the invention, and fig. 20 is a graph of spherical aberration, astigmatism and distortion of the tenth embodiment in order from left to right. As shown in fig. 19, the image capturing apparatus of the tenth embodiment includes an imaging optical lens set (not labeled) and an electronic photosensitive element 1090. The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop 1000, a first lens element 1010, a second lens element 1020, a third lens element 1030, a fourth lens element 1040, a fifth lens element 1050, a sixth lens element 1060, an ir-cut filter element 1070 and an image plane 1080, and the electro-optic element 1090 is disposed on the image plane 1080 of the imaging optical lens assembly, wherein the number of the lens elements with refractive power in the imaging optical lens assembly is six (1010-1060), a distance exists between any two adjacent lens elements with refractive power, and no relative movement exists between the lens elements with refractive power.

The first lens element 1010 with positive refractive power has a convex object-side surface 1011 and a convex image-side surface 1012.

The second lens element 1020 with negative refractive power has a concave object-side surface 1021 and a concave image-side surface 1022.

The third lens element 1030 with negative refractive power has a concave object-side surface 1031 and a convex image-side surface 1032.

The fourth lens element 1040 with positive refractive power has a concave object-side surface 1041 and a convex image-side surface 1042.

The fifth lens element 1050 with positive refractive power has a convex object-side surface 1051 and a concave image-side surface 1052. In addition, the object-side surface 1051 and the image-side surface 1052 each have at least one inflection point, and the object-side surface 1051 changes from convex at a paraxial region to concave at an off-axis region.

The sixth lens element 1060 with negative refractive power has a concave object-side surface 1061 and a concave image-side surface 1062. In addition, the sixth lens image-side surface 1062 has at least one inflection point.

The ir-cut filter 1070 is made of glass and disposed between the sixth lens element 1060 and the imaging plane 1080 without affecting the focal length of the imaging optical lens assembly.

In the imaging optical lens group according to the tenth embodiment, the first lens element 1010 has an abbe number of V1, the second lens element 1020 has an abbe number of V2, the third lens element 1030 has an abbe number of V3, the fourth lens element 1040 has an abbe number of V4, the fifth lens element 1050 has an abbe number of V5, and the sixth lens element 1060 has an abbe number of V6, where the three (V2-23.3, V4-23.3, and V6-23.3) are smaller than 27.

In the imaging optical lens assembly of the tenth embodiment, an axial separation distance between the first lens element 1010 and the second lens element 1020 is T12, an axial separation distance between the second lens element 1020 and the third lens element 1030 is T23, an axial separation distance between the third lens element 1030 and the fourth lens element 1040 is T34, an axial separation distance between the fourth lens element 1040 and the fifth lens element 1050 is T45, and an axial separation distance between the fifth lens element 1050 and the sixth lens element 1060 is T56, which satisfy the following conditions: 0< T12< T23< T56; 0< T12< T34< T56; 0< T45< T23< T56; and 0< T45< T34< T56.

Further reference is made to the following nineteen and twenty tables.

In the tenth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the nineteen and twenty tables:

< eleventh embodiment >

Fig. 22 is a schematic diagram illustrating an electronic device 10 according to an eleventh embodiment of the invention. The electronic device 10 of the eleventh embodiment is a smart phone, wherein the electronic device 10 includes an image capturing device 11, and the image capturing device 11 includes an imaging optical lens assembly (not shown) and an electronic photosensitive element (not shown), wherein the electronic photosensitive element is disposed on an image plane of the imaging optical lens assembly.

< twelfth embodiment >

Fig. 23 is a schematic view illustrating an electronic device 20 according to a twelfth embodiment of the invention. The electronic device 20 of the twelfth embodiment is a tablet personal computer, and the electronic device 20 includes an image capturing device 21, and the image capturing device 21 includes an imaging optical lens assembly (not shown) and an electronic photosensitive element (not shown) according to the invention, wherein the electronic photosensitive element is disposed on an image plane of the imaging optical lens assembly.

< thirteenth embodiment >

Fig. 24 is a schematic view illustrating an electronic device 30 according to a thirteenth embodiment of the invention. The electronic device 30 of the thirteenth embodiment is a Head-mounted display (HMD), and the electronic device 30 includes an image capturing device 31, where the image capturing device 31 includes an imaging optical lens assembly (not shown) and an electronic photosensitive element (not shown) according to the invention, where the electronic photosensitive element is disposed on an image plane of the imaging optical lens assembly.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An imaging optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with a convex object-side surface, a third lens element with negative refractive power, a fourth lens element with negative refractive power, a fifth lens element with negative refractive power, and a sixth lens element with at least one inflection point on at least one surface thereof;

wherein, the lens in the imaging optical lens assembly is six, at least four of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of plastic, the focal length of the imaging optical lens assembly is f, the maximum image height of the imaging optical lens assembly is ImgH, the distance between the object side surface of the first lens and an imaging surface on the optical axis is TL, and the following conditions are satisfied:

2.0< f/ImgH is less than or equal to 3.18; and

0.70<TL/f<1.0。

2. the imaging optical lens assembly of claim 1, wherein the image-side surface of the second lens element is concave and the image-side surface of the fifth lens element is concave.

3. The imaging optical lens assembly of claim 1, wherein the fourth lens element has an abbe number of V4 satisfying the following condition:

V4<30。

4. the imaging optical lens assembly of claim 1, wherein the focal length of the imaging optical lens assembly is f, and the radius of curvature of the object-side surface of the first lens element is R1, which satisfies the following condition:

3.0<f/R1。

5. the imaging optical lens assembly of claim 1, wherein the object-side surface of the second lens element is convex.

6. The imaging optical lens assembly of claim 1 wherein a separation distance exists between any two adjacent lenses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element, wherein half of the maximum field of view of the imaging optical lens assembly is HFOV, which satisfies the following condition:

7.5 degrees < HFOV <23.5 degrees.

7. The imaging optical lens assembly of claim 1, wherein the refractive index of the first lens element is N1, the refractive index of the second lens element is N2, the refractive index of the third lens element is N3, the refractive index of the fourth lens element is N4, the refractive index of the fifth lens element is N5, and the refractive index of the sixth lens element is N6, wherein the largest of the refractive indices is Nmax, which satisfies the following condition:

Nmax<1.70。

8. the imaging optical lens assembly of claim 1, wherein the object-side surface of the fifth lens element changes from convex to concave from paraxial to off-axis.

9. The imaging optical lens assembly of claim 1, wherein the first lens element has an abbe number of V1, the second lens element has an abbe number of V2, the third lens element has an abbe number of V3, the fourth lens element has an abbe number of V4, the fifth lens element has an abbe number of V5, and the sixth lens element has an abbe number of V6, at least two of which are smaller than 27.

10. An image capturing device, comprising:

the imaging optical lens assembly of claim 1; and

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

11. An imaging optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with a convex object-side surface and a concave image-side surface, a third lens element with negative refractive power, a fourth lens element with negative refractive power, a fifth lens element with negative refractive power, and a sixth lens element with at least one inflection point on at least one of the surfaces of the fifth and sixth lens elements;

2.0< f/ImgH; and

0.70<TL/f<1.0。

12. the imaging optical lens assembly of claim 11, wherein the image-side surface of the second lens element is concave and the image-side surface of the fifth lens element is concave.

13. The imaging optical lens assembly of claim 11, wherein the fourth lens element has an abbe number V4 satisfying the following condition:

V4<30。

14. the imaging optical lens assembly of claim 11, wherein the focal length of the imaging optical lens assembly is f, and the radius of curvature of the object-side surface of the first lens element is R1, which satisfies the following condition:

3.0<f/R1。

15. the imaging optical lens assembly of claim 11, wherein the object-side surface of the second lens element is convex.

16. The imaging optical lens assembly of claim 11 wherein a separation distance exists between any two adjacent lenses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element, wherein half of the maximum field of view of the imaging optical lens assembly is HFOV, which satisfies the following condition:

7.5 degrees < HFOV <23.5 degrees.

17. The imaging optical lens assembly of claim 11, wherein the refractive index of the first lens element is N1, the refractive index of the second lens element is N2, the refractive index of the third lens element is N3, the refractive index of the fourth lens element is N4, the refractive index of the fifth lens element is N5, and the refractive index of the sixth lens element is N6, wherein the maximum of the refractive indices is Nmax, which satisfies the following condition:

Nmax<1.70。

18. the imaging optical lens assembly of claim 11, wherein the object-side surface of the fifth lens element changes from convex to concave from paraxial to off-axis.

19. The imaging optical lens assembly of claim 11, wherein the first lens element has an abbe number of V1, the second lens element has an abbe number of V2, the third lens element has an abbe number of V3, the fourth lens element has an abbe number of V4, the fifth lens element has an abbe number of V5, and the sixth lens element has an abbe number of V6, at least two of which are smaller than 27.

20. An image capturing device, comprising:

the imaging optical lens assembly of claim 11; and

21. An imaging optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with a convex object-side surface, a third lens element with negative refractive power, a fourth lens element with negative refractive power, a fifth lens element with negative refractive power, and a sixth lens element with at least one inflection point on at least one surface thereof;

2.0<f/ImgH；

0.70< TL/f < 1.0; and

2.0<TL/ImgH<3.0。

22. the imaging optical lens assembly of claim 21, wherein the image-side surface of the second lens element is concave and the image-side surface of the fifth lens element is concave.

23. The imaging optical lens assembly of claim 21, wherein the fourth lens element has an abbe number V4 satisfying the following condition:

V4<30。

24. the imaging optical lens assembly of claim 21, wherein the focal length of the imaging optical lens assembly is f, and the radius of curvature of the object-side surface of the first lens element is R1, which satisfies the following condition:

3.0<f/R1。

25. the imaging optical lens assembly of claim 21, wherein the object-side surface of the second lens element is convex.

26. The imaging optical lens assembly of claim 21 wherein a separation distance exists between any two adjacent lenses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element, wherein half of the maximum field of view of the imaging optical lens assembly is HFOV, which satisfies the following condition:

7.5 degrees < HFOV <23.5 degrees.

27. The imaging optical lens assembly of claim 21, wherein the refractive index of the first lens element is N1, the refractive index of the second lens element is N2, the refractive index of the third lens element is N3, the refractive index of the fourth lens element is N4, the refractive index of the fifth lens element is N5, and the refractive index of the sixth lens element is N6, wherein the maximum of the refractive indices is Nmax, which satisfies the following condition:

Nmax<1.70。

28. the imaging optical lens assembly of claim 21, wherein the object-side surface of the fifth lens element changes from convex to concave from paraxial to off-axis.

29. The imaging optical lens assembly of claim 21, wherein the first lens element has an abbe number of V1, the second lens element has an abbe number of V2, the third lens element has an abbe number of V3, the fourth lens element has an abbe number of V4, the fifth lens element has an abbe number of V5, and the sixth lens element has an abbe number of V6, at least two of which are smaller than 27.

30. An image capturing device, comprising:

the imaging optical lens assembly of claim 21; and