Imaging lens assembly, image capturing unit and electronic device

An imaging lens assembly includes a total of six lens elements which are, 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 positive refractive power. The second lens element has negative refractive power. The fifth lens element has negative refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 108129280, filed on Aug. 16, 2019, which is incorporated by reference herein in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to an imaging lens assembly, an image capturing unit and an electronic device, more particularly to an imaging lens assembly and an image capturing unit applicable to an electronic device.

Description of Related Art

For various applications, high quality optical systems have been applied to different kinds of electronic devices, such as vehicle devices, image recognition systems, entertainment devices, sport devices and intelligent home assistance systems. In order to provide wider applications, electronic devices equipped with one or more optical systems have become the mainstream product in the market, and the optical systems are developed with various optical characteristics according to different requirements.

In recent years, there is an increasing demand for electronic devices featuring compact size, and thus conventional optical systems, especially the optical systems featuring a large aperture or telephoto, are difficult to be applied to the electronic devices with high-end specification and compact size. The shortcomings of the conventional telephoto optical systems are overly long total track length, low image quality and large size. Therefore, there is a need to develop a telephoto optical system featuring compact size and high image quality with reduced size in a specific direction or capability of changing the direction of the optical axis.

SUMMARY

According to one aspect of the present disclosure, an imaging lens assembly includes a total of six lens elements. The six lens elements are, 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 positive refractive power. The second lens element has negative refractive power. The fifth lens element has negative refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof.

When a focal length of the second lens element is f2, a focal length of the third lens element is f3, an axial distance between an object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, and an axial distance between the image-side surface of the sixth lens element and an image surface is BL, the following conditions are satisfied:
|f3/f2|<3.0; and
0.50<Td/BL<1.60.

According to another aspect of the present disclosure, an imaging lens assembly includes a total of six lens elements. The six lens elements are, 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 positive refractive power. The second lens element has negative refractive power. The fifth lens element has negative refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof.

When a focal length of the imaging lens assembly is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and a total number of lens elements having an Abbe number smaller than 30 in the imaging lens assembly is V30, the following conditions are satisfied:
|f3/f2|<3.0;
9.25<|f/f1|+|f/f2|+|f/f3|+|f/f4|+|f/f5|+|f/f6|; and
2≤V30.

According to another aspect of the present disclosure, an image capturing unit includes one of the aforementioned imaging lens assemblies and an image sensor, wherein the image sensor is disposed on the image surface of the imaging lens assembly.

According to another aspect of the present disclosure, an electronic device includes at least three image capturing units which face in the same direction and include the aforementioned image capturing unit. Maximum fields of view of the at least three image capturing units are different from one another, and the largest value and the smallest value of the maximum fields of view of the at least three image capturing units differ by at least 50 degrees.

DETAILED DESCRIPTION

An imaging lens assembly includes a total of six lens elements. The six lens elements are, 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 positive refractive power. Therefore, it is favorable for effectively miniaturizing the imaging lens assembly.

The second lens element has negative refractive power. Therefore, it is favorable for providing good image quality when correcting chromatic aberration in combination with the first lens element.

The third lens element can have negative refractive power. Therefore, it is favorable for effectively correcting aberrations so as to ensure good image quality.

The fifth lens element has negative refractive power. Therefore, it is favorable for further correcting high order aberrations. The fifth lens element can have an image-side surface being concave in a paraxial region thereof and having at least one convex critical point in an off-axis region thereof. Therefore, it is favorable for correcting aberrations in the peripheral region and improving the overall image quality. Please refer toFIG. 36, which shows a schematic view of the convex critical point C of the image-side surface152of the fifth lens element150according to the 1st embodiment of the present disclosure. The convex critical point on the image-side surface of the fifth lens element inFIG. 36is only exemplary. There may also be one or more critical points in an off-axis region among the lens surfaces of the six lens elements.

The sixth lens element can have positive refractive power. Therefore, it is favorable for controlling light converging capability and providing a proper back focal length. The sixth lens element can have an image-side surface being concave in a paraxial region thereof. Therefore, it is favorable for moving the principal point toward the object side so as to achieve the requirement of compactness. The image-side surface of the sixth lens element can have at least one concave shape in an off-axis region thereof. Therefore, it is favorable for correcting aberrations in the peripheral region and improving the overall image quality.

According to the present disclosure, at least one lens element of the imaging lens assembly can be made of glass material. Therefore, it is favorable for effectively reducing the sensitivity of the imaging lens assembly to the environmental factors so as to provide consistent image quality in various environments. Moreover, at least one of the third lens element and the fourth lens element can be made of glass material.

According to the present disclosure, at least one lens element of the imaging lens assembly can have at least two trimmed edges at an outer diameter position thereof. Therefore, it is favorable for reducing one axial dimension of any single lens element so as to further miniaturize the imaging lens assembly. Moreover, at least one lens element can also have at least four trimmed edges at the outer diameter position thereof. Moreover, each of at least two lens elements can also have at least two trimmed edges at an outer diameter position thereof. Please refer toFIG. 19andFIG. 21.FIG. 19shows a schematic view of the two trimmed edges1021and1022at the outer diameter position of the second lens element1020according to the 10th embodiment of the present disclosure, andFIG. 21shows a schematic view of the four trimmed edges1111,1112,1113and1114at the outer diameter position of the first lens element1110according to the 11th embodiment of the present disclosure.

According to the present disclosure, the imaging lens assembly can further include a reflector. The reflector is, for example, a reflective mirror or a prism. Therefore, it is favorable for changing the direction of the optical axis so as to provide a sufficient total track length of the imaging lens assembly with a better telephoto configuration, thereby achieving compactness. Moreover, the reflector can be disposed on the object side of the first lens element. Please refer toFIG. 32andFIG. 33.FIG. 32shows a schematic view of a configuration of a reflector REF and the imaging lens assembly according to the 18th embodiment of the present disclosure in an electronic device, andFIG. 33shows a schematic view of an enlarged configuration of the reflector REF and the imaging lens assembly inFIG. 32.

When a focal length of the second lens element is f2, and a focal length of the third lens element is f3, the following condition is satisfied: |f3/f2|<3.0. Therefore, it is favorable for ensuring sufficient refractive power at the central position so as to balance the lens element having relatively strong refractive power on the object side, thereby facilitating to correct aberrations while increasing incident light and brightness. Moreover, the following condition can also be satisfied: |f3/f2|<2.0. Moreover, the following condition can also be satisfied: |f3/f2|<1.50. Moreover, the following condition can also be satisfied: |f3/f2|<1.0.

When an axial distance between an object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, and an axial distance between the image-side surface of the sixth lens element and an image surface is BL, the following condition can be satisfied: 0.50<Td/BL<1.60. Therefore, it is favorable for providing a sufficient back focal length so as to install the reflector for telephoto functions or other components for various applications. Moreover, the following condition can also be satisfied: 0.60<Td/BL<1.25.

When a focal length of the imaging lens assembly is f, a 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, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and a focal length of the sixth lens element is f6, the following condition can be satisfied: 8.0<|f/f1|+|f/f2|+|f/f3|+|f/f4|+|f/f5|+|f/f6|. Therefore, it is favorable for ensuring sufficient refractive power so as to achieve compactness of the imaging lens assembly. Moreover, the following condition can also be satisfied: 9.25<|f/f1|+|f/f2|+|f/f3|+|f/f4|+|f/f5|+|f/f6|. Moreover, the following condition can also be satisfied: 10<|f/f1|+1f/f2|+1f/f3|+1f/f4|+1f/f5|+1f/f6|<15.

When the total number of lens elements having an Abbe number smaller than 30 in the imaging lens assembly is V30, the following condition can be satisfied: 2≤V30. Therefore, it is favorable for balancing corrections of chromatic aberration and astigmatism. Moreover, the following condition can also be satisfied: 3≤V30.

When an axial distance between the object-side surface of the first lens element and the image surface is TL, and the focal length of the imaging lens assembly is f, the following condition can be satisfied: 0.75<TL/f≤1.0. Therefore, it is favorable for ensuring a better miniaturized telephoto configuration.

When the axial distance between the object-side surface of the first lens element and the image surface is TL, and a maximum image height of the imaging lens assembly (half of a diagonal length of an effective photosensitive area of an image sensor) is ImgH, the following condition can be satisfied: TL/ImgH<7.0. Therefore, it is favorable for providing a proper field of view in a telephoto.

When the focal length of the third lens element is f3, and the focal length of the fifth lens element is f5, the following condition can be satisfied: |f5/f3|<5.0. Therefore, it is favorable for balancing the object side and the image side with sufficient refractive power, thereby improving relative illuminance in the peripheral region. Moreover, the following condition can also be satisfied: |f5/f3|<3.0. Moreover, the following condition can also be satisfied: |f5/f3|<2.0.

When an axial distance between the object-side surface of the first lens element and an object-side surface of the third lens element is Dr1r5, and an axial distance between an image-side surface of the fourth lens element and the image-side surface of the sixth lens element is Dr8r12, the following condition can be satisfied: 0.75<Dr1r5/Dr8r12<2.50. Therefore, it is favorable for ensuring sufficient space to properly allocate the lens elements so as to better balance the weight distribution of the imaging lens assembly. Moreover, the following condition can also be satisfied: 0.80<Dr1r5/Dr8r12<1.75.

When an Abbe number of the sixth lens element is V6, the following condition can be satisfied: V6≤24. Therefore, it is favorable for further correcting chromatic aberration.

When the focal length of the imaging lens assembly is f, the following condition can be satisfied: 10 [mm]<f<20 [mm]. Therefore, it is favorable for facilitating compactness of the imaging lens assembly.

When half of a maximum field of view of the imaging lens assembly is HFOV, the following condition can be satisfied: 0 [deg.]<HFOV<18 [deg.]. Therefore, it is favorable for capturing details of smaller objects from afar so as to achieve the telephoto function. Moreover, the following condition can also be satisfied: 5 [deg.]<HFOV<15 [deg.].

When the axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, the following condition can be satisfied: 5 [mm]<Td<10 [mm]. Therefore, it is favorable for controlling the total track length and compactness of the imaging lens assembly.

When an f-number of the imaging lens assembly is Fno, the following condition can be satisfied: 1.5<Fno<4.0. Therefore, it is favorable for providing a large aperture configuration so as to increase the amount of incident light against the brightness decay caused by the reflector.

When an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, an Abbe number of the i-th lens element is V1, a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the fifth lens element is N5, a refractive index of the sixth lens element is N6, and a refractive index of the i-th lens element is N1, at least one lens element of the imaging lens assembly can satisfy the following condition: 5<Vi/Ni<12, wherein i=1, 2, 3, 4, 5, or 6. Therefore, it is favorable for balancing corrections of chromatic aberration and astigmatism while reducing the effective radius and surface diameter of each lens element so as to further miniaturize the imaging lens assembly. Moreover, at least one lens element of the imaging lens assembly can also satisfy the following condition: 6<Vi/Ni<11.2, wherein i=1, 2, 3, 4, 5, or 6. Moreover, at least two lens element of the imaging lens assembly can also satisfy the following condition: 5<Vi/Ni<12, wherein i=1, 2, 3, 4, 5, or 6. Moreover, at least two lens element of the imaging lens assembly can also satisfy the following condition: 5<Vi/Ni<11.8, wherein i=1, 2, 3, 4, 5, or 6.

When a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and a central thickness of the sixth lens element is CT6, the following conditions can be satisfied: 1.0<CT1/CT2; 1.0<CT1/CT3; 1.0<CT1/CT4; 1.0<CT1/CT5; and 1.0<CT1/CT6. Therefore, it is favorable for ensuring a sufficient thickness and structural strength of the first lens element with the lens barrel having a small opening so as to achieve miniaturization as a telephoto. Moreover, the following conditions can also be satisfied: 1.25<CT1/CT2; 1.25<CT1/CT3; 1.25<CT1/CT4; 1.25<CT1/CT5; and 1.25<CT1/CT6.

When a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of an image-side surface of the first lens element is Y12, a maximum effective radius of an object-side surface of the second lens element is Y21, a maximum effective radius of an image-side surface of the second lens element is Y22, a maximum effective radius of the object-side surface of the third lens element is Y31, a maximum effective radius of an image-side surface of the third lens element is Y32, a maximum effective radius of an object-side surface of the fourth lens element is Y41, a maximum effective radius of the image-side surface of the fourth lens element is Y42, a maximum effective radius of an object-side surface of the fifth lens element is Y51, a maximum effective radius of the image-side surface of the fifth lens element is Y52, a maximum effective radius of an object-side surface of the sixth lens element is Y61, and a maximum effective radius of the image-side surface of the sixth lens element is Y62, the following conditions can be satisfied: 1.0<Y11/Y12; 1.0<Y11/Y21; 1.0<Y11/Y22; 1.0<Y11/Y31; 1.0<Y11/Y32; 1.0<Y11/Y41; 1.0<Y11/Y42; 1.0<Y11/Y51; 1.0<Y11/Y52; 1.0<Y11/Y61; and 1.0<Y11/Y62. Therefore, it is favorable for utilizing a larger optical effective region on the object side to increase the amount of incident light so as to compensate brightness decay caused by a reflector. Please refer toFIG. 36, which shows a schematic view of Y11, Y12, Y21, Y22, Y31, Y32, Y41, Y42, Y51, Y52, Y61 and Y62 according to the 1st embodiment of the present disclosure.

When a maximum value among refractive indices of all lens elements of the imaging lens assembly is Nmax, the following condition can be satisfied: Nmax<1.75. Therefore, it is favorable for improving aberration corrections while reducing the effective radius and surface diameter of each lens element so as to further miniaturize the imaging lens assembly. Moreover, the following condition can also be satisfied: Nmax≤1.72. Moreover, the following condition can also be satisfied: 1.66<Nmax≤1.72.

When a minimum value among Abbe numbers of all lens elements of the imaging lens assembly is Vmin, the following condition can be satisfied: Vmin<24. Therefore, it is favorable for correcting chromatic aberration so as to improve image quality. Moreover, the following condition can also be satisfied: Vmin<21. Moreover, the following condition can also be satisfied: 12<Vmin<21.

When the focal length of the imaging lens assembly is f, and a curvature radius of the object-side surface of the first lens element is R1, the following condition can be satisfied: 3.50<f/R1. Therefore, it is favorable for ensuring sufficient refractive power of the first lens element so as to reduce the total track length. Moreover, the following condition can also be satisfied: 4.0<f/R1.

When a sum of axial distances between each of all adjacent lens elements of the imaging lens assembly is ΣAT, and an axial distance between the fourth lens element and the fifth lens element is T45, the following condition can be satisfied: 1.0<ΣAT/T45<2.0. Therefore, it is favorable for properly allocating the lens elements so as to better balance the weight distribution of the imaging lens assembly.

In the case of at least one lens element having at least two trimmed edges at the outer diameter position thereof, when twice of a minimum distance from a center to the outer diameter position of the at least one lens element (e.g., the shortest outer diameter) is LRmin, and twice of a maximum distance from the center to the outer diameter position of the at least one lens element (e.g., the longest outer diameter) is LRmax, the following condition can be satisfied: LRmin/LRmax<0.90. Therefore, it is favorable for reducing one axial dimension of any single lens element so as to further miniaturize the imaging lens assembly. Moreover, the following condition can also be satisfied: 0.50<LRmin/LRmax<0.85. Please refer toFIG. 20andFIG. 22.FIG. 20shows a schematic view of LRmin and LRmax according to the 10th embodiment of the present disclosure, andFIG. 22shows a schematic view of LRmin and LRmax according to the 11th embodiment of the present disclosure.

When the focal length of the first lens element is f1, and the focal length of the second lens element is f2, the following condition can be satisfied: |f1/f2|<1.0. Therefore, it is favorable for ensuring sufficient refractive power of the first lens element so as to control the total track length. Moreover, the following condition can also be satisfied: |f1/f2|<0.75.

According to the present disclosure, the aforementioned features and conditions can be utilized in numerous combinations so as to achieve corresponding effects.

According to the present disclosure, the lens elements of the imaging lens assembly can be made of either glass or plastic material. When the lens elements are made of glass material, the refractive power distribution of the imaging lens assembly may be more flexible, and the influence on imaging caused by external environment temperature change may be reduced. The glass lens element can either be made by grinding or molding. When the lens elements are made of plastic material, the manufacturing costs can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be spherical or aspheric, wherein the former reduces manufacturing difficulty, and the latter allows more control variables for eliminating aberrations thereof, the required number of the lens elements can be reduced, and the total track length of the imaging lens assembly can be effectively shortened. Furthermore, the aspheric surfaces may be formed by plastic injection molding or glass molding.

According to the present disclosure, when a lens surface is aspheric, it means that the lens surface has an aspheric shape throughout its optically effective area, or a portion(s) thereof.

According to the present disclosure, one or more of the lens elements' material may optionally include an additive which alters the lens elements' transmittance in a specific range of wavelength for a reduction in unwanted stray light or colour deviation. For example, the additive may optionally filter out light in the wavelength range of 600 nm to 800 nm to reduce excessive red light and/or near infrared light; or may optionally filter out light in the wavelength range of 350 nm to 450 nm to reduce excessive blue light and/or near ultraviolet light from interfering the final image. The additive may be homogeneously mixed with a plastic material to be used in manufacturing a mixed-material lens element by injection molding.

According to the present disclosure, each of an object-side surface and an image-side surface has a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axis region refers to the region of the surface away from the paraxial region. Particularly, unless otherwise stated, when the lens element has a convex surface, it indicates that the surface is convex in the paraxial region thereof; when the lens element has a concave surface, it indicates that the surface is concave in the paraxial region thereof. Moreover, when a region of refractive power or focus of a lens element is not defined, it indicates that the region of refractive power or focus of the lens element is in the paraxial region thereof.

According to the present disclosure, a critical point is a non-axial point of the lens surface where its tangent is perpendicular to the optical axis.

According to the present disclosure, the image surface of the imaging lens assembly, based on the corresponding image sensor, can be flat or curved, especially a curved surface being concave facing towards the object side of the imaging lens assembly.

According to the present disclosure, an image correction unit, such as a field flattener, can be optionally disposed between the lens element closest to the image side of the imaging lens assembly and the image surface for correction of aberrations such as field curvature. The optical properties of the image correction unit, such as curvature, thickness, index of refraction, position and surface shape (convex or concave surface with spherical, aspheric, diffractive or Fresnel types), can be adjusted according to the design of the image capturing unit. In general, a preferable image correction unit is, for example, a thin transparent element having a concave object-side surface and a planar image-side surface, and the thin transparent element is disposed near the image surface.

According to the present disclosure, the imaging lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop. Said glare stop or said field stop is set for eliminating the stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configured as a front stop or a middle stop. A front stop disposed between an imaged object and the first lens element can provide a longer distance between an exit pupil of the imaging lens assembly and the image surface to produce a telecentric effect, and thereby improves the image-sensing efficiency of an image sensor (for example, CCD or CMOS). A middle stop disposed between the first lens element and the image surface is favorable for enlarging the viewing angle of the imaging lens assembly and thereby provides a wider field of view for the same.

According to the present disclosure, the imaging lens assembly can include an aperture control unit. The aperture control unit may be a mechanical component or a light modulator, which can control the size and shape of the aperture through electricity or electrical signals. The mechanical component can include a movable member, such as a blade assembly or a light baffle. The light modulator can include a shielding element, such as a filter, an electrochromic material or a liquid-crystal layer. The aperture control unit controls the amount of incident light or exposure time to enhance the capability of image quality adjustment. In addition, the aperture control unit can be the aperture stop of the present disclosure, which changes the f-number to obtain different image effects, such as the depth of field or lens speed.

FIG. 1is a schematic view of an image capturing unit according to the 1st embodiment of the present disclosure.FIG. 2shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 1st embodiment. InFIG. 1, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor190. The imaging lens assembly includes, in order from an object side to an image side, a stop101, a first lens element110, a second lens element120, a third lens element130, an aperture stop100, a fourth lens element140, a fifth lens element150, a stop102, a sixth lens element160, a glass element170and an image surface180. The imaging lens assembly includes six lens elements (110,120,130,140,150and160) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element110with positive refractive power has an object-side surface111being convex in a paraxial region thereof and an image-side surface112being convex in a paraxial region thereof. The first lens element110is made of plastic material and has the object-side surface111and the image-side surface112being both aspheric.

The second lens element120with negative refractive power has an object-side surface121being concave in a paraxial region thereof and an image-side surface122being concave in a paraxial region thereof. The second lens element120is made of plastic material and has the object-side surface121and the image-side surface122being both aspheric.

The third lens element130with negative refractive power has an object-side surface131being convex in a paraxial region thereof and an image-side surface132being concave in a paraxial region thereof. The third lens element130is made of plastic material and has the object-side surface131and the image-side surface132being both aspheric.

The fourth lens element140with positive refractive power has an object-side surface141being convex in a paraxial region thereof and an image-side surface142being convex in a paraxial region thereof. The fourth lens element140is made of plastic material and has the object-side surface141and the image-side surface142being both aspheric.

The fifth lens element150with negative refractive power has an object-side surface151being concave in a paraxial region thereof and an image-side surface152being concave in a paraxial region thereof. The fifth lens element150is made of plastic material and has the object-side surface151and the image-side surface152being both aspheric. The image-side surface152of the fifth lens element150has at least one convex critical point in an off-axis region thereof.

The sixth lens element160with positive refractive power has an object-side surface161being convex in a paraxial region thereof and an image-side surface162being concave in a paraxial region thereof. The sixth lens element160is made of plastic material and has the object-side surface161and the image-side surface162being both aspheric. The image-side surface162of the sixth lens element160has at least one concave shape in an off-axis region thereof.

The glass element170is made of glass material and located between the sixth lens element160and the image surface180, and will not affect the focal length of the imaging lens assembly. The image sensor190is disposed on or near the image surface180of the imaging lens assembly.

X is the relative distance between a point on the aspheric surface spaced at a distance Y from an optical axis and the tangential plane at the aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to the optical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be, but is not limited to, 4, 6, 8, 10, 12, 14, 16 and 18.

In the imaging lens assembly of the image capturing unit according to the 1st embodiment, when a focal length of the imaging lens assembly is f, an f-number of the imaging lens assembly is Fno, and half of a maximum field of view of the imaging lens assembly is HFOV, these parameters have the following values: f=14.55 millimeters (mm), Fno=3.00, HFOV=9.7 degrees (deg.).

When an Abbe number of the sixth lens element160is V6, the following condition is satisfied: V6=19.5.

When an Abbe number of the first lens element110is V1, and a refractive index of the first lens element110is N1, the following condition is satisfied: V1/N1=36.26.

When an Abbe number of the second lens element120is V2, and a refractive index of the second lens element120is N2, the following condition is satisfied: V2/N2=17.83.

When an Abbe number of the third lens element130is V3, and a refractive index of the third lens element130is N3, the following condition is satisfied: V3/N3=17.83.

When an Abbe number of the fourth lens element140is V4, and a refractive index of the fourth lens element140is N4, the following condition is satisfied: V4/N4=36.26.

When an Abbe number of the fifth lens element150is V5, and a refractive index of the fifth lens element150is N5, the following condition is satisfied: V5/N5=19.11.

When the Abbe number of the sixth lens element160is V6, and a refractive index of the sixth lens element160is N6, the following condition is satisfied: V6/N6=11.65.

When the total number of lens elements having an Abbe number smaller than 30 in the imaging lens assembly is V30, the following condition is satisfied: V30=3.

When a minimum value among Abbe numbers of all lens elements of the imaging lens assembly is Vmin, the following condition is satisfied: Vmin=19.5. In this embodiment, among the first lens element110, the second lens element120, the third lens element130, the fourth lens element140, the fifth lens element150and the sixth lens element160, the Abbe number of the sixth lens element160is smaller than the Abbe numbers of the other lens elements, and Vmin is equal to the Abbe number of the sixth lens element160.

When a maximum value among refractive indices of all lens elements of the imaging lens assembly is Nmax, the following condition is satisfied: Nmax=1.669. In this embodiment, among the first lens element110, the second lens element120, the third lens element130, the fourth lens element140, the fifth lens element150and the sixth lens element160, the refractive index of the sixth lens element160is larger than the refractive indices of the other lens elements, and Nmax is equal to the refractive index of the sixth lens element160.

When a central thickness of the first lens element110is CT1, and a central thickness of the second lens element120is CT2, the following condition is satisfied: CT1/CT2=5.58.

When the central thickness of the first lens element110is CT1, and a central thickness of the third lens element130is CT3, the following condition is satisfied: CT1/CT3=6.84.

When the central thickness of the first lens element110is CT1, and a central thickness of the fourth lens element140is CT4, the following condition is satisfied: CT1/CT4=1.20.

When the central thickness of the first lens element110is CT1, and a central thickness of the fifth lens element150is CT5, the following condition is satisfied: CT1/CT5=3.85.

When the central thickness of the first lens element110is CT1, and a central thickness of the sixth lens element160is CT6, the following condition is satisfied: CT1/CT6=3.19.

When a sum of axial distances between each of all adjacent lens elements of the imaging lens assembly is ΣAT, and an axial distance between the fourth lens element140and the fifth lens element150is T45, the following condition is satisfied: ΣAT/T45=2.33. In this embodiment, an axial distance between two adjacent lens elements is an air gap in a paraxial region between the two adjacent lens elements; and ΣAT is the sum of the axial distances between the first lens element110and the second lens element120, the second lens element120and the third lens element130, the third lens element130and the fourth lens element140, the fourth lens element140and the fifth lens element150, and the fifth lens element150and the sixth lens element160.

When an axial distance between the object-side surface111of the first lens element110and the object-side surface131of the third lens element130is Dr1r5, and an axial distance between the image-side surface142of the fourth lens element140and the image-side surface162of the sixth lens element160is Dr8r12, the following condition is satisfied: Dr1r5/Dr8r12=1.37.

When an axial distance between the object-side surface111of the first lens element110and the image-side surface162of the sixth lens element160is Td, the following condition is satisfied: Td=7.36 [mm].

When the axial distance between the object-side surface111of the first lens element110and the image-side surface162of the sixth lens element160is Td, and an axial distance between the image-side surface162of the sixth lens element160and the image surface180is BL, the following condition is satisfied: Td/BL=1.19.

When an axial distance between the object-side surface111of the first lens element110and the image surface180is TL, and a maximum image height of the imaging lens assembly is ImgH, the following condition is satisfied: TL/ImgH=5.41.

When the axial distance between the object-side surface111of the first lens element110and the image surface180is TL, and the focal length of the imaging lens assembly is f, the following condition is satisfied: TL/f=0.93.

When the focal length of the imaging lens assembly is f, and a curvature radius of the object-side surface111of the first lens element110is R1, the following condition is satisfied: f/R1=4.25.

When a focal length of the first lens element110is f1, and a focal length of the second lens element120is f2, the following condition is satisfied: |f1/f2|=0.42.

When the focal length of the second lens element120is f2, and a focal length of the third lens element130is f3, the following condition is satisfied: |f3/f21=0.71.

When the focal length of the third lens element130is f3, and a focal length of the fifth lens element150is f5, the following condition is satisfied: |f5/f3|=0.54.

When the focal length of the imaging lens assembly is f, the focal length of the first lens element110is f1, the focal length of the second lens element120is f2, the focal length of the third lens element130is f3, a focal length of the fourth lens element140is f4, the focal length of the fifth lens element150is f5, and a focal length of the sixth lens element160is f6, the following condition is satisfied: |f/f1|+|f/f2|+|f/f3|+|f/f4|+|f/f5|+|f/f6|=10.79.

When a maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the image-side surface112of the first lens element110is Y12, the following condition is satisfied: Y11/Y12=1.17.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the object-side surface121of the second lens element120is Y21, the following condition is satisfied: Y11/Y21=1.20.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the image-side surface122of the second lens element120is Y22, the following condition is satisfied: Y11/Y22=1.31.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the object-side surface131of the third lens element130is Y31, the following condition is satisfied: Y11/Y31=1.34.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the image-side surface132of the third lens element130is Y32, the following condition is satisfied: Y11/Y32=1.44.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the object-side surface141of the fourth lens element140is Y41, the following condition is satisfied: Y11/Y41=1.43.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the image-side surface142of the fourth lens element140is Y42, the following condition is satisfied: Y11/Y42=1.64.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the object-side surface151of the fifth lens element150is Y51, the following condition is satisfied: Y11/Y51=1.83.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the image-side surface152of the fifth lens element150is Y52, the following condition is satisfied: Y11/Y52=1.73.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the object-side surface161of the sixth lens element160is Y61, the following condition is satisfied: Y11/Y61=1.67.

When the maximum effective radius of the object-side surface111of the first lens element110is Y11, and a maximum effective radius of the image-side surface162of the sixth lens element160is Y62, the following condition is satisfied: Y11/Y62=1.62.

FIG. 3is a schematic view of an image capturing unit according to the 2nd embodiment of the present disclosure.FIG. 4shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 2nd embodiment. InFIG. 3, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor290. The imaging lens assembly includes, in order from an object side to an image side, a stop201, a first lens element210, a second lens element220, a third lens element230, an aperture stop200, a fourth lens element240, a fifth lens element250, a stop202, a sixth lens element260, a glass element270and an image surface280. The imaging lens assembly includes six lens elements (210,220,230,240,250and260) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element210with positive refractive power has an object-side surface211being convex in a paraxial region thereof and an image-side surface212being convex in a paraxial region thereof. The first lens element210is made of plastic material and has the object-side surface211and the image-side surface212being both aspheric.

The second lens element220with negative refractive power has an object-side surface221being concave in a paraxial region thereof and an image-side surface222being concave in a paraxial region thereof. The second lens element220is made of plastic material and has the object-side surface221and the image-side surface222being both aspheric.

The third lens element230with negative refractive power has an object-side surface231being convex in a paraxial region thereof and an image-side surface232being concave in a paraxial region thereof. The third lens element230is made of glass material and has the object-side surface231and the image-side surface232being both aspheric.

The fourth lens element240with positive refractive power has an object-side surface241being convex in a paraxial region thereof and an image-side surface242being convex in a paraxial region thereof. The fourth lens element240is made of glass material and has the object-side surface241and the image-side surface242being both aspheric.

The fifth lens element250with negative refractive power has an object-side surface251being concave in a paraxial region thereof and an image-side surface252being concave in a paraxial region thereof. The fifth lens element250is made of plastic material and has the object-side surface251and the image-side surface252being both aspheric. The image-side surface252of the fifth lens element250has at least one convex critical point in an off-axis region thereof.

The sixth lens element260with positive refractive power has an object-side surface261being convex in a paraxial region thereof and an image-side surface262being concave in a paraxial region thereof. The sixth lens element260is made of plastic material and has the object-side surface261and the image-side surface262being both aspheric.

The glass element270is made of glass material and located between the sixth lens element260and the image surface280, and will not affect the focal length of the imaging lens assembly. The image sensor290is disposed on or near the image surface280of the imaging lens assembly.

FIG. 5is a schematic view of an image capturing unit according to the 3rd embodiment of the present disclosure.FIG. 6shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 3rd embodiment. InFIG. 5, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor390. The imaging lens assembly includes, in order from an object side to an image side, a stop301, a first lens element310, a second lens element320, a third lens element330, an aperture stop300, a fourth lens element340, a fifth lens element350, a stop302, a sixth lens element360, a glass element370and an image surface380. The imaging lens assembly includes six lens elements (310,320,330,340,350and360) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element310with positive refractive power has an object-side surface311being convex in a paraxial region thereof and an image-side surface312being concave in a paraxial region thereof. The first lens element310is made of glass material and has the object-side surface311and the image-side surface312being both aspheric.

The second lens element320with negative refractive power has an object-side surface321being convex in a paraxial region thereof and an image-side surface322being concave in a paraxial region thereof. The second lens element320is made of plastic material and has the object-side surface321and the image-side surface322being both aspheric.

The third lens element330with negative refractive power has an object-side surface331being convex in a paraxial region thereof and an image-side surface332being concave in a paraxial region thereof. The third lens element330is made of glass material and has the object-side surface331and the image-side surface332being both aspheric.

The fourth lens element340with positive refractive power has an object-side surface341being concave in a paraxial region thereof and an image-side surface342being convex in a paraxial region thereof. The fourth lens element340is made of plastic material and has the object-side surface341and the image-side surface342being both aspheric.

The fifth lens element350with negative refractive power has an object-side surface351being convex in a paraxial region thereof and an image-side surface352being concave in a paraxial region thereof. The fifth lens element350is made of plastic material and has the object-side surface351and the image-side surface352being both aspheric.

The sixth lens element360with positive refractive power has an object-side surface361being convex in a paraxial region thereof and an image-side surface362being concave in a paraxial region thereof. The sixth lens element360is made of plastic material and has the object-side surface361and the image-side surface362being both aspheric. The image-side surface362of the sixth lens element360has at least one concave shape in an off-axis region thereof.

The glass element370is made of glass material and located between the sixth lens element360and the image surface380, and will not affect the focal length of the imaging lens assembly. The image sensor390is disposed on or near the image surface380of the imaging lens assembly.

FIG. 7is a schematic view of an image capturing unit according to the 4th embodiment of the present disclosure.FIG. 8shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 4th embodiment. InFIG. 7, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor490. The imaging lens assembly includes, in order from an object side to an image side, a stop401, a first lens element410, a second lens element420, an aperture stop400, a third lens element430, a fourth lens element440, a fifth lens element450, a stop402, a sixth lens element460, an IR-cut filter470and an image surface480. The imaging lens assembly includes six lens elements (410,420,430,440,450and460) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element410with positive refractive power has an object-side surface411being convex in a paraxial region thereof and an image-side surface412being concave in a paraxial region thereof. The first lens element410is made of plastic material and has the object-side surface411and the image-side surface412being both aspheric.

The second lens element420with negative refractive power has an object-side surface421being convex in a paraxial region thereof and an image-side surface422being concave in a paraxial region thereof. The second lens element420is made of plastic material and has the object-side surface421and the image-side surface422being both aspheric.

The third lens element430with negative refractive power has an object-side surface431being convex in a paraxial region thereof and an image-side surface432being concave in a paraxial region thereof. The third lens element430is made of plastic material and has the object-side surface431and the image-side surface432being both aspheric.

The fourth lens element440with positive refractive power has an object-side surface441being convex in a paraxial region thereof and an image-side surface442being convex in a paraxial region thereof. The fourth lens element440is made of glass material and has the object-side surface441and the image-side surface442being both spherical.

The fifth lens element450with negative refractive power has an object-side surface451being concave in a paraxial region thereof and an image-side surface452being concave in a paraxial region thereof. The fifth lens element450is made of plastic material and has the object-side surface451and the image-side surface452being both aspheric. The image-side surface452of the fifth lens element450has at least one convex critical point in an off-axis region thereof.

The sixth lens element460with positive refractive power has an object-side surface461being convex in a paraxial region thereof and an image-side surface462being concave in a paraxial region thereof. The sixth lens element460is made of plastic material and has the object-side surface461and the image-side surface462being both aspheric. The image-side surface462of the sixth lens element460has at least one concave shape in an off-axis region thereof.

The IR-cut filter470is made of glass material and located between the sixth lens element460and the image surface480, and will not affect the focal length of the imaging lens assembly. The image sensor490is disposed on or near the image surface480of the imaging lens assembly.

FIG. 9is a schematic view of an image capturing unit according to the 5th embodiment of the present disclosure.FIG. 10shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 5th embodiment. InFIG. 9, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor590. The imaging lens assembly includes, in order from an object side to an image side, a first lens element510, a second lens element520, a third lens element530, an aperture stop500, a fourth lens element540, a fifth lens element550, a stop501, a sixth lens element560, an IR-cut filter570and an image surface580. The imaging lens assembly includes six lens elements (510,520,530,540,550and560) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element510with positive refractive power has an object-side surface511being convex in a paraxial region thereof and an image-side surface512being concave in a paraxial region thereof. The first lens element510is made of plastic material and has the object-side surface511and the image-side surface512being both aspheric.

The second lens element520with negative refractive power has an object-side surface521being concave in a paraxial region thereof and an image-side surface522being concave in a paraxial region thereof. The second lens element520is made of plastic material and has the object-side surface521and the image-side surface522being both aspheric.

The third lens element530with negative refractive power has an object-side surface531being convex in a paraxial region thereof and an image-side surface532being concave in a paraxial region thereof. The third lens element530is made of plastic material and has the object-side surface531and the image-side surface532being both aspheric.

The fourth lens element540with positive refractive power has an object-side surface541being convex in a paraxial region thereof and an image-side surface542being convex in a paraxial region thereof. The fourth lens element540is made of glass material and has the object-side surface541and the image-side surface542being both aspheric.

The fifth lens element550with negative refractive power has an object-side surface551being concave in a paraxial region thereof and an image-side surface552being concave in a paraxial region thereof. The fifth lens element550is made of plastic material and has the object-side surface551and the image-side surface552being both aspheric. The image-side surface552of the fifth lens element550has at least one convex critical point in an off-axis region thereof.

The sixth lens element560with positive refractive power has an object-side surface561being convex in a paraxial region thereof and an image-side surface562being concave in a paraxial region thereof. The sixth lens element560is made of plastic material and has the object-side surface561and the image-side surface562being both aspheric. The image-side surface562of the sixth lens element560has at least one concave shape in an off-axis region thereof.

The IR-cut filter570is made of glass material and located between the sixth lens element560and the image surface580, and will not affect the focal length of the imaging lens assembly. The image sensor590is disposed on or near the image surface580of the imaging lens assembly.

FIG. 11is a schematic view of an image capturing unit according to the 6th embodiment of the present disclosure.FIG. 12shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 6th embodiment. InFIG. 11, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor690. The imaging lens assembly includes, in order from an object side to an image side, a stop601, a first lens element610, a second lens element620, a third lens element630, an aperture stop600, a fourth lens element640, a fifth lens element650, a stop602, a sixth lens element660, an IR-cut filter670and an image surface680. The imaging lens assembly includes six lens elements (610,620,630,640,650and660) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element610with positive refractive power has an object-side surface611being convex in a paraxial region thereof and an image-side surface612being concave in a paraxial region thereof. The first lens element610is made of plastic material and has the object-side surface611and the image-side surface612being both aspheric.

The second lens element620with negative refractive power has an object-side surface621being convex in a paraxial region thereof and an image-side surface622being concave in a paraxial region thereof. The second lens element620is made of plastic material and has the object-side surface621and the image-side surface622being both aspheric.

The third lens element630with negative refractive power has an object-side surface631being concave in a paraxial region thereof and an image-side surface632being concave in a paraxial region thereof. The third lens element630is made of plastic material and has the object-side surface631and the image-side surface632being both aspheric.

The fourth lens element640with positive refractive power has an object-side surface641being convex in a paraxial region thereof and an image-side surface642being convex in a paraxial region thereof. The fourth lens element640is made of glass material and has the object-side surface641and the image-side surface642being both aspheric.

The fifth lens element650with negative refractive power has an object-side surface651being concave in a paraxial region thereof and an image-side surface652being concave in a paraxial region thereof. The fifth lens element650is made of plastic material and has the object-side surface651and the image-side surface652being both aspheric.

The sixth lens element660with positive refractive power has an object-side surface661being convex in a paraxial region thereof and an image-side surface662being concave in a paraxial region thereof. The sixth lens element660is made of plastic material and has the object-side surface661and the image-side surface662being both aspheric. The image-side surface662of the sixth lens element660has at least one concave shape in an off-axis region thereof.

The IR-cut filter670is made of glass material and located between the sixth lens element660and the image surface680, and will not affect the focal length of the imaging lens assembly. The image sensor690is disposed on or near the image surface680of the imaging lens assembly.

FIG. 13is a schematic view of an image capturing unit according to the 7th embodiment of the present disclosure.FIG. 14shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 7th embodiment. InFIG. 13, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor790. The imaging lens assembly includes, in order from an object side to an image side, a stop701, a first lens element710, a second lens element720, a third lens element730, an aperture stop700, a fourth lens element740, a fifth lens element750, a stop702, a sixth lens element760, an IR-cut filter770and an image surface780. The imaging lens assembly includes six lens elements (710,720,730,740,750and760) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element710with positive refractive power has an object-side surface711being convex in a paraxial region thereof and an image-side surface712being convex in a paraxial region thereof. The first lens element710is made of plastic material and has the object-side surface711and the image-side surface712being both aspheric.

The second lens element720with negative refractive power has an object-side surface721being concave in a paraxial region thereof and an image-side surface722being concave in a paraxial region thereof. The second lens element720is made of plastic material and has the object-side surface721and the image-side surface722being both aspheric.

The third lens element730with negative refractive power has an object-side surface731being concave in a paraxial region thereof and an image-side surface732being concave in a paraxial region thereof. The third lens element730is made of plastic material and has the object-side surface731and the image-side surface732being both aspheric.

The fourth lens element740with positive refractive power has an object-side surface741being convex in a paraxial region thereof and an image-side surface742being concave in a paraxial region thereof. The fourth lens element740is made of plastic material and has the object-side surface741and the image-side surface742being both aspheric.

The fifth lens element750with negative refractive power has an object-side surface751being concave in a paraxial region thereof and an image-side surface752being concave in a paraxial region thereof. The fifth lens element750is made of plastic material and has the object-side surface751and the image-side surface752being both aspheric. The image-side surface752of the fifth lens element750has at least one convex critical point in an off-axis region thereof.

The sixth lens element760with positive refractive power has an object-side surface761being convex in a paraxial region thereof and an image-side surface762being concave in a paraxial region thereof. The sixth lens element760is made of plastic material and has the object-side surface761and the image-side surface762being both aspheric. The image-side surface762of the sixth lens element760has at least one concave shape in an off-axis region thereof.

The IR-cut filter770is made of glass material and located between the sixth lens element760and the image surface780, and will not affect the focal length of the imaging lens assembly. The image sensor790is disposed on or near the image surface780of the imaging lens assembly.

FIG. 15is a schematic view of an image capturing unit according to the 8th embodiment of the present disclosure.FIG. 16shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 8th embodiment. InFIG. 15, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor890. The imaging lens assembly includes, in order from an object side to an image side, a stop801, a first lens element810, a second lens element820, a third lens element830, an aperture stop800, a fourth lens element840, a fifth lens element850, a sixth lens element860, an IR-cut filter870and an image surface880. The imaging lens assembly includes six lens elements (810,820,830,840,850and860) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element810with positive refractive power has an object-side surface811being convex in a paraxial region thereof and an image-side surface812being convex in a paraxial region thereof. The first lens element810is made of plastic material and has the object-side surface811and the image-side surface812being both aspheric.

The second lens element820with negative refractive power has an object-side surface821being concave in a paraxial region thereof and an image-side surface822being convex in a paraxial region thereof. The second lens element820is made of plastic material and has the object-side surface821and the image-side surface822being both aspheric.

The third lens element830with negative refractive power has an object-side surface831being convex in a paraxial region thereof and an image-side surface832being concave in a paraxial region thereof. The third lens element830is made of plastic material and has the object-side surface831and the image-side surface832being both aspheric.

The fourth lens element840with negative refractive power has an object-side surface841being convex in a paraxial region thereof and an image-side surface842being concave in a paraxial region thereof. The fourth lens element840is made of plastic material and has the object-side surface841and the image-side surface842being both aspheric.

The fifth lens element850with negative refractive power has an object-side surface851being concave in a paraxial region thereof and an image-side surface852being concave in a paraxial region thereof. The fifth lens element850is made of plastic material and has the object-side surface851and the image-side surface852being both aspheric.

The sixth lens element860with positive refractive power has an object-side surface861being convex in a paraxial region thereof and an image-side surface862being concave in a paraxial region thereof. The sixth lens element860is made of plastic material and has the object-side surface861and the image-side surface862being both aspheric. The image-side surface862of the sixth lens element860has at least one concave shape in an off-axis region thereof.

The IR-cut filter870is made of glass material and located between the sixth lens element860and the image surface880, and will not affect the focal length of the imaging lens assembly. The image sensor890is disposed on or near the image surface880of the imaging lens assembly.

Moreover, these parameters can be calculated from Table 15 and Table 16 as the following values and satisfy the following conditions:

FIG. 17is a schematic view of an image capturing unit according to the 9th embodiment of the present disclosure.FIG. 18shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 9th embodiment. InFIG. 17, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor990. The imaging lens assembly includes, in order from an object side to an image side, a first lens element910, an aperture stop900, a second lens element920, a third lens element930, a fourth lens element940, a fifth lens element950, a stop901, a sixth lens element960, an IR-cut filter970and an image surface980. The imaging lens assembly includes six lens elements (910,920,930,940,950and960) with no additional lens element disposed between each of the adjacent six lens elements.

The first lens element910with positive refractive power has an object-side surface911being convex in a paraxial region thereof and an image-side surface912being concave in a paraxial region thereof. The first lens element910is made of plastic material and has the object-side surface911and the image-side surface912being both aspheric.

The second lens element920with negative refractive power has an object-side surface921being convex in a paraxial region thereof and an image-side surface922being concave in a paraxial region thereof. The second lens element920is made of plastic material and has the object-side surface921and the image-side surface922being both aspheric.

The third lens element930with negative refractive power has an object-side surface931being convex in a paraxial region thereof and an image-side surface932being concave in a paraxial region thereof. The third lens element930is made of plastic material and has the object-side surface931and the image-side surface932being both aspheric.

The fourth lens element940with positive refractive power has an object-side surface941being convex in a paraxial region thereof and an image-side surface942being convex in a paraxial region thereof. The fourth lens element940is made of glass material and has the object-side surface941and the image-side surface942being both aspheric.

The fifth lens element950with negative refractive power has an object-side surface951being concave in a paraxial region thereof and an image-side surface952being convex in a paraxial region thereof. The fifth lens element950is made of plastic material and has the object-side surface951and the image-side surface952being both aspheric. The image-side surface952of the fifth lens element950has at least one convex critical point in an off-axis region thereof.

The sixth lens element960with positive refractive power has an object-side surface961being convex in a paraxial region thereof and an image-side surface962being concave in a paraxial region thereof. The sixth lens element960is made of plastic material and has the object-side surface961and the image-side surface962being both aspheric.

The IR-cut filter970is made of glass material and located between the sixth lens element960and the image surface980, and will not affect the focal length of the imaging lens assembly. The image sensor990is disposed on or near the image surface980of the imaging lens assembly.

The detailed optical data of the 9th embodiment are shown in Table 17 and the aspheric surface data are shown in Table 18 below.

Moreover, these parameters can be calculated from Table 17 and Table 18 as the following values and satisfy the following conditions:

FIG. 19is a schematic view of a second lens element of an image capturing unit according to the 10th embodiment of the present disclosure. In this embodiment, an image capturing unit10includes the imaging lens assembly (not numbered) of the present disclosure, a lens barrel (not shown) and an image sensor (not shown). The imaging lens assembly is disposed in the lens barrel, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The imaging lens assembly includes a light blocking sheet (not shown) and a plurality of lens elements (not numbered). The lens elements include a second lens element1020which can be, for example, the second lens element120disclosed in the 1st embodiment, but the present disclosure is not limited thereto. The second lens element1020has two trimmed edges1021and1022at an outer diameter position thereof. In this embodiment, the outer diameter position means the outer perimeter of the optically effective area of the second lens element1020.

FIG. 20shows a schematic view of LRmin and LRmax of the second lens element inFIG. 19. When twice of a minimum distance from a center to the outer diameter position of the second lens element1020is LRmin, and twice of a maximum distance from the center to the outer diameter position of the second lens element1020is LRmax, the following conditions are satisfied: LRmin=4.50 [mm]; LRmax=5.40 [mm]; and LRmin/LRmax=0.83.

FIG. 21is a schematic view of a first lens element of an image capturing unit according to the 11th embodiment of the present disclosure. In this embodiment, an image capturing unit11includes the imaging lens assembly (not numbered) of the present disclosure, a lens barrel (not shown) and an image sensor (not shown). The imaging lens assembly is disposed in the lens barrel, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The imaging lens assembly includes a light blocking sheet (not shown) and a plurality of lens elements (not numbered). The lens elements include a first lens element1110which can be, for example, the first lens element110disclosed in the 1st embodiment, but the present disclosure is not limited thereto. The first lens element1110has four trimmed edges1111,1112,1113and1114at an outer diameter position thereof.

FIG. 22shows a schematic view of LRmin and LRmax of the first lens element inFIG. 21. When twice of a minimum distance from a center to the outer diameter position of the first lens element1110is LRmin, and twice of a maximum distance from the center to the outer diameter position of the first lens element1110is LRmax, the following conditions are satisfied: LRmin=4.70 [mm]; LRmax=5.40 [mm]; and LRmin/LRmax=0.87.

FIG. 23is a schematic view of a light blocking sheet of an image capturing unit according to the 12th embodiment of the present disclosure. In this embodiment, an image capturing unit12includes the imaging lens assembly (not numbered) of the present disclosure, a lens barrel (not shown) and an image sensor (not shown). The imaging lens assembly is disposed in the lens barrel, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The imaging lens assembly includes a light blocking sheet1200and a plurality of lens elements (not shown). The light blocking sheet1200can be, for example, the aperture stop disclosed in any one of the aforementioned embodiments, but the present disclosure is not limited thereto. The light blocking sheet1200has an opening (not numbered) at a central position and has two trimmed edges1201and1202at an outer diameter position thereof.

FIG. 24is a schematic view of a lens barrel of an image capturing unit according to the 13th embodiment of the present disclosure.FIG. 25is a cross-sectional view of the lens barrel inFIG. 24. In this embodiment, an image capturing unit13includes the imaging lens assembly (not numbered) of the present disclosure, a lens barrel1391and an image sensor (not shown). The imaging lens assembly can be, for example, the imaging lens assembly disclosed the 6th embodiment, but the present disclosure is not limited thereto. The imaging lens assembly is disposed in the lens barrel1391, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The lens barrel1391includes a retainer1396. The lens barrel1391has an opening (not numbered) at a central position and has at least two trimmed edges at an outer diameter position thereof. Therefore, it is favorable for reducing one axial dimension of any single lens element so as to further miniaturize the imaging lens assembly. Specifically, the lens barrel1391has two trimmed edges1392and1393.

FIG. 26is a schematic view of a lens barrel of an image capturing unit according to the 14th embodiment of the present disclosure. In this embodiment, an image capturing unit14includes the imaging lens assembly (not shown) of the present disclosure, a lens barrel1491and an image sensor (not shown). The imaging lens assembly is disposed in the lens barrel1491, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The lens barrel1491has an opening (not numbered) at a central position and has two trimmed edges1492and1493at an outer diameter position thereof.

FIG. 27is a schematic view of a lens barrel of an image capturing unit according to the 15th embodiment of the present disclosure. In this embodiment, an image capturing unit15includes the imaging lens assembly (not shown) of the present disclosure, a lens barrel1591and an image sensor (not shown). The imaging lens assembly is disposed in the lens barrel1591, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The lens barrel1591includes a retainer1596. The lens barrel1591has an opening (not numbered) at a central position and has two trimmed edges1592and1593at an outer diameter position thereof. The retainer1596has two trimmed edges1597and1598at an outer diameter position thereof, and the trimmed edges1597and1598are respectively corresponding to the trimmed edges1592and1593.

FIG. 28is a schematic view of a lens barrel of an image capturing unit according to the 16th embodiment of the present disclosure. In this embodiment, an image capturing unit16includes the imaging lens assembly (not shown) of the present disclosure, a lens barrel1691and an image sensor (not shown). The imaging lens assembly is disposed in the lens barrel1691, and the image sensor is disposed on or near an image surface (not shown) of the imaging lens assembly. The lens barrel1691has an opening (not numbered) at a central position, two trimmed edges1692and1693at an outer diameter position thereof and two trimmed edges1694and1695at an inner diameter position thereof, and the trimmed edges1692and1693are respectively corresponding to the trimmed edges1694and1695. In this embodiment, the inner diameter position means the inner perimeter of the optically effective area of the lens barrel1691.

FIG. 29is a perspective view of an image capturing unit according to the 17th embodiment of the present disclosure. In this embodiment, an image capturing unit20is a camera module including a lens unit21, a driving device22, an image sensor23and an image stabilizer24. The lens unit21includes the imaging lens assembly disclosed in the 6th embodiment, a lens barrel and a holder member (their reference numerals are omitted) for holding the imaging lens assembly. The imaging light converges in the lens unit21of the image capturing unit20to generate an image with the driving device22utilized for image focusing on the image sensor23, and the generated image is then digitally transmitted to other electronic component for further processing.

The driving device22can have auto focusing functionality, and different driving configurations can be obtained through the usages of voice coil motors (VCM), micro electro-mechanical systems (MEMS), piezoelectric systems, or shape memory alloy materials. The driving device22is favorable for obtaining a better imaging position of the lens unit21, so that a clear image of the imaged object can be captured by the lens unit21with different object distances. The image sensor23(for example, CCD or CMOS), which can feature high photosensitivity and low noise, is disposed on the image surface of the imaging lens assembly to provide higher image quality.

The image stabilizer24, such as an accelerometer, a gyro sensor and a Hall Effect sensor, is configured to work with the driving device22to provide optical image stabilization (01S). The driving device22working with the image stabilizer24is favorable for compensating for pan and tilt of the lens unit21to reduce blurring associated with motion during exposure. In some cases, the compensation can be provided by electronic image stabilization (EIS) with image processing software, thereby improving image quality while in motion or low-light conditions.

FIG. 30is one perspective view of an electronic device according to the 18th embodiment of the present disclosure.FIG. 31is another perspective view of the electronic device inFIG. 30.FIG. 32shows a schematic view of a configuration of a reflector and the imaging lens assembly of the electronic device inFIG. 30.FIG. 33shows a schematic view of an enlarged configuration of the reflector and the imaging lens assembly inFIG. 32.FIG. 34is a block diagram of the electronic device inFIG. 30.

In this embodiment, an electronic device30is a smartphone including the image capturing unit20disclosed in the 17th embodiment, an image capturing unit20a, an image capturing unit20b, a flash module31, a focus assist module32, an image signal processor33, a user interface34and an image software processor35. The image capturing unit20, the image capturing unit20aand the image capturing unit20ball face the same direction, and each of the image capturing units20,20aand20bhas a single focal point. Furthermore, the image capturing unit20aand the image capturing unit20bboth have a configuration similar to that of the image capturing unit20. In detail, each of the image capturing unit20aand the image capturing unit20bincludes a lens unit, a driving device, an image sensor and an image stabilizer, and the lens unit includes a lens assembly, a lens barrel and a holder member for holding the lens assembly.

In this embodiment, the image capturing units20,20aand20bhave different fields of view. In detail, the image capturing unit20is a telephoto image capturing unit, the image capturing unit20ais a wide-angle image capturing unit, and the image capturing unit20bis a macro image capturing unit. Each two of the image capturing units20,20aand20bcan have maximum fields of view different by at least 15 degrees, and a maximum field of view of the image capturing unit20and a maximum field of view of the image capturing unit20acan differ by at least 50 degrees. Moreover, the maximum field of view of the image capturing unit20and the maximum field of view of the image capturing unit20acan differ by at least 75 degrees. Specifically, the maximum field of view of the image capturing unit20is 19.6 degrees, the maximum field of view of the image capturing unit20ais 120.0 degrees, and a maximum field of view of the image capturing unit20bis 72.0 degrees. Moreover, the maximum field of view of the image capturing unit20and the maximum field of view of the image capturing unit20adiffer by 100.4 degrees, the maximum field of view of the image capturing unit20and the maximum field of view of the image capturing unit20bdiffer by 52.4 degrees, and the maximum field of view of the image capturing unit20aand the maximum field of view of the image capturing unit20bdiffer by 48.0 degrees. Accordingly, the electronic device30has various magnification ratios so as to meet the requirement of optical zoom functionality. In this embodiment, the electronic device30includes multiple image capturing units20,20aand20b, but the present disclosure is not limited to the number and arrangement of image capturing units.

In this embodiment, one of the image capturing units20,20aand20bwith the smallest value of the maximum fields of view can further include a reflector. Therefore, it is favorable for substantially changing the direction of the optical axis of the one of the image capturing units20,20aand20bby 90 degrees. The so-called “substantially changing the direction by 90 degrees” means that the change angle of the direction may be within 90±3 degrees in consideration of assembly tolerances of the components in the image capturing units. Specifically, the image capturing unit20includes a reflector REF, while the image capturing units20aand20bdo not include any reflector. Accordingly, the direction of the optical axis of the image capturing unit20is different from the directions of the optical axes of the image capturing units20aand20b.

The reflector REF is a reflective mirror disposed in the electronic device30and located on the object side of the first lens element610. In other words, the reflector REF is disposed in the electronic device30and is located between an imaged object (not shown) and the imaging lens assembly (not numbered) according to the 6th embodiment of the present disclosure, but the present disclosure is not limited to the type, number and arrangement of the reflector REF disclosed inFIG. 32andFIG. 33. In some embodiments, the reflector can be a prism. In other embodiments, the reflector can also be disposed between the glass element and the image surface or between the IR-cut filter and the image surface. As seen inFIG. 32andFIG. 33, the reflective REF is favorable for changing the direction of incident light rays such that the dimensions of the electronic device30are not dictated by the total track length.

When a user captures images of an object36, the light rays converge in the image capturing unit20, the image capturing unit20aor the image capturing unit20bto generate an image(s), and the flash module31is activated for light supplement. The focus assist module32detects the object distance of the imaged object36to achieve fast auto focusing. The image signal processor33is configured to optimize the captured image to improve image quality. The light beam emitted from the focus assist module32can be either conventional infrared or laser. The user interface34can be a touch screen or a physical button. The user is able to interact with the user interface34and the image software processor35having multiple functions to capture images and perform image processing. The image processed by the image software processor35can be displayed on the user interface34.

FIG. 35is a perspective view of an electronic device according to the 19th embodiment of the present disclosure.

In this embodiment, an electronic device40is a smartphone including an image capturing unit45, an image capturing unit45a, an image capturing unit45b, a flash module41, a focus assist module42, an image signal processor43, a user interface (not shown) and an image software processor (not shown). In this embodiment, the image capturing unit45, the image capturing unit45aand the image capturing unit45bare all camera modules and face the same direction, and each of the image capturing units45,45aand45bhas a single focal point. Each of the image capturing unit45, the image capturing unit45aand the image capturing unit45bincludes a lens unit, a driving device, an image sensor and an image stabilizer. The lens unit of the image capturing unit45,45aand45beach include a lens assembly, a lens barrel and a holder member for holding the lens assembly.

In this embodiment, the image capturing units45,45aand45bhave different fields of view. Specifically, the image capturing unit45is a telephoto image capturing unit and have a maximum field of view being 24.8 degrees, the image capturing unit45ais a wide-angle image capturing unit and have a maximum field of view being 90.0 degrees, and the image capturing unit45bis a macro image capturing unit and have a maximum field of view being 65.0 degrees. Moreover, the maximum field of view of the image capturing unit45and the maximum field of view of the image capturing unit45adiffer by 65.2 degrees, the maximum field of view of the image capturing unit45and the maximum field of view of the image capturing unit45bdiffer by 40.2 degrees, and the maximum field of view of the image capturing unit45aand the maximum field of view of the image capturing unit45bdiffer by 25.0 degrees. Accordingly, the electronic device40has various magnification ratios so as to meet the requirement of optical zoom functionality. In this embodiment, the electronic device40includes multiple image capturing units45,45aand45b, but the present disclosure is not limited to the number and arrangement of image capturing units.

The smartphone in this embodiment is only exemplary for showing the image capturing units20and45installed in an electronic device, and the present disclosure is not limited thereto. The image capturing units20and45can be optionally applied to systems with a movable focus. Furthermore, the image capturing units20and45features good capability in aberration corrections and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, dashboard cameras, vehicle backup cameras, multi-camera devices, image recognition systems, motion sensing input devices, wearable devices and other electronic imaging devices.