Imaging lens assembly, image capturing unit and electronic device

An imaging lens assembly includes 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 second lens element has positive refractive power. The third lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 106132637, filed on Sep. 22, 2017, 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

In recent years, with the popularity of electronic devices having camera functionalities, the demand of miniaturized optical systems has been increasing. As advanced semiconductor manufacturing technologies have reduced the pixel size of sensors, and compact optical systems have gradually evolved toward the field of higher megapixels, there is an increasing demand for compact optical systems featuring better image quality.

For various applications, the optical systems have been widely applied to different kinds of electronic devices, such as vehicle devices, image recognition systems, entertainment devices, sport devices and intelligent home systems. In particular, portable electronic devices equipped with the optical systems are now more popular than ever. Furthermore, in order to provide better user experience, the electronic devices equipped with one or more optical systems have become the mainstream on the market, and the optical systems are developed with various optical characteristics according to different requirements.

However, lens elements in a conventional telephoto type camera are usually made of glass material and have spherical lens surfaces, such that it is difficult to reduce the camera size, and thereby an electronic device equipped with the camera would likely be large as well; therefore, it is unfavorable for the telephoto camera to be installed in a compact portable electronic device. On the other hand, a conventional compact telephoto camera is usually equipped with a small aperture due to its size limitation, thereby leading to low image brightness. Furthermore, many optical systems on the market are incapable of capturing detailed images of an object from afar; accordingly, the conventional optical systems are unable to satisfy the market demands. As a result, there is a need to develop an optical system featuring telephoto, compact size and high image quality.

SUMMARY

According to one aspect of the present disclosure, an imaging lens assembly includes 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 second lens element has positive refractive power. The third lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point. When a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, a curvature radius of the image-side surface of the fifth lens element is R10, a curvature radius of an image-side surface of the sixth lens element is R12, an axial distance between the third lens element and the fourth lens element is T34, and an axial distance between the fifth lens element and the sixth lens element is T56, the following conditions are satisfied:
2.15<f/ImgH<5.5;
R10/R12<1.8; and
0<T56/T34<0.85.

According to another aspect of the present disclosure, an imaging lens assembly includes 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 second lens element has positive refractive power. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point. When a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, a central thickness of the first lens element is CT1, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, a curvature radius of an object-side surface of the first lens element is R1, and a curvature radius of an image-side surface of the sixth lens element is R12, the following conditions are satisfied:
2.15<f/ImgH<5.5;
0.10<(CT1+T12)/(T23+T34+T45)<0.90; and
−1.70<(R1−R12)/(R1+R12)<5.0.

According to still another aspect of the present disclosure, an imaging lens assembly includes 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 positive refractive power. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point. When a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, a central thickness of the first lens element is CT1, an axial distance between the third lens element and the fourth lens element is T34, and an axial distance between the fourth lens element and the fifth lens element is T45, the following conditions are satisfied:
2.15<f/ImgH<5.5; and
1.8<(CT1+T34)/T45<33.0.

According to yet another aspect of the present disclosure, an imaging lens assembly includes 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 second lens element has positive refractive power. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point. When half of a maximum field of view of the imaging lens assembly is HFOV, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and an Abbe number of the sixth lens element is V6, the following conditions are satisfied:
5.0[deg.]<HFOV<23.0[deg.]; and
10<V3+V4+V6<95.

According to yet still another aspect of the present disclosure, an imaging lens assembly includes 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 second lens element has positive refractive power. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point. When half of a maximum field of view of the imaging lens assembly is HFOV, an axial distance between an object-side surface of the first lens element and an image surface is TL, a focal length of the imaging lens assembly is f, and a maximum image height of the imaging lens assembly is ImgH, the following conditions are satisfied:
5.0[deg.]<HFOV<23.0[deg.];
0.70<TL/f<1.10; and
2.0<f/ImgH<10.

According to yet still another aspect of the present disclosure, an image capturing unit includes the aforementioned imaging lens assembly, a driving device and an image sensor, wherein the driving device is disposed on the imaging lens assembly, and the image sensor is disposed on the image surface of the imaging lens assembly.

According to yet still another aspect of the present disclosure, an electronic device includes the aforementioned image capturing unit.

According to yet still another aspect of the present disclosure, an imaging lens assembly includes 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 an object-side surface being convex in a paraxial region thereof. The second lens element has positive refractive power. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element has at least one inflection point. When half of a maximum field of view of the imaging lens assembly is HFOV, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, a central thickness of the fourth lens element is CT4, and an axial distance between the third lens element and the fourth lens element is T34, the following conditions are satisfied:
5.0[deg.]<HFOV<30.0[deg.];
0.70<TL/f<1.45;
2.0<f/ImgH<10; and
0.05<CT4/T34<0.85.

DETAILED DESCRIPTION

An imaging lens assembly includes 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.

There can be an air gap in a paraxial region between every adjacent lens elements of the imaging lens assembly; that is, each of the first through the sixth lens elements can be a single and non-cemented lens element. The manufacturing process of cemented lenses is more complex than the non-cemented lenses, particularly when an image-side surface of one lens element and an object-side surface of the following lens element need to have accurate curvatures to ensure both lenses being highly cemented. However, during the cementing process, those two lens elements might not be highly cemented due to misalignment and it is thereby not favorable for the image quality. Therefore, having an air gap in a paraxial region between every adjacent lens elements of the imaging lens assembly in the present disclosure is favorable for preventing the problem associated with the cemented lens elements while improving the yield rate.

The first lens element can have positive refractive power; therefore, it is favorable for the distribution of light converging power among lens elements on the object side of the imaging lens assembly, so as to prevent overly strong refractive power from any one of the lens elements, thereby reducing aberrations. The first lens element can have an object-side surface being convex in a paraxial region thereof; therefore, it is favorable for balancing the lens curvatures so as to reduce spherical aberration. In addition, when configured with a concave image-side surface of the first lens element, it is favorable for light in both sagittal direction and tangential direction converging, thereby correcting astigmatism.

The second lens element has positive refractive power; therefore, it is favorable for providing the main light converging power so as to reduce the total track length of the imaging lens assembly, thereby achieving compactness.

The third lens element has negative refractive power; therefore, it is favorable for correcting chromatic aberration so as to prevent image overlaps due to light rays with different wavelengths focusing on different positions. The third lens element can have an image-side surface being concave in a paraxial region thereof; therefore, it is favorable for balancing light divergence capability so as to correct aberrations. In addition, when configured with an object-side surface being convex in a paraxial region of the third lens element, it is favorable for correcting aberrations of the second lens element, thereby improving the image quality.

The fifth lens element has negative refractive power; therefore, the refractive power distribution on the image side is favorable for avoiding the overly long back focal length of the imaging lens assembly and the difficulty of minimizing the size of the electronic devices with the imaging lens assembly. The fifth lens element has an image-side surface being concave in a paraxial region thereof; therefore, it is favorable for reducing the back focal length and miniaturization. The image-side surface of the fifth lens element has at least one inflection point; therefore, it is favorable for reducing distortion, preventing vignetting in the peripheral region of the image, and correcting off-axis aberrations. Please refer toFIG. 25, which shows a schematic view of an inflection point P on the image-side surface of the fifth lens element according to the 1st embodiment of the present disclosure.

The sixth lens element can have an image-side surface being concave in a paraxial region thereof, and the image-side surface of the sixth lens element can have a convex shape in an off-axis region thereof. Therefore, it is favorable for correcting off-axis aberrations and improving the Petzval field curvature so as to reduce the size of the imaging lens assembly and provide high image quality.

Each of an image-side surface of the fourth lens element, the image-side surface of the fifth lens element and the image-side surface of the sixth lens element can have a convex shape in an off-axis region thereof. Therefore, it is favorable for correcting distortion and field curvature so as to improve peripheral image quality.

According to the present disclosure, each of at least two of the six lens elements of the imaging lens assembly can have at least one inflection point. Therefore, it is favorable for correcting off-axis aberrations and reducing the total track length of the imaging lens assembly.

When a focal length of the imaging lens assembly is f, 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: 2.0<f/ImgH<10. Therefore, it is favorable for obtaining a telephoto configuration in the imaging lens assembly so as to capture detailed images of an object from afar, and become applicable to a wide range of applications. Preferably, the following condition can also be satisfied: 2.15<f/ImgH<5.5.

When a curvature radius of the image-side surface of the fifth lens element is R10, and a curvature radius of the image-side surface of the sixth lens element is R12, the following condition can be satisfied: R10/R12<1.8. Therefore, it is favorable for balancing the shapes of the image-side surfaces of the fifth and the sixth lens elements so as to enhance the capability of aberration corrections on the image side of the imaging lens assembly. Preferably, the following condition can also be satisfied: −1.8<R10/R12<1.3.

When an axial distance between the third lens element and the fourth lens element is T34, and an axial distance between the fifth lens element and the sixth lens element is T56, the following condition can be satisfied: 0<T56/T34<0.85. Therefore, it is favorable for arranging the axial distances between the lens elements in the middle part of the imaging lens assembly so as to provide sufficient distance for refracted light rays to travel, thereby obtaining the telephoto effect. Preferably, the following condition can also be satisfied: 0<T56/T34<0.55.

When a central thickness of the first lens element is CT1, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, and an axial distance between the fourth lens element and the fifth lens element is T45, the following condition can be satisfied: 0.10<(CT1+T12)/(T23+T34+T45)<0.90. Therefore, it is favorable for obtaining proper spacing in the imaging lens assembly with proper axial distances between the lens elements so as to correct aberrations. Preferably, the following condition can also be satisfied: 0.20<(CT1+T12)/(T23+T34+T45)<0.70.

When a curvature radius of the object-side surface of the first lens element is R1, and the curvature radius of the image-side surface of the sixth lens element is R12, the following condition can be satisfied: −1.70<(R1−R12)/(R1+R12)<5.0. Therefore, it is favorable for controlling the curvature configuration of the lens element closest to the object side and the lens element closest to the image side and correcting astigmatism and balancing the shape distribution of the lens elements so as to improve the image quality. Preferably, the following condition can be satisfied: −1.50<(R1−R12)/(R1+R12)<2.0. More preferably, the following condition can also be satisfied: −1.50<(R1−R12)/(R1+R12)<0.

When the central thickness of the first lens element is CT1, the axial distance between the third lens element and the fourth lens element is T34, and the axial distance between the fourth lens element and the fifth lens element is T45, the following condition can be satisfied: 1.8<(CT1+T34)/T45<33.0. Therefore, it is favorable for balancing between lens thickness and axial distances between lens elements so as to prevent molding problems due to overly large lens thickness, and interference in assembling due to overly small axial distances between lens elements. Preferably, the following condition can also be satisfied: 3.0<(CT1+T34)/T45<25.0.

When half of a maximum field of view of the imaging lens assembly is HFOV, the following condition can be satisfied: 5.0 [deg.]<HFOV<30.0 [deg.]. Therefore, it is favorable for controlling the imaging range of the imaging lens assembly so as to become applicable to a wide range of applications. Preferably, the following condition can also be satisfied: 5.0 [deg.]<HFOV<23.0 [deg.].

When an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and an Abbe number of the sixth lens element is V6, the following condition can be satisfied: 10<V3+V4+V6<95. Therefore, it is favorable for obtaining the proper materials for the lens elements so as to increase the density difference between each lens element and air, thereby strengthening the refractive power of the lens elements with light properly refracted within a shorter distance, and therefore it is favorable for reducing the total track length and becoming applicable to a wide range of applications. Preferably, the following condition can also be satisfied: 30<V3+V4+V6<80.

When an axial distance between the object-side surface of the first lens element and an image surface is TL, and the focal length of the imaging lens assembly is f, the following condition can be satisfied: 0.70<TL/f<1.45. Therefore, it is favorable for balancing between the total track length and the field of view so as to provide high image quality with high-end specifications. Preferably, the following condition can also be satisfied: 0.70<TL/f<1.10.

When a central thickness of the fourth lens element is CT4, and the axial distance between the third lens element and the fourth lens element is T34, the following condition can be satisfied: 0.05<CT4/T34<0.85. Therefore, it is favorable for balancing between the central thickness of the fourth lens element and the axial distance between the third lens element and the fourth lens element so as to improve lens assembling, thereby reducing the manufacturing sensitivity.

When a vertical distance between a non-axial critical point on the image-side surface of the fifth lens element and an optical axis is Yc52, and the focal length of the imaging lens assembly is f, the following condition can be satisfied: 0.01<Yc52/f<1.0. Therefore, it is favorable for controlling the incident angle of marginal rays projecting on the image surface, and correcting field curvature so as to provide high image quality. Please refer toFIG. 25, which shows a schematic view of Yc52 and a critical point C on the image-side surface of the fifth lens element according to the 1st embodiment of the present disclosure.

When the focal length of the imaging lens assembly is f, and a curvature radius of an object-side surface of the fifth lens element is R9, the following condition can be satisfied: −0.50<f/R9<5.0. Therefore, it is favorable for balancing the curvature of the object-side surface of the fifth lens element so as to control the refractive power of the fifth lens element for improving the image quality.

When the focal length of the imaging lens assembly is f, a curvature radius of an object-side surface of one lens element of the six lens elements is Rf, and a curvature radius of an image-side surface of the lens element of the six lens elements is Rr, at least one of the six lens elements satisfies the following condition: |f/Rf|+|f/Rr|<1.0. Therefore, it is favorable for controlling the refractive power of any one of the lens elements so as to prevent total reflection due to overly curved surfaces of the lens element, thereby reducing unwanted spots on the image. Preferably, the following condition can also be satisfied: |f/Rf|+|f/Rr|<0.50.

When a maximum value among all refractive indices of the six lens elements of the imaging lens assembly is Nmax, the following condition can be satisfied: 1.50<Nmax<1.75. Therefore, it is favorable for selecting proper materials of the six lens elements so as to balance between high image quality and a short total track length, thereby achieving miniaturization.

When the focal length of the imaging lens assembly is f, and an entrance pupil diameter of the imaging lens assembly is EPD, the following condition can be satisfied: 0.90<f/EPD<2.55. Therefore, it is favorable for providing sufficient amount of incident light so as to increase image resolution.

When the focal length of the imaging lens assembly is f, and the curvature radius of the object-side surface of the first lens element is R1, the following condition can be satisfied: 2.85<f/R1<6.0. Therefore, it is favorable for enhancing the light convergence capability of the first lens element so as to reduce the total track length.

According to the present disclosure, each of at least three of the six lens elements of the imaging lens assembly can have an Abbe number smaller than 25.0. Therefore, due to a larger density difference between a high-dispersion material (low Abbe number) and air, it is favorable for obtaining stronger refractive capability, such that light is properly refracted within a shorter distance for reducing the size of the imaging lens assembly. Preferably, each of at least two of the six lens elements of the imaging lens assembly can have an Abbe number smaller than 22.0. More preferably, at least one of the six lens elements of the imaging lens assembly can have an Abbe number smaller than 20.0. Much more preferably, each of at least two of the six lens elements of the imaging lens assembly can have an Abbe number smaller than 20.0.

According to the present disclosure, the axial distance between the third lens element and the fourth lens element is the largest among all axial distances between every adjacent lens elements of the imaging lens assembly; that is, the axial distance between the third lens element and the fourth lens element is larger than other axial distances between every adjacent lens elements of the imaging lens assembly. Therefore, balancing the axial distance between the third lens element and the fourth lens element is favorable for providing a sufficient distance for refracted light rays to travel so as to obtain high image quality.

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 can be satisfied: −1.90<f2/f3<−0.85. Therefore, it is favorable for balancing the refractive power distribution of the imaging lens assembly so as to reduce the sensitivity.

When a maximum effective radius of the object-side surface of the first lens element is Y11, and a maximum effective radius of the image-side surface of the sixth lens element is Y62, the following condition can be satisfied: 0.80<Y62/Y11<1.65. Therefore, it is favorable for the imaging lens assembly to have sufficient pupil diameters on the object side and the image side so as to increase image brightness. Please refer toFIG. 25, which shows a schematic view of Y11 and Y62 according to the 1st embodiment of the present disclosure.

According to the present disclosure, the imaging lens assembly further includes an aperture stop, and the aperture stop can be located between an imaged object and the third lens element. When an axial distance between the aperture stop and the image-side surface of the sixth lens element is SD, and an 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: 0.75<SD/TD<0.90. Therefore, it is favorable for balancing between the field of view and the total track length of the image capturing lens system, while keeping electronic devices compact with improved practicality.

When the axial distance between the third lens element and the fourth lens element is T34, and the axial distance between the fourth lens element and the fifth lens element is T45, the following condition can be satisfied: 0<T45/T34<5.5. Therefore, it is favorable for arranging the axial distances between the lens elements so as to reduce the sensitivity of the imaging lens assembly. Preferably, the following condition can be satisfied: 0<T45/T34<1.5. More preferably, the following condition can also be satisfied: 0<T45/T34<0.6.

When the axial distance between the fourth lens element and the fifth lens element is T45, a central thickness of the fourth lens element is CT4, and a central thickness of the fifth lens element is CT5, the following condition can be satisfied: 0<T45/(CT4+CT5)<2.4. Therefore, it is favorable for obtaining proper lens thicknesses for lens molding and proper axial distance between the fourth lens element and the fifth lens element for applications in compact electronic devices.

When a maximum value among all axial distances between each of the six adjacent lens elements is ATmax, and a maximum value among all central thicknesses of the six lens elements is CTmax, the following condition can be satisfied: 1.20<ATmax/CTmax<6.0. Therefore, it is favorable for balancing space arrangement of lens elements with more efficient space utilization.

When the focal length of the imaging lens assembly is f, and the curvature radius of the image-side surface of the sixth lens element is R12, the following condition can be satisfied: −0.65<f/R12<4.0. Therefore, it is favorable for controlling the back focal length so as to prevent overly long track length, thereby minimizing the size of the imaging lens assembly.

When the focal length of the second lens element is f2, and a focal length of the fifth lens element is f5, the following condition can be satisfied: −3.0<f2/f5<−0.8. Therefore, it is favorable for balancing the refractive power distribution on the object side and the image side of the imaging lens assembly so as to reduce the total track length for various applications.

When the Abbe number of the third lens element is V3, the following condition can be satisfied: 10.0<V3<35.0. Therefore, it is favorable for increasing the density difference between the third lens element and air so as to enhance the capability of aberration corrections of the third lens element.

When the Abbe number of the fourth lens element is V4, the following condition can be satisfied: 10.0<V4<35.0. Therefore, it is favorable for increasing the density difference between the fourth lens element and air so as to enhance the capability of aberration corrections of the fourth lens element.

According to the present disclosure, the imaging lens assembly can include at least one reflector. The reflector is, for example, a prism or a reflective mirror. Therefore, the traveling direction of light rays can be changed, such that it is favorable for obtaining good space utilization and also more design flexibility in the imaging lens assembly. As seen inFIG. 26, which shows a schematic view of a reflector and the imaging lens assembly according to one embodiment of the present disclosure, wherein the reflector is a prism P1 disposed between the imaged object (not shown in the drawings) and the lens elements of the imaging lens assembly (its reference numerals is omitted), but the disclosure is not limited to the type, the amount and the position of the reflector shown inFIG. 26. For example, as shown inFIG. 27, which shows a schematic view of another reflector and the imaging lens assembly according to one embodiment of the present disclosure, the reflector is a reflective mirror P2. Please refer toFIG. 28andFIG. 29.FIG. 28shows a schematic view of two reflectors and the imaging lens assembly according to one embodiment of the present disclosure, andFIG. 29shows a schematic view of two reflectors and the imaging lens assembly according to another embodiment of the present disclosure, wherein the two prisms P1 are respectively located on the object side and the image side of the lens elements of the imaging lens assembly. As shown inFIG. 30, the traveling direction of incident light rays can be changed by the reflector (the prism P1), such that the dimensions of the electronic device is not restricted by the total track length of the imaging lens assembly.

According to the present disclosure, each of 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 thereof can be made of glass or plastic material. When the lens elements are made of glass material, the distribution of the refractive power of the imaging lens assembly may be more flexible to design. When the lens elements are made of plastic material, the manufacturing cost can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be aspheric, since the aspheric surface of the lens element is easy to form a shape other than spherical surface so as to have more controllable variables for eliminating the aberration thereof, and to further decrease the required number of the lens elements. Therefore, the total track length of the imaging lens assembly can also be reduced.

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, 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, an inflection point is a point on the surface of the lens element at which the surface changes from concave to convex, or vice versa. 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, an 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 correcting 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 an 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 the 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.

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, an aperture stop100, a first lens element110, a second lens element120, a third lens element130, a fourth lens element140, a fifth lens element150, a sixth lens element160, a filter170and an image surface180. The imaging lens assembly includes six single and non-cemented lens elements (110,120,130,140,150and160) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 concave 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 positive refractive power has an object-side surface121being convex in a paraxial region thereof and an image-side surface122being convex 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 object-side surface121of the second lens element120has at least one inflection point.

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 object-side surface141of the fourth lens element140has at least one inflection point.

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. Each of the object-side surface151and the image-side surface152of the fifth lens element150has at least one inflection point. The image-side surface152of the fifth lens element150has at least one convex shape 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. Each of the object-side surface161and the image-side surface162of the sixth lens element160has at least one inflection point. The image-side surface162of the sixth lens element160has at least one convex shape in an off-axis region thereof.

The filter170is 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element130, the fourth lens element140and the sixth lens element160are all smaller than 25.0. Additionally, each of three lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element130, the fourth lens element140and the sixth lens element160are all smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element130and the sixth lens element160are both smaller than 20.0.

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 and 16.

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=7.69 millimeters (mm), Fno=2.29, HFOV=20.0 degrees (deg.).

When the Abbe number of the third lens element130is V3, the Abbe number of the fourth lens element140is V4, and an Abbe number of the sixth lens element160is V6, the following conditions are satisfied: V3=19.5; V4=21.5; and V3+V4+V6=60.5.

When a maximum value among all refractive indices of the six lens elements of the imaging lens assembly is Nmax, the following condition is satisfied: Nmax=1.669. In this embodiment, the refractive indices of the third lens element130and the sixth lens element160, which are both larger than the refractive indices of the first lens element110, the second lens element120, the fourth lens element140and the fifth lens element150. Accordingly, the refractive index of the third lens element130or that of the sixth lens element160is Nmax.

When a central thickness of the fourth lens element140is CT4, and an axial distance between the third lens element130and the fourth lens element140is T34, the following condition is satisfied: CT4/T34=0.32. 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.

When the axial distance between the third lens element130and the fourth lens element140is T34, an axial distance between the fourth lens element140and the fifth lens element150is T45, and an axial distance between the fifth lens element150and the sixth lens element160is T56, the following conditions are satisfied: T45/T34=0.25; and T56/T34=0.32.

When a central thickness of the first lens element110is CT1, the axial distance between the third lens element130and the fourth lens element140is T34, and the axial distance between the fourth lens element140and the fifth lens element150is T45, the following condition is satisfied: (CT1+T34)/T45=5.8.

When a maximum value among all axial distances between each of the six adjacent lens elements is ATmax, and a maximum value among all central thicknesses of the six lens elements is CTmax, the following condition is satisfied: ATmax/CTmax=2.24. In this embodiment, ATmax is equal to 1.706 mm, which is the axial distance between the third lens element130and the fourth lens element140; CTmax is equal to 0.763 mm, which is the central thickness of the first lens element110.

When the axial distance between the fourth lens element140and the fifth lens element150is T45, the central thickness of the fourth lens element140is CT4, and a central thickness of the fifth lens element150is CT5, the following condition is satisfied: T45/(CT4+CT5)=0.54.

When a central thickness of the first lens element110is CT1, an axial distance between the first lens element110and the second lens element120is T12, an axial distance between the second lens element120and the third lens element130is T23, the axial distance between the third lens element130and the fourth lens element140is T34, and the axial distance between the fourth lens element140and the fifth lens element150is T45, the following condition is satisfied: (CT1+T12)/(T23+T34+T45)=0.51.

When a curvature radius of the image-side surface152of the fifth lens element150is R10, and a curvature radius of the image-side surface162of the sixth lens element160is R12, the following condition is satisfied: R10/R12=0.76.

When a curvature radius of the object-side surface111of the first lens element110is R1, and the curvature radius of the image-side surface162of the sixth lens element160is R12, the following condition is satisfied: (R1−R12)/(R1+R12)=−0.34.

When the focal length of the imaging lens assembly is f, and the curvature radius of the object-side surface111of the first lens element110is R1, the following condition is satisfied: f/R1=3.45.

When the focal length of the imaging lens assembly is f, and a curvature radius of the object-side surface151of the fifth lens element150is R9, the following condition is satisfied: f/R9=−1.01.

When the focal length of the imaging lens assembly is f, and the curvature radius of the image-side surface162of the sixth lens element160is R12, the following condition is satisfied: f/R12=1.70.

When a focal length of the second lens element120is f2, and a focal length of the third lens element130is f3, the following condition is satisfied: f2/f3=−1.58.

When the focal length of the second lens element120is f2, and a focal length of the fifth lens element150is f5, the following condition is satisfied: f2/f5=−2.21.

When an axial distance between the aperture stop100and the image-side surface162of the sixth lens element160is SD, and 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: SD/TD=0.87.

When an 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 maximum image height of the imaging lens assembly is ImgH, the following condition is satisfied: f/ImgH=2.66.

When the focal length of the imaging lens assembly is f, and an entrance pupil diameter of the imaging lens assembly is EPD, the following condition is satisfied: f/EPD=2.29.

When a 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: Y62/Y11=1.40.

When a vertical distance between a non-axial critical point on the image-side surface152of the fifth lens element150and an optical axis is Yc52, and the focal length of the imaging lens assembly is f, the following condition is satisfied: Yc52/f=0.13.

When the focal length of the imaging lens assembly is f, a curvature radius of an object-side surface of one lens element of the six lens elements is Rf, and a curvature radius of an image-side surface of the lens element of the six lens elements is Rr, one lens element (the fourth lens element140) in this embodiment satisfies the following condition: |f/Rf|+|f/Rr|<1.0. The values of |f/Rf|+|f/Rr| for the six lens elements (110,120,130,140,150and160) are respectively presented in the following paragraph.

When the focal length of the imaging lens assembly is f, the curvature radius of the object-side surface111of the first lens element110is R1, and a curvature radius of the image-side surface112of the first lens element110is R2, the following condition is satisfied: |f/R1|+|f/R2|=4.51. When a curvature radius of the object-side surface121of the second lens element120is R3, and a curvature radius of the image-side surface122of the second lens element120is R4, the following condition is satisfied: |f/R3|+|f/R4|=1.50. When a curvature radius of the object-side surface131of the third lens element130is R5, and a curvature radius of the image-side surface132of the third lens element130is R6, the following condition is satisfied: |f/R5|+|f/R6|=4.62. When a curvature radius of the object-side surface141of the fourth lens element140is R7, and a curvature radius of the image-side surface142of the fourth lens element140is R8, the following condition is satisfied: |f/R7|+|f/R8|=0.77. When the curvature radius of the object-side surface151of the fifth lens element150is R9, and the curvature radius of the image-side surface152of the fifth lens element150is R10, the following condition is satisfied: |f/R9|+|f/R10|=3.26. When a curvature radius of the object-side surface161of the sixth lens element160is R11, and the curvature radius of the image-side surface162of the sixth lens element160is R12, the following condition is satisfied: |f/R11|+|f/R12|=3.73.

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, an aperture stop200, a first lens element210, a second lens element220, a third lens element230, a fourth lens element240, a fifth lens element250, a sixth lens element260, a filter270and an image surface280. The imaging lens assembly includes six single and non-cemented lens elements (210,220,230,240,250and260) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 concave 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 positive refractive power has an object-side surface221being convex in a paraxial region thereof and an image-side surface222being convex 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 object-side surface221of the second lens element220has at least one inflection point.

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 plastic material and has the object-side surface231and the image-side surface232being both aspheric. The object-side surface231of the third lens element230has at least one inflection point.

The fourth lens element240with negative refractive power has an object-side surface241being convex in a paraxial region thereof and an image-side surface242being concave in a paraxial region thereof. The fourth lens element240is made of plastic material and has the object-side surface241and the image-side surface242being both aspheric. Each of the object-side surface241and the image-side surface242of the fourth lens element240has at least one inflection point. The image-side surface242of the fourth lens element240has at least one convex shape in an off-axis region thereof.

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 inflection point. The image-side surface252of the fifth lens element250has at least one convex shape 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 convex 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 object-side surface261of the sixth lens element260has at least one inflection point.

The filter270is 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element230, the fourth lens element240and the sixth lens element260are all smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element230and the sixth lens element260are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element230and the sixth lens element260are both smaller than 20.0.

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 first lens element310, an aperture stop300, a second lens element320, a third lens element330, a fourth lens element340, a fifth lens element350, a sixth lens element360, a filter370and an image surface380. The imaging lens assembly includes six single and non-cemented lens elements (310,320,330,340,350and360) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 plastic material and has the object-side surface311and the image-side surface312being both aspheric.

The second lens element320with positive refractive power has an object-side surface321being convex in a paraxial region thereof and an image-side surface322being convex 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 image-side surface322of the second lens element320has at least one inflection point.

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 plastic material and has the object-side surface331and the image-side surface332being both aspheric. The object-side surface331of the third lens element330has at least one inflection point.

The fourth lens element340with negative refractive power has an object-side surface341being convex in a paraxial region thereof and an image-side surface342being concave 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. Each of the object-side surface341and the image-side surface342of the fourth lens element340has at least one inflection point. The image-side surface342of the fourth lens element340has at least one convex shape in an off-axis region thereof.

The fifth lens element350with negative refractive power has an object-side surface351being concave 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 image-side surface352of the fifth lens element350has at least one inflection point. The image-side surface352of the fifth lens element350has at least one convex shape in an off-axis region thereof.

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. Each of the object-side surface361and the image-side surface362of the sixth lens element360has at least one inflection point. The image-side surface362of the sixth lens element360has at least one convex shape in an off-axis region thereof.

The filter370is 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element330, the fourth lens element340and the sixth lens element360are all smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element330and the sixth lens element360are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element330and the sixth lens element360are both smaller than 20.0.

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 first lens element410, a second lens element420, an aperture stop400, a third lens element430, a fourth lens element440, a fifth lens element450, a sixth lens element460, a filter470and an image surface480. The imaging lens assembly includes six single and non-cemented lens elements (410,420,430,440,450and460) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 positive refractive power has an object-side surface421being convex in a paraxial region thereof and an image-side surface422being convex 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 object-side surface421of the second lens element420has at least one inflection point.

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 negative refractive power has an object-side surface441being convex in a paraxial region thereof and an image-side surface442being concave in a paraxial region thereof. The fourth lens element440is made of plastic material and has the object-side surface441and the image-side surface442being both aspheric. Each of the object-side surface441and the image-side surface442of the fourth lens element440has at least one inflection point. The image-side surface442of the fourth lens element440has at least one convex shape in an off-axis region thereof.

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 inflection point. The image-side surface452of the fifth lens element450has at least one convex shape 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. Each of the object-side surface461and the image-side surface462of the sixth lens element460has at least one inflection point. The image-side surface462of the sixth lens element460has at least one convex shape in an off-axis region thereof.

The 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element430, the fourth lens element440and the sixth lens element460are all smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element430and the sixth lens element460are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element430and the sixth lens element460are both smaller than 20.0.

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, an aperture stop500, a third lens element530, a fourth lens element540, a fifth lens element550, a sixth lens element560, a filter570and an image surface580. The imaging lens assembly includes six single and non-cemented lens elements (510,520,530,540,550and560) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 positive refractive power has an object-side surface521being convex in a paraxial region thereof and an image-side surface522being convex 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 object-side surface521of the second lens element520has at least one inflection point.

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 object-side surface531of the third lens element530has at least one inflection point.

The fourth lens element540with positive refractive power has an object-side surface541being convex in a paraxial region thereof and an image-side surface542being concave in a paraxial region thereof. The fourth lens element540is made of plastic material and has the object-side surface541and the image-side surface542being both aspheric. Each of the object-side surface541and the image-side surface542of the fourth lens element540has at least one inflection point. The image-side surface542of the fourth lens element540has at least one convex shape in an off-axis region thereof.

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 inflection point. The image-side surface552of the fifth lens element550has at least one convex shape in an off-axis region thereof.

The sixth lens element560with negative refractive power has an object-side surface561being concave 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. Each of the object-side surface561and the image-side surface562of the sixth lens element560has at least one inflection point. The image-side surface562of the sixth lens element560has at least one convex shape in an off-axis region thereof.

The 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element530, the fourth lens element540and the sixth lens element560are all smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element530and the sixth lens element560are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element530and the sixth lens element560are both smaller than 20.0.

In this embodiment, each of two lens elements (the fourth lens element540and the sixth lens element560) satisfies the following condition: |f/Rf|+|f/Rr|<1.0. In detail, a focal length of the imaging lens assembly is f, a curvature radius of the object-side surface541of the fourth lens element540is R7, a curvature radius of the image-side surface542of the fourth lens element540is R8, and |f/R7|+|f/R8|=0.80; a curvature radius of the object-side surface561of the sixth lens element560is R11, a curvature radius of the image-side surface562of the sixth lens element560is R12, and |f/R11|+|f/R12|=0.37.

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, an aperture stop600, a first lens element610, a second lens element620, a third lens element630, a fourth lens element640, a fifth lens element650, a sixth lens element660, a filter670and an image surface680. The imaging lens assembly includes six single and non-cemented lens elements (610,620,630,640,650and660) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 positive refractive power has an object-side surface621being convex in a paraxial region thereof and an image-side surface622being convex 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. Each of the object-side surface621and the image-side surface622of the second lens element620has at least one inflection point.

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 plastic material and has the object-side surface641and the image-side surface642being both aspheric. The object-side surface641of the fourth lens element640has at least one inflection point.

The fifth lens element650with negative refractive power has an object-side surface651being convex 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. Each of the object-side surface651and the image-side surface652of the fifth lens element650has at least one inflection point. The image-side surface652of the fifth lens element650has at least one convex shape in an off-axis region thereof.

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. Each of the object-side surface661and the image-side surface662of the sixth lens element660has at least one convex shape in an off-axis region thereof. The image-side surface662of the sixth lens element660has at least one convex shape in an off-axis region thereof.

The 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element630, the fourth lens element640and the sixth lens element660are all smaller than 25.0. Additionally, each of three lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element630, the fourth lens element640and the sixth lens element660are all smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element630and the sixth lens element660are both smaller than 20.0.

In this embodiment, one lens element (the fourth lens element640) satisfies the following condition: |f/Rf|+|f/Rr|<1.0. In detail, a focal length of the imaging lens assembly is f, a curvature radius of the object-side surface641of the fourth lens element640is R7, a curvature radius of the image-side surface642of the fourth lens element640is R8, and |f/R7|+|f/R8|=0.73.

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, an aperture stop700, a first lens element710, a second lens element720, a third lens element730, a fourth lens element740, a fifth lens element750, a sixth lens element760, a filter770and an image surface780. The imaging lens assembly includes six single and non-cemented lens elements (710,720,730,740,750and760) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 concave 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 positive refractive power has an object-side surface721being convex 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 image-side surface722of the second lens element720has at least one inflection point.

The third lens element730with negative refractive power has an object-side surface731being convex 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 object-side surface731of the third lens element730has at least one inflection point.

The fourth lens element740with negative 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 image-side surface742of the fourth lens element740has at least one inflection point. The image-side surface742of the fourth lens element740has at least one convex shape in an off-axis region thereof.

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. Each of the object-side surface751and the image-side surface752of the fifth lens element750has at least one inflection point. The image-side surface752of the fifth lens element750has at least one convex shape 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 convex 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 object-side surface761of the sixth lens element760has at least one inflection point.

The 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.

In this embodiment, among the six lens elements, each of three lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element730, the fourth lens element740and the sixth lens element760are all smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element730and the sixth lens element760are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element730and the sixth lens element760are both smaller than 20.0.

In this embodiment, one lens element (the sixth lens element760) satisfies the following condition: |f/Rf|+|f/Rr|<1.0. In detail, a focal length of the imaging lens assembly is f, a curvature radius of the object-side surface761of the sixth lens element760is R11, a curvature radius of the image-side surface762of the sixth lens element760is R12, and |f/R11|+|f/R12|=0.27.

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, an aperture stop800, a first lens element810, a second lens element820, a third lens element830, a fourth lens element840, a fifth lens element850, a sixth lens element860, a filter870and an image surface880. The imaging lens assembly includes six single and non-cemented lens elements (810,820,830,840,850and860) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 image-side surface812of the first lens element810has at least one inflection point.

The second lens element820with positive 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. Each of the object-side surface821and the image-side surface822of the second lens element820has at least one inflection point.

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 object-side surface831of the third lens element830has at least one inflection point.

The fourth lens element840with positive refractive power has an object-side surface841being concave in a paraxial region thereof and an image-side surface842being convex 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. Each of the object-side surface841and the image-side surface842of the fourth lens element840has at least one inflection point in an off-axis region thereof.

The fifth lens element850with negative refractive power has an object-side surface851being convex 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. Each of the object-side surface851and the image-side surface852of the fifth lens element850has at least one inflection point. The image-side surface852of the fifth lens element850has at least one convex shape in an off-axis region thereof.

The sixth lens element860with negative 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. Each of the object-side surface861and the image-side surface862of the sixth lens element860has at least one inflection point. The image-side surface862of the sixth lens element860has at least one convex shape in an off-axis region thereof.

The 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.

In this embodiment, among the six lens elements, each of two lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element830and the fourth lens element840are both smaller than 25.0. Additionally, one lens element has an Abbe number smaller than 22.0. In detail, the Abbe number of the third lens element830is smaller than 22.0. Furthermore, one lens element has an Abbe number smaller than 20.0. In detail, the Abbe number of the third lens element830is smaller than 20.0.

In this embodiment, one lens element (the second lens element820) satisfies the following condition: |f/Rf|+|f/Rr|<1.0. In detail, a focal length of the imaging lens assembly is f, a curvature radius of the object-side surface821of the second lens element820is R3, a curvature radius of the image-side surface822of the second lens element820is R4, and |f/R3|+|f/R4|=0.90.

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, an aperture stop900, a first lens element910, a second lens element920, a third lens element930, a fourth lens element940, a fifth lens element950, a sixth lens element960, a filter970and an image surface980. The imaging lens assembly includes six single and non-cemented lens elements (910,920,930,940,950and960) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent 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 positive refractive power has an object-side surface921being convex in a paraxial region thereof and an image-side surface922being convex 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 image-side surface922of the second lens element920has at least one inflection point.

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 object-side surface931of the third lens element930has at least one inflection point.

The fourth lens element940with positive refractive power has an object-side surface941being concave in a paraxial region thereof and an image-side surface942being convex in a paraxial region thereof. The fourth lens element940is made of plastic material and has the object-side surface941and the image-side surface942being both aspheric. Each of the object-side surface941and the image-side surface942of the fourth lens element940has at least one inflection point.

The fifth lens element950with negative refractive power has an object-side surface951being convex in a paraxial region thereof and an image-side surface952being concave 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. Each of the object-side surface951and the image-side surface952of the fifth lens element950has at least one inflection point. The image-side surface952of the fifth lens element950has at least one convex shape in an off-axis region thereof.

The sixth lens element960with negative 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. Each of the object-side surface961and the image-side surface962of the sixth lens element960has at least one inflection point. The image-side surface962of the sixth lens element960has at least one convex shape in an off-axis region thereof.

The 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.

In this embodiment, among the six lens elements, each of two lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element930and the fourth lens element940are both smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element930and the fourth lens element940are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element930and the fourth lens element940are both smaller than 20.0.

In this embodiment, one lens element (the second lens element920) satisfies the following condition: |f/Rf|+|f/Rr|<1.0. In detail, a focal length of the imaging lens assembly is f, a curvature radius of the object-side surface921of the second lens element920is R3, a curvature radius of the image-side surface922of the second lens element920is R4, and |f/R3|+|f/R4|=0.77.

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 an image capturing unit according to the 10th embodiment of the present disclosure.FIG. 20shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 10th embodiment. InFIG. 19, the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor1090. The imaging lens assembly includes, in order from an object side to an image side, a first lens element1010, an aperture stop1000, a second lens element1020, a third lens element1030, a fourth lens element1040, a fifth lens element1050, a sixth lens element1060, a filter1070and an image surface1080. The imaging lens assembly includes six single and non-cemented lens elements (1010,1020,1030,1040,1050and1060) with no additional lens element disposed between each of the adjacent six lens elements, wherein there is an air gap between every adjacent lens elements.

The first lens element1010with negative refractive power has an object-side surface1011being convex in a paraxial region thereof and an image-side surface1012being concave in a paraxial region thereof. The first lens element1010is made of plastic material and has the object-side surface1011and the image-side surface1012being both aspheric. Each of the object-side surface1011and the image-side surface1012of the first lens element1010has at least one inflection point.

The second lens element1020with positive refractive power has an object-side surface1021being convex in a paraxial region thereof and an image-side surface1022being convex in a paraxial region thereof. The second lens element1020is made of plastic material and has the object-side surface1021and the image-side surface1022being both aspheric. The image-side surface1022of the second lens element1020has at least one inflection point.

The third lens element1030with negative refractive power has an object-side surface1031being convex in a paraxial region thereof and an image-side surface1032being concave in a paraxial region thereof. The third lens element1030is made of plastic material and has the object-side surface1031and the image-side surface1032being both aspheric. The object-side surface1031of the third lens element1030has at least one inflection point.

The fourth lens element1040with positive refractive power has an object-side surface1041being concave in a paraxial region thereof and an image-side surface1042being convex in a paraxial region thereof. The fourth lens element1040is made of plastic material and has the object-side surface1041and the image-side surface1042being both aspheric. Each of the object-side surface1041and the image-side surface1042of the fourth lens element1040has at least one inflection point.

The fifth lens element1050with negative refractive power has an object-side surface1051being convex in a paraxial region thereof and an image-side surface1052being concave in a paraxial region thereof. The fifth lens element1050is made of plastic material and has the object-side surface1051and the image-side surface1052being both aspheric. Each of the object-side surface1051and the image-side surface1052of the fifth lens element1050has at least one inflection point. The image-side surface1052of the fifth lens element1050has at least one convex shape in an off-axis region thereof.

The sixth lens element1060with negative refractive power has an object-side surface1061being convex in a paraxial region thereof and an image-side surface1062being concave in a paraxial region thereof. The sixth lens element1060is made of plastic material and has the object-side surface1061and the image-side surface1062being both aspheric. Each of the object-side surface1061and the image-side surface1062of the sixth lens element1060has at least one inflection point. The image-side surface1062of the sixth lens element1060has at least one convex shape in an off-axis region thereof.

The filter1070is made of glass material and located between the sixth lens element1060and the image surface1080, and will not affect the focal length of the imaging lens assembly. The image sensor1090is disposed on or near the image surface1080of the imaging lens assembly.

In this embodiment, among the six lens elements, each of two lens elements has an Abbe number smaller than 25.0. In detail, the Abbe numbers of the third lens element1030and the fourth lens element1040are both smaller than 25.0. Additionally, each of two lens elements has an Abbe number smaller than 22.0. In detail, the Abbe numbers of the third lens element1030and the fourth lens element1040are both smaller than 22.0. Furthermore, each of two lens elements has an Abbe number smaller than 20.0. In detail, the Abbe numbers of the third lens element1030and the fourth lens element1040are both smaller than 20.0.

The detailed optical data of the 10th embodiment are shown in Table 19 and the aspheric surface data are shown in Table 20 below.

Moreover, these parameters can be calculated from Table 19 and Table 20 as the following values and satisfy the following conditions:

FIG. 21is a perspective view of an image capturing unit according to the 11th embodiment of the present disclosure. In this embodiment, an image capturing unit10″ is a camera module including a lens unit11, a driving device12, an image sensor13and an image stabilizer14. The lens unit11includes the imaging lens assembly disclosed in the 1st embodiment, a barrel and a holder member (their reference numerals are omitted) for holding the imaging lens assembly. The imaging light converges in the lens unit11of the image capturing unit10″ to generate an image with the driving device12utilized for focusing the image on the image sensor13, and the generated image is then digitally transmitted to other electronic component for further processing.

The driving device12can 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 device12is favorable for obtaining a better imaging position of the lens unit11, so that a clear image of the imaged object can be captured by the lens unit11with different object distances. The image sensor13(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 stabilizer14, such as an accelerometer, a gyro sensor and a Hall Effect sensor, is configured to work with the driving device12to provide optical image stabilization (01S). The driving device12working with the image stabilizer14is favorable for compensating for pan and tilt of the lens unit11to 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 the image quality while in motion or low-light conditions.

FIG. 22is one perspective view of an electronic device according to the 12th embodiment of the present disclosure.FIG. 23is another perspective view of the electronic device inFIG. 22.FIG. 24is a block diagram of the electronic device inFIG. 22. In this embodiment, an electronic device20is a smartphone including an image capturing unit10, the image capturing unit10″ disclosed in the 11th embodiment, a flash module21, a focus assist module22, an image signal processor23, a user interface24and an image software processor25. In this embodiment, the image capturing unit10is a wide-angle image capturing unit having a relatively large field of view, and the image capturing unit10″ is a telephoto image capturing unit having a relatively small field of view; that is, in this embodiment, the image capturing units10,10″ have different fields of view from each other, but the disclosure is not limited thereto. For example, the two image capturing units10,10″ can have the same field of view. Furthermore, in this embodiment, the electronic device20includes two image capturing units10,10″, but the disclosure is not limited thereto. In some cases, the electronic device20can include only one image capturing unit10or one image capturing unit10″. In some cases, the electronic device20can include more than two image capturing units of different configurations.

When a user captures images of an object26through the user interface24, the light rays converge in the image capturing unit10″ to generate an image, and the flash module21is activated for light supplement. The focus assist module22detects the object distance of the imaged object26to achieve fast auto focusing. The image signal processor23is configured to optimize the captured image to improve the image quality. The light beam emitted from the focus assist module22can be either conventional infrared or laser. The user interface24can be a touch screen or a physical button. The user is able to interact with the user interface24and the image software processor25having multiple functions to capture images and complete image processing.

The smartphone in this embodiment is only exemplary for showing the image capturing unit10″ of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The image capturing unit10″ can be optionally applied to optical systems with a movable focus. Furthermore, the imaging lens assembly of the image capturing unit10″ features 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.