Optical imaging lens assembly, image capturing unit and electronic device

An optical imaging lens assembly includes seven 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, a sixth lens element and a seventh lens element. Each of the seven lens elements of the optical imaging lens assembly has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens element of the optical imaging lens assembly has at least one aspheric lens surface having at least one inflection point. The object-side surface of the seventh lens element is concave in a paraxial region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 108109547, filed on Mar. 20, 2019, which is incorporated by reference herein in its entirety.

BACKGROUND

Technical Field

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

Description of Related Art

With the development of semiconductor manufacturing technology, the performance of image sensors has been improved, and the pixel size thereof has been scaled down. Therefore, featuring high image quality becomes one of the indispensable features of an optical system nowadays.

Furthermore, due to the rapid changes in technology, electronic devices equipped with optical systems are trending towards multi-functionality for various applications, and therefore the functionality requirements for the optical systems have been increasing. However, it is difficult for a conventional optical system to obtain a balance among the requirements such as high image quality, low sensitivity, a proper aperture size, miniaturization and a desirable field of view.

SUMMARY

According to one aspect of the present disclosure, an optical imaging lens assembly includes seven lens elements. The seven 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, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side.

At least one lens element of the optical imaging lens assembly has at least one aspheric lens surface having at least one inflection point. The object-side surface of the seventh lens element is concave in a paraxial region thereof.

When an Abbe number of the sixth lens element is V6, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, a focal length of the optical imaging lens assembly is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a central thickness of the fifth lens element is CT5, a central thickness of the sixth lens element is CT6, an axial distance between the object-side surface of the first lens element and an image surface is TL, and a maximum image height of the optical imaging lens assembly is ImgH, the following conditions are satisfied:
12.0<V6<34.0;
1.60<|R14/R13|;
|f/f4|+|f/f5|+|f/f6|<1.35;
0.10<CT5/CT6<0.75; and
0.80<TL/ImgH<1.70.

According to another aspect of the present disclosure, an optical imaging lens assembly includes seven lens elements. The seven 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, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side.

At least one lens element of the optical imaging lens assembly has at least one aspheric lens surface having at least one inflection point. The object-side surface of the seventh lens element is concave in a paraxial region thereof.

When an Abbe number of the sixth lens element is V6, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, a focal length of the optical imaging lens assembly is f, a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a central thickness of the fifth lens element is CT5, and an axial distance between the fifth lens element and the sixth lens element is T56, the following conditions are satisfied:
10.0<V6<50.0;
1.60<|R14/R13|;
|f/f4|+|f/f5|+|f/f6|<1.20;
0.10<CT5/T56<1.25; and
|f/f1|<1.80.

According to another aspect of the present disclosure, an optical imaging lens assembly includes seven lens elements. The seven 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, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side.

At least one lens element of the optical imaging lens assembly has at least one aspheric lens surface having at least one inflection point. The object-side surface of the seventh lens element is concave in a paraxial region thereof.

When an Abbe number of the sixth lens element is V6, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, a focal length of the optical imaging lens assembly is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, the following conditions are satisfied:
12.0<V6<34.0;
2.20<|R14/R13|;
|f/f4|+|f/f5|+|f/f6|<1.20; and
2.80<|R7|/TD.

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

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

DETAILED DESCRIPTION

An optical imaging lens assembly includes seven lens elements. The seven 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, a sixth lens element and a seventh lens element. Each of the seven lens elements of the optical imaging lens assembly has an object-side surface facing toward the object side and an image-side surface facing toward the image side.

The first lens element can have positive refractive power. Therefore, it is favorable for providing the positive refractive power required for reducing the size of the optical imaging lens assembly. The object-side surface of the first lens element can be convex in a paraxial region thereof. Therefore, it is favorable for light rays at different regions within the field of view to travel into the optical imaging lens assembly evenly. The image-side surface of the first lens element can be concave in a paraxial region thereof. Therefore, it is favorable for correcting astigmatism.

The second lens element can have negative refractive power. Therefore, it is favorable for correcting aberrations generated due to the miniaturization of the optical imaging lens assembly. The image-side surface of the second lens element can be concave in a paraxial region thereof. Therefore, it is favorable for adjusting the refractive power of the second lens element.

The third lens element can have positive refractive power. Therefore, it is favorable for balancing the positive refractive power distribution of the optical imaging lens assembly so as to reduce aberrations generated by a single lens element. The object-side surface of the third lens element can be convex in a paraxial region thereof. Therefore, it is favorable for the second and third lens elements to collaborate with each other so as to correct aberrations.

The object-side surface of the seventh lens element is concave in a paraxial region thereof. Therefore, it is favorable for having a proper incident angle of light rays on the seventh lens element so as to improve peripheral image quality on the image surface, thereby obtaining a wide angle configuration. The seventh lens element can have negative refractive power. Therefore, it is favorable for the optical imaging lens assembly to have a proper back focal length.

According to the present disclosure, at least one lens element of the optical imaging lens assembly has at least one aspheric lens surface having at least one inflection point. Therefore, it is favorable for increasing the shape variation of the lens elements so as to reduce the size of the optical imaging lens assembly and improve image quality. Moreover, each of at least two lens elements of the optical imaging lens assembly can have at least one aspheric lens surface having at least one inflection point. Moreover, each of at least three lens elements of the optical imaging lens assembly can have at least one aspheric lens surface having at least one inflection point. Moreover, at least one of the object-side surface and the image-side surface of the sixth lens element can be aspheric and have at least one inflection point. Therefore, it is favorable for increasing the shape variation of the sixth lens element so as to improve peripheral image quality. Moreover, at least one of the object-side surface and the image-side surface of the seventh lens element can be aspheric and have at least one inflection point. Therefore, it is favorable for increasing the shape variation of the seventh lens element so as to improve peripheral image quality, and adjusting the size distribution of the optical imaging lens assembly. Please refer toFIG. 21, which shows a schematic view of inflection points P of the second lens element120, the third lens element130, the fourth lens element140, the fifth lens element150, the sixth lens element160and the seventh lens element170according to the 1st embodiment of the present disclosure.

According to the present disclosure, as to at least one lens element of the optical imaging lens assembly, the object-side surface and the image-side surface can be both aspheric, and each of the object-side surface and the image-side surface can have at least one inflection point. Therefore, it is favorable for further increasing the shape variation of the lens elements so as to correct off-axis aberrations. Moreover, as to each of at least two lens elements of the optical imaging lens assembly, the object-side surface and the image-side surface can be both aspheric, and each of the object-side surface and the image-side surface can have at least one inflection point. Moreover, the object-side surface and the image-side surface of the sixth lens element can be both aspheric, and each of the object-side surface and the image-side surface of the sixth lens element can have at least one inflection point. Therefore, it is favorable for further increasing the shape variation of the sixth lens element so as to correct aberrations such as off-axis field curvature and increase peripheral illuminance on the image surface.

When an Abbe number of the sixth lens element is V6, the following condition is satisfied: 10.0<V6<50.0. Therefore, it is favorable for adjusting the material of the sixth lens element so as to correct chromatic aberration for reducing colour cast. Moreover, the following condition can also be satisfied: 11.0<V6<42.0. Moreover, the following condition can also be satisfied: 12.0<V6<34.0. Moreover, the following condition can also be satisfied: 13.0<V6<30.0. Moreover, the following condition can also be satisfied: 14.0<V6<25.0.

When a curvature radius of the object-side surface of the seventh lens element is R13, and a curvature radius of the image-side surface of the seventh lens element is R14, the following condition is satisfied: 1.60<|R14/R13|. Therefore, it is favorable for adjusting the lens shape of the seventh lens element so as to correct off-axis aberrations and increase peripheral illuminance on the image surface, thereby obtaining a wide angel configuration. Moreover, the following condition can also be satisfied: 2.20<|R14/R13|. Moreover, the following condition can also be satisfied: 5.00<|R14/R13|. Moreover, the following condition can also be satisfied: 10.0<|R14/R13|.

When a focal length of the optical imaging lens assembly is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and a focal length of the sixth lens element is f6, the following condition is satisfied: |f/f4|+|f/f5|+|f/f6|<1.35. Therefore, it is favorable for the fourth through sixth lens elements to collaborate together so as to adjust the size distribution and reduce aberrations such as spherical aberration generated by a single lens element. Moreover, the following condition can also be satisfied: |f/f4|+|f/f5|+|f/f6|<1.20. Moreover, the following condition can also be satisfied: |f/f4|+|f/f5|+|f/f6|<1.00. Moreover, the following condition can also be satisfied: |f/f4|+|f/f5|+|f/f6|<0.75.

When a central thickness of the fifth lens element is CT5, and a central thickness of the sixth lens element is CT6, the following condition can be satisfied: 0.10<CT5/CT6<0.75. Therefore, it is favorable for the fifth and sixth lens elements to collaborate with each other so as to correct aberrations. Moreover, the following condition can also be satisfied: 0.20<CT5/CT6<0.65.

When an axial distance between the object-side surface of the first lens element and an image surface is TL, and a maximum image height of the optical 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: 0.80<TL/ImgH<1.70. Therefore, it is favorable for obtaining a balance between reducing the total track length and enlarging the image surface of the optical imaging lens assembly. Moreover, the following condition can also be satisfied: 1.00<TL/ImgH<1.50.

When the central thickness of the fifth lens element is CT5, and an axial distance between the fifth lens element and the sixth lens element is T56, the following condition can be satisfied: 0.10<CT5/T56<1.25. Therefore, it is favorable for adjusting the central thickness of the fifth lens element and the axial distance between the fifth lens element and the sixth lens element so as to reduce the size of the optical imaging lens assembly. Moreover, the following condition can also be satisfied: 0.25<CT5/T56<1.00.

When the focal length of the optical imaging lens assembly is f, and a focal length of the first lens element is f1, the following condition can be satisfied: |f/f1|<1.80. Therefore, it is favorable for preventing overly strong refractive power of the first lens element, thereby preventing excessive aberrations. Moreover, the following condition can also be satisfied: |f/f1|<1.60. Moreover, the following condition can also be satisfied: |f/f1|<1.40.

When a curvature radius of the object-side surface of the fourth lens element is R7, and an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, the following condition can be satisfied: 2.80<|R7|/TD. Therefore, it is favorable for adjusting the size distribution of the optical imaging lens assembly so as to obtain a balance between the field of view and the product size. Moreover, the following condition can also be satisfied: 3.60<|R7|/TD.

When the maximum image height of the optical imaging lens assembly is ImgH, and an axial distance between the image-side surface of the seventh lens element and the image surface is BL, the following condition can be satisfied: 5.0<ImgH/BL. Therefore, it is favorable for adjusting the image surface size and back focal length so as to have a proper incident angle of light on the image surface, thereby improving the response efficiency of an image sensor.

When an Abbe number of the second lens element is V2, the following condition can be satisfied: 10.0<V2<34.0. Therefore, it is favorable for adjusting the material of the second lens element so as to reduce chromatic aberration. Moreover, the following condition can also be satisfied: 14.0<V2<28.0.

When an Abbe number of the fourth lens element is V4, the following condition can be satisfied: 10.0<V4<34.0. Therefore, it is favorable for adjusting the material of the fourth lens element so as to reduce chromatic aberration. Moreover, the following condition can also be satisfied: 14.0<V4<23.5.

When an axial distance between the sixth lens element and the seventh lens element is T67, and the central thickness of the sixth lens element is CT6, the following condition can be satisfied: 0<T67/CT6<1.0. Therefore, it is favorable for the sixth and seventh lens elements to collaborate with each other so as to correct off-axis aberrations. Moreover, the following condition can also be satisfied: 0.15<T67/CT6<0.85.

When the focal length of the optical imaging lens assembly is f, and the focal length of the sixth lens element is f6, the following condition can be satisfied: −0.22<f/f6<0.35. Therefore, it is favorable for the sixth lens element to have proper refractive power so as to correct off-axis aberrations. Moreover, the following condition can also be satisfied: −0.17<f/f6<0.30.

When the Abbe number of the second lens element is V2, the Abbe number of the fourth lens element is V4, and the Abbe number of the sixth lens element is V6, the following condition can be satisfied: 30.0<V2+V4+V6<90.0. Therefore, it is favorable for selecting proper materials for manufacturing the lens elements in the optical imaging lens assembly so as to correct aberrations such as chromatic aberration. Moreover, the following condition can also be satisfied: 45.0<V2+V4+V6<75.0.

When the focal length of the optical imaging lens assembly is f, and the focal length of the fourth lens element is f4, the following condition can be satisfied: −0.50<f/f4<0.32. Therefore, it is favorable for balancing the refractive power distribution on the object side and the image side of the optical imaging lens assembly. Moreover, the following condition can also be satisfied: −0.40<f/f4<0.18.

When an Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, the Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, an Abbe number of the seventh lens element is V7, an Abbe number of the i-th lens element is Vi, a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the fifth lens element is N5, a refractive index of the sixth lens element is N6, a refractive index of the seventh lens element is N7, and a refractive index of the i-th lens element is Ni, at least one lens element of the optical imaging lens assembly can satisfy the following condition: 4.50<Vi/Ni<11.8, wherein i=1, 2, 3, 4, 5, 6 or 7. Therefore, it is favorable for providing a proper lens material distribution of the optical imaging lens assembly so as to further correct aberrations. Moreover, at least two lens elements of the optical imaging lens assembly can satisfy the following condition: 4.50<Vi/Ni<11.8, wherein i=1, 2, 3, 4, 5, 6 or 7. Moreover, at least three lens elements of the optical imaging lens assembly can satisfy the following condition: 4.50<Vi/Ni<11.8, wherein i=1, 2, 3, 4, 5, 6 or 7.

When the Abbe number of the fifth lens element is V5, the following condition can be satisfied: 10.0<V5<65.0. Therefore, it is favorable for adjusting the material of the fifth lens element so as to reduce material costs. Moreover, the following condition can also be satisfied: 30.0<V5<60.0.

When the focal length of the optical imaging lens assembly is f, and the focal length of the fifth lens element is f5, the following condition can be satisfied: −0.33<f/f5<0.75. Therefore, it is favorable for adjusting the refractive power of the fifth lens element so as to provide required size of the optical imaging lens assembly at the image side. Moreover, the following condition can also be satisfied: −0.28<f/f5<0.45.

When the axial distance between the object-side surface of the first lens element and the image surface is TL, the following condition can be satisfied: 2.0 [mm]<TL<8.5 [mm]. Therefore, it is favorable for the optical imaging lens assembly to have a proper total track length for various applications. Moreover, the following condition can also be satisfied: 3.5 [mm]<TL<7.0 [mm].

When the axial distance between the object-side surface of the first lens element and the image surface is TL, and the focal length of the optical imaging lens assembly is f, the following condition can be satisfied: 0.70<TL/f<1.30. Therefore, it is favorable for obtaining a balance between the field of view and the product size.

When half of a maximum field of view of the optical imaging lens assembly is HFOV, the following condition can be satisfied: 32.5 [deg.]<HFOV<45.0 [deg.]. Therefore, it is favorable for obtaining a wide angle configuration and preventing distortion caused by overly large field of view.

When a sum of central thicknesses of all lens elements of the optical imaging lens assembly is ΣCT, and a sum of axial distances between each of all adjacent lens elements of the optical imaging lens assembly is ΣAT, the following condition can be satisfied: 1.50<ΣCT/ΣAT<2.30. Therefore, it is favorable for adjusting the distribution of the lens elements so as to reduce the size of the optical imaging lens assembly.

When an axial distance between the first lens element and the second lens element is T12, and the axial distance between the sixth lens element and the seventh lens element is T67, the following condition can be satisfied: 0.35<T12/T67<2.45. Therefore, it is favorable for adjusting the distribution of lens elements on the object side and the image side so as to obtain a balance among the field of view, size and image quality of the optical imaging lens assembly. Moreover, the following condition can also be satisfied: 0.45<T12/T67<1.70.

When a curvature radius of the object-side surface of the first lens element is R1, and a curvature radius of the image-side surface of the first lens element is R2, the following condition can be satisfied: 1.00<|R2/R1|<8.00. Therefore, it is favorable for adjusting the surface shape of the first lens element so as to provide proper refractive power of the first lens element. Moreover, the following condition can also be satisfied: 1.60<|R2/R1|<5.50.

When the Abbe number of the third lens element is V3, the following condition can be satisfied: 10.0<V3<65.0. Therefore, it is favorable for adjusting the material of the third lens element so as to reduce material costs. Moreover, the following condition can also be satisfied: 30.0<V3<60.0.

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

According to the present disclosure, the lens elements of the optical imaging lens assembly can be made of either glass or plastic material. When the lens elements are made of glass material, the refractive power distribution of the optical imaging lens assembly may be more flexible. The glass lens element can either be made by grinding or molding. 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, which allows more control variables for eliminating aberrations thereof, the required number of the lens elements can be reduced, and the total track length of the optical imaging lens assembly can be effectively shortened. The aspheric surfaces may be formed by plastic injection molding or glass molding.

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

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

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

According to the present disclosure, 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.

According to the present disclosure, an image surface of the optical 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 optical 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 optical imaging lens assembly and the image surface for correction of aberrations such as field curvature. The optical properties of the image correction unit, such as curvature, thickness, index of refraction, position and surface shape (convex or concave surface with spherical, aspheric, diffractive or Fresnel types), can be adjusted according to the design of 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 optical imaging lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop. Said glare stop or said field stop is set for eliminating the stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configured as a front stop or a middle stop. A front stop disposed between an imaged object and the first lens element can provide a longer distance between an exit pupil of the optical 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 optical imaging lens assembly and thereby provides a wider field of view for the same.

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

FIG. 1is a schematic view of an image capturing unit according to the 1st embodiment of the present disclosure.FIG. 2shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 1st embodiment. InFIG. 1, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor195. The optical 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 stop101, a third lens element130, a fourth lens element140, a fifth lens element150, a sixth lens element160, a seventh lens element170, a filter180and an image surface190. The optical imaging lens assembly includes seven lens elements (110,120,130,140,150,160and170) with no additional lens element disposed between each of the adjacent seven 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 negative refractive power has an object-side surface121being concave in a paraxial region thereof and an image-side surface122being concave in a paraxial region thereof. The second lens element120is made of plastic material and has the object-side surface121and the image-side surface122being both aspheric. The object-side surface121of the second lens element120has one inflection point in an off-axis region thereof.

The third lens element130with positive 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 image-side surface132of the third lens element130has one inflection point in an off-axis region thereof.

The fourth lens element140with negative refractive power has an object-side surface141being concave in a paraxial region thereof and an image-side surface142being concave 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 image-side surface142of the fourth lens element140has two inflection points in an off-axis region thereof.

The fifth lens element150with positive refractive power has an object-side surface151being convex in a paraxial region thereof and an image-side surface152being concave in a paraxial region thereof. The fifth lens element150is made of plastic material and has the object-side surface151and the image-side surface152being both aspheric. The object-side surface151of the fifth lens element150has one inflection point in an off-axis region thereof. The image-side surface152of the fifth lens element150has one inflection point in an off-axis region thereof.

The sixth lens element160with negative refractive power has an object-side surface161being convex in a paraxial region thereof and an image-side surface162being concave in a paraxial region thereof. The sixth lens element160is made of plastic material and has the object-side surface161and the image-side surface162being both aspheric. The object-side surface161of the sixth lens element160has three inflection points in an off-axis region thereof. The image-side surface162of the sixth lens element160has three inflection points in an off-axis region thereof.

The seventh lens element170with negative refractive power has an object-side surface171being concave in a paraxial region thereof and an image-side surface172being convex in a paraxial region thereof. The seventh lens element170is made of plastic material and has the object-side surface171and the image-side surface172being both aspheric. The object-side surface171of the seventh lens element170has two inflection points in an off-axis region thereof. The image-side surface172of the seventh lens element170has one inflection point in an off-axis region thereof.

The filter180is made of glass material and located between the seventh lens element170and the image surface190, and will not affect the focal length of the optical imaging lens assembly. The image sensor195is disposed on or near the image surface190of the optical imaging lens assembly.

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

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

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be, but is not limited to, 4, 6, 8, 10, 12, 14, 16, 18 and 20.

In the optical imaging lens assembly of the image capturing unit according to the 1st embodiment, when a focal length of the optical imaging lens assembly is f, an f-number of the optical imaging lens assembly is Fno, and half of a maximum field of view of the optical imaging lens assembly is HFOV, these parameters have the following values: f=5.91 millimeters (mm), Fno=2.20, HFOV=37.4 degrees (deg.).

When an Abbe number of the second lens element120is V2, the following condition is satisfied: V2=21.8.

When an Abbe number of the third lens element130is V3, the following condition is satisfied: V3=56.0.

When an Abbe number of the fourth lens element140is V4, the following condition is satisfied: V4=18.4.

When an Abbe number of the fifth lens element150is V5, the following condition is satisfied: V5=30.2.

When an Abbe number of the sixth lens element160is V6, the following condition is satisfied: V6=18.4.

When the Abbe number of the second lens element120is V2, the Abbe number of the fourth lens element140is V4, and the Abbe number of the sixth lens element160is V6, the following condition is satisfied: V2+V4+V6=58.6.

When an Abbe number of the first lens element110is V1, and a refractive index of the first lens element110is N1, the following condition is satisfied: V1/N1=39.22.

When the Abbe number of the second lens element120is V2, and a refractive index of the second lens element120is N2, the following condition is satisfied: V2/N2=13.21.

When the Abbe number of the third lens element130is V3, and a refractive index of the third lens element130is N3, the following condition is satisfied: V3/N3=36.26.

When the Abbe number of the fourth lens element140is V4, and a refractive index of the fourth lens element140is N4, the following condition is satisfied: V4/N4=10.91.

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

When the Abbe number of the sixth lens element160is V6, and a refractive index of the sixth lens element160is N6, the following condition is satisfied: V6/N6=10.91.

When an Abbe number of the seventh lens element170is V7, and a refractive index of the seventh lens element170is N7, the following condition is satisfied: V7/N7=39.22.

When a sum of central thicknesses of all lens elements of the optical imaging lens assembly is ΣCT, and a sum of axial distances between each of all adjacent lens elements of the optical imaging lens assembly is ΣAT, the following condition is satisfied: ΣCT/ΣAT=1.59. 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. In addition, in this embodiment, ΣCT is a sum of the central thicknesses of the first lens element110, the second lens element120, the third lens element130, the fourth lens element140, the fifth lens element150, the sixth lens element160and the seventh lens element170; ΣAT is a sum of the axial distance between the first lens element110and the second lens element120, the axial distance between the second lens element120and the third lens element130, the axial distance between the third lens element130and the fourth lens element140, the axial distance between the fourth lens element140and the fifth lens element150, the axial distance between the fifth lens element150and the sixth lens element160, and the axial distance between the sixth lens element160and the seventh lens element170.

When the central thickness of the fifth lens element150is CT5, and the central thickness of the sixth lens element160is CT6, the following condition is satisfied: CT5/CT6=0.40.

When the central thickness of the fifth lens element150is CT5, and the axial distance between the fifth lens element150and the sixth lens element160is T56, the following condition is satisfied: CT5/T56=0.51.

When the axial distance between the first lens element110and the second lens element120is T12, and the axial distance between the sixth lens element160and the seventh lens element170is T67, the following condition is satisfied: T12/T67=0.63.

When the axial distance between the sixth lens element160and the seventh lens element170is T67, and the central thickness of the sixth lens element160is CT6, the following condition is satisfied: T67/CT6=0.57.

When an axial distance between the object-side surface111of the first lens element110and the image surface190is TL, the following condition is satisfied: TL=6.10 [mm].

When the axial distance between the object-side surface111of the first lens element110and the image surface190is TL, and the focal length of the optical imaging lens assembly is f, the following condition is satisfied: TL/f=1.03.

When the axial distance between the object-side surface111of the first lens element110and the image surface190is TL, and a maximum image height of the optical imaging lens assembly is ImgH, the following condition is satisfied: TL/ImgH=1.34.

When a 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: |R2/R1|=2.24.

When a curvature radius of the object-side surface141of the fourth lens element140is R7, and an axial distance between the object-side surface111of the first lens element110and the image-side surface172of the seventh lens element170is TD, the following condition is satisfied: |R7|/TD=34.99.

When a curvature radius of the object-side surface171of the seventh lens element170is R13, and a curvature radius of the image-side surface172of the seventh lens element170is R14, the following condition is satisfied: |R14/R13|=21.14.

When the focal length of the optical imaging lens assembly is f, and a focal length of the first lens element110is f1, the following condition is satisfied: |f/f1|=1.16.

When the focal length of the optical imaging lens assembly is f, and a focal length of the fourth lens element140is f4, the following condition is satisfied: f/f4=−0.21.

When the focal length of the optical imaging lens assembly is f, and a focal length of the fifth lens element150is f5, the following condition is satisfied: f/f5=0.15.

When the focal length of the optical imaging lens assembly is f, and a focal length of the sixth lens element160is f6, the following condition is satisfied: f/f6=−0.03.

When the focal length of the optical imaging lens assembly is f, the focal length of the fourth lens element140is f4, the focal length of the fifth lens element150is f5, and the focal length of the sixth lens element160is f6, the following condition is satisfied: |f/f4|+|f/f5|+|f/f6|=0.39.

When the maximum image height of the optical imaging lens assembly is ImgH, and an axial distance between the image-side surface172of the seventh lens element170and the image surface190is BL, the following condition is satisfied: ImgH/BL=5.85.

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 optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor295. The optical 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 stop201, a third lens element230, a fourth lens element240, a fifth lens element250, a sixth lens element260, a seventh lens element270, a filter280and an image surface290. The optical imaging lens assembly includes seven lens elements (210,220,230,240,250,260and270) with no additional lens element disposed between each of the adjacent seven 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 negative refractive power has an object-side surface221being convex in a paraxial region thereof and an image-side surface222being concave in a paraxial region thereof. The second lens element220is made of plastic material and has the object-side surface221and the image-side surface222being both aspheric. The object-side surface221of the second lens element220has two inflection points in an off-axis region thereof.

The third lens element230with positive refractive power has an object-side surface231being convex in a paraxial region thereof and an image-side surface232being convex 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 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. The object-side surface241of the fourth lens element240has one inflection point in an off-axis region thereof. The image-side surface242of the fourth lens element240has two inflection points 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 convex 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 object-side surface251of the fifth lens element250has two inflection points in an off-axis region thereof. The image-side surface252of the fifth lens element250has two inflection points 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 three inflection points in an off-axis region thereof. The image-side surface262of the sixth lens element260has two inflection points in an off-axis region thereof.

The seventh lens element270with negative refractive power has an object-side surface271being concave in a paraxial region thereof and an image-side surface272being concave in a paraxial region thereof. The seventh lens element270is made of plastic material and has the object-side surface271and the image-side surface272being both aspheric. The object-side surface271of the seventh lens element270has one inflection point in an off-axis region thereof. The image-side surface272of the seventh lens element270has two inflection points in an off-axis region thereof.

The filter280is made of glass material and located between the seventh lens element270and the image surface290, and will not affect the focal length of the optical imaging lens assembly. The image sensor295is disposed on or near the image surface290of the optical imaging lens assembly.

FIG. 5is a schematic view of an image capturing unit according to the 3rd embodiment of the present disclosure.FIG. 6shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 3rd embodiment. InFIG. 5, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor395. The optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop300, a first lens element310, a second lens element320, a stop301, a third lens element330, a fourth lens element340, a fifth lens element350, a sixth lens element360, a seventh lens element370, a filter380and an image surface390. The optical imaging lens assembly includes seven lens elements (310,320,330,340,350,360and370) with no additional lens element disposed between each of the adjacent seven 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 negative refractive power has an object-side surface321being concave in a paraxial region thereof and an image-side surface322being concave in a paraxial region thereof. The second lens element320is made of plastic material and has the object-side surface321and the image-side surface322being both aspheric. The object-side surface321of the second lens element320has one inflection point in an off-axis region thereof.

The third lens element330with positive refractive power has an object-side surface331being convex in a paraxial region thereof and an image-side surface332being convex 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 fourth lens element340with positive refractive power has an object-side surface341being convex in a paraxial region thereof and an image-side surface342being convex in a paraxial region thereof. The fourth lens element340is made of plastic material and has the object-side surface341and the image-side surface342being both aspheric. The object-side surface341of the fourth lens element340has one inflection point in an off-axis region thereof. The image-side surface342of the fourth lens element340has one inflection point in an off-axis region thereof.

The fifth lens element350has an object-side surface351being planar in a paraxial region thereof and an image-side surface352being planar 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 object-side surface351of the fifth lens element350has one inflection point in an off-axis region thereof. The image-side surface352of the fifth lens element350has one inflection point in an off-axis region thereof.

The sixth lens element360with negative refractive power has an object-side surface361being concave in a paraxial region thereof and an image-side surface362being concave in a paraxial region thereof. The sixth lens element360is made of plastic material and has the object-side surface361and the image-side surface362being both aspheric. The object-side surface361of the sixth lens element360has one inflection point in an off-axis region thereof. The image-side surface362of the sixth lens element360has two inflection points in an off-axis region thereof.

The seventh lens element370with negative refractive power has an object-side surface371being concave in a paraxial region thereof and an image-side surface372being planar in a paraxial region thereof. The seventh lens element370is made of plastic material and has the object-side surface371and the image-side surface372being both aspheric. The object-side surface371of the seventh lens element370has one inflection point in an off-axis region thereof. The image-side surface372of the seventh lens element370has one inflection point in an off-axis region thereof.

The filter380is made of glass material and located between the seventh lens element370and the image surface390, and will not affect the focal length of the optical imaging lens assembly. The image sensor395is disposed on or near the image surface390of the optical imaging lens assembly.

FIG. 7is a schematic view of an image capturing unit according to the 4th embodiment of the present disclosure.FIG. 8shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 4th embodiment. InFIG. 7, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor495. The optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop400, a first lens element410, a second lens element420, a stop401, a third lens element430, a fourth lens element440, a fifth lens element450, a sixth lens element460, a seventh lens element470, a filter480and an image surface490. The optical imaging lens assembly includes seven lens elements (410,420,430,440,450,460and470) with no additional lens element disposed between each of the adjacent seven lens elements.

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

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

The third lens element430with positive 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 image-side surface432of the third lens element430has one inflection point in an off-axis region thereof.

The fourth lens element440with negative refractive power has an object-side surface441being concave 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. The image-side surface442of the fourth lens element440has two inflection points in an off-axis region thereof.

The fifth lens element450with positive refractive power has an object-side surface451being convex 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 object-side surface451of the fifth lens element450has one inflection point in an off-axis region thereof. The image-side surface452of the fifth lens element450has one inflection point in an off-axis region thereof.

The sixth lens element460with positive refractive power has an object-side surface461being concave in a paraxial region thereof and an image-side surface462being convex in a paraxial region thereof. The sixth lens element460is made of plastic material and has the object-side surface461and the image-side surface462being both aspheric. The object-side surface461of the sixth lens element460has two inflection points in an off-axis region thereof. The image-side surface462of the sixth lens element460has two inflection points in an off-axis region thereof.

The seventh lens element470with negative refractive power has an object-side surface471being concave in a paraxial region thereof and an image-side surface472being convex in a paraxial region thereof. The seventh lens element470is made of plastic material and has the object-side surface471and the image-side surface472being both aspheric. The object-side surface471of the seventh lens element470has two inflection points in an off-axis region thereof.

The filter480is made of glass material and located between the seventh lens element470and the image surface490, and will not affect the focal length of the optical imaging lens assembly. The image sensor495is disposed on or near the image surface490of the optical imaging lens assembly.

FIG. 9is a schematic view of an image capturing unit according to the 5th embodiment of the present disclosure.FIG. 10shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 5th embodiment. InFIG. 9, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor595. The optical imaging lens assembly includes, in order from an object side to an image side, an aperture stop500, a first lens element510, a second lens element520, a stop501, a third lens element530, a fourth lens element540, a fifth lens element550, a sixth lens element560, a seventh lens element570, a filter580and an image surface590. The optical imaging lens assembly includes seven lens elements (510,520,530,540,550,560and570) with no additional lens element disposed between each of the adjacent seven lens elements.

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

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

The third lens element530with positive 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 image-side surface532of the third lens element530has one inflection point in an off-axis region thereof.

The fourth lens element540with negative 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. The object-side surface541of the fourth lens element540has one inflection point in an off-axis region thereof. The image-side surface542of the fourth lens element540has two inflection points in an off-axis region thereof.

The fifth lens element550with positive refractive power has an object-side surface551being convex 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 object-side surface551of the fifth lens element550has one inflection point in an off-axis region thereof. The image-side surface552of the fifth lens element550has one inflection point in an off-axis region thereof.

The sixth lens element560with positive refractive power has an object-side surface561being concave in a paraxial region thereof and an image-side surface562being convex in a paraxial region thereof. The sixth lens element560is made of plastic material and has the object-side surface561and the image-side surface562being both aspheric. The object-side surface561of the sixth lens element560has two inflection points in an off-axis region thereof. The image-side surface562of the sixth lens element560has two inflection points in an off-axis region thereof.

The seventh lens element570with negative refractive power has an object-side surface571being concave in a paraxial region thereof and an image-side surface572being convex in a paraxial region thereof. The seventh lens element570is made of plastic material and has the object-side surface571and the image-side surface572being both aspheric. The object-side surface571of the seventh lens element570has one inflection point in an off-axis region thereof. The image-side surface572of the seventh lens element570has one inflection point in an off-axis region thereof.

The filter580is made of glass material and located between the seventh lens element570and the image surface590, and will not affect the focal length of the optical imaging lens assembly. The image sensor595is disposed on or near the image surface590of the optical imaging lens assembly.

FIG. 11is a schematic view of an image capturing unit according to the 6th embodiment of the present disclosure.FIG. 12shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 6th embodiment. InFIG. 11, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor695. The optical 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 stop601, a third lens element630, a fourth lens element640, a fifth lens element650, a sixth lens element660, a seventh lens element670, a filter680and an image surface690. The optical imaging lens assembly includes seven lens elements (610,620,630,640,650,660and670) with no additional lens element disposed between each of the adjacent seven lens elements.

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

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

The third lens element630with positive refractive power has an object-side surface631being convex 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 image-side surface632of the third lens element630has one inflection point in an off-axis region thereof.

The fourth lens element640with negative refractive power has an object-side surface641being convex in a paraxial region thereof and an image-side surface642being concave 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 one inflection point in an off-axis region thereof. The image-side surface642of the fourth lens element640has two inflection points in an off-axis region thereof.

The fifth lens element650with positive refractive power has an object-side surface651being convex in a paraxial region thereof and an image-side surface652being convex in a paraxial region thereof. The fifth lens element650is made of plastic material and has the object-side surface651and the image-side surface652being both aspheric. The object-side surface651of the fifth lens element650has one inflection point in an off-axis region thereof.

The sixth lens element660with positive refractive power has an object-side surface661being concave in a paraxial region thereof and an image-side surface662being convex in a paraxial region thereof. The sixth lens element660is made of plastic material and has the object-side surface661and the image-side surface662being both aspheric. The object-side surface661of the sixth lens element660has two inflection points in an off-axis region thereof. The image-side surface662of the sixth lens element660has two inflection points in an off-axis region thereof.

The seventh lens element670with negative refractive power has an object-side surface671being concave in a paraxial region thereof and an image-side surface672being convex in a paraxial region thereof. The seventh lens element670is made of plastic material and has the object-side surface671and the image-side surface672being both aspheric. The object-side surface671of the seventh lens element670has one inflection point in an off-axis region thereof. The image-side surface672of the seventh lens element670has one inflection point in an off-axis region thereof.

The filter680is made of glass material and located between the seventh lens element670and the image surface690, and will not affect the focal length of the optical imaging lens assembly. The image sensor695is disposed on or near the image surface690of the optical imaging lens assembly.

FIG. 13is a schematic view of an image capturing unit according to the 7th embodiment of the present disclosure.FIG. 14shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 7th embodiment. InFIG. 13, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor795. The optical 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 stop701, a third lens element730, a fourth lens element740, a fifth lens element750, a sixth lens element760, a seventh lens element770, a filter780and an image surface790. The optical imaging lens assembly includes seven lens elements (710,720,730,740,750,760and770) with no additional lens element disposed between each of the adjacent seven 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 negative 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 third lens element730with positive 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 image-side surface732of the third lens element730has one inflection point in an off-axis region thereof.

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 object-side surface741of the fourth lens element740has one inflection point in an off-axis region thereof. The image-side surface742of the fourth lens element740has two inflection points in an off-axis region thereof.

The fifth lens element750with positive refractive power has an object-side surface751being convex in a paraxial region thereof and an image-side surface752being concave in a paraxial region thereof. The fifth lens element750is made of plastic material and has the object-side surface751and the image-side surface752being both aspheric. The object-side surface751of the fifth lens element750has one inflection point in an off-axis region thereof. The image-side surface752of the fifth lens element750has one inflection point in an off-axis region thereof.

The sixth lens element760with positive refractive power has an object-side surface761being concave 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 two inflection points in an off-axis region thereof. The image-side surface762of the sixth lens element760has two inflection points in an off-axis region thereof.

The seventh lens element770with negative refractive power has an object-side surface771being concave in a paraxial region thereof and an image-side surface772being concave in a paraxial region thereof. The seventh lens element770is made of plastic material and has the object-side surface771and the image-side surface772being both aspheric. The object-side surface771of the seventh lens element770has one inflection point in an off-axis region thereof. The image-side surface772of the seventh lens element770has two inflection points in an off-axis region thereof.

The filter780is made of glass material and located between the seventh lens element770and the image surface790, and will not affect the focal length of the optical imaging lens assembly. The image sensor795is disposed on or near the image surface790of the optical imaging lens assembly.

FIG. 15is a schematic view of an image capturing unit according to the 8th embodiment of the present disclosure.FIG. 16shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 8th embodiment. InFIG. 15, the image capturing unit includes the optical imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor895. The optical imaging lens assembly includes, in order from an object side to an image side, a stop801, a first lens element810, a second lens element820, an aperture stop800, a third lens element830, a fourth lens element840, a fifth lens element850, a sixth lens element860, a seventh lens element870, a filter880and an image surface890. The optical imaging lens assembly includes seven lens elements (810,820,830,840,850,860and870) with no additional lens element disposed between each of the adjacent seven 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 concave in a paraxial region thereof. The first lens element810is made of glass material and has the object-side surface811and the image-side surface812being both aspheric.

The second lens element820with negative refractive power has an object-side surface821being concave in a paraxial region thereof and an image-side surface822being concave in a paraxial region thereof. The second lens element820is made of plastic material and has the object-side surface821and the image-side surface822being both aspheric. The object-side surface821of the second lens element820has one inflection point in an off-axis region thereof.

The third lens element830with positive 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 image-side surface832of the third lens element830has one inflection point in an off-axis region thereof.

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. The image-side surface842of the fourth lens element840has one inflection point in an off-axis region thereof.

The fifth lens element850with negative refractive power has an object-side surface851being concave in a paraxial region thereof and an image-side surface852being concave in a paraxial region thereof. The fifth lens element850is made of plastic material and has the object-side surface851and the image-side surface852being both aspheric. The object-side surface851of the fifth lens element850has one inflection point in an off-axis region thereof. The image-side surface852of the fifth lens element850has one inflection point in an off-axis region thereof.

The sixth lens element860with positive refractive power has an object-side surface861being concave in a paraxial region thereof and an image-side surface862being convex in a paraxial region thereof. The sixth lens element860is made of plastic material and has the object-side surface861and the image-side surface862being both aspheric. The object-side surface861of the sixth lens element860has two inflection points in an off-axis region thereof. The image-side surface862of the sixth lens element860has two inflection points in an off-axis region thereof.

The seventh lens element870with negative refractive power has an object-side surface871being concave in a paraxial region thereof and an image-side surface872being concave in a paraxial region thereof. The seventh lens element870is made of plastic material and has the object-side surface871and the image-side surface872being both aspheric. The object-side surface871of the seventh lens element870has one inflection point in an off-axis region thereof. The image-side surface872of the seventh lens element870has two inflection points in an off-axis region thereof.

The filter880is made of glass material and located between the seventh lens element870and the image surface890, and will not affect the focal length of the optical imaging lens assembly. The image sensor895is disposed on or near the image surface890of the optical imaging lens assembly.

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

FIG. 17is a perspective view of an image capturing unit according to the 9th embodiment of the present disclosure. In this embodiment, an image capturing unit10is a camera module including a lens unit11, a driving device12, an image sensor13and an image stabilizer14. The lens unit11includes the optical imaging lens assembly disclosed in the 1st embodiment, a barrel and a holder member (their reference numerals are omitted) for holding the optical imaging lens assembly. The imaging light converges in the lens unit11of the image capturing unit10to generate an image with the driving device12utilized for image focusing 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 optical 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 (OIS). 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 image quality while in motion or low-light conditions.

FIG. 18is one perspective view of an electronic device according to the 10th embodiment of the present disclosure.FIG. 19is another perspective view of the electronic device inFIG. 18.FIG. 20is a block diagram of the electronic device inFIG. 18.

In this embodiment, an electronic device20is a smartphone including the image capturing unit10disclosed in the 9th embodiment, an image capturing unit10a, an image capturing unit10b, a flash module21, a focus assist module22, an image signal processor23, a user interface24and an image software processor25. The image capturing unit10, the image capturing unit10aand the image capturing unit10ball face the same direction, and each of the image capturing units10,10aand10bhas a single focal point. Furthermore, the image capturing unit10aand the image capturing unit10bboth have a configuration similar to that of the image capturing unit10. In detail, each of the image capturing unit10aand the image capturing unit10bincludes a lens unit, a driving device, an image sensor and an image stabilizer, and the lens unit includes a lens assembly, a barrel and a holder member for holding the lens assembly.

In this embodiment, the image capturing units10,10aand10bhave different fields of view (e.g., the image capturing unit10is a wide-angle image capturing unit, the image capturing unit10ais a telephoto image capturing unit and the image capturing unit10bis an ultra wide-angle image capturing unit), such that the electronic device20has various magnification ratios so as to meet the requirement of optical zoom functionality. In this embodiment, the electronic device20includes multiple image capturing units10,10aand10b, but the present disclosure is not limited to the number and arrangement of image capturing units.

When a user captures images of an object26, the light rays converge in the image capturing unit10, the image capturing unit10aor the image capturing unit10bto generate an image(s), 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 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 image processed by the image software processor25can be displayed on the user interface24.

The smartphone in this embodiment is only exemplary for showing the image capturing unit10of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The image capturing unit10can be optionally applied to optical systems with a movable focus. Furthermore, the optical imaging lens assembly of the image capturing unit10features 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.