Image capturing lens system, image capturing apparatus and electronic device

An image capturing lens system includes, in order from an object side to an image side, a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, a third lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, and a fourth lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number 105103311, filed Feb. 2, 2016, which is herein incorporated by reference.

BACKGROUND

Technical Field

The present disclosure relates to an image capturing lens system and an image capturing apparatus. More particularly, the present disclosure relates to a compact image capturing lens system and an image capturing apparatus applicable to electronic devices.

Description of Related Art

In recent years, with personal electronic products getting lighter and thinner, the size of the components inside the personal electronic products are also reduced, which leads to the popularity of compact image capturing lens systems. However, the conventional image capturing lens systems are hard to provide a larger field of view while maintaining a compact size. Accordingly, the conventional image capturing lens systems with a larger field of view are bulky, which are difficult to be employed in compact personal electronic products, such as mobile devices, portable video recorders and wearable apparatus.

SUMMARY

According to one aspect of the present disclosure, an image capturing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The third lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The fourth lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fourth lens element includes at least one convex shape in an off-axis region thereof. The image capturing lens system has a total of four lens elements. When a maximum of axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmax, a minimum of the axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmin, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, 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, and an axial distance between the third lens element and the fourth lens element is T34, the following conditions are satisfied:
1.0<ATmax/ATmin<8.0;
1.0<(R5+R6)/(R5−R6)<3.50; and
T34<T12<T23.

According to another aspect of the present disclosure, an image capturing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The third lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The fourth lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fourth lens element includes at least one convex shape in an off-axis region thereof. The image capturing lens system has a total of four lens elements. When a maximum of axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmax, a minimum of the axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmin, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and an f-number of the image capturing lens system is Fno, the following conditions are satisfied:
1.25<ATmax/ATmin<7.0;
(|f3|+|f4|)/(|f1|+|f2|)<0.65; and
1.50<Fno<2.60.

According to yet another aspect of the present disclosure, an image capturing apparatus includes the image capturing lens system according to the aforementioned aspect and an image sensor, wherein the image sensor is disposed on an image surface of the image capturing lens system.

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

According to yet further another aspect of the present disclosure, an image capturing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The third lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The fourth lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fourth lens element includes at least one convex shape in an off-axis region thereof. The image capturing lens system has a total of four lens elements. When a maximum of axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmax, a minimum of the axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmin, a ratio of a focal length of the image capturing lens system and a focal length of the first lens element is P1, a ratio of the focal length of the image capturing lens system and a focal length of the second lens element is P2, a ratio of the focal length of the image capturing lens system and a focal length of the third lens element is P3, a ratio of the focal length of the image capturing lens system and a focal length of the fourth lens element is P4, an axial distance between the second lens element and the third lens element is T23, and a central thickness of the second lens element is CT2, the following conditions are satisfied:
1.0<ATmax/ATmin;
1.50<(≡|P3|+|P4|)/(|P1|+|P2|)<9.0; and
0.80<T23/CT2<2.50.

DETAILED DESCRIPTION

An image capturing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element, wherein the image capturing lens system has a total of four lens elements.

The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. Therefore, the total track length of the image capturing lens system can be reduced, and the strength of the positive refractive power can be adjusted so as to obtain a larger field of view.

The second lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. Therefore, the chromatic aberration can be corrected, and the image capturing lens system can have a larger field of view.

The third lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. Therefore, the light-converging ability of the image capturing lens system is sufficient, which can lead to a more effective way of shortening the total track length while correcting the astigmatism of the image capturing lens system.

The fourth lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fourth lens element includes at least one convex shape in an off-axis region thereof. Therefore, the principal point of the image capturing lens system can be shifted toward the object side so as to shorten the back focal length thereof. Furthermore, the incident angle of the off-axis field onto an image sensor can be corrected, and the resolution of the peripheral image can be enhanced.

When a maximum of axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmax, and a minimum of the axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmin, the following condition is satisfied: 1.0<ATmax/ATmin. Therefore, the axial distances between every two lens elements of the image capturing lens system can be effectively controlled, which is favorable for assembling the image capturing lens system. Specifically, when 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, and an axial distance between the third lens element and the fourth lens element is T34, the maximum of T12, T23 and T34 is ATmax, and the minimum of T12, T23 and T34 is ATmin. Preferably, the following condition can be satisfied: 1.0<ATmax/ATmin<8.0. More preferably, the following condition can be satisfied: 1.25<ATmax/ATmin<7.0. Further preferably, the following condition can be satisfied: 1.25<ATmax/ATmin<5.0.

When a curvature radius of the object-side surface of the third lens element is R5, and a curvature radius of the image-side surface of the third lens element is R6, the following condition can be satisfied: 1.0<(R5+R6)/(R5−R6)<3.50. Therefore, the shape of the third lens element can be effectively controlled, which is favorable for molding the third lens element, and the failure molding and stress due to an excessive curvature of the third lens element can be prevented. Preferably, the following condition can be satisfied: 1.0<(R5+R6)/(R5−R6)<2.0.

When the axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, and the axial distance between the third lens element and the fourth lens element is T34, the following condition can be satisfied: T34<T12<T23. Therefore, the space between every two lens elements of the image capturing lens system can be balanced, which is favorable for assembling the image capturing lens system.

When the axial distance between the second lens element and the third lens element is T23, and a central thickness of the third lens element is CT3, the following condition can be satisfied: T23<CT3. Therefore, the thickness of the third lens element and the axial distance between the second lens element and the third lens element can be adjusted, which is favorable for the moldability and the homogeneity of the third lens element, and the assembling yield rate can be increased.

When a focal length of the first lens element is f1, and a focal length of the fourth lens element is f4, the following condition can be satisfied: |f4/f1|<0.85. Therefore, the distribution of the refractive power of the object side and the image side of the image capturing lens system can be balanced, so that the image capturing lens system can have a larger field of view.

When a focal length of the image capturing lens system is f, and a vertical distance between a maximum effective diameter on the image-side surface of the fourth lens element and an optical axis is Y42, the following condition can be satisfied: 1.0<fN42<1.40. Therefore, it can ensure that the image capturing lens system has a larger field of view while the total track length thereof being effectively controlled and the image height of the image capturing lens system being adequate.

When a half of a maximal field of view of the image capturing lens system is HFOV, the following condition can be satisfied: 0.78<tan(HFOV)<2.0. Therefore, the image capturing lens system can have a larger field of view, and the image capturing range can be widened.

When a maximum of refractive indexes of the first lens element, the second lens element, the third lens element and the fourth lens element is Nmax, the following condition can be satisfied: 1.65≦Nmax. Therefore, it is favorable for correcting aberrations of the image capturing lens system, and the image quality can be improved.

When the axial distance between the second lens element and the third lens element is T23, and a central thickness of the second lens element is CT2, the following condition can be satisfied: 0.80<T23/CT2<2.50. Therefore, it can ensure that there is enough space between the second lens element and the third lens element, which is favorable for assembling the image capturing lens system. Preferably, the following condition can be satisfied: 1.0<T23/CT2<2.0.

When the axial distance between the first lens element and the second lens element is T12, and the axial distance between the third lens element and the fourth lens element is T34, the following condition can be satisfied: 1.0<T12/T34<6.0. Therefore, the axial distance between every two lens elements can be properly adjusted, which is favorable for increasing the light receiving range of the image capturing lens system. Preferably, the following condition can be satisfied: 1.80<T12/T34<5.70.

When the focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the focal length of the fourth lens element is f4, the following conditions can be satisfied: |f3|<|f1|<|f2|; and |f4|<|f1|<|f2|. Therefore, the required refractive power of the image capturing lens system can be distributed by the third lens element and the fourth lens element, which can share the burden of the first lens element and the second lens element, so that a higher sensitivity of the lens elements in the front end (i.e., the lens elements near the object side) of the image capturing lens system can be reduced.

When the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, and the focal length of the fourth lens element is f4, the following condition can be satisfied: (|f3|+|f4|)/(|f1|+|f2|)<0.65. Therefore, the distribution of the refractive power of the lens elements of the image capturing lens system can be properly adjusted, so that the sensitivity of the image capturing lens system can be reduced.

When an f-number of the image capturing lens system is Fno, the following condition can be satisfied: 1.50<Fno<2.60. Therefore, the size of the aperture stop is proper, which can ensure that the light rays entering into the image capturing lens system are sufficient, and the image brightness can be maintained.

When an Abbe number of the fourth lens element is V4, the following condition can be satisfied: V4<30. Therefore, the chromatic aberration can be corrected, and the overlap of images can be prevented.

When the axial distance between the first lens element and the second lens element is T12, and the axial distance between the second lens element and the third lens element is T23, the following condition can be satisfied: 0.70<T12/T23<2.0. Therefore, the space distribution of the image capturing lens system can be effectively balanced, which is favorable for assembling the image capturing lens system.

When the focal length of the image capturing lens system is f, and the focal length of the second lens element is f2, the following condition can be satisfied: f2/f<−3.25. Therefore, the refractive power of the second lens element can be effectively adjusted, which is favorable for the image capturing lens system to receive the light rays of the larger field of view.

When a ratio of the focal length of the image capturing lens system and the focal length of the first lens element is P1 (i.e., P1=f/f1), a ratio of the focal length of the image capturing lens system and the focal length of the second lens element is P2 (i.e., P2=f/f2), a ratio of the focal length of the image capturing lens system and the focal length of the third lens element is P3 (i.e., P3=f/f3), and a ratio of the focal length of the image capturing lens system and the focal length of the fourth lens element is P4 (i.e., P4=f/f4), the following condition can be satisfied: 1.50<(|P3|+|P4|)/(|P1|+|P2|)<9.0. Therefore, the image capturing lens system is featured with wide angle, and has a larger photographing range.

When an axial distance between the object-side surface of the first lens element and an image surface is TL, and the vertical distance between a maximum effective diameter on the image-side surface of the fourth lens element and the optical axis is Y42, the following condition can be satisfied: TL/Y42<2.0. Therefore, a short total track length of the image capturing lens system can be maintained, and can ensure that the field of view of the image capturing lens system is sufficient.

According to the image capturing lens system of the present disclosure, the lens elements thereof can be made of a plastic or a glass material. When the lens elements are made of a plastic material, the manufacturing cost can be effectively reduced. When the lens elements are made of a glass material, the distribution of the refractive powers of the image capturing lens system may be more flexible to design. Furthermore, surfaces of each lens element can be arranged to be aspheric (ASP), 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 aberrations thereof, and to further decrease the required number of the lens elements. Therefore, the total track length of the image capturing lens system can also be reduced.

According to the image capturing lens system of 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, if not stated otherwise, 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. According to the image capturing lens system of the present disclosure, the positive refractive power or the negative refractive power of a lens element or the focal length of the lens element, that is, may refer to the refractive power or the focal length in the paraxial region of the lens element.

According to the image capturing lens system of the present disclosure, the image surface of the image capturing lens system, based on the corresponding image sensor, can be flat or curved. In particular, the image surface can be a curved surface being concave facing towards the object side.

According to the image capturing lens system of the present disclosure, the image capturing lens system 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 for eliminating the stray light and thereby improving the image resolution thereof.

According to the image capturing lens system of the present disclosure, an aperture stop can be configured as a front stop or a middle stop. The front stop disposed between an imaged object and the first lens element can provide a longer distance from an exit pupil of the image capturing lens system to the image surface and thereby improves the image-sensing efficiency of an image sensor. A middle stop disposed between the first lens element and the image surface is favorable for enlarging the field of view of the image capturing lens system and thereby provides a wider field of view for the same.

According to the image capturing lens system of the present disclosure, the image capturing lens system can be optionally applied to moving focus optical systems, and is featured with good ability for correcting aberrations and high image quality. The image capturing lens system of the present disclosure also can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart TV, surveillance devices, game consoles with motion sensing function, driving recording systems, rear view camera systems, and wearable devices.

According to the present disclosure, an image capturing apparatus is provided. The image capturing apparatus includes the aforementioned image capturing lens system and an image sensor, wherein the image sensor is disposed at the image side of the aforementioned image capturing lens system, that is, the image sensor can be disposed on or near the image surface of the aforementioned image capturing lens system. In the image capturing lens system, with the distribution of the refractive power and the surface shape of the first lens element, the second lens element, the third lens element and the fourth lens element, the image capturing apparatus has a compact size and a larger field of view at the same time. Preferably, the image capturing apparatus can further include a barrel member, a holding member or a combination thereof.

According to the present disclosure, an electronic device is provided. The electronic device includes the aforementioned image capturing apparatus. Therefore, the electronic device has a compact size and a larger field of view at the same time. Preferably, the electronic device can further include but not limited to a control unit, a display, a storage unit, a random access memory unit (RAM), a read only memory unit (ROM) or a combination thereof.

According to the above description of the present disclosure, the following 1st-14th specific embodiments are provided for further explanation.

FIG. 1is a schematic view of an image capturing apparatus according to the 1st embodiment of the present disclosure.FIG. 2shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 1st embodiment. InFIG. 1, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor170. The image capturing lens system 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, an IR-cut filter150and an image surface160, wherein the image sensor170is disposed on the image surface160of the image capturing lens system. The image capturing lens system has a total of four lens elements (110-140).

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 a 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 convex in a paraxial region thereof. The second lens element120is made of a plastic material, and has the object-side surface121and the image-side surface122being both aspheric.

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

The fourth lens element140with negative refractive power has an object-side surface141being convex in a paraxial region thereof and an image-side surface142being concave in a paraxial region thereof. The fourth lens element140is made of a plastic material, and has the object-side surface141and the image-side surface142being both aspheric. Furthermore, the image-side surface142of the fourth lens element140includes at least one convex shape in an off-axis region thereof.

The IR-cut filter150is made of a glass material and located between the fourth lens element140and the image surface160, and will not affect the focal length of the image capturing lens system.

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.

In the image capturing lens system according to the 1st embodiment, when a focal length of the image capturing lens system is f, an f-number of the image capturing lens system is Fno, and half of a maximal field of view of the image capturing lens system is HFOV, these parameters have the following values: f=2.59 mm; Fno=2.40; and HFOV=32.5 degrees.

In the image capturing lens system according to the 1st embodiment, when half of the maximal field of view of the image capturing lens system is HFOV, the following condition is satisfied: tan(HFOV)=0.64.

In the image capturing lens system according to the 1st embodiment, when an Abbe number of the fourth lens element140is V4, the following condition is satisfied: V4=56.0.

In the image capturing lens system according to the 1st embodiment, when a maximum of refractive indexes of the first lens element110, the second lens element120, the third lens element130and the fourth lens element140is Nmax, the following condition is satisfied: Nmax=1.660.

In the image capturing lens system according to the 1st embodiment, when 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, and an axial distance between the third lens element130and the fourth lens element140is T34, the following conditions are satisfied: T12/T23=0.86; and T12/T34=3.69.

In the image capturing lens system according to the 1st embodiment, when the axial distance between the second lens element120and the third lens element130is T23, and a central thickness of the second lens element120is CT2, the following condition is satisfied: T23/CT2=1.24.

In the image capturing lens system according to the 1st embodiment, when a maximum of the axial distances between every two lens elements of the first lens element110, the second lens element120, the third lens element130and the fourth lens element140which are adjacent to each other is ATmax, and a minimum of the axial distances between every two lens elements of the first lens element110, the second lens element120, the third lens element130and the fourth lens element140which are adjacent to each other is ATmin, the following condition is satisfied: ATmax/ATmin=4.32.

In the image capturing lens system according to the 1st embodiment, when a curvature radius of the object-side surface131of the third lens element130is R5, a curvature radius of the image-side surface132of the third lens element130is R6, the following condition is satisfied: (R5+R6)/(R5−R6)=1.25.

In the image capturing lens system according to the 1st embodiment, when a focal length of the first lens element110is f1, and a focal length of the fourth lens element140is f4, the following condition is satisfied: |f4/f1|=0.67.

In the image capturing lens system according to the 1st embodiment, when the focal length of the image capturing lens system is f, and a focal length of the second lens element120is f2, the following condition is satisfied: f2/f=−1.41.

FIG. 23shows a schematic view of a parameter Y42 of the fourth lens element140according to the 1st embodiment. When a vertical distance between a maximum effective diameter on the image-side surface142of the fourth lens element140and an optical axis is Y42, the focal length of the image capturing lens system is f, and an axial distance between the object-side surface111of the first lens element110and the image surface160is TL, the following conditions are satisfied: f/Y42=1.64; and TL/Y42=2.26.

In the image capturing lens system according to the 1st embodiment, when the focal length of the first lens element110is f1, the focal length of the second lens element120is f2, a focal length of the third lens element130is f3, and the focal length of the fourth lens element140is f4, the following condition is satisfied: (|f3|+|f4|)/(|f1|+|f2|)=0.51.

In the image capturing lens system according to the 1st embodiment, when a ratio of the focal length of the image capturing lens system and the focal length of the first lens element110is P1, a ratio of the focal length of the image capturing lens system and the focal length of the second lens element120is P2, is a ratio of the focal length of the image capturing lens system and the focal length of the third lens element130is P3, and a ratio of the focal length of the image capturing lens system and the focal length of the fourth lens element140is P4, the following condition is satisfied: (|P3|+|P4|)/(|P1|+|P2|)=1.91.

In the image capturing lens system according to the 1st embodiment, when the axial distance between the first lens element110and the second lens element120is T12, the axial distance between the second lens element120and the third lens element130is T23, and the axial distance between the third lens element130and the fourth lens element140is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 1st embodiment, when the axial distance between the second lens element120and the third lens element130is T23, and a central thickness of the third lens element130is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 1st embodiment, when the focal length of the first lens element110is f1, the focal length of the second lens element120is f2, the focal length of the third lens element130is f3, and the focal length of the fourth lens element140is f4, the following conditions are satisfied: 51 f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 3is a schematic view of an image capturing apparatus according to the 2nd embodiment of the present disclosure.FIG. 4shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 2nd embodiment. InFIG. 3, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor270. The image capturing lens system includes, in order from an object side to an image side, a first lens element210, an aperture stop200, a second lens element220, a third lens element230, a fourth lens element240, an IR-cut filter250and an image surface260, wherein the image sensor270is disposed on the image surface260of the image capturing lens system. The image capturing lens system has a total of four lens elements (210-240).

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 a plastic material, and has the object-side surface211and the image-side surface212being both aspheric.

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

The third lens element230with positive refractive power has an object-side surface231being concave in a paraxial region thereof and an image-side surface232being convex in a paraxial region thereof. The third lens element230is made of a 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 a plastic material, and has the object-side surface241and the image-side surface242being both aspheric. Furthermore, the image-side surface242of the fourth lens element240includes at least one convex shape in an off-axis region thereof.

The IR-cut filter250is made of a glass material and located between the fourth lens element240and the image surface260, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 2nd embodiment, when an axial distance between the first lens element210and the second lens element220is T12, an axial distance between the second lens element220and the third lens element230is T23, and an axial distance between the third lens element230and the fourth lens element240is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 2nd embodiment, when the axial distance between the second lens element220and the third lens element230is T23, and a central thickness of the third lens element230is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 2nd embodiment, when a focal length of the first lens element210is f1, a focal length of the second lens element220is f2, a focal length of the third lens element230is f3, and a focal length of the fourth lens element240is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 5is a schematic view of an image capturing apparatus according to the 3rd embodiment of the present disclosure.FIG. 6shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 3rd embodiment. InFIG. 5, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor370. The image capturing lens system 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, an IR-cut filter350and an image surface360, wherein the image sensor370is disposed on the image surface360of the image capturing lens system. The image capturing lens system has a total of four lens elements (310-340).

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 a 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 convex in a paraxial region thereof. The second lens element320is made of a plastic material, and has the object-side surface321and the image-side surface322being both aspheric.

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

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 a plastic material, and has the object-side surface341and the image-side surface342being both aspheric. Furthermore, the image-side surface342of the fourth lens element340includes at least one convex shape in an off-axis region thereof.

The IR-cut filter350is made of a glass material and located between the fourth lens element340and the image surface360, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 3rd embodiment, when an axial distance between the first lens element310and the second lens element320is T12, an axial distance between the second lens element320and the third lens element330is T23, and an axial distance between the third lens element330and the fourth lens element340is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 3rd embodiment, when the axial distance between the second lens element320and the third lens element330is T23, and a central thickness of the third lens element330is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 3rd embodiment, when a focal length of the first lens element310is f1, a focal length of the second lens element320is f2, a focal length of the third lens element330is f3, and a focal length of the fourth lens element340is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 7is a schematic view of an image capturing apparatus according to the 4th embodiment of the present disclosure.FIG. 8shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 4th embodiment. InFIG. 7, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor470. The image capturing lens system includes, in order from an object side to an image side, a first lens element410, an aperture stop400, a second lens element420, a third lens element430, a fourth lens element440, an IR-cut filter450and an image surface460, wherein the image sensor470is disposed on the image surface460of the image capturing lens system. The image capturing lens system has a total of four lens elements (410-440).

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 a 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 concave in a paraxial region thereof and an image-side surface422being convex in a paraxial region thereof. The second lens element420is made of a 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 concave in a paraxial region thereof and an image-side surface432being convex in a paraxial region thereof. The third lens element430is made of a 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 a plastic material, and has the object-side surface441and the image-side surface442being both aspheric. Furthermore, the image-side surface442of the fourth lens element440includes at least one convex shape in an off-axis region thereof.

The IR-cut filter450is made of a glass material and located between the fourth lens element440and the image surface460, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 4th embodiment, when an axial distance between the first lens element410and the second lens element420is T12, an axial distance between the second lens element420and the third lens element430is T23, and an axial distance between the third lens element430and the fourth lens element440is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 4th embodiment, when the axial distance between the second lens element420and the third lens element430is T23, and a central thickness of the third lens element430is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 4th embodiment, when a focal length of the first lens element410is f1, a focal length of the second lens element420is f2, a focal length of the third lens element430is f3, and a focal length of the fourth lens element440is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 9is a schematic view of an image capturing apparatus according to the 5th embodiment of the present disclosure.FIG. 10shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 5th embodiment. InFIG. 9, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor570. The image capturing lens system includes, in order from an object side to an image side, an aperture stop500, a first lens element510, a stop501, a second lens element520, a third lens element530, a fourth lens element540, an IR-cut filter550and an image surface560, wherein the image sensor570is disposed on the image surface560of the image capturing lens system. The image capturing lens system has a total of four lens elements (510-540).

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 a plastic material, and has the object-side surface511and the image-side surface512being both aspheric.

The second lens element520with negative refractive power has an object-side surface521being concave in a paraxial region thereof and an image-side surface522being convex in a paraxial region thereof. The second lens element520is made of a 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 concave in a paraxial region thereof and an image-side surface532being convex in a paraxial region thereof. The third lens element530is made of a plastic material, and has the object-side surface531and the image-side surface532being both aspheric.

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 a plastic material, and has the object-side surface541and the image-side surface542being both aspheric. Furthermore, the image-side surface542of the fourth lens element540includes at least one convex shape in an off-axis region thereof.

The IR-cut filter550is made of a glass material and located between the fourth lens element540and the image surface560, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 5th embodiment, when an axial distance between the first lens element510and the second lens element520is T12, an axial distance between the second lens element520and the third lens element530is T23, and an axial distance between the third lens element530and the fourth lens element540is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 5th embodiment, when the axial distance between the second lens element520and the third lens element530is T23, and a central thickness of the third lens element530is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 5th embodiment, when a focal length of the first lens element510is f1, a focal length of the second lens element520is f2, a focal length of the third lens element530is f3, and a focal length of the fourth lens element540is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 11is a schematic view of an image capturing apparatus according to the 6th embodiment of the present disclosure.FIG. 12shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 6th embodiment. InFIG. 11, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor670. The image capturing lens system includes, in order from an object side to an image side, an aperture stop600, a first lens element610, a stop601, a second lens element620, a third lens element630, a fourth lens element640, an IR-cut filter650and an image surface660, wherein the image sensor670is disposed on the image surface660of the image capturing lens system. The image capturing lens system has a total of four lens elements (610-640).

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 a 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 concave in a paraxial region thereof and an image-side surface622being convex in a paraxial region thereof. The second lens element620is made of a 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 concave in a paraxial region thereof and an image-side surface632being convex in a paraxial region thereof. The third lens element630is made of a plastic material, and has the object-side surface631and the image-side surface632being both aspheric.

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 a plastic material, and has the object-side surface641and the image-side surface642being both aspheric. Furthermore, the image-side surface642of the fourth lens element640includes at least one convex shape in an off-axis region thereof.

The IR-cut filter650is made of a glass material and located between the fourth lens element640and the image surface660, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 6th embodiment, when an axial distance between the first lens element610and the second lens element620is T12, an axial distance between the second lens element620and the third lens element630is T23, and an axial distance between the third lens element630and the fourth lens element640is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 6th embodiment, when the axial distance between the second lens element620and the third lens element630is T23, and a central thickness of the third lens element630is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 6th embodiment, when a focal length of the first lens element610is f1, a focal length of the second lens element620is f2, a focal length of the third lens element630is f3, and a focal length of the fourth lens element640is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 13is a schematic view of an image capturing apparatus according to the 7th embodiment of the present disclosure.FIG. 14shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 7th embodiment. InFIG. 13, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor770. The image capturing lens system includes, in order from an object side to an image side, a first lens element710, an aperture stop700, a second lens element720, a third lens element730, a fourth lens element740, an IR-cut filter750and an image surface760, wherein the image sensor770is disposed on the image surface760of the image capturing lens system. The image capturing lens system has a total of four lens elements (710-740).

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 a plastic material, and has the object-side surface711and the image-side surface712being both aspheric.

The second lens element720with negative refractive power has an object-side surface721being concave in a paraxial region thereof and an image-side surface722being convex in a paraxial region thereof. The second lens element720is made of a 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 concave in a paraxial region thereof and an image-side surface732being convex in a paraxial region thereof. The third lens element730is made of a plastic material, and has the object-side surface731and the image-side surface732being both aspheric.

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 a plastic material, and has the object-side surface741and the image-side surface742being both aspheric. Furthermore, the image-side surface742of the fourth lens element740includes at least one convex shape in an off-axis region thereof.

The IR-cut filter750is made of a glass material and located between the fourth lens element740and the image surface760, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 7th embodiment, when an axial distance between the first lens element710and the second lens element720is T12, an axial distance between the second lens element720and the third lens element730is T23, and an axial distance between the third lens element730and the fourth lens element740is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 7th embodiment, when the axial distance between the second lens element720and the third lens element730is T23, and a central thickness of the third lens element730is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 7th embodiment, when a focal length of the first lens element710is f1, a focal length of the second lens element720is f2, a focal length of the third lens element730is f3, and a focal length of the fourth lens element740is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 15is a schematic view of an image capturing apparatus according to the 8th embodiment of the present disclosure.FIG. 16shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 8th embodiment. InFIG. 15, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor870. The image capturing lens system includes, in order from an object side to an image side, a first lens element810, an aperture stop800, a second lens element820, a third lens element830, a fourth lens element840, an IR-cut filter850and an image surface860, wherein the image sensor870is disposed on the image surface860of the image capturing lens system. The image capturing lens system has a total of four lens elements (810-840).

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 a plastic material, and has the object-side surface811and the image-side surface812being both aspheric.

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

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

The fourth lens element840with negative refractive power has an object-side surface841being convex in a paraxial region thereof and an image-side surface842being concave in a paraxial region thereof. The fourth lens element840is made of a plastic material, and has the object-side surface841and the image-side surface842being both aspheric. Furthermore, the image-side surface842of the fourth lens element840includes at least one convex shape in an off-axis region thereof.

The IR-cut filter850is made of a glass material and located between the fourth lens element840and the image surface860, and will not affect the focal length of the image capturing lens system.

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

In the image capturing lens system according to the 8th embodiment, when an axial distance between the first lens element810and the second lens element820is T12, an axial distance between the second lens element820and the third lens element830is T23, and an axial distance between the third lens element830and the fourth lens element840is T34, the following condition is satisfied: T34<T12<T23.

In the image capturing lens system according to the 8th embodiment, when a focal length of the first lens element810is f1, a focal length of the second lens element820is f2, a focal length of the third lens element830is f3, and a focal length of the fourth lens element840is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 17is a schematic view of an image capturing apparatus according to the 9th embodiment of the present disclosure.FIG. 18shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 9th embodiment. InFIG. 17, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor970. The image capturing lens system includes, in order from an object side to an image side, a first lens element910, an aperture stop900, a second lens element920, a third lens element930, a fourth lens element940, an IR-cut filter950and an image surface960, wherein the image sensor970is disposed on the image surface960of the image capturing lens system. The image capturing lens system has a total of four lens elements (910-940).

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 a plastic material, and has the object-side surface911and the image-side surface912being both aspheric.

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

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

The fourth lens element940with negative refractive power has an object-side surface941being convex in a paraxial region thereof and an image-side surface942being concave in a paraxial region thereof. The fourth lens element940is made of a plastic material, and has the object-side surface941and the image-side surface942being both aspheric. Furthermore, the image-side surface942of the fourth lens element940includes at least one convex shape in an off-axis region thereof.

The IR-cut filter950is made of a glass material and located between the fourth lens element940and the image surface960, and will not affect the focal length of the image capturing lens system.

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:

In the image capturing lens system according to the 9th embodiment, when the axial distance between the second lens element920and the third lens element930is T23, and a central thickness of the third lens element930is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 9th embodiment, when a focal length of the first lens element910is f1, a focal length of the second lens element920is f2, a focal length of the third lens element930is f3, and a focal length of the fourth lens element940is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 19is a schematic view of an image capturing apparatus according to the 10th embodiment of the present disclosure.FIG. 20shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 10th embodiment. InFIG. 19, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor1070. The image capturing lens system includes, in order from an object side to an image side, an aperture stop1000, a first lens element1010, a second lens element1020, a third lens element1030, a fourth lens element1040, an IR-cut filter1050and an image surface1060, wherein the image sensor1070is disposed on the image surface1060of the image capturing lens system. The image capturing lens system has a total of four lens elements (1010-1040).

The first lens element1010with positive 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 a plastic material, and has the object-side surface1011and the image-side surface1012being both aspheric.

The second lens element1020with negative refractive power has an object-side surface1021being concave in a paraxial region thereof and an image-side surface1022being convex in a paraxial region thereof. The second lens element1020is made of a plastic material, and has the object-side surface1021and the image-side surface1022being both aspheric.

The third lens element1030with positive refractive power has an object-side surface1031being concave in a paraxial region thereof and an image-side surface1032being convex in a paraxial region thereof. The third lens element1030is made of a plastic material, and has the object-side surface1031and the image-side surface1032being both aspheric.

The fourth lens element1040with negative refractive power has an object-side surface1041being convex in a paraxial region thereof and an image-side surface1042being concave in a paraxial region thereof. The fourth lens element1040is made of a plastic material, and has the object-side surface1041and the image-side surface1042being both aspheric. Furthermore, the image-side surface1042of the fourth lens element1040includes at least one convex shape in an off-axis region thereof.

The IR-cut filter1050is made of a glass material and located between the fourth lens element1040and the image surface1060, and will not affect the focal length of the image capturing lens system.

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:

In the image capturing lens system according to the 10th embodiment, when the axial distance between the second lens element1020and the third lens element1030is T23, and a central thickness of the third lens element1030is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 10th embodiment, when a focal length of the first lens element1010is f1, a focal length of the second lens element1020is f2, a focal length of the third lens element1030is f3, and a focal length of the fourth lens element1040is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 21is a schematic view of an image capturing apparatus according to the 11th embodiment of the present disclosure.FIG. 22shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing apparatus according to the 11th embodiment. InFIG. 21, the image capturing apparatus includes an image capturing lens system (its reference numeral is omitted) and an image sensor1170. The image capturing lens system includes, in order from an object side to an image side, an aperture stop1100, a first lens element1110, a second lens element1120, a third lens element1130, a fourth lens element1140, an IR-cut filter1150and an image surface1160, wherein the image sensor1170is disposed on the image surface1160of the image capturing lens system. The image capturing lens system has a total of four lens elements (1110-1140).

The first lens element1110with positive refractive power has an object-side surface1111being convex in a paraxial region thereof and an image-side surface1112being concave in a paraxial region thereof. The first lens element1110is made of a plastic material, and has the object-side surface1111and the image-side surface1112being both aspheric.

The second lens element1120with negative refractive power has an object-side surface1121being concave in a paraxial region thereof and an image-side surface1122being convex in a paraxial region thereof. The second lens element1120is made of a plastic material, and has the object-side surface1121and the image-side surface1122being both aspheric.

The third lens element1130with positive refractive power has an object-side surface1131being concave in a paraxial region thereof and an image-side surface1132being convex in a paraxial region thereof. The third lens element1130is made of a plastic material, and has the object-side surface1131and the image-side surface1132being both aspheric.

The fourth lens element1140with negative refractive power has an object-side surface1141being convex in a paraxial region thereof and an image-side surface1142being concave in a paraxial region thereof. The fourth lens element1140is made of a plastic material, and has the object-side surface1141and the image-side surface1142being both aspheric. Furthermore, the image-side surface1142of the fourth lens element1140includes at least one convex shape in an off-axis region thereof.

The IR-cut filter1150is made of a glass material and located between the fourth lens element1140and the image surface1160, and will not affect the focal length of the image capturing lens system.

The detailed optical data of the 11th embodiment are shown in Table 21 and the aspheric surface data are shown in Table 22 below.

Moreover, these parameters can be calculated from Table 21 and Table 22 as the following values and satisfy the following conditions:

In the image capturing lens system according to the 11th embodiment, when the axial distance between the second lens element1120and the third lens element1130is T23, and a central thickness of the third lens element1130is CT3, the following condition is satisfied: T23<CT3.

In the image capturing lens system according to the 11th embodiment, when a focal length of the first lens element1110is f1, a focal length of the second lens element1120is f2, a focal length of the third lens element1130is f3, and a focal length of the fourth lens element1140is f4, the following conditions are satisfied: |f3|<|f1|<|f2|, and |f4|<|f1|<|f2|.

FIG. 24is a schematic view of an electronic device10according to the 12th embodiment of the present disclosure. The electronic device10of the 12th embodiment is a smart phone, wherein the electronic device10includes an image capturing apparatus11. The image capturing apparatus11includes an image capturing lens system (not shown herein) according to the present disclosure and an image sensor (not shown herein), wherein the image sensor is disposed on an image surface of the image capturing lens system.

FIG. 25is a schematic view of an electronic device20according to the 13th embodiment of the present disclosure. The electronic device20of the 13th embodiment is a tablet personal computer, wherein the electronic device20includes an image capturing apparatus21. The image capturing apparatus21includes an image capturing lens system (not shown herein) according to the present disclosure and an image sensor (not shown herein), wherein the image sensor is disposed on an image surface of the image capturing lens system.

FIG. 26is a schematic view of an electronic device30according to the 14th embodiment of the present disclosure. The electronic device30of the 14th embodiment is a head-mounted display (HMD), wherein the electronic device30includes an image capturing apparatus31. The image capturing apparatus31includes an image capturing lens system (not shown herein) according to the present disclosure and an image sensor (not shown herein), wherein the image sensor is disposed on an image surface of the image capturing lens system.