Image capturing lens system

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, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element with positive refractive power has a convex object-side surface. The third lens element has negative refractive power. The fourth lens element with positive refractive power has a convex image-side surface. The fifth lens element with negative refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface of the fifth lens element. The image capturing lens system has a total of five lens elements with refractive power.

RELATED APPLICATIONS

The application claims priority to Taiwan Application Serial Number 102113027, filed on Apr. 12, 2013, which is herein incorporated by reference.

BACKGROUND

1. Technical Field

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

2. Description of Related Art

In recent years, with the popularity of mobile products having camera functionalities, the demand of miniaturized optical systems has been increasing. The sensor of a conventional photographing camera is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) sensor. As the advanced semiconductor manufacturing technologies have allowed the pixel size of sensors to be reduced and compact optical systems have gradually evolved toward the field of higher megapixels, there is an increasing demand for compact optical systems featuring better image quality.

A conventional compact optical system employed in a portable electronic product mainly adopts a structure of four-element lens such as the one disclosed in the U.S. Pat. No. 8,169,528. Due to the popularity of mobile products with high-end specifications, such as smart phones and PDAs (Personal Digital Assistants), the requirements for high resolution and image quality of modern compact optical systems have been increasing significantly. However, the conventional four-element lens structure cannot satisfy these requirements of the compact optical system.

Although other conventional optical systems with five-element lens structure such as the one disclosed in the U.S. Pat. No. 8,189,273 enhances image quality; however, the refractive power of this optical system is not proper distributed for every lens element. It thereby results into more aberration and is more sensitive to the variations of manufacturing processes. Given that the requirements for higher megapixels and better image quality have been increasing, the manufacturing yield rate of this optical system might be low.

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, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element with positive refractive power has a convex object-side surface. The third lens element has negative refractive power. The fourth lens element with positive refractive power has a convex image-side surface. The fifth lens element with negative refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface of the fifth lens element. The image capturing lens system has a total of five lens elements with refractive power. When an axial distance between the second lens element and the third lens element is T23, a central thickness of the second lens element is CT2, a focal length of the second lens element is f2, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the object-side surface of the fifth lens element is R9, and a curvature radius of the image-side surface of the fifth lens element is R10, the following relationships are satisfied:
0.75<T23/CT2<3.0;
2.0<f2/R3<15.0; and
0<(R9+R10)/(R9−R10).

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, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element with positive refractive power has a convex object-side surface. The third lens element has negative refractive power. The fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface. The fifth lens element with negative refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface of the fifth lens element. The image capturing lens system has a total of five lens elements with refractive power. When an axial distance between the second lens element and the third lens element is T23, a central thickness of the second lens element is CT2, a focal length of the second lens element is f2, and a curvature radius of the object-side surface of the second lens element is R3, the following relationships are satisfied:
0.75<T23/CT2<3.0;
2.0<f2/R3.

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, a fourth lens element and a fifth lens element. The image capturing lens system has a total of five lens elements with refractive power.

The first lens element has positive refractive power, so that it provides the image capturing lens system with the positive refractive power as it needs to be which is favorable for reducing the total track length of the image capturing lens system. The first lens element can have a convex object-side surface and a concave image-side surface, so that it is favorable for adjusting the total track length. At least one inflection point is formed on the image-side surface of the first lens element which is favorable for effectively correcting the aberration of the off-axis.

The second lens element with positive refractive power can avoid overloading the positive refractive power on one single lens element, so that it is favorable for effectively reducing spherical aberration and sensitivity so as to increase yield rate. The second lens element has a convex object-side surface and can have a concave image-side surface which is favorable for correcting astigmatism.

The third lens element with negative refractive power can correct the aberration generated from the first lens element and the second lens element. The third lens element can have a concave object-side surface, so that it is favorable for further correcting the aberration.

The fourth lens element has positive refractive power, so that it is favorable for reducing the spherical aberration. The fourth lens element can have a concave object-side surface and has a convex image-side surface, so that the astigmatism of the image capturing lens system can be further corrected.

The fifth lens element has negative refractive power, so that it is favorable for effectively correcting the Petzval sum to make the image plane more flat. The fifth lens element can have a convex object-side surface and has a concave image-side surface, so that the principal point can be positioned away from the image plane. It is favorable for reducing the back focal length so as to keep the image capturing lens system a compact size. At least one inflection point is formed on at least one of the object-side surface and the image-side surface, so that the incident angle of the off-axis on the image plane can be reduced for increasing the responding rate of an image sensor so as to further correct the aberration of the off-axis.

When 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 relationship is satisfied: 0.75<T23/CT2<3.0. Therefore, it is favorable for assembling the lens elements and improving the moldability during the injection molding process. Preferably, the following relationship is satisfied: 0.75<T23/CT2<1.5.

When a focal length of the second lens element is f2, and a curvature radius of the object-side surface of the second lens element is R3, the following relationship is satisfied: 2.0<f2/R3. Therefore, it is favorable for reducing the system sensitivity so as to increase the manufacturing yield rate. Preferably, the following relationship is satisfied: 2.0<f2/R3<15.0. More preferably, the following relationship is satisfied: 2.0<f2/R3<5.0.

When a curvature radius of the object-side surface of the fifth lens element is R9, and a curvature radius of the image-side surface of the fifth lens element is R10, the following relationship is satisfied: 0<(R9+R10)/(R9−R10). Therefore, it is favorable for reducing the astigmatism of the image capturing lens system. Preferably, the following relationship is satisfied: 0.8<(R9+R10)/(R9−R10)<5.0.

When an Abbe number of the second lens element is V2, and an Abbe number of the third lens element is V3, the following relationship is satisfied: 1.5<V2/V3<3.0. Therefore, the chromatic aberration of the image capturing lens system can be corrected.

When a focal length of the first lens element is f1, the focal length of the second lens element is f2, a focal length of the third lens element is f3, and a focal length of the fourth lens element is f4, the following relationship is satisfied: 0.75<(f4/f1)+(f4/f2)+|f4/f3|<1.5. Therefore, it provides every lens element of the image capturing lens system with the evenly distributed refractive power as it needs to be. It is favorable for reducing the sensitivity of the image capturing lens system to the manufacturing variations resulted from the curvature radius or central thickness of the lens elements so as to effectively increase the manufacturing yield rate.

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 relationship is satisfied: −2.5<(R5+R6)/(R5−R6)<0.5. Therefore, it is favorable for reducing the aberration.

When the focal length of the first lens element is f1, and the focal length of the second lens element is f2, the following relationship is satisfied: 0<f2/f1<0.90. Therefore, it is favorable for balancing the distribution of refractive power for the first lens element and the second lens element. It is thereby favorable for correcting the spherical aberration of the image capturing lens system so as to improve its resolving power.

When a focal length of the image capturing lens system is f, and a composite focal length of the second lens element and the third lens element is f23, the following relationship is satisfied: 0<f/f23<0.5. Therefore, it is favorable for reducing the aberration.

When the focal length of the third lens element is f3, and the focal length of the second lens element is f2, the following relationship is satisfied: −1.50<f3/f2<−0.70. Therefore, it is favorable for reducing the spherical aberration and the astigmatism.

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 relationship is satisfied: 0.5<f/f2<1.0. Therefore, it is favorable for reducing the manufacturing sensitivity.

According to the image capturing lens system of the present disclosure, the lens elements thereof can be made of glass or plastic material. When the lens elements are made of glass material, the distribution of the refractive power of the image capturing lens system may be more flexible to design. When the lens elements are made of plastic material, the manufacturing cost can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be aspheric, because the aspheric surface of the lens element is easy to form a shape other than spherical surface so as to have more controllable variables for eliminating the aberration thereof, and to further decrease the required number of the lens elements. Therefore, the total track length of the 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 of every lens element has a paraxial region thereof and a peripheral region thereof. The paraxial region thereof refers to the region of the surface where light rays travel close to an optical axis and the peripheral region thereof refers to the region of the surface where light rays travel away from the optical axis. Particularly, when the lens element has a convex surface, it indicates that the surface is convex at the paraxial region thereof; and when the lens element has a concave surface, it indicates that the surface is concave at the paraxial region thereof.

According to the image capturing lens system of the present disclosure, the optical image lens system can include at least one stop, such as an aperture stop, a glare stop, or a field stop, etc.

According to the image capturing lens system of the present disclosure, the image capturing lens system is featured with good correction ability and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices and tablets.

According to the above description of the present disclosure, the following 1st-7th specific embodiments are provided for further explanation.

FIG. 1Ais a schematic view of an image capturing lens system according to the 1st embodiment of the present disclosure.FIG. 1Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 1st embodiment. InFIG. 1A, 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, a fifth lens element150, an IR-cut filter160and an image plane170. The image capturing lens system has a total of five lens elements (110-150) with refractive power.

The first lens element110with positive refractive power has a convex object-side surface111and a concave image-side surface112, and is made of plastic material. The object-side surface111and the image-side surface112of the first lens element110are aspheric. Furthermore, the image-side surface112of the first lens element110has at least one inflection point.

The second lens element120with positive refractive power has a convex object-side surface121and a concave image-side surface122, and is made of plastic material. The object-side surface121and the image-side surface122of the second lens element120are aspheric.

The third lens element130with negative refractive power has a concave object-side surface131and a convex image-side surface132, and is made of plastic material. The object-side surface131and the image-side surface132of the third lens element130are aspheric.

The fourth lens element140with positive refractive power has a concave object-side surface141and a convex image-side surface142, and is made of plastic material. The object-side surface141and the image-side surface142of the fourth lens element140are aspheric.

The fifth lens element150with negative refractive power has a convex object-side surface151and a concave image-side surface152, and is made of plastic material. The object-side surface151and the image-side surface152of the fifth lens element150are aspheric. Furthermore, both of the object-side surface151and the image-side surface152of the fifth lens element150have at least one inflection point.

The IR-cut filter160is made of glass and located between the fifth lens element150and the image plane170, 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 the optical axis and the tangential plane at the aspheric surface vertex on the optical axis;

Y is the distance from the point on the curve of 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, 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 the maximal field of view of the image capturing lens system is HFOV; these parameters have the following values: f=2.91 mm; Fno=2.08; and HFOV=37.5 degrees.

In the image capturing lens system according to the 1st embodiment, an Abbe number of the second lens element120is V2, and an Abbe number of the third lens element130is V3; the following relationship is satisfied: V2/V3=2.40.

In the image capturing lens system according to the 1st embodiment, an axial distance between the second lens element120and the third lens element130is T23, and a central thickness of the second lens element120is CT2; the following relationship is satisfied: T23/CT2=1.21.

In the image capturing lens system according to the 1st embodiment, a curvature radius of the object-side surface131of the third lens element130is R5, and a curvature radius of the image-side surface132of the third lens element130is R6; the following relationship is satisfied: (R5+R6)/(R5−R6)=−1.66.

In the image capturing lens system according to the 1st embodiment, a curvature radius of the object-side surface151of the fifth lens element150is R9, and a curvature radius of the image-side surface152of the fifth lens element150is R10; the following relationship is satisfied: (R9+R10)/(R9−R10)=2.36.

In the image capturing lens system according to the 1st embodiment, a focal length of the first lens element110is f1, and a focal length of the second lens element120is f2; the following relationship is satisfied: f2/f1=0.65.

In the image capturing lens system according to the 1st embodiment, a focal length of the second lens element120is f2, and a curvature radius of the object-side surface121of the second lens element120is R3; the following relationship is satisfied: f2/R3=2.46.

In the image capturing lens system according to the 1st embodiment, a focal length of the image capturing lens system is f, and a focal length of the second lens element120is f2; the following relationship is satisfied: f/f2=0.58.

In the image capturing lens system according to the 1st embodiment, a focal length of the image capturing lens system is f, and a composite focal length of the second lens element120and the third lens element130is f23; the following relationship is satisfied: f/f23=0.13.

In the image capturing lens system according to the 1st embodiment, a focal length of the third lens element130is f3, and a focal length of the second lens element120is f2; the following relationship is satisfied: f3/f2=−1.12.

In the image capturing lens system according to the 1st embodiment, a focal length of the first lens element110is f1, a focal length of the second lens element120is f2, a focal length of the third lens element130is f3, and a focal length of the fourth lens element140is f4; the following relationship is satisfied: (f4/f1)+(f4/f2)+|f4+f3|=0.94.

In Table 1, the curvature radius, the thickness and the focal length are shown in millimeters (mm). Surface numbers 0-14 represent the surfaces sequentially arranged from the object-side to the image-side along the optical axis. In Table 2, k represents the conic coefficient of the equation of the aspheric surface profiles. A1-A16 represent the aspheric coefficients ranging from the 1st order to the 16th order. This information related to Table 1 and Table 2 applies also to the Tables for the remaining embodiments, and so an explanation in this regard will not be provided again.

FIG. 2Ais a schematic view of an image capturing lens system according to the 2nd embodiment of the present disclosure.FIG. 2Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 2nd embodiment. InFIG. 2A, the image capturing lens system includes, in order from an object side to an image side, an aperture stop200, a first lens element210, a second lens element220, a third lens element230, a fourth lens element240, a fifth lens element250, an IR-cut filter260and an image plane270. The image capturing lens system has a total of five lens elements (210-250) with refractive power.

The first lens element210with positive refractive power has a convex object-side surface211and a concave image-side surface212, and is made of plastic material. The object-side surface211and the image-side surface212of the first lens element210are aspheric. Furthermore, the image-side surface212of the first lens element210has at least one inflection point.

The second lens element220with positive refractive power has a convex object-side surface221and a concave image-side surface222, and is made of plastic material. The object-side surface221and the image-side surface222of the second lens element220are aspheric.

The third lens element230with negative refractive power has a concave object-side surface231and a convex image-side surface232, and is made of plastic material. The object-side surface231and the image-side surface232of the third lens element230are aspheric.

The fourth lens element240with positive refractive power has a concave object-side surface241and a convex image-side surface242, and is made of plastic material. The object-side surface241and the image-side surface242of the fourth lens element240are aspheric.

The fifth lens element250with negative refractive power has a convex object-side surface251and a concave image-side surface252, and is made of plastic material. The object-side surface251and the image-side surface252of the fifth lens element250are aspheric. Furthermore, both of the object-side surface251and the image-side surface252of the fifth lens element250have at least one inflection point.

The IR-cut filter260is made of glass and located between the fifth lens element250and the image plane270, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 2nd embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 2nd embodiment. Moreover, these parameters can be calculated from Table 3 and Table 4 as the following values and satisfy the following relationships:

FIG. 3Ais a schematic view of an image capturing lens system according to the 3rd embodiment of the present disclosure.FIG. 3Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 3rd embodiment. InFIG. 3A, the image capturing lens system includes, in order from an object side to an image side, an aperture stop300, a first lens element310, a second lens element320, a third lens element330, a fourth lens element340, a fifth lens element350, an IR-cut filter360and an image plane370. The image capturing lens system has a total of five lens elements (310-350) with refractive power.

The first lens element310with positive refractive power has a convex object-side surface311and a concave image-side surface312, and is made of plastic material. The object-side surface311and the image-side surface312of the first lens element310are aspheric. Furthermore, the image-side surface312of the first lens element310has at least one inflection point.

The second lens element320with positive refractive power has a convex object-side surface321and a concave image-side surface322, and is made of plastic material. The object-side surface321and the image-side surface322of the second lens element320are aspheric.

The third lens element330with negative refractive power has a concave object-side surface331and a concave image-side surface332, and is made of plastic material. The object-side surface331and the image-side surface332of the third lens element330are aspheric.

The fourth lens element340with positive refractive power has a concave object-side surface341and a convex image-side surface342, and is made of plastic material. The object-side surface341and the image-side surface342of the fourth lens element340are aspheric.

The fifth lens element350with negative refractive power has a convex object-side surface351and a concave image-side surface352, and is made of plastic material. The object-side surface351and the image-side surface352of the fifth lens element350are aspheric. Furthermore, both of the object-side surface351and the image-side surface352of the fifth lens element350have at least one inflection point.

The IR-cut filter360is made of glass and located between the fifth lens element350and the image plane370, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 3rd embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 3rd embodiment. Moreover, these parameters can be calculated from Table 5 and Table 6 as the following values and satisfy the following relationships:

FIG. 4Ais a schematic view of an image capturing lens system according to the 4th embodiment of the present disclosure.FIG. 4Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 4th embodiment. InFIG. 4A, the image capturing lens system includes, in order from an object side to an image side, an aperture stop400, a first lens element410, a second lens element420, a third lens element430, a fourth lens element440, a fifth lens element450, an IR-cut filter460and an image plane470. The image capturing lens system has a total of five lens elements (410-450) with refractive power.

The first lens element410with positive refractive power has a convex object-side surface411and a concave image-side surface412, and is made of plastic material. The object-side surface411and the image-side surface412of the first lens element410are aspheric. Furthermore, the image-side surface412of the first lens element410has at least one inflection point.

The second lens element420with positive refractive power has a convex object-side surface421and a concave image-side surface422, and is made of plastic material. The object-side surface421and the image-side surface422of the second lens element420are aspheric.

The third lens element430with negative refractive power has a concave object-side surface431and a concave image-side surface432, and is made of plastic material. The object-side surface431and the image-side surface432of the third lens element430are aspheric.

The fourth lens element440with positive refractive power has a convex object-side surface441and a convex image-side surface442, and is made of plastic material. The object-side surface441and the image-side surface442of the fourth lens element440are aspheric.

The fifth lens element450with negative refractive power has a convex object-side surface451and a concave image-side surface452, and is made of plastic material. The object-side surface451and the image-side surface452of the fifth lens element450are aspheric. Furthermore, both of the object-side surface451and the image-side surface452of the fifth lens element450have at least one inflection point.

The IR-cut filter460is made of glass and located between the fifth lens element450and the image plane470, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 4th embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 4th embodiment. Moreover, these parameters can be calculated from Table 7 and Table 8 as the following values and satisfy the following relationships:

FIG. 5Ais a schematic view of an image capturing lens system according to the 5th embodiment of the present disclosure.FIG. 5Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 5th embodiment. InFIG. 5A, the image capturing lens system includes, in order from an object side to an image side, an aperture stop500, a first lens element510, a second lens element520, a third lens element530, a fourth lens element540, a fifth lens element550, an IR-cut filter560and an image plane570. The image capturing lens system has a total of five lens elements (510-550) with refractive power.

The first lens element510with positive refractive power has a convex object-side surface511and a concave image-side surface512, and is made of plastic material. The object-side surface511and the image-side surface512of the first lens element510are aspheric. Furthermore, the image-side surface512of the first lens element510has at least one inflection point.

The second lens element520with positive refractive power has a convex object-side surface521and a convex image-side surface522, and is made of glass material. The object-side surface521and the image-side surface522of the second lens element520are aspheric.

The third lens element530with negative refractive power has a concave object-side surface531and a concave image-side surface532, and is made of plastic material. The object-side surface531and the image-side surface532of the third lens element530are aspheric.

The fourth lens element540with positive refractive power has a concave object-side surface541and a convex image-side surface542, and is made of plastic material. The object-side surface541and the image-side surface542of the fourth lens element540are aspheric.

The fifth lens element550with negative refractive power has a convex object-side surface551and a concave image-side surface552, and is made of plastic material. The object-side surface551and the image-side surface552of the fifth lens element550are aspheric. Furthermore, both of the object-side surface551and the image-side surface552of the fifth lens element550have at least one inflection point.

The IR-cut filter560is made of glass and located between the fifth lens element550and the image plane570, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 5th embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 5th embodiment. Moreover, these parameters can be calculated from Table 9 and Table 10 as the following values and satisfy the following relationships:

FIG. 6Ais a schematic view of an image capturing lens system according to the 6th embodiment of the present disclosure.FIG. 6Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 6th embodiment. InFIG. 6A, the image capturing lens system includes, in order from an object side to an image side, an aperture stop600, a first lens element610, a second lens element620, a third lens element630, a fourth lens element640, a fifth lens element650, an IR-cut filter660and an image plane670. The image capturing lens system has a total of five lens elements (610-650) with refractive power.

The first lens element610with positive refractive power has a convex object-side surface611and a concave image-side surface612, and is made of plastic material. The object-side surface611and the image-side surface612of the first lens element610are aspheric. Furthermore, the image-side surface612of the first lens element610has at least one inflection point.

The second lens element620with positive refractive power has a convex object-side surface621and a concave image-side surface622, and is made of plastic material. The object-side surface621and the image-side surface622of the second lens element620are aspheric.

The third lens element630with negative refractive power has a concave object-side surface631and a concave image-side surface632, and is made of plastic material. The object-side surface631and the image-side surface632of the third lens element630are aspheric.

The fourth lens element640with positive refractive power has a concave object-side surface641and a convex image-side surface642, and is made of plastic material. The object-side surface641and the image-side surface642of the fourth lens element640are aspheric.

The fifth lens element650with negative refractive power has a convex object-side surface651and a concave image-side surface652, and is made of plastic material. The object-side surface651and the image-side surface652of the fifth lens element650are aspheric. Furthermore, both of the object-side surface651and the image-side surface652of the fifth lens element650have at least one inflection point.

The IR-cut filter660is made of glass and located between the fifth lens element650and the image plane670, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 6th embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 6th embodiment. Moreover, these parameters can be calculated from Table 11 and Table 12 as the following values and satisfy the following relationships:

FIG. 7Ais a schematic view of an image capturing lens system according to the 7th embodiment of the present disclosure.FIG. 7Bshows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing lens system according to the 7th embodiment. InFIG. 7A, 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, a fifth lens element750, an IR-cut filter760and an image plane770. The image capturing lens system has a total of five lens elements (710-750) with refractive power.

The first lens element710with positive refractive power has a convex object-side surface711and a concave image-side surface712, and is made of plastic material. The object-side surface711and the image-side surface712of the first lens element710are aspheric. Furthermore, the image-side surface712of the first lens element710has at least one inflection point.

The second lens element720with positive refractive power has a convex object-side surface721and a concave image-side surface722, and is made of plastic material. The object-side surface721and the image-side surface722of the second lens element720are aspheric.

The third lens element730with negative refractive power has a concave object-side surface731and a concave image-side surface732, and is made of plastic material. The object-side surface731and the image-side surface732of the third lens element730are aspheric.

The fourth lens element740with positive refractive power has a concave object-side surface741and a convex image-side surface742, and is made of plastic material. The object-side surface741and the image-side surface742of the fourth lens element740are aspheric.

The fifth lens element750with negative refractive power has a convex object-side surface751and a concave image-side surface752, and is made of plastic material. The object-side surface751and the image-side surface752of the fifth lens element750are aspheric. Furthermore, both of the object-side surface751and the image-side surface752of the fifth lens element750have at least one inflection point.

The IR-cut filter760is made of glass and located between the fifth lens element750and the image plane770, and will not affect the focal length of the image capturing lens system.

In the image capturing lens system according to the 7th embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 7th embodiment. Moreover, these parameters can be calculated from Table 13 and Table 14 as the following values and satisfy the following relationships:

It is to be noted that TABLES 1-14 show different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. Therefore, any optical system of the same structure is considered to be less than or equal to the scope of the present disclosure even if it uses different data. The embodiments depicted above and the appended drawings are exemplary and are not intended to limit the scope of the present disclosure.