Optical image capturing lens assembly having four lenses

This invention provides an optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power, an object-side surface and an image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof. With the aforementioned arrangement, the total track length of the lens assembly can be effectively reduced, the sensitivity of the system can be attenuated and the image quality can be improved.

CROSS-REFERENCE TO RELATED APPLICATIONS

This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 100129027 filed in Taiwan, R.O.C. on Aug. 15, 2011, the entire contents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an optical image capturing lens assembly, and more particularly to a compact optical image capturing lens assembly applicable to electronic products as well as the extended usage in the three-dimensional imaging lens assembly.

2. Description of the Prior Art

In recent years, with the popularity of compact photographing lens assembly, the demand for compact image capturing modules is increasing, and the sensor of general photographing lens assembly is none other than CCD (Charge Coupled Device) or CMOS Sensor (Complementary Metal Oxide Semiconductor Sensor). Furthermore, as advances in semiconductor manufacturing technology have allowed the pixel size of sensors to be reduced and electronic products have become more compact and powerful, there is an increasing demand for compact photographing lens assembly featuring better image quality.

Generally, a conventional compact photographing lens assembly for portable electronic devices, such as the one disclosed in U.S. Pat. No. 7,184,225, is of a triplet type comprising, in order from the object side to the image side: a first lens element with positive refractive power; a second lens element with positive refractive power; and a third lens element with negative refractive power.

With advances in semiconductor manufacturing technology and current trend of compact electronic products, the three-element lens has become insufficient for a high-end photographing optical system due to the increasing demand for a higher image quality.

A conventional high-resolution photographing lens assembly, such as the one set forth in U.S. Pat. No. 7,365,920, generally has a front stop and four lens elements, wherein two spherical-surface glass lenses serving as the first and second lens elements are adhered together to form a doublet for correcting the chromatic aberration. Such an arrangement of optical elements, however, has the following disadvantages: (1) the degree of freedom of the system is curtailed due to the employment of excess number of spherical-surface lenses, thus the total track length of the system cannot be reduced easily; (2) the process of adhering glass lenses together is complicated, posing difficulties in manufacturing. Moreover, as the size of the image capturing lens assembly is becoming smaller and the specification thereof is becoming higher, assembling lens elements tightly within a limited space predisposes unwanted light rays to be reflected for many times within a lens barrel, which will affect image quality. Thus, the unwanted light rays should be prevented from entering the image forming area so as to improve image quality. Inasmuch as the foregoing, a need exists in the art for a photographing optical system that features better image quality and a moderate total track length and is applicable to compact portable electronic devices.

SUMMARY OF THE INVENTION

The present invention provides an optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power, an object-side surface and an image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof; wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is Td, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and they satisfy the following relations: 1.25 mm<Td<1.75 mm; and −4.0<(R1+R2)/(R1−R2)<−1.3.

The present invention provides another optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a plastic second lens element with negative refractive power, at least one of an object-side surface and an image-side surface thereof being aspheric; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power having a concave image-side surface, an object-side surface and the image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof; wherein a maximum central thickness of individual lens elements of the optical image capturing lens assembly is CTmax, a minimum central thickness of individual lens elements of the optical image capturing lens assembly is CTmin, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and they satisfy the following relations: 0.25 mm<CTmax<0.50 mm; 0.11 mm<CTmin<0.25 mm; and −4.0<(R1+R2)/(R1−R2)<−1.3.

The present invention provides yet another optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a plastic second lens element with negative refractive power, at least one of an object-side surface and an image-side surface thereof being aspheric; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power having a concave image-side surface, an object-side surface and the image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof; wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is Td, a focal length of the optical image capturing lens assembly is f, a curvature radius of the object-side surface of the fourth lens element is R7, and they satisfy the following relations: 1.3 mm<Td<1.6 mm; and |f/R7|<0.25.

With the aforementioned arrangement of lens elements, the total track length of the lens assembly can be effectively reduced, the sensitivity of the system can be attenuated and the image quality can be improved.

In the present optical image capturing lens assembly, the first lens element with positive refractive power provides partial refractive power for the system, thereby favorably reducing the total track length of the system. The second lens element has negative refractive power so as to effectively correct the aberration generated by the first lens element with positive refractive power and to favorably correct the chromatic aberration of the system. The third lens element with positive refractive power cooperates with the first lens element with positive refractive power to attenuate the sensitivity of the system. The fourth lens element with negative refractive power provides partial negative refractive power for the system so that the high order aberrations of the system can be effectively corrected to improve the image resolution of the optical image capturing lens assembly.

In the present optical image capturing lens assembly, the first lens element may be a bi-convex lens element or a meniscus lens element having a convex object-side surface and a concave image-side surface. When the first lens element is a bi-convex lens element, the refractive power thereof can be effectively enhanced, thereby shortening the total track length of the system. When the first lens element is a meniscus lens element having a convex object-side surface and a concave image-side surface, the astigmatism of the system can be corrected more favorably. When the second lens element is a meniscus lens element having a convex object-side surface and a concave image-side surface, the astigmatism and aberration generated by the first lens element can be favorably corrected. When the second lens element is a bi-concave lens element, the negative refractive power thereof can be effectively enhanced, thereby the aberrations of the system can be corrected more effectively. When the third lens element has a concave object-side surface and a convex image-side surface, the astigmatism and high order aberrations of the system can be favorably corrected. When the fourth lens element has a concave image-side surface, the principal point of the optical system can be positioned away from the image plane, thereby the total track length of the system can be favorably shortened to reduce the size of the lens assembly. Moreover, the fourth lens element is provided with at least one inflection point, thereby the angle at which the light is projected onto the sensor from the off-axis field can be effectively reduced to further correct the off-axis aberrations.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention provides an optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power, an object-side surface and an image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof; wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is Td, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and they satisfy the following relations: 1.25 mm<Td<1.75 mm; and −4.0<(R1+R2)/(R1−R2)<−1.3.

When the relation of 1.25 mm<Td<1.75 mm is satisfied, the lens assembly can maintain a compact form so that it can be equipped in compact portable electronic products.

When the relation of −4.0<(R1+R2)/(R1−R2)<−1.3 is satisfied, the spherical aberrations can be effectively corrected. Preferably, R1and R2satisfy the following relation: −3.0<(R1+R2)/(R1−R2)<−1.65.

In the aforementioned optical image capturing lens assembly, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they preferably satisfy the following relation: 30<V1−V2<45. The satisfaction of the above relation facilitates the correction of the chromatic aberration of the optical image capturing lens assembly.

The aforementioned optical image capturing lens assembly further comprises a stop. An axial distance between the stop and the image-side surface of the fourth lens element is SD, the axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is Td, and they preferably satisfy the following relation: 0.85<SD/Td<1.1. When the above relation is satisfied, a good balance between the telecentric feature and the wide angle of view can be attained.

In the aforementioned optical image capturing lens assembly, a focal length of the optical image capturing lens assembly is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and they preferably satisfy the following relations: 0.2<f3/f<0.65; and −0.65<f4/f<−0.2. When the above relations are satisfied, the positive refractive power of the first lens element can be effectively distributed to attenuate the sensitivity of the system. And it will be more preferable that f, f3and f4satisfy the following relations: 0.2<f3/f<0.5, −0.5<f4/f<−0.2.

In the aforementioned optical image capturing lens assembly, an axial thickness of the second lens element is CT2, an axial thickness of the fourth lens element is CT4, and they preferably satisfy the following relation: 0.2 mm<CT2+CT4<0.46 mm. When the above relation is satisfied, the thickness of the second lens element and the fourth lens element is more appropriate, thereby facilitating the assembly and space arrangement of the lens assembly.

In the aforementioned optical image capturing lens assembly, the focal length of the optical image capturing lens assembly is f, a curvature radius of the object-side surface of the fourth lens element is R7, and they preferably satisfy the following relation: |f/R7|<0.25. When the above relation is satisfied, the aberrations of the system can be prevented from being generated so that the high order aberrations can be corrected.

In the aforementioned optical image capturing lens assembly, the focal length of the optical image capturing lens assembly is f, and it preferably satisfies the following relation: 1.5 mm<f<2.2 mm. The satisfaction of the above relation facilitates a reduction in the size of the lens assembly and enables the whole camera module to stay compact.

The present invention provides another optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a plastic second lens element with negative refractive power, at least one of an object-side surface and an image-side surface thereof being aspheric; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power having a concave image-side surface, an object-side surface and the image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof; wherein a maximum central thickness of individual lens elements of the optical image capturing lens assembly is CTmax, a minimum central thickness of individual lens elements of the optical image capturing lens assembly is CTmin, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and they satisfy the following relations: 0.25 mm<CTmax<0.50 mm; 0.11 mm<CTmin<0.25 mm; and −4.0<(R1+R2)/(R1−R2)<−1.3.

When the relation of 0.25 mm<CTmax<0.50 mm as well as the relation of 0.11 mm<CTmin<0.25 mm are satisfied, the property of individual lens thickness is proper. The lens manufacturing yield along with the moldability and homogeneity of the plastic-injection-molded lens elements can be improved.

When the relation of −4.0<(R1+R2)/(R1−R2)<−1.3 is satisfied, the spherical aberrations can be effectively corrected.

In the aforementioned optical image capturing lens assembly, the following relations can be satisfied: 0.2<f3/f<0.65 and −0.65<f4/f<−0.2; 30<V1−V2<42; |f/R7|<0.25; and 1.5 mm<f<2.2 mm. When the above relations are satisfied, numerous improvements mentioned in the previous paragraphs are made, such as correcting different types of optical aberrations as well as the size reduction of the optical image capturing lens assembly.

The present invention provides yet another optical image capturing lens assembly comprising four lens elements, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a plastic second lens element with negative refractive power, at least one of an object-side surface and an image-side surface thereof being aspheric; a plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power having a concave image-side surface, an object-side surface and the image-side surface thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof; wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is Td, a focal length of the optical image capturing lens assembly is f, a curvature radius of the object-side surface of the fourth lens element is R7, and they satisfy the following relations: 1.3 mm<Td<1.6 mm; and |f/R7|<0.25.

When the relation of 1.3 mm<Td<1.6 mm is satisfied, the lens assembly can maintain a compact form so that it can be equipped in compact portable electronic products.

When the relation of |f/R7|<0.25 is satisfied, the aberrations of the system can be prevented from being generated, so that the high order aberrations can be corrected.

In the aforementioned optical image capturing lens assembly, the following relation can be satisfied: −4.0<(R1+R2)/(R1−R2)<−1.3; 0.2 mm<CT2+CT4<0.46 mm; 0.2<f3/f<0.65 and −0.65<f4/f<−0.2; 30<V1−V2<42; 1.5 mm<f<2.2 mm. When the above relation is satisfied, numerous improvements mentioned in the previous paragraphs are made, such as correcting different types of optical aberrations as well as the size reduction of the optical image capturing lens assembly.

In the present optical image capturing lens assembly, the lens elements can be made of glass or plastic material. If the lens elements are made of glass, there is more freedom in distributing the refractive power of the optical image capturing lens assembly. If plastic material is adopted to produce the lens elements, the production cost will be reduced effectively. Additionally, the surfaces of the lens elements can be aspheric and easily made into non-spherical profiles, allowing more design parameter freedom which can be used to reduce aberrations and the total required number of the lens elements within an optical system. Consequently, the total track length of the optical image capturing lens assembly can be effectively reduced.

In the present optical image capturing lens assembly, if a lens element has a convex surface, it means the surface in proximity to the optical axis is convex; if a lens element has a concave surface, it means the surface in proximity to the optical axis is concave.

The present optical image capturing lens assembly can be provided with at least one stop, such as a glare stop or a field stop, to eliminate stray light, thereby the image quality can be favorably improved. Additionally, there can be an aperture stop allocated in front, within, or in the rear of the optical image capturing lens assembly, according to the preference of the optical designer.

Preferred embodiments of the present invention will be described in the following paragraphs by referring to the accompanying drawings.

FIG. 1Ashows an optical image capturing lens assembly in accordance with a first embodiment of the present invention, andFIG. 1Bshows the aberration curves of the first embodiment of the present invention. The optical image capturing lens assembly of the first embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element110with positive refractive power having a convex object-side surface111and a concave image-side surface112, the object-side and image-side surfaces111and112thereof being aspheric;

a plastic second lens element120with negative refractive power having a concave object-side surface121and a concave image-side surface122, the object-side and image-side surfaces121and122thereof being aspheric;

a plastic third lens element130with positive refractive power having a concave object-side surface131and a convex image-side surface132, the object-side and image-side surfaces131and132thereof being aspheric; and

a plastic fourth lens element140with negative refractive power having a concave object-side surface141and a concave image-side surface142, the object-side and image-side surfaces141and142thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces141and142thereof.

The optical image capturing lens assembly is also provided with a stop100disposed between an imaged object and the first lens element110.

The optical image capturing lens assembly further comprises an IR-filter150disposed between the image-side surface142of the fourth lens element140and an image plane161; the IR-filter150is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor160is disposed on the image plane161.

The detailed optical data of the first embodiment is shown in TABLE 1, and the aspheric surface data is shown in TABLE 2, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles is expressed as follows:

X: the distance of a point on the aspheric surface at a distance Y from the optical axis relative to the tangential plane at the aspheric surface vertex;

Y: the distance from the point on the curve of the aspheric surface to the optical axis;

Ai: the aspheric coefficient of order i.

In the first embodiment of the present optical image capturing lens assembly, the focal length of the optical image capturing lens assembly is f, and it satisfies the relation: f=1.83 (mm).

In the first embodiment of the present optical image capturing lens assembly, the f-number of the optical image capturing lens assembly is Fno, and it satisfies the relation: Fno=2.45.

In the first embodiment of the present optical image capturing lens assembly, half of the maximal field of view of the optical image capturing lens assembly is HFOV, and it satisfies the relation: HFOV=35.0 deg.

In the first embodiment of the present optical image capturing lens assembly, the Abbe number of the first lens element110is V1, the Abbe number of the second lens element120is V2, and they satisfy the relation: V1−V2=32.1.

In the first embodiment of the present optical image capturing lens assembly, the maximum central thickness of individual lens elements of the optical image capturing lens assembly is CTmax, and it satisfies the relation: CTmax=0.39 mm.

In the first embodiment of the present optical image capturing lens assembly, the minimum central thickness of individual lens elements of the optical image capturing lens assembly is CTmin, and it satisfies the relation: CTmin=0.15 mm.

In the first embodiment of the present optical image capturing lens assembly, the axial distance between the object-side surface111of the first lens element110and the image-side surface142of the fourth lens element140is Td, and it satisfies the relation: Td=1.49 mm.

In the first embodiment of the present optical image capturing lens assembly, the curvature radius of the object-side surface111of the first lens element110is R1, the curvature radius of the image-side surface112of the first lens element110is R2, and they satisfy the relation: (R1+R2)/(R1−R2)=−2.31.

In the first embodiment of the present optical image capturing lens assembly, the focal length of the optical image capturing lens assembly is f, the curvature radius of the object-side surface141of the fourth lens element140is R7, and they satisfy the relation: |f/R7|=−0.04.

In the first embodiment of the present optical image capturing lens assembly, the focal length of the optical image capturing lens assembly is f, the focal length of the third lens element130is f3, and they satisfy the relation: f3/f=0.55.

In the first embodiment of the present optical image capturing lens assembly, the focal length of the optical image capturing lens assembly is f, the focal length of the fourth lens element140is f4, and they satisfy the relation: f4/f=−0.58.

In the first embodiment of the present optical image capturing lens assembly, the axial distance between the stop100and the image-side surface142of the fourth lens element140is SD, the axial distance between the object-side surface111of the first lens element110and the image-side surface142of the fourth lens element140is Td, and they satisfy the relation: SD/Td=0.93.

FIG. 2Ashows an optical image capturing lens assembly in accordance with a second embodiment of the present invention, andFIG. 2Bshows the aberration curves of the second embodiment of the present invention. The optical image capturing lens assembly of the second embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element210with positive refractive power having a convex object-side surface211and a concave image-side surface212, the object-side and image-side surfaces211and212thereof being aspheric;

a plastic second lens element220with negative refractive power having a concave object-side surface221and a concave image-side surface222, the object-side and image-side surfaces221and222thereof being aspheric;

a plastic third lens element230with positive refractive power having a concave object-side surface231and a convex image-side surface232, the object-side and image-side surfaces231and232thereof being aspheric; and

a plastic fourth lens element240with negative refractive power having a concave object-side surface241and a concave image-side surface242, the object-side and image-side surfaces241and242thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces241and242thereof.

The optical image capturing lens assembly is also provided with a stop200disposed between an imaged object and the first lens element210.

The optical image capturing lens assembly further comprises an IR-filter250disposed between the image-side surface242of the fourth lens element240and an image plane261; the IR-filter250is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor260is disposed on the image plane261.

The detailed optical data of the second embodiment is shown in TABLE 3, and the aspheric surface data is shown in TABLE 4, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the second embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the second embodiment are listed in TABLE 5 below:

FIG. 3Ashows an optical image capturing lens assembly in accordance with a third embodiment of the present invention, andFIG. 3Bshows the aberration curves of the third embodiment of the present invention. The optical image capturing lens assembly of the third embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element310with positive refractive power having a convex object-side surface311and a convex image-side surface312, the object-side and image-side surfaces311and312thereof being aspheric;

a plastic second lens element320with negative refractive power having a concave object-side surface321and a concave image-side surface322, the object-side and image-side surfaces321and322thereof being aspheric;

a plastic third lens element330with positive refractive power having a concave object-side surface331and a convex image-side surface332, the object-side and image-side surfaces331and332thereof being aspheric; and

a plastic fourth lens element340with negative refractive power having a concave object-side surface341and a concave image-side surface342, the object-side and image-side surfaces341and342thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces341and342thereof.

The optical image capturing lens assembly is also provided with a stop300disposed between an imaged object and the first lens element310.

The optical image capturing lens assembly further comprises an IR-filter350disposed between the image-side surface342of the fourth lens element340and an image plane361; the IR-filter350is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor360is disposed on the image plane361.

The detailed optical data of the third embodiment is shown in TABLE 6, and the aspheric surface data is shown in TABLE 7, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the third embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the third embodiment are listed in TABLE 8 below:

FIG. 4Ashows an optical image capturing lens assembly in accordance with a fourth embodiment of the present invention, andFIG. 4Bshows the aberration curves of the fourth embodiment of the present invention. The optical image capturing lens assembly of the fourth embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element410with positive refractive power having a convex object-side surface411and a concave image-side surface412, the object-side and image-side surfaces411and412thereof being aspheric;

a plastic second lens element420with negative refractive power having a concave object-side surface421and a concave image-side surface422, the object-side and image-side surfaces421and422thereof being aspheric;

a plastic third lens element430with positive refractive power having a concave object-side surface431and a convex image-side surface432, the object-side and image-side surfaces431and432thereof being aspheric; and

a plastic fourth lens element440with negative refractive power having a convex object-side surface441and a concave image-side surface442, the object-side and image-side surfaces441and442thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces441and442thereof.

The optical image capturing lens assembly is also provided with a stop400disposed between an imaged object and the first lens element410.

The optical image capturing lens assembly further comprises an IR-filter450disposed between the image-side surface442of the fourth lens element440and an image plane461; the IR-filter450is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor460is disposed on the image plane461.

The detailed optical data of the fourth embodiment is shown in TABLE 9, and the aspheric surface data is shown in TABLE 10, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the fourth embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the fourth embodiment are listed in TABLE 11 below:

FIG. 5Ashows an optical image capturing lens assembly in accordance with a fifth embodiment of the present invention, andFIG. 5Bshows the aberration curves of the fifth embodiment of the present invention. The optical image capturing lens assembly of the fifth embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element510with positive refractive power having a convex object-side surface511and a concave image-side surface512, the object-side and image-side surfaces511and512thereof being aspheric;

a plastic second lens element520with negative refractive power having a convex object-side surface521and a concave image-side surface522, the object-side and image-side surfaces521and522thereof being aspheric;

a plastic third lens element530with positive refractive power having a concave object-side surface531and a convex image-side surface532, the object-side and image-side surfaces531and532thereof being aspheric; and

a plastic fourth lens element540with negative refractive power having a concave object-side surface541and a concave image-side surface542, the object-side and image-side surfaces541and542thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces541and542thereof.

The optical image capturing lens assembly is also provided with a stop500disposed between an imaged object and the first lens element510.

The optical image capturing lens assembly further comprises an IR-filter550disposed between the image-side surface542of the fourth lens element540and an image plane561; the IR-filter550is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor560is disposed on the image plane561.

The detailed optical data of the fifth embodiment is shown in TABLE 12, and the aspheric surface data is shown in TABLE 13, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the fifth embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the fifth embodiment are listed in TABLE 14 below:

FIG. 6Ashows an optical image capturing lens assembly in accordance with a sixth embodiment of the present invention, andFIG. 6Bshows the aberration curves of the sixth embodiment of the present invention. The optical image capturing lens assembly of the sixth embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element610with positive refractive power having a convex object-side surface611and a concave image-side surface612, the object-side and image-side surfaces611and612thereof being aspheric;

a plastic second lens element620with negative refractive power having a convex object-side surface621and a concave image-side surface622, the object-side and image-side surfaces621and622thereof being aspheric;

a plastic third lens element630with positive refractive power having a concave object-side surface631and a convex image-side surface632, the object-side and image-side surfaces631and632thereof being aspheric; and

a plastic fourth lens element640with negative refractive power having a convex object-side surface641and a concave image-side surface642, the object-side and image-side surfaces641and642thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces641and642thereof.

The optical image capturing lens assembly is also provided with a stop600disposed between an imaged object and the first lens element610.

The optical image capturing lens assembly further comprises an IR-filter650disposed between the image-side surface642of the fourth lens element640and an image plane661; the IR-filter650is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor660is disposed on the image plane661.

The detailed optical data of the sixth embodiment is shown in TABLE 15, and the aspheric surface data is shown in TABLE 16, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the sixth embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the sixth embodiment are listed in TABLE 17 below:

FIG. 7Ashows an optical image capturing lens assembly in accordance with a seventh embodiment of the present invention, andFIG. 7Bshows the aberration curves of the seventh embodiment of the present invention. The optical image capturing lens assembly of the seventh embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element710with positive refractive power having a convex object-side surface711and a concave image-side surface712, the object-side and image-side surfaces711and712thereof being aspheric;

a plastic second lens element720with negative refractive power having a concave object-side surface721and a concave image-side surface722, the object-side and image-side surfaces721and722thereof being aspheric;

a plastic third lens element730with positive refractive power having a concave object-side surface731and a convex image-side surface732, the object-side and image-side surfaces731and732thereof being aspheric; and

a plastic fourth lens element740with negative refractive power having a convex object-side surface741and a concave image-side surface742, the object-side and image-side surfaces741and742thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces741and742thereof.

The optical image capturing lens assembly is also provided with a stop700disposed between an imaged object and the first lens element710.

The optical image capturing lens assembly further comprises an IR-filter750disposed between the image-side surface742of the fourth lens element740and an image plane761; the IR-filter750is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor760is disposed on the image plane761.

The detailed optical data of the seventh embodiment is shown in TABLE 18, and the aspheric surface data is shown in TABLE 19, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the seventh embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the seventh embodiment are listed in TABLE 20 below:

FIG. 8Ashows an optical image capturing lens assembly in accordance with an eighth embodiment of the present invention, andFIG. 8Bshows the aberration curves of the eighth embodiment of the present invention. The optical image capturing lens assembly of the eighth embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element810with positive refractive power having a convex object-side surface811and a convex image-side surface812, the object-side and image-side surfaces811and812thereof being aspheric;

a plastic second lens element820with negative refractive power having a concave object-side surface821and a concave image-side surface822, the object-side and image-side surfaces821and822thereof being aspheric;

a plastic third lens element830with positive refractive power having a concave object-side surface831and a convex image-side surface832, the object-side and image-side surfaces831and832thereof being aspheric; and

a plastic fourth lens element840with negative refractive power having a concave object-side surface841and a concave image-side surface842, the object-side and image-side surfaces841and842thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces841and842thereof.

The optical image capturing lens assembly is also provided with a stop800disposed between an imaged object and the first lens element810.

The optical image capturing lens assembly further comprises an IR-filter850disposed between the image-side surface842of the fourth lens element840and an image plane861; the IR-filter850is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor860is disposed on the image plane861.

The detailed optical data of the eighth embodiment is shown in TABLE 21, and the aspheric surface data is shown in TABLE 22, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the eighth embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the eighth embodiment are listed in TABLE 23 below:

FIG. 9Ashows an optical image capturing lens assembly in accordance with a ninth embodiment of the present invention, andFIG. 9Bshows the aberration curves of the ninth embodiment of the present invention. The optical image capturing lens assembly of the ninth embodiment of the present invention mainly comprises four lens elements, in order from an object side to an image side:

a plastic first lens element910with positive refractive power having a convex object-side surface911and a convex image-side surface912, the object-side and image-side surfaces911and912thereof being aspheric;

a plastic second lens element920with negative refractive power having a concave object-side surface921and a concave image-side surface922, the object-side and image-side surfaces921and922thereof being aspheric;

a plastic third lens element930with positive refractive power having a concave object-side surface931and a convex image-side surface932, the object-side and image-side surfaces931and932thereof being aspheric; and

a plastic fourth lens element940with negative refractive power having a convex object-side surface941and a concave image-side surface942, the object-side and image-side surfaces941and942thereof being aspheric, at least one inflection point being formed on at least one of the object-side and image-side surfaces941and942thereof.

The optical image capturing lens assembly is also provided with a stop900disposed between an imaged object and the first lens element910.

The optical image capturing lens assembly further comprises an IR-filter950disposed between the image-side surface942of the fourth lens element940and an image plane961; the IR-filter950is made of glass and has no influence on the focal length of the optical image capturing lens assembly. Moreover, an image sensor960is disposed on the image plane961.

The detailed optical data of the ninth embodiment is shown in TABLE 24, and the aspheric surface data is shown in TABLE 25, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view.

The equation of the aspheric surface profiles of the ninth embodiment has the same form as that of the first embodiment. Moreover, the definitions of the parameters of the relations are the same as those set forth in the first embodiment, but the values of the relations of the ninth embodiment are listed in TABLE 26 below:

It is to be noted that TABLES 1-26 show different data of the different embodiments, however, the data of the different embodiments are obtained from experiments. Therefore, any optical image capturing lens assembly of the same structure is considered to be within the scope of the present invention 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 invention.