Mobile device and optical imaging lens thereof

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements and designing an equation, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

INCORPORATION BY REFERENCE

This application claims priority from R.O.C. Patent Application No. 102123325, filed on Jun. 28, 2013, the contents of which are hereby incorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaging lens thereof, and particularly, relates to a mobile device applying an optical imaging lens having five lens elements and an optical imaging lens thereof.

BACKGROUND

The ever-increasing demand for smaller sized mobile devices, such as cell phones, digital cameras, etc., correspondingly triggered a growing need for a smaller sized photography module, comprising elements such as an optical imaging lens, a module housing unit, and an image sensor, etc., contained therein. Size reductions may be obtained from various aspects of the mobile devices, which includes not only the charge coupled device (CCD) and the complementary metal-oxide semiconductor (CMOS), but also the optical imaging lens mounted therein. When reducing the size of the optical imaging lens, however, achieving good optical characteristics become a challenging problem.

Both U.S. Pat. No. 7,480,105 and Japan Patent Publication No. 4197994 disclose an optical imaging lens constructed with an optical imaging lens having five lens elements, wherein the length of the optical imaging lens, from the object-side surface of the first lens element to the image plane, reaches 8 mm, which is too long for smaller sized mobile devices. Therefore, there is a need to develop an optical imaging lens which is capable of placing five lens elements therein, with a shorter length, while also have good optical characteristics.

SUMMARY

An object of the present invention is to provide a mobile device and an optical imaging lens thereof. With controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements and designing an equation, the length of the optical imaging lens is shortened and meanwhile the good optical characteristics and system functionality are maintained.

In an exemplary embodiment, an optical imaging lens comprises, sequentially from an object side to an image side along an optical axis, which comprises first, second, third, fourth and fifth lens elements, each of the first, second, third, fourth and fifth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side. The object-side surface of the first lens element comprises a convex portion in a vicinity of the optical axis. The second lens element has positive refracting power. The image-side surface of the fourth lens element comprises a convex portion in a vicinity of the optical axis. The image-side surface of the fifth lens element comprises a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the fifth lens element. The optical imaging lens as a whole comprises only the five lens elements having refracting power and the distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element along the optical axis is TL. A central thickness of the fifth lens element along the optical axis is CT5, and TL and CT5 satisfy the equation:
TL/CT5≦7.80  Equation (1).

In another exemplary embodiment, other equation(s), such as those relating to the ratio among parameters could be taken into consideration. For example, a central thickness of the third lens element along the optical axis is CT3. An air gap between the second lens element and the third lens element along the optical axis is AC23. An air gap between the third lens element and the fourth lens element along the optical axis is AC34, that could be controlled to satisfy the equation as follows:
1.10≦(AC23+AC34)/CT3  Equation (2); or

TL and the sum of all four air gaps from the first lens element to the fifth lens element along the optical axis, AAG, could be controlled to satisfy the equation(s) as follows:
4.30≦TL/AAGEquation (3); or

CT3, CT5 and a central thickness of the first lens element along the optical axis, CT1, could be controlled to satisfy the equation as follows:
3.75≦(CT1+CT5)/CT3  Equation (4); or

TL, AC23, an air gap between the first lens element and the second lens element along the optical axis, AC12, and an air gap between the fourth lens element and the fifth lens element along the optical axis, AC45, could be controlled to satisfy the equation as follows:
9.80≦TL/(AC12+AC23+AC45)  Equation (5); or

CT5, AC12, AC23 and AC45 could be controlled to satisfy the equation as follows:
1.85≦CT5/(AC12+AC23+AC45)  Equation (6); or

CT3 and a central thickness of the fourth lens element along the optical axis, CT4, could be controlled to satisfy the equation as follows:
1.60≦CT4/CT3≦3.40  Equation (7); or

AC12, AC23 and AC45 could be controlled to satisfy the equation as follows:
AC23/(AC12+AC45)≦2.00  Equation (8); or

AC12, AC23, AC34 and AC45 could be controlled to satisfy the equation as follows:
1.60≦AC34/(AC12+AC23+AC45)  Equation (9); or

CT1, AC12, AC23 and AC45 could be controlled to satisfy the equation as follows:
1.80≦CT1/(AC12+AC23+AC45)  Equation (10); or

CT4, AC12 and AC45 could be controlled to satisfy the equation as follows:
5.50≦CT4/(AC12+AC45)  Equation (11); or

TL and AC34 could be controlled to satisfy the equation as follows:
TL/AC34≦10.30  Equation (12); or

CT1, CT3, CT4 and CT5 could be controlled to satisfy the equation as follows:
4.00≦(CT1+CT4+CT5)/CT3  Equation (13); or

AAG and AC34 could be controlled to satisfy the equation as follows:
AAG/AC34≦1.60  Equation (14).

Aforesaid exemplary embodiments are not limited and could be selectively incorporated in other embodiments described herein.

In some exemplary embodiments, more details about the convex or concave surface structure or the position of an aperture stop could be incorporated for one specific lens element or broadly for plural lens elements to enhance the control for the system performance and/or resolution. For example, an aperture stop could be positioned before the first lens element, etc. It is noted that the details listed here could be incorporated in example embodiments if no inconsistency occurs.

In another exemplary embodiment, a mobile device comprising a housing and a photography module positioned in the housing is provided. The photography module comprises any of the aforesaid example embodiments of optical imaging lens, such as, a lens barrel, a module housing unit and an image sensor. The lens barrel is for positioning the optical imaging lens, the module housing unit is for positioning the lens barrel, the substrate is for positioning the module housing unit and the image sensor is positioned at the image side of the optical imaging lens.

Through controlling the convex or concave shape of the surfaces and/or the refraction power of the lens element(s), the mobile device and the optical imaging lens thereof in exemplary embodiments achieve good optical characteristics and effectively shorten the length of the optical imaging lens.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features. Persons having ordinary skill in the art will understand other varieties for implementing example embodiments, including those described herein. The drawings are not limited to specific scale and similar reference numbers are used for representing similar elements. As used in the disclosures and the appended claims, the terms “example embodiment,” “exemplary embodiment,” and “present embodiment” do not necessarily refer to a single embodiment, although it may, and various example embodiments may be readily combined and interchanged, without departing from the scope or spirit of the present invention. Furthermore, the terminology as used herein is for the purpose of describing example embodiments only and is not intended to be a limitation of the invention. In this respect, as used herein, the term “in” may include “in” and “on”, and the terms “a”, “an” and “the” may include singular and plural references. Furthermore, as used herein, the term “by” may also mean “from”, depending on the context. Furthermore, as used herein, the term “if” may also mean “when” or “upon”, depending on the context. Furthermore, as used herein, the words “and/or” may refer to and encompass any and all possible combinations of one or more of the associated listed items.

Here in the present specification, “a lens element having positive refracting power (or negative refracting power)” means that the lens element has positive refracting power (or negative refracting power) in the vicinity of the optical axis. “An object-side (or image-side) surface of a lens element comprises a convex (or concave) portion in a specific region” means that the object-side (or image-side) surface of the lens element “protrudes outwardly (or depresses inwardly)” along the direction parallel to the optical axis at the specific region, compared with the outer region radially adjacent to the specific region. TakingFIG. 1, for example, the lens element shown therein is radially symmetric around the optical axis which is labeled by I. The object-side surface of the lens element comprises a convex portion at region A, a concave portion at region B, and another convex portion at region C. This is because compared with the outer region radially adjacent to the region A (i.e. region B), the object-side surface protrudes outwardly at the region A, compared with the region C, the object-side surface depresses inwardly at the region B, and compared with the region E, the object-side surface protrudes outwardly at the region C. Here, “in a vicinity of a periphery of a lens element” means that in a vicinity of the peripheral region of a surface for passing imaging light on the lens element, i.e., the region C as shown inFIG. 1. The imaging light comprises chief ray Lc and marginal ray Lm. “In a vicinity of the optical axis” means that in a vicinity of the optical axis of a surface for passing the imaging light on the lens element, i.e., the region A as shown inFIG. 1. Further, a lens element could comprise an extending portion E for mounting the lens element in an optical imaging lens. Ideally, the imaging light would not pass the extending portion E. Here the extending portion E is only for example, the structure and shape thereof are not limited to this specific example. Please also note that the extending portion of all the lens elements in the example embodiments shown below are not shown in order to maintain clean and concise drawings.

Example embodiments of an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, each of the lens elements comprise an object-side surface facing toward an object side and an image-side surface facing toward an image side. These lens elements may be arranged sequentially from the object side to the image side along an optical axis, and example embodiments of the lens as a whole may comprise only the five lens elements having refracting power. In an example embodiment: the object-side surface of the first lens element comprises a convex portion in a vicinity of the optical axis; the second lens element has positive refracting power; the image-side surface of the fourth lens element comprises a convex portion in a vicinity of the optical axis; the image-side surface of the fifth lens element comprises a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the fifth lens element; and the distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TL, a central thickness of the fifth lens element along the optical axis is CT5, and TL and CT5 satisfy the equation:
TL/CT5≦7.80  Equation (1).

Preferably, the lens elements are designed in light of the optical characteristics and the length of the optical imaging lens. For example, the second lens element having positive refracting power can assist in increasing the light convergence ability of the optical imaging lens, and combined with the aperture stop positioned before the first lens element, the length of the optical imaging lens can be effectively shortened. All the details of shape on the surfaces of the lens elements, such as the convex portion in a vicinity of the optical axis on the object-side surface of the first lens element, the convex portion in a vicinity of the optical axis on the image-side surface of the fourth lens element, the concave portion in a vicinity of the optical axis on the image-side surface of the fifth lens element and the convex portion in a vicinity of a periphery of the fifth lens element on the image-side surface thereof, could assist in eliminating the aberration of the optical imaging lens. Additionally, all these details could promote the image quality of the whole system.

In another exemplary embodiment, some equation(s) of parameters, such as those relating to the ratio among parameters could be taken into consideration. For example, a central thickness of the third lens element along the optical axis, CT3, an air gap between the second lens element and the third lens element along the optical axis, AC23, an air gap between the third lens element and the fourth lens element along the optical axis, AC34, could be controlled to satisfy the equation as follows:
1.10≦(AC23+AC34)/CT3  Equation (2); or

TL and the sum of all four air gaps from the first lens element to the fifth lens element along the optical axis, AAG, could be controlled to satisfy the equation(s) as follows:
4.30≦TL/AAGEquation (3); or

CT3, CT5 and a central thickness of the first lens element along the optical axis, CT1, could be controlled to satisfy the equation as follows:
3.75≦(CT1+CT5)/CT3  Equation (4); or

TL, AC23, an air gap between the first lens element and the second lens element along the optical axis, AC12, and an air gap between the fourth lens element and the fifth lens element along the optical axis, AC45, could be controlled to satisfy the equation as follows:
9.80≦TL/(AC12+AC23+AC45)  Equation (5); or

CT5, AC12, AC23 and AC45 could be controlled to satisfy the equation as follows:
1.85≦CT5/(AC12+AC23+AC45)  Equation (6); or

CT3 and a central thickness of the fourth lens element along the optical axis, CT4, could be controlled to satisfy the equation as follows:
1.60≦CT4/CT3≦3.40  Equation (7); or

AC12, AC23 and AC45 could be controlled to satisfy the equation as follows:
AC23/(AC12+AC45)≦2.00  Equation (8); or

AC12, AC23, AC34 and AC45 could be controlled to satisfy the equation as follows:
1.60≦AC34/(AC12+AC23+AC45)  Equation (9); or

CT1, AC12, AC23 and AC45 could be controlled to satisfy the equation as follows:
1.80≦CT1/(AC12+AC23+AC45)  Equation (10); or

CT4, AC12 and AC45 could be controlled to satisfy the equation as follows:
5.50≦CT4/(AC12+AC45)  Equation (11); or

TL and AC34 could be controlled to satisfy the equation as follows:
TL/AC34≦10.30  Equation (12); or

CT1, CT3, CT4 and CT5 could be controlled to satisfy the equation as follows:
4.00≦(CT1+CT4+CT5)/CT3  Equation (13); or

AAG and AC34 could be controlled to satisfy the equation as follows:
AAG/AC34≦1.60  Equation (14).

Aforesaid exemplary embodiments are not limited and could be selectively incorporated in other embodiments described herein.

Reference is now made to Equation (1). TL/CT5 is composed by a parameter more likely to be varied, i.e., TL here, and a parameter less likely to be varied, i.e., CT5 here. Shortening of CT5 is limited by its significant effective diameter, but shortening of TL is a way to shorten the length of the optical imaging lens. Therefore with the help of Equation (1), the values of TL and CT5 can be effectively reduced and controlled within a proper range, as well as the length of the optical imaging lens. Additionally, the value of TL/CT5 is suggested for a lower limit, such as 4.0≦TL/CT5≦7.8.

Reference is now made to Equation (2). Considering the smaller effective diameter of the third lens element that provides greater potential to shorten its thickness as well as the length of the optical imaging lens, here the equation is designed. When Equation (2) is satisfied, the values of CT3, AC23 and AC34 are configured properly. Additionally, the value of (AC23+AC34)/CT3 is suggested for an upper limit, such as 1.10≦(AC23+AC34)/CT3≦2.50.

Reference is now made to Equation (3). The equation is designed to address the difficulty faced and precision required in the assembly process which limits the shortening of the air gaps. When Equation (3) is satisfied, the thickness of each lens element and each air gap are configured properly. Additionally, the value of TL/AAG is suggested for an upper limit, such as 4.30≦TL/AAG≦6.60.

Reference is now made to Equations (4). Considering shortening of CT5 is limited by its significant effective diameter and shortening of CT3 has more potential due to its smaller effective diameter, here the equation is designed for configuring CT1, CT3 and CT5 properly. Additionally, the value of (CT1+CT5)/CT3 is suggested for an upper limit, such as 3.75≦(CT1+CT5)/CT3≦6.00.

Reference is now made to Equation (5). Considering the difficulty faced and precision required in the assembly process which limits the shortening of the air gaps, here the equation is designed. When Equation (5) is satisfied, the values of TL, AC12, AC23 and AC45 are configured properly. Additionally, the value of TL/(AC12+AC23+AC45) is suggested for an upper limit, such as 9.80≦TL/(AC12+AC23+AC45)≦17.00.

Reference is now made to Equation (6). The equation is designed to address that the shortening of CT5 is limited by its significant effective diameter. When Equation (6) is satisfied, the values of CT5, AC12, AC23 and AC45 are configured properly. Additionally, the value of CT5/(AC12+AC23+AC45) is suggested for a lower limit, such as 1.85≦CT5/(AC12+AC23+AC45)≦3.70.

Reference is now made to Equation (7). Considering shortening of CT3 has more potential than shortening of CT4 due to the smaller effective diameter of the third lens element, the equation is designed for configuring CT3 and CT4 properly.

Reference is now made to Equation (8). Considering shortening of AC12 and AC45 have more potential than shortening of AC23, the equation is designed for configuring AC12, AC23 and AC45 properly. Additionally, the value of AC23/(AC12+AC45) is suggested for a lower limit, such as 0.20≦AC23/(AC12+AC45)≦2.00.

Reference is now made to Equation (9). It is understood that shortening each air gap effectively may result in a shortened length of the optical imaging lens and also good optical characteristics. Considering shortening of AC12, AC23 and AC45 have more potential than shortening of AC34, the equation is designed for configuring AC12, AC23, AC34 and AC45 properly. Additionally, the value of AC34/(AC12+AC23+AC45) is suggested for an upper limit, such as 1.60≦AC34/(AC12+AC23+AC45)≦3.40.

Reference is now made to Equation (10). Considering shortening of AC12, AC23 and AC45 have more potential than shortening of CT1, the equation is designed for configuring CT1, AC12, AC23 and AC45 properly. Additionally, the value of CT1/(AC12+AC23+AC45) is suggested for an upper limit, such as 1.80≦CT1/(AC12+AC23+AC45)≦3.50.

Reference is now made to Equation (11). Considering shortening of AC12 and AC45 have more potential than shortening of CT4, the equation is designed for configuring CT4, AC12 and AC45 properly. Additionally, the value of CT4/(AC12+AC45) is suggested for a lower limit, such as 5.50≦CT4/(AC12+AC45)≦6.90.

Reference is now made to Equation (12). Considering shortening of TL have more potential than shortening of AC34, the equation is designed for configuring TL and AC34 properly. Additionally, the value of TL/AC34 is suggested for a lower limit, such as 6.00≦TL/AC34≦10.30.

Reference is now made to Equation (13). Considering shortening of CT1, CT4 and CT5 are limited by their light convergence function or significant effective diameter and shortening of CT3 has more potential due to its smaller effective diameter, the equation is designed for configuring CT3, CT4 and CT5 properly to achieve a shorter length of the optical imaging lens. Additionally, the value of (CT1+CT4+CT5)/CT3 is suggested for an upper limit, such as 4.00≦(CT1+CT4+CT5)/CT3≦8.50.

Reference is now made to Equation (14). Considering shortening of AAG have more potential than shortening of AC34, the equation is designed for configuring AAG and AC34 properly. Additionally, the value of AAG/AC34 is suggested for a lower limit, such as 1.10≦AAG/AC34≦1.60.

When implementing example embodiments, more details about the convex or concave surface structure and/or the position of an aperture stop may be incorporated for one specific lens element or broadly for plural lens elements to enhance the control of the system performance and/or resolution, as illustrated in the following embodiments. For example, an aperture stop could be positioned before the first lens element, etc. It is noted that the details listed here could be incorporated in example embodiments if no inconsistency occurs.

Several exemplary embodiments and associated optical data will now be provided for illustrating example embodiments of optical imaging lens with good optical characteristics and a shortened length. Reference is now made toFIGS. 2-5.FIG. 2illustrates an example cross-sectional view of an optical imaging lens1having five lens elements of the optical imaging lens according to a first example embodiment.FIG. 3shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens1according to an example embodiment.FIG. 4illustrates an example table of optical data of each lens element of the optical imaging lens1according to an example embodiment.FIG. 5depicts an example table of aspherical data of the optical imaging lens1according to an example embodiment.

As shown inFIG. 2, the optical imaging lens1of the present embodiment comprises, in order from an object side A1 to an image side A2 along an optical axis, an aperture stop100, a first lens element110, a second lens element120, a third lens element130, a fourth lens element140and a fifth lens element150. A filtering unit160and an image plane170of an image sensor are positioned at the image side A2 of the optical lens1. Each of the first, second, third, fourth, fifth lens elements110,120,130,140,150and the filtering unit160comprises an object-side surface111/121/131/141/151/161facing toward the object side A1 and an image-side surface112/122/132/142/152/162facing toward the image side A2. The example embodiment of the filtering unit160illustrated is an IR cut filter (infrared cut filter) positioned between the fifth lens element150and an image plane170. The filtering unit160selectively absorbs light with specific wavelength from the light passing optical imaging lens1. For example, IR light is absorbed, and this will prohibit the IR light which is not seen by human eyes from producing an image on the image plane170.

Exemplary embodiments of each lens element of the optical imaging lens1which may be constructed by plastic material will now be described with reference to the drawings.

An example embodiment of the first lens element110may have positive refracting power. The object-side surface111and the image-side surface112are convex surfaces. The object-side surface111further comprises a convex portion1111in a vicinity of a periphery of the optical axis.

An example embodiment of the second lens element120may have positive refracting power. The object-side surface121is a concave surface and the image-side surface122is a convex surface.

An example embodiment of the third lens element130may have negative refracting power. The object-side surface131comprises a convex portion1311in a vicinity of the optical axis and a concave portion1312in a vicinity of a periphery of the third lens element130. The image-side surface132comprises a concave portion1321in a vicinity of the optical axis and a convex portion1322in a vicinity of a periphery of the third lens element130.

An example embodiment of the fourth lens element140may have positive refracting power. The object-side surface141is a concave surface. The image-side surface142comprises a convex portion1421in a vicinity of the optical axis and a concave portion1422in a vicinity of a periphery of the fourth lens element140.

An example embodiment of the fifth lens element150may have negative refracting power. The object-side surface151comprises a convex portion1511in a vicinity of the optical axis and a concave portion1512in a vicinity of a periphery of the fifth lens element150. The image-side surface152comprises a concave portion1521in a vicinity of the optical axis and a convex portion1522in a vicinity of a periphery of the fifth lens element150.

In example embodiments, air gaps exist between the lens elements110,120,130,140,150, the filtering unit160and the image plane170of the image sensor. For example,FIG. 1illustrates the air gap d1 existing between the first lens element110and the second lens element120, the air gap d2 existing between the second lens element120and the third lens element130, the air gap d3 existing between the third lens element130and the fourth lens element140, the air gap d4 existing between the fourth lens element140and the fifth lens element150, the air gap d5 existing between the fifth lens element150and the filtering unit160, and the air gap d6 existing between the filtering unit160and the image plane170of the image sensor. However, in other embodiments, any of the aforesaid air gaps may or may not exist. For example, the profiles of opposite surfaces of any two adjacent lens elements may correspond to each other, and in such situation, the air gap may not exist. The air gap d1 is denoted by AC12, the air gap d2 is denoted by AC23, the air gap d3 is denoted by AC34, the air gap d4 is denoted by AC45, and the sum of all air gaps d1, d2, d3 and d4 between the first and fifth lens elements110,150is denoted by AAG.

wherein the distance from the object-side surface111of the first lens element110to the image plane170along the optical axis is 3.77 mm, and the length of the optical imaging lens1is shortened.

The aspherical surfaces, including the object-side surface111and the image-side surface112of the first lens element110, the object-side surface121and the image-side surface122of the second lens element120, the object-side surface131and the image-side surface132of the third lens element130, the object-side surface141and the image-side surface142of the fourth lens element140, and the object-side surface151and the image-side surface152of the fifth lens element150are all defined by the following aspherical formula:

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendicular distance between the point of the aspherical surface at a distance Y from the optical axis and the tangent plane of the vertex on the optical axis of the aspherical surface);

Y represents the perpendicular distance between the point of the aspherical surface and the optical axis;

K represents a conic constant;

a2irepresents an aspherical coefficient of 2ithlevel.

The values of each aspherical parameter are shown inFIG. 5.

As illustrated inFIG. 3, longitudinal spherical aberration (a), in view of the vertical deviation of each curve, the offset of the off-axis light relative to the image point is within ±0.02 mm. Therefore, the present embodiment improves the longitudinal spherical aberration with respect to different wavelengths.

Please refer toFIG. 3, astigmatism aberration in the sagittal direction (b) and astigmatism aberration in the tangential direction (c). The focus variation with respect to the three wavelengths in the whole field falls within ±0.08 mm. This reflects the optical imaging lens1of the present embodiment eliminates aberration effectively.

Please refer toFIG. 3, distortion aberration (d), which shows the variation of the distortion aberration is within ±2%. Such distortion aberration meets the requirement of acceptable image quality and shows the optical imaging lens1of the present embodiment could restrict the distortion aberration to raise the image quality even though the length of the optical imaging lens1is shortened to 3.77 mm.

Therefore, the optical imaging lens1of the present embodiment shows great characteristics in the longitudinal spherical aberration, astigmatism in the sagittal direction, astigmatism in the tangential direction, and distortion aberration. According to the above illustration, the optical imaging lens1of the example embodiment indeed achieves great optical performance and the length of the optical imaging lens1is effectively shortened.

Reference is now made toFIGS. 6-9.FIG. 6illustrates an example cross-sectional view of an optical imaging lens2having five lens elements of the optical imaging lens according to a second example embodiment.FIG. 7shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens2according to the second example embodiment.FIG. 8shows an example table of optical data of each lens element of the optical imaging lens2according to the second example embodiment.FIG. 9shows an example table of aspherical data of the optical imaging lens2according to the second example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 2, for example, reference number231for labeling the object-side surface of the third lens element230, reference number232for labeling the image-side surface of the third lens element230, etc.

As shown inFIG. 6, the optical imaging lens2of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop200, the first lens element210, a second lens element220, a third lens element230, a fourth lens element240and a fifth lens element250.

The differences between the second embodiment and the first embodiment are the radius of curvature and thickness of each lens element, the distance of each air gap and the surface shape of the object-side surface231and the image-side surface242, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements210,220,230,240and250and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces211,221,241,251facing to the object side A1 and the image-side surfaces212,222,232,252facing to the image side A2, are similar to those in the first embodiment. Specifically, the object-side surface221of the second lens element220is a concave surface and the image-side surface232of the third lens element230is a convex surface comprising a convex portion2321in a vicinity of the optical axis. Please refer toFIG. 8for the optical characteristics of each lens elements in the optical imaging lens2of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface211of the first lens element210to the image plane270along the optical axis is 4.45 mm and the length of the optical imaging lens2is shortened.

As shown inFIG. 7, the optical imaging lens2of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens2is effectively shortened.

Reference is now made toFIGS. 10-13.FIG. 10illustrates an example cross-sectional view of an optical imaging lens3having five lens elements of the optical imaging lens according to a third example embodiment.FIG. 11shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens3according to the third example embodiment.FIG. 12shows an example table of optical data of each lens element of the optical imaging lens3according to the third example embodiment.FIG. 13shows an example table of aspherical data of the optical imaging lens3according to the third example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 3, for example, reference number331for labeling the object-side surface of the third lens element330, reference number332for labeling the image-side surface of the third lens element330, etc.

As shown inFIG. 10, the optical imaging lens3of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop300, the first lens element310, a second lens element320, a third lens element330, a fourth lens element340and a fifth lens element350.

The differences between the third embodiment and the first embodiment are the radius of curvature and thickness of each lens element, the distance of each air gap and the surface shape of the object-side surface331, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements310,320,330,340,350and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces311,321,331,341,351facing to the object side A1 and the image-side surfaces312,322,332,342,352facing to the image side A2, are similar to those in the first embodiment. Specifically, the object-side surface331of the third lens element330is a concave surface. Please refer toFIG. 12for the optical characteristics of each lens elements in the optical imaging lens3of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface311of the first lens element310to the image plane370along the optical axis is 3.93 mm and the length of the optical imaging lens3is shortened.

As shown inFIG. 11, the optical imaging lens3of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens3is effectively shortened.

Reference is now made toFIGS. 14-17.FIG. 14illustrates an example cross-sectional view of an optical imaging lens4having five lens elements of the optical imaging lens according to a fourth example embodiment.FIG. 15shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens4according to the fourth embodiment.FIG. 16shows an example table of optical data of each lens element of the optical imaging lens4according to the fourth example embodiment.FIG. 17shows an example table of aspherical data of the optical imaging lens4according to the fourth example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 4, for example, reference number431for labeling the object-side surface of the third lens element430, reference number432for labeling the image-side surface of the third lens element430, etc.

As shown inFIG. 14, the optical imaging lens4of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop400, the first lens element410, a second lens element420, a third lens element430, a fourth lens element440and a fifth lens element450.

The differences between the fourth embodiment and the first embodiment are the radius of curvature and thickness of each lens element and the distance of each air gap, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements410,420,430,440,450and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces411,421,431,441,451facing to the object side A1 and the image-side surfaces412,422,432,442,452facing to the image side A2, are similar to those in the first embodiment. Please refer toFIG. 16for the optical characteristics of each lens elements in the optical imaging lens4of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface411of the first lens element410to the image plane470along the optical axis is 3.93 mm and the length of the optical imaging lens4is shortened.

As shown inFIG. 15, the optical imaging lens4of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens4is effectively shortened.

Reference is now made toFIGS. 18-21.FIG. 18illustrates an example cross-sectional view of an optical imaging lens5having five lens elements of the optical imaging lens according to a fifth example embodiment.FIG. 19shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens5according to the fifth embodiment.FIG. 20shows an example table of optical data of each lens element of the optical imaging lens5according to the fifth example embodiment.FIG. 21shows an example table of aspherical data of the optical imaging lens5according to the fifth example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 5, for example, reference number531for labeling the object-side surface of the third lens element530, reference number532for labeling the image-side surface of the third lens element530, etc.

As shown inFIG. 18, the optical imaging lens5of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop500, the first lens element510, a second lens element520, a third lens element530, a fourth lens element540and a fifth lens element550.

The differences between the fifth embodiment and the first embodiment are the radius of curvature and thickness of each lens element, the distance of each air gap and the surface shape of the object-side surface531, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements510,520,530,540,550and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces511,521,531,541,551facing to the object side A1 and the image-side surfaces512,522,532,542,552facing to the image side A2, are similar to those in the first embodiment. Specifically, the object-side surface531of the third lens element530is a concave surface. Please refer toFIG. 20for the optical characteristics of each lens elements in the optical imaging lens5of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface511of the first lens element510to the image plane570along the optical axis is 3.94 mm and the length of the optical imaging lens5is shortened.

As shown inFIG. 19, the optical imaging lens5of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens5is effectively shortened.

Reference is now made toFIGS. 22-25.FIG. 22illustrates an example cross-sectional view of an optical imaging lens6having five lens elements of the optical imaging lens according to a sixth example embodiment.FIG. 23shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens6according to the sixth embodiment.FIG. 24shows an example table of optical data of each lens element of the optical imaging lens6according to the sixth example embodiment.FIG. 25shows an example table of aspherical data of the optical imaging lens6according to the sixth example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 6, for example, reference number631for labeling the object-side surface of the third lens element630, reference number632for labeling the image-side surface of the third lens element630, etc.

As shown inFIG. 22, the optical imaging lens6of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop600, the first lens element610, a second lens element620, a third lens element630, a fourth lens element640and a fifth lens element650.

The differences between the sixth embodiment and the first embodiment are the radius of curvature and thickness of each lens element, the distance of each air gap and the surface shape of the object-side surface651, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements610,620,630,640,650and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces611,621,631,641,651facing to the object side A1 and the image-side surfaces612,622,632,642,652facing to the image side A2, are similar to those in the first embodiment. Specifically, the object-side surface651of the fifth lens element650comprises a convex portion6511in a vicinity of the optical axis, a convex portion6512in a vicinity of a periphery of the fifth lens element650and a concave portion6513between the vicinity of the optical axis and the vicinity of the periphery of the fifth lens element650. Please refer toFIG. 24for the optical characteristics of each lens elements in the optical imaging lens6of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface611of the first lens element610to the image plane670along the optical axis is 4.03 mm and the length of the optical imaging lens6is shortened.

As shown inFIG. 23, the optical imaging lens6of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens6is effectively shortened.

Reference is now made toFIGS. 26-29.FIG. 26illustrates an example cross-sectional view of an optical imaging lens7having five lens elements of the optical imaging lens according to a seventh example embodiment.FIG. 27shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens7according to the seventh embodiment.FIG. 28shows an example table of optical data of each lens element of the optical imaging lens7according to the seventh example embodiment.FIG. 29shows an example table of aspherical data of the optical imaging lens7according to the seventh example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 7, for example, reference number731for labeling the object-side surface of the third lens element730, reference number732for labeling the image-side surface of the third lens element730, etc.

As shown inFIG. 26, the optical imaging lens7of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop700, the first lens element710, a second lens element720, a third lens element730, a fourth lens element740and a fifth lens element750.

The differences between the seventh embodiment and the first embodiment are the radius of curvature and thickness of each lens element, the distance of each air gap and the surface shape of the object-side surface731, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements710,720,730,740,750and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces711,721,731,741,751facing to the object side A1 and the image-side surfaces712,722,732,742,752facing to the image side A2, are similar to those in the first embodiment. Specifically, the object-side surface731of the third lens element730is a concave surface. Please refer toFIG. 28for the optical characteristics of each lens elements in the optical imaging lens7of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface711of the first lens element710to the image plane770along the optical axis is 3.99 mm and the length of the optical imaging lens7is shortened.

As shown inFIG. 27, the optical imaging lens7of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens7is effectively shortened.

Reference is now made toFIGS. 30-33.FIG. 30illustrates an example cross-sectional view of an optical imaging lens8having five lens elements of the optical imaging lens according to a eighth example embodiment.FIG. 31shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens8according to the eighth embodiment.FIG. 32shows an example table of optical data of each lens element of the optical imaging lens8according to the eighth example embodiment.FIG. 33shows an example table of aspherical data of the optical imaging lens8according to the eighth example embodiment. The reference numbers labeled in the present embodiment are similar to those in the first embodiment for the similar elements, but here the reference numbers are initialed with 8, for example, reference number831for labeling the object-side surface of the third lens element830, reference number832for labeling the image-side surface of the third lens element830, etc.

As shown inFIG. 30, the optical imaging lens8of the present embodiment, in an order from an object side A1 to an image side A2 along an optical axis, comprises an aperture stop800, the first lens element810, a second lens element820, a third lens element830, a fourth lens element840and a fifth lens element850.

The differences between the eighth embodiment and the first embodiment are the radius of curvature and thickness of each lens element, the distance of each air gap and the surface shape of the object-side surface831, but the configuration of the positive/negative refracting power of the first, second, third, fourth and fifth lens elements810,820,830,840,850and configuration of the concave/convex shape of surfaces, comprising the object-side surfaces811,821,831,841,851facing to the object side A1 and the image-side surfaces812,822,832,842,852facing to the image side A2, are similar to those in the first embodiment. Specifically, the object-side surface831of the third lens element830is a concave surface. Please refer toFIG. 32for the optical characteristics of each lens elements in the optical imaging lens8of the present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

wherein the distance from the object-side surface811of the first lens element810to the image plane870along the optical axis is 3.95 mm and the length of the optical imaging lens8is shortened.

As shown inFIG. 31, the optical imaging lens8of the present embodiment shows great characteristics in longitudinal spherical aberration (a), astigmatism in the sagittal direction (b), astigmatism in the tangential direction (c), and distortion aberration (d). Therefore, according to the above illustration, the optical imaging lens of the present embodiment indeed shows great optical performance and the length of the optical imaging lens8is effectively shortened.

Reference is now made toFIG. 35, which illustrates an example structural view of a first embodiment of mobile device20applying an aforesaid optical imaging lens. The mobile device20comprises a housing21and a photography module22positioned in the housing21. Examples of the mobile device20may be, but are not limited to, a mobile phone, a camera, a tablet computer, a personal digital assistant (PDA), etc.

As shown inFIG. 35, the photography module22may comprise an aforesaid optical imaging lens with five lens elements, for example, the optical imaging lens1of the first embodiment, a lens barrel23for positioning the optical imaging lens1, a module housing unit24for positioning the lens barrel23, a substrate172for positioning the module housing unit24, and an image sensor171which is positioned at an image side of the optical imaging lens1. The image plane170is formed on the image sensor171.

In some other example embodiments, the structure of the filtering unit160may be omitted. In some example embodiments, the housing21, the lens barrel23, and/or the module housing unit24may be integrated into a single component or assembled by multiple components. In some example embodiments, the image sensor171used in the present embodiment is directly attached to a substrate172in the form of a chip on board (COB) package, and such package is different from traditional chip scale packages (CSP) since a COB package does not require a cover glass before the image sensor171in the optical imaging lens1. Aforesaid exemplary embodiments are not limited to this package type and could be selectively incorporated in other described embodiments.

The five lens elements110,120,130,140,150are positioned in the lens barrel23in the way of separated by an air gap between any two adjacent lens elements.

The module housing unit24comprises a lens backseat2401for positioning the lens barrel23and an image sensor base2406positioned between the lens backseat2401and the image sensor171. The lens barrel23and the lens backseat2401are positioned along a same axis I-I′, and the lens backseat2401is close to the outside of the lens barrel23. The image sensor base2406is exemplarily close to the lens backseat2401here. The image sensor base2406could be optionally omitted in some other embodiments of the present invention.

Because the length of the optical imaging lens1is merely 3.77 mm, the size of the mobile device20may be quite small. Therefore, the embodiments described herein meet the market demand for smaller sized product designs.

Reference is now made toFIG. 36, which shows another structural view of a second embodiment of mobile device20′ applying the aforesaid optical imaging lens1. One difference between the mobile device20′ and the mobile device20may be the lens backseat2401comprising a first seat unit2402, a second seat unit2403, a coil2404and a magnetic unit2405. The first seat unit2402is close to the outside of the lens barrel23, and positioned along an axis I-I′, and the second seat unit2403is around the outside of the first seat unit2402and positioned along with the axis I-I′. The coil2404is positioned between the first seat unit2402and the inside of the second seat unit2403. The magnetic unit2405is positioned between the outside of the coil2404and the inside of the second seat unit2403.

The lens barrel23and the optical imaging lens1positioned therein are driven by the first seat unit2402for moving along the axis I-I′. The rest structure of the mobile device20′ is similar to the mobile device20.

Similarly, because the length of the optical imaging lens1, 3.77 mm, is shortened, the mobile device20′ can be designed with a smaller size while still maintaining good optical performance. Therefore, the present embodiment meets the demand of a small sized product design and the request of the market.

According to the above illustration, it is clear that the mobile device and the optical imaging lens thereof in example embodiments, through controlling the detail structure and/or reflection power of the lens elements, the length of the optical imaging lens is effectively shortened and good optical characteristics are still provided.