Optical imaging lens

Present embodiments provide for an optical imaging lens. The optical imaging lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and enlarge field angle the total length of the optical imaging lens is shortened.

RELATED APPLICATIONS

This application claims priority from China Patent Application No. 201610252412.3, filed on Apr. 21, 2016 and China Patent Application No. 201610352292.4, filed on May 25, 2016, the contents of which are hereby incorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, and particularly, to an optical imaging lens having six lens elements.

BACKGROUND

Technology improves every day, continuously expanding consumer demand for increasingly compact electronic devices. This applies in the context of telephoto lens characteristics, in that key components for optical imaging lenses incorporated into consumer electronic products should keep pace with technological improvements in order to meet the expectations of consumers expectations. Some important characteristics of an optical imaging lens include image quality and size. Improvements in image sensor technology play an important role in raising consumer expectations related to image quality. However, reducing the size of the imaging lens while achieving good optical characteristics presents challenging problems. For example, in a typical optical imaging lens system having six lens elements, the distance from the object side surface of the first lens element to the image plane along the optical axis is too large to accommodate the slim profile of today's cell phones or digital cameras.

Decreasing the dimensions of an optical lens while maintaining good optical performance may not only be achieved by scaling down the lens. Rather, these benefits may be realized by improving other aspects of the design process, such as by varying the material used for the lens, or adjusting the assembly yield.

In this manner, there is a continuing need for improving the design characteristics of small sized optical lenses. Achieving these advancements may require overcoming unique challenges, even when compared to design improvements for traditional optical lenses. However, refining aspects of the optical lens manufacturing process that result in a lens that meets consumer demand and provides upgrades to imaging quality are always desirable objectives for industries, governments, and academia.

SUMMARY

The present disclosure provides for an optical imaging lens. By controlling the convex or concave shape of the surfaces of each lens element and the parameters in at least two equations, the length of the optical imaging lens may be shortened while maintaining good optical characteristics and system functionality.

In some embodiments, an optical imaging lens may comprise sequentially from an object side to an image side along an optical axis, an aperture stop, a first, second, third, fourth, fifth and sixth lens elements, and a filtering unit. Each of the first, second, third, fourth, fifth and sixth lens elements have varying refracting power in some embodiments. Additionally, some embodiments further comprise an object-side surface facing toward the object side, an image-side surface facing toward the image side, and a central thickness defined along the optical axis.

In the specification, parameters used herein may include:

Param-eterDefinitionT1The central thickness of the first lens element along the opticalaxisG12The distance between the image-side surface of the first lenselement and the object-side surface of the second lens elementalong the optical axis/The air gap between the first lenselement and the second lens element along the optical axisT2The central thickness of the second lens element along theoptical axisG23The air gap between the second lens element and the third lenselement along the optical axisT3The central thickness of the third lens element along the opticalaxisG34The air gap between the third lens element and the fourth lenselement along the optical axisT4The central thickness of the fourth lens element along theoptical axisG45The air gap between the fourth lens element and the fifth lenselement along the optical axisT5The central thickness of the fifth lens element along the opticalaxisG56The air gap between the fifth lens element and the sixth lenselement along the optical axisT6The central thickness of the sixth lens element along the opticalaxisG6FThe distance between the image-side surface of the sixth lenselement and the object-side surface of the filtering unit alongthe optical axisTFThe central thickness of the filtering unit along the opticalaxisGFPThe distance between the image-side surface of the filteringunit and an image plane along the optical axisf1The focusing length of the first lens elementf2The focusing length of the second lens elementf3The focusing length of the third lens elementf4The focusing length of the fourth lens elementf5The focusing length of the fifth lens elementf6The focusing length of the sixth lens elementn1The refracting index of the first lens elementn2The refracting index of the second lens elementn3The refracting index of the third lens elementn4The refracting index of the fourth lens elementn5The refracting index of the fifth lens elementn6The refracting index of the sixth lens elementv1The Abbe number of the first lens elementv2The Abbe number of the second lens elementv3The Abbe number of the third lens elementv4The Abbe number of the fourth lens elementv5The Abbe number of the fifth lens elementv6The Abbe number of the sixth lens elementHFOVHalf Field of View of the optical imaging lensFnoF-number of the optical imaging lensEFLThe effective focal length of the optical imaging lensTTLThe distance between the object-side surface of the first lenselement and an image plane along the optical axis/The lengthof the optical image lensALTThe sum of the central thicknesses of all lens elementsGaaThe sum of all air gaps between all lens elements along theoptical axisBFLThe back focal length of the optical imaging lens/The distancefrom the image-side surface of the last lens element to theimage plane along the optical axisTLThe distance from the object-side surface of the first lenselement to the image-side surface of the lens element adjacentto the image plane along the optical axisGmaxThe maximum value of the air gaps between two adjacent lenselements of the first lens element to the sixth lens element

According to some embodiments of the optical imaging lens of the present disclosure, the image-side surface of the first lens element may comprise a concave portion in a vicinity of a periphery of the first lens element; the image-side surface of the second lens element may comprise a concave portion in a vicinity of a periphery of the second lens element; the material of the third lens element may be plastic; the material of the fourth lens element may be plastic; the material of the fifth lens element may be plastic; the material of the sixth lens element may be plastic; and the optical imaging lens may comprise no other lenses having refracting power beyond the six lens elements.

In another exemplary embodiment, other equation(s), such as those relating to the ratio among parameters could be taken into consideration. For example, EFL and TTL could be controlled to satisfy the equation as follows:
1≦EFL/TTL  Equation (1); and
TTL could be controlled to satisfy the equation as follows:
TTL≦18 mm  Equation (2).

Alternatively, other parameters could be taken into consideration. For example: T4 and T6 could be controlled to satisfy the equation as follows:
T4/T6≦1.8  Equation (3);
BFL and T3 could be controlled to satisfy the equation as follows:
BFL/T3≦2.8  Equation (4);
BFL and T6 could be controlled to satisfy the equation as follows:
BFL/T6≦2.8  Equation (5);
TTL and T3 could be controlled to satisfy the equation as follows:
TTL/T3≦17.9  Equation (6);
G34 and T4 could be controlled to satisfy the equation as follows:
T4/G34≦1.4  Equation (7);
T5 and G34 could be controlled to satisfy the equation as follows:
T5/G34≦1.8  Equation (8);
ALT and T6 could be controlled to satisfy the equation as follows:
ALT/T6≦9.3  Equation (9);
TTL and T6 could be controlled to satisfy the equation as follows:
TTL/T6≦17.9  Equation (10);
Gaa and T3 could be controlled to satisfy the equation as follows:
Gaa/T3≦5.8  Equation (11);
T1 and T3 could be controlled to satisfy the equation as follows:
T1/T3≦2.4  Equation (12);
Gaa and T6 could be controlled to satisfy the equation as follows:
Gaa/T6≦5.8  Equation (13);
T1 and T6 could be controlled to satisfy the equation as follows:
T1/T6≦2.4  Equation (14);
BFL and G34 could be controlled to satisfy the equation as follows:
BFL/G34≦2.2  Equation (15);
ALT and G34 could be controlled to satisfy the equation as follows:
ALT/G34≦7.3  Equation (16);
TTL and G34 could be controlled to satisfy the equation as follows:
TTL/G34≦13.9  Equation (17);
Gaa and G34 could be controlled to satisfy the equation as follows:
Gaa/G34≦4.5  Equation (18);
ALT and T3 could be controlled to satisfy the equation as follows:
ALT/T3≦5.7  Equation (19);
ALT and T1 could be controlled to satisfy the equation as follows:
ALT/T1≦3.7  Equation (20); or
TTL and T1 could be controlled to satisfy the equation as follows:
TTL/T1≦7.3  Equation (21).

The aforesaid parameters and equations are not limited to particular embodiments, and could be selectively incorporated in other embodiments described herein. In some embodiments, more details about the convex or concave surface structure 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. It is further noted that the details listed herein could be incorporated into other example embodiments if no inconsistency occurs.

By controlling the convex or concave shape of the surfaces, exemplary embodiments of the optical imaging lens systems herein achieve good optical characteristics, provide an enlarged aperture, reduce the field of view, increase assembly yield, 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 disclosure. 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 disclosure. 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.

In the present specification, the description “a lens element having positive refracting power (or negative refractive power)” means that the paraxial refractive power of the lens element in Gaussian optics is positive (or negative). The description “An object-side (or image-side) surface of a lens element” may include a specific region of that surface of the lens element where imaging rays are capable of passing through that region, namely the clear aperture of the surface. The aforementioned imaging rays can be classified into two types, chief ray Lc and marginal ray Lm. Taking a lens element depicted inFIG. 1as an example, the lens element may be rotationally symmetric, where the optical axis I is the axis of symmetry. The region A of the lens element is defined as “a part in a vicinity of the optical axis”, and the region C of the lens element is defined as “a part in a vicinity of a periphery of the lens element”. Besides, the lens element may also have an extending part E extended radially and outwardly from the region C, namely the part outside of the clear aperture of the lens element. The extending part E may be used for physically assembling the lens element into an optical imaging lens system. Under normal circumstances, the imaging rays would not pass through the extending part E because those imaging rays only pass through the clear aperture. The structures and shapes of the aforementioned extending part E are only examples for technical explanation, the structures and shapes of lens elements should not be limited to these examples. Note that the extending parts of the lens element surfaces depicted in the following embodiments are partially omitted.

The following criteria are provided for determining the shapes and the parts of lens element surfaces set forth in the present specification. These criteria mainly determine the boundaries of parts under various circumstances including the part in a vicinity of the optical axis, the part in a vicinity of a periphery of a lens element surface, and other types of lens element surfaces such as those having multiple parts.

FIG. 1depicts a radial cross-sectional view of a lens element. Before determining boundaries of those aforesaid parts, two referential points should be defined first, the central point and the transition point. The central point of a surface of a lens element is a point of intersection of that surface and the optical axis. The transition point is a point on a surface of a lens element, where the tangent line of that point is perpendicular to the optical axis. Additionally, if multiple transition points appear on one single surface, then these transition points are sequentially named along the radial direction of the surface with numbers starting from the first transition point. For instance, the first transition point (closest one to the optical axis), the second transition point, and the Nth transition point (farthest one to the optical axis within the scope of the clear aperture of the surface). The part of a surface of the lens element between the central point and the first transition point is defined as the part in a vicinity of the optical axis. The part located radially outside of the Nth transition point (but still within the scope of the clear aperture) is defined as the part in a vicinity of a periphery of the lens element. In some embodiments, there are other parts existing between the part in a vicinity of the optical axis and the part in a vicinity of a periphery of the lens element; the numbers of parts depend on the numbers of the transition point(s). In addition, the radius of the clear aperture (or a so-called effective radius) of a surface is defined as the radial distance from the optical axis I to a point of intersection of the marginal ray Lm and the surface of the lens element.

Referring toFIG. 2, determining the shape of a part is convex or concave depends on whether a collimated ray passing through that part converges or diverges. That is, while applying a collimated ray to a part to be determined in terms of shape, the collimated ray passing through that part will be bended and the ray itself or its extension line will eventually meet the optical axis. The shape of that part can be determined by whether the ray or its extension line meets (intersects) the optical axis (focal point) at the object-side or image-side. For instance, if the ray itself intersects the optical axis at the image side of the lens element after passing through a part, i.e. the focal point of this ray is at the image side (see point R inFIG. 2), the part will be determined as having a convex shape. On the contrary, if the ray diverges after passing through a part, the extension line of the ray intersects the optical axis at the object side of the lens element, i.e. the focal point of the ray is at the object side (see point M inFIG. 2), that part will be determined as having a concave shape. Therefore, referring toFIG. 2, the part between the central point and the first transition point may have a convex shape, the part located radially outside of the first transition point may have a concave shape, and the first transition point is the point where the part having a convex shape changes to the part having a concave shape, namely the border of two adjacent parts. Alternatively, there is another method to determine whether a part in a vicinity of the optical axis may have a convex or concave shape by referring to the sign of an “R” value, which is the (paraxial) radius of curvature of a lens surface. The R value may be used in conventional optical design software such as Zemax and CodeV. The R value usually appears in the lens data sheet in the software. For an object-side surface, positive R means that the object-side surface is convex, and negative R means that the object-side surface is concave. Conversely, for an image-side surface, positive R means that the image-side surface is concave, and negative R means that the image-side surface is convex. The result found by using this method should be consistent as by using the other way mentioned above, which determines surface shapes by referring to whether the focal point of a collimated ray is at the object side or the image side.

For none transition point cases, the part in a vicinity of the optical axis may be defined as the part between 0-50% of the effective radius (radius of the clear aperture) of the surface, whereas the part in a vicinity of a periphery of the lens element may be defined as the part between 50-100% of effective radius (radius of the clear aperture) of the surface.

Referring to the first example depicted inFIG. 3, only one transition point, namely a first transition point, appears within the clear aperture of the image-side surface of the lens element. Part I may be a part in a vicinity of the optical axis, and part II may be a part in a vicinity of a periphery of the lens element. The part in a vicinity of the optical axis may be determined as having a concave surface due to the R value at the image-side surface of the lens element is positive. The shape of the part in a vicinity of a periphery of the lens element may be different from that of the radially inner adjacent part, i.e. the shape of the part in a vicinity of a periphery of the lens element may be different from the shape of the part in a vicinity of the optical axis; the part in a vicinity of a periphery of the lens element may have a convex shape.

Referring to the second example depicted inFIG. 4, a first transition point and a second transition point may exist on the object-side surface (within the clear aperture) of a lens element. In which part I may be the part in a vicinity of the optical axis, and part III may be the part in a vicinity of a periphery of the lens element. The part in a vicinity of the optical axis may have a convex shape because the R value at the object-side surface of the lens element may be positive. The part in a vicinity of a periphery of the lens element (part III) may have a convex shape. What is more, there may be another part having a concave shape existing between the first and second transition point (part II).

Referring to a third example depicted inFIG. 5, no transition point may exist on the object-side surface of the lens element. In this case, the part between 0-50% of the effective radius (radius of the clear aperture) may be determined as the part in a vicinity of the optical axis, and the part between 50-100% of the effective radius may be determined as the part in a vicinity of a periphery of the lens element. The part in a vicinity of the optical axis of the object-side surface of the lens element may be determined as having a convex shape due to its positive R value, and the part in a vicinity of a periphery of the lens element may be determined as having a convex shape as well.

In the present disclosure, various examples of optical imaging lenses are provided, including examples in which the optical imaging lens is a prime lens. Example embodiments of optical imaging lenses may comprise, sequentially from an object side to an image side along an optical axis, a first, second, third, fourth, fifth and sixth lens elements and a filter unit, in which each of said lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The optical imaging lens of the present disclosure achieves good optical characteristics and provides a shortened length due to the design characteristics of each lens element.

The optical imaging lens may include variations of any of the above mentioned characteristics, and the system may vary one or more lens elements. In addition, the system may include variations of additional optical features as well as variations of the optical lens length of the optical imaging lens. For example, the first lens element may have positive refracting power, which is favorable to gather light; the object-side surface of the second lens element may comprise a convex portion in a vicinity of a periphery of the second lens element and the object-side surface of the third lens element may comprise a convex portion in a vicinity of a periphery of the third lens element, which is favorable to gather edge image light; the object-side surface of the sixth lens element may comprise a concave portion in a vicinity of a periphery of the sixth lens element and the image-side surface may comprise a convex portion in a vicinity of a periphery of the sixth lens element. The above mentioned designs may effectively eliminate aberrations, reduce the length of the optical lens, and enhance imaging quality and telephoto characteristics, to provide a more clear image of a local portion of the object.

In addition, controlling the parameters of each lens element as described herein may beneficially provide a designer with the flexibility to design an optical imaging lens with good optical performance, shortened length, enhanced telephoto characteristics, and technological feasibility.

For example, lengthening EFL may reduce the field of view for telephoto characteristics. However, the optical imaging lens used in many cell phones today involves miniaturized dimensions that may affect the lengthening range of the EFL. In view of the above, satisfying any one of the following equations may result in decreasing the thickness of the system. Furthermore, the field of view may be reduced and at least one of the following telephoto characteristics may be satisfied:
1≦EFL/TTL  Equation (1).

Furthermore, in some embodiments, the value of EFL/TTL may be further restricted between 1.00 and 1.50.

Properly decreasing the thicknesses of the lens elements as well as the air gaps between the lens elements serves to shorten the length of the optical imaging lens and allow for the system to focus more easily, which raises image quality. In this manner, the thicknesses of the lens elements and the air gaps between the lens elements may be adjusted to satisfy any one of equations described below, to result in arrangements that overcome the difficulties of providing improved imaging quality while overcoming the previously described difficulties related to assembling the optical lens system:
T4/T6≦1.8  Equation (3);
BFL/T3≦2.8  Equation (4);
BFL/T6≦2.8  Equation (5);
T4/G34≦1.4  Equation (7);
T5/G34≦1.8  Equation (8);
ALT/T6≦9.3  Equation (9);
Gaa/T3≦5.8  Equation (11);
T1/T3≦2.4  Equation (12);
Gaa/T6≦5.8  Equation (13);
T1/T6≦2.4  Equation (14);
BFL/G34≦2.2  Equation (15);
ALT/G34≦7.3  Equation (16);
Gaa/G34≦4.5  Equation (18);
ALT/T3≦5.7  Equation (19); and
ALT/T1≦3.7  Equation (20).

When the design of the optical imaging lens could satisfy any one of Equations (3), (4), (5), (7), (8), (9), (11), (12), (13), (14), (15), (16), (18), (19) and (20), and the denominators of theses equations are fixed, the numerators could be reduced to reduce the volume of the optical imaging lens.

In some embodiments, the value of T4/T6 may be further restricted between 0.3 and 1.8. In some embodiments, the value of BFL/T3 may be further restricted between 0.70 and 2.8. In some embodiments, the value of BFL/T6 may be further restricted between 1.00 and 2.8. In some embodiments, the value of T4/G34 may be further restricted between 0.10 and 1.4. In some embodiments, the value of T5/G34 may be further restricted between 0.20 and 1.8. In some embodiments, the value of ALT/T6 may be further restricted between 3.4 and 9.3. In some embodiments, the value of Gaa/T3 may be further restricted between 1.7 and 5.8. In some embodiments, the value of T1/T3 may be further restricted between 1.00 and 2.40. In some embodiments, the value of Gaa/T6 may be further restricted between 1.00 and 5.80. In some embodiments, the value of T1/T6 may be further restricted between 0.60 and 2.40. In some embodiments, the value of BFL/G34 may be further restricted between 0.60 and 2.20. In some embodiments, the value of ALT/G34 may be further restricted between 3.20 and 7.30. In some embodiments, the value of Gaa/G34 may be further restricted between 2.20 and 4.50. In some embodiments, the value of ALT/T3 may be further restricted between 3.50 and 5.70. In some embodiments, the value of ALT/T1 may be further restricted between 2.20 and 3.70.

In addition, the parameters set forth in the present disclosure could be varied to satisfy any one of equations below, such that the optical imaging lens could be in proper arrangement and have good image quality:
TTL/T3≦17.9  Equation (6);
TTL/T6≦17.9  Equation (10);
TTL/G34≦13.9  Equation (17); and
TTL/T1≦7.3  Equation (21).

In some embodiments, the value of TTL/T3 may be further restricted between 6.6 and 17.9. In some embodiments, the value of TTL/T6 may be further restricted between 5.4 and 17.9. In some embodiments, the value of TTL/G34 may be further restricted between 6.5 and 13.9. In some embodiments, the value of TTL/T1 may be further restricted between 5.3 and 7.3.

Moreover, designing the optical imaging lens to additionally satisfy the equation HFOV≦25°, advantageously improves imaging in applications where uniform light of the image has an impact upon imaging quality. Furthermore, satisfying the HFOV criteria reduces difficulties related to designing and processing the optical image lens.

It should be appreciated that numerous variations are possible when considering improvements to the design of an optical system. When the optical imaging lens of the present disclosure satisfies at least one of the equations described above, the length of the optical lens may be reduced, the aperture stop may be enlarged (F-number may be reduced), the field angle may be reduced, the imaging quality may be enhanced, or the assembly yield may be upgraded. Such characteristics may advantageously mitigate various drawbacks in other optical system designs.

When implementing example embodiments, more details about the convex or concave surface 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. 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 to illustrate non-limiting examples of optical imaging lens systems having good optical characteristics and a shortened length. Reference is now made toFIGS. 6-9.FIG. 6illustrates an example cross-sectional view of an optical imaging lens1having six lens elements according to a first example embodiment.FIG. 7shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens1according to the first example embodiment.FIG. 8illustrates an example table of optical data of each lens element of the optical imaging lens1according to the first example embodiment.FIG. 9depicts an example table of aspherical data of the optical imaging lens1according to the first example embodiment.

As shown inFIG. 6, the optical imaging lens1of the present embodiment may comprise, in order from an object side A1to an image side A2along an optical axis, an aperture stop100, a first lens element110, a second lens element120, a third lens element130, a fourth lens element140, a fifth lens element150and a sixth lens element160. A filtering unit170and an image plane180of an image sensor (not shown) are positioned at the image side A2of the optical imaging lens1. Each of the first, second, third, fourth, fifth and sixth lens elements110,120,130,140,150,160and the filtering unit170may comprise an object-side surface111/121/131/141/151/161/171facing toward the object side A1and an image-side surface112/122/132/142/152/162/172facing toward the image side A2. The example embodiment of the filtering unit170illustrated is an IR cut filter (infrared cut filter) positioned between the sixth lens element160and an image plane180. The filtering unit170selectively absorbs light passing optical imaging lens1that has a specific wavelength. For example, if IR light is absorbed, IR light which is not seen by human eyes is prohibited from producing an image on the image plane180.

Exemplary embodiments of each lens element of the optical imaging lens1will now be described with reference to the drawings. The lens elements of the optical imaging lens1are constructed using plastic material, in some embodiments.

An example embodiment of the first lens element110may have positive refracting power. The object-side surface111may comprise a convex portion1111in a vicinity of an optical axis and a convex portion1112in a vicinity of a periphery of the first lens element110. The image-side surface112may comprise a concave portion1121in a vicinity of the optical axis and a concave portion1122in a vicinity of a periphery of the first lens element110. The object-side surface111and the image-side surface112may be aspherical surfaces.

An example embodiment of the second lens element120may have negative refracting power. The object-side surface121may comprise a concave portion1211in a vicinity of the optical axis and a convex portion1212in a vicinity of a periphery of the second lens element120. The image-side surface122may comprise a concave portion1221in a vicinity of the optical axis and a concave portion1222in a vicinity of a periphery of the second lens element120. The object-side surface121and the image-side surface122may be aspherical surfaces.

An example embodiment of the third lens element130may have positive refracting power. The object-side surface131may comprise a convex portion1311in a vicinity of the optical axis and a convex portion1312in a vicinity of a periphery of the third lens element130. The image-side surface132may comprise a concave portion1321in a vicinity of the optical axis and a concave portion1322in a vicinity of a periphery of the third lens element130. The object-side surface131and the image-side surface132may be aspherical surfaces.

An example embodiment of the fourth lens element140may have positive refracting power. The object-side surface141may comprise a convex portion1411in a vicinity of the optical axis and a concave portion1412in a vicinity of a periphery of the fourth lens element140. The image-side surface142may comprise a concave portion1421in a vicinity of the optical axis and a convex portion1422in a vicinity of a periphery of the fourth lens element140. The object-side surface141and the image-side surface142may be aspherical surfaces.

An example embodiment of the fifth lens element150may have negative refracting power. The object-side surface151may comprise a concave portion1511in a vicinity of the optical axis and a concave portion1512in a vicinity of a periphery of the fifth lens element150. The image-side surface152may comprise a concave portion1521in a vicinity of the optical axis and a convex portion1522in a vicinity of a periphery of the fifth lens element150. The object-side surface151and the image-side surface152may be aspherical surfaces.

An example embodiment of the sixth lens element160may have negative refracting power. The object-side surface161may comprise a concave portion1611in a vicinity of the optical axis and a concave portion1612in a vicinity of a periphery of the sixth lens element160. The image-side surface162may comprise a concave portion1621in a vicinity of the optical axis and a convex portion1622in a vicinity of a periphery of the sixth lens element160. The object-side surface161and the image-side surface162may be aspherical surfaces.

In example embodiments, air gaps exist between the lens elements110,120,130,140,150, the filtering unit170and the image plane180of the image sensor. For example,FIG. 6illustrates the air gap d1existing between the first lens element110and the second lens element120, the air gap d2existing between the second lens element120and the third lens element130, the air gap d3existing between the third lens element130and the fourth lens element140, the air gap d4existing between the fourth lens element140and the fifth lens element150, the air gap d5existing between the fifth lens element150and the sixth lens element160, the air gap d6existing between the sixth lens element160and the filtering unit170, and the air gap d7existing between the filtering unit170and the image plane180of 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 d1is denoted by G12, the air gap d2is denoted by G23, the air gap d3is denoted by G34, the air gap d4is denoted by G45, the air gap d5is denoted by G56, the air gap d6is denoted by G6F, the air gap d7is denoted by GFP, and the sum of d1, d2, d3, d4and d5is denoted by Gaa.

FIG. 8depicts the optical characteristics of each lens elements in the optical imaging lens1of the present embodiment. The aspherical surfaces including the object-side surface111of the first lens element110, 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, the object-side surface151and the image-side surface152of the fifth lens element150, the object-side surface161and the image-side surface162of the sixth lens element160are all defined by the following aspherical formula (1):

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. 9.

FIG. 7part a shows the longitudinal spherical aberration, wherein the horizontal axis ofFIG. 7part a defines the focus, and the vertical axis ofFIG. 7part a defines the field of view.FIG. 7part b shows the astigmatism aberration in the sagittal direction, wherein the horizontal axis ofFIG. 7part b defines the focus, and the vertical axis ofFIG. 7part b defines the image height.FIG. 7part c shows the astigmatism aberration in the tangential direction, wherein the horizontal axis ofFIG. 7part c defines the focus, and the vertical axis ofFIG. 7part c defines the image height.FIG. 7part d shows the variation of the distortion aberration, wherein the horizontal axis ofFIG. 7part d defines the percentage, and the vertical axis ofFIG. 7part d defines the image height. The three curves with different wavelengths (470 nm, 555 nm, 650 nm) represent that off-axis light with respect to these wavelengths may be focused around an image point. From the vertical deviation of each curve shown inFIG. 7part a, the offset of the off-axis light relative to the image point may be within about ±0.05 mm. Therefore, the first embodiment may improve the longitudinal spherical aberration with respect to different wavelengths. Referring toFIG. 7part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.16 mm. Referring toFIG. 7part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.20 mm. Referring toFIG. 7part d, the horizontal axis ofFIG. 7part d, the variation of the distortion aberration may be within about ±0.25%.

The distance from the object-side surface111of the first lens element110to the image plane180along the optical axis may be about 5.357 mm. In accordance with these values, the present embodiment may provide an optical imaging lens having a shortened length, and may be capable of accommodating a slim product profile that also renders improved optical performance.

Reference is now made toFIGS. 10-13.FIG. 10illustrates an example cross-sectional view of an optical imaging lens2having six lens elements according to a second example embodiment.FIG. 11shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens2according to the second example embodiment.FIG. 12shows an example table of optical data of each lens element of the optical imaging lens2according to the second example embodiment.FIG. 13shows 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. 10, the optical imaging lens2of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop200, a first lens element210, a second lens element220, a third lens element230, a fourth lens element240, a fifth lens element250and a sixth lens element260.

The arrangement of the convex or concave surface structures, including the object-side surfaces211,231,241,251, and261and the image-side surfaces212and222are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens2may include the concave/convex shapes of at least one of the following: the object-side surface221and the image-side surfaces232,242,252,262. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface221may comprise a convex portion2211in a vicinity of the optical axis, the image-side surface232may comprise a convex portion2322in a vicinity of a periphery of the third lens element230, the image-side surface242may comprise a concave portion2422in a vicinity of a periphery of the fourth lens element240, the image-side surface252may comprise a convex portion2521in a vicinity of the optical axis, the image-side surface262may comprise a convex portion2621in a vicinity of the optical axis, the fourth lens element240may have negative refracting power, and the fifth lens element250may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 12for the optical characteristics of each lens element in the optical imaging lens2of the present embodiment.

From the vertical deviation of each curve shown inFIG. 11part a, the offset of the off-axis light relative to the image point may be within about ±0.01 mm. Referring toFIG. 11part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.20 μm. Referring toFIG. 11part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.20 μm. Referring toFIG. 11part d, the variation of the distortion aberration of the optical imaging lens2may be within about ±0.7%.

In comparison with the first embodiment, the second embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Further, the second embodiment may be manufactured more easily and the yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 14-17.FIG. 14illustrates an example cross-sectional view of an optical imaging lens3having six lens elements according to a third example embodiment.FIG. 15shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens3according to the third example embodiment.FIG. 16shows an example table of optical data of each lens element of the optical imaging lens3according to the third example embodiment.FIG. 17shows 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. 14, the optical imaging lens3of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop300, a first lens element310, a second lens element320, a third lens element330, a fourth lens element340, a fifth lens element350and a sixth lens element360.

The arrangement of the convex or concave surface structures, including the object-side surfaces311and331and the image-side surfaces312,322, and352are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens3may include the concave/convex shapes of at least one of the following: the object-side surfaces321,341,351, and361, and the image-side surface332,342, and362. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface321may comprise a convex portion3211in a vicinity of the optical axis, the image-side surface332may comprise a convex portion3322in a vicinity of a periphery of the third lens element330, the object-side surface341may comprise a concave portion3411in a vicinity of the optical axis, the image-side surface342may comprise a convex portion3421in a vicinity of the optical axis and a concave portion3422in a vicinity of a periphery of the fourth lens element340, the object-side surface351may comprise a convex portion3511in a vicinity of the optical axis, the object-side surface361may comprise a convex portion3611in a vicinity of the optical axis, the image-side surface362may comprises a convex portion3621in a vicinity of the optical axis, the fourth lens element340may have negative refracting power, and the sixth lens element360may comprise positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 16for the optical characteristics of each lens element in the optical imaging lens3of the present embodiment.

From the vertical deviation of each curve shown inFIG. 15part a, the offset of the off-axis light relative to the image point may be within about ±0.03 mm. Referring toFIG. 15part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.04 mm. Referring toFIG. 15part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.08 mm. Refer toFIG. 15part d, the variation of the distortion aberration of the optical imaging lens3may be within about ±1.2%.

In comparison with the first embodiment, the third embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Also, the third embodiment may further feature improved image quality in comparison with the first embodiment. Moreover, the third embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 18-21.FIG. 18illustrates an example cross-sectional view of an optical imaging lens4having six lens elements according to a fourth example embodiment.FIG. 19shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens4according to the fourth embodiment.FIG. 20shows an example table of optical data of each lens element of the optical imaging lens4according to the fourth example embodiment.FIG. 21shows 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. 18, the optical imaging lens4of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop400, a first lens element410, a second lens element420, a third lens element430, a fourth lens element440, a fifth lens element450and a sixth lens element460.

The arrangement of the convex or concave surface structures, including the object-side surfaces411,431,441, and461and the image-side surfaces412,422,442,452, and462are generally similar to the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens4may include the concave/convex shapes of at least one of the following: the object-side surfaces421and441, and the image-side surfaces432,442,452, and462. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface421may comprise a convex portion4211in a vicinity of the optical axis, the image-side surface432may comprise a convex portion4322in a vicinity of a periphery of the third lens element430, the object-side surface441may comprise a concave portion4411in a vicinity of the optical axis, the image-side surface442may comprise a concave portion4422in a vicinity of a periphery of the fourth lens element440, the image-side surface452may comprise a convex portion4521in a vicinity of the optical axis, the image-side surface462may comprise a convex portion4621in a vicinity of the optical axis, the fourth lens element440may have negative refracting power, and the fifth lens element450may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 20for the optical characteristics of each lens elements in the optical imaging lens4of the present embodiment.

From the vertical deviation of each curve shown inFIG. 19part a, the offset of the off-axis light relative to the image point may be within about ±0.02 mm. Referring toFIG. 19part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.03 mm. Referring toFIG. 19part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.06 mm. Referring toFIG. 19part d, the variation of the distortion aberration of the optical imaging lens4may be within about ±1.4%.

Additionally, the distance from the object-side surface411of the first lens element410to the image plane480along the optical axis may be about 5.908 mm, EFL may be about 6.141 mm, the image height may be about 2.619 mm, HFOV may be about 22.896 degrees, and Fno may be about 2.29.

In comparison to the first embodiment, the fourth embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Also, the fourth embodiment may further feature improved image quality in comparison with the first embodiment. Moreover, the fourth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 22-25.FIG. 22illustrates an example cross-sectional view of an optical imaging lens5having six lens elements according to a fifth example embodiment.FIG. 23shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens5according to the fifth embodiment.FIG. 24shows an example table of optical data of each lens element of the optical imaging lens5according to the fifth example embodiment.FIG. 25shows 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. 22, the optical imaging lens5of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop500, a first lens element510, a second lens element520, a third lens element530, a fourth lens element540, a fifth lens element550and a sixth lens element560.

The arrangement of the convex or concave surface structures, including the object-side surfaces511,531,551, and561and the image-side surfaces512and522are generally similar to the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens5may include the concave/convex shapes of at least one of the following: the object-side surfaces521and541, and the image-side surfaces532,542,552and562. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface521may comprise a convex portion5211in a vicinity of the optical axis, the image image-side surface532may comprise a convex portion5322in a vicinity of a periphery of the third lens element530, the object-side surface541may comprise a concave portion5411in a vicinity of the optical axis, the image-side surface542may comprises a concave portion5422in a vicinity of a periphery of the fourth lens element540, the image-side surface552may comprise a convex portion5521in a vicinity of the optical axis, the image-side surface562may comprise a convex portion5621in a vicinity of the optical axis, the fourth lens element540may have negative refracting power, and the fifth lens element550may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled.FIG. 24depicts the optical characteristics of each lens elements in the optical imaging lens5of the present embodiment.

From the vertical deviation of each curve shown inFIG. 23part a, the offset of the off-axis light relative to the image point may be within about ±0.016 mm. Referring toFIG. 23part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.06 mm. Referring toFIG. 23part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.1 mm. Referring toFIG. 23part d, the variation of the distortion aberration of the optical imaging lens5may be within about ±1.0%.

In comparison to the first embodiment, the fifth embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Also, the fifth embodiment may further feature improved image quality in comparison with the first embodiment. Moreover, the fifth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 26-29.FIG. 26illustrates an example cross-sectional view of an optical imaging lens6having six lens elements according to a sixth example embodiment.FIG. 27shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens6according to the sixth embodiment.FIG. 28shows an example table of optical data of each lens element of the optical imaging lens6according to the sixth example embodiment.FIG. 29shows 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. 26, the optical imaging lens6of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop600, a first lens element610, a second lens element620, a third lens element630, a fourth lens element640, a fifth lens element650and a sixth lens element660.

The arrangement of the convex or concave surface structures, including the object-side surfaces611,631,641,651, and661and image-side surfaces612,622,632,652, and662are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens6may include the concave/convex shapes of at least one of the following: the object-side surface621, and the image-side surface642. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface621may comprise a convex portion6211in a vicinity of the optical axis, the image-side surface642may comprise a convex portion6422in a vicinity of a periphery of the fourth lens element640, the fourth lens element640may have negative refracting power, and the fifth lens element650may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 28for the optical characteristics of each lens elements in the optical imaging lens6of the present embodiment.

From the vertical deviation of each curve shown inFIG. 27part a, the offset of the off-axis light relative to the image point may be within about ±0.02 mm. Referring toFIG. 27part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.04 mm. Referring toFIG. 27part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.14 mm. Referring toFIG. 27part d, the variation of the distortion aberration of the optical imaging lens6may be within about ±1.4%.

In comparison with the first embodiment, the sixth embodiment may include decreased values related to at least one of the following: the longitudinal spherical aberration, the astigmatism aberration in the sagittal and tangential directions, and HFOV of the sixth embodiment. Also, the sixth embodiment may further feature improved image quality in comparison with the first embodiment. Moreover, the sixth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 30-33.FIG. 30illustrates an example cross-sectional view of an optical imaging lens7having six lens elements according to a seventh example embodiment.FIG. 31shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens7according to the seventh embodiment.FIG. 32shows an example table of optical data of each lens element of the optical imaging lens7according to the seventh example embodiment.FIG. 33shows 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. 30, the optical imaging lens7of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop700, a first lens element710, a second lens element720, a third lens element730, a fourth lens element740, a fifth lens element750and a sixth lens element760.

The arrangement of the convex or concave surface structures, including the object-side surfaces711,731,751, and761and image-side surfaces712,722, and762are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens7may include the concave/convex shapes of at least one of the following: the object-side surfaces721and741, and the image-side surfaces732,742, and752. Additional differences may include refracting power, radius of curvature, thickness, aspherical data, and effective focal length of each lens element. More specifically, the object-side surface721may comprise a convex portion7211in a vicinity of the optical axis, the image-side surface732may comprise a convex portion7322in a vicinity of a periphery of the third lens element730, the object-side surface741may comprise a concave portion7411in a vicinity of the optical axis, the image-side surface742may comprise a concave portion7422in a vicinity of a periphery of the fourth lens element740, the image-side surface752may comprise a concave portion7521in a vicinity of the optical axis, the fourth lens element740may have negative refracting power, and the fifth lens element750may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 32for the optical characteristics of each lens elements in the optical imaging lens7of the present embodiment.

From the vertical deviation of each curve shown inFIG. 31part a, the offset of the off-axis light relative to the image point may be within ±0.014 mm. Referring toFIG. 31part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.035 mm. Referring toFIG. 31part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.05 mm. Referring toFIG. 31part d, the variation of the distortion aberration of the optical imaging lens7may be within ±1.4%.

In comparison to the first embodiment, the seventh embodiment may include improved values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Moreover, the fourth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 34-37.FIG. 34illustrates an example cross-sectional view of an optical imaging lens8having six lens elements according to an eighth example embodiment.FIG. 35shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens8according to the eighth embodiment.FIG. 36shows an example table of optical data of each lens element of the optical imaging lens8according to the eighth example embodiment.FIG. 37shows 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. 34, the optical imaging lens8of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop800, a first lens element810, a second lens element820, a third lens element830, a fourth lens element840, a fifth lens element850and a sixth lens element860.

The arrangement of the convex or concave surface structures, including the object-side surfaces811,831,841,851, and861, and the image-side surfaces812,822,842, and862are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens8may include the concave/convex shapes of at least one of the following: the object-side surface821, and the image-side surfaces832and852. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface821may comprise a concave portion8211in a vicinity of the optical axis, the image-side surface832may comprise a convex portion8322in a vicinity of a periphery of the third lens element830, the image-side surface852may comprise a convex portion8521in a vicinity of the optical axis, the fourth lens element840may have negative refracting power, and the fifth lens element850may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 36for the optical characteristics of each lens elements in the optical imaging lens8of the present embodiment.

From the vertical deviation of each curve shown inFIG. 35part a, the offset of the off-axis light relative to the image point may be within ±0.025 mm. Referring toFIG. 35part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.025 mm. Referring toFIG. 35part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.05 mm. Referring toFIG. 35part d, the variation of the distortion aberration of the optical imaging lens8may be within ±2.5%.

In comparison to the first embodiment, the eighth embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Also, the eighth embodiment may further feature improved image quality in comparison with the first embodiment. Moreover, the eighth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 38-41.FIG. 38illustrates an example cross-sectional view of an optical imaging lens9having six lens elements according to a ninth example embodiment.FIG. 39shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens9according to the ninth embodiment.FIG. 40shows an example table of optical data of each lens element of the optical imaging lens9according to the ninth example embodiment.FIG. 41shows an example table of aspherical data of the optical imaging lens9according to the ninth 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 9, for example, reference number931for labeling the object-side surface of the third lens element930, reference number932for labeling the image-side surface of the third lens element930, etc.

As shown inFIG. 38, the optical imaging lens9of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop900, a first lens element910, a second lens element920, a third lens element930, a fourth lens element940, a fifth lens element950and a sixth lens element960.

The arrangement of the convex or concave surface structures, including the object-side surfaces911,931, and961, and the image-side surfaces912,922, and952are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens9may include the concave/convex shapes of at least one of the following: the object-side surfaces921,941, and951, and the image-side surfaces932,942, and962. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface921may comprise a convex portion9211in a vicinity of the optical axis, the image-side surface932may comprise a convex portion9322in a vicinity of a periphery of the third lens element930, the object-side surface941may comprise a concave portion9411in a vicinity of the optical axis, the image-side surface942may comprise a convex portion9421in a vicinity of the optical axis and a concave portion9422in a vicinity of a periphery of the fourth lens element940, the object-side surface951may comprise a convex portion9511in a vicinity of the optical axis, the image-side surface962may comprise a convex portion9621in a vicinity of the optical axis, the fourth lens element940may have negative refracting power, and the sixth lens element960may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 40for the optical characteristics of each lens elements in the optical imaging lens9of the present embodiment.

From the vertical deviation of each curve shown inFIG. 39part a, the offset of the off-axis light relative to the image point may be within ±0.04 mm. Referring toFIG. 39part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.04 mm. Referring toFIG. 39part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.07 mm. Referring toFIG. 39part d, the variation of the distortion aberration of the optical imaging lens9may be within ±2.5%.

In comparison with the first embodiment, the ninth embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the sagittal and tangential directions, and HFOV. Moreover, the ninth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 42-45.FIG. 42illustrates an example cross-sectional view of an optical imaging lens10having six lens elements according to a tenth example embodiment.FIG. 43shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens10according to the tenth embodiment.FIG. 44shows an example table of optical data of each lens element of the optical imaging lens10according to the tenth example embodiment.FIG. 45shows an example table of aspherical data of the optical imaging lens10according to the tenth 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 10, for example, reference number1031for labeling the object-side surface of the third lens element930, reference number1032for labeling the image-side surface of the third lens element1030, etc.

As shown inFIG. 42, the optical imaging lens10of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop1000, a first lens element1010, a second lens element1020, a third lens element1030, a fourth lens element1040, a fifth lens element1050and a sixth lens element1060.

The arrangement of the convex or concave surface structures, including the object-side surfaces1011,1031,1041,1051, and1061, and the image-side surfaces1012,1022,1032,1042, and1062are generally similar with the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens10may include the concave/convex shapes of at least one of the following: the object-side surface1021, and the image-side surface1052. Additional differences may include the refracting power, a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface1021may comprise a convex portion10211in a vicinity of the optical axis, the image-side surface1052may comprise a convex portion10521in a vicinity of the optical axis, the fourth lens element1040may have negative refracting power, and the fifth lens element1050may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment are labeled. Please refer toFIG. 44for the optical characteristics of each lens elements in the optical imaging lens10of the present embodiment.

From the vertical deviation of each curve shown inFIG. 43part a, the offset of the off-axis light relative to the image point may be within ±0.025 mm. Referring toFIG. 43part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.025 mm. Referring toFIG. 43part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field falls within ±0.025 mm. Referring toFIG. 43part d, the variation of the distortion aberration of the optical imaging lens9may be within ±0.8%.

In comparison with the first embodiment, the tenth embodiment may include decreased values related to at least one of the following: longitudinal spherical aberration, astigmatism aberration in the tangential direction, and HFOV. Moreover, the tenth embodiment may be manufactured more easily and its yield rate may be higher when compared to the first embodiment.

Reference is now made toFIGS. 46-49.FIG. 46illustrates an example cross-sectional view of an optical imaging lens11having six lens elements of the optical imaging lens according to a eleventh example embodiment.FIG. 47shows example charts of longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens11according to the eleventh example embodiment.FIG. 48shows an example table of optical data of each lens element of the optical imaging lens11according to the eleventh example embodiment.FIG. 49shows an example table of aspherical data of the optical imaging lens11according to the eleventh 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 11, for example, reference number1131for labeling the object-side surface of the third lens element1130, reference number1132for labeling the image-side surface of the third lens element1130, etc.

As shown inFIG. 46, the optical imaging lens11of the present embodiment, in an order from an object side A1to an image side A2along an optical axis, may comprise an aperture stop1100, a first lens element1110, a second lens element1120, a third lens element1130, a fourth lens element1140, a fifth lens element1150and a sixth lens element1160.

The arrangement of the convex or concave surface structures, including the object-side surfaces1111′,1131,1151, and1161and image-side surfaces1112′,1122′,1132, and1152are generally the same as the optical imaging lens1. The differences between the optical imaging lens1and the optical imaging lens11may include the concave/convex shapes of at least one of the following: the object-side surfaces1121′ and1141, and the image-side surfaces1142,1162. Additional differences may include the refracting power, a radius of curvature, a refracting power, a thickness, an aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface1121′ may comprise a convex portion11211in a vicinity of the optical axis, the object-side surface1141may comprise a concave portion11411in a vicinity of the optical axis, the image-side surface1142may comprise a convex portion11421in a vicinity of the optical axis, the image-side surface1162may comprise a convex portion11621in a vicinity of the optical axis, and the fifth lens element1150may have positive refracting power.

Here, for clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the tenth embodiment are labeled. Please refer to FIG.48for the optical characteristics of each lens elements in the optical imaging lens11of the present embodiment.

From the vertical deviation of each curve shown inFIG. 47part a, the offset of the off-axis light relative to the image point may be within about ±0.12 mm. Referring toFIG. 47part b, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.2 mm. Referring toFIG. 47part c, the focus variation with respect to the three different wavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within about ±0.25 mm. Referring toFIG. 47part d, the variation of the distortion aberration of the optical imaging lens11may be within about ±2.5%.

In comparison with the first embodiment, the HFOV of the eleventh embodiment may be smaller. Further, the eleventh embodiment may be manufactured more easily and the yield rate may be higher in comparison with the first embodiment.

Please refer to FIG.FIG. 50which shows the values of BFL, Gaa, ALT, EFL/TTL, T4/T6, BFL/T3, BFL/T6, TTL/T3, T4/G34, T5/G34, ALT/T6, TTL/T6, Gaa/T3, T1/T3, Gaa/T6, T1/T6, BFL/G34, ALT/G34, TTL/G34, Gaa/G34, ALT/T3, ALT/T1 and TTL/T1 of the first to eleventh embodiments, and it is clear that the optical imaging lenses of the first to eleventh embodiments may satisfy the Equations (1)-(21).

According to above disclosure, the longitudinal spherical aberration, the astigmatism aberration and the variation of the distortion aberration of each embodiment meet the use requirements of various electronic products which implement an optical imaging lens. Moreover, the off-axis light with respect to 470 nm, 555 nm and 650 nm wavelengths may be focused around an image point, and the offset of the off-axis light for each curve relative to the image point may be controlled to effectively inhibit the longitudinal spherical aberration, the astigmatism aberration and the variation of the distortion aberration. Further, as shown by the imaging quality data provided for each embodiment, the distance between the 470 nm, 555 nm and 650 nm wavelengths may indicate that focusing ability and inhibiting ability for dispersion is provided for different wavelengths.

According to above illustration, the optical imaging lens of the present disclosure may provide an effectively shortened optical imaging lens length while maintaining good optical characteristics, by controlling the structure of the lens elements as well as at least one of the inequalities described herein.