Optical imaging lens

Present embodiments provide for an optical imaging lens. The optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element positioned sequentially from an object side to an image side. Through arrangement of convex or concave surfaces of the five lens elements, the length of the optical imaging lens may be shortened while providing better optical characteristics and imaging quality.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims priority to P.R.C. Patent Application No. 201710293378.9 titled OPTICAL IMAGING LENS, filed Apr. 28, 2017, with the State Intellectual Property Office of the People's Republic of China (SIPO), which is incorporated herein in its entirety.

TECHNICAL FIELD

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

BACKGROUND

Technology for mobile electronic devices is improving constantly and consumers' demands for compact electronic devices haven't decreased. Key components of an optical imaging lens for a consumer electronic product should keep pace with technological improvements in order to meet the expectations of consumers. In addition to good imaging quality and a compact size, an optical imaging lens should preferably have a large field of view and a large aperture size. Consumers demand for imaging quality have increased with continued improvements to optical imaging lenses. Therefore, in addition to maintaining a small size of an optical imaging lens, the optical imaging lens should provide for good imaging quality and performance qualities.

To preserve good imaging quality, the materials of the optical imaging lens and manufacturing yield should be considered when reducing the size of the optical imaging lens. In this manner, there is a desirable objective for satisfying consumers' demands when increasing a good imaging quality.

SUMMARY

The present disclosure provides for an optical imaging lens. By designing the convex and/or concave surfaces of the five lens elements, the amounts of light entering the optical imaging lens may be increased and the size of the optical imaging lens may be decreased.

In the present disclosure, parameters used herein may be chosen from but not limited to parameters listed below:

ParameterDefinitionT1A central thickness of a first lens element alongan optical axisG12An air gap between a first lens element and a secondlens element along an optical axisT2A central thickness of a second lens element alongan optical axisG23An air gap between a second lens element and a thirdlens element along an optical axisT3A central thickness of a third lens element along anoptical axisG34An air gap between a third lens element and a fourthlens element along an optical axisT4A central thickness of a fourth lens element along anoptical axisG45An air gap between a fourth lens element and a fifthlens element along a optical axisT5A central thickness of a fifth lens element along anoptical axisG5FAn air gap between a fifth lens element and afiltering unit along an optical axisTFA central thickness of a filtering unit along anoptical axisGFPAn air gap between a filtering unit and an image planealong an optical axisf1A focusing length of a first lens elementf2A focusing length of a second lens elementf3A focusing length of a third lens elementf4A focusing length of a fourth lens elementf5A focusing length of a fifth lens elementn1A refracting index of a first lens elementn2A refracting index of a second lens elementn3A refracting index of a third lens elementn4A refracting index of a fourth lens elementn5A refracting index of a fifth lens elementv1An Abbe number of a first lens elementv2An Abbe number of a second lens elementv3An Abbe number of a third lens elementv4An Abbe number of a fourth lens elementv5An Abbe number of a fifth lens elementHFOVHalf Field of View of an optical imaging lensFnoF-number of an optical imaging lensEFLAn effective focal length of an optical imaging lensTTLA distance from an object-side surface of a first lenselement to an image plane along an optical axisALTA sum of a central thicknesses from a first lens elementto a fifth lens elementAAGA sum of all air gaps from a first lens element to a fifthlens element along an optical axisBFLA back focal length of an optical imaging lens/A distancefrom an image-side surface of a fifth lens element to animage plane along an optical axisTLA distance from an object-side surface of a first lenselement to an image-side surface of a fifth lens elementalong an optical axis

According to one embodiment of the present disclosure, an optical imaging lens may comprise sequentially from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the first, second, third, fourth, and fifth lens elements may have varying refracting power in some embodiments. Additionally, each of the first, second, third, fourth, and fifth lens elements may 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 an optical axis. Moreover, an image-side surface of a first lens element may comprise a concave portion in a vicinity of the optical axis, the second lens element may have negative refracting power, and the object-side surface of the second lens element may comprise a concave portion in a vicinity of the optical axis, the third lens element may have positive refracting power and the image-side surface of the third lens element may comprise a convex portion in a vicinity of the optical axis and the object-side surface of the third lens element may have a concave portion in a vicinity of a periphery of the third lens element, the fourth lens element may have positive refracting power and the object-side surface of the fourth lens element may comprise a convex portion in a vicinity of a periphery of the fourth lens element, the image-side surface of the fifth lens element may comprise a concave portion in a vicinity of the optical axis; and the optical imaging lens may comprise no other lenses having refracting power beyond the first to the fifth lens elements.

According to one embodiment of the present disclosure, an optical imaging lens may comprise sequentially from an object side to an image side along an optical axis, a first, second, third, fourth, and fifth lens elements. Each of the first, second, third, fourth, and fifth lens elements may have varying refracting power in some embodiments. Additionally, each of the first, second, third, fourth, and fifth lens elements may 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. Moreover, the image-side surface of the first lens element may comprise a concave portion in a vicinity of the optical axis, the object-side surface of the second lens element may comprise a concave portion in a vicinity of the optical axis, the third lens element may have positive refracting power, the object-side surface of the third lens element may comprise a concave portion in a vicinity of a periphery of the third lens element, the image-side surface of the third lens element may comprise a convex portion in a vicinity of the optical axis, the fourth lens element may have positive refracting power and the object-side surface of the fourth lens element may comprise a convex portion in a vicinity of a periphery of the fourth lens element, the image-side surface of the fifth lens element may have 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 optical imaging lens may comprise no other lenses having refracting power beyond the first to the fifth lens elements.

According to one embodiment of the present disclosure, an optical imaging lens may comprise sequentially from an object side to an image side along an optical axis, a first, second, third, fourth, and fifth lens elements. Each of the first, second, third, fourth, and fifth lens elements may have varying refracting power in some embodiments. Additionally, each of the first, second, third, fourth, and fifth lens elements may 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. Moreover, the image-side surface of the first lens element may comprise a concave portion in a vicinity of the optical axis, the object-side surface of the second lens element may comprise a concave portion in a vicinity of the optical axis, the image-side surface of the second lens element may comprise a concave portion in a vicinity of the optical axis, the third lens element may have positive refracting power, and the image-side surface of the third lens element may comprise a convex portion in a vicinity of the optical axis, the fourth lens element may have positive refracting power, the image-side surface of the fifth lens element may comprise concave portion in a vicinity of the optical axis, and the optical imaging lens may comprise no other lenses having refracting power beyond the first to the fifth lens elements and the optical imaging lens satisfies inequalities as follows:
TTL/BFL≤3.900  Inequality (1); and
TL/G12≤10.000  Inequality (2).

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 disclosure, the description “a lens element having positive refracting power (or negative refracting power)” may mean that a paraxial refracting 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, namely a chief ray Lc and a 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 may be defined as “a part in a vicinity of the optical axis,” and the region C of the lens element may be 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 may not pass through the extending part E because those imaging rays may 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 may be partially omitted.

The following criteria are provided for determining the shapes and the parts of lens element surfaces set forth in the present disclosure. 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/or 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 aforementioned portions, two referential points should be defined first, namely a central point CP and a transition point. The central point of a surface of a lens element may be a point of intersection of that surface and the optical axis I. The transition point may be 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 may be sequentially named along the radial direction of the surface with numbers starting from the first transition point. For instance, a first transition point TP1(e.g., a transition point closest one to the optical axis), a second transition point, and a Nth transition point (e.g., a transition point farthest away from the optical axis within the scope of the clear aperture of the surface). The portion of a surface of the lens element between the central point CP and the first transition point TP1may be defined as the portion in a vicinity of the optical axis. The portion located radially outside of the Nth transition point (but still within the scope of the clear aperture) may be defined as the portion in a vicinity of a periphery of the lens element. In some embodiments, there may be other portions existing between the portion in a vicinity of the optical axis and the portion in a vicinity of a periphery of the lens element; the numbers of portions may 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 may be 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 whether the shape of a portion is convex or concave may depend on whether a collimated ray L passing through that portion converges or diverges. That is, while applying a collimated ray L to a portion to be determined in terms of shape, the collimated ray L passing through that portion may be bended and the ray itself or its extension line EL may eventually meet the optical axis I. The shape of that portion may be determined by whether the ray or its extension line EL meets (intersects) the optical axis I (focal point) at the object-side A1or image-side A2. For instance, if the ray itself intersects the optical axis I at the image side A2of the lens element after passing through a portion, (i.e., the focal point of this ray is at the image side A2(see point R inFIG. 2)), the portion may be determined as having a convex shape. On the contrary, if the ray diverges after passing through a portion, 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 portion may be determined as having a concave shape. Therefore, referring toFIG. 2, the portion between the central point CP and the first transition point TP1may have a convex shape, the portion located radially outside of the first transition point may have a concave shape, and the first transition point may be the point where the portion having a convex shape changes to the portion having a concave shape, namely the border of two adjacent portions. Alternatively, there may be another method to determine whether a portion in a vicinity of the optical axis may have a convex or concave shape by referring to the sign of an “R” value, which may be 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 may mean that the object-side surface is convex, and negative R may mean that the object-side surface is concave. Conversely, for an image-side surface, positive R may mean that the image-side surface is concave, and negative R may mean that the image-side surface is convex. The result found by using this method should be consistent with the result found using the other way mentioned above, which may determine surface shapes by referring to whether the focal point of a collimated ray is at the object side or the image side.

Referring to a case where a transition point is absent, a portion in a vicinity of an optical axis may be defined as the portion between 0-50% of an effective radius (radius of the clear aperture) of a surface, whereas a portion in a vicinity of a periphery of the lens element may be defined as the portion between 50-100% of the effective radius (radius of the clear aperture) of the surface.

FIG. 3illustrates a lens element having only one transition point, namely a first transition point within a clear aperture of an image-side surface of the lens element. Portion I may Z1be a portion in a vicinity of the optical axis, and portion II Z2may be a portion in a vicinity of a periphery of the lens element. The portion 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 portion in a vicinity of a periphery of the lens element may be different from that of the radially inner adjacent portion (i.e., the shape of the portion in a vicinity of a periphery of the lens element may be different from the shape of the portion in a vicinity of the optical axis); the portion in a vicinity of a periphery of the lens element may have a convex shape.

FIG. 4illustrates a lens element having a first transition point and a second transition point TP2on an object-side surface (within the clear aperture) of the lens element. Here, portion I Z1may be the portion in a vicinity of the optical axis, and portion III Z3may be the portion in a vicinity of a periphery of the lens element. The portion 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 portion in a vicinity of a periphery of the lens element (portion III) may have a convex shape. What is more, there may be another portion having a concave shape existing between the first and second transition point (portion II).

FIG. 5illustrates a lens element having no transition point on the object-side surface of the lens element. In this case, the portion between 0-50% of the effective radius (radius of the clear aperture) Z1′ may be determined as the portion in a vicinity of the optical axis, and the portion between 50-100% of the effective radius Z2′ may be determined as the portion in a vicinity of a periphery of the lens element. The portion 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 portion in a vicinity of a periphery of the lens element may be determined as having a convex shape as well.

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 while increasing the field of view. Reference is now made toFIGS. 6-9.FIG. 6illustrates an example cross-sectional view of an optical imaging lens1having five 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, and a fifth lens element150. A filtering unit160and an image plane170of an image sensor (not shown) may be positioned at the image side A2of the optical imaging lens1. Each of the first, second, third, fourth, and fifth lens elements110,120,130,140,150and the filtering unit160may comprise an object-side surface111/121/131/141/151/161facing toward the object side A1and an image-side surface112/122/132/142/152/162facing toward the image side A2. The example embodiment of the filtering unit160illustrated may be an IR cut filter (infrared cut filter) positioned between the fifth lens element150and an image plane170. The filtering unit160may selectively absorb 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 may be prohibited from producing an image on the image plane170.

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 lens1may be constructed using plastic materials in this embodiment.

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 convex portion1122in a vicinity of the periphery of the first lens element110.

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 concave 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 convex portion1222in a vicinity of the periphery of the second lens element120.

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 concave portion1312in a vicinity of a periphery of the third lens element130. The image-side surface132may comprise a convex portion1321in a vicinity of the optical axis and a convex portion1322in a vicinity of the periphery of the third lens element130.

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

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

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 element150may all be 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 (i.e., 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; and

airepresents an aspherical coefficient of ithlevel.

Values of each aspherical parameter are shown inFIG. 9.

FIG. 7(a)shows the longitudinal spherical aberration, wherein the horizontal axis ofFIG. 7(a)defines the focus, and wherein the vertical axis ofFIG. 7(a)defines the field of view.FIG. 7(b)shows the astigmatism aberration in the sagittal direction, wherein the horizontal axis ofFIG. 7(b)defines the focus, and wherein the vertical axis ofFIG. 7(b)defines the image height.FIG. 7(c)shows the astigmatism aberration in the tangential direction, wherein the horizontal axis ofFIG. 7(c)defines the focus, and wherein the vertical axis ofFIG. 7(c)defines the image height.FIG. 7(d)shows a variation of the distortion aberration, wherein the horizontal axis ofFIG. 7(d)defines the percentage, and wherein the vertical axis ofFIG. 7(d)defines the image height. The three curves with different wavelengths (470 nm, 555 nm, 650 nm) may 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. 7(a), the offset of the off-axis light relative to the image point may be within about ±0.035 mm. Therefore, the first embodiment may improve the longitudinal spherical aberration with respect to different wavelengths. Referring toFIG. 7(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. 7(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. 7(d), the horizontal axis ofFIG. 7(d), the variation of the distortion aberration may be within about ±2.5%.

The distance from the object-side surface111of the first lens element110to the image plane170along the optical axis (TTL) may be about 9.147 mm, Fno may be about 2.390, and HFOV may be about 14.90 degrees. When the value of Fno is smaller, the size of the aperture stop and the amounts of light entering into the optical imaging lens may be larger. In accordance with these values, the present embodiment may provide an optical imaging lens having a shortened length while maintaining more advantageous amounts of light entering into the optical imaging lens.

Reference is now made toFIGS. 10-13.FIG. 10illustrates an example cross-sectional view of an optical imaging lens2having five 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 may be similar to those in the first embodiment for the similar elements, but here the reference numbers may be initialed with2; for example, reference number231may label the object-side surface of the third lens element230, reference number232may label 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, and a fifth lens element250.

The arrangements of convex or concave surface structures including the object-side surfaces211,221,231,241,251and the image-side surfaces212,222,232,242,252may be generally similar to the optical imaging lens1. Additional differences may include a radius of curvature, a thickness, an aspherical data, and an effective focal length of each lens element.

Here, in the interest of clearly showing the drawings of a particular embodiment, only the surface shapes which are different from that in the first embodiment may be 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. 11(a), the offset of the off-axis light relative to the image point may be within about ±0.04 mm. Referring toFIG. 11(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 ±0.05 mm. Referring toFIG. 11(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. 11(d), the variation of the distortion aberration of the optical imaging lens2may be within about ±2%.

In comparison with the first embodiment, Fno is smaller, HFOV is larger, and imaging quality is better, and the optical imaging lens may be manufactured more easily so that the yield rate may be higher.

Reference is now made toFIGS. 14-17.FIG. 14illustrates an example cross-sectional view of an optical imaging lens3having five 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 may be similar to those in the first embodiment for the similar elements, but here the reference numbers may be initialed with3; for example, reference number331may label the object-side surface of the third lens element330, reference number332may label the image-side surface of the third lens element330, etc.

As shown inFIG. 14, the optical imaging lens3of the third example 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, and a fifth lens element350.

The arrangements of the convex or concave surface structures in the third example embodiment, including the object-side surfaces311,321,331,341,351and the image-side surfaces312,322,342,352may be generally similar to the optical imaging lens1(FIG. 6depicting the first example embodiment), but the differences between the optical imaging lens1and the optical imaging lens3may include the convex or concave surface structure of the image-side surface332. Additional differences may include a radius of curvature, a thickness, aspherical data, and an effective focal length of each lens element. More specifically, the image-side surface332of the third lens element330may comprise a concave portion3322in a vicinity of a periphery of the third lens element330.

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

From the vertical deviation of each curve shown inFIG. 15(a), the offset of the off-axis light relative to the image point may be within about ±0.03 mm. Referring toFIG. 15(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. 15(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. 15(d), the variation of the distortion aberration of the optical imaging lens3may be within about ±2.5%.

In comparison with the first example embodiment, the third example embodiment may have smaller TTL and Fno values, larger HFOV values, improved imaging quality, and the optical imaging lens may be manufactured more easily so that the yield rate is higher.

Reference is now made toFIGS. 18-21.FIG. 18illustrates an example cross-sectional view of an optical imaging lens4having five 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 may be similar to those in the first example embodiment for the similar elements, but here the reference numbers may be initialed with4; for example, reference number431may label the object-side surface of the third lens element430, reference number432may label 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, and a fifth lens element450.

The arrangements of the convex or concave surface structures, including the object-side surfaces411,421,431,441,451and the image-side surfaces412,422,442,452may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens1and the optical imaging lens4may include the convex or concave surface of the image-side surface432. Additional differences may include a radius of curvature, a thickness, aspherical data, and an effective focal length of each lens element. More specifically, the image-side surface432of the third lens element430may comprise a concave portion4322in a vicinity of a periphery of the third lens element430.

Here, in the interest of clearly showing the drawings of a particular embodiment, only the surface shapes which are different from that in the first embodiment may be 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. 19(a), the offset of the off-axis light relative to the image point may be within about ±0.45 mm. Referring toFIG. 19(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 ±0.05 mm. Referring toFIG. 19(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. 19(d), the variation of the distortion aberration of the optical imaging lens4may be within about ±2.5%.

In comparison with the first example embodiment, the fourth example embodiment may have smaller TTL and Fno, larger HFOV, and the optical imaging lens may be manufactured more easily so that the yield rate is higher.

Reference is now made toFIGS. 22-25.FIG. 22illustrates an example cross-sectional view of an optical imaging lens5having five 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 may be similar to those in the first embodiment for the similar elements, but here the reference numbers may be initialed with5; for example, reference number531may label the object-side surface of the third lens element530, reference number532may label 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, and a fifth lens element550.

The arrangements of the convex or concave surface structures, including the object-side surfaces511,521,531,541and the image-side surfaces512,542,552may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens1(FIG. 6depicting the first example embodiment) and the optical imaging lens5(FIG. 22depicting the fifth example embodiment) may include the convex or concave surface structure of the object-side surface551and image-side surfaces522and532. Additional differences may include a radius of curvature, a thickness, aspherical data, and an effective focal length of each lens element. More specifically, the object-side surface551of the fifth lens element550may include a convex portion5512in a vicinity of a periphery of the fifth lens element550, the image-side surface522of the second lens element520may include a concave portion5222in a vicinity of a periphery of the second lens element520, and the image-side surface532of the third lens element530may include a concave portion5322in a vicinity of a periphery of the third lens element530.

Here, in the interest of clearly showing the drawings of a particular embodiment, only the surface shapes which are different from that in the first embodiment may be 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. 23(a), the offset of the off-axis light relative to the image point may be within about ±0.03 mm. Referring toFIG. 23(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. 23(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 ±0.035 mm. Referring toFIG. 23(d), the variation of the distortion aberration of the optical imaging lens5may be within about ±5%.

In comparison with the first embodiment, the imaging quality is better and the optical imaging lens can be manufactured more easily and the yield rate is higher.

Reference is now made toFIGS. 26-29.FIG. 26illustrates an example cross-sectional view of an optical imaging lens6having five 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 with6; for example, reference number631may label the object-side surface of the third lens element630, reference number632may label 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 a first lens element610, an aperture stop600, a second lens element620, a third lens element630, a fourth lens element640, and a fifth lens element650.

The arrangements of the convex or concave surface structures, including the object-side surfaces611,621and the image-side surfaces632,652may be generally similar to the optical imaging lens1(FIG. 6depicting the first example embodiment), but the differences between the optical imaging lens1and the optical imaging lens6may include the convex or concave surface structures of the object-side surfaces631,641and651and the image-side surfaces612,622and642and the position of the aperture stop600. Additional differences may include a radius of curvature, a thickness, aspherical data, and an effective focal length of each lens element. More specifically, the aperture stop600is disposed between the first lens element610and the second lens element620, the object-side surface631of the third lens element630may comprise a concave portion6311in a vicinity of the optical axis, the object-side surface641of the fourth lens element640may include a convex portion6411in a vicinity of the optical axis, the object-side surface651of the fifth lens element650may include a concave portion6511in a vicinity of the optical axis and a convex portion6512in a vicinity of a periphery of the fifth lens element650, the image-side surface612of the first lens element610may include a concave portion6122in a vicinity of a periphery of the first lens element610, the image-side surface622of the second lens element620may include a concave portion6222in a vicinity of a periphery of the second lens element620, and the image-side surface642of the fourth lens element640may include a concave portion6422in a vicinity of a periphery of the fourth lens element640.

Here, in the interest of clearly showing the drawings of a particular embodiment, only the surface shapes which are different from that in the first embodiment may be 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. 27(a), the offset of the off-axis light relative to the image point may be within about ±0.025 mm. Referring toFIG. 27(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. 23(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 ±0.05 mm. Referring toFIG. 27(d), the variation of the distortion aberration of the optical imaging lens6may be within about ±1%.

In comparison with the first example embodiment (e.g.,FIG. 6), the sixth example embodiment may have improved imaging quality, the optical imaging lens may be manufactured more easily, and the yield rate may be higher.

The range of values including the maximum and minimum values obtained by the combination ratio relationship of the optical parameters disclosed in the various embodiments of the present disclosure can be practiced.

The arrangements of the image-side surface of the first lens element having a concave portion in a vicinity of the optical axis, the image-side surface of the second lens element having a concave portion in a vicinity of the optical axis, and the image-side surface of the fifth lens element having a concave portion in a vicinity of the optical axis may assist in converging light. The arrangement of the object-side surface of the fourth lens element having a convex portion in a vicinity of a periphery of the fourth lens element may assist in converging light. When light enters the fourth and the fifth lens elements with a large incident angle, it may deviate from the efficient radius of the fourth or fifth lens element such that the light can't reach the imaging plane. The arrangement of the object-side surface of the fourth lens element having a convex portion in a vicinity of a periphery of the fourth lens element may improve this drawback. The arrangements of the object-side surface of the second lens element having a concave portion in a vicinity of the optical axis, the image-side surface of the third lens element having a convex portion in a vicinity of the optical axis, and the image-side surface of the fifth lens element having a convex portion in a vicinity of the periphery of the fifth lens element may correct the total aberration. The second lens element having negative refracting power may eliminate the aberration caused by the first lens element. The third and the fourth lens elements having positive refracting powers may assist on correcting aberrations. Via the above arrangements, the length of the optical imaging lens may be shortened efficiently and the imaging quality may be maintained.

For shortening the length of the optical imaging lens, the gap between two adjacent lens elements and the thickness of each lens element may be appropriately decreased. Furthermore, if the assembly difficulty and the imaging quality are also considered simultaneously, the thickness and the gaps may satisfy any one of inequalities as follows:
(T4+G45+T5)/T4≤2.300, and a more advantageous range is “1.200≤(T4+G45+T5)/T4≤2.300”
G12/T2≤1.800, and a more advantageous range is “0.600≤G12/T2≤1.800”
T5/G1≤2.300, and a more advantageous range is “0.200≤T5/G12≤2.300”
ALT/T5≤10.000, and a more advantageous range is “3.300≤ALT/T5≤10.000”
AAG/T1≤2.600, and a more advantageous range is “1.400≤AAG/T1≤2.600”
AAG/T3≤1.800, and a more advantageous range is “1.200≤AAG/T3≤1.800”
AAG/G34≤3.300, and a more advantageous range is “1.800≤AAG/G34≤3.300”
(T2+G23+T3)/T1≤2.100, and a more advantageous range is “1.300≤(T2+G23+T3)/T1≤2.100”
(T2+G23+T3)/T3≤1.900, and a more advantageous range is “1.500≤(T2+G23+T3)/T3≤1.900”
(T2+G23+T3)/G34≤2.500, and a more advantageous range is “2.000≤(T2+G23+T3)/G34≤2.500”;
(T4+G45+T5)/T1≤2.700, and a more advantageous range is “1.800≤(T4+G45+T5)/T1≤2.700”; and
ALT/T1≤5.200, and a more advantageous range is “4.200≤ALT/T1≤5.200”.

The difficulty for manufacturing the optical imaging lens may be increased when the optical parameters of the optical imaging lens are too small. The length of the optical imaging lens may be increased when optical parameters of the optical imaging lens are too large. In order to overcome these drawbacks, some optical parameters of the optical imaging lens may satisfy any one of inequalities as follows:
TTL/BFL≤3.900, and a more advantageous range is “2.800≤TTL/BFL≤3.900”;
TL/G12≤10.000, and a more advantageous range is “4.300≤TL/G12≤10.000”
TTL/T4≤8.300, and a more advantageous range is “5.000≤TTL/T4≤8.300”
TL/BFL≤6.400, and a more advantageous range is “2.000TL/BFL≤6.400”
TL/G34≤10.000, and a more advantageous range is “8.100≤TL/G34≤10.000”.

Decreasing the value of EFL is advantageous for increasing HFOV. Therefore, HFOV can be increased when some optical parameters of the optical imaging lens may satisfy any one of inequalities as follows:
EFL/T4≤5.900, and a more advantageous range is “0.400≤EFL/T4≤5.900”; and
EFL/T1≤6.800, and a more advantageous range is “0.800≤EFL/T1≤6.800”.

According to the present disclosure, the longitudinal spherical aberration, the astigmatism aberration, and the variation of the distortion aberration of each embodiment may 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.