OPTICAL IMAGING LENS

An optical imaging lens includes a first lens element to a seventh lens element; each lens element has an object-side surface and an image-side surface. A periphery region of the image-side surface of the third lens element is concave, an optical axis region of the object-side surface of the fourth lens element is concave, the fifth lens element has negative refracting power, an optical axis region of the object-side surface of the seventh lens element is convex, and a periphery region of the object-side surface of the seventh lens element is concave. Lens elements included by the optical imaging lens are only seven lens elements described above to satisfy 2.200≤(T1+D42t72)/(Fno*D12t32) and 115.000≤ν3+ν4+ν5.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to an optical imaging lens. Specifically speaking, the present invention is directed to an optical imaging lens for using in electronic devices, such as for using in portable electronic devices, for example a mobile phone, a camera, a tablet personal computer, or a personal digital assistant (PDA) and for taking pictures or for recording videos.

2. Description of the Prior Art

The specifications of portable electronic devices are changing, and their key components-optical imaging lenses are also developing more diversely. As far as a main lens of a portable electronic device is concerned, it does not only pursues a smaller f-number (Fno) and maintain a shorter system length, but also pursues more pixels and better resolution. More pixels imply the increase of the image height of the lens to receive more imaging rays to meet the pixel demands by using a larger imaging sensor.

However, the design of a small f-number makes the lens receive more imaging rays and more difficult to design. More pixels make the resolution of the lens higher to go with the design of a small f-number to make it much more difficult to design. Therefore, it is a problem to add more lens elements in the limited system length and to increase the resolution while to have a small f-number and a larger image height to be solved.

SUMMARY OF THE INVENTION

In the light of the above, various embodiments of the present invention propose an optical imaging lens of seven lens elements which has a small f-number, a larger image height, a shorter system length, maintains good imaging quality, and is technically possible. The optical imaging lens of seven lens elements of the present invention from an object side to an image side in order along an optical axis has a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each first lens element, second lens element, third lens element, fourth lens element, fifth lens element, sixth lens element and seventh lens element respectively has an object-side surface which faces toward the object side to allow imaging rays to pass through as well as an image-side surface which faces toward the image side to allow the imaging rays to pass through.

In one embodiment, a periphery region of the image-side surface of the third lens element is concave, an optical axis region of the object-side surface of the fourth lens element is concave, the fifth lens element has negative refracting power, an optical axis region of the object-side surface of the seventh lens element is convex, and a periphery region of the object-side surface of the seventh lens element is concave. Lens elements included by the optical imaging lens are only the seven lens elements described above to satisfy 2.200≤(T1+D42t72)/(Fno*D12t32) and 115.000≤ν3+ν4+0.

In another embodiment of the present invention, a periphery region of the image-side surface of the third lens element is concave, an optical axis region of the object-side surface of the fourth lens element is concave, the fifth lens element has negative refracting power, an optical axis region of the image-side surface of the sixth lens element is concave, and a periphery region of the object-side surface of the seventh lens element is concave. Lens elements included by the optical imaging lens are only the seven lens elements described above to satisfy 1.200≤D32t72/(Fno*D11t32) and 115.000≤ν3+ν4+ν5.

In still another embodiment of the present invention, an optical axis region of the image-side surface of the first lens element is concave, the second lens element has negative refracting power, a periphery region of the image-side surface of the third lens element is concave, an optical axis region of the object-side surface of the fourth lens element is concave, an optical axis region of the object-side surface of the fifth lens element is concave, and a periphery region of the object-side surface of the seventh lens element is concave. Lens elements included by the optical imaging lens are only the seven lens elements described above to satisfy 2.550≤(T1+D42t72)/(Fno*D12t32).

In the optical imaging lens of the present invention, the embodiments may also selectively satisfy the following optical relationships:

In the present invention, T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, T5 is a thickness of the fifth lens element along the optical axis, T6 is a thickness of the sixth lens element along the optical axis, T7 is a thickness of the seventh lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, G34 is an air gap between the third lens element and the fourth lens element along the optical axis, G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis, G56 is an air gap between the fifth lens element and the sixth lens element along the optical axis, and G67 is an air gap between the sixth lens element and the seventh lens element along the optical axis.

D11t22 is defined as the a distance from the object-side surface of the first lens element to the image-side surface of the second lens element along the optical axis, D42t72 is defined as the a distance from the image-side surface of the fourth lens element to the image-side surface of the seventh lens element along the optical axis, D12t32 is defined as the a distance from the image-side surface of the first lens element to the image-side surface of the third lens element along the optical axis, D32t72 is defined as the a distance from the image-side surface of the third lens element to the image-side surface of the seventh lens element along the optical axis, and D11t32 is defined as the a distance from the object-side surface of the first lens element to the image-side surface of the third lens element along the optical axis.

In addition, AAG is a sum of six air gaps from the first lens element to the seventh lens element along the optical axis, ALT is a sum of thicknesses of the seven lens elements from the first lens element to the seventh lens element along the optical axis, TL is a distance from the object-side surface of the first lens element to the image-side surface of the seventh lens element along the optical axis, TTL is the distance from the object-side surface of the first lens element to an image plane along the optical axis, BFL is a distance from the image-side surface of the seventh lens element to the image plane along the optical axis, Fno is an f-number of the optical imaging lens, EFL is an effective focal length of the optical imaging lens, ν1 is an Abbe number of the first lens element, ν2 is an Abbe number of the second lens element, ν3 is an Abbe number of the third lens element, ν4 is an Abbe number of the fourth lens element, ν5 is an Abbe number of the fifth lens element, ν6 is an Abbe number of the sixth lens element, and ν7 is an Abbe number of the seventh lens element.

DETAILED DESCRIPTION

The terms “optical axis region”, “periphery region”, “concave”, and “convex” used in this specification and claims should be interpreted based on the definition listed in the specification by the principle of lexicographer.

In the present disclosure, the optical system may comprise at least one lens element to receive imaging rays that are incident on the optical system over a set of angles ranging from parallel to an optical axis to a half field of view (HFOV) angle with respect to the optical axis. The imaging rays pass through the optical system to produce an image on an image plane. The term “a lens element having positive refracting power (or negative refracting power)” means that the paraxial refracting power of the lens element in Gaussian optics is positive (or negative). The term “an object-side (or image-side) surface of a lens element” refers to a specific region of that surface of the lens element at which imaging rays can pass through that specific region. Imaging rays include at least two types of rays: a chief ray Lc and a marginal ray Lm (as shown inFIG.1). An object-side (or image-side) surface of a lens element can be characterized as having several regions, including an optical axis region, a periphery region, and, in some cases, one or more intermediate regions, as discussed more fully below.

FIG.1is a radial cross-sectional view of a lens element100. Two referential points for the surfaces of the lens element100can be defined: a central point, and a transition point. The central point of a surface of a lens element is a point of intersection of that surface and the optical axis I. As illustrated inFIG.1, a first central point CP1 may be present on the object-side surface110of lens element100and a second central point CP2 may be present on the image-side surface120of the lens element100. The transition point is a point on a surface of a lens element, at which the line tangent to that point is perpendicular to the optical axis I. The optical boundary OB of a surface of the lens element is defined as a point at which the radially outermost marginal ray Lm passing through the surface of the lens element intersects the surface of the lens element. All transition points lie between the optical axis I and the optical boundary OB of the surface of the lens element. A surface of the lens element100may have no transition point or have at least one transition point. If multiple transition points are present on a single surface, then these transition points are sequentially named along the radial direction of the surface with reference numerals starting from the first transition point. For example, the first transition point, e.g., TP1, (closest to the optical axis I), the second transition point, e.g., TP2, (as shown inFIG.4), and the Nth transition point (farthest from the optical axis I).

When a surface of the lens element has at least one transition point, the region of the surface of the lens element from the central point to the first transition point TP1 is defined as the optical axis region, which includes the central point. The region located radially outside of the farthest transition point (the Nth transition point) from the optical axis I to the optical boundary OB of the surface of the lens element is defined as the periphery region. In some embodiments, there may be intermediate regions present between the optical axis region and the periphery region, with the number of intermediate regions depending on the number of the transition points. When a surface of the lens element has no transition point, the optical axis region is defined as a region of 0%-50% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element, and the periphery region is defined as a region of 50%-100% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element.

The shape of a region is convex if a collimated ray being parallel to the optical axis I and passing through the region is bent toward the optical axis I such that the ray intersects the optical axis I on the image side A2 of the lens element. The shape of a region is concave if the extension line of a collimated ray being parallel to the optical axis I and passing through the region intersects the optical axis I on the object side A1 of the lens element.

Additionally, referring toFIG.1, the lens element100may also have a mounting portion130extending radially outward from the optical boundary OB. The mounting portion130is typically used to physically secure the lens element to a corresponding element of the optical system (not shown). Imaging rays do not reach the mounting portion130. The structure and shape of the mounting portion130are only examples to explain the technologies, and should not be taken as limiting the scope of the present disclosure. The mounting portion130of the lens elements discussed below may be partially or completely omitted in the following drawings.

Referring toFIG.2, optical axis region Z1 is defined between central point CP and first transition point TP1. Periphery region Z2 is defined between TP1 and the optical boundary OB of the surface of the lens element. Collimated ray211intersects the optical axis Ion the image side A2 of lens element200after passing through optical axis region Z1, i.e., the focal point of collimated ray211after passing through optical axis region Z1 is on the image side A2 of the lens element200at point R inFIG.2. Accordingly, since the ray itself intersects the optical axis I on the image side A2 of the lens element200, optical axis region Z1 is convex. On the contrary, collimated ray212diverges after passing through periphery region Z2. The extension line EL of collimated ray212after passing through periphery region Z2 intersects the optical axis I on the object side A1 of lens element200, i.e., the focal point of collimated ray212after passing through periphery region Z2 is on the object side A1 at point M inFIG.2. Accordingly, since the extension line EL of the ray intersects the optical axis I on the object side A1 of the lens element200, periphery region Z2 is concave. In the lens element200illustrated inFIG.2, the first transition point TP1 is the border of the optical axis region and the periphery region, i.e., TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skill in the art to determine whether an optical axis region is convex or concave by referring to the sign of “Radius of curvature” (the “R” value), which is the paraxial radius of shape of a lens surface in the optical axis region. The R value is commonly 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, a positive R value defines that the optical axis region of the object-side surface is convex, and a negative R value defines that the optical axis region of the object-side surface is concave. Conversely, for an image-side surface, a positive R value defines that the optical axis region of the image-side surface is concave, and a negative R value defines that the optical axis region of the image-side surface is convex. The result found by using this method should be consistent with the method utilizing intersection of the optical axis by rays/extension lines mentioned above, which determines surface shape by referring to whether the focal point of a collimated ray being parallel to the optical axis I is on the object-side or the image-side of a lens element. As used herein, the terms “a shape of a region is convex (concave),” “a region is convex (concave),” and “a convex-(concave-) region,” can be used alternatively.

FIG.3,FIG.4andFIG.5illustrate examples of determining the shape of lens element regions and the boundaries of regions under various circumstances, including the optical axis region, the periphery region, and intermediate regions as set forth in the present specification.

FIG.3is a radial cross-sectional view of a lens element300. As illustrated inFIG.3, only one transition point TP1 appears within the optical boundary OB of the image-side surface320of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-side surface320of lens element300are illustrated. The R value of the image-side surface320is positive (i.e., R>0). Accordingly, the optical axis region Z1 is concave.

In general, the shape of each region demarcated by the transition point will have an opposite shape to the shape of the adjacent region(s). Accordingly, the transition point will define a transition in shape, changing from concave to convex at the transition point or changing from convex to concave. InFIG.3, since the shape of the optical axis region Z1 is concave, the shape of the periphery region Z2 will be convex as the shape changes at the transition point TP1.

FIG.4is a radial cross-sectional view of a lens element400. Referring toFIG.4, a first transition point TP1 and a second transition point TP2 are present on the object-side surface410of lens element400. The optical axis region Z1 of the object-side surface410is defined between the optical axis I and the first transition point TP1. The R value of the object-side surface410is positive (i.e., R>0). Accordingly, the optical axis region Z1 is convex.

The periphery region Z2 of the object-side surface410, which is also convex, is defined between the second transition point TP2 and the optical boundary OB of the object-side surface410of the lens element400. Further, intermediate region Z3 of the object-side surface410, which is concave, is defined between the first transition point TP1 and the second transition point TP2. Referring once again toFIG.4, the object-side surface410includes an optical axis region Z1 located between the optical axis I and the first transition point TP1, an intermediate region Z3 located between the first transition point TP1 and the second transition point TP2, and a periphery region Z2 located between the second transition point TP2 and the optical boundary OB of the object-side surface410. Since the shape of the optical axis region Z1 is designed to be convex, the shape of the intermediate region Z3 is concave as the shape of the intermediate region Z3 changes at the first transition point TP1, and the shape of the periphery region Z2 is convex as the shape of the periphery region Z2 changes at the second transition point TP2.

FIG.5is a radial cross-sectional view of a lens element500. Lens element500has no transition point on the object-side surface510of the lens element500. For a surface of a lens element with no transition point, for example, the object-side surface510the lens element500, the optical axis region Z1 is defined as the region of 0%-50% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element and the periphery region is defined as the region of 50%-100% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element. Referring to lens element500illustrated inFIG.5, the optical axis region Z1 of the object-side surface510is defined between the optical axis I and 50% of the distance between the optical axis I and the optical boundary OB. The R value of the object-side surface510is positive (i.e., R>0). Accordingly, the optical axis region Z1 is convex. For the object-side surface510of the lens element500, because there is no transition point, the periphery region Z2 of the object-side surface510is also convex. It should be noted that lens element500may have a mounting portion (not shown) extending radially outward from the periphery region Z2.

As shown inFIG.6, the optical imaging lens1of seven lens elements of the present invention, sequentially located from an object side A1 (where an object is located) to an image side A2 along an optical axis I, has a first lens element10, a second lens element20, a third lens element30, a fourth lens element40, a fifth lens element50, a sixth lens element60, a seventh lens element70, and an image plane4. Generally speaking, the first lens element10, the second lens element20, the third lens element30, the fourth lens element40, the fifth lens element50, the sixth lens element60and the seventh lens element70may be made of a transparent plastic material but the present invention is not limited to this, and each lens element has an appropriate refracting power. In the present invention, lens elements having refracting power included by the optical imaging lens1are only the seven lens elements (the first lens element10, the second lens element20, the third lens element30, the fourth lens element40, the fifth lens element50, the sixth lens element60and the seven lens element70) described above. The optical axis I is the optical axis of the entire optical imaging lens1, and the optical axis of each of the lens elements coincides with the optical axis of the optical imaging lens1.

Furthermore, the optical imaging lens1includes an aperture stop (ape. stop)2disposed in an appropriate position. InFIG.6, the aperture stop2is disposed between the first lens element10and the object side A1, namely on the side of the first lens element10facing the object side A1. When ray emitted or reflected by an object (not shown) which is located at the object side A1 enters the optical imaging lens1of the present invention, it forms a clear and sharp image on the image plane4at the image side A2 after passing through the aperture stop2, the first lens element10, the second lens element20, the third lens element30, the fourth lens element40, the fifth lens element50, the sixth lens element60, the seventh lens element70and the filter3. In one embodiment of the present invention, the filter3is placed between the seventh lens element70and the image plane4. The optional filter3may be a filter of various suitable functions, for example, the filter3may be an infrared cut-off filter (IR cut filter), which is used to prevent infrared rays in the imaging rays from reaching the image plane4to jeopardize the imaging quality.

Each lens element in the optical imaging lens1of the present invention has an object-side surface facing toward the object side A1 to allow imaging rays to pass through as well as an image-side surface facing toward the image side A2 to allow the imaging rays to pass through. For example, the first lens element10has an object-side surface11and an image-side surface12, the second lens element20has an object-side surface21and an image-side surface22, the third lens element30has an object-side surface31and an image-side surface32, the fourth lens element40has an object-side surface41and an image-side surface42, the fifth lens element50has an object-side surface51and an image-side surface52, the sixth lens element60has an object-side surface61and an image-side surface62, and the seventh lens element70has an object-side surface71and an image-side surface72. In addition, each object-side surface and image-side surface in the optical imaging lens1of the present invention has an optical axis region and a periphery region.

Each lens element in the optical imaging lens1of the present invention further has a thickness T along the optical axis I. For example, the first lens element10has a first lens element thickness T1, the second lens element20has a second lens element thickness T2, the third lens element30has a third lens element thickness T3, the fourth lens element40has a fourth lens element thickness T4, the fifth lens element50has a fifth lens element thickness T5, the sixth lens element60has a sixth lens element thickness T6, the seventh lens element70has a seventh lens element thickness T7. Therefore, a sum of thicknesses of the seven lens elements from the first lens element10to the seventh lens element70along the optical axis I is ALT, namely ALT=T1+T2+T3+T4+T5+T6+T7.

In addition, between two adjacent lens elements in the optical imaging lens1of the present invention there may be an air gap along the optical axis I. For example, there is an air gap G12 between the first lens element10and the second lens element20, an air gap G23 between the second lens element20and the third lens element30, an air gap G34 between the third lens element30and the fourth lens element40, an air gap G45 between the fourth lens element40and the fifth lens element50, an air gap G56 between the fifth lens element50and the sixth lens element60as well as an air gap G67 between the sixth lens element60and the seventh lens element70. Therefore, the sum of six air gaps from the first lens element10to the seventh lens element70along the optical axis I is AAG, namely AAG=G12+G23+G34+G45+G56+G67.

D11t22 is a distance from the object-side surface11of the first lens element10to the image-side surface22of the second lens element20along the optical axis I, D42t72 is a distance from the image-side surface42of the fourth lens element40to the image-side surface72of the seventh lens element70along the optical axis I, D12t32 is a distance from the image-side surface12of the first lens element10to the image-side surface32of the third lens element30along the optical axis I, D32t72 is a distance from the image-side surface32of the third lens element30to the image-side surface72of the seventh lens element70along the optical axis I, and D11t32 is a distance from the object-side surface11of the first lens element10to the image-side surface32of the third lens element30along the optical axis I.

In addition, a distance from the object-side surface11of the first lens element10to the image plane4along the optical axis I is TTL, namely a system length of the optical imaging lens1; an effective focal length of the optical imaging lens1is EFL; a distance from the object-side surface11of the first lens element10to the image-side surface72of the seventh lens element70along the optical axis I is TL; HFOV stands for the half field of view which is half of the field of view of the entire optical imaging lens1; ImgH is an image height of the optical imaging lens1. Fno is an f-number of the optical imaging lens1. EPD is the entrance pupil diameter of the optical imaging lens1, which is equivalent to EFL divided by Fno, namely EPD=EFL/Fno.

When the filter3is placed between the seventh lens element70and the image plane4, an air gap between the seventh lens element70and the filter3along the optical axis I is G7F; a thickness of the filter3along the optical axis I is TF; an air gap between the filter3and the image plane4along the optical axis I is GFP; and a distance from the image-side surface72of the seventh lens element70to the image plane4along the optical axis I is BFL, namely the back focal length of the optical imaging lens1. Therefore, BFL=G7F+TF+GFP.

Furthermore, a focal length of the first lens element10is f1; a focal length of the second lens element20is f2; a focal length of the third lens element30is f3; a focal length of the fourth lens element40is f4; a focal length of the fifth lens element50is f5; a focal length of the sixth lens element60is f6; a focal length of the seventh lens element70is f7; a refractive index of the first lens element10is n1; a refractive index of the second lens element20is n2; a refractive index of the third lens element30is n3; a refractive index of the fourth lens element40is n4; a refractive index of the fifth lens element50is n5; a refractive index of the sixth lens element60is n6; a refractive index of the seventh lens element70is n7; an Abbe number of the first lens element10is ν1; an Abbe number of the second lens element20is ν2; an Abbe number of the third lens element30is ν3; an Abbe number of the fourth lens element40is ν4; an Abbe number of the fifth lens element50is ν5; an Abbe number of the sixth lens element60is ν6; an Abbe number of the seventh lens element70is ν7.

First Embodiment

Please refer toFIG.6which illustrates the first embodiment of the optical imaging lens1of the present invention. Please refer toFIG.7Afor the longitudinal spherical aberration on the image plane4of the first embodiment; please refer toFIG.7Bfor the field curvature aberration on the sagittal direction; please refer toFIG.7Cfor the field curvature aberration on the tangential direction; and please refer toFIG.7Dfor the distortion aberration. The Y axis of the spherical aberration in each embodiment is “field of view” for 1.0. The Y axis of each aberration and the distortion in each embodiment stands for “image height” (ImgH), and the image height of the first embodiment is 6.641 mm.

The optical imaging lens1of the first embodiment is mainly composed of seven lens elements10,20,30,40,50,60and70with refracting power, an aperture stop2, and an image plane4. The aperture stop2is disposed on the side of the first lens element10facing the object side A1.

The first lens element10has positive refracting power. An optical axis region13of the object-side surface11of the first lens element10is convex, and a periphery region14of the object-side surface11of the first lens element10is convex. An optical axis region16of the image-side surface12of the first lens element10is concave, and a periphery region17of the image-side surface12of the first lens element10is concave. Besides, both the object-side surface11and the image-side surface12of the first lens element10are aspheric surfaces, but it is not limited thereto.

The second lens element20has negative refracting power. An optical axis region23of the object-side surface21of the second lens element20is convex, and a periphery region24of the object-side surface21of the second lens element20is convex. An optical axis region26of the image-side surface22of the second lens element20is concave, and a periphery region27of the image-side surface22of the second lens element20is concave. Besides, both the object-side surface21and the image-side surface22of the second lens element20are aspheric surfaces, but it is not limited thereto.

The third lens element30has positive refracting power. An optical axis region33of the object-side surface31of the third lens element30is convex, and a periphery region34of the object-side surface31of the third lens element30is convex. An optical axis region36of the image-side surface32of the third lens element30is concave, and a periphery region37of the image-side surface32of the third lens element30is concave. Besides, both the object-side surface31and the image-side surface32of the third lens element30are aspheric surfaces, but it is not limited thereto.

The fourth lens element40has positive refracting power. An optical axis region43of the object-side surface41of the fourth lens element40is concave, and a periphery region44of the object-side surface41of the fourth lens element40is concave. An optical axis region46of the image-side surface42of the fourth lens element40is convex, and a periphery region47of the image-side surface42of the fourth lens element40is convex. Besides, both the object-side surface41and the image-side surface42of the fourth lens element40are aspheric surfaces, but it is not limited thereto.

The fifth lens element50has negative refracting power. An optical axis region53of the object-side surface51of the fifth lens element50is concave, and a periphery region54of the object-side surface51of the fifth lens element50is concave. An optical axis region56of the image-side surface52of the fifth lens element50is concave, and a periphery region57of the image-side surface52of the fifth lens element50is convex. Besides, both the object-side surface51and the image-side surface52of the fifth lens element50are aspheric surfaces, but it is not limited thereto.

The sixth lens element60has positive refracting power. An optical axis region63of the object-side surface61of the sixth lens element60is convex, and a periphery region64of the object-side surface61of the sixth lens element60is concave. An optical axis region66of the image-side surface62of the sixth lens element60is concave, and a periphery region67of the image-side surface62of the sixth lens element60is convex. Besides, both the object-side surface61and the image-side surface62of the sixth lens element60are aspheric surfaces, but it is not limited thereto.

The seventh lens element70has negative refracting power. An optical axis region73of the object-side surface71of the seventh lens element70is convex, and a periphery region74of the object-side surface71of the seventh lens element70is concave. An optical axis region76of the image-side surface72of the seventh lens element70is concave, and a periphery region77of the image-side surface72of the seventh lens element70is convex. Besides, both the object-side surface71and the image-side surface72of the seventh lens element70are aspheric surfaces, but it is not limited thereto.

In the first lens element10, the second lens element20, the third lens element30, the fourth lens element40, the fifth lens element50, the sixth lens element60and the seventh lens element70of the optical imaging lens element1of the present invention, there are 14 surfaces, such as the object-side surfaces11/21/31/41/51/61/71and the image-side surfaces12/22/32/42/52/62/72. If a surface is aspheric, these aspheric coefficients are defined according to the following formula:

In which:

Y represents a vertical distance from a point on the aspheric surface to the optical axis I;
Z represents the depth of an aspheric surface (the perpendicular distance between the point of the aspheric surface at a distance Y from the optical axis I and the tangent plane of the vertex on the optical axis I of the aspheric surface);
R represents the radius of curvature of the lens element surface;
K is a conic constant; and
aiis the aspheric coefficient of the ithorder and every a2in each embodiment is 0.

The optical data of the first embodiment of the optical imaging lens1are shown inFIG.24while the aspheric surface data are shown inFIG.25. In the present embodiments of the optical imaging lens, the f-number of the entire optical imaging lens is Fno, EFL is the effective focal length, HFOV stands for the half field of view which is half of the field of view of the entire optical imaging lens, and the unit for the radius of curvature, the thickness and the focal length is in millimeters (mm). In this embodiment, TTL=8.684 mm; EFL=6.546 mm; HFOV=42.185 degrees; ImgH=6.641 mm; Fno=1.700.

Second Embodiment

Please refer toFIG.8which illustrates the second embodiment of the optical imaging lens1of the present invention. It is noted that from the second embodiment to the following embodiments, in order to simplify the figures, only the components different from what the first embodiment has, and the basic lens elements will be labeled in figures. Other components that are the same as what the first embodiment has, such as the object-side surface, the image-side surface, the optical axis region and the periphery region will be omitted in the following embodiments. Please refer toFIG.9Afor the longitudinal spherical aberration on the image plane4of the second embodiment, please refer toFIG.9Bfor the field curvature aberration on the sagittal direction, please refer toFIG.9Cfor the field curvature aberration on the tangential direction, and please refer toFIG.9Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, the fourth lens element40has negative refracting power, and an optical axis region46of the image-side surface42of the fourth lens element40is concave.

The optical data of the second embodiment of the optical imaging lens are shown inFIG.26while the aspheric surface data are shown inFIG.27. In this embodiment, TTL=8.779 mm; EFL=6.571 mm; HFOV=42.185 degrees; ImgH=6.594 mm; Fno=1.700. In particular: the distortion aberration in this embodiment is smaller than the distortion aberration in the first embodiment.

Third Embodiment

Please refer toFIG.10which illustrates the third embodiment of the optical imaging lens1of the present invention. Please refer toFIG.11Afor the longitudinal spherical aberration on the image plane4of the third embodiment; please refer toFIG.11Bfor the field curvature aberration on the sagittal direction; please refer toFIG.11Cfor the field curvature aberration on the tangential direction; and please refer toFIG.11Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, the third lens element30has negative refracting power, an optical axis region56of the image-side surface52of the fifth lens element50is convex, the sixth lens element60has negative refracting power, and the seventh lens element70has positive refracting power.

The optical data of the third embodiment of the optical imaging lens are shown inFIG.28while the aspheric surface data are shown inFIG.29. In this embodiment, TTL=8.627 mm; EFL=6.837 mm; HFOV=36.468 degrees; ImgH=6.700 mm; Fno=1.700. In particular: 1. the system length of the optical imaging lens TTL in this embodiment is shorter than the system length of the optical imaging lens TTL in the first embodiment; 2. the field curvature aberration on the sagittal direction in this embodiment is smaller than the field curvature aberration on the sagittal direction in the first embodiment; 3. the field curvature aberration on the tangential direction in this embodiment is smaller than the field curvature aberration on the tangential direction in the first embodiment.

Fourth Embodiment

Please refer toFIG.12which illustrates the fourth embodiment of the optical imaging lens1of the present invention. Please refer toFIG.13Afor the longitudinal spherical aberration on the image plane4of the fourth embodiment; please refer toFIG.13Bfor the field curvature aberration on the sagittal direction; please refer toFIG.13Cfor the field curvature aberration on the tangential direction; and please refer toFIG.13Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, a periphery region17of the image-side surface12of the first lens element10is convex.

The optical data of the fourth embodiment of the optical imaging lens are shown inFIG.30while the aspheric surface data are shown inFIG.31. In this embodiment, TTL=8.769 mm; EFL=6.854 mm; HFOV=40.011 degrees; ImgH=6.700 mm; Fno=1.700. In particular: 1. the field curvature aberration on the sagittal direction in this embodiment is smaller than the field curvature aberration on the sagittal direction in the first embodiment; 2. the field curvature aberration on the tangential direction in this embodiment is smaller than the field curvature aberration on the tangential direction in the first embodiment.

Fifth Embodiment

Please refer toFIG.14which illustrates the fifth embodiment of the optical imaging lens1of the present invention. Please refer toFIG.15Afor the longitudinal spherical aberration on the image plane4of the fifth embodiment; please refer toFIG.15Bfor the field curvature aberration on the sagittal direction; please refer toFIG.15Cfor the field curvature aberration on the tangential direction, and please refer toFIG.15Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment.

The optical data of the fifth embodiment of the optical imaging lens are shown inFIG.32while the aspheric surface data are shown inFIG.33. In this embodiment, TTL=9.553 mm; EFL=6.681 mm; HFOV=42.184 degrees; ImgH=5.856 mm; Fno=1.700. In particular: 1. the field curvature aberration on the tangential direction in this embodiment is smaller than the field curvature aberration on the tangential direction in the first embodiment; 2. the distortion aberration in this embodiment is smaller than the distortion aberration in the first embodiment.

Sixth Embodiment

Please refer toFIG.16which illustrates the sixth embodiment of the optical imaging lens1of the present invention. Please refer toFIG.17Afor the longitudinal spherical aberration on the image plane4of the sixth embodiment; please refer toFIG.17Bfor the field curvature aberration on the sagittal direction; please refer toFIG.17Cfor the field curvature aberration on the tangential direction, and please refer toFIG.17Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, a periphery region17of the image-side surface12of the first lens element10is convex.

The optical data of the sixth embodiment of the optical imaging lens are shown inFIG.34while the aspheric surface data are shown inFIG.35. In this embodiment, TTL=8.675 mm; EFL=6.627 mm; HFOV=42.184 degrees; ImgH=6.345 mm; Fno=1.700. In particular: 1. the system length of the optical imaging lens TTL in this embodiment is shorter than the system length of the optical imaging lens TTL in the first embodiment; 2. the field curvature aberration on the tangential direction in this embodiment is smaller than the field curvature aberration on the tangential direction in the first embodiment; 3. the distortion aberration in this embodiment is smaller than the distortion aberration in the first embodiment.

Seventh Embodiment

Please refer toFIG.18which illustrates the seventh embodiment of the optical imaging lens1of the present invention. Please refer toFIG.19Afor the longitudinal spherical aberration on the image plane4of the seventh embodiment; please refer toFIG.19Bfor the field curvature aberration on the sagittal direction; please refer toFIG.19Cfor the field curvature aberration on the tangential direction, and please refer toFIG.19Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, a periphery region17of the image-side surface12of the first lens element10is convex.

The optical data of the seventh embodiment of the optical imaging lens are shown inFIG.36while the aspheric surface data are shown inFIG.37. In this embodiment, TTL=9.059 mm; EFL=7.132 mm; HFOV=42.184 degrees; ImgH=6.565 mm; Fno=1.700. In particular: 1. the field curvature aberration on the tangential direction in this embodiment is smaller than the field curvature aberration on the tangential direction in the first embodiment; 2. the distortion aberration in this embodiment is smaller than the distortion aberration in the first embodiment.

Eighth Embodiment

Please refer toFIG.20which illustrates the eighth embodiment of the optical imaging lens1of the present invention. Please refer toFIG.21Afor the longitudinal spherical aberration on the image plane4of the eighth embodiment; please refer toFIG.21Bfor the field curvature aberration on the sagittal direction; please refer toFIG.21Cfor the field curvature aberration on the tangential direction, and please refer toFIG.21Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, a periphery region27of the image-side surface22of the second lens element20is convex, and a periphery region34of the object-side surface31of the third lens element30is concave.

The optical data of the eighth embodiment of the optical imaging lens are shown inFIG.38while the aspheric surface data are shown inFIG.39. In this embodiment, TTL=8.460 mm; EFL=6.242 mm; HFOV=42.184 degrees; ImgH=5.694 mm; Fno=1.700. In particular: 1. the system length of the optical imaging lens TTL in this embodiment is shorter than the system length of the optical imaging lens TTL in the first embodiment; 2. the distortion aberration in this embodiment is smaller than the distortion aberration in the first embodiment.

Ninth Embodiment

Please refer toFIG.22which illustrates the ninth embodiment of the optical imaging lens1of the present invention. Please refer toFIG.23Afor the longitudinal spherical aberration on the image plane4of the ninth embodiment; please refer toFIG.23Bfor the field curvature aberration on the sagittal direction; please refer toFIG.23Cfor the field curvature aberration on the tangential direction, and please refer toFIG.23Dfor the distortion aberration. The components in this embodiment are similar to those in the first embodiment, but the optical data such as the lens element refracting power, the radius of curvature, the lens element thickness, the aspheric surface or the back focal length in this embodiment are different from the optical data in the first embodiment. In addition, in this embodiment, the fifth lens element50has positive refracting power, and an optical axis region56of the image-side surface52of the fifth lens element50is convex.

The optical data of the ninth embodiment of the optical imaging lens are shown inFIG.40while the aspheric surface data are shown inFIG.41. In this embodiment, TTL=8.657 mm; EFL=6.447 mm; HFOV=42.185 degrees; ImgH=6.268 mm; Fno=1.700. In particular: 1. the system length of the optical imaging lens TTL in this embodiment is shorter than the system length of the optical imaging lens TTL in the first embodiment; 2. the field curvature aberration on the sagittal direction in this embodiment is smaller than the field curvature aberration on the sagittal direction in the first embodiment; 3. the field curvature aberration on the tangential direction in this embodiment is smaller than the field curvature aberration on the tangential direction in the first embodiment; 4. the distortion aberration in this embodiment is smaller than the distortion aberration in the first embodiment.

Some important ratios and parameters in each embodiment are shown inFIG.42and inFIG.43.

Each embodiment of the present invention provides an optical imaging lens which has good imaging quality. For example, the design of the surface shapes of the following lens elements or the parameter ratios may have the corresponding advantages:

1. When the optical imaging lens element1of the present invention satisfies that a periphery region37of the image-side surface32of the third lens element30is concave, an optical axis region43of the object-side surface41of the fourth lens element40is concave and a periphery region74of the object-side surface71of the seventh lens element70is concave, it is conducive to design a lens of a large aperture and of a larger image height. The optical imaging lens element1of the present invention may be further limited to that an optical axis region73of the object-side surface71of the seventh lens element70is convex, 2.200≤(T1+D42t72)/(Fno*D12t32) and 115.000≤ν3+ν4+ν5, it is conducive to reduce the system length TTL, and to let the ray transfer in the outer field of view (0.6˜1.0 field of view) become smooth to reduce the sensitivity and to enhance manufacturability. The preferable ranges are 2.200≤(T1+D42t72)/(Fno*D12t32)≤5.000 and 115.000≤ν3+ν4+ν5≤180.000. Wherein, that the fifth lens element50has negative refracting power is conducive to correct the aberration on the 0.0˜0.2 field of view. The optical imaging lens element1of the present invention may be further limited to that the first lens element10has positive refracting power or the second lens element20has negative refracting power, and it is conducive to go with the surface shape limitations of the third lens element30and of the fourth lens element40to correct the spherical aberration.
2. When the optical imaging lens element1of the present invention satisfies that a periphery region37of the image-side surface32of the third lens element30is concave, an optical axis region43of the object-side surface41of the fourth lens element40is concave and a periphery region74of the object-side surface71of the seventh lens element70is concave, it is conducive to design a lens of a large aperture and of a larger image height. The optical imaging lens element1of the present invention may be further limited to that an optical axis region66of the image-side surface62of the sixth lens element60is concave, 1.200≤D32t72/(Fno*D11t32) and 115.000≤ν3+ν4+ν5, it is conducive to reduce the system length TTL, and to let the ray transfer in the outer field of view (0.6˜1.0 field of view) become smooth to reduce the sensitivity and to enhance the manufacturability. The preferable ranges are 1.200≤D32t72/(Fno*D11t32)≤2.700 and 115.000≤ν3+ν4+ν5≤180.000. Wherein, that the fifth lens element50has negative refracting power is conducive to correct the aberration on the inner field of view (0.0˜0.2 field of view). The optical imaging lens element1of the present invention may be further limited to that the first lens element10has positive refracting power or the second lens element20has negative refracting power, and it is conducive to go with the surface shape limitations of the third lens element30and of the fourth lens element40to correct the spherical aberration.
3. When the optical imaging lens element1of the present invention satisfies a periphery region37of the image-side surface32of the third lens element30is concave, an optical axis region43of the object-side surface41of the fourth lens element40is concave and a periphery region74of the object-side surface71of the seventh lens element70is concave, it is conducive to design a lens of a large aperture and of a larger image height. The optical imaging lens element1of the present invention may be further limited to that an optical axis region16of the image-side surface12of the first lens element10is concave, an optical axis region53of the object-side surface51of the fifth lens element50is concave and 2.550≤(T1+D42t72)/(Fno*D12t32), it is conducive to reduce the system length TTL, and to let the ray transfer on the outer field of view (0.6˜1.0 field of view) become smooth to reduce the sensitivity and to enhance the manufacturability. The preferable range is 2.550≤(T1+D42t72)/(Fno*D12t32)≤5.000. Wherein, that the second lens element20has negative refracting power is conducive to correct the aberration on the inner field of view (0.2˜0.4 field of view). The optical imaging lens element1of the present invention may be further limited to that the first lens element10has positive refracting power, and it is conducive to go with the surface shape limitations of the third lens element30and of the fourth lens element40to correct the spherical aberration.
4. When the optical imaging lens element1of the present invention satisfies 80.000≤ν2+ν3+ν5, 80.000≤ν2+ν4+ν5, ν1+ν7≤100.000, ν1+ν3+ν6≤170.000, ν1+ν2≤120.000 or ν1+ν4≤120.00, it is conducive to enhance the modulation transfer function (MTF) of the optical imaging lens element1to increase the resolution. The preferable ranges are respectively 38.000≤ν1+ν7≤100.000, 57.000≤ν1+ν3+ν6≤150.000, 38.000≤ν1+ν2≤100.000 or 38.000≤ν1+ν4≤100.00, and the more preferable range are respectively 80.000≤ν2+ν3+ν5≤180.000, 80.000≤ν2+ν4+ν5≤180.000, 68.000≤ν1+ν7≤100.000, 120.000≤ν1+ν3+ν6≤150.000, 68.000≤ν1+ν2≤100.000 or 68.000≤ν1+ν4≤100.00.
5. If the following conditional formulae are satisfied, it may keep the thicknesses and gaps of each lens element in suitable ranges and from that the parameters are too great to shrink the optical imaging lens or too small to assemble or the difficulty of the fabrication may be increased while it is conducive to provide a small f-number and a large image height:
TTL/AAG≤3.810, and the preferable range is 2.300≤TTL/AAG≤3.810; ALT/(G23+G45+G67)≤3.700, and the preferable range is 1.600≤ALT/(G23+G45+G67)≤3.700; D11t22/G23≤4.100, and the preferable range is 2.200≤D11t22/G23≤4.100;
(D11t22+T3+G34+T4)/G45≤4.700, and the preferable range is 2.100≤(D11t22+T3+G34+T4)/G45≤4.700;
(T5+G56+T6)/G67≤2.500, and the preferable range is 1.100≤(T5+G56+T6)/G67≤2.500;
TL/(AAG+BFL)≤2.000, and the preferable range is 1.500≤TL/(AAG+BFL)≤2.000;
(D11t22+T5)/G23≤10.000, and the preferable range is 3.300≤(D11t22+T5)/G23≤10.000;
(T1+T2+T3+T4+T5)/G45≤4.500, and the preferable range is 1.900≤(T1+T2+T3+T4+T5)/G45≤4.500;
(T5+G56+T6+T7)/G67≤4.000, and the preferable range is 2.000≤(T5+G56+T6+T7)/G67≤4.000;
(G12+T2+T3+T4+T5+G56)*Fno/G67≤4.800, and the preferable range is 2.300≤(G12+T2+T3+T4+T5+G56)*Fno/G67≤4.800;
(D11t22+T4)*Fno/(G23+T3+G34)≤3.000, and the preferable range is 1.400≤(D11t22+T4)*Fno/(G23+T3+G34)≤3.000;
EFL/AAG≤2.700, and the preferable range is 1.800≤EFL/AAG≤2.700;
(T1+T2+T7)/T6≤3.100, and the preferable range is 1.100≤(T1+T2+T7)/T6≤3.100;
(T1+T2+T4+G56)*Fno/T7≤3 0.500, and the preferable range is 1.500≤(T1+T2+T4+G56)*Fno/T7≤3 0.500.

In addition, any arbitrary combination of the parameters of the embodiments can be selected to increase the lens limitation so as to facilitate the design of the same structure of the present invention.

In the ray of the unpredictability of the optical imaging lens, the present invention suggests the above principles to have a shorter system length of the optical imaging lens, a larger aperture available, enhanced imaging quality or better assembly yield to overcome the drawbacks of prior art.

In addition to the above ratios, one or more conditional formulae may be optionally combined to be used in the embodiments of the present invention and the present invention is not limit to this. The concave or convex configuration of each lens element or multiple lens elements may be limited additionally to enhance the performance and/or the resolution. The above limitations may be selectively combined in the embodiments without causing inconsistency.

The numerical ranges including the maximum values and minimum values obtained by the combination ratio relationship of the optical parameters disclosed in the various embodiments of the present invention can be implemented accordingly.

The contents in the embodiments of the invention include but are not limited to a focal length, a thickness of a lens element, an Abbe number, or other optical parameters. For example, in the embodiments of the invention, an optical parameter A and an optical parameter B are disclosed, wherein the ranges of the optical parameters, comparative relation between the optical parameters, and the range of a conditional expression covered by a plurality of embodiments are specifically explained as follows:

(1) The ranges of the optical parameters are, for example, α2≤A≤α1or β2≤A≤β1, where α1is a maximum value of the optical parameter A among the plurality of embodiments, α2is a minimum value of the optical parameter A among the plurality of embodiments, β1is a maximum value of the optical parameter B among the plurality of embodiments, and β2is a minimum value of the optical parameter B among the plurality of embodiments.
(2) The comparative relation between the optical parameters is that A is greater than B or A is less than B, for example.
(3) The range of a conditional expression covered by a plurality of embodiments is in detail a combination relation or proportional relation obtained by a possible operation of a plurality of optical parameters in each same embodiment. The relation is defined as E, and E is, for example, A+B or A−B or A/B or A*B or (A*B)1/2, and E satisfies a conditional expression E≤γ1or E≤γ2or γ2≤E≤γ1, where each of γ1and γ2is a value obtained by an operation of the optical parameter A and the optical parameter B in a same embodiment, γ1is a maximum value among the plurality of the embodiments, and γ2is a minimum value among the plurality of the embodiments.

The ranges of the aforementioned optical parameters, the aforementioned comparative relations between the optical parameters, and a maximum value, a minimum value, and the numerical range between the maximum value and the minimum value of the aforementioned conditional expressions are all implementable and all belong to the scope disclosed by the invention. The aforementioned description is for exemplary explanation, but the invention is not limited thereto.

The embodiments of the invention are all implementable. In addition, a combination of partial features in a same embodiment can be selected, and the combination of partial features can achieve the unexpected result of the invention with respect to the prior art. The combination of partial features includes but is not limited to the surface shape of a lens element, a refracting power, a conditional expression or the like, or a combination thereof. The description of the embodiments is for explaining the specific embodiments of the principles of the invention, but the invention is not limited thereto. Specifically, the embodiments and the drawings are for exemplifying, but the invention is not limited thereto.