Optical imaging lens

Abstract

An optical imaging lens comprises, sequentially from the object side to the image side along an optical axis, a first, a second, a third, a fourth, a fifth, a sixth, and a seventh lens, each lens including an object-side surface and an image-side surface. The first lens has a concave region on its image-side surface along the optical axis. The third lens has a convex region on its image-side surface along the optical axis. The fourth lens has a convex region on its object-side surface along the optical axis, a concave region on its object-side surface, and a concave region on its image-side surface along the optical axis. The fifth lens has a concave region on its image-side surface along the optical axis.

Description

Technical Field

[0001] This invention relates to an optical element, and more particularly to an optical imaging lens. Prior Technology

[0002] The specifications of consumer electronics products are constantly evolving, and the pursuit of thinner and smaller designs has never slowed down. Therefore, key components of electronic products, such as optical lenses, must continuously improve in terms of specifications to meet consumer demands. The most important characteristics of optical lenses are image quality and size; in addition, features such as improved field of view and wider aperture are becoming increasingly important. Regarding image quality, with the advancement of image sensing technology, consumers' requirements for image quality will also increase. Therefore, in the field of optical lens design, in addition to pursuing lens thinness, it is also necessary to consider lens image quality and performance.

[0003] However, optical lens design is not simply a matter of scaling down a high-quality lens to create one that combines image quality with miniaturization. The design process involves not only material properties but also practical production considerations such as manufacturing and assembly yield. In particular, the technical difficulty of miniaturized lenses is significantly higher than that of traditional lenses. Therefore, how to manufacture optical lenses that meet the needs of consumer electronics products and continuously improve their image quality has long been a goal that industry, government, and academia in this field have been striving to achieve. Summary of the Invention

[0004] This invention provides an optical imaging lens with good optical performance and a large half field of view.

[0005] An embodiment of the present invention provides an optical imaging lens, comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each lens has an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes. The optical imaging lens comprises only the aforementioned seven lenses. The first lens has a concave optical axis region on its image-side surface. The third lens has a convex circumferential region on its image-side surface. The fourth lens has a convex optical axis region on its object-side surface, a concave circumferential region on its object-side surface, and a concave optical axis region on its image-side surface. The fifth lens has a concave optical axis region on its image-side surface.

[0006] Another embodiment of the present invention provides an optical imaging lens, comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each lens has an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes. The optical imaging lens has only the aforementioned seven lenses. The first lens has a concave optical axis region on its image-side surface. The third lens has a convex circumferential region on its image-side surface. The fourth lens has a concave circumferential region on its object-side surface, and also a concave optical axis region on its image-side surface. The fifth lens has a concave optical axis region on its image-side surface. The seventh lens has a concave circumferential region on its object-side surface.

[0007] Another embodiment of the present invention provides an optical imaging lens, comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each lens has an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes. The optical imaging lens has only the aforementioned seven lenses. The first lens has a concave optical axis region on its image-side surface. The third lens has a negative refractive index, and a convex circular region on its image-side surface. The fourth lens has a concave optical axis region on its image-side surface. The fifth lens has a concave optical axis region on its image-side surface.

[0008] Another embodiment of the present invention provides an optical imaging lens, comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each lens has an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes. The optical imaging lens has only the aforementioned seven lenses. The first lens has a concave optical axis region on its image-side surface. The third lens has a concave optical axis region on its image-side surface, and a convex circumferential region on its image-side surface. The fourth lens has a concave optical axis region on its image-side surface. The fifth lens has a concave optical axis region on its image-side surface.

[0009] Based on the above, the beneficial effects of the optical imaging lens of the embodiment of the present invention are as follows: by controlling the design of the arrangement of the concave and convex surfaces of the lenses, the optical imaging lens of the embodiment of the present invention can achieve good optical performance and expand the field of view.

[0010] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation. Simple Explanation of the Diagram

[0011] Figure 1 is a schematic diagram illustrating the surface structure of a lens. Figure 2 is a schematic diagram illustrating the concave-convex structure of a lens and the focal point of light rays. Figure 3 is a schematic diagram illustrating the surface structure of a lens in Example 1. Figure 4 is a schematic diagram illustrating the surface structure of a lens in Example 2. Figure 5 is a schematic diagram illustrating the surface structure of a lens in Example 3. Figure 6 is a schematic diagram of the optical imaging lens of the first embodiment of the present invention. Figures 7A to 7D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the first embodiment. Figure 8 shows detailed optical data of the optical imaging lens of the first embodiment of the present invention. Figure 9 shows the aspherical parameters of the optical imaging lens of the first embodiment of the present invention. Figure 10 is a schematic diagram of the optical imaging lens of the second embodiment of the present invention. Figures 11A to 11D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the second embodiment. Figure 12 shows detailed optical data of the optical imaging lens of the second embodiment of the present invention. Figure 13 shows the aspherical parameters of the optical imaging lens of the second embodiment of the present invention. Figure 14 is a schematic diagram of the optical imaging lens of the third embodiment of the present invention. Figures 15A to 15D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the third embodiment. Figure 16 shows detailed optical data of the optical imaging lens of the third embodiment of the present invention. Figure 17 shows the aspherical parameters of the optical imaging lens of the third embodiment of the present invention. Figure 18 is a schematic diagram of the optical imaging lens of the fourth embodiment of the present invention. Figures 19A to 19D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the fourth embodiment. Figure 20 shows detailed optical data of the optical imaging lens of the fourth embodiment of the present invention. Figure 21 shows the aspherical parameters of the optical imaging lens of the fourth embodiment of the present invention. Figure 22 is a schematic diagram of the optical imaging lens of the fifth embodiment of the present invention. Figures 23A to 23D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the fifth embodiment. Figure 24 shows detailed optical data of the optical imaging lens of the fifth embodiment of the present invention. Figure 25 shows the aspherical parameters of the optical imaging lens of the fifth embodiment of the present invention. Figure 26 is a schematic diagram of the optical imaging lens of the sixth embodiment of the present invention. Figures 27A to 27D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the sixth embodiment. Figure 28 shows detailed optical data of the optical imaging lens of the sixth embodiment of the present invention. Figure 29 shows the aspherical parameters of the optical imaging lens of the sixth embodiment of the present invention. Figure 30 is a schematic diagram of the optical imaging lens of the seventh embodiment of the present invention. Figures 31A to 31D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the seventh embodiment. Figure 32 shows detailed optical data of the optical imaging lens of the seventh embodiment of the present invention. Figure 33 shows the aspherical parameters of the optical imaging lens of the seventh embodiment of the present invention. Figure 34 is a schematic diagram of the optical imaging lens of the eighth embodiment of the present invention. Figures 35A to 35D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the eighth embodiment. Figure 36 shows detailed optical data of the optical imaging lens of the eighth embodiment of the present invention. Figure 37 shows the aspherical parameters of the optical imaging lens of the eighth embodiment of the present invention. Figures 38 and 39 show the numerical values ​​of various important parameters and their relationships of the optical imaging lenses of the first to fourth embodiments of the present invention. Figures 40 and 41 show the numerical values ​​of various important parameters and their relationships of the optical imaging lenses of the fifth to eighth embodiments of the present invention. Implementation

[0012] The optical system described in this specification includes at least one lens that receives imaging rays incident on the optical system, ranging from parallel to the optical axis to within a half-field of view (HFOV) angle relative to the optical axis. The imaging rays are imaged on an imaging plane by the optical system. The phrase "a lens has a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens, calculated using Gaussian optics theory, is positive (or negative). The phrase "object-side (or image-side) of the lens" is defined as the specific range through which the imaging rays pass on the lens surface. The imaging rays include at least two types of rays: the chief ray (Lc) and the marginal ray (Lm) (as shown in Figure 1). The object-side (or image-side) of the lens can be divided into different regions depending on its location, including the optical axis region, the circumferential region, or one or more relay regions in some embodiments, which will be described in detail below.

[0013] Figure 1 is a radial sectional view of lens 100. Two reference points are defined on the surface of lens 100: a center point and a transition point. The center point of the lens surface is the intersection of the surface with the optical axis I. As illustrated in Figure 1, the first center point CP1 is located on the object-side surface 110 of lens 100, and the second center point CP2 is located on the image-side surface 120 of lens 100. A transition point is a point on the lens surface whose tangent is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the outermost radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, if a single lens surface has multiple transition points, these transition points are named sequentially from the first transition point in the radially outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (as shown in Figure 4), and the Nth transition point (farthest from the optical axis I).

[0014] The region from the center point to the first conversion point TP1 is defined as the optical axis region, which includes the center point. The region radially outward from the Nth conversion point farthest from the optical axis I to the optical boundary OB is defined as the circumferential region. In some embodiments, a relay region may be additionally included between the optical axis region and the circumferential region; the number of relay regions depends on the number of conversion points.

[0015] When a ray parallel to optical axis I passes through a region, if the ray bends towards optical axis I and the intersection point with optical axis I is located on the image side A2 of the lens, then that region is a convex surface. When a ray parallel to optical axis I passes through a region, if the extension of the ray intersects optical axis I at the object side A1 of the lens, then that region is a concave surface.

[0016] In addition, referring to Figure 1, lens 100 may also include an assembly portion 130 extending radially outward from optical boundary OB. Assembly portion 130 is generally used for assembling lens 100 to a corresponding element (not shown) in an optical system. Imaging rays do not reach assembly portion 130. The structure and shape of assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. Assembly portion 130 of the lens discussed below may be partially or entirely omitted in the figures.

[0017] Referring to Figure 2, the region between the center point CP and the first conversion point TP1 is defined as the optical axis region Z1. The region between the first conversion point TP1 and the optical boundary OB of the lens surface is defined as the circumferential region Z2. As shown in Figure 2, after passing through the optical axis region Z1, the parallel ray 211 intersects the optical axis I on the image side A2 of the lens 200, meaning the focal point of the parallel ray 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the ray intersects the optical axis I on the image side A2 of the lens 200, the optical axis region Z1 is convex. Conversely, the parallel ray 212 diverges after passing through the circumferential region Z2. As shown in Figure 2, the extension line EL of the parallel ray 212 after passing through the circumferential region Z2 intersects the optical axis I on the object side A1 of the lens 200, meaning the focal point of the parallel ray 212 passing through the circumferential region Z2 is located at point M on the object side A1 of the lens 200. Since the extension line EL of the light ray intersects the optical axis I at the object side A1 of the lens 200, the circumferential region Z2 is concave. In the lens 200 shown in Figure 2, the first conversion point TP1 is the boundary between the optical axis region and the circumferential region, that is, the first conversion point TP1 is the boundary point between the convex surface and the concave surface.

[0018] On the other hand, the convexity / concavity of the optical axis region can also be determined using the method commonly used by those knowledgeable in the field: judging the convexity / concavity of the lens's optical axis region by the sign of the paraxial radius of curvature (R value). The R value is commonly used in optical design software, such as Zemax or CodeV. It is also frequently found in lens data sheets within optical design software. For the object-side, a positive R value indicates a convex optical axis region, while a negative R value indicates a concave optical axis region. Conversely, for the image-side, a positive R value indicates a concave optical axis region, while a negative R value indicates a convex optical axis region. This method yields results consistent with the aforementioned method using the intersection of a ray / ray extension with the optical axis, where the focal point of a ray parallel to the optical axis is located on either the object-side or image-side of the lens to determine the convexity / concavity. The terms "a region is convex (or concave)," "a region is convex (or concave)," or "a convex (or concave) region" used in this specification may be used interchangeably.

[0019] Figures 3 to 5 provide examples of determining the surface shape and region boundaries of the lens region in various situations, including the aforementioned optical axis region, circumferential region, and relay region.

[0020] Figure 3 is a radial sectional view of lens 300. Referring to Figure 3, the image-side surface 320 of lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis region Z1 and the circumferential region Z2 of the image-side surface 320 of lens 300 are shown in Figure 3. The R value of this image-side surface 320 is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0021] Generally, the surface shape of each region bounded by the transition point will be opposite to that of the adjacent region. Therefore, the transition point can be used to define the change in surface shape, that is, from the transition point, the surface changes from concave to convex or from convex to concave. In Figure 3, since the optical axis region Z1 is concave, and the surface shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0022] Figure 4 is a radial sectional view of lens 400. Referring to Figure 4, the object-side surface 410 of lens 400 has a first conversion point TP1 and a second conversion point TP2. The area between the optical axis I and the first conversion point TP1 is defined as the optical axis region Z1 of the object-side surface 410. The R value of this object-side surface 410 is positive (i.e., R>0), therefore, the optical axis region Z1 is a convex surface.

[0023] The area between the second conversion point TP2 and the optical boundary OB of the object side surface 410 of the lens 400 is defined as a circular region Z2, which is also a convex surface. In addition, the area between the first conversion point TP1 and the second conversion point TP2 is defined as a relay region Z3, which is also a concave surface. Referring again to Figure 4, the object side surface 410, radially outward from the optical axis I, sequentially includes the optical axis region Z1 between the optical axis I and the first conversion point TP1, the relay region Z3 between the first conversion point TP1 and the second conversion point TP2, and the circular region Z2 between the second conversion point TP2 and the optical boundary OB of the object side surface 410 of the lens 400. Since the optical axis region Z1 is convex, and its surface shape changes from the first conversion point TP1 to concave, the relay region Z3 is concave. Furthermore, its surface shape changes back to convex from the second conversion point TP2, so the circular region Z2 is convex.

[0024] Figure 5 is a radial sectional view of lens 500. The object-side surface 510 of lens 500 has no transition point. For a lens surface without a transition point, such as the object-side surface 510 of lens 500, the optical axis region is defined as 0-50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and the circumferential region is defined as 50-100% of the distance from the optical axis I to the optical boundary OB of the lens surface. Referring to the lens 500 shown in Figure 5, the optical axis region Z1 of the object-side surface 510 is defined as 50% of the distance from the optical axis I to the optical boundary OB of the lens surface. The R value of this object-side surface 510 is positive (i.e., R>0), therefore, the optical axis region Z1 is convex. Since the object-side surface 510 of lens 500 has no transition point, the circumferential region Z2 of the object-side surface 510 is also convex. Lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0025] Figure 6 is a schematic diagram of the optical imaging lens of the first embodiment of the present invention, and Figures 7A to 7D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the first embodiment. Referring to Figure 6, the optical imaging lens 10 of the first embodiment of the present invention includes, from the object side A1 to the image side A2, an aperture 0, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an IR cut filter 9 in sequence along an optical axis I of the optical imaging lens 10. When light emitted from an object to be photographed enters the optical imaging lens 10 and passes through the aperture 0, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the filter 9 in sequence, an image is formed on an image plane 99. The filter 9 is disposed between the seventh lens 7 and the image plane 99. It should be noted that the object side A1 is the side facing the object to be photographed, while the image side A2 is the side facing the image plane 99.

[0026] In this embodiment, the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7, and filter 9 of the optical imaging lens 10 each have an object-side surface 15, 25, 35, 45, 55, 65, 75, 95 facing the object side A1 and allowing imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 66, 76, 96 facing the image side A2 and allowing imaging light to pass through. In this embodiment, the aperture 0 is placed in front of the first lens 3.

[0027] The first lens 1 has a positive refractive index. The first lens 1 is made of plastic. An optical axis region 151 of the object-side surface 15 of the first lens 1 is convex, and a circumferential region 153 of the object-side surface 15 of the first lens 1 is convex. An optical axis region 162 of the image-side surface 16 of the first lens 1 is concave, and a circumferential region 163 of the image-side surface 16 of the first lens 1 is convex. In this embodiment, both the object-side surface 15 and the image-side surface 16 of the first lens 1 are aspherical surfaces.

[0028] The second lens 2 has a negative refractive index. The second lens 2 is made of plastic. One optical axis region 251 of the object-side surface 25 of the second lens 2 is convex, and another circumferential region 253 of the object-side surface 25 of the second lens 2 is convex. One optical axis region 262 of the image-side surface 26 of the second lens 2 is concave, and another circumferential region 264 of the image-side surface 26 of the second lens 2 is concave. In this embodiment, both the object-side surface 25 and the image-side surface 26 of the second lens 2 are aspherical.

[0029] The third lens 3 has a negative refractive index. The third lens 3 is made of plastic. A convex region 351 of the object-side surface 35 of the third lens 3 is convex, and a concave region 354 of the object-side surface 35 is concave. A concave region 362 of the image-side surface 36 of the third lens 3 is concave, and a convex region 363 of the image-side surface 36 is convex. In this embodiment, both the object-side surface 35 and the image-side surface 36 of the third lens 3 are aspherical.

[0030] The fourth lens 4 has a positive refractive index. The fourth lens 4 is made of plastic. A convex region 451 of the object-side surface 45 of the fourth lens 4 is convex, and a concave region 454 of the object-side surface 45 is concave. A concave region 462 of the image-side surface 46 of the fourth lens 4 is concave, and a convex region 463 of the image-side surface 46 is convex. In this embodiment, both the object-side surface 45 and the image-side surface 46 of the fourth lens 4 are aspherical.

[0031] The fifth lens 5 has a negative refractive index. The fifth lens 5 is made of plastic. One optical axis region 551 of the object-side surface 55 of the fifth lens 5 is convex, and one circumferential region 554 of the object-side surface 55 of the fifth lens 5 is concave. One optical axis region 562 of the image-side surface 56 of the fifth lens 5 is concave, and one circumferential region 563 of the image-side surface 56 of the fifth lens 5 is convex. In this embodiment, both the object-side surface 55 and the image-side surface 56 of the fifth lens 5 are aspherical.

[0032] The sixth lens 6 has a positive refractive index. The sixth lens 6 is made of plastic. A convex region 651 of the object-side surface 65 of the sixth lens 6 is convex, and a concave region 654 of the object-side surface 65 is concave. A convex region 661 of the image-side surface 66 of the sixth lens 6 is convex, and a convex region 663 of the image-side surface 66 is convex. In this embodiment, both the object-side surface 65 and the image-side surface 66 of the sixth lens 6 are aspherical.

[0033] The seventh lens 7 has a negative refractive index. The seventh lens 7 is made of plastic. A axial region 752 of the object-side surface 75 of the seventh lens 7 is concave, and a circumferential region 754 of the object-side surface 75 of the seventh lens 7 is concave. A axial region 762 of the image-side surface 76 of the seventh lens 7 is concave, and a circumferential region 763 of the image-side surface 76 of the seventh lens 7 is convex. In this embodiment, both the object-side surface 75 and the image-side surface 76 of the seventh lens 7 are aspherical.

[0034] In this embodiment, only the seven lenses mentioned above have refractive power.

[0035] Other detailed optical data of the first embodiment are shown in Figure 8. The system length of the optical imaging lens 10 of the first embodiment is 6.463 mm, the overall system focal length (EFL) is 5.045 mm, the half angle of view is 34.340°, the image height is 3.500 mm, and the aperture value (F-number, Fno) is 1.580. The system length refers to the distance from the object side surface 15 of the first lens 1 to the imaging surface 99 on the optical axis I.

[0036] Furthermore, in this embodiment, the object-side surfaces 15, 25, 35, 45, 55, 65, and 75, and the image-side surfaces 16, 26, 36, 46, 56, 66, and 76 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, and seventh lens 7, totaling fourteen surfaces, are all general even-order aspherical surfaces. These aspherical surfaces are defined according to the following formula: -----------(1) Y: The distance between a point on the aspherical curve and the optical axis; Z: Depth of the aspherical surface; (The perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis and a tangent plane at the vertex on the optical axis of the aspherical surface); R: Radius of curvature of the lens surface; K: Conic coefficient; a2i: The i-th order aspherical coefficient.

[0037] The aspherical coefficients of the object-side surface 15 of the first lens 1 to the image-side surface 76 of the seventh lens 7 in formula (1) are shown in Figure 9. In Figure 9, column number 15 indicates that it is the aspherical coefficient of the object-side surface 15 of the first lens 1, and the other columns are deduced in the same way.

[0038] In addition, the relationship between the important parameters in the optical imaging lens 10 of the first embodiment is shown in Figures 38 and 39. In Figure 38, the units of the parameters in the columns T1 to GFP and EFL to TTL are all millimeters (mm). in, V1 is the Abbe value of the first lens 1; V2 is the Abbe value of the second lens 2; V3 is the Abbe value of the third lens 3; V4 is the Abbe value of the fourth lens 4; V5 is the Abbe value of the fifth lens, 5. V6 is the Abbe value of the sixth lens, 6. V7 is the Abbe value of the seventh lens, 7. T1 is the center thickness of the first lens 1 on the optical axis I; T2 is the center thickness of the second lens 2 on the optical axis I; T3 is the center thickness of the third lens 3 on optical axis I; T4 is the center thickness of the fourth lens 4 on optical axis I; T5 is the center thickness of the fifth lens 5 on optical axis I; T6 is the center thickness of the sixth lens 6 on optical axis I; T7 is the center thickness of the seventh lens 7 on optical axis I; G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I; G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I; G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I; G45 is the air gap between the fourth lens 4 and the fifth lens 5 on optical axis I; G56 is the air gap between the fifth lens 5 and the sixth lens 6 on the optical axis I; G67 is the air gap between the sixth lens 6 and the seventh lens 7 on the optical axis I; G7F is the air gap between the seventh lens 7 and the filter 9 on the optical axis I; TF is the center thickness of filter 9 on optical axis I; GFP represents the air gap between filter 9 and imaging plane 99 on optical axis I. AAG is the sum of the six air gaps along optical axis I from lens 1 to lens 7, namely the sum of gaps G12, G23, G34, G45, G56 and G67; ALT is the sum of the center thicknesses of the seven lenses from lens 1 to lens 7 on optical axis I, namely the sum of the center thicknesses of T1, T2, T3, T4, T5, T6, and T7; EFL is the effective focal length of the optical imaging lens 10; BFL is the distance on optical axis I from the image side surface 76 of the seventh lens 7 to the imaging surface 99 of the optical imaging lens 10; TTL is the distance on optical axis I from the object surface 15 of the first lens 1 to the imaging surface 99 of the optical imaging lens 10; TL is the distance on optical axis I from the object-side surface 15 of the first lens 1 to the image-side surface 76 of the seventh lens 7; and HFOV is the half-angle of the optical imaging lens 10.

[0039] Referring in conjunction with Figures 7A to 7D, Figure 7A illustrates the longitudinal spherical aberration of the first embodiment when its pupil radius is 1.5967 mm. Figures 7B and 7C illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging plane 99 of the first embodiment when its wavelengths are 470 nm, 555 nm, and 650 nm, respectively. Figure 7D illustrates the distortion aberration on the imaging plane 99 of the first embodiment when its wavelengths are 470 nm, 555 nm, and 650 nm. In Figure 7A, a diagram illustrating the longitudinal spherical aberration of this first embodiment, the curves formed by each wavelength are very close and move towards the center, indicating that off-axis rays at different heights for each wavelength are concentrated near the imaging point. The skewing of the curves for each wavelength shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.025 mm. Therefore, this first embodiment significantly improves the spherical aberration of the same wavelength. In addition, the distances between the three representative wavelengths are also quite close, indicating that the imaging positions of rays representing different wavelengths are quite concentrated, thus significantly improving chromatic aberration.

[0040] In the field curvature aberration diagrams of Figures 7B and 7C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.025 mm, indicating that the optical system of this first embodiment can effectively eliminate aberrations. The distortion aberration diagram in Figure 7D shows that the distortion aberration of this first embodiment is maintained within ±2.5%, indicating that the distortion aberration of this first embodiment meets the imaging quality requirements of the optical system. Therefore, this first embodiment, compared to existing optical lenses, still provides good imaging quality even with a system length shortened to approximately 6.463 mm.

[0041] Figure 10 is a schematic diagram of the optical imaging lens of the second embodiment of the present invention, while Figures 11A to 11D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the second embodiment. Referring first to Figure 10, a second embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different, and: a circumferential region 564 of the image-side surface 56 of the fifth lens 5 is concave. It should be noted that, for clearer display, the labels of the optical axis region and circumferential region that are the same as in the first embodiment are omitted in Figure 10.

[0042] The detailed optical data of the optical imaging lens 10 of the second embodiment is shown in Figure 12. The system length of the optical imaging lens 10 of the second embodiment is 6.657 mm, the overall system focal length is 4.918 mm, the half angle of view (HFOV) is 33.570°, the image height is 3.500 mm, and the aperture value (Fno) is 1.582.

[0043] As shown in Figure 13, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in the second embodiment are represented in formula (1).

[0044] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the second embodiment are shown in Figures 38 and 39.

[0045] In Figure 11A, the longitudinal spherical aberration diagram of the second embodiment with a pupil radius of 1.5565 mm shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.017 mm. In the field curvature aberration diagrams of Figures 11B and 11C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.05 mm. The distortion aberration diagram in Figure 11D shows that the distortion aberration of the second embodiment is maintained within ±8.0%. This indicates that the second embodiment is easier to manufacture than the first embodiment, thus resulting in a higher yield.

[0046] As can be seen from the above description, the longitudinal spherical aberration of the second embodiment is smaller than that of the first embodiment.

[0047] Figure 14 is a schematic diagram of the optical imaging lens of the third embodiment of the present invention, while Figures 15A to 15D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the third embodiment. Referring first to Figure 14, a third embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different. It should be noted that, for clearer illustration, the labels of the optical axis and circumferential regions that are the same as in the first embodiment are omitted in Figure 14.

[0048] The detailed optical data of the optical imaging lens 10 of the third embodiment is shown in Figure 16. The system length of the optical imaging lens 10 of the third embodiment is 6.609 mm, the overall system focal length is 4.928 mm, the half angle of view (HFOV) is 34.561°, the image height is 3.500 mm, and the aperture value (Fno) is 1.583.

[0049] As shown in Figure 17, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in the third embodiment are represented in formula (1).

[0050] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the third embodiment are shown in Figures 38 and 39.

[0051] In Figure 15A, the longitudinal spherical aberration diagram of this third embodiment with a pupil radius of 1.5597 mm shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.02 mm. In the field curvature aberration diagrams of Figures 15B and 15C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.045 mm. The distortion aberration diagram in Figure 15D shows that the distortion aberration of this third embodiment is maintained within ±3.2%. This indicates that this third embodiment is easier to manufacture than the first embodiment, and therefore has a higher yield.

[0052] As can be seen from the above description, the half-angle of view in the third embodiment is larger than that in the first embodiment. The longitudinal spherical aberration in the third embodiment is smaller than that in the first embodiment.

[0053] Figure 18 is a schematic diagram of the optical imaging lens of the fourth embodiment of the present invention, while Figures 19A to 19D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the fourth embodiment. Referring first to Figure 18, a fourth embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different. It should be noted that, for clearer visualization, the labels of the optical axis and circumferential regions that are the same as in the first embodiment are omitted in Figure 18.

[0054] The detailed optical data of the optical imaging lens 10 of the fourth embodiment is shown in Figure 20. The system length of the optical imaging lens 10 of the fourth embodiment is 6.526 mm, the overall system focal length is 5.145 mm, the half angle of view (HFOV) is 34.006°, the image height is 3.500 mm, and the aperture value (Fno) is 1.581.

[0055] As shown in Figure 21, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in the fourth embodiment are represented in formula (1).

[0056] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the fourth embodiment are shown in Figures 38 and 39.

[0057] In Figure 19A, the longitudinal spherical aberration diagram of this fourth embodiment with a pupil radius of 1.6284 mm shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.035 mm. In the two field curvature aberration diagrams in Figures 19B and 19C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.045 mm. The distortion aberration diagram in Figure 19D shows that the distortion aberration of this fourth embodiment is maintained within ±2.0%. Therefore, this fourth embodiment is easier to manufacture than the first embodiment, and thus has a higher yield.

[0058] As can be seen from the above description, the distortion in the fourth embodiment is less than that in the first embodiment.

[0059] Figure 22 is a schematic diagram of the optical imaging lens of the fifth embodiment of the present invention, while Figures 23A to 24D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the fifth embodiment. Referring first to Figure 22, a fifth embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different, and the third lens 3 has a positive refractive index. It should be noted that, for the sake of clear display, the labels of the optical axis region and the circumferential region that are the same as those in the first embodiment are omitted in Figure 22.

[0060] The detailed optical data of the optical imaging lens 10 of the fifth embodiment is shown in Figure 24. The system length of the optical imaging lens 10 of the fifth embodiment is 6.535 mm, the overall system focal length is 5.044 mm, the half angle of view (HFOV) is 34.375°, the image height is 3.500 mm, and the aperture value (Fno) is 1.581.

[0061] As shown in Figure 25, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in the fifth embodiment are represented in formula (1).

[0062] In addition, the relationship between the important parameters in the optical imaging lens 10 of the fifth embodiment is shown in Figures 40 and 41. In Figure 40, the units of the parameters in the columns T1 to GFP and EFL to TTL are all millimeters (mm).

[0063] In Figure 23A, the longitudinal spherical aberration diagram of this fifth embodiment with a pupil radius of 1.5963 mm shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.028 mm. In the field curvature aberration diagrams of Figures 23B and 23C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.03 mm. The distortion aberration diagram in Figure 23D shows that the distortion aberration of this fifth embodiment is maintained within ±2.0%. Therefore, this fifth embodiment is easier to manufacture than the first embodiment, and thus has a higher yield.

[0064] As can be seen from the above description, the half-angle of the fifth embodiment is larger than that of the first embodiment. The distortion of the fifth embodiment is smaller than that of the first embodiment.

[0065] Figure 26 is a schematic diagram of the optical imaging lens of the sixth embodiment of the present invention, and Figures 27A to 27D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the sixth embodiment. Referring first to Figure 26, a sixth embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different, and: a circumferential region 564 of the image side surface 56 of the fifth lens 5 is concave. It should be noted that, for the sake of clear display, the labels of the optical axis region and the circumferential region that are the same as those in the first embodiment are omitted in Figure 26.

[0066] The detailed optical data of the optical imaging lens 10 of the sixth embodiment is shown in Figure 28. The system length of the optical imaging lens 10 of the sixth embodiment is 6.609 mm, the overall system focal length is 4.909 mm, the half angle of view (HFOV) is 35.096°, the image height is 3.500 mm, and the aperture value (Fno) is 1.584.

[0067] As shown in Figure 29, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in the sixth embodiment are represented in formula (1).

[0068] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the sixth embodiment are shown in Figures 40 and 41.

[0069] In Figure 27A, the longitudinal spherical aberration diagram of this sixth embodiment with a pupil radius of 1.5536 mm shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.015 mm. In the two field curvature aberration diagrams in Figures 27B and 27C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.035 mm. The distortion aberration diagram in Figure 27D shows that the distortion aberration of this sixth embodiment is maintained within ±2.5%. This indicates that this sixth embodiment is easier to manufacture than the first embodiment, and therefore has a higher yield.

[0070] As can be seen from the above description, the half-angle of view in the sixth embodiment is larger than that in the first embodiment. The longitudinal spherical aberration in the sixth embodiment is smaller than that in the first embodiment.

[0071] Figure 30 is a schematic diagram of the optical imaging lens of the seventh embodiment of the present invention, while Figures 31A to 31D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the seventh embodiment. Referring first to Figure 30, a seventh embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different. It should be noted that, for clearer illustration, the labels of the optical axis and circumferential regions that are the same as in the first embodiment are omitted in Figure 30.

[0072] The detailed optical data of the optical imaging lens 10 of the seventh embodiment is shown in Figure 32. The system length of the optical imaging lens 10 of the seventh embodiment is 6.303 mm, the overall system focal length is 4.951 mm, the half angle of view (HFOV) is 34.675°, the image height is 3.500 mm, and the aperture value (Fno) is 1.587.

[0073] As shown in Figure 33, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in formula (1) are the values ​​of each item.

[0074] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the seventh embodiment are shown in Figures 40 and 41.

[0075] In Figure 31A, the longitudinal spherical aberration diagram of this seventh embodiment with a pupil radius of 1.5667 mm shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.018 mm. In the two field curvature aberration diagrams in Figures 31B and 31C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.035 mm. The distortion aberration diagram in Figure 31D shows that the distortion aberration of this seventh embodiment is maintained within ±3.0%. Therefore, this seventh embodiment, compared to the first embodiment, still provides good imaging quality even with a system length reduced to approximately 6.303 mm.

[0076] As can be seen from the above description, the half-angle of view in the seventh embodiment is larger than that in the first embodiment. The longitudinal spherical aberration in the seventh embodiment is smaller than that in the first embodiment.

[0077] Figure 34 is a schematic diagram of the optical imaging lens of the eighth embodiment of the present invention, while Figures 35A to 35D are diagrams of longitudinal spherical aberration and various aberrations of the optical imaging lens of the eighth embodiment. Referring first to Figure 34, an eighth embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, and 7 are more or less different. It should be noted that, for clearer visualization, the labels of the optical axis and circumferential regions that are the same as in the first embodiment are omitted in Figure 34.

[0078] The detailed optical data of the optical imaging lens 10 of the eighth embodiment is shown in Figure 36. The system length of the optical imaging lens 10 of the eighth embodiment is 6.458 mm, the overall system focal length is 5.002 mm, the half angle of view (HFOV) is 34.558°, the image height is 3.500 mm, and the aperture value (Fno) is 1.581.

[0079] As shown in Figure 37, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 76 of the seventh lens 7 in the eighth embodiment are represented in formula (1).

[0080] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the eighth embodiment are shown in Figures 40 and 41.

[0081] In Figure 35A, the longitudinal spherical aberration diagram of this eighth embodiment with a pupil radius of 1.5830 mm, shows that the imaging point deviation of off-axis rays at different heights is controlled within ±0.025 mm. In the two field curvature aberration diagrams in Figures 35B and 35C, the focal length variation of the three representative wavelengths across the entire field of view falls within ±0.025 mm. The distortion aberration diagram in Figure 35D shows that the distortion aberration of this eighth embodiment is maintained within ±2.5%. Therefore, this eighth embodiment, compared to the first embodiment, still provides good imaging quality even with a system length reduced to approximately 6.458 mm.

[0082] As can be seen from the above description, the system length of the eighth embodiment is less than that of the first embodiment. The half-angle of view of the eighth embodiment is greater than that of the first embodiment.

[0083] In order to shorten the length of the lens system and ensure image quality, reducing the air gap between the lenses or appropriately shortening the lens thickness is one of the means of this embodiment. However, considering the ease of manufacturing, a better configuration can be achieved if the following conditional numerical limits are met. The optical imaging lens 10 can meet the requirements of (T2+T3+T4+T5+T7) / T2≦6.800, with a preferred range of 5.000≦(T2+T3+T4+T5+T7) / T2≦6.800; The optical imaging lens 10 can meet the requirements of (T1+T4+T5) / G23≦4.000, with a preferred range of 2.500≦(T1+T4+T5) / G23≦4.000; The optical imaging lens 10 can meet the requirement of ALT / T1≦4.500, with a preferred range of 3.400≦ALT / T1≦4.500; The optical imaging lens 10 can conform to AAG / T7≦3.700, with a preferred range of 2.400≦AAG / T7≦3.700; The optical imaging lens 10 can meet the requirement of AAG / (G23+T2)≦2.500, with a preferred range of 1.700≦AAG / (G23+T2)≦2.500; The optical imaging lens 10 can meet the condition ALT / (G12+G34+G45+G56)≦9.500, with a better range of 5.300≦ALT / (G12+G34+G45+G56)≦9.500; The optical imaging lens 10 can meet the requirements of (G23+G67) / T3≦3.500, with a preferred range of 2.100≦(G23+G67) / T3≦3.500; The optical imaging lens 10 can meet the requirements of (T2+T4+T6) / G67≦3.600, with a preferred range of 3.000≦(T2+T4+T6) / G67≦3.600; The optical imaging lens 10 can meet the requirements of ALT / G67≦7.200, with a preferred range of 6.000≦ALT / G67≦7.200; The optical imaging lens 10 can meet the condition ALT / (T1+T3+T5)≦2.600, with a preferred range of 2.000≦ALT / (T1+T3+T5)≦2.600; The optical imaging lens 10 can conform to AAG / G67≦3.200, with a preferred range of 2.200≦AAG / G67≦3.200; The optical imaging lens 10 can meet the requirement of AAG / (T2+T3)≦2.800, with a preferred range of 1.700≦AAG / (T2+T3)≦2.800; The optical imaging lens 10 can meet the requirements of BFL / G67≦2.800, with a preferred range of 1.000≦BFL / G67≦2.800; The optical imaging lens 10 can meet EFL / T6≦4.700, with a preferred range of 3.000≦EFL / T6≦4.700.

[0084] To ensure that the ratio of optical element parameters to lens length in the optical imaging lens 10 is maintained at an appropriate value, avoiding the disadvantage of excessively small parameters in manufacturing or excessively large parameters that would result in an excessively long lens, a better configuration can be achieved if the following conditional numerical constraints are met. The optical imaging lens 10 can meet the requirement of TTL / (T1+T6)≦3.500, with a preferred range of 2.400≦TTL / (T1+T6)≦3.500; The optical imaging lens 10 can meet the requirements of TTL / (G23+G67)≦7.200, with a preferred range of 5.200≦TTL / (G23+G67)≦7.200; The optical imaging lens 10 can meet the requirements of TTL / (T3+T5+T6)≦4.000, with a preferred range of 2.800≦TTL / (T3+T5+T6)≦4.000; The optical imaging lens 10 can conform to TL / G67≦10.200, with a preferred range of 8.400≦TL / G67≦10.200; The optical imaging lens 10 can meet the condition TL / (T1+T7)≦4.200, with a preferred range of 3.300≦TL / (T1+T7)≦4.200.

[0085] Furthermore, any combination of parameters in the selected embodiments can be used to increase lens constraints, thereby facilitating lens design with the same architecture as the present invention. Given the unpredictability of optical system design, under the architecture of the present invention, meeting the above-mentioned conditions can better shorten the lens length, increase the usable aperture, improve image quality, or improve assembly yield, thus overcoming the shortcomings of prior art.

[0086] The exemplary limiting relationships listed above can be selectively combined and applied in varying numbers to embodiments of the present invention, and are not limited thereto. In implementing the present invention, in addition to the aforementioned relationships, further detailed structures such as the arrangement of concave and convex curved surfaces of other lenses can be designed for a single lens or, more broadly, for multiple lenses, to enhance control over system performance and / or resolution. For example, a convex surface located in the optical axis region can be selectively formed additionally on the object-side surface of the first lens. It should be noted that these details should be selectively combined and applied to other embodiments of the present invention without conflict.

[0087] In summary, the optical imaging lens 10 of the embodiments of the present invention can achieve the following effects and advantages:

[0088] I. The longitudinal spherical aberration, astigmatism, and distortion in all embodiments of this invention conform to usage specifications. Furthermore, off-axis light rays of red, green, and blue wavelengths at different heights are all concentrated at the imaging point. The skewing amplitude of each curve shows that the imaging point deviation of off-axis light rays at different heights is controlled, demonstrating excellent spherical aberration, astigmatism, and distortion suppression capabilities. Further review of the imaging quality data reveals that the distances between the red, green, and blue wavelengths are also quite close, indicating that this invention exhibits excellent concentration of different wavelengths of light under various conditions, resulting in superior dispersion suppression capabilities. In summary, this invention, through the design and combination of the aforementioned lenses, can produce excellent imaging quality.

[0089] Second, the second lens 2 has a concave circular region 264 on its image-side surface 26, which, combined with the concave circular region 354 on its object-side surface 35 of the third lens 3, effectively focuses light. Furthermore, the optical imaging lens 10 can be designed to utilize the concave circular region 654 on the object-side surface 65 of the sixth lens 6 and the convex optical axis region 661 on its image-side surface 66, which helps correct aberrations.

[0090] Third, by combining the first lens 1, the third lens 3, and the fourth lens 4, the material of these lenses can meet the condition of -10.000≦V1-(V3+V4), which can shorten the length of the lens system and ensure the image quality. The preferred range of V1-(V3+V4) is -10.000 to 20.000.

[0091] The numerical ranges, including the maximum and minimum values, obtained from the combined proportional relationships of the optical parameters disclosed in the various embodiments of the present invention can all be implemented accordingly.

[0092] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0093] 100, 200, 300, 400, 500: Lenses 15, 25, 35, 45, 55, 65, 75, 95, 110, 410, 510: Side view of the object 16, 26, 36, 46, 56, 66, 76, 96, 120, 320: side view 130: Assembly Department 211, 212: Parallel rays 10: Optical Imaging Lens 0: Aperture 1: First lens 2: Second lens 3: Third lens 4: Fourth Lens 5: Fifth Lens 6: Sixth Lens 7: Seventh Lens 9: Filter 99: Imaging plane 151, 162, 251, 262, 351, 362, 451, 462, 551, 562, 651, 661, 752, 762: Optical axis regions 153, 163, 253, 264, 354, 363, 454, 463, 554, 563, 564, 654, 663, 754, 763: Circular area A1: Object side A2: Image side CP1: First center point CP2: Second center point EL: Extension line I: optical axis Lm: Edge ray OB: Optical boundary R: point TP1: First conversion point TP2: Second conversion point Z1: Optical axis region Z2: Circular area Z3: Relay Area

Claims

1. An optical imaging lens, comprising, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, each lens having an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through, wherein the optical imaging lens has only the aforementioned seven lenses, wherein... The third lens has a convex optical axis region on the object side; the fourth lens has a concave optical axis region on the image side; the fifth lens has a convex optical axis region on the object side; and the seventh lens has a concave optical axis region on the image side. The optical imaging lens satisfies the following conditions: EFL / T6≦4.700; and (T2+T3+T4+T5+T7) / T2≦6.800, where EFL is the effective focal length of the optical imaging lens, T6 is the center thickness of the sixth lens on the optical axis, T2 is the center thickness of the second lens on the optical axis, T3 is the center thickness of the third lens on the optical axis, T4 is the center thickness of the fourth lens on the optical axis, T5 is the center thickness of the fifth lens on the optical axis, and T7 is the center thickness of the seventh lens on the optical axis.

2. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, each lens having an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through. The optical imaging lens contains only these seven lenses. The fourth lens has a concave optical axis region on its image side; the fifth lens has a negative refractive index; the optical imaging lens satisfies the following conditions: EFL / T6≦4.700; and (T2+T3+T4+T5+T7) / T2≦6.800, where EFL is the effective focal length of the optical imaging lens, T6 is the center thickness of the sixth lens on the optical axis, T2 is the center thickness of the second lens on the optical axis, T3 is the center thickness of the third lens on the optical axis, T4 is the center thickness of the fourth lens on the optical axis, T5 is the center thickness of the fifth lens on the optical axis, and T7 is the center thickness of the seventh lens on the optical axis.

3. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, each lens having an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through. The optical imaging lens contains only these seven lenses. The second lens has a negative refractive index; the optical axis region of the image side of the fourth lens is concave; the optical imaging lens satisfies the following conditions: EFL / T6≦4.700; and (T2+T3+T4+T5+T7) / T2≦6.800, where EFL is the effective focal length of the optical imaging lens, T6 is the center thickness of the sixth lens on the optical axis, T2 is the center thickness of the second lens on the optical axis, T3 is the center thickness of the third lens on the optical axis, T4 is the center thickness of the fourth lens on the optical axis, T5 is the center thickness of the fifth lens on the optical axis, and T7 is the center thickness of the seventh lens on the optical axis.

4. The optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: (T1+T4+T5) / G23≦4.000, where, T1 is the center thickness of the first lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

5. The optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens conforms to the following condition: AAG / T7 ≤ 3.700, where, AAG is the sum of the six air gaps on the optical axis from the first lens to the seventh lens.

6. The optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: AAG / (G23+T2)≦2.500, where, AAG is the sum of the six air gaps on the optical axis from the first lens to the seventh lens, and G23 is the air gap on the optical axis from the second lens to the third lens.

7. The optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: TTL / (T3+T5+T6)≦4.000, where, TTL is the distance on the optical axis from the object side of the first lens to an imaging surface of the optical imaging lens.

8. The optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: (G23+G67) / T3≦3.500, where, G23 is the air gap between the second lens and the third lens on the optical axis, and G67 is the air gap between the sixth lens and the seventh lens on the optical axis.

9. An optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: (T2+T4+T6) / G67≦3.600, where, G67 is the air gap between the sixth lens and the seventh lens on the optical axis.

10. The optical imaging lens according to any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: ALT / (T1+T3+T5)≦2.600, where, ALT is the sum of the center thicknesses of the seven lenses from the first lens to the seventh lens on the optical axis, and T1 is the center thickness of the first lens on the optical axis.

11. The optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens satisfies the following condition: AAG / (T2+T3)≦2.800, where, AAG is the sum of the six air gaps on the optical axis from the first lens to the seventh lens.

12. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, each lens having an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through, wherein the optical imaging lens has only the aforementioned seven lenses. The third lens has a convex optical axis region on the object side; the fourth lens has a concave optical axis region on the image side; the fifth lens has a convex optical axis region on the object side; the seventh lens has a concave circumferential region on the object side; the seventh lens has a concave optical axis region on the image side; the optical imaging lens satisfies the following condition: EFL / T6≦4.700, where EFL is the effective focal length of the optical imaging lens, and T6 is the center thickness of the sixth lens on the optical axis.

13. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: V1 - (V3 + V4) ≥ -10.000, where, V1 is the Abbe value of the first lens, V3 is the Abbe value of the third lens, and V4 is the Abbe value of the fourth lens.

14. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: ALT / T1 ≤ 4.500, where, ALT is the sum of the center thicknesses of the seven lenses from the first lens to the seventh lens on the optical axis, and T1 is the center thickness of the first lens on the optical axis.

15. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: TTL / (G23+G67)≦7.200, where, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical imaging lens, G23 is the air gap on the optical axis between the second lens and the third lens, and G67 is the air gap on the optical axis between the sixth lens and the seventh lens.

16. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: TL / G67 ≤ 10.200, where, TL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens, and G67 is the air gap on the optical axis between the sixth lens and the seventh lens.

17. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: ALT / (G12+G34+G45+G56)≦9.500, where, ALT is the sum of the center thicknesses of the seven lenses from the first lens to the seventh lens on the optical axis, G12 is the air gap from the first lens to the second lens on the optical axis, G34 is the air gap from the third lens to the fourth lens on the optical axis, G45 is the air gap from the fourth lens to the fifth lens on the optical axis, and G56 is the air gap from the fifth lens to the sixth lens on the optical axis.

18. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: ALT / G67 ≤ 7.200, where, ALT is the sum of the center thicknesses of the seven lenses from the first lens to the seventh lens on the optical axis, and G67 is the air gap between the sixth lens and the seventh lens on the optical axis.

19. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: AAG / G67 ≤ 3.200, where, AAG is the sum of the six air gaps on the optical axis from the first lens to the seventh lens, and G67 is the air gap on the optical axis from the sixth lens to the seventh lens.

20. The optical imaging lens as claimed in any one of claims 1 to 3 and 12, wherein the optical imaging lens satisfies the following condition: BFL / G67 ≤ 2.800, where, BFL is the distance on the optical axis from the image side of the seventh lens to an imaging surface of the optical imaging lens, and G67 is the air gap on the optical axis between the sixth and seventh lenses.

Images