Optical imaging lens

Abstract

This invention discloses an optical imaging lens, comprising six lenses sequentially along the optical axis from the object side to the image side. The first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the object side of the second lens is convex, the optical axis region of the object side of the third lens is convex, the optical axis region of the object side of the fourth lens is convex, the circumferential region of the image side of the fourth lens is convex, and the optical axis region of the image side of the sixth lens is concave. The optical imaging lens has only these six lenses, and satisfies TL / EFL≦2.900, (T5+T6) / T1≦2.500, and TTL / (T5+G56+T6)≧6.500. The optical imaging lens is small in size and has a small aperture value, a large field of view, and good image quality.

Description

[0001] This invention patent application is a divisional application. The original application number is 202010504458.6, the application date is June 5, 2020, and the invention title is: Optical Imaging Lens. Technical Field

[0002] This invention relates to the field of optical imaging, and more particularly to an optical imaging lens. Background Technology

[0003] In recent years, optical imaging lenses have continued to evolve, and their applications have become more extensive. In addition to requiring lenses to be lightweight, thin, and compact, a small aperture value (Fno) is beneficial for increasing light throughput, and a large field of view is also gradually becoming a trend. Therefore, how to design an optical imaging lens that is both lightweight and compact, with a small aperture value, a large field of view, and good image quality has become a challenge and a problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide an optical imaging lens that is small in size and has a small aperture value, a large field of view, and good imaging quality.

[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, and a sixth lens. Each of the first to sixth lenses includes 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 first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the object-side surface of the second lens is convex, the optical axis region of the object-side surface of the third lens is convex, the optical axis region of the object-side surface of the fourth lens is convex, the circumferential region of the image-side surface of the fourth lens is convex, and the optical axis region of the image-side surface of the sixth lens is concave. The optical imaging lens comprises only the above six lenses, and satisfies TL / EFL≦2.900, (T5+T6) / T1≦2.500, and TTL / (T5+G56+T6)≧6.500.

[0006] An embodiment of the present invention provides an optical imaging lens, comprising, sequentially along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the first to sixth lenses includes 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 first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the object-side surface of the third lens is convex, the optical axis region of the object-side surface of the fourth lens is convex, the fifth lens has a negative refractive index, and the circumferential region of the object-side surface of the sixth lens is concave. The optical imaging lens comprises only the aforementioned six lenses, and satisfies (T5+T6) / T1≦2.500 and (T max / T max2 ) / AAG≧1.800.

[0007] An embodiment of the present invention provides an optical imaging lens, comprising, sequentially along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the first to sixth lenses includes 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 first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the object-side surface of the fourth lens is convex, the fifth lens has a negative refractive index, the circumferential region of the image-side surface of the fifth lens is convex, and the circumferential region of the object-side surface of the sixth lens is concave. The optical imaging lens comprises only the aforementioned six lenses, and satisfies (T5+T6) / T1≦2.500 and (T max / T max2 ) / AAG≧1.800.

[0008] An embodiment of the present invention provides an optical imaging lens, comprising, sequentially along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the first to sixth lenses includes 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 first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the object-side surface of the second lens is convex, the optical axis region of the image-side surface of the second lens is convex, and the optical axis region of the object-side surface of the fourth lens is convex. The optical imaging lens comprises only the aforementioned six lenses, and satisfies TL / EFL ≤ 2.900, (T... max / T max2 ) / AAG≧1.800 and (G23+G34+T4) / T5≧2.400.

[0009] An embodiment of the present invention provides an optical imaging lens, comprising, sequentially along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the first to sixth lenses includes 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 first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the image-side surface of the second lens is convex, the optical axis region of the object-side surface of the fourth lens is convex, and the optical axis region of the object-side surface of the fifth lens is concave. The optical imaging lens comprises only the aforementioned six lenses, and satisfies TL / EFL ≤ 2.900, (T... max / T max2 ) / AAG≧1.800 and (G23+G34+T4) / T5≧2.400.

[0010] An embodiment of the present invention provides an optical imaging lens, comprising, from the object side to the image side, sequentially along the optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the first to sixth lenses includes 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 first lens has a negative refractive index, the second lens has a positive refractive index, the optical axis region of the image-side surface of the third lens is concave, the fifth lens has a negative refractive index, the circumferential region of the object-side surface of the sixth lens is concave, and the circumferential region of the image-side surface of the sixth lens is convex. The optical imaging lens comprises only the above six lenses, and satisfies TTL / (T5+G56+T6)≧6.500 and ALT / AAG≧2.700.

[0011] In the optical imaging lens of the present invention, any of the following conditions may be selectively satisfied:

[0012] TTL / (G23+T3+G34)≧9.000

[0013] (T max / T max2 ) / AAG≧1.800,

[0014] TL / EFL ≤ 2.900

[0015] (T1+G12) / T6≦2.600,

[0016] (G23+G34+T4) / T5≧2.400,

[0017] (T1+T2+T4) / BFL≦2.100,

[0018] TTL / (T5+G56+T6)≧6.500,

[0019] ALT / AAG ≥ 2.700

[0020] TL / T max ≤4.300,

[0021] (T1+G12+T2) / T3≧2.800,

[0022] (T5+T6) / T1≦2.500,

[0023] EFL / BFL ≥ 1.300

[0024] TTL / AAG ≥ 4.900

[0025] TL / (G45+T5+G56)≧5.600,

[0026] (T2+T3+T4) / T1≧4.800,

[0027] ALT / (G12+G45)≧4.200,

[0028] T max / T max2 ≥1.500.

[0029] Where T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, and T6 is the thickness of the sixth lens on the optical axis.

[0030] Wherein G12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, G23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, G34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens, G45 is the distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens, and G56 is the distance on the optical axis from the image side of the fifth lens to the object side of the sixth lens.

[0031] Where EFL is the effective focal length of the optical imaging lens, BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane of the optical imaging lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging lens, AAG is the sum of the five air gaps on the optical axis from the first to the sixth lens, TL is the distance on the optical axis from the object side of the first lens to the image side of the sixth lens, ALT is the sum of the lens thicknesses on the optical axis from the first to the sixth lens, and T... max T represents the thickest lens thickness along the optical axis for lenses one through six. max2 The first to sixth lenses are the lenses with the second thickest thickness on this optical axis.

[0032] Based on the above, the beneficial effects of the optical imaging lens of the embodiments of the present invention are as follows: by combining the above-mentioned refractive index, surface shape and thickness, the optical imaging lens is small in size and has a small aperture value, a large field of view and good imaging quality. Attached Figure Description

[0033] Figure 1 This is a schematic diagram illustrating the surface structure of a lens.

[0034] Figure 2 It is a schematic diagram illustrating the concave and convex structure of a lens and the intersection of light rays.

[0035] Figure 3 This is a schematic diagram illustrating the surface structure of a lens in Example 1.

[0036] Figure 4 This is a schematic diagram illustrating the surface structure of a lens in Example 2.

[0037] Figure 5 This is a schematic diagram illustrating the surface structure of a lens in Example 3.

[0038] Figure 6 This is a schematic diagram of the optical imaging lens according to the first embodiment of the present invention.

[0039] Figure 7 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the first embodiment.

[0040] Figure 8 This is a detailed optical data table diagram of the optical imaging lens of the first embodiment of the present invention.

[0041] Figure 9 This is a table of aspherical parameters of the optical imaging lens according to the first embodiment of the present invention.

[0042] Figure 10 This is a schematic diagram of the optical imaging lens according to the second embodiment of the present invention.

[0043] Figure 11 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the second embodiment.

[0044] Figure 12 This is a detailed optical data table diagram of the optical imaging lens according to the second embodiment of the present invention.

[0045] Figure 13 This is a table of aspherical parameters of the optical imaging lens according to the second embodiment of the present invention.

[0046] Figure 14 This is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention.

[0047] Figure 15 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the third embodiment.

[0048] Figure 16 This is a detailed optical data table diagram of the optical imaging lens according to the third embodiment of the present invention.

[0049] Figure 17 This is a table of aspherical parameters of the optical imaging lens according to the third embodiment of the present invention.

[0050] Figure 18 This is a schematic diagram of an optical imaging lens according to the fourth embodiment of the present invention.

[0051] Figure 19 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the fourth embodiment.

[0052] Figure 20 This is a detailed optical data table diagram of the optical imaging lens according to the fourth embodiment of the present invention.

[0053] Figure 21 This is a table of aspherical parameters of the optical imaging lens according to the fourth embodiment of the present invention.

[0054] Figure 22 This is a schematic diagram of an optical imaging lens according to the fifth embodiment of the present invention.

[0055] Figure 23 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the fifth embodiment.

[0056] Figure 24 This is a detailed optical data table diagram of the optical imaging lens according to the fifth embodiment of the present invention.

[0057] Figure 25 This is a table of aspherical parameters of the optical imaging lens according to the fifth embodiment of the present invention.

[0058] Figure 26 This is a schematic diagram of an optical imaging lens according to the sixth embodiment of the present invention.

[0059] Figure 27 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the sixth embodiment.

[0060] Figure 28 This is a detailed optical data table diagram of the optical imaging lens according to the sixth embodiment of the present invention.

[0061] Figure 29 This is a table of aspherical parameters of the optical imaging lens according to the sixth embodiment of the present invention.

[0062] Figure 30 This is a schematic diagram of an optical imaging lens according to the seventh embodiment of the present invention.

[0063] Figure 31 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the seventh embodiment.

[0064] Figure 32 This is a detailed optical data table diagram of the optical imaging lens according to the seventh embodiment of the present invention.

[0065] Figure 33 This is a table of aspherical parameters of the optical imaging lens according to the seventh embodiment of the present invention.

[0066] Figure 34 This is a schematic diagram of the optical imaging lens according to the eighth embodiment of the present invention.

[0067] Figure 35 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the eighth embodiment.

[0068] Figure 36 This is a detailed optical data table diagram of the optical imaging lens according to the eighth embodiment of the present invention.

[0069] Figure 37 This is a table of aspherical parameters of the optical imaging lens according to the eighth embodiment of the present invention.

[0070] Figure 38 This is a schematic diagram of an optical imaging lens according to the ninth embodiment of the present invention.

[0071] Figure 39 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the ninth embodiment.

[0072] Figure 40 This is a detailed optical data table diagram of the optical imaging lens according to the ninth embodiment of the present invention.

[0073] Figure 41 This is a table of aspherical parameters of the optical imaging lens according to the ninth embodiment of the present invention.

[0074] Figure 42 This is a schematic diagram of an optical imaging lens according to the tenth embodiment of the present invention.

[0075] Figure 43 This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical imaging lens in the tenth embodiment.

[0076] Figure 44 This is a detailed optical data table diagram of the optical imaging lens according to the tenth embodiment of the present invention.

[0077] Figure 45 This is a table of aspherical parameters of the optical imaging lens according to the tenth embodiment of the present invention.

[0078] Figure 46 This is a numerical table of important parameters and their relationships of the optical imaging lens of the first to fifth embodiments of the present invention.

[0079] Figure 47 These are numerical tables and graphs showing the important parameters and their relationships of the optical imaging lenses of the sixth to tenth embodiments of the present invention.

[0080] Figure 48 This is a numerical table of important parameters and their relationships of the optical imaging lens of the first to fifth embodiments of the present invention.

[0081] Figure 49 These are numerical tables and graphs showing the important parameters and their relationships of the optical imaging lenses of the sixth to tenth embodiments of the present invention. Detailed Implementation

[0082] Before describing the invention in detail, the symbols in the accompanying drawings are clearly explained: 0: aperture; 1: first lens; 2: second lens; 3: third lens; 4: fourth lens; 5: fifth lens; 6: sixth lens; 9: filter; 10: optical imaging lens; 15, 25, 35, 45, 55, 65, 95, 110, 410, 510: object side; 16, 26, 36, 46, 56, 66, 96, 120, 320: image side; 99: imaging plane; 100, 200, 300, 400, 500: lens; 130: assembly part; 151, 162, 251, 261, 35 1, 361, 451, 461, 552, 561, 651, 662, Z1: Optical axis region; 153, 164, 253, 263, 353, 363, 453, 463, 554, 563, 654, 663, Z2: Circumferential region; 211, 212: Parallel rays; A1: Object side; A2: Image side; CP: Center point; CP1: First center point; CP2: Second center point; EL: Extension line; I: Optical axis; Lm: Edge ray; Lc: Principal ray; M, R: Intersection point; OB: Optical boundary; TP1: First conversion point; TP2: Second conversion point; Z3: Relay region.

[0083] The terms "optical axis region," "circumferential region," "concave surface," and "convex surface" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0084] The optical system described in this specification includes at least one lens that receives imaging rays incident on the optical system from parallel to the optical axis to within a half-angle (HFOV) relative to the optical axis. The imaging rays pass through the optical system and form an image on the imaging plane. The statement "a lens has a positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens, calculated using Gaussian optics theory, is positive (or negative). The statement "the 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: principal rays (Lc) and marginal rays (Lm) (e.g., ...). Figure 1 (As shown). The object side (or image side) of the lens can be divided into different regions depending on the 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.

[0085] Figure 1 This 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 this surface and the optical axis I. For example... Figure 1As illustrated, 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. Furthermore, if a single lens surface has multiple transition points, these transition points are named sequentially from the first transition point in a radially outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (as shown in the example), and the third transition point TP2 (as shown in the example) are named sequentially from the first transition point in a radially outward direction. Figure 4 (as shown) and the Nth conversion point (farthest from optical axis I).

[0086] 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.

[0087] 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.

[0088] In addition, see Figure 1 The lens 100 may also include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 to a corresponding element (not shown) in an optical system. Imaging rays do not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. The assembly portion 130 of the lens discussed below may be partially or entirely omitted in the drawings.

[0089] See Figure 2 Define the region between the center point CP and the first conversion point TP1 as the optical axis region Z1. Define the region between the first conversion point TP1 and the optical boundary OB of the lens surface as the circumferential region Z2. For example... Figure 2 As shown, parallel ray 211 intersects optical axis I at the image side A2 of lens 200 after passing through optical axis region Z1. That is, the focal point of parallel ray 211 passing through optical axis region Z1 is located at point R on the image side A2 of lens 200. Since the ray intersects optical axis I at the image side A2 of lens 200, optical axis region Z1 is convex. Conversely, parallel ray 212 diverges after passing through circular region Z2. Figure 2As shown, the extension EL of parallel ray 212 after passing through the circular region Z2 intersects the optical axis I at the object side A1 of the lens 200. That is, the focal point of parallel ray 212 after passing through the circular region Z2 is located at point M on the object side A1 of the lens 200. Since the extension EL of the ray intersects the optical axis I at the object side A1 of the lens 200, the circular region Z2 is concave. Figure 2 In the lens 200 shown, 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.

[0090] 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.

[0091] Figures 3 to 5 Examples of determining the surface shape and boundaries of the lens region in various situations are provided, including the aforementioned optical axis region, circumferential region, and relay region.

[0092] Figure 3 This is a radial sectional view of lens 300. See also... 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 circumferential region Z2 of the image-side surface 320 of lens 300 are as follows... Figure 3 As shown. The R value of the side surface 320 of this image is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0093] Generally, the surface shape of each region bounded by a transition point will be opposite to that of its adjacent regions. Therefore, the transition point can be used to define the change in surface shape, i.e., from the transition point, a surface changes from concave to convex or from convex to concave. Figure 3 In the middle, since the optical axis region Z1 is concave and the surface shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0094] Figure 4 This is a radial sectional view of lens 400. See also... 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.

[0095] 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 circumferential region Z2, which is also a convex surface. Furthermore, 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. See again. 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 located between the first conversion point TP1 and the second conversion point TP2, and the circumferential 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 to concave from the first conversion point TP1, the relay region Z3 is concave. Furthermore, its surface shape changes to convex again from the second conversion point TP2, so the circumferential region Z2 is convex.

[0096] Figure 5 This 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% to 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% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface. See also Figure 5 The lens 500 shown defines the optical axis region Z1 of the object-side surface 510 as 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 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 the lens 500 has no transition point, the circumferential region Z2 of the object-side surface 510 is also convex. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0097] Figure 6 This is a schematic diagram of the optical imaging lens according to the first embodiment of the present invention. Figure 7 A to Figure 7 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the first embodiment. Please refer to [the diagram]. Figure 6The optical imaging lens 10 of the first embodiment of the present invention includes, sequentially along an optical axis I from the object side A1 to the image side A2, a first lens 1, an aperture 0, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a filter 9. When light emitted from an object to be photographed enters the optical imaging lens 10 and passes through the first lens 1, aperture 0, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, and filter 9, an image is formed on an image plane 99. It should be noted that the object side is the side facing the object to be photographed, and the image side is the side facing the image plane 99.

[0098] The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the filter 9 each have an object-side surface 15, 25, 35, 45, 55, 65, 95 facing the object side and allowing imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 66, 96 facing the image side and allowing imaging light to pass through.

[0099] The first lens 1 has a negative refractive index. The first lens 1 is made of plastic. The optical axis region 151 of the object-side surface 15 of the first lens 1 is convex, and its circumferential region 153 is also convex. The optical axis region 162 of the image-side surface 16 of the first lens 1 is concave, and its circumferential region 164 is also concave. In this embodiment, both the object-side surface 15 and the image-side surface 16 of the first lens 1 are aspherical surfaces, but the present invention is not limited thereto.

[0100] The second lens 2 has a positive refractive index. The second lens 2 is made of plastic. The optical axis region 251 of the object-side surface 25 of the second lens 2 is convex, and its circumferential region 253 is also convex. The optical axis region 261 of the image-side surface 26 of the second lens 2 is convex, and its circumferential region 263 is also convex. In this embodiment, both the object-side surface 25 and the image-side surface 26 of the second lens 2 are aspherical, but the invention is not limited thereto.

[0101] The third lens 3 has a negative refractive index. The third lens 3 is made of plastic. The optical axis region 351 of the object-side surface 35 of the third lens 3 is convex, and its circumferential region 353 is concave. The optical axis region 361 of the image-side surface 36 of the third lens 3 is concave, and its circumferential region 363 is concave. In this embodiment, both the object-side surface 35 and the image-side surface 36 of the third lens 3 are aspherical, but the present invention is not limited thereto.

[0102] The fourth lens 4 has a positive refractive index. The fourth lens 4 is made of plastic. The optical axis region 451 of the object-side surface 45 of the fourth lens 4 is convex, and its circumferential region 453 is also convex. The optical axis region 461 of the image-side surface 46 of the fourth lens 4 is convex, and its circumferential region 463 is also convex. In this embodiment, both the object-side surface 45 and the image-side surface 46 of the fourth lens 4 are aspherical, but the invention is not limited thereto.

[0103] The fifth lens 5 has a negative refractive index. The fifth lens 5 is made of plastic. The optical axis region 552 of the object-side surface 55 of the fifth lens 5 is concave, and its circumferential region 554 is also concave. The optical axis region 561 of the image-side surface 56 of the fifth lens 5 is convex, and its circumferential region 563 is also convex. In this embodiment, both the object-side surface 55 and the image-side surface 56 of the fifth lens 5 are aspherical, but the invention is not limited thereto.

[0104] The sixth lens 6 has a negative refractive index. The sixth lens 6 is made of plastic. The optical axis region 651 of the object-side surface 65 of the sixth lens 6 is convex, and its circumferential region 654 is concave. The optical axis region 662 of the image-side surface 66 of the sixth lens 6 is concave, and its circumferential region 663 is convex. In this embodiment, both the object-side surface 65 and the image-side surface 66 of the sixth lens 6 are aspherical, but the invention is not limited thereto.

[0105] In this first embodiment, the optical imaging lens 10 has only the above-mentioned six lenses as lenses with refractive power.

[0106] Other detailed optical data for the first embodiment are as follows: Figure 8 As shown, the first embodiment has an overall effective focal length (EFL) of 2.161 mm, a half field of view (HFOV) of 52.995°, an aperture value (f-number, Fno) of 2.200, a system length of 4.576 mm, and an image height of 1.810 mm. The system length refers to the distance along the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 99.

[0107] Furthermore, in this embodiment, the object-side surfaces 15, 25, 35, 45, 55, 65 and the image-side surfaces 16, 26, 36, 46, 56, 66 of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6, totaling twelve surfaces, are aspherical. These aspherical surfaces are defined according to the following formula:

[0108]

[0109] in:

[0110] Y: The distance between a point on the aspherical curve and the optical axis I;

[0111] Z: Depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the optical axis I of the aspherical surface).

[0112] R: Radius of curvature of the lens surface near the optical axis I;

[0113] K: Conic constant;

[0114] a i : The i-th order aspherical coefficient.

[0115] The aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in formula (1) are as follows: Figure 9 As shown. Among them, Figure 9 The field number 11 indicates that it is the aspherical coefficient of the object side surface 15 of the first lens 1, and so on for the other fields. Furthermore, in all embodiments of the present invention, the second-order a2 aspherical coefficient is zero and is therefore omitted.

[0116] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the first embodiment are as follows: Figure 46 , 48 As shown.

[0117] in,

[0118] T1 is the thickness of the first lens 1 on optical axis I; T2 is the thickness of the second lens 2 on optical axis I; T3 is the thickness of the third lens 3 on optical axis I; T4 is the thickness of the fourth lens 4 on optical axis I; T5 is the thickness of the fifth lens 5 on optical axis I; T6 is the thickness of the sixth lens 6 on optical axis I; TF is the thickness of the filter 9 on optical axis I.

[0119] T max T represents the maximum lens thickness along optical axis I for lenses 1 through 6, specifically the maximum values ​​of T1, T2, T3, T4, T5, and T6; T max2 The thickness of the first lens 1 to the sixth lens 6 on the optical axis I is the second thickest lens thickness, that is, the second largest value of T1, T2, T3, T4, T5, and T6;

[0120] G12 is the distance on the optical axis I from the image side 16 of the first lens 1 to the object side 25 of the second lens 2, that is, the air gap between the first lens 1 and the second lens 2 on the optical axis I.

[0121] G23 is the distance on optical axis I from the image side 26 of the second lens 2 to the object side 35 of the third lens 3, that is, the air gap between the second lens 2 and the third lens 3 on optical axis I.

[0122] G34 is the distance on optical axis I from the image side 36 of the third lens 3 to the object side 45 of the fourth lens 4, that is, the air gap between the third lens 3 and the fourth lens 4 on optical axis I.

[0123] G45 is the distance on the optical axis I from the image side 46 of the fourth lens 4 to the object side 55 of the fifth lens 5, that is, the air gap between the fourth lens 4 and the fifth lens 5 on the optical axis I.

[0124] G56 is the distance on optical axis I from the image side 56 of the fifth lens 5 to the object side 65 of the sixth lens 6, that is, the air gap between the fifth lens 5 and the sixth lens 6 on optical axis I.

[0125] G6F is the distance on optical axis I from the image side 66 of the sixth lens 6 to the object side 95 of the filter 9.

[0126] GFP is the distance from the image side 96 of filter 9 to the imaging surface 99 on the optical axis I, that is, the air gap between filter 9 and imaging surface 99 on the optical axis I.

[0127] AAG is the sum of the five air gaps on the optical axis I from the first lens 1 to the sixth lens 6, namely the sum of G12, G23, G34, G45 and G56;

[0128] ALT is the sum of the thicknesses of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6 on the optical axis I, that is, the sum of T1, T2, T3, T4, T5 and T6;

[0129] TTL is the distance on the optical axis I from the object surface 15 to the imaging surface 99 of the first lens 1.

[0130] TL is the distance on optical axis I from the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6.

[0131] BFL is the distance on optical axis I from the image side 66 of the sixth lens 6 to the imaging plane 99.

[0132] HFOV is half the field of view of the optical imaging lens 10;

[0133] EFL is the effective focal length of the optical imaging lens 10;

[0134] ImgH is the image height of the optical imaging lens 10; and

[0135] Fno is the aperture value of the optical imaging lens 10.

[0136] Furthermore, redefine:

[0137] f1 is the focal length of the first lens 1; f2 is the focal length of the second lens 2;

[0138] f3 is the focal length of the third lens 3; f4 is the focal length of the fourth lens 4;

[0139] f5 is the focal length of the fifth lens 5; f6 is the focal length of the sixth lens 6;

[0140] n1 is the refractive index of the first lens 1; n2 is the refractive index of the second lens 2;

[0141] n3 is the refractive index of the third lens 3; n4 is the refractive index of the fourth lens 4;

[0142] n5 is the refractive index of the fifth lens 5; n6 is the refractive index of the sixth lens 6;

[0143] V1 is the Abbe number of the first lens 1, which can also be called the dispersion coefficient; V2 is the Abbe number of the second lens 2.

[0144] V3 is the Abbe coefficient of the third lens 3; V4 is the Abbe coefficient of the fourth lens 4;

[0145] V5 is the Abbe coefficient of the fifth lens 5; V6 is the Abbe coefficient of the sixth lens 6.

[0146] from Figure 46 and Figure 47 It can be seen that among the six lenses 1 to 6 in this first embodiment, the lens with the thickest thickness on the optical axis I is the fourth lens 4 among the first to fourth lenses 1 to 4, and the lens with the second thickest thickness is the second lens 2.

[0147] See also Figure 7 A to Figure 7 D, Figure 7 The diagram of A illustrates the longitudinal spherical aberration of the first embodiment. Figure 7 B and Figure 7 The diagrams for C illustrate the astigmatism aberration in the sagittal and tangential directions on the imaging plane 99 in the first embodiment. Figure 7 The diagram of D illustrates the distortion aberration on the imaging plane 99 in the first embodiment. (Diagram of longitudinal spherical aberration in this first embodiment) Figure 7In A, the curves formed by each wavelength are very close and move towards the center, indicating that off-axis light rays at different heights of each wavelength are concentrated near the imaging point. From the skewing of the curves for each wavelength, it can be seen that the imaging point deviation of off-axis light rays at different heights is controlled within ±0.045mm. Therefore, this embodiment does significantly improve 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 light rays of different wavelengths are quite concentrated, thus significantly improving chromatic aberration.

[0148] exist Figure 7 In the astigmatic aberration diagram of B, the astigmatic aberration in the sagittal direction is ±0.06 mm. Figure 7 In the astigmatic aberration diagram of C, the astigmatic aberration in the meridional direction is ±0.20 mm. This demonstrates that the optical system of this first embodiment can effectively eliminate aberrations. Figure 7 The distortion aberration diagram of D shows that the distortion aberration of the first embodiment is maintained within the range of ±40.0%, indicating that the distortion aberration of the first embodiment meets the imaging quality requirements of the optical system. Therefore, it can be said that the first embodiment can still provide better imaging quality than existing optical lenses, even with the system length shortened to 4.576mm.

[0149] Figure 10 This is a schematic diagram of the optical imaging lens according to the second embodiment of the present invention. Figure 11 A to Figure 11 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the second embodiment. Please refer to [the diagram]. Figure 10 A second embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, except that the optical data, aspherical coefficients, and parameters of lenses 1, 2, 3, 4, 5, and 6 are slightly different. It should be noted that, for clearer illustration, Figure 10 The labels for the optical axis region and the circumferential region that are the same as those in the first embodiment are omitted.

[0150] Detailed optical data of the optical imaging lens 10, such as Figure 12 As shown, the second embodiment has an overall effective focal length of 2.017mm, a half field of view (HFOV) of 52.433°, an aperture value (Fno) of 2.200, a system length of 4.165mm, and an image height of 1.810mm.

[0151] like Figure 13 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the second embodiment are in formula (1).

[0152] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the second embodiment are as follows: Figure 46 ,48 As shown.

[0153] The longitudinal spherical aberration diagram of this second embodiment Figure 11 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.03mm. Figure 11 B and Figure 11 In the two astigmatic aberration diagrams of C, the astigmatic aberration in the sagittal direction is ±0.03 mm, while the astigmatic aberration in the meridional direction is ±0.07 mm. Figure 11 The distortion aberration diagram of D shows that the distortion aberration of this second embodiment is maintained within ±40%. This demonstrates that, compared to existing optical lenses, this second embodiment still provides better image quality even with a system length reduced to 4.165mm.

[0154] As can be seen from the above description, the advantages of the second embodiment compared to the first embodiment are: the system length of the second embodiment is smaller than that of the first embodiment; the aberrations in the sagittal direction of the second embodiment are smaller than those in the sagittal direction of the first embodiment; the aberrations in the meridional direction of the second embodiment are smaller than those in the meridional direction of the first embodiment; and the longitudinal spherical aberration of the second embodiment is smaller than that of the first embodiment.

[0155] Figure 14 This is a schematic diagram of the optical imaging lens according to the third embodiment of the present invention. Figure 15 A to Figure 15 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the third embodiment. Please refer to [the diagram]. Figure 14 A third embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, except that the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, and 6 are slightly different. Furthermore, the fifth lens 5 has a positive refractive index. It should be noted that, for clear visualization of the figures, Figure 14 The labels for the optical axis region and the circumferential region, which are the same as those in the first embodiment, are omitted.

[0156] Detailed optical data of the optical imaging lens 10, such as Figure 16 As shown, the overall effective focal length of the third embodiment is 1.360mm, the half field of view (HFOV) is 53.116°, the aperture value (Fno) is 2.200, the system length is 4.916mm, and the image height is 1.810mm.

[0157] like Figure 17 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the third embodiment are in formula (1).

[0158] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the third embodiment are as follows: Figure 46 , 48 As shown.

[0159] The longitudinal spherical aberration diagram of this third embodiment Figure 15 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.5mm. Figure 15 B and Figure 15 In the two astigmatic aberration diagrams of C, the astigmatic aberration in the sagittal direction is ±0.5mm, while the astigmatic aberration in the meridional direction is ±0.5mm. Figure 15 The distortion aberration diagram of D shows that the distortion aberration of this third embodiment is maintained within ±25%. This demonstrates that, compared to existing optical lenses, this third embodiment still provides better image quality even with a system length reduced to 4.916 mm.

[0160] As can be seen from the above description, the advantages of the third embodiment compared with the first embodiment are: the half-angle of view of the third embodiment is larger than that of the first embodiment; and the distortion aberration of the third embodiment is smaller than that of the first embodiment.

[0161] Figure 18 This is a schematic diagram of the optical imaging lens according to the fourth embodiment of the present invention. Figure 19 A to Figure 19 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the fourth embodiment. Please refer to [the diagram]. Figure 18 A fourth embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, except that the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, and 6 are slightly different, and the circumferential region 353 of the object-side surface 35 of the third lens 3 is convex. It should be noted that, for clearer illustration, Figure 18 The labels for the optical axis region and the circumferential region, which are the same as those in the first embodiment, are omitted.

[0162] Detailed optical data of the optical imaging lens 10, such as Figure 20 As shown, the fourth embodiment has an overall effective focal length of 2.050mm, a half field of view (HFOV) of 47.095°, an aperture value (Fno) of 2.200, a system length of 4.926mm, and an image height of 1.810mm.

[0163] like Figure 21 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in formula (1) are the values ​​of each item.

[0164] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the fourth embodiment are as follows: Figure 46 , 48 As shown.

[0165] The longitudinal spherical aberration diagram of this fourth embodiment Figure 19 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.35mm. Figure 19 B and Figure 19 In the two astigmatic aberration diagrams of C, the astigmatic aberration in the sagittal direction is ±0.35mm, while the astigmatic aberration in the meridional direction is ±0.35mm. Figure 19 The distortion aberration diagram of D shows that the distortion aberration of this fourth embodiment is maintained within ±30%. This demonstrates that, compared to existing optical lenses, this fourth embodiment still provides better image quality even with a system length reduced to 4.926 mm.

[0166] As can be seen from the above description, the advantage of the fourth embodiment compared with the first embodiment is that the distortion aberration of the fourth embodiment is smaller than that of the first embodiment.

[0167] Figure 22 This is a schematic diagram of the optical imaging lens according to the fifth embodiment of the present invention. Figure 23 A to Figure 23 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the fifth embodiment. Please refer to [the diagram]. Figure 22 This fifth embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, except that the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, and 6 are slightly different. It should be noted that, for clearer illustration, Figure 22 The labels for the optical axis region and the circumferential region, which are the same as those in the first embodiment, are omitted.

[0168] Detailed optical data of the optical imaging lens 10, such as Figure 24 As shown, the overall effective focal length of the fifth embodiment is 1.937mm, the half field of view (HFOV) is 55.363°, the aperture value (Fno) is 2.200, the system length is 3.963mm, and the image height is 1.865mm.

[0169] like Figure 25 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the fifth embodiment are in formula (1).

[0170] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the fifth embodiment are as follows: Figure 46 , 48 As shown.

[0171] The longitudinal spherical aberration diagram of this fifth embodiment Figure 23In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.018 mm. Figure 23 B and Figure 23 In the two astigmatic aberration diagrams of C, the astigmatic aberration in the sagittal direction is ±0.02 mm, while the astigmatic aberration in the meridional direction is ±0.08 mm. Figure 23 The distortion aberration diagram of D shows that the distortion aberration of this fifth embodiment is maintained within ±35%. This demonstrates that, compared to existing optical lenses, this fifth embodiment still provides better image quality even with a system length reduced to 3.963 mm.

[0172] As can be seen from the above description, the advantages of the fifth embodiment compared with the first embodiment are as follows: the system length of the fifth embodiment is shorter than that of the first embodiment; the half-angle of view of the fifth embodiment is larger than that of the first embodiment; the longitudinal spherical aberration of the fifth embodiment is smaller than that of the first embodiment; the aberration in the sagittal direction of the fifth embodiment is smaller than that in the sagittal direction of the first embodiment; the aberration in the meridional direction of the fifth embodiment is smaller than that in the meridional direction of the first embodiment; and the distortion aberration of the fifth embodiment is smaller than that in the first embodiment.

[0173] Figure 26 This is a schematic diagram of the optical imaging lens according to the sixth embodiment of the present invention. Figure 27 A to Figure 27 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the sixth embodiment. Please refer to [the diagram]. Figure 26 This invention provides a sixth embodiment of the optical imaging lens 10, which is generally similar to the first embodiment, except that the optical data, aspherical coefficients, and parameters between lenses 1, 2, 3, 4, 5, and 6 are slightly different, and the circumferential region 363 of the image-side surface 36 of the third lens 3 is convex. It should be noted that, for clearer illustration, Figure 26 The labels for the optical axis region and the circumferential region that are the same as those in the first embodiment are omitted.

[0174] Detailed optical data of the optical imaging lens 10, such as Figure 28 As shown, the overall effective focal length of the sixth embodiment is 2.014mm, the half field of view (HFOV) is 55.363°, the aperture value (Fno) is 2.200, the system length is 4.197mm, and the image height is 1.865mm.

[0175] like Figure 29 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in formula (1) are the values ​​of each item.

[0176] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the sixth embodiment are as follows: Figure 47 , 49 As shown.

[0177] The longitudinal spherical aberration diagram of this sixth embodiment Figure 27 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.05mm. Figure 27 B and Figure 27 In the two astigmatic aberration diagrams of C, the astigmatic aberration in the sagittal direction is ±0.10 mm, while the astigmatic aberration in the meridional direction is ±0.10 mm. Figure 27 The distortion aberration diagram of D shows that the distortion aberration of this sixth embodiment is maintained within ±40%. This demonstrates that, compared to existing optical lenses, this sixth embodiment still provides better image quality even with a system length reduced to 4.197 mm.

[0178] As can be seen from the above description, the advantages of the sixth embodiment compared to the first embodiment are: the system length of the sixth embodiment is shorter than that of the first embodiment, and the half-angle of view of the sixth embodiment is larger than that of the first embodiment. The aberrations in the meridional direction of the sixth embodiment are smaller than those in the meridional direction of the first embodiment.

[0179] Figure 30 This is a schematic diagram of the optical imaging lens according to the seventh embodiment of the present invention. Figure 31 A to Figure 31 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the seventh embodiment. Please refer to [the diagram]. 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, and 6 are more or less different. Furthermore, the fifth lens 5 has a positive refractive index. It should be noted that, for clear visualization of the figures, Figure 30 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0180] Detailed optical data of the optical imaging lens 10 in the seventh embodiment are as follows: Figure 32 As shown, the overall effective focal length of the optical imaging lens 10 in the seventh embodiment is 1.671 mm, the half field of view (HFOV) is 55.363°, the aperture value (Fno) is 2.200, the system length is 4.182 mm, and the image height is 1.865 mm.

[0181] like Figure 33 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the seventh embodiment are in formula (1).

[0182] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the seventh embodiment are as follows: Figure 47 , 49 As shown.

[0183] The longitudinal spherical aberration diagram of this seventh implementation. Figure 31 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.035mm. Figure 31 B and Figure 31 In the two-field curvature aberration diagram of C, the astigmatic aberration in the sagittal direction is ±0.04 mm, while the astigmatic aberration in the meridional direction is ±0.09 mm. Figure 31 The distortion aberration diagram of D shows that the distortion aberration of this seventh embodiment is maintained within ±25%. This demonstrates that, compared to existing optical lenses, this seventh embodiment still provides better image quality even with a system length reduced to 4.182 mm.

[0184] As can be seen from the above description: the system length of the seventh embodiment is shorter than that of the first embodiment; the half-angle of view of the seventh embodiment is larger than that of the first embodiment; the longitudinal spherical aberration of the seventh embodiment is smaller than that of the first embodiment; the aberration in the sagittal direction of the seventh embodiment is smaller than that in the sagittal direction of the first embodiment; the aberration in the meridional direction of the seventh embodiment is smaller than that in the meridional direction of the first embodiment; and the distortion aberration of the seventh embodiment is smaller than that in the first embodiment.

[0185] Figure 34 This is a schematic diagram of the optical imaging lens according to the eighth embodiment of the present invention. Figure 35 A to Figure 35 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the eighth embodiment. Please refer to [the diagram]. Figure 30 This is an eighth embodiment of the optical imaging lens 10 of the present invention, which is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses 1, 2, 3, 4, 5, and 6 are more or less different. Furthermore, in this embodiment, the fourth lens 4 has a negative refractive index, and the optical axis region 461 of the image side 46 of the fourth lens 4 is concave. The fifth lens 5 has a positive refractive index. The sixth lens 6 has a positive refractive index. It should be noted that, for clear visualization of the figures, Figure 34 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0186] Detailed optical data of the optical imaging lens 10 of the eighth embodiment are as follows: Figure 36As shown, the overall effective focal length of the optical imaging lens 10 in the eighth embodiment is 1.744 mm, the half field of view (HFOV) is 55.369°, the aperture value (Fno) is 2.200, the system length is 3.703 mm, and the image height is 1.865 mm.

[0187] like Figure 37 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the eighth embodiment are in formula (1).

[0188] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the eighth embodiment are as follows: Figure 47 , 49 As shown.

[0189] The longitudinal spherical aberration diagram of this eighth embodiment Figure 35 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.035mm. Figure 35 B and Figure 35 In the two-field curvature aberration diagram of C, the astigmatic aberration in the sagittal direction is ±0.035mm, while the astigmatic aberration in the meridional direction is ±0.045mm. Figure 35 The distortion aberration diagram of D shows that the distortion aberration of this eighth embodiment is maintained within ±30%. This demonstrates that, compared to existing optical lenses, this eighth embodiment still provides better image quality even with a system length reduced to 3.703 mm.

[0190] As can be seen from the above description: the system length of the eighth embodiment is shorter than that of the first embodiment; the half-angle of view of the eighth embodiment is larger than that of the first embodiment; the longitudinal spherical aberration of the eighth embodiment is smaller than that of the first embodiment; the aberration in the sagittal direction of the eighth embodiment is smaller than that in the sagittal direction of the first embodiment; the aberration in the meridional direction of the eighth embodiment is smaller than that in the meridional direction of the first embodiment; and the distortion aberration of the eighth embodiment is smaller than that in the first embodiment.

[0191] Figure 38 This is a schematic diagram of the optical imaging lens according to the ninth embodiment of the present invention. Figure 39 A to Figure 39 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the ninth embodiment. Please refer to [the diagram]. Figure 38A ninth 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 among lenses 1, 2, 3, 4, 5, and 6 are more or less different. Furthermore, in this embodiment, the third lens 3 has a positive refractive index, and the circumferential region 363 of the image-side surface 36 of the third lens 3 is convex. It should be noted that, for clear visualization of the figures, Figure 38 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0192] Detailed optical data of the optical imaging lens 10 in the ninth embodiment are as follows: Figure 40 As shown, the overall effective focal length of the optical imaging lens 10 in the ninth embodiment is 1.878 mm, the half field of view (HFOV) is 55.363°, the aperture value (Fno) is 2.200, the system length is 4.083 mm, and the image height is 1.865 mm.

[0193] like Figure 41 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the ninth embodiment are in formula (1).

[0194] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the ninth embodiment are as follows: Figure 47 , 49 As shown.

[0195] The longitudinal spherical aberration diagram of this ninth embodiment Figure 39 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.06mm. Figure 39 B and Figure 39 In the two-field curvature aberration diagram of C, the astigmatic aberration in the sagittal direction is ±0.07 mm, while the astigmatic aberration in the meridional direction is ±0.07 mm. Figure 39 The distortion aberration diagram of D shows that the distortion aberration of this ninth embodiment is maintained within ±35%. This demonstrates that, compared to existing optical lenses, this ninth embodiment still provides better image quality even with a system length reduced to 4.083 mm.

[0196] As can be seen from the above description, the system length of the ninth embodiment is shorter than that of the first embodiment, the half-angle of the ninth embodiment is larger than that of the first embodiment, the aberration in the meridional direction of the ninth embodiment is smaller than that in the meridional direction of the first embodiment, and the distortion aberration of the ninth embodiment is smaller than that of the first embodiment.

[0197] Figure 42 This is a schematic diagram of the optical imaging lens according to the tenth embodiment of the present invention. Figure 43 A to Figure 43 D represents the longitudinal spherical aberration and various aberrations of the optical imaging lens in the tenth embodiment. Please refer to [the diagram]. Figure 42 A tenth 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 these lenses 1, 2, 3, 4, 5, and 6 are more or less different. It should be noted that, for clearer illustration, Figure 42 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0198] Detailed optical data of the optical imaging lens 10 of the tenth embodiment are as follows: Figure 44 As shown, the optical imaging lens 10 of the tenth embodiment has an overall effective focal length of 2.022 mm, a half field of view (HFOV) of 49.144°, an aperture value (Fno) of 2.200, a system length of 4.270 mm, and an image height of 1.810 mm.

[0199] like Figure 45 As shown, the aspherical coefficients of the object side 15 of the first lens 1 to the image side 66 of the sixth lens 6 in the tenth embodiment are in formula (1).

[0200] Furthermore, the relationships between the important parameters in the optical imaging lens 10 of the tenth embodiment are as follows: Figure 47 , 49 As shown.

[0201] The longitudinal spherical aberration diagram of this tenth embodiment Figure 43 In A, the imaging point deviation of off-axis rays at different heights is controlled within ±0.05mm. Figure 43 B and Figure 43 In the two-field curvature aberration diagram of C, the astigmatic aberration in the sagittal direction is ±0.05mm, while the astigmatic aberration in the meridional direction is ±0.10mm. Figure 43 The distortion aberration diagram of D shows that the distortion aberration of this tenth embodiment is maintained within ±25%. This demonstrates that, compared to existing optical lenses, this tenth embodiment still provides better image quality even with a system length reduced to 4.270 mm.

[0202] As can be seen from the above description, the system length of the tenth embodiment is shorter than that of the first embodiment, the aberration in the sagittal direction of the tenth embodiment is smaller than that in the sagittal direction of the first embodiment, the aberration in the meridional direction of the tenth embodiment is smaller than that in the meridional direction of the first embodiment, and the distortion aberration of the tenth embodiment is smaller than that of the first embodiment.

[0203] See also Figures 46 to 49The table below shows the optical parameters of the ten embodiments described above. In order to shorten the length of the lens system and ensure image quality, while taking into account the ease of manufacturing, the air gap between the lenses is reduced or the lens thickness is appropriately shortened. If the numerical limits of the following conditional expressions are met, the embodiments of the present invention can have a better configuration.

[0204] In an embodiment of the present invention, the condition TTL / (G23+T3+G34)≧9.000 is satisfied, and more preferably, the condition 9.000≦TTL / (G23+T3+G34)≦12.700 is satisfied.

[0205] In an embodiment of the present invention, it satisfies the condition: (T max +T max2 ) / AAG≧1.800, preferably more so: 1.800≦(T) max +T max2 ) / AAG≦2.500.

[0206] In embodiments of the present invention, the condition TL / EFL≦2.900 is satisfied, and more preferably, 1.400≦TL / EFL≦2.900 is satisfied.

[0207] In an embodiment of the present invention, it satisfies the condition: (T1+G12) / T6≦2.600, and more preferably satisfies: 1.800≦(T1+G12) / T6≦2.600.

[0208] In an embodiment of the present invention, it satisfies the condition: (G23+G34+T4) / T5≧2.400, and more preferably satisfies: 2.400≦(G23+G34+T4) / T5≦7.300.

[0209] In an embodiment of the present invention, it satisfies the condition: (T1+T2+T4) / BFL≦2.100, and more preferably satisfies: 1.100≦(T1+T2+T4) / BFL≦2.100.

[0210] In an embodiment of the present invention, the condition is satisfied: TTL / (T5+G56+T6)≧6.500, and more preferably: 6.500≦TTL / (T5+G56+T6)≦11.000.

[0211] In embodiments of the present invention, the condition is satisfied: ALT / AAG ≥ 2.700, preferably 2.700 ≤ ALT / AAG ≤ 4.500.

[0212] In an embodiment of the present invention, it satisfies the condition: TL / T max ≤4.300, preferably 2.700≤TL / T max≤4.300.

[0213] In an embodiment of the present invention, it satisfies the condition: (T1+G12+T2) / T3≧2.800, and more preferably satisfies: 2.800≦(T1+G12+T2) / T3≦6.400.

[0214] In an embodiment of the present invention, it satisfies the condition: (T5+T6) / T1≦2.500, and more preferably satisfies: 1.300≦(T5+T6) / T1≦2.500.

[0215] In embodiments of the present invention, the condition is satisfied: EFL / BFL ≥ 1.300, and more preferably: 1.300 ≤ EFL / BFL ≤ 2.600.

[0216] In an embodiment of the present invention, the condition TTL / AAG ≥ 4.900 is satisfied, and more preferably, the condition 4.900 ≤ TTL / AAG ≤ 7.100 is satisfied.

[0217] In an embodiment of the present invention, it satisfies the condition: TL / (G45+T5+G56)≧5.600, and more preferably satisfies: 5.600≦TL / (G45+T5+G56)≦16.600.

[0218] In an embodiment of the present invention, it satisfies the condition: (T2+T3+T4) / T1≧4.800, and more preferably satisfies: 4.800≦(T2+T3+T4) / T1≦10.200.

[0219] In an embodiment of the present invention, it satisfies the condition: ALT / (G12+G45)≧4.200, and more preferably satisfies: 4.200≦ALT / (G12+G45)≦5.700.

[0220] In an embodiment of the present invention, it satisfies the condition: T max / T max2 ≥1.500, preferably more suitable: 1.500≦T max / T max2 ≤2.800.

[0221] In addition, any combination of parameters in the alternative embodiments can be selected to increase lens constraints, thereby facilitating lens design with the same architecture as the present invention.

[0222] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the length of the system, expand the field of view, reduce the aperture value, improve the image quality, or improve the assembly yield, thereby improving the shortcomings of the prior art. Furthermore, the use of plastic material for the lens in the embodiments of the present invention can further reduce the weight of the lens and save costs.

[0223] In summary, the optical imaging lens 10 of the embodiments of the present invention can achieve the following effects and advantages:

[0224] First, the longitudinal spherical aberration, astigmatism, and distortion in each embodiment of the present invention all meet the usage specifications. Furthermore, off-axis light rays of the three representative wavelengths (486nm, 586nm, and 656nm) at different heights are all concentrated near 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 three representative wavelengths (486nm, 586nm, and 656nm) are also quite close, indicating that the present invention exhibits excellent dispersion suppression capabilities due to its good concentration of light rays of different wavelengths under various conditions. Therefore, it is evident from the above that the present invention possesses excellent optical performance.

[0225] II. When the optical imaging lens 10 meets the following conditions:

[0226] a. The first lens 1 has a negative refractive index and the optical axis region 151 of the object side 15 of the first lens 1 is convex.

[0227] b. A circumferential region 253 of the object side 25 of the second lens 2 is convex, and an optical axis region 261 of the image side 26 of the second lens 2 is convex.

[0228] c. The optical axis region 351 of the object side surface 35 of the third lens 3 is convex.

[0229] d. The optical axis region 451 of the object side surface 45 of the fourth lens 4 is convex.

[0230] e. One optical axis region 561 of the image side 56 of the fifth lens 5 is convex.

[0231] f. A circular region 663 on the image side 66 of the sixth lens 6 is convex.

[0232] g. The thickness of the first lens 1 to the fourth lens 4 on the optical axis I is the thickest and the second thickest among the six lenses mentioned above. By combining the refractive index, surface shape and thickness, the entire optical lens system can effectively expand the field of view, reduce the lens length and maintain good image quality.

[0233] III. When the optical imaging lens 10 meets the following conditions:

[0234] a. The first lens 1 has a negative refractive index.

[0235] b. An optical axis region 251 of the object side 25 of the second lens 2 is convex, and a circumferential region 263 of the image side 26 of the second lens 2 is convex.

[0236] c. The optical axis region 351 of the object side surface 35 of the third lens 3 is convex.

[0237] d. An optical axis region 451 of the object side 45 of the fourth lens 4 is convex, and a circumferential region 463 of the image side 46 of the fourth lens 4 is convex.

[0238] e. One optical axis region 561 of the image side 56 of the fifth lens 5 is convex.

[0239] f. The thickness of the first lens 1 to the fourth lens 4 on the optical axis I is the thickest and second thickest surface among the six lenses mentioned above.

[0240] Furthermore, it also satisfies one of the following conditions g or h:

[0241] g. The optical axis region 151 of the object side 15 of the first lens 1 is convex.

[0242] h. A circumferential region 153 of the object side surface 15 of the first lens 1 is convex.

[0243] By combining the above-mentioned refractive index, surface shape and thickness, the entire optical lens system can not only effectively expand the field of view, reduce the lens length and maintain good image quality, but also further correct optical system aberrations and reduce distortion aberrations.

[0244] IV. When the optical imaging lens 10 meets the following conditions:

[0245] a. The first lens 1 has a negative refractive index.

[0246] b. The second lens 2 has a positive refractive index.

[0247] c. An optical axis region 351 of the object side surface 35 of the third lens 3 is convex, and a circumferential region 363 of the image side surface 36 of the third lens 3 is concave.

[0248] d. One optical axis region 561 of the image side 56 of the fifth lens 5 is convex.

[0249] e. A circular region 654 of the object side surface 65 of the sixth lens 6 is concave.

[0250] f. The thickness of the first lens 1 to the fourth lens 4 on the optical axis I is the thickest and the second thickest among the six lenses mentioned above.

[0251] g. Satisfies the condition: V4+V5≦80.000.

[0252] Furthermore, it satisfies one of the following conditions h, i, j:

[0253] h. A circumferential region 153 of the object side surface 15 of the first lens 1 is convex.

[0254] i. The optical axis region 162 of the image side 16 of the first lens 1 is concave, and the optical axis region 664 of the image side 66 of the sixth lens 6 is concave.

[0255] j. The circumferential region 563 of the image-side surface 56 of the fifth lens 5 is convex, and the optical axis region 662 of the image-side surface 66 of the sixth lens 6 is concave.

[0256] By satisfying the above-mentioned refractive index, surface shape and thickness combination, while reducing the lens length, it can maintain good image quality, correct optical system aberrations, reduce distortion and improve the chromatic aberration of the optical system. The optimal implementation range for V4+V5 is 68.000≦V4+V5≦80.000.

[0257] 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.

Claims

1. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens comprises an object-side surface facing the object side and passing an imaging light, and an image-side surface facing the image side and passing the imaging light; characterized in that: the first lens has a negative refractive power; the second lens has a positive refractive power, and an optical axis area of the object-side surface of the second lens is convex; an optical axis area of the object-side surface of the third lens is convex; an optical axis area of the object-side surface of the fourth lens is convex, and a circumferential area of the image-side surface of the fourth lens is convex; and an optical axis area of the image-side surface of the sixth lens is concave; wherein the lenses of the optical imaging lens are only the above six lenses; TL is defined as a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T5 is defined as a thickness of the fifth lens on the optical axis, T6 is defined as a thickness of the sixth lens on the optical axis, T1 is defined as a thickness of the first lens on the optical axis, TTL is defined as a distance on the optical axis from the object-side surface of the first lens to an image plane of the optical imaging lens, G56 is defined as a distance on the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens, and satisfies TL / EFL≦2.900, (T5+T6) / T1≦2.500, and TTL / (T5+G56+T6)≧6.

500. The optical imaging lens further satisfies ALT / AAG≧2.700, wherein ALT is a sum of lens thicknesses of the first lens to the sixth lens on the optical axis, and AAG is a sum of five air gaps of the first lens to the sixth lens on the optical axis.

4. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens comprises an object-side surface facing the object side and passing an imaging light, and an image-side surface facing the image side and passing the imaging light; characterized in that: the first lens has a negative refractive power; the second lens has a positive refractive power; an optical axis area of the object-side surface of the third lens is convex; an optical axis area of the object-side surface of the fourth lens is convex; the fifth lens has a negative refractive power; and a circumferential area of the object-side surface of the sixth lens is concave; wherein the lenses of the optical imaging lens are only the above six lenses.

5. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens comprises an object-side surface facing the object side and passing an imaging light, and an image-side surface facing the image side and passing the imaging light; characterized in that: the first lens has a negative refractive power; the second lens has a positive refractive power; ​ ​ ​ ​ 2.The optical imaging lens according to claim 1, characterized in that, ​ 3.The optical imaging lens according to claim 1, wherein, The optical imaging lens further satisfies: (T max / T max2 ) / AAG≧1.800, wherein T max is the thickest lens of the first lens to the sixth lens on the optical axis, T max2 is the second thickest lens of the first lens to the sixth lens on the optical axis, and AAG is a total sum of the five air gaps of the first lens to the sixth lens on the optical axis. ​ ​ ​ ​ ​ ​ ​ ​ T5 is defined as a thickness of the fifth lens on the optical axis, T6 is defined as a thickness of the sixth lens on the optical axis, T1 is defined as a thickness of the first lens on the optical axis, T max T2 is defined as a thickness of the second lens on the optical axis, T3 is defined as a thickness of the third lens on the optical axis, T4 is defined as a thickness of the fourth lens on the optical axis, T max2 T2 is defined as a thickness of the second lens on the optical axis, T3 is defined as a thickness of the third lens on the optical axis, T4 is defined as a thickness of the fourth lens on the optical axis, T max T2 is defined as a thickness of the second lens on the optical axis, T3 is defined as a thickness of the third lens on the optical axis, T4 is defined as a thickness of the fourth lens on the optical axis, T max2 T2 is defined as a thickness of the second lens on the optical axis, T3 is defined as a thickness of the third lens on the optical axis, T4 is defined as a thickness of the fourth lens on the optical axis, T ​ ​ ​ An optical axis region of the object side surface of the fourth lens is convex; The fifth lens has negative refractive power and a circumferential region of the image side surface of the fifth lens is convex; and A circumferential region of the object side surface of the sixth lens is concave; Wherein, the lens of the optical imaging lens is only the above six lenses; T5 is defined as a thickness of the fifth lens on the optical axis, T6 is defined as a thickness of the sixth lens on the optical axis, T1 is defined as a thickness of the first lens on the optical axis, T max T is defined as a lens having a greatest thickness among the first lens to the sixth lens on the optical axis, T max2 AAG is defined as a sum of five air gaps of the first lens to the sixth lens on the optical axis, and satisfies (T5+T6) / T1≦2.500 and (T max / T max2 ) / AAG≧1.

800.

6. The optical imaging lens according to claim 4 or 5, characterized in that, The optical imaging lens further satisfies: TTL / (T5+G56+T6)≧6.500, where TTL is a distance on the optical axis from the object side surface of the first lens to an image plane of the optical imaging lens, and G56 is a distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens.

7. The optical imaging lens according to claim 4 or 5, characterized in that, The optical imaging lens further satisfies: TL / EFL≦2.900, where TL is a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and EFL is an effective focal length of the optical imaging lens.

8. The optical imaging lens according to claim 4 or 5, characterized in that, The optical imaging lens further satisfies: TL / T max ≦ 4.300, where TL is a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens.

9. The optical imaging lens according to claim 4 or 5, characterized in that, The optical imaging lens further satisfies: EFL / BFL≧1.300, where EFL is an effective focal length of the optical imaging lens, and BFL is a distance on the optical axis from the image side surface of the sixth lens to an image plane of the optical imaging lens.

10. The optical imaging lens according to claim 1, 4 or 5, characterized in that, The optical imaging lens further satisfies: (G23+G34+T4) / T5≧2.400, where G23 is a distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, G34 is a distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens, and T4 is a thickness on the optical axis of the fourth lens.

11. The optical imaging lens according to claim 1, 4 or 5, characterized in that, The optical imaging lens further satisfies: (T1+G12+T2) / T3≧2.800, where G12 is a distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens, T2 is a thickness on the optical axis of the second lens, and T3 is a thickness on the optical axis of the third lens.

12. The optical imaging lens according to claim 1, 4 or 5, characterized in that, The optical imaging lens further satisfies: (T1+G12) / T6≦2.600, where G12 is a distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens.

13. The optical imaging lens according to claim 1, 4 or 5, characterized in that, The optical imaging lens further satisfies: (T1+T2+T4) / BFL≦2.100, where T2 is a thickness on the optical axis of the second lens, T4 is a thickness on the optical axis of the fourth lens, and BFL is a distance on the optical axis from the image side surface of the sixth lens to the image plane of the optical imaging lens.

14. The optical imaging lens according to claim 1, 4 or 5, characterized in that, The optical imaging lens satisfies: (T2+T3+T4) / T1≧4.800, where T2 is a thickness on the optical axis of the second lens, T3 is a thickness on the optical axis of the third lens, and T4 is a thickness on the optical axis of the fourth lens.

15. An optical imaging lens sequentially comprising, 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, and a sixth lens, and each of the first lens to the sixth lens comprises an object side surface facing the object side and passing imaging light and an image side surface facing the image side and passing imaging light; characterized in that: The first lens has negative refractive power; The second lens has positive refractive power, an on-axis region of the object side surface of the second lens is convex, and an on-axis region of the image side surface of the second lens is convex. An on-axis region of the object side surface of the fourth lens is convex. The optical imaging lens has only the six lenses. TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max2 TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max2 TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T 16. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens comprises an object side surface facing the object side and passing imaging light and an image side surface facing the image side and passing imaging light, characterized in that: The first lens has negative refractive power. The second lens has positive refractive power and an on-axis region of the image side surface of the second lens is convex. An on-axis region of the object side surface of the fourth lens is convex. An on-axis region of the object side surface of the fifth lens is concave. The optical imaging lens has only the six lenses. TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max2 TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T max2 TL is defined as a distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, EFL is defined as an effective focal length of the optical imaging lens, T 17. The optical imaging lens according to claim 15 or 16, characterized in that, The optical imaging lens further satisfies (T1+G12) / T6≦2.600, where T1 is a thickness of the first lens on the optical axis, G12 is a distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, and T6 is a thickness of the sixth lens on the optical axis.

18. The optical imaging lens according to claim 15 or 16, characterized in that, The optical imaging lens satisfies TL / (G45+T5+G56)≧5.600, where G45 is a distance from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis, and G56 is a distance from the image side surface of the fifth lens to the object side surface of the sixth lens on the optical axis.

19. The optical imaging lens according to claim 4, 5, 15 or 16, characterized in that, The optical imaging lens satisfies: T max / T max2 ≧1.

500.

20. The optical imaging lens according to claim 4, 5, 15 or 16, characterized in that, The optical imaging lens satisfies TTL / AAG≧4.900, where TTL is a distance from the object side surface of the first lens to an image plane of the optical imaging lens on the optical axis.

21. The optical imaging lens according to claim 1, 4, 5, 15 or 16, wherein, The optical imaging lens satisfies ALT / (G12+G45)≧4.200, where ALT is a sum of lens thicknesses of the first lens to the sixth lens on the optical axis, G12 is a distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, and G45 is a distance from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis.

22. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens comprises an object side surface facing the object side and passing imaging light and an image side surface facing the image side and passing imaging light, characterized in that: The first lens has negative refractive power. The second lens has positive refractive power. An on-axis region of the image side surface of the third lens is concave. The fifth lens has negative refractive power. An on-axis region of the object side surface of the sixth lens is concave and an on-axis region of the image side surface of the sixth lens is convex. The optical imaging lens has only the six lenses. The optical imaging lens further satisfies (T1+G12) / T6≦2.600, where T1 is a thickness of the first lens on the optical axis, G12 is a distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, and T6 is a thickness of the sixth lens on the optical axis. TTL is defined as a distance on the optical axis from an object side surface of the first lens to an image plane of the optical imaging lens, T5 is defined as a thickness on the optical axis of the fifth lens, G56 is defined as a distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens, T6 is defined as a thickness on the optical axis of the sixth lens, T1 is defined as a thickness on the optical axis of the first lens, ALT is defined as a sum of lens thicknesses on the optical axis from the first lens to the sixth lens, AAG is defined as a sum of five air gaps on the optical axis from the first lens to the sixth lens, and satisfy TTL / (T5+G56+T6)≧6.500 and ALT / AAG≧2.

700.

23. The optical imaging lens according to claim 22, characterized in that, The optical imaging lens further satisfies (T5+T6) / T1≦2.500, where T1 is a thickness on the optical axis of the first lens.

24. The optical imaging lens according to claim 1 or 22, characterized in that, The optical imaging lens further satisfies TTL / (G23+T3+G34)≧9.000, where G23 is a distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, T3 is a thickness on the optical axis of the third lens, and G34 is a distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens.

25. The optical imaging lens according to claim 15, 16 or 22, wherein, The optical imaging lens further satisfies (T1+G12+T2) / T3≧2.800, where T1 is a thickness on the optical axis of the first lens, G12 is a distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens, T2 is a thickness on the optical axis of the second lens, and T3 is a thickness on the optical axis of the third lens.

26. The optical imaging lens according to claim 1, 4, 5, 15, 16 or 22, wherein, The first lens to the sixth lens have a thickness on the optical axis, two of the first lens to the fourth lens have a thickness on the optical axis which is the thickest and the second thickest among the above six lenses, respectively.

Images