Optical imaging lens

Abstract

The invention provides an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side along an optical axis, each of the first lens to the eighth lens comprises an object side surface which faces the object side and allows the imaging light to pass through and an image side surface which faces the image side and allows the imaging light to pass through. An optical axis area of the object side surface of the first lens is a concave surface, the second lens has a negative refractive index, and an optical axis area of the object side surface of the third lens is a concave surface. An optical axis area of the image side surface of the fifth lens is a concave surface, and an optical axis area of the image side surface of the eighth lens is a convex surface.

Description

Technical Field

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

[0002] In recent years, optical imaging lenses have continuously evolved, with applications expanding beyond just video and video recording to include environmental monitoring, dashcam photography, virtual reality trackers, and facial recognition. Besides requiring lenses to be slim and compact, there's also a growing demand for ultra-wide-angle designs and higher image quality. Existing ultra-wide-angle lenses, due to their wider angle of light intake, require increased refractive index in some lenses, leading to an increase in the ratio of optical axis thickness to circumferential thickness. This increased ratio affects lens shaping and assembly yield. Therefore, designing an ultra-wide-angle optical imaging lens while maintaining system length, lens shaping, and assembly yield is a challenge. Furthermore, because a wide field of view lens can capture more light, the number of lens elements needs to be increased to eight to increase resolution, further complicating the design. Therefore, finding a solution that utilizes eight lenses within a limited system length while simultaneously increasing resolution and field of view is a critical challenge. Summary of the Invention

[0003] This invention provides an optical imaging lens that has a small size, a large field of view, and good imaging quality.

[0004] One embodiment of the present invention provides an optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along an optical axis from an object side to an image side. Each of the first to eighth 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. One optical axis region of the object-side surface of the first lens is concave. The second lens has a negative refractive index. One optical axis region of the object-side surface of the third lens is concave. One optical axis region of the image-side surface of the fifth lens is concave, and one optical axis region of the image-side surface of the eighth lens is convex. The optical imaging lens has only the above eight lenses, and the optical imaging lens satisfies: (ImgH+D41t52) / BFL≦3.600, where ImgH is the maximum image height of the optical imaging lens, D41t52 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging plane.

[0005] One embodiment of the present invention provides an optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along an optical axis from an object side to an image side. Each of the first to eighth 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. An optical axis region on the object-side surface of the first lens is concave, as are the optical axis regions on the image-side surfaces of the second, third, and fifth lenses. An optical axis region on the image-side surface of the fifth lens is concave, and an optical axis region on the image-side surface of the eighth lens is convex. The optical imaging lens has only the above eight lenses, and the optical imaging lens satisfies: (ImgH+D41t52) / BFL≦3.600, where ImgH is the maximum image height of the optical imaging lens, D41t52 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging plane.

[0006] One embodiment of the present invention provides an optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along an optical axis from an object side to an image side. Each of the first to eighth 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. An optical axis region on the object-side surface of the first lens is concave; a circumferential region on the image-side surface of the second lens is concave; an optical axis region on the object-side surface of the third lens is concave; an optical axis region on the image-side surface of the fifth lens is concave; and an optical axis region on the image-side surface of the eighth lens is convex. The optical imaging lens has only the above eight lenses, and the optical imaging lens satisfies: (ImgH+D41t52) / BFL≦3.600, where ImgH is the maximum image height of the optical imaging lens, D41t52 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging plane.

[0007] An embodiment of the present invention provides an optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along an optical axis from an object side to an image side. Each of the first to eighth 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. One optical axis region of the object-side surface of the third lens is concave, one optical axis region of the image-side surface of the fifth lens is concave, and one optical axis region of the image-side surface of the eighth lens is convex. The optical imaging lens has only these eight lenses, and the optical imaging lens satisfies: Fno*(ImgH+AAG) / EFL≦6.600, where Fno is the aperture value of the optical imaging lens, ImgH is the maximum image height of the optical imaging lens, AAG is the sum of the seven air gaps along the optical axis of the first to eighth lenses, and EFL is the effective focal length of the optical imaging lens.

[0008] Based on the above, the beneficial effects of the optical imaging lens of the embodiments of the present invention are as follows: by satisfying the above-mentioned concave and convex surface arrangement design of the lens, the refractive index condition, and the design that satisfies the above-mentioned conditional formula, the optical imaging lens can have a small size and at the same time have a large field of view and good imaging quality. Attached Figure Description

[0009] Figure 1 It is a schematic diagram illustrating the surface structure of a lens; Figure 2 It is a schematic diagram illustrating the concave and convex structure of a lens and the focal point of light rays; Figure 3 It is a schematic diagram illustrating the surface structure of a lens in Example 1; Figure 4 This is a schematic diagram illustrating the surface structure of a lens in Example 2; Figure 5 It is a schematic diagram illustrating the surface structure of a lens in Example 3; Figure 6 This is a schematic diagram of the optical imaging lens according to the first embodiment of the present invention; Figure 7 This is an aberration diagram of the first embodiment of the present invention; wherein, A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the meridional direction; and D is the distortion aberration. Figure 8 Detailed optical data of the optical imaging lens of the first embodiment of the present invention are shown; Figure 9 The aspherical parameters of the optical imaging lens according to the first embodiment of the present invention are shown; Figure 10 This is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention; Figure 11 This is an aberration diagram of the second embodiment of the present invention; wherein, A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the meridional direction; and D is the distortion aberration. Figure 12 Detailed optical data of the optical imaging lens of the second embodiment of the present invention are shown; Figure 13 The aspherical parameters of the optical imaging lens according to the second embodiment of the present invention are shown; Figure 14 This is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention; Figure 15 This is an aberration diagram of the third embodiment of the present invention; wherein, A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the meridional direction; and D is the distortion aberration. Figure 16 Detailed optical data of the optical imaging lens according to the third embodiment of the present invention are shown.

[0010] Figure 17 The aspherical parameters of the optical imaging lens according to the third embodiment of the present invention are shown; Figure 18 This is a schematic diagram of an optical imaging lens according to a fourth embodiment of the present invention; Figure 19 This is an aberration diagram of the fourth embodiment of the present invention; wherein, A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the meridional direction; and D is the distortion aberration. Figure 20 Detailed optical data of the optical imaging lens according to the fourth embodiment of the present invention are shown; Figure 21 The aspherical parameters of the optical imaging lens according to the fourth embodiment of the present invention are shown; Figure 22 This is a schematic diagram of an optical imaging lens according to the fifth embodiment of the present invention; Figure 23 This is an aberration diagram of the fifth embodiment of the present invention; wherein, A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the meridional direction; and D is the distortion aberration. Figure 24 Detailed optical data of the optical imaging lens according to the fifth embodiment of the present invention are shown; Figure 25 The aspherical parameters of the optical imaging lens according to the fifth embodiment of the present invention are shown; Figure 26 The values ​​of various important parameters of the optical imaging lens in the first to fifth embodiments of the present invention are as follows: Figure 27 The values ​​of various important parameters of the optical imaging lens in the first to fifth embodiments of the present invention are as follows: Figure 28 The numerical values ​​of the relationships of the optical imaging lenses of the first to fifth embodiments of the present invention are shown.

[0011] Icon labels: 0: Aperture; 1: First lens; 2: Second lens; 3: Third lens; 4: Fourth lens; 5: Fifth lens; 6: Sixth lens; 7: Seventh lens; 8: Eighth lens; 10: Optical imaging lens; 11, 21, 31, 41, 51, 61, 71, 81, 110, 410, 510, F1: Side view of the object; 12, 22, 32, 42, 52, 62, 72, 82, 120, 320, F2: Image from the side; 75: Adhesive layer; 99: Imaging surface; 100, 200, 300, 400, 500: Lens; 130: Assembly section; 113, 123, 213, 223, 313, 323, 413, 423, 513, 523, 613, 623, 713, 723, 813, 823, Z1: Optical axis region; 114, 124, 214, 224, 314, 324, 414, 424, 514, 524, 614, 624, 714, 724, 814, 824, Z2: Circular 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; F: Filter; I: Optical axis; Lm: Edge ray; Lc: Principal ray; M, R: Intersection point; OB: Optical boundary; TP1: First conversion point; TP2: Second switching point; Z3: Relay area. Detailed Implementation

[0012] 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.

[0013] 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 (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: the chief ray (Lc) and the marginal ray (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.

[0014] 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 1 As 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. In addition, the surface of lens 100 may have no transition points or at least one transition point. If a single lens surface has multiple transition points, these transition points are named sequentially from the first transition point in the radially outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (as shown in the example), and the third transition point TP2 (as shown in the example) are named sequentially from the first transition point in the radially outward direction. Figure 4 (as shown) and the Nth conversion point (farthest from optical axis I).

[0015] When the lens surface has at least one transition point, the region from the center point to the first transition point TP1 is defined as the optical axis region, which includes the center point. The region radially outward from the transition point farthest from optical axis I (the Nth transition point) to the optical boundary OB is defined as the circumferential region. In some embodiments, a relay region may be included between the optical axis region and the circumferential region; the number of relay regions depends on the number of transition points. When the lens surface has no transition points, 0% to 50% of the distance from optical axis I to the optical boundary OB of the lens surface is defined as the optical axis region, and 50% to 100% of the distance from optical axis I to the optical boundary OB of the lens surface is defined as the circumferential region.

[0016] 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.

[0017] 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.

[0018] 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 2 As 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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 its shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0023] 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 convex.

[0024] 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.

[0025] 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 region from 0% to 50% of the distance measured from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis region, and the region from 50% to 100% of the distance measured from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential region. 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.

[0026] Figure 6 This is a schematic diagram of the optical imaging lens according to the first embodiment of the present invention. Figure 7 This is a diagram showing the various aberrations of the optical imaging lens in the first embodiment. Please refer to it first. Figure 6The optical imaging lens 10 of the first embodiment of the present invention includes, in sequence along an optical axis I from the object side A1 to the image side A2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a filter F, wherein an aperture 0 may be disposed between the fourth lens 4 and the fifth lens 5. 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, seventh lens 7, eighth lens 8, and filter F, an image is formed on an image plane 99. The filter F is disposed between the image side 82 of the eighth lens 8 and the image plane 99. It should be noted that the object side A1 is the side facing the object to be photographed, while the image side A2 is the side facing the image plane 99. In one embodiment, the filter F may be an infrared cut filter, but the present invention is not limited thereto.

[0027] In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the filter F of the optical imaging lens 10 each have an object side facing the object side A1 and through which imaging light passes 11, 21, 31, 41, 51, 61, 71, 81, F1 and an image side facing the image side A2 and through which imaging light passes 12, 22, 32, 42, 52, 62, 72, 82, F2.

[0028] The first lens 1 has a negative refractive index. The first lens 1 can be made of plastic, but this invention is not limited thereto. The optical axis region 113 of the object-side surface 11 of the first lens 1 is concave, and its circumferential region 114 is convex. The optical axis region 123 of the image-side surface 12 of the first lens 1 is concave, and its circumferential region 124 is concave. In this embodiment, both the object-side surface 11 and the image-side surface 12 of the first lens 1 are aspherical surfaces, but this invention is not limited thereto.

[0029] The second lens 2 has a negative refractive index. The material of the second lens 2 can be plastic, but this invention is not limited thereto. The optical axis region 213 of the object-side surface 21 of the second lens 2 is convex, and its circumferential region 214 is concave. The optical axis region 223 of the image-side surface 22 of the second lens 2 is concave, and its circumferential region 224 is concave. In this embodiment, both the object-side surface 21 and the image-side surface 22 of the second lens 2 are aspherical, but this invention is not limited thereto.

[0030] The third lens 3 has a negative refractive index. The material of the third lens 3 can be plastic, but this invention is not limited thereto. The optical axis region 313 of the object-side surface 31 of the third lens 3 is concave, and its circumferential region 314 is also concave. The optical axis region 323 of the image-side surface 32 of the third lens 3 is convex, and its circumferential region 324 is also convex. In this embodiment, both the object-side surface 31 and the image-side surface 32 of the third lens 3 are aspherical, but this invention is not limited thereto.

[0031] The fourth lens 4 has a positive refractive index. The material of the fourth lens 4 can be plastic, but this invention is not limited thereto. The optical axis region 413 of the object-side surface 41 of the fourth lens 4 is concave, and its circumferential region 414 is also concave. The optical axis region 423 of the image-side surface 42 of the fourth lens 4 is convex, and its circumferential region 424 is also convex. In this embodiment, both the object-side surface 41 and the image-side surface 42 of the fourth lens 4 are aspherical, but this invention is not limited thereto.

[0032] The fifth lens 5 has a positive refractive index. The material of the fifth lens 5 can be plastic, but this invention is not limited thereto. The optical axis region 513 of the object-side surface 51 of the fifth lens 5 is convex, and its circumferential region 514 is also convex. The optical axis region 523 of the image-side surface 52 of the fifth lens 5 is concave, and its circumferential region 524 is also concave. In this embodiment, both the object-side surface 51 and the image-side surface 52 of the fifth lens 5 are aspherical, but this invention is not limited thereto.

[0033] The sixth lens 6 has a positive refractive index. The material of the sixth lens 6 can be plastic, but this invention is not limited thereto. The optical axis region 613 of the object-side surface 61 of the sixth lens 6 is convex, and its circumferential region 614 is also convex. The optical axis region 623 of the image-side surface 62 of the sixth lens 6 is convex, and its circumferential region 624 is also convex. In this embodiment, both the object-side surface 61 and the image-side surface 62 of the sixth lens 6 are aspherical, but this invention is not limited thereto.

[0034] The seventh lens 7 has a negative refractive index. The material of the seventh lens 7 can be plastic, but this invention is not limited thereto. The optical axis region 713 of the object-side surface 71 of the seventh lens 7 is concave, and its circumferential region 714 is also concave. The optical axis region 723 of the image-side surface 72 of the seventh lens 7 is convex, and its circumferential region 724 is concave. In this embodiment, both the object-side surface 71 and the image-side surface 72 of the seventh lens 7 are aspherical, but this invention is not limited thereto.

[0035] The eighth lens 8 has a positive refractive index. The material of the eighth lens 8 can be plastic, but this invention is not limited thereto. The optical axis region 813 of the object-side surface 81 of the eighth lens 8 is concave, and its circumferential region 814 is convex. The optical axis region 823 of the image-side surface 82 of the eighth lens 8 is convex, and its circumferential region 824 is convex. In this embodiment, both the object-side surface 81 and the image-side surface 82 of the eighth lens 8 are aspherical, but this invention is not limited thereto.

[0036] In this embodiment, the image-side surface 72 of the seventh lens 7 and the object-side surface 81 of the eighth lens 8 are bonded together with an adhesive layer 75. That is, the seventh lens 7, the adhesive layer 75 and the eighth lens 8 form a cemented lens group.

[0037] In this embodiment, the optical imaging lens 10 has only the above-mentioned eight lenses, namely the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8.

[0038] Other detailed optical data for the first embodiment are as follows: Figure 8 As shown, the effective focal length (EFL) of the optical imaging lens 10 in the first embodiment is 0.629 mm, the half field of view (HFOV) is 83.500 degrees, the aperture number (F-number, Fno) is 1.500, its system length (TTL) is 6.973 mm, and the maximum image height is 0.864 mm. The system length refers to the distance from the object side surface 11 of the first lens 1 to the imaging surface 99 on the optical axis I.

[0039] Furthermore, in this embodiment, the object-side surfaces 11, 21, 31, 41, 51, 61, 71, 81 and the image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7 and eighth lens 8, totaling sixteen surfaces, are aspherical. Among them, the object-side surfaces 11, 21, 31, 41, 51, 61, 71, 81 and the image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 are general even-order aspherical surfaces. These aspherical surfaces are defined according to the following formula: -----------(1) in: R: Radius of curvature of the lens surface near the optical axis I; Z: Depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis I and the tangent plane that is tangent to the vertex on the optical axis I of the aspherical surface). Y: The distance between a point on the aspherical curve and the optical axis I; K: Conic constant; a 2i : The second-order aspherical coefficient.

[0040] The aspherical coefficients of the object surface 11 of the first lens 1 to the image surface 82 of the eighth lens 8 in formula (1) are as follows: Figure 9 As shown. Among them, Figure 9 The field number 11 indicates that it is the aspheric coefficient of the object surface 11 of the first lens 1, and so on for the other fields. In this embodiment and the following embodiments, the second-order aspheric coefficient a2 is 0.

[0041] Furthermore, the important parameters of the optical imaging lens 10 in the first embodiment and their relationships are as follows: Figure 26 , Figure 27 and Figure 28 As shown.

[0042] in, T1 is the thickness of the first lens 1 on the optical axis I; T2 is the thickness of the second lens 2 on the optical axis I; T3 is the thickness of the third lens 3 on the optical axis I; T4 is the thickness of the fourth lens 4 on the 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; T7 is the thickness of the seventh lens 7 on optical axis I; T8 is the thickness of the eighth lens 8 on optical axis I; TF is the thickness of filter F along optical axis I; G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I; G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I; G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I; G45 is the air gap between the fourth lens 4 and the fifth lens 5 on the optical axis I; G56 is the air gap between the fifth lens 5 and the sixth lens 6 on the optical axis I; G67 is the air gap between the sixth lens 6 and the seventh lens 7 on the optical axis I; G78 is the air gap between the seventh lens 7 and the eighth lens 8 on the optical axis I; G8F is the air gap between the eighth lens 8 and the filter F on the optical axis I; GFP is the air gap between filter F and imaging surface 99 on optical axis I; AAG is the sum of the seven air gaps on the optical axis I from the first lens 1 to the eighth lens 8, namely the sum of G12, G23, G34, G45, G56, G67 and G78; ALT is the sum of the thicknesses of the eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, namely the sum of T1, T2, T3, T4, T5, T6, T7 and T8; TL is the distance on the optical axis I from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8. TTL is the distance on the optical axis I from the object surface 11 to the imaging surface 99 of the first lens 1. BFL is the distance on optical axis I from the image side surface 82 of the eighth lens 8 to the imaging surface 99, which is the sum of G8F, TF and GFP; D41t52 is the distance on the optical axis I from the object side 41 of the fourth lens 4 to the image side 52 of the fifth lens 5, which is the sum of T4, G45 and T5. D61t82 is the distance on the optical axis I from the object side 61 of the sixth lens 6 to the image side 82 of the eighth lens 8, which is the sum of T6, G67, T7, G78 and T8. D51t62 is the distance on the optical axis I from the object side 51 of the fifth lens 5 to the image side 62 of the sixth lens 6, which is the sum of T5, G56 and T6. D21t32 is the distance on the optical axis I from the object side 21 of the second lens 2 to the image side 32 of the third lens 3, that is, the sum of T2, G23 and T3; D71t81 is the distance on the optical axis I from the object side surface 71 of the seventh lens 7 to the object side surface 81 of the eighth lens 8, which is the sum of T7 and G78. D72t82 is the distance on optical axis I from the image-side surface 72 of the seventh lens 7 to the image-side surface 82 of the eighth lens 8, which is the sum of G78 and T8. D11t21 is the distance on the optical axis I from the object side surface 11 of the first lens 1 to the object side surface 21 of the second lens 2, which is the sum of T1 and G12. D32t51 is the distance on the optical axis I from the image side 32 of the third lens 3 to the object side 51 of the fifth lens 5, which is the sum of G34, T4 and G45. D11t32 is the distance on the optical axis I from the object side 11 of the first lens 1 to the image side 32 of the third lens 3, that is, the sum of T1, G12, T2, G23 and T3; D22t41 is the distance on the optical axis I from the image side 22 of the second lens 2 to the object side 41 of the fourth lens 4, which is the sum of G23, T3 and G34. D52t71 is the distance on the optical axis I from the image side surface 52 of the fifth lens 5 to the object side surface 71 of the seventh lens 7, which is the sum of G56, T6 and G67. Tmax is the maximum value of the thickness of the eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, namely the maximum value among T1, T2, T3, T4, T5, T6, T7 and T8; Tavg is the average thickness of the eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, namely the average thicknesses of T1, T2, T3, T4, T5, T6, T7 and T8. EFL is the effective focal length of the optical imaging lens 10; HFOV is half the field of view of the optical imaging lens 10; ImgH is the maximum image height of the optical imaging lens 10; Fno is the aperture value of the optical imaging lens 10; Furthermore, redefine: f1 is the focal length of the first lens 1; f2 is the focal length of the second lens 2; f3 is the focal length of the third lens 3; f4 is the focal length of the fourth lens 4; f5 is the focal length of the fifth lens 5; f6 is the focal length of the sixth lens 6; f7 is the focal length of the seventh lens 7; f8 is the focal length of the eighth lens 8; n1 is the nd refractive index of the first lens 1; n2 is the nd refractive index of the second lens 2; n3 is the nd refractive index of the third lens 3; n4 is the nd refractive index of the fourth lens 4; n5 is the nd refractive index of the fifth lens 5; n6 is the nd refractive index of the sixth lens 6; n7 is the nd refractive index of the seventh lens 7; n8 is the nd refractive index of the eighth lens 8; V1 is the Abbe number of the first lens 1, Vd; V2 is the Abbe number of the second lens 2, Vd; V3 is the Abbe number of the third lens 3; V4 is the Abbe number of the fourth lens 4; V5 is the Abbe number of the fifth lens 5; V6 is the Abbe number of the sixth lens 6; V7 is the Abbe number of the seventh lens 7; V8 is the Abbe number of the eighth lens 8.

[0043] The material parameters of the lens disclosed in the optical datasheet of the embodiments are in the international glass code format of nd refractive index and Vd Abbe number, so that those skilled in the art can know the specific material implementation. Here, nd is the refractive index of the material at the d-helium yellow line of 587.56 nm, and Vd is calculated using the refractive index of the material at the d, F, and C wavelengths of the Fraunhofer spectrum. The focal length values ​​disclosed in the optical datasheet of the embodiments are calculated based on the refractive index of the optical system implemented at that wavelength. Since the primary wavelength of the embodiments of the present invention is 555 nm, the focal length values ​​of the embodiments of the present invention are calculated based on the refractive index of the material at 555 nm.

[0044] See also Figure 7 , Figure 7 The diagram in Part A illustrates the Longitudinal Spherical Aberration of the first embodiment. Figure 7 Part B and Figure 7 The diagrams in section C illustrate the field curvature aberrations in the sagittal and tangential directions on the imaging plane 99 of the first embodiment when the wavelengths are 470 nm, 555 nm, and 650 nm. Figure 7 The diagram in section D illustrates the distortion aberration on the imaging plane 99 of the first embodiment when the wavelengths are 470 nm, 555 nm, and 650 nm. The longitudinal spherical aberration of this first embodiment is shown below. Figure 7 As shown in Part A, the curves for each wavelength are very close and move towards the center, indicating that off-axis rays at different heights for each wavelength are concentrated near the imaging point. The skewing of the curves for each wavelength shows that the imaging point deviation of off-axis rays at different heights is controlled within ±45 micrometers (μm). Therefore, this first 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 rays representing different wavelengths are quite concentrated, thus significantly improving chromatic aberration.

[0045] exist Figure 7 Part B and Figure 7In the two field curvature aberration diagrams in section C, the field curvature aberrations of the three representative wavelengths fall within ±50 micrometers across the entire field of view, demonstrating that the optical system of this first embodiment can effectively eliminate aberrations. Figure 7 The distortion aberration diagram in part D shows that the distortion aberration of this first embodiment is maintained within ±90%, indicating that the distortion aberration of this first embodiment meets the imaging quality requirements of the optical system. Therefore, this first embodiment, compared to existing optical imaging lenses, still provides good imaging quality even with a system length shortened to 6.973 mm. Thus, this first embodiment can have a smaller size within the limits of manufacturing tolerances. The first embodiment also improves manufacturing yield, has good imaging quality, and a large field of view.

[0046] Figure 10 This is a schematic diagram of the optical imaging lens according to the second embodiment of the present invention. Figure 11 This is a diagram showing the various aberrations of the optical imaging lens in the second embodiment. Please refer to it first. Figure 10 A second embodiment of the optical imaging lens 10 of the present invention is generally similar to the first embodiment, but the differences are as follows: the optical data, aspherical coefficients, and parameters between these lenses 1, 2, 3, 4, 5, 6, 7, and 8 are more or less different. Furthermore, in this embodiment, the third lens 3 has a positive refractive index, the fourth lens 4 has a negative refractive index, the optical axis region 723 of the image-side surface 72 of the seventh lens 7 is concave, and the optical axis region 813 of the object-side surface 81 of the eighth lens 8 is convex. It should be noted that, for clearer illustration, Figure 10 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0047] Detailed optical data of the optical imaging lens 10 in the second embodiment are as follows: Figure 12 As shown, the optical imaging lens 10 of the second embodiment has an effective focal length of 0.709 mm, a half field of view (HFOV) of 83.500 degrees, an aperture value (Fno) of 1.500, a system length (TTL) of 6.754 mm, and a maximum image height (ImgH) of 0.863 mm.

[0048] In the second embodiment, the object-side surfaces 11, 21, 31, 41, 51, 61, 71, 81 and the image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7 and eighth lens 8, totaling sixteen surfaces, are aspherical, and their aspherical coefficients in formula (1) are as follows: Figure 13 As shown.

[0049] Furthermore, the important parameters of the optical imaging lens 10 in the second embodiment and their relationships are as follows: Figure 26 , Figure 27 and Figure 28 As shown.

[0050] The longitudinal spherical aberration of this second embodiment is as follows: Figure 11 As shown in Part A, the imaging point deviation of off-axis rays at different heights is controlled within ±10 micrometers. Figure 11 Part B and Figure 11 In the two field curvature aberration diagrams in section C, the field curvature aberrations of the three representative wavelengths fall within ±18 micrometers across the entire field of view. Figure 11 The distortion aberration diagram of part D shows that the distortion aberration of this second embodiment is maintained within the range of ±90%.

[0051] As can be seen from the above description, the system length (TTL) of the second embodiment is shorter than that of the first embodiment, the longitudinal spherical aberration of the second embodiment is smaller than that of the first embodiment, and the field curvature aberration of the second embodiment is smaller than that of the first embodiment. Furthermore, compared to the first embodiment, the thickness difference between the optical axis region and the circumferential region of the lens in the second embodiment is smaller, making it easier to manufacture and resulting in a higher yield.

[0052] Figure 14 This is a schematic diagram of the optical imaging lens according to the third embodiment of the present invention. Figure 15 This is a diagram showing the various aberrations of the optical imaging lens in the third embodiment. Please refer to it first. Figure 14 This invention provides a third embodiment of the optical imaging lens 10, which is generally similar to the first embodiment, but differs as follows: the optical data, aspherical coefficients, and parameters among lenses 1, 2, 3, 4, 5, 6, 7, and 8 are somewhat different. Furthermore, in this embodiment, the circumferential region 214 of the object-side surface 21 of the second lens 2 is convex, the third lens 3 has a positive refractive index, the fifth lens 5 has a negative refractive index, the optical axis region 513 of the object-side surface 51 of the fifth lens 5 is concave, the circumferential region 514 of the object-side surface 51 of the fifth lens 5 is concave, the circumferential region 524 of the image-side surface 52 of the fifth lens 5 is convex, the circumferential region 724 of the image-side surface 72 of the seventh lens 7 is convex, and the circumferential region 814 of the object-side surface 81 of the eighth lens 8 is concave. It should be noted that, for clearer illustration, [further details are needed]. Figure 14 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0053] Detailed optical data of the optical imaging lens 10 in the third embodiment are as follows: Figure 16As shown, the effective focal length of the optical imaging lens 10 in the third embodiment is 0.662 mm, the half field of view (HFOV) is 83.500 degrees, the aperture value (Fno) is 1.600, the system length is 7.436 mm, and the maximum image height is 0.636 mm.

[0054] In the third embodiment, the object-side surfaces 11, 21, 31, 41, 51, 61, 71, 81 and the image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7 and eighth lens 8, totaling sixteen surfaces, are aspherical. Their aspherical coefficients in formula (1) are as follows: Figure 17 As shown.

[0055] Furthermore, the important parameters of the optical imaging lens 10 in the third embodiment and their relationships are as follows: Figure 26 , Figure 27 and Figure 28 As shown.

[0056] The longitudinal spherical aberration of this third embodiment is as follows: Figure 15 As shown in Part A, the imaging point deviation of off-axis rays at different heights is controlled within ±6 micrometers. Figure 15 Part B and Figure 15 In the two field curvature aberration diagrams in section C, the field curvature aberrations of the three representative wavelengths fall within ±10 micrometers across the entire field of view. Figure 15 The distortion aberration diagram of part D shows that the distortion aberration of this third embodiment is maintained within the range of ±90%.

[0057] As can be seen from the above description, the longitudinal spherical aberration of the third embodiment is smaller than that of the first embodiment, and the field curvature aberration of the third embodiment is smaller than that of the first embodiment.

[0058] Figure 18 This is a schematic diagram of the optical imaging lens according to the fourth embodiment of the present invention. Figure 19 This is a diagram showing the various aberrations of the optical imaging lens in the fourth embodiment. Please refer to [the diagram]. Figure 18This invention provides a fourth embodiment of the optical imaging lens 10, which is generally similar to the first embodiment, but differs from the first embodiment in the following ways: the optical data, aspherical coefficients, and parameters of lenses 1, 2, 3, 4, 5, 6, 7, and 8 are slightly different. Furthermore, in this embodiment, the third lens 3 has a positive refractive index, the optical axis region 413 of the object-side surface 41 of the fourth lens 4 is convex, the fifth lens 5 has a negative refractive index, the optical axis region 613 of the object-side surface 61 of the sixth lens 6 is concave, the circumferential region 614 of the object-side surface 61 of the sixth lens 6 is concave, the seventh lens 7 has a positive refractive index, the optical axis region 713 of the object-side surface 71 of the seventh lens 7 is convex, the circumferential region 714 of the object-side surface 71 of the seventh lens 7 is convex, the optical axis region 723 of the image-side surface 72 of the seventh lens 7 is concave, and the optical axis region 813 of the object-side surface 81 of the eighth lens 8 is convex. It should be noted that, for clear visualization of the figures, Figure 18 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0059] Detailed optical data of the optical imaging lens 10 in the fourth embodiment are as follows: Figure 20 As shown, the optical imaging lens 10 of the fourth embodiment has an effective focal length of 0.600 mm, a half field of view (HFOV) of 83.500 degrees, an aperture value (Fno) of 1.800, a system length of 7.495 mm, and a maximum image height of 0.470 mm.

[0060] In the fourth embodiment, the object-side surfaces 11, 21, 31, 41, 51, 61, 71, 81 and the image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7 and eighth lens 8, totaling sixteen surfaces, are aspherical. Their aspherical coefficients in formula (1) are as follows: Figure 21 As shown.

[0061] Furthermore, the important parameters of the optical imaging lens 10 in the fourth embodiment and their relationships are as follows: Figure 26 , Figure 27 and Figure 28 As shown.

[0062] The longitudinal spherical aberration of this fourth embodiment is as follows: Figure 19 As shown in Part A, the imaging point deviation of off-axis rays at different heights is controlled within ±4.5 micrometers. Figure 19 Part B and Figure 19 In the two field curvature aberration diagrams in section C, the field curvature aberrations of the three representative wavelengths fall within ±6 micrometers across the entire field of view. Figure 19 The distortion aberration diagram of part D shows that the distortion aberration of this fourth embodiment is maintained within the range of ±100%.

[0063] As can be seen from the above description, the longitudinal spherical aberration of the fourth embodiment is smaller than that of the first embodiment, and the field curvature aberration of the fourth embodiment is smaller than that of the first embodiment.

[0064] Figure 22 This is a schematic diagram of the optical imaging lens according to the fifth embodiment of the present invention. Figure 23 This is a diagram showing the various aberrations of the optical imaging lens in the fifth embodiment. Please refer to [the diagram first]. Figure 22 This invention provides a fifth embodiment of the optical imaging lens 10, which is generally similar to the first embodiment, but differs from the first embodiment in the following ways: the optical data, aspherical coefficients, and parameters among lenses 1, 2, 3, 4, 5, 6, 7, and 8 are somewhat different. Furthermore, in this embodiment, the third lens 3 has a positive refractive index, the fifth lens 5 has a negative refractive index, the optical axis region 723 of the image-side surface 72 of the seventh lens 7 is concave, and the optical axis region 813 of the object-side surface 81 of the eighth lens 8 is convex. It should be noted that, for clear visualization of the figures, Figure 22 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0065] Detailed optical data of the optical imaging lens 10 in the fifth embodiment are as follows: Figure 24 As shown, the optical imaging lens 10 of the fifth embodiment has an effective focal length of 0.802 mm, a half field of view (HFOV) of 83.500 degrees, an aperture value (Fno) of 1.500, a system length of 5.409 mm, and a maximum image height of 0.849 mm.

[0066] In the fifth embodiment, the object-side surfaces 11, 21, 31, 41, 51, 61, 71, 81 and the image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7 and eighth lens 8, totaling sixteen surfaces, are aspherical. Their aspherical coefficients in formula (1) are as follows: Figure 25 As shown.

[0067] Furthermore, the important parameters of the optical imaging lens 10 in the fifth embodiment and their relationships are as follows: Figure 26 , Figure 27 and Figure 28 As shown.

[0068] The longitudinal spherical aberration of this fifth embodiment is as follows: Figure 23 As shown in Part A, the imaging point deviation of off-axis rays at different heights is controlled within ±8 micrometers. Figure 23 Part B and Figure 23In the two field curvature aberration diagrams in section C, the field curvature aberrations of the three representative wavelengths fall within ±16 micrometers across the entire field of view. Figure 23 The distortion aberration diagram of part D shows that the distortion aberration of this fifth embodiment is maintained within the range of ±90%.

[0069] As can be seen from the above description, the system length of the fifth embodiment is less than that of the first embodiment, the longitudinal spherical aberration of the fifth embodiment is less than that of the first embodiment, and the field curvature aberration of the fifth embodiment is less than that of the first embodiment.

[0070] See also Figures 26 to 28 , Figures 26 to 28 This is a tabular diagram showing the optical parameters and their conditional expressions for the first to fifth embodiments described above. Figure 26 and Figure 27 In the table, the values ​​in the HFOV column are in degrees, the values ​​in columns V1 to Fno have no units, and the values ​​in the other columns are in millimeters (mm). Figure 28 In the table, the values ​​in columns HFOV*ALT / (EFL+AAG), HFOV*D32t51 / ALT, and HFOV*(TL+ImgH) / ALT are in degrees, while the values ​​in other columns are unitless.

[0071] The optical imaging lens 10 of the embodiments of the present invention is mainly used for capturing images and videos, and is applied to portable electronic products, such as mobile phones, cameras, tablet computers, personal digital assistants (PDAs) or head-mounted displays (such as augmented reality displays, virtual reality displays or mixed reality displays).

[0072] In summary, when the optical imaging lens 10 of the embodiment of the present invention has a concave optical axis region 313 on the object side 31 of the third lens 3, a concave optical axis region 523 on the image side 52 of the fifth lens 5, and a convex optical axis region 823 on the image side 82 of the eighth lens 8, and when the optical axis region 113 on the object side 11 of the first lens 1 is concave and the second lens 2 has a negative refractive index, it can converge and focus light rays at different angles, correct the aberration of the central field of view of the imaging plane 99, and when combined with (ImgH+D41t52) / BFL≦3.600, it can shorten the lens length and maintain the imaging quality and assembly yield while having a large half of the viewing angle. The preferred range of (ImgH+D41t52) / BFL≦3.600 is 1.250≦(ImgH+D41t52) / BFL≦3.600.

[0073] When the optical imaging lens 10 of the embodiment of the present invention has a concave optical axis region 313 of the object side 31 of the third lens 3, a concave optical axis region 523 of the image side 52 of the fifth lens 5, and a convex optical axis region 823 of the image side 82 of the eighth lens 8, and the optical axis region 113 of the object side 11 of the first lens 1 is concave and the optical axis region 223 of the image side 22 of the second lens 2 is concave, it can converge and gather light rays at different angles, correct the aberration of the central field of view of the imaging surface 99, and when it is combined with (ImgH+D41t52) / BFL≦3.600, it can shorten the lens length and maintain the imaging quality and assembly yield while having a large half of the viewing angle. The preferred range of (ImgH+D41t52) / BFL≦3.600 is 1.250≦(ImgH+D41t52) / BFL≦3.600.

[0074] When the optical imaging lens 10 of the embodiment of the present invention has a concave optical axis region 313 of the object side 31 of the third lens 3, a concave optical axis region 523 of the image side 52 of the fifth lens 5, and a convex optical axis region 823 of the image side 82 of the eighth lens 8, and the object side 11 of the first lens 1 has a concave optical axis region 113, and the circumferential region 224 of the image side 22 of the second lens 2, it can converge and gather light rays from different angles, correct the aberration of the central field of view of the imaging surface 99, and when it is combined with (ImgH+D41t52) / BFL≦3.600, it can shorten the lens length and maintain the imaging quality and assembly yield while having a large half of the viewing angle. The preferred range of (ImgH+D41t52) / BFL≦3.600 is 1.250≦(ImgH+D41t52) / BFL≦3.600.

[0075] When the optical imaging lens 10 of the embodiment of the present invention has a concave optical axis region 313 on the object side 31 of the third lens 3, a concave optical axis region 523 on the image side 52 of the fifth lens 5, and a convex optical axis region 823 on the image side 82 of the eighth lens 8, it can converge and gather light rays at different angles, correct the aberration of the central field of view of the imaging surface 99, and through the combination of air gap and focal length, when Fno*(ImgH+AAG) / EFL≦6.600, it can reduce the aperture value and increase the aperture, while maintaining image quality and assembly yield. The preferred range of Fno*(ImgH+AAG) / EFL≦6.600 is 3.700≦Fno*(ImgH+AAG) / EFL≦6.600.

[0076] Furthermore, in order to shorten the length of the lens system while increasing the half-angle of view, the air gap between the lenses is reduced or the lens thickness is appropriately shortened. If at least one of the following conditions is met, the optical imaging lens 10 of the embodiment of the present invention can have better configuration and optical quality: HFOV*ALT / (EFL+AAG)≧120.000 degrees, preferably 206.000 degrees≧HFOV*ALT / (EFL+AAG)≧120.000 degrees; HFOV*D32t51 / ALT ≥ 10.000 degrees, preferably 44.000 degrees ≥ HFOV*D32t51 / ALT ≥ 10.000 degrees; and HFOV*(TL+ImgH) / ALT≧120.000 degrees, preferably 152.600 degrees≧HFOV*(TL+ImgH) / ALT≧120.000 degrees.

[0077] Furthermore, in order to shorten the length of the lens system and ensure image quality, while also considering the ease of manufacturing, the air gap between the lenses is reduced or the lens thickness is appropriately shortened. If at least one of the following conditions is met, the optical imaging lens 10 of the embodiment of the present invention can have a better configuration: Fno*AAG / BFL≦3.200, preferably 1.360≦Fno*AAG / BFL≦3.200; (D61t82+BFL) / EFL≧3.500, preferably 5.000≧(D61t82+BFL) / EFL≧3.500; (EFL+D51t62) / D21t32≦2.100, preferably 0.800≦(EFL+D51t62) / D21t32≦2.100; (TL+EFL) / BFL≦9.500, preferably 3.900≦(TL+EFL) / BFL≦9.500; (BFL+T4+T5+T6) / (T1+T2+T3)≧2.100, preferably 3.400 degrees≧(BFL+T4+T5+T6) / (T1+T2+T3)≧2.000; Fno*ALT / D71t81≧17.500, preferably 35.000≧Fno*ALT / D71t81≧17.500; (AAG+D72t82) / D21t32≦1.800, preferably 1.300≦(AAG+D72t82) / D21t32≦1.800; Fno*TL / D11t21≦14.000, preferably 6.200≦Fno*TL / D11t21≦14.000; (ALT+BFL) / AAG≧2.500, preferably 4.400≧(ALT+BFL) / AAG≧2.500; TTL / D11t32≦3.200, preferably 2.150≦TTL / D11t32≦3.200; (T4+T5+T6) / D22t41≧1.150 degrees, preferably 2.600≧(T4+T5+T6) / D22t41≧1.150; (TL+T2+T3) / D52t71≦7.700, preferably 5.500≦(TL+T2+T3) / D52t71≦7.700; TTL / ImgH ≥ 6.000, preferably 17.500 ≥ TTL / ImgH ≥ 6.000; TL / Tavg ≤ 12.300, preferably 9.300 ≤ TL / Tavg ≤ 12.300; and (EFL+AAG) / Tmax≦3.400, preferably 1.570≦(EFL+AAG) / Tmax≦3.400.

[0078] In addition, any combination of parameters in the embodiments can be selected to increase lens constraints, thereby facilitating lens design with the same architecture as the present invention.

[0079] 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, improve the field of view, enhance the imaging 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.

[0080] The embodiments of this invention disclose optical parameters including, but not limited to, focal length, lens thickness, and Abbe number (Vd). For example, the present invention discloses an optical parameter A and an optical parameter B in various embodiments. The specific explanations of the ranges covered by these optical parameters, the comparative relationships between the optical parameters, and the conditional ranges covered by the multiple embodiments are as follows: (1) The range covered by the optical parameters, for example: α2≦A≦α1 or β2≦B≦β1, where α1 is the maximum value of optical parameter A in multiple embodiments, α2 is the minimum value of optical parameter A in multiple embodiments, β1 is the maximum value of optical parameter B in multiple embodiments, and β2 is the minimum value of optical parameter B in multiple embodiments.

[0081] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0082] (3) The conditional range covered by multiple embodiments, specifically, the combination or proportional relationships obtained by possible calculations of a plurality of optical parameters of the same embodiment, defined as E. E may be, for example: A+B or AB or A / B or A*B or (A*B). 1 / 2 E satisfies the condition E≦γ1 or E≧γ2 or γ2≦E≦γ1, where γ1 and γ2 are the values ​​obtained by calculation of optical parameter A and optical parameter B in the same embodiment, and γ1 is the maximum value in multiple embodiments of the present invention, and γ2 is the minimum value in multiple embodiments of the present invention.

[0083] The range covered by the aforementioned optical parameters, the comparative relationships between the optical parameters, and the maximum, minimum, and numerical ranges within these conditions are all features upon which the present invention can be implemented, and all fall within the scope disclosed in the present invention. The above are merely illustrative examples and should not be construed as limiting.

[0084] All embodiments of the present invention are feasible, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, these feature combinations can achieve unexpected effects. These feature combinations include, but are not limited to, combinations of features such as surface shape, refractive index, and conditional features. The disclosure of the embodiments of the present invention is a specific example to illustrate the principles of the present invention and should not be limited to the disclosed embodiments. Furthermore, the embodiments and their accompanying drawings are only for illustrative purposes and are not limited thereto.

[0085] 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 sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein each of the first to eighth 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 the imaging light passes; characterized in that: The optical axis region on the side of the first lens is concave; The second lens has a negative refractive index; The optical axis region on the side of the third lens is concave. The optical axis region on the image side of the fifth lens is concave; The optical axis region of the image side of the eighth lens is convex. The optical imaging lens has only the eight lenses mentioned above, and the optical imaging lens satisfies the following: (ImgH+D41t52) / BFL≦3.600, Where ImgH is the maximum image height of the optical imaging lens, D41t52 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface.

2. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein each of the first lens to the eighth lens 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 the imaging light passes; characterized in that: The optical axis region on the side of the first lens is concave; The optical axis region on the image side of the second lens is concave; The optical axis region on the side of the third lens is concave. The optical axis region on the image side of the fifth lens is concave; The optical axis region of the image side of the eighth lens is convex. The optical imaging lens has only the eight lenses mentioned above, and the optical imaging lens satisfies the following: (ImgH+D41t52) / BFL≦3.600, Where ImgH is the maximum image height of the optical imaging lens, D41t52 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface.

3. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein each of the first lens to the eighth lens 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 the imaging light passes; characterized in that: The optical axis region on the side of the first lens is concave; A circumferential region on the image side of the second lens is concave. The optical axis region on the side of the third lens is concave. The optical axis region on the image side of the fifth lens is concave; The optical axis region of the image side of the eighth lens is convex. The optical imaging lens has only the eight lenses mentioned above, and the optical imaging lens satisfies the following: (ImgH+D41t52) / BFL≦3.600, Where ImgH is the maximum image height of the optical imaging lens, D41t52 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface.

4. The optical imaging lens as described in claim 1, 2, or 3, characterized in that: The optical imaging lens further satisfies: Fno*AAG / BFL≦3.200, where Fno is the aperture value of the optical imaging lens, and AAG is the sum of the seven air gaps on the optical axis from the first lens to the eighth lens.

5. The optical imaging lens as described in claim 1, 2, or 3, characterized in that: The optical imaging lens further satisfies the following condition: (D61t82+BFL) / EFL≧3.500, where D61t82 is the distance on the optical axis from the object side of the sixth lens to the image side of the eighth lens, and EFL is the effective focal length of the optical imaging lens.

6. The optical imaging lens as described in claim 1, 2, or 3, characterized in that: The optical imaging lens further satisfies: (EFL+D51t62) / D21t32≦2.100, where EFL is the effective focal length of the optical imaging lens, D51t62 is the distance on the optical axis from the object side of the fifth lens to the image side of the sixth lens, and D21t32 is the distance on the optical axis from the object side of the second lens to the image side of the third lens.

7. The optical imaging lens as described in claim 1, 2, or 3, characterized in that: The optical imaging lens further satisfies the following condition: (TL+EFL) / BFL≦9.500, where TL is the distance on the optical axis from the object side of the first lens to the image side of the eighth lens, and EFL is the effective focal length of the optical imaging lens.

8. The optical imaging lens as described in claim 1, 2, or 3, characterized in that: The optical imaging lens further satisfies: (BFL+T4+T5+T6) / (T1+T2+T3)≧2.100, where T4 is the thickness of the fourth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, and T3 is the thickness of the third lens on the optical axis.

9. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein each of the first lens to the eighth lens 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 the imaging light passes; characterized in that: The optical axis region on the side of the third lens is concave. The optical axis region on the image side of the fifth lens is concave; The optical axis region of the image side of the eighth lens is convex. The optical imaging lens has only the eight lenses mentioned above, and the optical imaging lens satisfies the following: Fno*(ImgH+AAG) / EFL≦6.600, Where Fno is the aperture value of the optical imaging lens, ImgH is the maximum image height of the optical imaging lens, AAG is the sum of the seven air gaps of the first lens to the eighth lens on the optical axis, and EFL is the effective focal length of the optical imaging lens.

10. The optical imaging lens as described in claim 9, characterized in that: The optical imaging lens further satisfies: HFOV*ALT / (EFL+AAG)≧120.000 degrees, where HFOV is the half angle of view of the optical imaging lens, and ALT is the sum of the thicknesses of the eight lenses from the first lens to the eighth lens on the optical axis.

11. The optical imaging lens as described in claim 9, characterized in that: The optical imaging lens further satisfies: Fno*ALT / D71t81≧17.500, where ALT is the sum of the thicknesses of the eight lenses from the first lens to the eighth lens on the optical axis, and D71t81 is the distance on the optical axis from the object side of the seventh lens to the object side of the eighth lens.

12. The optical imaging lens as described in claim 9, characterized in that: The optical imaging lens further satisfies: (AAG+D72t82) / D21t32≦1.800, where D72t82 is the distance on the optical axis from the image side of the seventh lens to the image side of the eighth lens, and D21t32 is the distance on the optical axis from the object side of the second lens to the image side of the third lens.

13. The optical imaging lens as described in claim 9, characterized in that: The optical imaging lens further satisfies: Fno*TL / D11t21≦14.000, where TL is the distance on the optical axis from the object side of the first lens to the image side of the eighth lens, and D11t21 is the distance on the optical axis from the object side of the first lens to the object side of the second lens.

14. The optical imaging lens as described in claim 9, characterized in that: The optical imaging lens further satisfies: (ALT+BFL) / AAG≧2.500, where ALT is the sum of the thicknesses of the eight lenses from the first lens to the eighth lens on the optical axis, and BFL is the distance from the image side of the eighth lens to the imaging surface on the optical axis.

15. The optical imaging lens as described in claim 1, 2, 3, or 9, characterized in that: The optical imaging lens further satisfies the following: HFOV*D32t51 / ALT≧10.000 degrees, where HFOV is the half angle of view of the optical imaging lens, D32t51 is the distance on the optical axis from the image side of the third lens to the object side of the fifth lens, and ALT is the sum of the thicknesses of the eight lenses from the first lens to the eighth lens on the optical axis.

16. The optical imaging lens as described in claim 1, 2, 3, or 9, characterized in that: The optical imaging lens further satisfies: TTL / D11t32≦3.200, where TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, and D11t32 is the distance from the object side of the first lens to the image side of the third lens on the optical axis.

17. The optical imaging lens as described in claim 1, 2, 3, or 9, characterized in that: The optical imaging lens further satisfies: (T4+T5+T6) / D22t41≧1.150, where T4 is the thickness of the fourth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, and D22t41 is the distance on the optical axis from the image side of the second lens to the object side of the fourth lens.

18. The optical imaging lens as described in claim 1, 2, 3, or 9, characterized in that: The optical imaging lens further satisfies: (TL+T2+T3) / D52t71≦7.700, where TL is the distance on the optical axis from the object side of the first lens to the image side of the eighth lens, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and D52t71 is the distance on the optical axis from the image side of the fifth lens to the object side of the seventh lens.

19. The optical imaging lens as described in claim 1, 2, 3, or 9, characterized in that: The optical imaging lens further satisfies the following condition: TTL / ImgH≧6.000, where TTL is the distance from the object side of the first lens to the imaging surface on the optical axis.

20. The optical imaging lens as described in claim 1, 2, 3, or 9, characterized in that: The optical imaging lens further satisfies: HFOV*(TL+ImgH) / ALT≧120.000 degrees, where HFOV is the half angle of view of the optical imaging lens, TL is the distance on the optical axis from the object side of the first lens to the image side of the eighth lens, and ALT is the sum of the thicknesses of the eight lenses from the first lens to the eighth lens on the optical axis.

Images