Optical imaging lens

Abstract

The invention provides an optical imaging lens. The lens only comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side. According to the optical imaging lens, the detail features of the lenses are designed, the specific range of parameter combination is met, the optical imaging lens has good imaging quality, the appearance is light, thin, short and small, and excellent imaging quality can be provided in a low-brightness environment.

Description

Technical Field

[0001] This invention relates to an optical imaging lens, and more particularly to a three-element optical imaging lens employing three lenses. Background Technology

[0002] Portable electronic products, such as mobile phones, cameras, tablets, personal digital assistants (PDAs), and head-mounted displays, are constantly evolving in specifications, leading to a greater diversification of their key components—optical imaging lenses. In recent years, optical imaging lenses have continued to evolve, with applications expanding to include augmented reality (AR), virtual reality (VR), and mixed reality (MR) head-mounted displays. These lenses not only need to be lightweight to reduce the burden of wearing them, but some, due to their internal placement, also have difficulty receiving external light sources, necessitating increased light intake to improve image quality. Therefore, designing optical imaging lenses that are lightweight, compact, have high light intake, and offer excellent image quality has become a challenging problem that needs to be solved. Summary of the Invention

[0003] One objective of this invention is to provide an optical imaging lens that is thin, light, and compact in appearance and has excellent imaging quality. Preferably, the optical imaging lens of this invention can provide excellent imaging quality in low-light environments.

[0004] According to an embodiment of the present invention, an optical imaging lens is provided, which includes three lenses along an optical axis from an object side to an image side, namely a first lens, a second lens and a third lens in sequence. Each of the first lens to the third lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through.

[0005] For ease of representation of the parameters referred to in this invention, the following definitions apply in this specification and drawings: T1 represents the thickness of the first lens on the optical axis; T2 represents the thickness of the second lens on the optical axis; T3 represents the thickness of the third lens on the optical axis; G12 represents the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the second lens, i.e., the air gap on the optical axis between the first and second lenses; G23 represents the distance on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, i.e., the air gap on the optical axis between the second and third lenses; G3F represents the distance on the optical axis from the image-side surface of the third lens to the object-side surface of the filter. The distance on the optical axis; TF is the thickness of the filter on the optical axis; GFP represents the distance on the optical axis from the image side of the filter to the imaging plane; AAG represents the sum of the two air gaps on the optical axis from the first lens to the third lens, i.e., the sum of G12 and G23; Tmax is the maximum value of the three thicknesses on the optical axis from the first lens to the third lens, i.e., the maximum value among T1, T2, and T3; Tmin is the minimum value of the three thicknesses on the optical axis from the first lens to the third lens, i.e., the minimum value among T1, T2, and T3; Tavg T1 represents the average thickness of the three lenses (T1, T2, and T3) along the optical axis; Gmax represents the maximum value of the two air gaps (G12 and G23) along the optical axis; ALT represents the total thickness of the three lenses (T1, T2, and T3) along the optical axis; TL represents the distance from the object side of the first lens to the image side of the third lens along the optical axis; TTL represents the system length of the optical imaging lens, i.e., the distance from the object side of the first lens to the image side of the third lens along the optical axis; BFL represents the back focal length of the optical imaging lens, i.e., the distance from the image side of the third lens to the image surface along the optical axis. The on-axis distance is the sum of G3F, TF, and GFP; ImgH represents the maximum image height of the optical imaging lens; HFOV represents the half field of view (half of the maximum angle of view) of the optical imaging lens; EFL represents the effective focal length of the optical imaging lens; f1 represents the focal length of the first lens; f2 represents the focal length of the second lens; f3 represents the focal length of the third lens; n1 represents the nd refractive index of the first lens; n2 represents the nd refractive index of the second lens; n3 represents the nd refractive index of the third lens; V1 represents the Vd Abbe number of the first lens; V2 represents the Vd Abbe number of the second lens; V3 represents the Vd Abbe number of the third lens; Fno represents the aperture value of the optical imaging lens.

[0006] Please note that the lens material parameters disclosed in the optical parameter tables of this invention are in the international glass code format using the nd refractive index and Vd Abbe number, so that those skilled in the art can understand 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 parameter tables of each embodiment are calculated based on the refractive index of the wavelength band in which the optical system is implemented. Since the primary wavelength of the embodiments of this invention is 465 nm, the focal length values ​​of this invention are calculated based on the refractive index of the material at 465 nm.

[0007] According to the first aspect of the present invention, an optical imaging lens is provided, wherein an optical axis region on the image side of the first lens is concave or a circumferential region on the object side of the second lens is convex, an optical axis region on the object side of the third lens is convex, and a circumferential region on the image side of the third lens is concave. The optical imaging lens has only the aforementioned three lenses and satisfies the condition (1): Fno*(EFL+ImgH) / ALT≦5.200 and the condition (2): HFOV*TTL / BFL≦55.000°.

[0008] According to the second aspect of the present invention, an optical imaging lens is provided, wherein a circumferential region on the object side of the second lens is convex, an optical axis region on the object side of the third lens is convex, and an optical axis region on the image side of the third lens is concave. The optical imaging lens has only the aforementioned three lenses and satisfies condition (1) and condition (2).

[0009] According to the third aspect of the present invention, an optical imaging lens is provided, wherein a circumferential region on the image side of the third lens is concave, the optical imaging lens has only the aforementioned three lenses, and satisfies the preferred range of condition (1) and condition (2): HFOV*TTL / BFL≦35.000°.

[0010] Secondly, the present invention can selectively control the aforementioned parameters to make the optical imaging lens more satisfied with at least one of the following conditions: Condition (3) states that BFL / (Fno*ImgH)≥1.000. Fno*(EFL+ImgH) / (T1+BFL)≤2.900 Condition (4); Condition (5) is given by Fno*(EFL+ImgH) / BFL≤4.600. (Fno*EFL) / (T1+BFL)≤2.600 Condition (6); (TL+ImgH) / Gmax≥8.900 condition (7); (EFL+ImgH) / ALT≤3.200 Condition (8); Condition (9) is: Fno*EFL / ALT≤4.800; Condition (10) ≤ Fno*EFL / BFL ≤ 3.800; BFL / (TTL*tan(HFOV))≥1.000 condition (11); Condition (12) is: Fno*HFOV / BFL≤52.000° / mm. HFOV*TTL / (T1+BFL)≤25.000° Condition (13); HFOV*EFL / BFL≤40.000° Condition (14); Condition (15) ≤ TTL / BFL ≤ 4.000; ALT / AAG≥2.500 condition (16); BFL / AAG≥3.600 condition (17); (Tmax+Tmin) / AAG≥1.800 condition (18); EFL / BFL≤2.900 condition (19); BFL / ImgH ≥ 1.400 condition (20); Condition (21) TL / BFL≤3.000; BFL / Tavg≥1.100 condition (22); (TL+ImgH) / AAG≥4.500 condition (23); (T1+BFL) / (Fno*ImgH)≥2.400 Condition (24); (T1+BFL) / ImgH≥3.000 condition (25); and / or HFOV*AAG / BFL≤3.900° Condition (26).

[0011] The exemplary limiting conditions listed above can be selectively combined and applied in varying numbers to embodiments of the present invention, and are not limited thereto. In implementing the present invention, in addition to the aforementioned conditions, further details such as the arrangement of concave and convex surfaces, refractive index variations, selection of various materials, or other detailed structures can be designed for a single lens or, more broadly, multiple lenses to enhance control over system performance and / or resolution. It should be noted that these details should be selectively combined and applied to other embodiments of the present invention, provided there is no conflict.

[0012] As can be seen from the above, the optical imaging lens of the present invention can have good imaging quality, a thin and small appearance, and a high amount of light intake even in low-light environments, thereby improving imaging quality. Attached Figure Description

[0013] Figure 1 This diagram shows a cross-sectional view of a lens according to one embodiment of the present invention. Figure 2 Draw a schematic diagram showing the relationship between the lens surface shape and the focal point of the light rays; Figure 3 Draw a diagram showing the surface shape of the lens region and the relationship between the region boundaries in Example 1; Figure 4 Draw a diagram showing the surface shape of the lens region and the relationship between the region boundaries in Example 2; Figure 5 Draw a diagram showing the surface shape of the lens region and the relationship between the region boundaries in Example 3; Figure 6 This diagram shows a cross-sectional view of a three-element lens of an optical imaging lens according to a first embodiment of the present invention. Figure 7 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to the first embodiment of the present invention; wherein, A is a diagram of longitudinal spherical aberration, B is field curvature aberration in the sagittal direction, C is field curvature aberration in the meridional direction, and D is distortion aberration; Figure 8 This displays detailed optical data of each lens of the optical imaging lens according to the first embodiment of the present invention; Figure 9 Displaying aspherical data of an optical imaging lens according to a first embodiment of the present invention; Figure 10 This diagram shows a cross-sectional view of a three-element lens of an optical imaging lens according to a second embodiment of the present invention. Figure 11 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to a second embodiment of the present invention; wherein, A is a diagram of longitudinal spherical aberration, B is field curvature aberration in the sagittal direction, C is field curvature aberration in the meridional direction, and D is distortion aberration; Figure 12 This displays detailed optical data for each lens of the optical imaging lens according to the second embodiment of the present invention; Figure 13 Displaying aspherical data of an optical imaging lens according to a second embodiment of the present invention; Figure 14 This diagram shows a cross-sectional view of a three-element lens of an optical imaging lens according to a third embodiment of the present invention. Figure 15This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to a third embodiment of the present invention; wherein, A is a diagram of longitudinal spherical aberration, 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 This displays detailed optical data for each lens of the optical imaging lens according to the third embodiment of the present invention; Figure 17 Displaying aspherical data of an optical imaging lens according to a third embodiment of the present invention; Figure 18 This diagram shows a cross-sectional view of a three-element lens of an optical imaging lens according to a fourth embodiment of the present invention. Figure 19 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to the fourth embodiment of the present invention; wherein, A is a diagram of longitudinal spherical aberration, B is field curvature aberration in the sagittal direction, C is field curvature aberration in the meridional direction, and D is distortion aberration; Figure 20 This displays detailed optical data for each lens of the optical imaging lens according to the fourth embodiment of the present invention; Figure 21 Displaying aspherical data of an optical imaging lens according to a fourth embodiment of the present invention; Figure 22 This diagram shows a cross-sectional view of a three-element lens of an optical imaging lens according to a fifth embodiment of the present invention. Figure 23 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to the fifth embodiment of the present invention; wherein, A is a diagram of longitudinal spherical aberration, 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 This displays detailed optical data for each lens of the optical imaging lens according to the fifth embodiment of the present invention; Figure 25 Displaying aspherical data of an optical imaging lens according to a fifth embodiment of the present invention; Figure 26 This diagram shows a cross-sectional view of a three-element lens of an optical imaging lens according to a sixth embodiment of the present invention. Figure 27 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to the sixth embodiment of the present invention; wherein, A is a diagram of longitudinal spherical aberration, B is field curvature aberration in the sagittal direction, C is field curvature aberration in the meridional direction, and D is distortion aberration; Figure 28 This displays detailed optical data for each lens of the optical imaging lens according to the sixth embodiment of the present invention; Figure 29Displaying aspherical data of an optical imaging lens according to a sixth embodiment of the present invention; Figure 30 Table 1 lists the numerical values ​​of the parameter combinations in the first to sixth embodiments above; Figure 31 Table 2 lists the numerical values ​​of the parameter combinations in the first to sixth embodiments above.

[0014] Figure label: 1, 2, 3, 4, 5, 6: Optical imaging lenses; 100, 200, 300, 400, 500: Lenses; 130: Assembly section; 211, 212: Parallel rays; STO: Aperture; L1: First lens; L2: Second lens; L3: Third lens; TF: Filter; IMA: Imaging Surface; 110, 410, 510, L1A1, L2A1, L3A1, TFA1: Side view of the object; 120, 320, L1A2, L2A2, L3A2, TFA2: Image from the side; Z1, L1A1C, L1A2C, L2A1C, L2A2C, L3A1C, L3A2C: Optical axis region; Z2, L1A1P, L1A2P, L2A1P, L2A2P, L3A1P, L3A2P: Circular region; A1: Object side; A2: Image side; CP: Center point; CP1: First center point; CP2: Second center point; TP1: First conversion point; TP2: Second conversion point; OB: Optical boundary; I: Optical axis; Lc: Principal ray; Lm: Edge ray; EL: Extension line; Z3: Relay area; M, R: Intersection point. Detailed Implementation

[0015] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The elements in the drawings are not drawn to scale, and similar element symbols are generally used to represent similar elements.

[0016] 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.

[0017] The optical system described in this specification includes at least one lens that receives imaging rays incident on the optical system, ranging from parallel to the optical axis to within a half-field-of-view (HFOV) angle relative to the optical axis. The imaging rays 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.

[0018] 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).

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The optical imaging lens of this invention comprises three lenses arranged along an optical axis from the object side to the image side, sequentially including a first lens, a second lens, and a third lens. Each of the first to third lenses includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through. By designing the detailed features of each lens and satisfying a specific range of parameter combinations, the optical imaging lens of this invention achieves excellent image quality, a slim and compact appearance, and provides excellent image quality even in low-light environments.

[0031] The optical imaging lens of this invention can use a smaller aperture value and appropriately coordinate the system focal length and maximum image height to match the total thickness of all lenses, satisfying condition (1): Fno*(EFL+ImgH) / ALT≤5.200. This will help correct distortion and spherical aberration while allowing a larger light flux into the system, thus improving the overall imaging quality. At this time, the half-angle can be matched with the system length and back focal length ratio to satisfy condition (2): HFOV*TTL / BFL≤55.000°, which will help reduce the space occupied by the lens. If the optical axis area of ​​the first lens image side is concave or the circumferential area of ​​the second lens object side is convex, the optical axis area of ​​the third lens object side is convex, and the circumferential area of ​​the third lens image side is concave, the imaging quality of the central and edge fields of view of the imaging plane can be further improved. Preferably, the preferred range of condition (1) can be further satisfied: 0.650≤Fno*(EFL+ImgH) / ALT≤5.200, or the preferred range of condition (2) can be satisfied: HFOV*TTL / BFL≤35.000°, and more preferably, the preferred range of condition (2) can be further satisfied: 10.000°≤HFOV*TTL / BFL≤35.000°.

[0032] The optical imaging lens of this invention can use a smaller aperture value and appropriately coordinate the system focal length and maximum image height to match the total thickness of all lenses, thereby satisfying condition (1). This will help correct distortion and spherical aberration while allowing a larger light flux into the system, thus improving the overall image quality. At this time, by further matching the half-angle with the system length and back focal length ratio, condition (2) can be satisfied, which will help reduce the space occupied by the lens. If the surface shape is further combined with the second lens having a convex circumferential area on the object side, the third lens having a convex optical axis area on the object side, and the third lens having a concave optical axis area on the image side, the imaging quality of the central and peripheral fields of view of the imaging plane can be further improved. Preferably, the preferred range of condition (1) can be further satisfied: 0.650≤Fno*(EFL+ImgH) / ALT≤5.200, or the preferred range of condition (2) can be satisfied: HFOV*TTL / BFL≤35.000°, and more preferably, the preferred range of condition (2) can be further satisfied: 10.000°≤HFOV*TTL / BFL≤35.000°.

[0033] The optical imaging lens of the present invention can use a smaller aperture value and appropriately coordinate the system focal length and maximum image height to match the total thickness of all lenses to satisfy conditional equation (1). This will help correct distortion and spherical aberration while allowing a larger light flux into the system, thereby improving the overall imaging quality. At this time, the system length and back focal length ratio can be matched with the half-angle view to satisfy the preferred range of conditional equation (2): HFOV*TTL / BFL≤35.000°. This will not only help reduce the space occupied by the lens, but also further reduce the field curvature aberration of the system. If the circumferential area of ​​the image side of the third lens is concave, the imaging quality of the edge field of view of the imaging plane can be further improved. Preferably, the preferred range of conditional equation (1) can be further satisfied: 0.650≤Fno*(EFL+ImgH) / ALT≤5.200, or the preferred range of conditional equation (2): 10.000°≤HFOV*TTL / BFL≤35.000°.

[0034] To achieve better image quality by reducing distortion and aberrations at the edges of the field of view while shortening the system length, in addition to balancing the relationship between the back focal length and image height or the system length and focal length, this can also be achieved by adjusting the thickness of each lens and the air gap in the system. With a suitable aperture value, the amount of light transmitted can be further increased. Under the numerical constraints of the following conditional expressions, embodiments of the present invention can have a better configuration, improving aberrations and distortions of the optical imaging lens. When a better range is met, spherical aberration can be further improved: Condition (3): BFL / (Fno*ImgH)≥1.000, with a preferred range of 1.000≦BFL / (Fno*ImgH)≦10.000; Condition (4): Fno*(EFL+ImgH) / (T1+BFL)≤2.900, the preferred range is 0.350≦Fno*(EFL+ImgH) / (T1+BFL)≦2.900; Condition (5): Fno*(EFL+ImgH) / BFL≤4.600, the preferred range is 0.500≦Fno*(EFL+ImgH) / BFL≦4.600; Condition (6): (Fno*EFL) / (T1+BFL)≤2.600, the preferred range is 0.250≦(Fno*EFL) / (T1+BFL)≦2.600; Condition (7): (TL+ImgH) / Gmax≥8.900, the preferred range is 8.900≦(TL+ImgH) / Gmax≥8.900≦29.000; Condition (8): (EFL+ImgH) / ALT≤3.200, the preferred range is 0.900≦(EFL+ImgH) / ALT≦3.200; Condition (9): Fno*EFL / ALT≤4.800, the preferred range is Fno*EFL / ALT≦4.500, and the even better range is 0.500≦Fno*EFL / ALT≦4.500; Condition (10): Fno*EFL / BFL≤3.800, the preferred range is 0.400≦Fno*EFL / BFL≦3.800; Condition (11): BFL / (TTL*tan(HFOV))≥1.000, with a preferred range of 1.000≦BFL / (TTL*tan(HFOV))≦5.800; Condition (12): Fno*HFOV / BFL≤52.000° / mm, the preferred range is 6.000° / mm≦(Fno*HFOV) / BFL≦52.000° / mm; Condition (13): HFOV*TTL / (T1+BFL)≤25.000°, the preferred range is 6.500°≦HFOV*TTL / (T1+BFL)≦25.000°; Condition (14): HFOV*EFL / BFL≤40.000°, the preferred range is 7.200≤HFOV*EFL / BFL≤40.000°; Condition (15): TTL / BFL≤4.000, with a preferred range of 1.800≤TTL / BFL≤4.000; Condition (16): ALT / AAG ≥ 2.500, with the preferred range being 2.500 ≤ ALT / AAG ≤ 11.000; Condition (17): BFL / AAG ≥ 3.600, with a preferred range of 3.600 ≤ BFL / AAG ≤ 14.000; Condition (18): (Tmax+Tmin) / AAG≥1.800, the optimal range is 1.800≤ (Tmax+Tmin) / AAG≤8.500; Condition (19): EFL / BFL≤2.900, the preferred range is 0.600≤EFL / BFL≤2.900; Condition (20): BFL / ImgH ≥ 1.400, with a preferred range of 1.400 ≤ BFL / ImgH ≤ 6.700; Condition (21): TL / BFL≤3.000, with a preferred range of 0.850≤TL / BFL≤3.000; Condition (22): BFL / Tavg≥1.100, with a preferred range of 1.100≤BFL / Tavg≤4.900; Condition (23): (TL+ImgH) / AAG≥4.500, the preferred range is 4.500≤ (TL+ImgH) / AAG≤14.500; Condition (24): (T1+BFL) / (Fno*ImgH)≥2.400, the preferred range is 2.400≤(T1+BFL) / (Fno*ImgH)≤14.000; Condition (25): (T1+BFL) / ImgH≥3.000, with a preferred range of 3.000≤(T1+BFL) / ImgH≤10.000; Condition (26): HFOV*AAG / BFL≤3.900°, the preferred range is ≤ 0.350°≤HFOV*AAG / BFL≤3.900°.

[0035] 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.

[0036] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the system length, 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 lens weight and save costs.

[0037] In implementing this invention, in addition to the above-described conditional expressions, other additional details or structures, such as concave-convex surface arrangements, refractive index variations, or other features, can be designed for a single lens or, more broadly, for multiple lenses, as shown in the following embodiments, to enhance control over system size, performance, resolution, and / or improve manufacturing yield. Furthermore, regarding material design, all lenses in the optical imaging lens of this invention are made of plastic to reduce lens weight and save costs, but lenses made of various materials such as glass and resin can also be used. It should be noted that these details should be selectively incorporated into other embodiments of this invention without conflict, and are not limited thereto.

[0038] To illustrate that the present invention can indeed increase the field of view and reduce the aperture value while providing good optical performance, several embodiments and their detailed optical data are provided below. Please refer to the following first. Figures 6 to 9 ,in Figure 6 This diagram shows a cross-sectional view of the three-element lens of the optical imaging lens according to the first embodiment of the present invention. Figure 7 This diagram shows the longitudinal spherical aberration and various aberrations of the optical imaging lens according to the first embodiment of the present invention. Figure 8 This displays detailed optical data of the optical imaging lens according to the first embodiment of the present invention. Figure 9 This displays the aspherical data of each lens of the optical imaging lens according to the first embodiment of the present invention.

[0039] like Figure 6 As shown, the optical imaging lens 1 of this embodiment includes, from the object side A1 to the image side A2, a first lens L1, an aperture stop STO, a second lens L2, and a third lens L3. A filter TF and an imaging surface IMA of an image sensor are both disposed on the image side A2 of the optical imaging lens 1. In this embodiment, the filter TF is disposed between the third lens L3 and the imaging surface IMA. It can be selected to filter out specific wavelengths as needed to prevent light of that specific wavelength from being transmitted to the imaging surface IMA and affecting the image quality.

[0040] Preferably, the filter TF in this embodiment and subsequent embodiments satisfies the following conditions: average transmittance of light in the 360-380 nm band ≤ 5%; average transmittance of light in the 400-500 nm band ≥ 90%; and average transmittance of light in the 550-1150 nm band ≤ 5%. This will facilitate the application of the optical imaging lens 1 in the 400-500 nm blue light wavelength range and significantly improve field curvature, distortion, or longitudinal spherical aberration, reflecting good MTF (Modulation Transfer Function) resolution and imaging quality. More preferably, the filter TF in this embodiment further satisfies the following conditions: average transmittance of light in the 360-380 nm band ≤ 3%; average transmittance of light in the 400-500 nm band ≥ 95%; and average transmittance of light in the 550-1150 nm band ≤ 3%.

[0041] The first lens L1, the second lens L2, and the third lens L3 of the optical imaging lens 1 are exemplaryly made of plastic material, but are not limited to this, and may also be made of other materials, such as glass and resin. For example, plastic materials include, but are not limited to, APL5014CL_14, EP9000, N-BK7, and the like.

[0042] The first lens L1, the second lens L2, and the third lens L3 form a detailed structure as follows: The first lens L1 has a positive refractive index and has an object-side surface L1A1 facing the object side A1 and an image-side surface L1A2 facing the image side A2. The optical axis region L1A1C and its circumferential region L1A1P of the object-side surface L1A1 are both convex, while the optical axis region L1A2C and its circumferential region L1A2P of the image-side surface L1A2 are both concave.

[0043] The second lens L2 has a positive refractive index and has an object-side surface L2A1 facing the object side A1 and an image-side surface L2A2 facing the image side A2. The optical axis region L2A1C and its circumferential region L2A1P of the object-side surface L2A1 are both convex, and the optical axis region L2A2C and its circumferential region L2A2P of the image-side surface L2A2 are both convex.

[0044] The third lens L3 has a positive refractive index and has an object-side surface L3A1 facing the object side A1 and an image-side surface L3A2 facing the image side A2. The optical axis region L3A1C and its circumferential region L3A1P of the object-side surface L3A1 are both convex, while the optical axis region L3A2C and its circumferential region L3A2P of the image-side surface L3A2 are both concave.

[0045] In this embodiment, air gaps exist between each lens L1, L2, L3, filter TF, and imaging surface IMA of the image sensor. However, it is not limited to this. In other embodiments, the surface contours of any two opposing lenses can be designed to correspond to each other and fit together to eliminate the air gaps between them.

[0046] For the optical characteristics and distance values ​​of each lens in the optical imaging lens 1 of this embodiment, please refer to... Figure 8 Therefore, the effective focal length (EFL) of the optical imaging lens 1 in this embodiment is 0.806 mm, the half field of view (HFOV) is 11.868 degrees, the aperture (F-number, Fno) is 0.706, the image height is 0.200 mm, and its system length (TTL) is 1.352 mm. For the numerical values ​​of the various parameter combinations in the design, please refer to... Figure 30 .

[0047] The object-side surface L1A1 and image-side surface L1A2 of the first lens L1, the object-side surface L2A1 and image-side surface L2A2 of the second lens L2, and the object-side surface L3A1 and image-side surface L3A2 of the third lens L3, a total of six aspherical surfaces, are all defined according to the following aspherical curve formula:

[0048] Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I; Z represents the depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis and the tangent plane at the vertex on the optical axis of the aspherical surface); R represents the radius of curvature of the lens surface near the optical axis; K is the conic constant; a i These are the coefficients of the i-th order aspherical surface. Please refer to the detailed data for the parameters of each aspherical surface. Figure 9Please note that all values ​​not listed are zero, such as the a2 aspheric coefficient of each aspheric surface in this embodiment, which is zero. Subsequent embodiments follow the same principle, and therefore will not be repeated.

[0049] Figure 7 Part A illustrates a schematic diagram of the longitudinal spherical aberration of this embodiment, with the horizontal axis representing the longitudinal spherical aberration and the vertical axis representing the field of view. Figure 7 Part B illustrates a schematic diagram of the field curvature aberration in the sagittal direction of this embodiment. Figure 7 Part C illustrates a schematic diagram of field curvature aberration in the meridional direction of this embodiment, with the horizontal axis representing field curvature aberration and the vertical axis representing image height. Figure 7 Part D illustrates the distortion aberration of this embodiment, with the horizontal axis representing percentage and the vertical axis representing image height. Off-axis rays at different heights for three representative wavelengths (440 nm, 465 nm, 480 nm) are concentrated near the imaging point. The skewness of each curve shows that the imaging point deviation of off-axis rays at different heights is controlled within -0.038 to 0.0304 mm, significantly improving spherical aberration at different wavelengths. Field curvature aberration in the sagittal direction falls within -38 to 0 µm, and field curvature aberration in the meridional direction falls within -38 to 15.2 µm, while distortion aberration remains within 0 to 9.5%.

[0050] The data above shows that the various optical characteristics of the optical imaging lens 1 meet the imaging quality requirements of the optical system. Therefore, it can be concluded that the optical imaging lens 1 of this first preferred embodiment, compared to existing optical lenses, can still effectively provide better imaging quality while providing a system length of 1.352 mm.

[0051] refer to Figures 10 to 13 , Figure 10 This diagram shows a cross-sectional view of the three-element lens of the optical imaging lens according to a second embodiment of the present invention. Figure 11 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to a second embodiment of the present invention. Figure 12 Detailed optical data of the optical imaging lens according to the second embodiment of the present invention are shown. Figure 13 The aspherical data of each lens of the optical imaging lens according to the second embodiment of the present invention are shown, and please note that those not listed are all zero. Figure 10 As shown in the figure, the optical imaging lens 2 of this embodiment includes a first lens L1, an aperture STO, a second lens L2 and a third lens L3 in sequence from the object side A1 to the image side A2.

[0052] The surface concavity and convexity configuration of the object-side surfaces L1A1, L2A1, L3A1 facing the object side A1 and the image-side surfaces L2A2, L3A2 facing the image side A2 in the second embodiment, as well as the positive and negative refractive index configuration of each lens, are generally similar to those in the first embodiment. However, the second embodiment differs from the first embodiment in terms of related optical parameters such as radius of curvature, lens thickness, aspherical coefficient, and back focal length, and in the surface concavity and convexity configuration of the image-side surface L1A2. Specifically, the difference in surface concavity and convexity configuration lies in the fact that the circumferential region L1A2P of the image-side surface L1A2 of the first lens L1 is convex. For information on the optical characteristics and distance values ​​of each lens in the optical imaging lens 2 of this embodiment, please refer to... Figure 12 As can be seen, the optical imaging lens 2 in this embodiment has an EFL of 1.511 mm, an HFOV of 9.114 degrees, an Fno of 1.630, an image height of 0.245 mm, and a TTL of 1.662 mm. For the numerical values ​​of the various parameter combinations in the design, please refer to... Figure 30 .

[0053] from Figure 11 In the longitudinal spherical aberration of part A, the skewness of each curve shows that the imaging point deviation of off-axis rays at different heights is controlled within -0.018 to 0.0126 mm. From... Figure 11 In the field curvature aberration of the sagittal direction in part B, the focal length variation of the three representative wavelengths (440 nm, 465 nm, 480 nm) falls within -21 to 0 µm across the entire field of view. From Figure 11 In the meridional field curvature aberration of part C, the focal length variation of the three representative wavelengths falls within -21 to 8.4 µm across the entire field of view. Figure 11 Part D shows that the distortion aberration of the optical imaging lens 2 is maintained within the range of 0 to 0.21%. Compared with the first embodiment, this embodiment shows smaller longitudinal spherical aberration, sagittal and meridional field curvature aberration, and distortion aberration.

[0054] The data above shows that the various optical characteristics of the optical imaging lens 2 meet the imaging quality requirements of the optical system. Therefore, the optical imaging lens 2 of this embodiment, compared to existing optical lenses, can still effectively provide better imaging quality while providing a system length of 1.662 mm.

[0055] refer to Figures 14 to 17 , Figure 14 This diagram shows a cross-sectional view of a three-element lens in an optical imaging lens according to a third embodiment of the present invention. Figure 15 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to a third embodiment of the present invention. Figure 16 Detailed optical data of the optical imaging lens according to the third embodiment of the present invention are displayed. Figure 17This displays the aspherical data of each lens in the optical imaging lens according to the third embodiment of the present invention, and note that those not listed are all zero. For example... Figure 14 As shown in the figure, the optical imaging lens 3 of this embodiment includes a first lens L1, an aperture STO, a second lens L2 and a third lens L3 in sequence from the object side A1 to the image side A2.

[0056] The surface irregularities of the object-side surfaces L1A1, L2A1, L3A1 facing the object side A1 and the image-side surfaces L2A2, L3A2 facing the image side A2 in the third embodiment, as well as the positive and negative refractive index configurations of the lenses other than the first lens L1, are generally similar to those in the first embodiment. However, the third embodiment differs from the first embodiment in its related optical parameters such as radius of curvature, lens thickness, aspherical coefficient, and back focal length, the surface irregularity of the image-side surface L1A2, and the fact that the first lens L1 has a negative refractive index. Specifically, the surface irregularity differs in that the circumferential region L1A2P of the image-side surface L1A2 of the first lens L1 is convex. For the optical characteristics and distance values ​​of each lens in the optical imaging lens 3 of this embodiment, please refer to [reference needed]. Figure 16 As can be seen, the optical imaging lens 3 in this embodiment has an EFL of 1.300 mm, an HFOV of 10.821 degrees, an Fno of 1.260, an image height of 0.245 mm, and a TTL of 1.828 mm. For the numerical values ​​of the various parameter combinations in the design, please refer to... Figure 30 .

[0057] from Figure 15 In the longitudinal spherical aberration of part A, the skewness of each curve shows that the imaging point deviation of off-axis rays at different heights is controlled within -0.0175 to 0.00525 mm. From... Figure 15 In the field curvature aberration of the sagittal direction in part B, the focal length variation of the three representative wavelengths (440 nm, 465 nm, 480 nm) falls within -20.4 to 13.6 µm across the entire field of view. Figure 15 In the meridional field curvature aberration of part C, the focal length variation of the three representative wavelengths falls within -20.4 to 34 µm across the entire field of view. Figure 15 The D portion shows that the distortion aberration remains within the range of -2.8% to 0%. Compared with the first embodiment, this embodiment shows smaller longitudinal spherical aberration, sagittal field curvature aberration, and distortion aberration.

[0058] The data above shows that the various optical characteristics of the optical imaging lens 3 meet the imaging quality requirements of the optical system. Therefore, the optical imaging lens 3 of this embodiment, compared to existing optical lenses, can still effectively provide better imaging quality while providing a system length of 1.828 mm.

[0059] refer to Figures 18 to 21 , Figure 18 This diagram shows a cross-sectional view of the three-element lens of the optical imaging lens according to the fourth embodiment of the present invention. Figure 19 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to the fourth embodiment of the present invention. Figure 20 This displays detailed optical data of the optical imaging lens according to the fourth embodiment of the present invention. Figure 21 This displays the aspherical data of each lens in the optical imaging lens according to the fourth embodiment of the present invention, and note that those not listed are all zero. For example... Figure 18 As shown, the optical imaging lens 4 of this embodiment includes a first lens L1, an aperture STO, a second lens L2 and a third lens L3 in sequence from the object side A1 to the image side A2.

[0060] The surface irregularities of the object-side surfaces L1A1, L2A1, L3A1 facing the object side A1 and the image-side surfaces L1A2, L2A2, L3A2 facing the image side A2 in the fourth embodiment, as well as the positive and negative refractive index configurations of the lenses other than the second lens L2, are generally similar to those in the first embodiment. However, the fourth embodiment differs from the first embodiment in terms of the radius of curvature, lens thickness, aspherical coefficient, back focal length, and other related optical parameters, as well as the fact that the second lens L2 has a negative refractive index. For the optical characteristics and distance values ​​of each lens in the optical imaging lens 4 of this embodiment, please refer to [reference needed]. Figure 20 As can be seen, the optical imaging lens 4 in this embodiment has an EFL of 2.545 mm, an HFOV of 5.351 degrees, an Fno of 1.974, an image height of 0.245 mm, and a TTL of 2.481 mm. For the numerical values ​​of the various parameter combinations in the design, please refer to... Figure 30 .

[0061] from Figure 19 In the longitudinal spherical aberration of part A, the skewness of each curve shows that the imaging point deviation of off-axis rays at different heights is controlled within -0.0365 to 0.01095 mm. From... Figure 19 In the field curvature aberration of the sagittal direction in part B, the focal length variation of the three representative wavelengths (440 nm, 465 nm, 480 nm) falls within -37 to 0 µm across the entire field of view. From Figure 19 In the meridional field curvature aberration of part C, the focal length variation of the three representative wavelengths falls within -37 to 25.9 µm across the entire field of view. Figure 19 The D portion shows that the distortion aberration remains within the range of 0~0.46%. Compared with the first embodiment, this embodiment shows smaller longitudinal spherical aberration, sagittal field curvature aberration, and distortion aberration.

[0062] The data above shows that the various optical characteristics of the optical imaging lens 4 meet the imaging quality requirements of the optical system. Therefore, the optical imaging lens 4 of this embodiment, compared to existing optical lenses, can still effectively provide better imaging quality while maintaining a system length of 2.481 mm.

[0063] refer to Figures 22 to 25 , Figure 22 This diagram shows a cross-sectional view of a three-element lens in an optical imaging lens according to a fifth embodiment of the present invention. Figure 23 This diagram shows the longitudinal spherical aberration and various aberrations of an optical imaging lens according to the fifth embodiment of the present invention. Figure 24 Detailed optical data of the optical imaging lens according to the fifth embodiment of the present invention are displayed. Figure 25 This displays the aspherical data of each lens in the optical imaging lens according to the fifth embodiment of the present invention, and note that those not listed are all zero. For example... Figure 22 As shown, the optical imaging lens 5 of this embodiment includes a first lens L1, an aperture STO, a second lens L2 and a third lens L3 in sequence from the object side A1 to the image side A2.

[0064] The surface concavity and convexity configuration of the object-side surfaces L1A1 and L3A1 facing the object side A1 and the image-side surfaces L1A2 and L3A2 facing the image side A2 in the fifth embodiment, as well as the positive and negative refractive index configuration of the first lens L1, are generally similar to those in the first embodiment. However, the fifth embodiment differs from the first embodiment in terms of the radius of curvature, lens thickness, aspherical coefficient, back focal length, and other related optical parameters; the surface concavity and convexity configuration of the object-side surface L2A1 and the image-side surfaces L1A1 and L2A2; the negative refractive index of the second lens L2; ​​and the negative refractive index of the third lens L3. Specifically, the surface concavity and convexity configuration differs in that the circumferential region L1A2P of the image-side surface L1A2 of the first lens L1 is convex, while the optical axis region L2A1C of the object-side surface L2A1 of the second lens L2 is concave, and the optical axis region L2A2C of the image-side surface L2A2 is convex. For the optical characteristics and distance values ​​of each lens in the optical imaging lens 5 of this embodiment, please refer to [reference needed]. Figure 24 As can be seen, the optical imaging lens 5 in this embodiment has an EFL of 1.312 mm, an HFOV of 10.435 degrees, an Fno of 1.260, an image height of 0.245 mm, and a TTL of 1.560 mm. For the numerical values ​​of the various parameter combinations in the design, please refer to... Figure 30 .

[0065] from Figure 23 In the longitudinal spherical aberration of part A, the skewness of each curve shows that the imaging point deviation of off-axis rays at different heights is controlled within -0.0041 to 0.0082 mm. From... Figure 23In the field curvature aberration of the sagittal direction in part B, the focal length variation of the three representative wavelengths (440 nm, 465 nm, 480 nm) falls within -3.3 to 8.8 µm across the entire field of view. Figure 23 In the meridional field curvature aberration of part C, the focal length variation of the three representative wavelengths falls within 0~11 µm across the entire field of view. Figure 23 The D portion shows that the distortion aberration remains within the range of 0~2.5%. Compared with the first embodiment, this embodiment shows smaller longitudinal spherical aberration, sagittal and meridional field curvature aberration, and distortion aberration.

[0066] The data above shows that the various optical characteristics of the optical imaging lens 5 meet the imaging quality requirements of the optical system. Therefore, it can be concluded that the optical imaging lens 5 of this embodiment, compared to existing optical lenses, can still effectively provide better imaging quality while providing a system length of 1.560mm.

[0067] refer to Figures 26 to 29 , Figure 26 This diagram shows a cross-sectional view of a three-element lens in an optical imaging lens according to a sixth embodiment of the present invention. Figure 27 This diagram shows a longitudinal spherical aberration and various aberrations of an optical imaging lens according to a sixth embodiment of the present invention. Figure 28 This displays detailed optical data of the optical imaging lens according to the sixth embodiment of the present invention. Figure 29 This displays the aspherical data of each lens in the optical imaging lens according to the sixth embodiment of the present invention, and note that those not listed are all zero. For example... Figure 26 As shown in the figure, the optical imaging lens 6 of this embodiment includes a first lens L1, an aperture STO, a second lens L2 and a third lens L3 in sequence from the object side A1 to the image side A2.

[0068] The surface concavity and convexity configuration of the object-side surfaces L1A1 and L2A1 facing the object side A1 and the image-side surfaces L1A2 and L3A2 facing the image side A2 in the sixth embodiment, as well as the positive and negative refractive index configuration of each lens except the third lens L3, are generally similar to those in the first embodiment. However, the sixth embodiment differs from the first embodiment in terms of the radius of curvature, lens thickness, aspherical coefficient, back focal length, and other related optical parameters, the surface concavity and convexity configuration of the object-side surface L3A1 and the image-side surface L2A2, and the negative refractive index of the third lens L3. Specifically, the surface concavity and convexity configuration differs in that the optical axis region L2A2C of the image-side surface L2A2 of the second lens L2 is convex, and the circumferential region L3A1P of the object-side surface L3A1 of the third lens L3 is concave. For the optical characteristics and distance values ​​of each lens in the optical imaging lens 6 of this embodiment, please refer to [reference needed]. Figure 28As can be seen, the optical imaging lens 6 in this embodiment has an EFL of 0.976 mm, an HFOV of 13.786 degrees, an Fno of 1.292, an image height of 0.245 mm, and a TTL of 1.375 mm. Compared with the first embodiment, this embodiment has a larger HFOV. For the numerical values ​​of the various parameter combinations in the design, please refer to... Figure 30 .

[0069] from Figure 27 In the longitudinal spherical aberration of part A, the skewness of each curve shows that the imaging point deviation of off-axis rays at different heights is controlled within -0.013 to 0.0039 mm. From... Figure 27 In the field curvature aberration of the sagittal direction in part B, the focal length variation of the three representative wavelengths (440 nm, 465 nm, 480 nm) falls within -13.5 to 18 µm across the entire field of view. From Figure 27 In the meridional field curvature aberration of part C, the focal length variation of the three representative wavelengths falls within -13.5 to 45 µm across the entire field of view. Figure 27 The D portion shows that the distortion aberration remains within the range of 0~1.02%. Compared with the first embodiment, this embodiment shows smaller longitudinal spherical aberration, sagittal field curvature aberration, and distortion aberration.

[0070] The data above shows that the various optical characteristics of the optical imaging lens 6 meet the imaging quality requirements of the optical system. Therefore, the optical imaging lens 6 of this embodiment, compared to existing optical lenses, can still effectively provide better imaging quality while providing a system length of 1.375mm.

[0071] Figure 30 , 31 By listing the numerical values ​​of each parameter combination in the above six embodiments, as well as the detailed optical data and tables of each embodiment, it can be seen that the optical imaging lens of the present invention can indeed satisfy any of the aforementioned conditions (1), (2) and / or conditions (3) to (26).

[0072] The longitudinal spherical aberration, field curvature aberration, and distortion aberration of the optical imaging lens of this invention in all embodiments conform to the usage specifications. Furthermore, off-axis rays of the three representative wavelengths 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 rays at different heights is controlled, demonstrating excellent spherical aberration, aberration, and distortion suppression capabilities. Further review of the imaging quality data reveals that the distances between the three representative wavelengths are also quite close, indicating that this invention exhibits excellent concentration of different wavelengths of light under various conditions, resulting in superior dispersion suppression capabilities. In summary, this invention, through lens design and combination, can produce excellent imaging quality.

[0073] 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.

[0074] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0075] (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.

[0076] 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.

[0077] 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.

Claims

1. An optical imaging lens, comprising, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, The optical axis region of the image side of the first lens is concave, or the circumferential region of the object side of the second lens is convex. The optical axis region on the side of the third lens is convex. A circumferential region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: Fno*(EFL+ImgH) / ALT≦5.200 and HFOV*TTL / BFL≦55.000°, Wherein, Fno represents the aperture value of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, ImgH represents the maximum image height of the optical imaging lens, ALT represents the total thickness of the three lenses from the first lens to the third lens on the optical axis, HFOV represents the half field of view of the optical imaging lens, TTL represents the system length of the optical imaging lens, and BFL represents the back focal length of the optical imaging lens.

2. An optical imaging lens, comprising, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, A circumferential region on the side of the object of the second lens is convex. The optical axis region on the side of the third lens is convex. The optical axis region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: Fno*(EFL+ImgH) / ALT≦5.200 and HFOV*TTL / BFL≦55.000°, Wherein, Fno represents the aperture value of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, ImgH represents the maximum image height of the optical imaging lens, ALT represents the total thickness of the three lenses from the first lens to the third lens on the optical axis, HFOV represents the half field of view of the optical imaging lens, TTL represents the system length of the optical imaging lens, and BFL represents the back focal length of the optical imaging lens.

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, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, A circumferential region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: Fno*(EFL+ImgH) / ALT≦5.200 and HFOV*TTL / BFL≦35.000°, Wherein, Fno represents the aperture value of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, ImgH represents the maximum image height of the optical imaging lens, ALT represents the total thickness of the three lenses from the first lens to the third lens on the optical axis, HFOV represents the half field of view of the optical imaging lens, TTL represents the system length of the optical imaging lens, and BFL represents the back focal length of the optical imaging lens.

4. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies BFL / (Fno*ImgH)≥1.

000.

5. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies Fno*(EFL+ImgH) / (T1+BFL)≤2.900, where T1 represents the thickness of the first lens on the optical axis.

6. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies Fno*(EFL+ImgH) / BFL≤4.

600.

7. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies (Fno*EFL) / (T1+BFL)≤2.600, where T1 represents the thickness of the first lens on the optical axis.

8. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies (TL+ImgH) / Gmax≥8.900, where TL represents the distance on the optical axis from the object side of the first lens to the image side of the third lens, and Gmax is the maximum value of the two air gaps on the optical axis between the first lens and the third lens.

9. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies (EFL+ImgH) / ALT≤3.

200.

10. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens also meets the requirement of Fno*EFL / ALT≤4.

800.

11. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies Fno*EFL / BFL≤3.

800.

12. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies BFL / (TTL*tan(HFOV))≥1.

000.

13. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens also meets the requirement of Fno*HFOV / BFL≤52.000° / mm.

14. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies HFOV*TTL / (T1+BFL)≤25.000°, where T1 represents the thickness of the first lens on the optical axis.

15. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies HFOV*EFL / BFL≤40.000°.

16. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens also meets the requirement of TTL / BFL≤4.

000.

17. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies ALT / AAG≥2.500, where AAG represents the sum of the two air gaps on the optical axis from the first lens to the third lens.

18. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies BFL / AAG≥3.600, where AAG represents the sum of the two air gaps on the optical axis from the first lens to the third lens.

19. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies (Tmax+Tmin) / AAG≥1.800, where Tmax is the maximum value of the three thicknesses of the first lens to the third lens on the optical axis, Tmin is the minimum value of the three thicknesses of the first lens to the third lens on the optical axis, and AAG represents the sum of the two air gaps of the first lens to the third lens on the optical axis.

20. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens also meets the requirement of EFL / BFL≤2.

900.

21. 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, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, A circumferential region on the side of the object of the second lens is convex. The optical axis region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: (T1+BFL) / (Fno*ImgH)≥1.600 and Fno*EFL / ALT≤4.800, Wherein, T1 represents the thickness of the first lens on the optical axis, BFL represents the back focal length of the optical imaging lens, Fno represents the aperture value of the optical imaging lens, ImgH represents the maximum image height of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, and ALT represents the total thickness of the three lenses from the first lens to the third lens on the optical axis.

22. 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, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, A circumferential region on the side of the object of the second lens is convex. The optical axis region on the side of the third lens is convex. The optical axis region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: (T1+BFL) / ImgH≥3.000 and Fno*EFL / ALT≤4.500, Wherein, T1 represents the thickness of the first lens on the optical axis, BFL represents the back focal length of the optical imaging lens, ImgH represents the maximum image height of the optical imaging lens, Fno represents the aperture value of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, and ALT represents the total thickness of the three lenses from the first lens to the third lens on the optical axis.

23. 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, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, The optical axis region on the image side of the first lens is concave; A circumferential region on the image side of the second lens is concave. A circumferential region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: HFOV*AAG / BFL≤3.900° and Fno*EFL / ALT≤4.800, Wherein, HFOV represents the half field of view of the optical imaging lens, AAG represents the sum of the two air gaps between the first lens and the third lens on the optical axis, BFL represents the back focal length of the optical imaging lens, Fno represents the aperture value of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, and ALT represents the sum of the thicknesses of the three lenses between the first lens and the third lens on the optical axis.

24. 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, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, The optical axis region on the image side of the first lens is concave; A circumferential region on the image side of the second lens is concave. A circumferential region on the image side of the third lens is concave; and The optical imaging lens has only the aforementioned three lenses and satisfies the following condition: HFOV*AAG / BFL≤3.900° and Fno*(EFL+ImgH) / ALT≤5.200, Wherein, HFOV represents the half field of view of the optical imaging lens, AAG represents the sum of the two air gaps between the first lens and the third lens on the optical axis, BFL represents the back focal length of the optical imaging lens, Fno represents the aperture value of the optical imaging lens, EFL represents the effective focal length of the optical imaging lens, ImgH represents the maximum image height of the optical imaging lens, and ALT represents the sum of the thicknesses of the three lenses between the first lens and the third lens on the optical axis.

25. 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, and a third lens, wherein each of the first lens to the third 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 imaging light passes; characterized in that: in, The optical imaging lens has only the three lenses mentioned above, and The optical imaging lens includes a filter that satisfies the following conditions: The average transmittance of light in the 360 ​​~ 380 nm wavelength band is ≤5%; The average transmittance of light in the 400 ~ 500 nm wavelength band is ≥90%; The average transmittance of light in the 550 ~ 1150 nm band is ≤5%.

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