Optical lens

Abstract

The invention discloses an optical lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, each of the first to fifth lenses includes an object side surface facing the object side and allowing an imaging light to pass through and an image side surface facing the image side and allowing the imaging light to pass through. Wherein the second lens has a negative refractive index, a circumferential area of the image side surface of the third lens is a convex surface, the fifth lens has a positive refractive index, an optical axis area of the image side surface of the fifth lens is a convex surface, and the optical lens only comprises the five lenses.

Description

Technical Field

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

[0002] Optical lenses are primarily used for capturing images and videos, and are applied in portable electronic products such as mobile phones, cameras, tablets, personal digital assistants (PDAs), and head-mounted displays (AR, VR, MR). In recent years, with the continuous evolution of optical lenses, their applications have become even broader, extending beyond just image and video capture to include environmental monitoring, dashcam photography, virtual reality trackers (VR trackers), and facial recognition. However, in addition to the requirement for slim and compact lenses, various structural variations are also becoming increasingly common. Therefore, designing an optical lens that is both slim and compact, has sufficient space to accommodate various structural variations, and possesses excellent optical quality has become a challenge that needs to be addressed. Summary of the Invention

[0003] The present invention provides an optical lens that is thin, compact, and has sufficient space to accommodate various structural changes while maintaining the small size and excellent optical quality of the second to fifth lenses.

[0004] This invention provides an optical lens comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each of the first to fifth lenses includes an object-side surface facing the object side and allowing an imaging ray to pass through, and an image-side surface facing the image side and allowing the imaging ray to pass through. The second lens has a negative refractive index. The third lens has a positive refractive index, and a circumferential region of the image-side surface of the third lens is convex. The fifth lens has a positive refractive index, and a region along the optical axis of the image-side surface of the fifth lens is convex. The optical lens comprises only these five lenses and satisfies the following condition: D11t21 / AAG21t52 ≥ 1.550, where D11t21 is the distance along the optical axis from the object-side surface of the first lens to the object-side surface of the second lens, and AAG21t52 is the sum of the three air gaps along the optical axis from the second lens to the fifth lens.

[0005] The present invention also provides an optical lens comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each of the first to fifth lenses includes an object-side surface facing the object side and through which an imaging ray passes, and an image-side surface facing the image side and through which the imaging ray passes. The second lens has a negative refractive index, and a region along the optical axis of its image-side surface is concave. The third lens has a positive refractive index, and a region along the optical axis of its image-side surface is convex. The fifth lens has a positive refractive index. The optical lens comprises only the aforementioned five lenses and satisfies the following condition: D11t21 / AAG21t52 ≥ 1.550, where D11t21 is the distance along the optical axis from the object-side surface of the first lens to the object-side surface of the second lens, and AAG21t52 is the sum of the three air gaps along the optical axis from the second lens to the fifth lens.

[0006] The present invention also provides an optical lens comprising, sequentially from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each of the first to fifth lenses includes an object-side surface facing the object side through which an imaging ray passes and an image-side surface facing the image side through which the imaging ray passes. The second lens has a negative refractive index. The third lens has a positive refractive index. The fifth lens has a positive refractive index. The optical lens comprises only the aforementioned five lenses and satisfies the following conditions: D11t21 / AAG21t52 ≥ 1.550 and |f1 / EFL2t5| ≥ 36.500, where D11t21 is the distance on the optical axis from the object-side surface of the first lens to the object-side surface of the second lens, AAG21t52 is the sum of the three air gaps on the optical axis from the second to the fifth lens, f1 is the focal length of the first lens, and EFL2t5 is the effective focal length of the second to the fifth lenses of the optical lens.

[0007] Based on the above, the beneficial effects of the optical lens in the embodiments of the present invention are: it has sufficient space to accommodate various structural changes, maintains a small size for the second to fifth lenses, and can converge light rays from different angles, correct aberrations in the central field of view of the imaging plane, and maintain optical quality. Therefore, it can provide a lens that is thin, compact, has sufficient space to accommodate various structural changes, and possesses excellent optical quality.

[0008] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a schematic diagram illustrating the surface structure of a lens.

[0010] Figure 2It is a schematic diagram illustrating the concave and convex structure of a lens and the intersection of light rays.

[0011] Figure 3 This is a schematic diagram illustrating the surface structure of a lens in Example 1.

[0012] Figure 4 This is a schematic diagram illustrating the surface structure of a lens in Example 2.

[0013] Figure 5 This is a schematic diagram illustrating the surface structure of a lens in Example 3.

[0014] Figure 6 This is a schematic diagram of the optical lens according to the first embodiment of the present invention.

[0015] Figures 7A to 7D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the first embodiment.

[0016] Figure 8 Detailed optical data of the optical lens of the first embodiment of the present invention are shown.

[0017] Figure 9 The aspherical parameters of the optical lens according to the first embodiment of the present invention are shown.

[0018] Figure 10 This is a schematic diagram of an optical lens according to a second embodiment of the present invention.

[0019] Figures 11A to 11D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the second embodiment.

[0020] Figure 12 Detailed optical data of the optical lens of the second embodiment of the present invention are shown.

[0021] Figure 13 The aspherical parameters of the optical lens according to the second embodiment of the present invention are shown.

[0022] Figure 14 This is a schematic diagram of an optical lens according to a third embodiment of the present invention.

[0023] Figures 15A to 15D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the third embodiment.

[0024] Figure 16 Detailed optical data of the optical lens according to the third embodiment of the present invention are shown.

[0025] Figure 17 The aspherical parameters of the optical lens according to the third embodiment of the present invention are shown.

[0026] Figure 18 This is a schematic diagram of an optical lens according to the fourth embodiment of the present invention.

[0027] Figures 19A to 19D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the fourth embodiment.

[0028] Figure 20 Detailed optical data of the optical lens according to the fourth embodiment of the present invention are shown.

[0029] Figure 21 The aspherical parameters of the optical lens according to the fourth embodiment of the present invention are shown.

[0030] Figure 22 This is a schematic diagram of the optical lens according to the fifth embodiment of the present invention.

[0031] Figures 23A to 23D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the fifth embodiment.

[0032] Figure 24 Detailed optical data of the optical lens according to the fifth embodiment of the present invention are shown.

[0033] Figure 25 The aspherical parameters of the optical lens according to the fifth embodiment of the present invention are shown.

[0034] Figure 26 This is a schematic diagram of an optical lens according to the sixth embodiment of the present invention.

[0035] Figures 27A to 27D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the sixth embodiment.

[0036] Figure 28 Detailed optical data of the optical lens according to the sixth embodiment of the present invention are shown.

[0037] Figure 29 The aspherical parameters of the optical lens according to the sixth embodiment of the present invention are shown.

[0038] Figure 30 The numerical values ​​of the important parameters and their relationships of the optical lenses of the first to sixth embodiments of the present invention are shown.

[0039] Explanation of reference numerals in the attached figures:

[0040] 0: Aperture; 1: First lens; 2: Second lens; 3: Third lens; 4: Fourth lens; 5: Fifth lens; 8: Filter; 9: Protective cover; 10: Optical lens;

[0041] 15, 25, 35, 45, 55, 85, 95, 110, 410, 510: Side view of the object;

[0042] 16, 26, 36, 46, 56, 86, 96, 120, 320: like a side view;

[0043] 99: Imaging plane;

[0044] 100, 200, 300, 400, 500: Lenses;

[0045] 130: Assembly Department;

[0046] 151, 161, 251, 261, 351, 361, 451, 461, 551, 561, Z1: Optical axis region;

[0047] 153, 163, 253, 263, 353, 363, 453, 463, 553, 563, Z2: Circular region;

[0048] 211, 212: Parallel rays;

[0049] A1: Object side; A2: Image side; CP: Center point; CP 1: First center point; CP2: Second center point;

[0050] EL: Extension line; I: Optical axis; Lc: Principal ray; Lm: Peripheral ray;

[0051] M, R: intersection point; OB: optical boundary;

[0052] TP 1: First switching point; TP2: Second switching point; Z3: Relay area. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] Figure 1This 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).

[0056] 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 the 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 does not have a transition point, 0% to 50% of the distance from the 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 the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential region.

[0057] 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.

[0058] 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.

[0059] See Figure 2Define 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 TP 1 is the boundary between the optical axis region and the circumferential region, that is, the first conversion point TP 1 is the boundary point between the convex surface and the concave surface.

[0060] 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.

[0061] 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.

[0062] Figure 3 This is a radial sectional view of lens 300. See also... Figure 3The 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.

[0063] 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 TP 1, the circumferential region Z2 is convex.

[0064] 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.

[0065] 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. And since its surface shape changes to convex again from the second conversion point TP2, the circumferential region Z2 is convex.

[0066] Figure 5 This is a radial sectional view of lens 500. The object-side surface 510 of lens 500 has no transition point. For a lens surface without a transition point, such as the object-side surface 510 of lens 500, the optical axis region is defined as 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and the circumferential region is defined as 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface. See also Figure 5The 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.

[0067] Figure 6 This is a schematic diagram of the optical lens according to the first embodiment of the present invention. Figures 7A to 7D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the first embodiment. Please refer to [the diagram first]. Figure 6 The optical 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, an aperture 0, a third lens 3, a fourth lens 4, a fifth lens 5, a filter 8, and a protective cover plate 9. When light emitted from an object to be photographed enters the optical lens 10 and passes through the first lens 1, the second lens 2, the aperture 0, the third lens 3, the fourth lens 4, the fifth lens 5, the filter 8, and the protective cover plate 9, an image is formed on an 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 this embodiment, the filter 8 is an infrared cut filter, and the protective cover plate 9 is a glass plate.

[0068] In this embodiment, the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, filter 8, and protective cover plate 9 of the optical lens 10 each have an object-side surface 15, 25, 35, 45, 55, 85, 95 facing the object side A1 and allowing imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 86, 96 facing the image side A2 and allowing imaging light to pass through. In this embodiment, the aperture 0 is disposed between the second lens 2 and the third lens 3.

[0069] The first lens 1 has a negative refractive index. The optical axis region 151 of the object side 15 of the first lens 1 is convex, and its circumferential region 153 is also convex. The optical axis region 161 of the image side 16 of the first lens 1 is concave, and its circumferential region 163 is also concave.

[0070] The second lens 2 has a negative refractive index. The optical axis region 251 of the object-side surface 25 of the second lens 2 is convex, and its circumferential region 253 is also convex. The optical axis region 261 of the image-side surface 26 of the second lens 2 is concave, and its circumferential region 263 is also concave. In this embodiment, both the object-side surface 25 and the image-side surface 26 of the second lens 2 are aspherical surfaces, but the invention is not limited thereto.

[0071] The third lens 3 has a positive refractive index. The optical axis region 351 of the object-side surface 35 of the third lens 3 is convex, and its circumferential region 353 is also convex. The optical axis region 361 of the image-side surface 36 of the third lens 3 is convex, and its circumferential region 363 is also convex. In this embodiment, both the object-side surface 35 and the image-side surface 36 of the third lens 3 are aspherical, but the present invention is not limited thereto.

[0072] The fourth lens 4 has a positive refractive index. The optical axis region 451 of the object-side surface 45 of the fourth lens 4 is convex, and its circumferential region 453 is concave. The optical axis region 461 of the image-side surface 46 of the fourth lens 4 is concave, and its circumferential region 463 is concave. In this embodiment, both the object-side surface 45 and the image-side surface 46 of the fourth lens 4 are aspherical, but the invention is not limited thereto.

[0073] The fifth lens 5 has a positive refractive index. The optical axis region 551 of the object-side surface 55 of the fifth lens 5 is convex, and its circumferential region 553 is also convex. The optical axis region 561 of the image-side surface 56 of the fifth lens 5 is convex, and its circumferential region 563 is also convex. In this embodiment, both the object-side surface 55 and the image-side surface 56 of the fifth lens 5 are aspherical, but the invention is not limited thereto.

[0074] In this embodiment, the optical lens 10 has only the five lenses mentioned above.

[0075] Other detailed optical data for the first embodiment are as follows: Figure 8As shown, the effective focal length (EFL) of the optical lens 10 in the first embodiment is 0.682 mm, the half field of view (HFOV) is 56.983 degrees, the system length is 3.010 mm, the aperture value (F-number, Fno) is 2.000, and the image height is 0.692 mm. The effective focal length (EFL2t5) of the second lens 2 to the fifth lens 5 of the optical lens 10 is 0.627 mm. The system length refers to the distance from the object side surface 15 of the first lens 1 to the imaging surface 99 on the optical axis I. The material parameters of the lenses disclosed in the optical parameter table of the embodiment are in the international glass code format of nd refractive index and Vd Abbe number, so that those skilled in the art can understand the specific material implementation. Wherein, nd refractive index is the refractive index of the material at the d-helium yellow line of 587.56 nanometers, and Vd Abbe number is calculated based on the refractive index of the material at the d, F, and C wavelengths of the Fraunhofer spectrum.

[0076] The focal length values ​​disclosed in the optical parameter table of the embodiments are calculated based on the refractive index of the band in which the optical system is implemented. The primary wavelength of the embodiments of the present invention is 587 nanometers. Therefore, the focal length values ​​of the present invention are calculated based on the refractive index of the material at 587 nanometers.

[0077] Furthermore, in this embodiment, the object-side surfaces 25, 35, 45, 55 and the image-side surfaces 26, 36, 46, 56 of the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5, totaling eight surfaces, are aspherical. Among them, the object-side surfaces 25, 35, 45, 55 and the image-side surfaces 26, 36, 46, 56 are general even-order aspherical surfaces. These aspherical surfaces are defined according to the following formula (1):

[0078]

[0079] in:

[0080] Y: The perpendicular distance between a point on the aspherical curve and the optical axis I;

[0081] Z: Depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the optical axis I of the aspherical surface).

[0082] R: Radius of curvature of the lens surface near the optical axis I;

[0083] K: Conic coefficient;

[0084] ai : The i-th order aspherical coefficient.

[0085] The aspherical coefficients of the object surface 25 of the second lens 2 to the image surface 56 of the fifth lens 5 in formula (1) are as follows: Figure 9 As shown. Among them, Figure 9 The number 25 in the middle column indicates that it is the aspherical coefficient of the object side surface 25 of the second lens 2, and so on for the other columns.

[0086] Furthermore, the relationships between the important parameters in the optical lens 10 of the first embodiment are as follows: Figure 30 As shown.

[0087] in,

[0088] T1 is the thickness of the first lens 1 on the optical axis I;

[0089] T2 is the thickness of the second lens 2 on the optical axis I;

[0090] T3 is the thickness of the third lens 3 on the optical axis I;

[0091] T4 is the thickness of the fourth lens 4 on optical axis I;

[0092] T5 is the thickness of the fifth lens 5 on optical axis I;

[0093] TF is the thickness of filter 8 on optical axis I;

[0094] G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I;

[0095] G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I;

[0096] G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I;

[0097] G45 is the air gap between the fourth lens 4 and the fifth lens 5 on the optical axis I;

[0098] G5F is the air gap between the fifth lens 5 and the filter 8 on the optical axis I;

[0099] GFP is the air gap between filter 8 and imaging plane 99 on optical axis I;

[0100] AAG is the sum of the four air gaps on the optical axis I from the first lens 1 to the fifth lens 5, namely the sum of G12, G23, G34, and G45;

[0101] ALT is the sum of the thicknesses of the five lenses from the first lens 1 to the fifth lens 5 on the optical axis I, namely the sum of T1, T2, T3, T4, and T5;

[0102] TL is the distance on the optical axis I from the object side surface 15 of the first lens 1 to the image side surface 56 of the fifth lens 5.

[0103] TTL is the distance on the optical axis I from the object surface 15 to the imaging surface 99 of the first lens 1.

[0104] BFL is the distance on optical axis I from the image side 56 of the fifth lens 5 to the imaging plane 99, which is the sum of G5F, TF, and GFP.

[0105] D 11t 21 is the distance on the optical axis I from the object side surface 15 of the first lens 1 to the object side surface 25 of the second lens 2, which is the sum of T1 and G12;

[0106] D21 t 52 is the distance on the optical axis I from the object side 25 of the second lens 2 to the image side 56 of the fifth lens 5, that is, the sum of T2, G23, T3, G34, T4, G45, and T5;

[0107] AAG21 t 52 is the sum of the three air gaps on the optical axis I from the second lens 2 to the fifth lens 5, namely the sum of G23, G34, and G45;

[0108] Tmax is the maximum value of the thickness of the five lenses from the first lens 1 to the fifth lens 5 on the optical axis I, namely the maximum values ​​of T1, T2, T3, T4, and T5.

[0109] Tmin is the minimum thickness of the five lenses from the first lens 1 to the fifth lens 5 on the optical axis I, namely the minimum values ​​of T1, T2, T3, T4, and T5.

[0110] EFL is the effective focal length of optical lens 10;

[0111] EFL2t 5 is the effective focal length of the second lens 2 to the fifth lens 5 of the optical lens 10;

[0112] HFOV is half the field of view of optical lens 10;

[0113] ImgH is the image height of the optical lens 10;

[0114] Fno is the aperture value of the optical lens (10).

[0115] Furthermore, redefine:

[0116] f1 is the focal length of the first lens 1;

[0117] f2 is the focal length of the second lens 2;

[0118] f3 is the focal length of the third lens 3;

[0119] f4 is the focal length of the fourth lens 4;

[0120] f5 is the focal length of the fifth lens 5;

[0121] n1 is the nd refractive index of the first lens 1;

[0122] n2 is the nd refractive index of the second lens 2;

[0123] n3 is the nd refractive index of the third lens 3;

[0124] n4 is the nd refractive index of the fourth lens 4;

[0125] n5 is the nd refractive index of the fifth lens 5;

[0126] V1 is the Abbe number of the first lens 1, Vd;

[0127] V2 is the Abbe number of the second lens 2, Vd;

[0128] V3 is the Abbe number of the third lens 3;

[0129] V4 is the Abbe number of the fourth lens 4;

[0130] V5 is the Abbe number of the fifth lens 5.

[0131] See also Figures 7A to 7D , Figure 7A The diagram illustrates the longitudinal spherical aberration on the imaging plane 99 in the first embodiment when the wavelengths are 486 nm, 587 nm, and 656 nm. Figure 7B and Figure 7C The diagrams illustrate the field curvature aberrations in the sagittal and tangential directions on the imaging plane 99 of the first embodiment when the wavelengths are 486nm, 587nm, and 656nm. Figure 7D The diagram illustrates the distortion aberration on the imaging plane 99 in the first embodiment when the wavelengths are 486 nm, 587 nm, and 656 nm. The longitudinal spherical aberration of this first embodiment is shown below. Figure 7A As shown, 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 0.030 mm. 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.

[0132] exist Figure 7B and Figure 7C In the two field curvature aberration diagrams, the focal length variation for the three representative wavelengths falls within ±0.180 mm across the entire field of view, indicating that the optical system of this first embodiment can effectively eliminate aberrations. Figure 7D The distortion aberration diagram shows that the distortion aberration of this embodiment is maintained within the range of ±40.000%, indicating that the distortion aberration of this first embodiment meets the optical quality requirements of the optical system. Based on this, it can be shown that compared with existing optical lenses, this first embodiment can still provide good optical quality even when the system length has been shortened to 3.010 mm. Therefore, this first embodiment can provide lenses with smaller size and better optical quality for the second to fifth lenses while maintaining good optical performance.

[0133] Figure 10 This is a schematic diagram of an optical lens according to a second embodiment of the present invention. Figures 11A to 11D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the second embodiment. Please refer to [the diagram first]. Figure 10 A second embodiment of the optical 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, and 5 are more or less different. Furthermore, in this embodiment, the fourth lens 4 has a negative refractive index, and the circumferential region 453 of the object-side surface 45 of the fourth lens 4 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.

[0134] Detailed optical data of the optical lens 10 in the second embodiment are as follows: Figure 12 As shown, the optical lens 10 of the second embodiment has an effective focal length of 0.655 mm, a half angle of view of 56.778 degrees, a system length of 2.685 mm, an aperture of 2.000, an image height of 0.691 mm, and an effective focal length (EFL2t 5) of the second lens 2 to the fifth lens 5 of the optical lens 10 of 0.636 mm.

[0135] like Figure 13 As shown, Figure 13 Then, these are the aspherical coefficients of the object side 15 of the first lens 1 to the image side 56 of the fifth lens 5 in the above formula (1) of the second embodiment.

[0136] Furthermore, the relationships between the important parameters in the optical lens 10 of the second embodiment are as follows: Figure 30 As shown.

[0137] The longitudinal spherical aberration of this second embodiment is as follows: Figure 11AAs shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.090 mm. Figure 11B and Figure 11C In the two field curvature aberration diagrams, the focal length variation for the three representative wavelengths falls within ±0.140 mm across the entire field of view. Figure 11D The distortion aberration diagram shows that the distortion aberration in this embodiment is maintained within the range of ±40.000%.

[0138] As can be seen from the above description, the system length of the second embodiment is shorter than that of the first embodiment. Therefore, the second embodiment has a smaller volume compared to the first embodiment. Furthermore, the field curvature aberration of the second embodiment is smaller than that of the first embodiment, resulting in better optical quality.

[0139] Figure 14 This is a schematic diagram of an optical lens according to a third embodiment of the present invention. Figures 15A to 15D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the third embodiment. Please refer to [the diagram first]. Figure 14 A third embodiment of the optical 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, and 5 are more or less different. Furthermore, in this embodiment, the fourth lens 4 has a negative refractive index, and the circumferential region 563 of the image-side surface 56 of the fifth lens 5 is concave. It should be noted that, for clearer illustration, Figure 14 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0140] Detailed optical data of the optical lens 10 in the third embodiment are as follows: Figure 16 As shown, the optical lens 10 of the third embodiment has an effective focal length of 0.670 mm, a half angle of view of 56.340 degrees, a system length of 3.132 mm, an aperture of 2.000, an image height of 0.691 mm, and an effective focal length (EFL2t 5) of the second lens 2 to the fifth lens 5 of the optical lens 10 of 0.637 mm.

[0141] like Figure 17 As shown, Figure 17 Then, these are the aspherical coefficients of the object side 15 of the first lens 1 to the image side 56 of the fifth lens 5 in the above formula (1) of the third embodiment.

[0142] Furthermore, the relationships between the important parameters in the optical lens 10 of the third embodiment are as follows: Figure 30 As shown.

[0143] The longitudinal spherical aberration of this third embodiment is as follows: Figure 15AAs shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.050 mm. Figure 15B and Figure 15C In the two field curvature aberration diagrams, the focal length variation for the three representative wavelengths falls within ±0.080 mm across the entire field of view. Figure 15D The distortion aberration diagram shows that the distortion aberration in this embodiment is maintained within the range of ±35.000%.

[0144] As can be seen from the above description, the field curvature aberration of the third embodiment is smaller than that of the first embodiment, and the distortion aberration of the third embodiment is smaller than that of the first embodiment, thus exhibiting better optical quality.

[0145] Figure 18 This is a schematic diagram of an optical lens according to the fourth embodiment of the present invention. Figures 19A to 19D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the fourth embodiment. Please refer to [the diagram first]. Figure 18 A fourth embodiment of the optical 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, and 5 are more or less different. Furthermore, in this embodiment, the fourth lens 4 has a negative refractive index. 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.

[0146] Detailed optical data of the optical lens 10 in the fourth embodiment are as follows: Figure 20 As shown, the optical lens 10 of the fourth embodiment has an effective focal length of 0.661 mm, a half angle of view of 61.148 degrees, a system length of 2.748 mm, an aperture of 2.000, an image height of 0.691 mm, and the effective focal length (EFL2t 5) of the second lens 2 to the fifth lens 5 of the optical lens 10 is 0.661 mm.

[0147] like Figure 21 As shown, Figure 21 Then, these are the aspherical coefficients of the object side 15 of the first lens 1 to the image side 56 of the fifth lens 5 in the above formula (1).

[0148] Furthermore, the relationships between the important parameters in the optical lens 10 of the fourth embodiment are as follows: Figure 30 As shown.

[0149] The longitudinal spherical aberration of this fourth embodiment is as follows: Figure 19A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.035 mm. Figure 19B and Figure 19CIn the two field curvature aberration diagrams, the focal length variation for the three representative wavelengths falls within ±0.100 mm across the entire field of view. Figure 19D The distortion aberration diagram shows that the distortion aberration in this embodiment is maintained within the range of ±50.000%.

[0150] As can be seen from the above description, the system length of the fourth embodiment is shorter than that of the first embodiment. Therefore, the fourth embodiment has a smaller volume compared to the first embodiment. The half-angle of view of the fourth embodiment is larger than that of the first embodiment. Therefore, the fourth embodiment has a larger angle range for receiving images compared to the first embodiment. Furthermore, the field curvature aberration of the fourth embodiment is smaller than that of the first embodiment, resulting in better optical quality.

[0151] Figure 22 This is a schematic diagram of an optical lens according to the fifth embodiment of the present invention. Figures 23A to 23D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the fifth embodiment. Please refer to [the diagram first]. Figure 22 A fifth embodiment of the optical 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, and 5 are more or less different. Furthermore, the circumferential region 253 of the object-side surface 25 of the second lens 2 is concave, the optical axis region 551 of the object-side surface 55 of the fifth lens 5 is concave, and the circumferential region 563 of the image-side surface 56 of the fifth lens 5 is concave. It should be noted that, for clearer illustration, Figure 22 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0152] Detailed optical data of the optical lens 10 in the fifth embodiment are as follows: Figure 24 As shown, the optical lens 10 of the fifth embodiment has an effective focal length of 0.828 mm, a half angle of view of 61.150 degrees, a system length of 2.719 mm, an aperture of 2.000, an image height of 0.691 mm, and an effective focal length (EFL2t 5) of the second lens 2 to the fifth lens 5 of the optical lens 10 of 0.814 mm.

[0153] like Figure 25 As shown, Figure 25 Then, these are the aspherical coefficients of the object side 15 of the first lens 1 to the image side 56 of the fifth lens 5 in the above formula (1).

[0154] Furthermore, the relationships between the important parameters in the optical lens 10 of the fifth embodiment are as follows: Figure 30 As shown.

[0155] The longitudinal spherical aberration of this fifth embodiment is as follows: Figure 23AAs shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.070 mm. Figure 23B and Figure 23C In the two field curvature aberration diagrams, the focal length variation for the three representative wavelengths falls within ±0.070 micrometers across the entire field of view. Figure 23D The distortion aberration diagram shows that the distortion aberration in this embodiment is maintained within the range of ±60.000%.

[0156] As can be seen from the above description, the system length of the fifth embodiment is shorter than that of the first embodiment. Therefore, the fifth embodiment has a smaller volume compared to the first embodiment. The half-angle of view of the fifth embodiment is larger than that of the first embodiment. Therefore, the fifth embodiment has a larger angle range for receiving images compared to the first embodiment. Furthermore, the field curvature aberration of the fifth embodiment is smaller than that of the first embodiment, resulting in better optical quality.

[0157] Figure 26 This is a schematic diagram of an optical lens according to the sixth embodiment of the present invention. Figures 27A to 27D This is a diagram showing the longitudinal spherical aberration and various aberrations of the optical lens in the sixth embodiment. Please refer to [the diagram first]. Figure 26 A sixth embodiment of the optical 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, and 5 are more or less different. Furthermore, in this embodiment, the first lens 1 has a positive refractive index, and the fourth lens 4 has a negative refractive index. It should be noted that, for clear visualization of the figures, Figure 26 The labels for the optical axis region and the circumferential region that are similar in shape to the first embodiment are omitted.

[0158] Detailed optical data of the optical lens 10 in the sixth embodiment are as follows: Figure 28 As shown, the optical lens 10 of the sixth embodiment has an effective focal length of 0.672 mm, a half angle of view of 61.114 degrees, a system length of 2.540 mm, an aperture of 2.000, an image height of 0.691 mm, and an effective focal length (EFL2t 5) of the second lens 2 to the fifth lens 5 of the optical lens 10 of 0.618 mm.

[0159] like Figure 29 As shown, Figure 29 Then, these are the aspherical coefficients of the object side 15 of the first lens 1 to the image side 56 of the fifth lens 5 in the above formula (1) of the sixth embodiment.

[0160] Furthermore, the relationships between the important parameters in the optical lens 10 of the sixth embodiment are as follows: Figure 30 As shown.

[0161] The longitudinal spherical aberration of this sixth embodiment is as follows: Figure 27A As shown, the imaging point deviation of off-axis rays at different heights is controlled within ±0.050 mm. Figure 27B and Figure 27C In the two field curvature aberration diagrams, the focal length variation for the three representative wavelengths falls within ±0.080 mm across the entire field of view. Figure 27D The distortion aberration diagram shows that the distortion aberration in this embodiment is maintained within the range of ±50.000%.

[0162] As can be seen from the above description, the system length of the sixth embodiment is shorter than that of the first embodiment. Therefore, the sixth embodiment has a smaller volume compared to the first embodiment. The half-angle of view of the sixth embodiment is larger than that of the first embodiment. Therefore, the sixth embodiment has a larger angle range for receiving images compared to the first embodiment. Furthermore, the field curvature aberration of the sixth embodiment is smaller than that of the first embodiment, resulting in better optical quality.

[0163] In summary, and with reference to... Figure 30 , Figure 30 This is a tabular diagram showing the relationship between the various optical parameters of the first to sixth embodiments described above. The optical lens 10 of the embodiments of the present invention can achieve the following effects and advantages:

[0164] I. The optical lens 10 of the present invention satisfies the condition: D 11t 21 / AAG21 t 52 ≥ 1.550, thus providing sufficient space to accommodate various structural variations and maintaining the relatively small size of the second lens 2 to the fifth lens 5. Furthermore, when the second lens 2 has a negative refractive index, the circumferential region 363 of the image-side surface 36 of the third lens 3 is convex, and the fifth lens 5 has a positive refractive index, and the optical axis region 561 of the image-side surface 56 of the fifth lens 5 is convex, it can converge light rays from different angles, correct aberrations in the central field of view of the imaging plane, and maintain optical quality. In a preferred embodiment, the preferred range of the above condition is: 3.500 ≥ D 11t 21 / AAG21 t 52 ≥ 1.550. Additionally, when the third lens 3 further satisfies the requirement of having a positive refractive index, the assembly yield and optical quality can be improved.

[0165] II. The optical lens 10 of the present invention satisfies the condition: D 11t 21 / AAG21 t 52 ≥ 1.550, thus providing sufficient space to accommodate various structural variations and maintaining the relatively small size of the second lens 2 to the fifth lens 5. Furthermore, when the optical axis region 261 of the image-side surface 26 of the second lens 2 is concave and the optical axis region 361 of the image-side surface 36 of the third lens 3 is convex, and the fifth lens 5 has a positive refractive index, it can converge light rays from different angles, correct aberrations in the central field of view of the imaging plane, and maintain optical quality. In a preferred embodiment, the preferred range of the above condition is: 3.500 ≥ D11 t 21 / AAG21 t 52 ≥ 1.550. Additionally, when the second lens 2 further satisfies a negative refractive index and the third lens 3 has a positive refractive index, the assembly yield and optical quality can be improved.

[0166] Third, the optical lens 10 of the present invention satisfies the condition: D 11t 21 / AAG21 t 52≧1.550, thus providing sufficient space to accommodate various structural variations while maintaining the relatively small size of the second lens 2 to the fifth lens 5. Furthermore, when the optical axis region 261 of the image-side surface 26 of the second lens 2 is concave, the circumferential region 361 of the image-side surface 36 of the third lens 3 is convex, and the fifth lens 5 has a positive refractive index, it can converge light rays from different angles, correcting aberrations in the central field of view of the imaging plane and maintaining optical quality. Moreover, when the condition: |f1 / EFL2t5|≧36.500 is satisfied, the optimal ratio of the focal length of the first lens 1 to the focal lengths of the second lens 2 to the fifth lens 5 can correct distortions in the peripheral field of view to maintain better optical quality while keeping the overall size relatively small. In a preferred embodiment, the preferred range of the above conditional expressions is: 3.500 ≥ D11 t21 / AAG21t 52 ≥ 1.550 and 450.000 ≥ |f1 / EFL2t5| ≥ 36.500. Furthermore, when the third lens 3 is further satisfied to have a positive refractive index, the assembly yield and optical quality can be improved.

[0167] IV. When the lens material meets the following configuration relationship, it is beneficial to the transmission and refraction of light, and at the same time effectively improves chromatic aberration, so that the optical lens has excellent optical quality.

[0168] in,

[0169] The optical lens 10 conforms to (V3+V5) / V1≧3.000, with a preferred range of 4.000≧(V3+V5) / V1≧3.000;

[0170] The optical lens 10 conforms to V1+V2+V3≧135.000, with a preferred range of 150.000≧V1+V2+V3≧135.000; and

[0171] The optical lens 10 conforms to V1+V4-V2≦0.

[0172] V. In order to shorten the length of the lens system and ensure optical quality, while taking into account the ease of manufacturing, the air gap between the lenses is reduced or the lens thickness is appropriately shortened. If the numerical limits of the following conditional formula are met, the embodiments of the present invention can have a better configuration.

[0173] in,

[0174] The optical lens 10 conforms to D11 t 21 / AAG21 t52≧1.550, with a preferred range of 3.500≧D11 t21 / AAG21 t 52≧1.550;

[0175] The optical lens 10 conforms to ALT / EFL ≥ 1.600, with a preferred range of 3.000 ≥ ALT / EFL ≥ 1.600;

[0176] The optical lens 10 conforms to TL / EFL ≥ 2.000, with a preferred range of 4.000 ≥ TL / EFL ≥ 2.000;

[0177] The optical lens 10 conforms to AAG / ImgH≧0.500, with a preferred range of 1.500≧AAG / ImgH≧0.500;

[0178] The optical lens 10 conforms to BFL / ImgH≧0.700, with a preferred range of 1.500≧BFL / ImgH≧0.700;

[0179] The optical lens 10 conforms to TTL / (AAG*Fno)≧1.500, with a preferred range of 3.500≧TTL / (AAG*Fno)≧1.500;

[0180] The optical lens 10 conforms to (T3+T4+T5) / ImgH≧0.900, with a preferred range of 1.500≧(T3+T4+T5) / ImgH≧0.900;

[0181] The optical lens 10 conforms to ALT / (G34+T2)≧3.800, with a better range of 11.000≧ALT / (G34+T2)≧3.800;

[0182] The optical lens 10 conforms to (D11t21+T3+T5) / D21t52 ≥ 0.700, with a preferred range of 1.500 ≥ (D11t21+T3+T5) / D21t52 ≥ 0.700; and

[0183] The optical lens 10 conforms to D11 t 21 / AAG≧0.800, with a preferred range of 2.500≧D11 t21 / AAG≧0.800.

[0184] VI. In order to achieve a wider angle of view, better focal length and ensure optical quality, and taking into account the ease of manufacturing, the air gap between lenses or the lens thickness can be adjusted. If the numerical limits of the following conditional formula are met, the embodiments of the present invention can have a better configuration.

[0185] in,

[0186] The optical lens 10 conforms to |f1 / EFL2t5|≧36.500, with a preferred range of 450.000≧|f1 / EFL2t5|≧36.500;

[0187] The optical lens 10 conforms to HFOV*EFL / (G34+Tmin)≧205.000, with a preferred range of 300.000≧HFOV*EFL / (G34+Tmin)≧205.000;

[0188] The optical lens 10 conforms to HFOV*ImgH / AAG≧40.000, with a preferred range of 90.000≧HFOV*ImgH / AAG≧40.000;

[0189] The optical lens 10 conforms to HFOV*Tmax / BFL≧30.000, with a preferred range of 65.000≧HFOV*Tmax / BFL≧30.000;

[0190] The optical lens 10 conforms to |f1 / BFL|≧25.000, with a preferred range of 370.000≧|f1 / BFL|≧25.000;

[0191] The optical lens 10 conforms to |BFL / EFL²t⁵|≧0.500, with a preferred range of 1.500≧|BFL / EFL²t⁵|≧0.500; and

[0192] The optical lens 10 conforms to |(T1+T3+T5) / EFL2t5|≧1.000, with a preferred range of 2.500≧|(T1+T3+T5) / EFL2t5|≧1.000.

[0193] Furthermore, 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. Given the unpredictability of optical system design, under the architecture of the present invention, meeting the above-mentioned conditions can better shorten the system length, reduce the aperture value, improve optical quality, or increase assembly yield, thus overcoming the shortcomings of prior art. Moreover, the use of plastic material for the lenses in the embodiments of the present invention further reduces lens weight and saves costs.

[0194] The numerical ranges, including the maximum and minimum values, obtained from the combined proportional relationships of the optical parameters disclosed in the various embodiments of the present invention can all be implemented accordingly.

[0195] 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:

[0196] (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.

[0197] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0198] (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.

[0199] 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.

[0200] 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 lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the first lens to the fifth lens comprises an object side surface facing the object side and passing an imaging light ray and an image side surface facing the image side and passing the imaging light ray; the second lens has a negative refractive power; the third lens has a positive refractive power, and a circumferential region of the image side surface of the third lens is convex; the fifth lens has a positive refractive power, and an optical axis region of the image side surface of the fifth lens is convex; wherein lenses of the optical lens are only the above five lenses, and the following conditional expression is satisfied: D11t21 / AAG21t52≧1.550, wherein D11t21 is a distance on the optical axis from the object side surface of the first lens to the object side surface of the second lens, and AAG21t52 is a sum of three air gaps on the optical axis from the second lens to the fifth lens.

2. An optical lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the first lens to the fifth lens comprises an object side surface facing the object side and passing an imaging light ray and an image side surface facing the image side and passing the imaging light ray; the second lens has a negative refractive power, and an optical axis region of the image side surface of the second lens is concave; the third lens has a positive refractive power, and an optical axis region of the image side surface of the third lens is convex; the fifth lens has a positive refractive power; wherein lenses of the optical lens are only the above five lenses, and the following conditional expression is satisfied: D11t21 / AAG21t52≧1.550, wherein D11t21 is a distance on the optical axis from the object side surface of the first lens to the object side surface of the second lens, and AAG21t52 is a sum of three air gaps on the optical axis from the second lens to the fifth lens.

3. An optical lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the first lens to the fifth lens comprises an object side surface facing the object side and passing an imaging light ray and an image side surface facing the image side and passing the imaging light ray; the second lens has a negative refractive power; the third lens has a positive refractive power; the fifth lens has a positive refractive power; wherein lenses of the optical lens are only the above five lenses, and the following conditional expressions are satisfied: D11t21 / AAG21t52≧1.550 and |f1 / EFL2t5|≧36.500, wherein D11t21 is a distance on the optical axis from the object side surface of the first lens to the object side surface of the second lens, AAG21t52 is a sum of three air gaps on the optical axis from the second lens to the fifth lens, f1 is a focal length of the first lens, and EFL2t5 is an effective focal length of the second lens to the fifth lens of the optical lens.

4. The optical lens of claim 1 or 2, wherein the optical lens further satisfies the following conditional expression: |fl / BFL| ≧ 25.000, wherein fl is the focal length of the first lens, and BFL is the distance from the image side surface of the fifth lens to an image plane on the optical axis.

5. The optical lens of claim 1 or 2, wherein the optical lens further satisfies the following conditional expression: |BFL / EFL2t5| ≧ 0.500, wherein BFL is the distance from the image side surface of the fifth lens to an image plane on the optical axis, and EFL2t5 is the effective focal length of the second lens to the fifth lens of the optical lens.

6. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: VI + V4 - V2 ≦ 0.000, wherein VI is the Vd Abbe number of the first lens, V4 is the Vd Abbe number of the fourth lens, and V2 is the Vd Abbe number of the second lens.

7. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: (V3 + V5) / VI ≧ 3.000, wherein V3 is the Vd Abbe number of the third lens, V5 is the Vd Abbe number of the fifth lens, and VI is the Vd Abbe number of the first lens.

8. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: VI + V2 + V3 ≧ 135.000, wherein VI is the Vd Abbe number of the first lens, V2 is the Vd Abbe number of the second lens, and V3 is the Vd Abbe number of the third lens.

9. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: ALT / EFL ≧ 1.600, wherein ALT is the sum of the five lens thicknesses of the first lens to the fifth lens on the optical axis, and EFL is the effective focal length of the optical lens.

10. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: TL / EFL ≧ 2.000, wherein TL is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and EFL is the effective focal length of the optical lens.

11. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: AAG / ImgH ≧ 0.500, wherein AAG is the sum of the four air gaps of the first lens to the fifth lens on the optical axis, and ImgH is the image height of the optical lens.

12. The optical lens of any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: BFL / ImgH ≧ 0.700, wherein BFL is the distance from the image side surface of the fifth lens to an image plane on the optical axis, and ImgH is the image height of the optical lens.

13. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: TTL / (AAG*Fno)≧1.500, where TTL is a distance on the optical axis from the object side of the first lens to an image plane, AAG is a sum of four air gaps on the optical axis from the first lens to the fifth lens, and Fno is an F number of the optical lens.

14. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: (T3+T4+T5) / ImgH≧0.900, where T3 is a thickness on the optical axis of the third lens, T4 is a thickness on the optical axis of the fourth lens, T5 is a thickness on the optical axis of the fifth lens, and ImgH is an image height of the optical lens.

15. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: ALT / (G34+T2)≧3.800, where ALT is a sum of five lens thicknesses on the optical axis from the first lens to the fifth lens, G34 is an air gap on the optical axis of the third lens and the fourth lens, and T2 is a thickness on the optical axis of the second lens.

16. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: (D 11t 21+T3+T5) / D21 t 52≧0.700, where T3 is a thickness on the optical axis of the third lens, T5 is a thickness on the optical axis of the fifth lens, and D21 t 52 is a distance on the optical axis from the object side of the second lens to the image side of the fifth lens.

17. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: D11t 21 / AAG≧0.800, where AAG is a sum of four air gaps on the optical axis from the first lens to the fifth lens.

18. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: HFOV*EFL / (G34+Tmin)≧205.000, where HFOV is a half view angle of the optical lens, EFL is an effective focal length of the optical lens, G34 is an air gap on the optical axis of the third lens and the fourth lens, and Tmin is a minimum value of five lens thicknesses on the optical axis from the first lens to the fifth lens.

19. The optical lens of any of claims 1-3, wherein the optical lens further satisfies the following conditional expression: HFOV*ImgH / AAG≧40.000, where HFOV is a half view angle of the optical lens, ImgH is an image height of the optical lens, and AAG is a sum of four air gaps on the optical axis from the first lens to the fifth lens.

20. The optical lens according to any one of claims 1-3, wherein the optical lens further satisfies the following conditional expression: HFOV*Tmax / BFL > 30.000, wherein HFOV is a half field of view of the optical lens, Tmax is a maximum value of five lens thicknesses of the first lens to the fifth lens on the optical axis, and BFL is a distance from the image side surface of the fifth lens to an imaging surface on the optical axis.

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