Optical imaging lens

Abstract

An optical imaging lens includes a first lens element, a second lens, a third lens element and a fourth lens element from an object side to an image side in order along an optical axis. An optical axis region of the image -side surface of the first lens element is convex, the second lens element has positive refracting power, a periphery region of the object-side surface of the third lens element is convex and a periphery region of the object-side surface of the fourth lens element is concave. The lens elements included by the optical imaging lens are only the four lens elements described above to satisfy: (EFL+TTL) / D22t32≥33.000.

Description

Technical Field

[0001] This invention generally relates to an optical imaging lens. Specifically, this invention is particularly directed to an optical imaging lens primarily used for capturing images and recording videos, and applicable to portable electronic products, such as mobile phones, cameras, tablet computers, personal digital assistants (PDAs), and other electronic devices. Prior Technology

[0002] The specifications of portable electronic products are changing rapidly, and their key components—optical imaging lenses—are also becoming more diversified. Their applications are no longer limited to shooting images and videos, but also include the need for telephoto lenses.

[0003] Increasing the focal length of an optical imaging lens also increases the system length, leading to increased inter-lens distances and reduced assembly reliability and manufacturing yield. Therefore, how to increase the system focal length of an optical imaging lens while maintaining image quality and improving assembly reliability and manufacturing yield is a topic that requires in-depth exploration. Summary of the Invention

[0004] Therefore, various embodiments of the present invention provide a four-element optical imaging lens with a long focal length, excellent telephoto capability, good optical performance, and technical feasibility. The four-element optical imaging lens of the present invention comprises a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object side to the image side. Each of the first, second, third, and fourth lenses in the four-element optical imaging lens of the present invention 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.

[0005] In one embodiment of the present invention, the optical axis region of the image-side surface of the first lens is convex, the second lens has positive refractive index, the circumferential region of the object-side surface of the third lens is convex, and the circumferential region of the object-side surface of the fourth lens is concave. This optical imaging lens has only the above four lenses and satisfies the following condition: (EFL+TTL) / D22t32≧33.000.

[0006] In another embodiment of the present invention, the optical axis region of the image-side surface of the first lens is convex, the second lens has positive refractive index, the circumferential region of the object-side surface of the third lens is convex, and the circumferential region of the object-side surface of the fourth lens is concave. The optical imaging lens has only the above four lenses and satisfies the following condition: (EFL+BFL) / (T1+T2)≧7.900.

[0007] In another embodiment of the present invention, the optical axis region of the image-side surface of the first lens is convex, the second lens has positive refractive index, the circumferential region of the object-side surface of the third lens is convex, and the circumferential region of the object-side surface of the fourth lens is concave. The optical imaging lens has only the above four lenses and satisfies the following condition: (EFL+T1) / (ALT+G23+G34)≧2.500.

[0008] In the optical imaging lens of the present invention, embodiments may further selectively satisfy the following conditions:

[0009] Fno*ALT / G12≧95.000;

[0010] (TL+G34) / (G23+T4)≧7.500;

[0011] (ALT+D32t42) / G12≧40.000;

[0012] (TTL+T4) / HFOV≧1.270;

[0013] ImgH / D22t32≧3.000;

[0014] ImgH*T2 / G12 ≥ 16.000;

[0015] (BFL+T2+T3) / (D11t21)≧10.000;

[0016] (EFL+T4) / D11t21≧11.300;

[0017] |υ1-υ2|*υ3≦350.000;

[0018] υ3+υ4≦55.000;

[0019] (υ1*υ2) / υ4≧120,000;

[0020] u2*u3 / u4≧50,000;

[0021] (EFL+D12t22)*ImgH≧45,000;

[0022] HFOV / Fno*(G12+T3)≦2,700;

[0023] u1 / (u2-2*u3)≧8,500;

[0024] u3*u4 / u1<12,000;

[0025] Fno / (G12+T4)≧4.500.

[0026] Wherein, T1 is defined as the thickness of the first lens on the optical axis; T2 is defined as the thickness of the second lens on the optical axis; T3 is defined as the thickness of the third lens on the optical axis; T4 is defined as the thickness of the fourth lens on the optical axis; G12 is defined as the air gap between the first and second lenses on the optical axis; G23 is defined as the air gap between the second and third lenses on the optical axis; G34 is defined as the air gap between the third and fourth lenses on the optical axis; AAG is defined as the sum of the three air gaps on the optical axis from the first to the fourth lens, i.e., the sum of G12, G23, and G34; ALT is defined as the sum of the four lens thicknesses on the optical axis from the first to the fourth lens, i.e., the sum of T1, T2, T3, and T4; D11t21 is defined as the distance on the optical axis from the object side of the first lens to the object side of the second lens, i.e., the sum of T1 and G12; D12t22 The distances along the optical axis from the image-side surface of the first lens to the image-side surface of the second lens are defined as: G12 and T2; D22t32 is defined as the distance along the optical axis from the image-side surface of the second lens to the image-side surface of the third lens, which is defined as the sum of G23 and T3; D32t42 is defined as the distance along the optical axis from the image-side surface of the third lens to the image-side surface of the fourth lens, which is defined as the sum of G34 and T4; TL is defined as the distance along the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens; TTL is defined as the distance along the optical axis from the object-side surface of the first lens to the imaging plane, which is the system length of the optical imaging lens; BFL is defined as the distance along the optical axis from the image-side surface of the fourth lens to the imaging plane; EFL is defined as the effective focal length of the optical imaging lens; HFOV is defined as the half-angle of view of the optical imaging lens; ImgH is defined as the image height of the optical imaging lens; and Fno is defined as the aperture value of the optical imaging lens.

[0027] In addition, υ1 is defined as the Vd Abbe number of the first lens; υ2 is defined as the Vd Abbe number of the second lens; υ3 is defined as the Vd Abbe number of the third lens; and υ4 is defined as the Vd Abbe number of the fourth lens. Simple Explanation of the Diagram

[0028] Figures 1 to 5 illustrate schematic diagrams of the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 6A illustrates a schematic diagram of the actual optical path of a first embodiment of the optical imaging lens of the present invention. Figure 6B illustrates a schematic diagram of a simulated optical path of a first embodiment of the optical imaging lens of the present invention. Figure 7A illustrates the longitudinal spherical aberration on the imaging plane in the first embodiment. Figure 7B illustrates the field curvature aberration in the sagittal direction of the first embodiment. Figure 7C illustrates the field curvature aberration in the meridional direction of the first embodiment. Figure 7D illustrates the distortion aberrations of the first embodiment. Figure 8 illustrates a schematic diagram of a second embodiment of the optical imaging lens of the present invention. Figure 9A illustrates the longitudinal spherical aberration on the imaging plane in the second embodiment. Figure 9B illustrates the field curvature aberration in the sagittal direction of the second embodiment. Figure 9C illustrates the field curvature aberration in the meridional direction of the second embodiment. Figure 9D illustrates the distortion aberrations of the second embodiment. Figure 10 illustrates a schematic diagram of a third embodiment of the optical imaging lens of the present invention. Figure 11A illustrates the longitudinal spherical aberration on the imaging plane in the third embodiment. Figure 11B illustrates the field curvature aberration in the sagittal direction of the third embodiment. Figure 11C illustrates the field curvature aberration in the meridional direction of the third embodiment. Figure 11D illustrates the distortion aberrations of the third embodiment. Figure 12 illustrates a schematic diagram of a fourth embodiment of the optical imaging lens of the present invention. Figure 13A illustrates the longitudinal spherical aberration on the imaging plane in the fourth embodiment. Figure 13B illustrates the field curvature aberration in the sagittal direction of the fourth embodiment. Figure 13C illustrates the field curvature aberration in the meridional direction of the fourth embodiment. Figure 13D illustrates the distortion aberrations of the fourth embodiment. Figure 14 illustrates a fifth embodiment of the optical imaging lens of the present invention. Figure 15A illustrates the longitudinal spherical aberration on the imaging plane in the fifth embodiment. Figure 15B illustrates the field curvature aberration in the sagittal direction of the fifth embodiment. Figure 15C illustrates the field curvature aberration in the meridional direction of the fifth embodiment. Figure 15D illustrates the distortion aberrations of the fifth embodiment. Figure 16 illustrates a schematic diagram of a sixth embodiment of the optical imaging lens of the present invention. Figure 17A illustrates the longitudinal spherical aberration on the imaging plane in the sixth embodiment. Figure 17B illustrates the field curvature aberration in the sagittal direction of the sixth embodiment. Figure 17C illustrates the field curvature aberration in the meridional direction of the sixth embodiment. Figure 17D illustrates the distortion aberrations of the sixth embodiment. Figure 18 illustrates a schematic diagram of a seventh embodiment of the optical imaging lens of the present invention. Figure 19A illustrates the longitudinal spherical aberration on the imaging plane in the seventh embodiment. Figure 19B illustrates the field curvature aberration in the sagittal direction of the seventh embodiment. Figure 19C illustrates the field curvature aberration in the meridional direction of the seventh embodiment. Figure 19D illustrates the distortion aberrations of the seventh embodiment. Figure 20 illustrates a schematic diagram of an eighth embodiment of the optical imaging lens of the present invention. Figure 21A illustrates the longitudinal spherical aberration on the imaging plane in the eighth embodiment. Figure 21B illustrates the field curvature aberration in the sagittal direction of the eighth embodiment. Figure 21C illustrates the field curvature aberration in the meridional direction of the eighth embodiment. Figure 21D illustrates the distortion aberrations of the eighth embodiment. Figure 22 illustrates a schematic diagram of a ninth embodiment of the optical imaging lens of the present invention. Figure 23A illustrates the longitudinal spherical aberration on the imaging plane in the ninth embodiment. Figure 23B illustrates the field curvature aberration in the sagittal direction of the ninth embodiment. Figure 23C illustrates the field curvature aberration in the meridional direction of the ninth embodiment. Figure 23D illustrates the distortion aberrations of the ninth embodiment. Figure 24 illustrates a schematic diagram of a tenth embodiment of the optical imaging lens of the present invention. Figure 25A illustrates the longitudinal spherical aberration on the imaging plane in the tenth embodiment. Figure 25B illustrates the field curvature aberration in the sagittal direction of the tenth embodiment. Figure 25C illustrates the field curvature aberration in the meridional direction of the tenth embodiment. Figure 25D illustrates the distortion aberrations of the tenth embodiment. Figure 26 illustrates a schematic diagram of the eleventh embodiment of the optical imaging lens of the present invention. Figure 27A illustrates the longitudinal spherical aberration on the imaging plane in the eleventh embodiment. Figure 27B illustrates the field curvature aberration in the sagittal direction of the eleventh embodiment. Figure 27C illustrates the field curvature aberration in the meridional direction of the eleventh embodiment. Figure 27D illustrates the distortion aberrations of the eleventh embodiment. Figure 28 illustrates a schematic diagram of the twelfth embodiment of the optical imaging lens of the present invention. Figure 29A illustrates the longitudinal spherical aberration on the imaging plane in the twelfth embodiment. Figure 29B illustrates the field curvature aberration in the sagittal direction of the twelfth embodiment. Figure 29C illustrates the field curvature aberration in the meridional direction of the twelfth embodiment. Figure 29D illustrates the distortion aberrations of the twelfth embodiment. Figure 30 shows detailed optical data for the first embodiment. Figure 31 shows detailed aspherical data for the first embodiment. Figure 32 shows detailed optical data for the second embodiment. Figure 33 shows the detailed aspherical data of the second embodiment. Figure 34 shows detailed optical data for the third embodiment. Figure 35 shows detailed aspherical data for the third embodiment. Figure 36 shows detailed optical data for the fourth embodiment. Figure 37 shows the detailed aspherical data for the fourth embodiment. Figure 38 shows detailed optical data for the fifth embodiment. Figure 39 shows the detailed aspherical data for the fifth embodiment. Figure 40 shows detailed optical data for the sixth embodiment. Figure 41 shows the detailed aspherical data of the sixth embodiment. Figure 42 shows detailed optical data for the seventh embodiment. Figure 43 shows the detailed aspherical data of the seventh embodiment. Figure 44 shows detailed optical data for the eighth embodiment. Figure 45 shows the detailed aspherical data for the eighth embodiment. Figure 46 shows detailed optical data for the ninth embodiment. Figure 47 shows the detailed aspherical data for the ninth embodiment. Figure 48 shows detailed optical data for the tenth embodiment. Figure 49 shows the detailed aspherical data for the tenth embodiment. Figure 50 shows detailed optical data for the eleventh embodiment. Figure 51 shows the detailed aspherical data for the eleventh embodiment. Figure 52 shows the detailed optical data for the twelfth embodiment. Figure 53 shows the detailed aspherical data for the twelfth embodiment. Figures 54 and 55 show the key parameters of each embodiment. Implementation

[0029] 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.

[0030] 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-angle of view (HFOV) relative to the optical axis. The imaging rays are imaged on an imaging plane by the optical system. The statement "a lens has a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens, calculated using Gaussian optics theory, is positive (or negative). The statement "object-side (or image-side) of the lens" is defined as the specific range through which the imaging rays pass on the lens surface. The imaging rays include at least two types of rays: the chief ray (Lc) and the marginal ray (Lm) (as shown in Figure 1). The object-side (or image-side) of the lens can be divided into different regions depending on its location, including the optical axis region, the circumferential region, or one or more relay regions in some embodiments, which will be described in detail below.

[0031] Figure 1 is a radial sectional view of lens 100. Two reference points are defined on the surface of lens 100: a center point and a transition point. The center point of the lens surface is an intersection of the surface with the optical axis I. As illustrated in Figure 1, the first center point CP1 is located on the object-side surface 110 of lens 100, and the second center point CP2 is located on the image-side surface 120 of lens 100. A transition point is a point on the lens surface whose tangent is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the outermost radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, 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 Figure 4), and the Nth transition point (farthest from the optical axis I).

[0032] When the lens surface has at least one transition point, the area from the center point to the first transition point TP1 is defined as the optical axis region, which includes the center point. The area 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 does not have a transition point, 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.

[0033] 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.

[0034] In addition, referring to Figure 1, lens 100 may also include an assembly portion 130 extending radially outward from optical boundary OB. Assembly portion 130 is generally used for assembling lens 100 to a corresponding element (not shown) in an optical system. Imaging rays do not reach assembly portion 130. The structure and shape of assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. Assembly portion 130 of the lens discussed below may be partially or entirely omitted in the figures.

[0035] Referring to Figure 2, the region between the center point CP and the first conversion point TP1 is defined as the optical axis region Z1. The region between the first conversion point TP1 and the optical boundary OB of the lens surface is defined as the circumferential region Z2. As shown in Figure 2, after passing through the optical axis region Z1, the parallel ray 211 intersects the optical axis I on the image side A2 of the lens 200, meaning the focal point of the parallel ray 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the ray intersects the optical axis I on the image side A2 of the lens 200, the optical axis region Z1 is convex. Conversely, the parallel ray 212 diverges after passing through the circumferential region Z2. As shown in Figure 2, the extension line EL of the parallel ray 212 after passing through the circumferential region Z2 intersects the optical axis I on the object side A1 of the lens 200, meaning the focal point of the parallel ray 212 passing through the circumferential region Z2 is located at point M on the object side A1 of the lens 200. Since the extension line EL of the light ray intersects the optical axis I at the object side A1 of the lens 200, the circumferential region Z2 is concave. In the lens 200 shown in Figure 2, the first conversion point TP1 is the boundary between the optical axis region and the circumferential region, that is, the first conversion point TP1 is the boundary point between the convex surface and the concave surface.

[0036] 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.

[0037] Figures 3 to 5 provide examples of determining the surface shape and region boundaries of the lens region in various situations, including the aforementioned optical axis region, circumferential region, and relay region.

[0038] Figure 3 is a radial sectional view of lens 300. Referring to Figure 3, the image-side surface 320 of lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis region Z1 and the circumferential region Z2 of the image-side surface 320 of lens 300 are shown in Figure 3. The R value of this image-side surface 320 is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0039] Generally, the surface shape of each region bounded by the transition point will be opposite to that of the adjacent region. Therefore, the transition point can be used to define the change in surface shape, that is, from the transition point, the surface changes from concave to convex or from convex to concave. In Figure 3, since the optical axis region Z1 is concave, and the surface shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0040] Figure 4 is a radial sectional view of lens 400. Referring to Figure 4, the object-side surface 410 of lens 400 has a first conversion point TP1 and a second conversion point TP2. The area between the optical axis I and the first conversion point TP1 is defined as the optical axis region Z1 of the object-side surface 410. The R value of this object-side surface 410 is positive (i.e., R>0), therefore, the optical axis region Z1 is a convex surface.

[0041] The area between the second conversion point TP2 and the optical boundary OB of the object side surface 410 of the lens 400 is defined as a circular region Z2, which is also a convex surface. In addition, the area between the first conversion point TP1 and the second conversion point TP2 is defined as a relay region Z3, which is also a concave surface. Referring again to Figure 4, the object side surface 410, radially outward from the optical axis I, sequentially includes the optical axis region Z1 between the optical axis I and the first conversion point TP1, the relay region Z3 between the first conversion point TP1 and the second conversion point TP2, and the circular region Z2 between the second conversion point TP2 and the optical boundary OB of the object side surface 410 of the lens 400. Since the optical axis region Z1 is convex, and its surface shape changes from the first conversion point TP1 to concave, the relay region Z3 is concave. Furthermore, its surface shape changes back to convex from the second conversion point TP2, so the circular region Z2 is convex.

[0042] Figure 5 is a radial sectional view of lens 500. The object-side surface 510 of lens 500 has no transition point. For a lens surface without a transition point, such as the object-side surface 510 of lens 500, the optical axis region is defined as 0% 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. Referring to the lens 500 shown in Figure 5, the optical axis region Z1 of the object-side surface 510 is defined as 50% of the distance from the optical axis I to the optical boundary OB of the lens surface. The R value of this object-side surface 510 is positive (i.e., R > 0), therefore, the optical axis region Z1 is convex. Since the object-side surface 510 of lens 500 has no transition point, the circumferential region Z2 of the object-side surface 510 is also convex. Lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0043] As shown in Figure 6A, the optical imaging lens 1 of the present invention, from the object side A1 where the object (not shown) is placed to the image side A2 where the image is formed, along the optical axis I, is mainly composed of four lenses, which sequentially include an aperture 2, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, and an image plane 4. Generally speaking, the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 can all be made of transparent plastic material, but the present invention is not limited to this. Each lens has an appropriate refractive index. In the optical imaging lens 1 of the present invention, there are only four lenses with refractive indices: the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40. The optical axis I is the optical axis of the entire optical imaging lens 1, so the optical axis of each lens is the same as the optical axis of the optical imaging lens 1.

[0044] Furthermore, the optical imaging lens 1 also includes an aperture stop 80, which is positioned appropriately. In Figure 6A, the aperture stop 2 is located on the side of the first lens 10 facing the object side A1, that is, between the object side A1 and the first lens 10. When light emitted from the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of the present invention, it will sequentially pass through the aperture stop 2, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, and the filter 3, and then be focused on the imaging surface 4 on the image side A2 to form a clear image.

[0045] To meet the requirements of thinness, an optical bending element 5 is provided between the fourth lens 40 and the filter 3 or imaging surface 4. The optical axis I is bent by the optical bending element 5 into a first optical axis I1 and a second optical axis I2 that does not coincide with the first optical axis. The optical bending element can be a prism, a mirror, or other suitable reflective element. It should be noted that the actual optical path is shown in Figure 6A, not Figure 6B. However, in optical simulation, it is simpler to simulate / calculate using the optical path shown in Figure 6B, and the results of simulation / calculation using the optical path shown in Figure 6B are consistent with the results of simulation / calculation using the optical path shown in Figure 6A.

[0046] In various embodiments of the present invention, the filter 3 is disposed between the optical transition element 5 and the imaging surface 4. It can be a filter with various suitable functions, such as an infrared cut-off filter, which is used to prevent infrared rays in the imaging light from being transmitted to the imaging surface 4 and affecting the imaging quality.

[0047] Each lens in the optical imaging lens 1 of the present invention has an object-side surface facing the object side A1 and through which imaging light passes, and an image-side surface facing the image side A2 and through which imaging light passes. Furthermore, each lens in the optical imaging lens 1 of the present invention also has an optical axis region and a circumferential region. For example, the first lens 10 has an object-side surface 11 and an image-side surface 12; the second lens 20 has an object-side surface 21 and an image-side surface 22; the third lens 30 has an object-side surface 31 and an image-side surface 32; and the fourth lens 40 has an object-side surface 41 and an image-side surface 42. Each object-side surface and image-side surface also has an optical axis region and a circumferential region.

[0048] Each lens in the optical imaging lens 1 of the present invention also has a thickness T located on the optical axis I. For example, the first lens 10 has a first lens thickness T1, the second lens 20 has a second lens thickness T2, the third lens 30 has a third lens thickness T3, and the fourth lens 40 has a fourth lens thickness T4. Therefore, the sum of the thicknesses of all lenses in the optical imaging lens 1 of the present invention along the optical axis I is called ALT. That is, ALT = T1 + T2 + T3 + T4.

[0049] Furthermore, in the optical imaging lens 1 of this invention, there are air gaps located on the optical axis I between each lens. For example, the air gap distance between the first lens 10 and the second lens 20 is called G12, the air gap distance between the second lens 20 and the third lens 30 is called G23, and the air gap distance between the third lens 30 and the fourth lens 40 is called G34. Therefore, the sum of the distances of the three air gaps between the lenses located on the optical axis I from the first lens 10 to the fourth lens 40 is called AAG. That is, AAG = G12 + G23 + G34.

[0050] D22t32 is the distance on the optical axis from the image-side surface of the second lens to the image-side surface of the third lens, which is the sum of G23 and T3. 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, which is the sum of T1 and G12. D12t22 is the distance on the optical axis from the image-side surface of the first lens to the image-side surface of the second lens, which is the sum of G12 and T2. D32t42 is the distance on the optical axis from the image-side surface of the third lens to the image-side surface of the fourth lens, which is the sum of G34 and T4.

[0051] Furthermore, the distance on the optical axis I from the object-side surface 11 of the first lens 10 to the image-side surface 4 is the system length TTL of the optical imaging lens 1. The effective focal length of the optical imaging lens 1 is EFL, and the distance on the optical axis I from the object-side surface 11 of the first lens 10 to the image-side surface 42 of the fourth lens 40 is TL. HFOV is the half-field of view of the optical imaging lens 1, i.e., half of the maximum field of view, ImgH (image height) is the image height of the optical imaging lens 1, and Fno is the aperture value of the optical imaging lens 1.

[0052] When the filter 3 is positioned between the optical transition element 5 and the imaging surface 4, G4P represents the air gap between the fourth lens 40 and the optical transition element 5 on the optical axis I, TP represents the distance from the object side of the optical transition element 5 to the imaging surface 4 on the optical axis I, TF represents the thickness of the filter 3 on the optical axis I, GFP represents the air gap between the filter 3 and the imaging surface 4 on the optical axis I, and BFL is the back focal length of the optical imaging lens 1, which is the distance from the image side 42 of the fourth lens 40 to the imaging surface 4 on the optical axis I, i.e., BFL = G4P + TP.

[0053] Furthermore, the following definitions apply: f1 is the focal length of the first lens 10; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; n1 is the nd refractive index of the first lens 10; n2 is the nd refractive index of the second lens 20; n3 is the nd refractive index of the third lens 30; n4 is the nd refractive index of the fourth lens 40; υ1 is the Vd Abbe number of the first lens 10; υ2 is the Vd Abbe number of the second lens 20; υ3 is the Vd Abbe number of the third lens 30; and υ4 is the Vd Abbe number of the fourth lens 40. The material parameters of the lenses disclosed in the optical data sheet of the embodiments are in the format of nd refractive index and Vd Abbe number in the International Glass Code, so that those skilled in the art can know the specific material implementation. Here, nd is the refractive index of the material at the d-helium yellow line of 587.56 nanometers, and Vd is calculated based on 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 data sheets of the embodiments are calculated based on the refractive index of the band in which the optical system is implemented. Since the primary wavelength of the embodiments of the present invention is 555 nanometers, the focal length values ​​of the present invention are calculated based on the refractive index of the material at 555 nanometers.

[0054] First Embodiment

[0055] Please refer to Figure 6A, which illustrates a first embodiment of the actual optical path of the optical imaging lens 1 of the present invention. Please refer to Figure 6B, which illustrates a first embodiment of the simulated optical path of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the first embodiment, please refer to Figure 7A; for the sagittal field curvature aberration, please refer to Figure 7B; for the tangential field curvature aberration, please refer to Figure 7C; and for the distortion aberration, please refer to Figure 7D. In all embodiments, the Y-axis of each spherical aberration diagram represents the field of view, with its highest point being 1.0. The Y-axis of each aberration and distortion diagram in the embodiments represents the image height; the image height in the first embodiment is 3.528 mm.

[0056] The optical imaging lens 1 of the first embodiment mainly consists of an aperture 2, four lenses with refractive indices, namely a first lens 10, a second lens 20, a third lens 30, and a fourth lens 40, an optical deflection element 5, and an imaging surface 4. The aperture 2 of the first embodiment is located on the side of the first lens 10 facing the object side A1, that is, it is located between the object side A1 and the first lens 10.

[0057] The first lens 10 has a positive refractive index. The optical axis region 13 of the object-side surface 11 of the first lens 10 is convex, and its circumferential region 14 is also convex. The optical axis region 16 of the image-side surface 12 of the first lens 10 is convex, and its circumferential region 17 is also convex. In this embodiment, both the object-side surface 11 and the image-side surface 12 of the first lens 10 are spherical, and the first lens is a spherical lens, but the present invention is not limited thereto.

[0058] The second lens 20 has a positive refractive index. The optical axis region 23 of the object-side surface 21 of the second lens 20 is convex, and its circumferential region 24 is also convex. The optical axis region 26 of the image-side surface 22 of the second lens 20 is concave, and its circumferential region 27 is also concave. Both the object-side surface 21 and the image-side surface 22 of the second lens 20 are aspherical, but this is not a limitation.

[0059] The third lens 30 has a negative refractive index. The optical axis region 33 of the object side 31 of the third lens 30 is convex, and its circumferential region 34 is also convex. The optical axis region 36 of the image side 32 of the third lens 30 is concave, and its circumferential region 37 is also concave. Both the object side 31 and the image side 32 of the third lens 30 are aspherical, but this is not a limitation.

[0060] The fourth lens 40 has a negative refractive index. The optical axis region 43 and its circumferential region 44 of the object-side surface 41 of the fourth lens 40 are concave, and the optical axis region 46 and its circumferential region 47 of the image-side surface 42 of the fourth lens 40 are convex. Both the object-side surface 41 and the image-side surface 42 of the fourth lens 40 are aspherical, but this is not a limitation. An optical deflection element 5 is disposed between the image-side surface 42 of the fourth lens 40 and the filter 3. The filter 3, for example, an infrared filtering filter, is disposed between the optical deflection element 5 and the imaging surface 4.

[0061] In the optical imaging lens 1 of the present invention, if all six curved surfaces—the object-side surfaces 21 / 31 / 41 and the image-side surfaces 22 / 32 / 42—from the second lens 20 to the fourth lens 40 are aspherical, then these aspherical surfaces are defined by the following formula:

[0062] in:

[0063] Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I;

[0064] 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 I and the tangent plane at the vertex on the optical axis I of the aspherical surface).

[0065] R represents the radius of curvature of the lens surface;

[0066] K is the conic constant.

[0067] ai represents the i-th order aspherical coefficient, where the a2 coefficient in each embodiment is 0.

[0068] The optical data of the optical imaging lens system in the first embodiment is shown in Figure 30. Figure 31 shows the aspherical data of the six curved surfaces (object side 21 / 31 / 41 and image side 22 / 32 / 42) of the second lens 20 to the fourth lens 40 in this embodiment; the same applies to the following embodiments. In the optical imaging lens system of the following embodiments, the overall aperture value (f-number) of the optical imaging lens is Fno, the effective focal length (EFL) is [value missing], and the half field of view (HFOV) is half of the maximum field of view of the overall optical imaging lens. The units for image height, radius of curvature, thickness, and focal length of the optical imaging lens are all millimeters (mm). In this embodiment, EFL = 16.882 mm; HFOV = 11.678 degrees; TTL = 20.549 mm; Fno = 2.800; ImgH = 3.528 mm.

[0069] Second Embodiment

[0070] Please refer to Figure 8, which illustrates a second embodiment of the optical imaging lens 1 of the present invention. Note that, starting with the second embodiment, for simplification and clarity of the diagrams, only the optical axis regions and circumferential regions of each lens with different surface shapes compared to the first embodiment are specifically marked on the figures. The optical axis regions and circumferential regions with the same surface shapes as the lenses in the first embodiment, such as concave or convex surfaces, are not separately marked. For the longitudinal spherical aberration on the imaging plane 4 in the second embodiment, please refer to Figure 9A; for the sagittal field curvature aberration, please refer to Figure 9B; for the meridional field curvature aberration, please refer to Figure 9C; and for the distortion aberration, please refer to Figure 9D. The design of the second embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the fourth lens 40 has a positive refractive index, and the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is concave.

[0071] Detailed optical data for the second embodiment is shown in Figure 32, and aspherical data is shown in Figure 33. In this embodiment, EFL = 16.791 mm; HFOV = 11.726 degrees; TTL = 20.076 mm; Fno = 2.800; ImgH = 3.528 mm. Specifically: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The half-angle of view of this embodiment is greater than that of the first embodiment.

[0072] Third Embodiment

[0073] Please refer to Figure 10, which illustrates a third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the third embodiment, please refer to Figure 11A; for the sagittal field curvature aberration, please refer to Figure 11B; for the meridional field curvature aberration, please refer to Figure 11C; and for the distortion aberration, please refer to Figure 11D. The design of the third embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the fourth lens 40 has a positive refractive index, and the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is concave.

[0074] Detailed optical data for the third embodiment is shown in Figure 34, and aspherical data is shown in Figure 35. In this embodiment, EFL = 16.785 mm; HFOV = 11.726 degrees; TTL = 20.613 mm; Fno = 2.800; ImgH = 3.528 mm. In particular, the half-angle of view in this embodiment is larger than that in the first embodiment.

[0075] Fourth embodiment

[0076] Please refer to Figure 12, which illustrates a fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the fourth embodiment, please refer to Figure 13A; for the sagittal field curvature aberration, please refer to Figure 13B; for the meridional field curvature aberration, please refer to Figure 13C; and for the distortion aberration, please refer to Figure 13D. The design of the fourth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the fourth lens 40 has a positive refractive index.

[0077] Detailed optical data for the fourth embodiment is shown in Figure 36, and aspherical data is shown in Figure 37. In this embodiment, EFL = 17.606 mm; HFOV = 7.740 degrees; TTL = 21.096 mm; Fno = 2.800; ImgH = 2.405 mm. Specifically: 1. The longitudinal spherical aberration of this embodiment is less than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of this embodiment is less than that in the sagittal direction of the first embodiment; 3. The field curvature aberration in the meridional direction of this embodiment is less than that in the meridional direction of the first embodiment; 4. The distortion aberration of this embodiment is less than that in the first embodiment.

[0078] Fifth Embodiment

[0079] Please refer to Figure 14, which illustrates a fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the fifth embodiment, please refer to Figure 15A; for the sagittal field curvature aberration, please refer to Figure 15B; for the meridional field curvature aberration, please refer to Figure 15C; and for the distortion aberration, please refer to Figure 15D. The design of the fifth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different.

[0080] Detailed optical data for the fifth embodiment is shown in Figure 38, and aspherical data is shown in Figure 39. In this embodiment, EFL = 16.899 mm; HFOV = 11.726 degrees; TTL = 21.036 mm; Fno = 2.800; ImgH = 3.525 mm. In particular, the half-angle of view in this embodiment is larger than that in the first embodiment.

[0081] Sixth Embodiment

[0082] Please refer to Figure 16, which illustrates a sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the sixth embodiment, please refer to Figure 17A; for the sagittal field curvature aberration, please refer to Figure 17B; for the meridional field curvature aberration, please refer to Figure 17C; and for the distortion aberration, please refer to Figure 17D. The design of the sixth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the fourth lens 40 has a positive refractive index.

[0083] Detailed optical data for the sixth embodiment is shown in Figure 40, and aspherical data is shown in Figure 41. In this embodiment, EFL = 16.858 mm; HFOV = 11.708 degrees; TTL = 20.787 mm; Fno = 2.800; ImgH = 3.528 mm. Specifically: 1. The half-angle of view in this embodiment is greater than that in the first embodiment; 2. The distortion aberration in this embodiment is less than that in the first embodiment.

[0084] Seventh Embodiment

[0085] Please refer to Figure 18, which illustrates a seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the seventh embodiment, please refer to Figure 19A; for the sagittal field curvature aberration, please refer to Figure 19B; for the meridional field curvature aberration, please refer to Figure 19C; and for the distortion aberration, please refer to Figure 19D. The design of the seventh embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the optical axis region 13 of the object-side surface 11 of the first lens 10 is concave, and its circumferential region 14 is concave; the optical axis region 26 of the image-side surface 22 of the second lens 20 is convex, and its circumferential region 27 is convex.

[0086] Detailed optical data for the seventh embodiment are shown in Figure 42, and aspherical data are shown in Figure 43. In this embodiment, EFL = 16.961 mm; HFOV = 11.727 degrees; TTL = 23.419 mm; Fno = 2.800; ImgH = 3.528 mm. Specifically: 1. The half-angle of view in this embodiment is greater than that in the first embodiment; 2. The distortion aberration in this embodiment is less than that in the first embodiment.

[0087] Eighth embodiment

[0088] Please refer to Figure 20, which illustrates an eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the eighth embodiment, please refer to Figure 21A; for the sagittal field curvature aberration, please refer to Figure 21B; for the meridional field curvature aberration, please refer to Figure 21C; and for the distortion aberration, please refer to Figure 21D. The design of the eighth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is concave.

[0089] Detailed optical data for the eighth embodiment is shown in Figure 44, and aspherical data is shown in Figure 45. In this embodiment, EFL = 16.719 mm; HFOV = 8.781 degrees; TTL = 20.108 mm; Fno = 2.800; ImgH = 2.600 mm. Specifically: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The distortion aberration of this embodiment is smaller than that of the first embodiment.

[0090] Ninth Embodiment

[0091] Please refer to Figure 22, which illustrates a ninth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the ninth embodiment, please refer to Figure 23A; for the sagittal field curvature aberration, please refer to Figure 23B; for the meridional field curvature aberration, please refer to Figure 23C; and for the distortion aberration, please refer to Figure 23D. The design of the ninth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is concave.

[0092] Detailed optical data for the ninth embodiment is shown in Figure 46, and aspherical data is shown in Figure 47. In this embodiment, EFL = 16.894 mm; HFOV = 11.729 degrees; TTL = 20.497 mm; Fno = 2.800; ImgH = 3.528 mm. Specifically: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The half-angle of view of this embodiment is greater than that of the first embodiment; 3. The distortion aberration of this embodiment is less than that of the first embodiment.

[0093] Tenth Embodiment

[0094] Please refer to Figure 24, which illustrates a tenth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the tenth embodiment, please refer to Figure 25A; for the sagittal field curvature aberration, please refer to Figure 25B; for the meridional field curvature aberration, please refer to Figure 25C; and for the distortion aberration, please refer to Figure 25D. The design of the tenth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the fourth lens 40 has a positive refractive index.

[0095] Detailed optical data for the tenth embodiment is shown in Figure 48, and aspherical data is shown in Figure 49. In this embodiment, EFL = 16.934 mm; HFOV = 11.722 degrees; TTL = 21.439 mm; Fno = 2.800; ImgH = 3.528 mm. Specifically: 1. The half-angle of view in this embodiment is greater than that in the first embodiment; 2. The distortion aberration in this embodiment is less than that in the first embodiment.

[0096] Eleventh Embodiment

[0097] Please refer to Figure 26, which illustrates the eleventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the eleventh embodiment, please refer to Figure 27A; for the sagittal field curvature aberration, please refer to Figure 27B; for the meridional field curvature aberration, please refer to Figure 27C; and for the distortion aberration, please refer to Figure 27D. The design of the eleventh embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the optical axis region 13 of the object-side surface 11 of the first lens 10 is concave, and its circumferential region 14 is also concave; the optical axis region 26 of the image-side surface 22 of the second lens 20 is convex, and its circumferential region 27 is also convex; the third lens 30 has a positive refractive index; the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex; and the optical axis region 46 of the image-side surface 42 of the fourth lens 40 is concave, and its circumferential region 47 is also concave.

[0098] Detailed optical data for the eleventh embodiment is shown in Figure 50, and aspherical data is shown in Figure 51. In this embodiment, EFL = 14.565 mm; HFOV = 15.999 degrees; TTL = 19.749 mm; Fno = 2.800; ImgH = 4.188 mm. Specifically: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The half-angle of view of this embodiment is greater than that of the first embodiment; 3. The distortion aberration of this embodiment is less than that of the first embodiment.

[0099] Twelfth Embodiment

[0100] Please refer to Figure 28, which illustrates the twelfth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the twelfth embodiment, please refer to Figure 29A; for the sagittal field curvature aberration, please refer to Figure 29B; for the meridional field curvature aberration, please refer to Figure 29C; and for the distortion aberration, please refer to Figure 29D. The design of the twelfth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different.

[0101] Detailed optical data for the twelfth embodiment is shown in Figure 52, and aspherical data is shown in Figure 53. In this embodiment, EFL = 16.827 mm; HFOV = 11.730 degrees; TTL = 20.404 mm; Fno = 2.800; ImgH = 3.528 mm. In particular, the half-angle of view in this embodiment is greater than that in the first embodiment.

[0102] In addition, the important parameters of each embodiment are summarized in Figures 54 and 55 respectively.

[0103] The various embodiments of the present invention have the following advantages:

[0104] 1. When the second lens 20 has a positive refractive index, it can converge and gather light rays from different angles. Combined with the convex optical axis region 16 of the image side 12 of the first lens 10, it can correct the aberration of the central field of view of the imaging plane. In addition, the surface shape of the circumferential region of the lens, for example, the convex circumferential region 34 of the object side 31 of the third lens 30 combined with the concave circumferential region 44 of the object side 41 of the fourth lens 40, can further correct the distortion of the edge field of view. Furthermore, through the matching of focal length and lens length, when (EFL+TTL) / D22t32≧33.000 is met, it can not only effectively enhance the telephoto capability of the lens, but also maintain the image quality. The preferred range of (EFL+TTL) / D22t32 is 163.500≧(EFL+TTL) / D22t32≧33.000.

[0105] 2. Continuing from 1, when the first lens 10 is further satisfied to have a positive refractive index, the assembly yield can be improved.

[0106] 3. When the second lens 20 has a positive refractive index, it can converge light rays from different angles. Combined with the fact that the optical axis region 16 of the image side surface 12 of the first lens 10 is convex, it can correct the aberration of the central field of view of the imaging plane. In addition, the surface shape of the circumferential region of the lens is specific. For example, the circumferential region 34 of the object side surface 31 of the third lens 30 is convex and the circumferential region 44 of the object side surface 41 of the fourth lens 40 is concave. This can further correct the distortion of the edge field of view. Furthermore, through the combination of focal length and lens thickness, when (EFL+BFL) / (T1+T2)≧7.900 is met, it can not only effectively enhance the telephoto capability of the lens, but also maintain the image quality. The preferred range of (EFL+BFL) / (T1+T2) is 20.500≧(EFL+BFL) / (T1+T2)≧7.900.

[0107] 4. Continuing from point 3, when the first lens 10 is further satisfied with having a positive refractive index, the assembly yield can be improved.

[0108] 5. When the second lens 20 has a positive refractive index, it can converge and gather light rays from different angles. Combined with the fact that the optical axis region 16 of the image side surface 12 of the first lens 10 is convex, it can correct the aberration of the central field of view of the imaging plane. In addition, the surface shape of the circumferential region of the lens is specific. For example, the circumferential region 34 of the object side surface 31 of the third lens 30 is convex and the circumferential region 44 of the object side surface 41 of the fourth lens 40 is concave, which can further correct the distortion of the edge field of view. Through the combination of focal length and lens thickness, when (EFL+T1) / (ALT+G23+G34)≧2.500 is met, it can not only effectively enhance the telephoto capability of the lens, but also maintain the image quality. The preferred range of (EFL+T1) / (ALT+G23+G34) is 5.750≧(EFL+T1) / (ALT+G23+G34)≧2.500.

[0109] 6. Continuing from 5, when the first lens 10 is further satisfied with having a positive refractive index, the assembly yield can be improved.

[0110] 7. When the lens material meets the following configuration relationship, it is beneficial to the transmission and refraction of imaging light, and at the same time effectively improves chromatic aberration, so that the optical imaging lens has excellent optical quality.

[0111] The optimal range is 114.000≦|υ1-υ2|*υ3≦350.000.

[0112] υ3+υ4≦55.000, the preferred range is 40.000≦υ3+υ4≦55.000.

[0113] (υ1*υ2) / υ4≧120.000, the preferred range is 180.000≧(υ1*υ2) / υ4≧120.000.

[0114] The optimal range is 82.500 ≧ υ2*υ3 / υ4 ≧ 50.000.

[0115] υ1 / (υ2-2*υ3)≧8.500, the optimal range is 13.500≧υ1 / (υ2-2*υ3)≧8.500.

[0116] The optimal range is 8.000≦υ3*υ4 / υ1≦12.000.

[0117] 8. In order to increase the system focal length and ensure image quality, while taking into account the ease of manufacturing, and avoiding any parameter being too large and thus detrimental to improving the aberrations of the optical lens system, or any parameter being too small and thus affecting assembly, if the following conditional numerical limits are met, the embodiments of the present invention can have a better configuration.

[0118] (EFL+TTL) / D22t32≧33.000, the preferred range is 163.500≧(EFL+TTL) / D22t32≧33.000.

[0119] (EFL+BFL) / (T1+T2)≧7.900, with the optimal range being 20.500≧(EFL+BFL) / (T1+T2)≧7.900.

[0120] (EFL+T1) / (ALT+G23+G34)≧2.500, with the optimal range being 5.750≧(EFL+T1) / (ALT+G23+G34)≧2.500.

[0121] (TTL+G34) / (G23+T4)≧32.500, the preferred range is 65.500≧(TTL+G34) / (G23+T4)≧32.500.

[0122] (TTL+T4) / HFOV≧1.260 mm / degree, with a preferred range of 3.100≧(TTL+T4) / HFOV≧1.260 mm / degree.

[0123] (EFL+T4) / D11t21≧11.300, the optimal range is 24.000≧(EFL+T4) / D11t21≧11.300.

[0124] HFOV / Fno*(G12+T3)≦2.700 degrees·mm, with a preferred range of 1.000≦HFOV / Fno*(G12+T3)≦2.700 degrees·mm.

[0125] (BFL+G34) / AAG≧8.000, with a preferred range of 58.000≧(BFL+G34) / AAG≧8.000.

[0126] (TTL+T2+G34) / (AAG+T1)≧6.500, with the preferred range being 21.000≧(TTL+T2+G34) / (AAG+T1)≧6.500.

[0127] (TL+T1+G23) / (AAG+T2+G34)≦2.000, with a preferred range of 1.100≦(TL+T1+G23) / (AAG+T2+G34)≦2.000.

[0128] HFOV*T1 / (ALT+T3)≦6.300 degrees, with the optimal range being 2.300≦HFOV*T1 / (ALT+T3)≦6.300 degrees.

[0129] (BFL+G34) / (TL+G23)≧2.400, with the preferred range being 5.500≧(BFL+G34) / (TL+G23)≧2.400.

[0130] (BFL+T2+T3) / D11t21≧10.000, the preferred range is 25.000≧(BFL+T2+T3) / D11t21≧10.000.

[0131] Fno / (G12+T4)≧4.500, with the optimal range being 17.000≧Fno / (G12+T4)≧4.500.

[0132] Fno*T2 / AAG≧1.300, with the preferred range being 18.300≧Fno*T2 / AAG≧1.300.

[0133] The optimal range is 178.000 ≥ 1mgH*T2 / G12 ≥ 16.000.

[0134] Fno*ALT / G12≧95.000, with the optimal range being 263.800≧Fno*ALT / G12≧95.000.

[0135] The optimal range is 76.700 ≥ (EFL+D12t22)*ImgH ≥ 45.000.

[0136] The optimal range is 15.500 ≥ 1 mgH / D22t32 ≥ 3.000.

[0137] (TL+G34) / (G23+T4)≧7.500, the optimal range is 22.800≧(TL+G34) / (G23+T4)≧7.500.

[0138] (ALT+T3) / T4≧6.800, with the optimal range being 29.000≧(ALT+T3) / T4≧6.800.

[0139] (ALT+D32t42) / G12≧40.000, the preferred range is 141.000≧(ALT+D32t42) / G12≧40.000.

[0140] 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.

[0141] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the length of the system, have a small aperture value, increase the image height, improve the image quality, or improve the assembly yield and thus improve the shortcomings of the prior art. Furthermore, the use of plastic material for the lens in the embodiments of the present invention can further reduce the weight of the lens and save costs.

[0142] 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.

[0143] 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 comparison relationships between the optical parameters, and the conditional ranges covered by the multiple embodiments are as follows:

[0144] (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.

[0145] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0146] (3) The range of conditional expressions covered by multiple embodiments, specifically, refers to the combination or proportional relationship obtained by possible calculations of a plurality of optical parameters of the same embodiment, and these relationships are defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B)1 / 2, and E satisfies the condition E≦γ1 or E≧γ2 or γ2≦E≦γ1, where γ1 and γ2 are the values ​​obtained by calculations of optical parameter A and optical parameter B of 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.

[0147] 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.

[0148] 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. The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made in accordance with the claims of the present invention shall be covered by the present invention.

[0149] 1: Optical imaging lens 2: Aperture 3: Filter 4: Imaging plane 5: Optical Conversion Element 11, 21, 31, 41: Side view of the object 12, 22, 32, 42: side view 13, 16, 23, 26, 33, 36, 43, 46, Z1: Optical axis region 14, 17, 24, 27, 34, 37, 44, 47, Z2: Circumferential region 10: First lens 20: Second lens 30: Third Lens 40: Fourth Lens 100, 200, 300, 400, 500: Lenses 130: Assembly Department 211, 212: Parallel rays 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 I1: First optical axis I2: Second optical axis Lc: Main Ray Lm: Edge ray EL: Extension line Z3: Relay Area M, R: Intersection points

Claims

1. An optical imaging lens, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein each of the first to fourth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes: A region along the optical axis of the image-side surface of the first lens is convex; the second lens has a positive refractive index; a circumferential region of the object-side surface of the third lens is convex; and a circumferential region of the object-side surface of the fourth lens is concave; wherein, The optical imaging lens has only the four lenses mentioned above. υ2 is defined as the Vd Abbe number of the second lens, υ3 as the Vd Abbe number of the third lens, υ4 as the Vd Abbe number of the fourth lens, EFL as the effective focal length of the optical imaging lens, TTL as the distance from the object side of the first lens to an image plane on the optical axis, and D22t32 as the distance from the image side of the second lens to the image side of the third lens on the optical axis, and satisfies the following conditions: υ2*υ3 / υ4≧50.000, (EFL+TTL) / D22t32≧33.

000.

2. An optical imaging lens, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein each of the first to fourth 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: A region along the optical axis of the image-side surface of the first lens is convex; the second lens has a positive refractive index; a circumferential region of the object-side surface of the third lens is convex; and a circumferential region of the object-side surface of the fourth lens is concave; wherein, The optical imaging lens has only the four lenses mentioned above. υ2 is defined as the Vd Abbe number of the second lens, υ3 as the Vd Abbe number of the third lens, υ4 as the Vd Abbe number of the fourth lens, EFL as the effective focal length of the optical imaging lens, BFL as the distance from the image side of the fourth lens to an imaging plane on the optical axis, T1 as the thickness of the first lens on the optical axis, and T2 as the thickness of the second lens on the optical axis, and satisfies the following conditions: υ2*υ3 / υ4≧50.000, (EFL+BFL) / (T1+T2)≧7.

900.

3. An optical imaging lens as described in either Request 1 or Request 2, wherein Fno is defined as the aperture value of the optical imaging lens, ALT is defined as the total thickness of the four lenses from the first lens to the fourth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: Fno*ALT / G12≧95.

000.

4. An optical imaging lens as described in either Request 1 or Request 2, wherein TL is defined as the distance on the optical axis from the object side of the first lens to the image side of the fourth lens, G34 is defined as the air gap on the optical axis between the third and fourth lenses, G23 is defined as the air gap on the optical axis between the second and third lenses, T4 is defined as the thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: (TL+G34) / (G23+T4) ≥ 7.

500.

5. An optical imaging lens as described in either Request 1 or Request 2, wherein ALT is defined as the total thickness of the four lenses from the first lens to the fourth lens on the optical axis, D32t42 is defined as the distance from the image side of the third lens to the image side of the fourth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (ALT+D32t42) / G12≧40.

000.

6. An optical imaging lens, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein each of the first to fourth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes: a region along the optical axis of the image-side surface of the first lens is convex; the second lens has a positive refractive index; a circumferential region of the object-side surface of the third lens is convex; and a circumferential region of the object-side surface of the fourth lens is concave; wherein, The optical imaging lens has only the four lenses mentioned above. υ2 is defined as the Vd Abbe number of the second lens, υ3 as the Vd Abbe number of the third lens, υ4 as the Vd Abbe number of the fourth lens, EFL as the effective focal length of the optical imaging lens, T1 as the thickness of the first lens on the optical axis, ALT as the sum of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis, G23 as the air gap between the second and third lenses on the optical axis, and G34 as the air gap between the third and fourth lenses on the optical axis, and satisfies the following conditions: υ2*υ3 / υ4≧50.000, (EFL+T1) / (ALT+G23+G34)≧2.

500.

7. An optical imaging lens as described in either Request 2 or Request 6, wherein TTL is defined as the distance from the object side of the first lens to an imaging surface on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, HFOV is defined as the half angle of view of the optical imaging lens, and the optical imaging lens satisfies the following condition: (TTL+T4) / HFOV≧1.

260.

8. An optical imaging lens as described in either Request 2 or Request 6, wherein ImgH is defined as the image height of the optical imaging lens, D22t32 is defined as the distance on the optical axis from the image side surface of the second lens to the image side surface of the third lens, and the optical imaging lens satisfies the following condition: ImgH / D22t32 ≥ 3.

000.

9. An optical imaging lens as described in either Request 1 or Request 6, wherein ImgH is defined as the image height of the optical imaging lens, T2 is defined as the thickness of the second lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: ImgH*T2 / G12≧16.

000.

10. An optical imaging lens as described in either claim 1 or claim 6, wherein BFL is defined as the distance from the image-side surface of the fourth lens to an imaging surface on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, D11t21 is defined as the distance from the object-side surface of the first lens to the object-side surface of the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (BFL+T2+T3) / (D11t21)≧10.

000.

11. An optical imaging lens as described in any of Request 1, Request 2, and Request 6, wherein T4 is defined as the thickness of the fourth lens on the optical axis, D11t21 is defined as the distance on the optical axis from the object side of the first lens to the object side of the second lens, and the optical imaging lens satisfies the following condition: (EFL+T4) / D11t21≧11.

300.

12. An optical imaging lens as described in any of Request 1, Request 2, and Request 6, wherein υ1 is defined as the Vd Abbe number of the first lens, and the optical imaging lens satisfies the following condition: |υ1-υ2|*υ3≦350.

000.

13. An optical imaging lens of any one of Request 1, Request 2 and Request 6, and satisfying the following condition: υ3+υ4≦55.

000.

14. An optical imaging lens as described in any of Request 1, Request 2 and Request 6, wherein υ1 is defined as the Vd Abbe number of the first lens, and the optical imaging lens satisfies the following condition: (υ1*υ2) / υ4≧120.

000.

15. An optical imaging lens as described in any of Request 1, Request 2, and Request 6, wherein D12t22 is defined as the distance on the optical axis from the image side of the first lens to the image side of the second lens, ImgH is defined as the image height of the optical imaging lens, and the optical imaging lens satisfies the following condition: (EFL+D12t22)*ImgH≧45.

000.

16. An optical imaging lens as described in any of Request 1, Request 2, and Request 6, wherein HFOV is defined as the half angle of view of the optical imaging lens, Fno is defined as the aperture value of the optical imaging lens, G12 is defined as the air gap between the first lens and the second lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: HFOV / Fno*(G12+T3)≦2.

700.

17. An optical imaging lens as described in any of Request 1, Request 2 and Request 6, wherein υ1 is defined as the Vd Abbe number of the first lens, and the optical imaging lens satisfies the following condition: υ1 / (υ2-2*υ3)≧8.

500.

18. An optical imaging lens as described in any of Request 1, Request 2 and Request 6, wherein υ1 is defined as the Vd Abbe number of the first lens, and the optical imaging lens satisfies the following condition: υ3*υ4 / υ1<12.

000.

19. An optical imaging lens as described in any of Request 1, Request 2 and Request 6, wherein Fno is defined as the aperture value of the optical imaging lens, G12 is defined as the air gap between the first lens and the second lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: Fno / (G12+T4) ≥ 4.500.