Shooting optical lens

Abstract

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which comprises a first prism with refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power and a fifth lens with positive refractive power which are sequentially arranged from an object side to an image side, a sixth lens element with refractive power; and a second prism. A lens group formed by the fourth lens, the fifth lens and the sixth lens can move along the direction of an optical axis, so that the shooting optical lens can be switched between a first state and a second state; wherein the focal length of the shooting optical lens in a first state is fa, the combined focal length of the fourth lens, the fifth lens and the sixth lens is f456, the total optical length of the shooting optical lens is TTL, the axial distance from the image side surface to the image surface of the sixth lens in the first state is BF, and the following relational expressions are satisfied: fa / f456 is greater than or equal to-3.00 and less than or equal to-2.00; and 0.40 < = BF / TTL < = 0.81.

Description

Technical Field

[0001] The present invention relates to the field of optical lenses, and particularly to an imaging optical lens applicable to handheld terminal devices such as smart phones and digital cameras, as well as imaging devices such as monitors, PC lenses, and vehicle-mounted lenses. Background Art

[0002] In recent years, with the rise of various intelligent devices, the demand for miniaturized imaging optical lenses has been increasing day by day. Moreover, due to the reduction of the pixel size of photosensitive devices, and coupled with the current development trend of electronic products towards a good-functioning, thin, light, and portable form factor, therefore, miniaturized imaging optical lenses with good imaging quality have become the mainstream in the current market. To obtain better imaging quality, a multi-lens structure is often adopted. And, with the development of technology and the increasing diversification of user needs, in the case where the pixel area of the photosensitive device is continuously shrinking and the system's requirements for imaging quality are continuously increasing, a structure combining a lens and a prism has gradually emerged in lens design. There is an urgent need for a periscope telephoto imaging optical lens with excellent optical characteristics, small size, and fully corrected aberrations. Summary of the Invention

[0003] In view of the above problems, an object of the present invention is to provide an imaging optical lens that, while having good optical performance, meets the design requirements of fully corrected aberrations, telephoto magnification, and miniaturization.

[0004] To achieve the above object, the technical solution of the present invention provides an imaging optical lens, which includes, sequentially arranged from the object side to the image side: a first prism having refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having refractive power, and a second prism; a first reflecting surface is provided between the object side surface and the image side surface of the first prism, and a second reflecting surface and a third reflecting surface are provided between the object side surface and the image side surface of the second prism; the light rays emerging from the image side surface of the sixth lens sequentially pass through the object side surface of the second prism, the second reflecting surface, the third reflecting surface, and then emerge from the image side surface of the second prism; the lens group composed of the fourth lens, the fifth lens, and the sixth lens can move along the optical axis direction so that the imaging optical lens switches between a first state and a second state;

[0005] Wherein, the focal length of the imaging optical lens in the first state is fa, the combined focal length of the fourth lens, the fifth lens, and the sixth lens is f456, the overall optical length of the imaging optical lens is TTL, and the on-axis distance from the image side surface of the sixth lens to the image plane in the first state is BF, and the following relational expressions are satisfied:

[0006] -3.00 ≤ fa / f456 ≤ -2.00;

[0007] 0.40 ≤ BF / TTL ≤ 0.81.

[0008] Preferably, the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens at the paraxial region is R3, and the central curvature radius of the image side surface of the second lens at the paraxial region is R4, satisfying the following relational expression:

[0009] 0.30 ≤ f2 / (R3 - R4) ≤ 0.60.

[0010] Preferably, the on-axis thickness of the fourth lens is T4, the on-axis thickness of the fifth lens is T5, the on-axis thickness of the sixth lens is T6, the on-axis distance from the image side surface of the fourth lens to the object side surface of the fifth lens is T45, and the on-axis distance from the image side surface of the fifth lens to the object side surface of the sixth lens is T56, satisfying the following relational expression:

[0011] 4.00 ≤ (T4 + T5 + T6) / (T45 + T56) ≤ 5.50.

[0012] Preferably, the central curvature radius of the object side surface of the fourth lens at the paraxial region is R7, and the central curvature radius of the image side surface of the fourth lens at the paraxial region is R8, satisfying the following relational expression:

[0013] 1.40 ≤ (R7 + R8) / (R7 - R8) ≤ 2.80.

[0014] Preferably, the object side surface of the first prism is convex at the paraxial region; the focal length of the first prism is f1, the on-axis thickness of the first prism is T1, and satisfying the following relational expressions:

[0015] -1.68 ≤ f1 / fa ≤ 21.13;

[0016] 0.14 ≤ T1 / TTL ≤ 0.22.

[0017] Preferably, the object side surface of the second lens is convex at the paraxial region, and the image side surface of the second lens is convex at the paraxial region; the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens at the paraxial region is R3, the central curvature radius of the image side surface of the second lens at the paraxial region is R4, the on-axis thickness of the second lens is T2, and satisfying the following relational expressions:

[0018] 0.24 ≤ f2 / fa ≤ 0.66;

[0019] -0.40 ≤ (R3 + R4) / (R3 - R4) ≤ 0.60;

[0020] 0.01 ≤ T2 / TTL ≤ 0.11.

[0021] Preferably, the focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens at the paraxial region is R5, the central curvature radius of the image side surface of the third lens at the paraxial region is R6, and the on-axis thickness of the third lens is T3, and the following relational expressions are satisfied:

[0022] -3.87 ≤ f3 / fa ≤ -1.56;

[0023] -1.01 ≤ (R5 + R6) / (R5 - R6) ≤ 2.20;

[0024] 0.002 ≤ T3 / TTL ≤ 0.030.

[0025] Preferably, the object side surface of the fourth lens is convex at the paraxial region, and the image side surface of the fourth lens is concave at the paraxial region; the focal length of the fourth lens is f4, and the on-axis thickness of the fourth lens is T4, and the following relational expressions are satisfied:

[0026] -0.34 ≤ f4 / fa ≤ -0.20;

[0027] 0.001 ≤ T4 / TTL ≤ 0.028.

[0028] Preferably, the object side surface of the fifth lens is convex at the paraxial region; the image side surface of the fifth lens is concave at the paraxial region; the focal length of the fifth lens is f5, the central curvature radius of the object side surface of the fifth lens at the paraxial region is R9, the central curvature radius of the image side surface of the fifth lens at the paraxial region is R10, and the on-axis thickness of the fifth lens is T5, and the following relational expressions are satisfied:

[0029] 0.41 ≤ f5 / fa ≤ 0.81;

[0030] -5.71 ≤ (R9 + R10) / (R9 - R10) ≤ -2.11;

[0031] 0.01 ≤ T5 / TTL ≤ 0.11.

[0032] Preferably, the object side surface of the sixth lens is convex at the paraxial region; the image side surface of the sixth lens is concave at the paraxial region; the focal length of the sixth lens is f6, the central curvature radius of the object side surface of the sixth lens at the paraxial region is R11, the central curvature radius of the image side surface of the sixth lens at the paraxial region is R12, and the on-axis thickness of the sixth lens is T6, and the following relational expressions are satisfied:

[0033] -1.86 ≤ f6 / fa ≤ 1.05;

[0034] -7.55 ≤ (R11 + R12) / (R11 - R12) ≤ 7.30;

[0035] 0.001 ≤ T6 / TTL ≤ 0.020.

[0036] The beneficial effects of the present invention are as follows: The imaging optical lens according to the present invention has excellent optical characteristics, and has the characteristics of sufficient aberration correction, long focal length, and miniaturization. It is particularly suitable for mobile phone imaging lens assemblies, WEB imaging lenses, and vehicle-mounted lenses composed of imaging elements such as CCDs and CMOSs for high pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0038] Figure 1 is a schematic structural diagram of the imaging optical lens according to the first embodiment of the present invention in the first state;

[0039] Figure 2 is Figure 1 a schematic diagram of the axial aberration of the shown imaging optical lens;

[0040] Figure 3 is Figure 1 a schematic diagram of the lateral chromatic aberration of the shown imaging optical lens;

[0041] Figure 4 is Figure 1 a schematic diagram of the field curvature and distortion of the shown imaging optical lens;

[0042] Figure 5 is a schematic structural diagram of the imaging optical lens according to the first embodiment of the present invention in the second state;

[0043] Figure 6 is Figure 5 a schematic diagram of the axial aberration of the shown imaging optical lens;

[0044] Figure 7 is a schematic diagram of the lateral chromatic aberration of the shown imaging optical lens;

[0045] Figure 6 is Figure 8 a schematic diagram of the field curvature and distortion of the shown imaging optical lens;

[0046] Figure 7 is a schematic structural diagram of the imaging optical lens according to the second embodiment of the present invention in the first state;

[0047] Figure 9 isFigure 10 Schematic diagram of axial aberration of the shown imaging optical lens;

[0048] Figure 9 is Figure 11 Schematic diagram of lateral chromatic aberration of the shown imaging optical lens;

[0049] Figure 9 is Figure 12 Schematic diagram of field curvature and distortion of the shown imaging optical lens;

[0050] Figure 9 Schematic diagram of the structure of the imaging optical lens according to the second embodiment of the present invention in the second state;

[0051] Figure 13 is Figure 14 Schematic diagram of axial aberration of the shown imaging optical lens;

[0052] Figure 13 is Figure 15 Schematic diagram of lateral chromatic aberration of the shown imaging optical lens;

[0053] Figure 13 is Figure 16 Schematic diagram of field curvature and distortion of the shown imaging optical lens;

[0054] Figure 13 Schematic diagram of the structure of the imaging optical lens according to the third embodiment of the present invention in the first state;

[0055] Figure 17 is Figure 18 Schematic diagram of axial aberration of the shown imaging optical lens;

[0056] Figure 17 is Figure 19 Schematic diagram of lateral chromatic aberration of the shown imaging optical lens;

[0057] Figure 17 is Figure 20 Schematic diagram of field curvature and distortion of the shown imaging optical lens;

[0058] Figure 17 Schematic diagram of the structure of the imaging optical lens according to the third embodiment of the present invention in the second state;

[0059] Figure 21 is Figure 22 Schematic diagram of axial aberration of the shown imaging optical lens;

[0060] Figure 21 is Figure 23 Schematic diagram of lateral chromatic aberration of the shown imaging optical lens;

[0061] Figure 21 is Figure 24Schematic diagram of the field curvature and distortion of the shown imaging optical lens; Detailed implementation manners

[0062] To make the objectives, technical solutions and advantages of the present invention clearer, the following will elaborate on each implementation manner of the present invention with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present invention, many technical details are provided for readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions claimed by the present invention can still be achieved.

[0063] Refer to the attached Figure 21 drawings, the technical solution of the present invention provides an imaging optical lens 10, 20, 30. Figures 1 - 24 and Figure 1 , Figure 5 and Figure 9 , Figure 13 and Figure 17 Shown in the drawings are the imaging optical lenses 10, 20, 30 of the present invention. The imaging optical lenses 10, 20, 30 altogether include seven lenses. Specifically, the imaging optical lens, from the object side to the image side in sequence, is: the first prism P1, the aperture S1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the second prism P2. Optical elements such as an optical filter (filter) GF can be provided between the second prism P2 and the image plane Si.

[0064] Specifically, a first reflecting surface is provided between the object side surface and the image side surface of the first prism P1, and a second reflecting surface and a third reflecting surface are provided between the object side surface and the image side surface of the second prism P2. After the light enters the object side surface of the first prism P1 along the first direction, it is reflected by the first reflecting surface and transmitted along the second direction perpendicular to the first direction to the image side surface of the first prism P1; the light exiting from the image side surface of the first prism P1 sequentially passes through the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 along the second direction and then enters the object side surface of the second prism P2. The light sequentially passes through the object side surface of the second prism P2, the second reflecting surface, and the third reflecting surface and is then reflected to exit from the image side surface of the second prism P2 along the third direction. The third direction is perpendicular to the first direction and the second direction. The light exiting from the image side surface of the second prism P2 is transmitted along the third direction to the image plane Si. By providing the first prism P1, the propagation direction of the light is changed from the first direction to the second direction perpendicular to the first direction, so that the light propagates along the second direction, which can reduce the thickness of the imaging optical lens along the first direction and make the imaging optical lens conform to the development trend of ultra-thinness. By providing the second prism with two reflecting surfaces, the length of the optical system in the second direction can be compressed, making the imaging optical lens conform to the development trend of miniaturization. As shown in the appendix Figure 21 As shown, the first direction is the X direction, the second direction is the Y direction, and the third direction is the Z direction.

[0065] The lens group composed of the fourth lens L4, the fifth lens L5, and the sixth lens L6 can move along the optical axis direction so that the imaging optical lens can be switched between a first state and a second state. It can be understood that the first state is the use state when the object is at infinity (i.e., when the object distance is infinite), and the second state is the use state when the object distance is 1000 mm, so that the imaging optical lens still has excellent optical performance when the focusing distance is 1000 mm.

[0066] Specifically, the lens group composed of the fourth lens L4, the fifth lens L5, and the sixth lens L6 can move along the second direction, so that the axial distance from the image side of the third lens L3 to the object side of the fourth lens L4 and the axial distance from the image side of the sixth lens L6 to the object side of the second prism P2 can be adjusted. In this way, the imaging optical lens can be switched between the first state and the second state, and the focal lengths of the imaging optical lenses 10, 20, and 30 can be changed, so that the imaging optical lenses 10, 20, and 30 have good imaging effects in both the first state and the second state. It should be noted that when the lens group composed of the fourth lens L4, the fifth lens L5, and the sixth lens L6 moves along the second direction, the axial distance between the fourth lens L4 and the fifth lens L5 and the axial distance between the fifth lens L5 and the sixth lens L6 remain fixed, that is, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are relatively fixed to each other.

[0067] When the distance between the object to be photographed and the imaging optical lens is relatively large, there is no need to move the lens group composed of the fourth lens L4, the fifth lens L5, and the sixth lens L6 along the second direction at this time. The imaging optical lens is in the first state, and focusing is achieved by moving the imaging optical lens as a whole; when the distance between the object to be photographed and the imaging optical lens is 1000 mm, by moving the lens group composed of the fourth lens L4, the fifth lens L5, and the sixth lens L6 along the second direction, the imaging optical lens is switched to the second state, and then focusing is performed by moving the imaging optical lens in the second state as a whole, so that the imaging optical lens still has good optical performance in macro mode.

[0068] The first prism P1 and the second prism P2 are both made of glass, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. Each lens can also be made of other materials.

[0069] Define the focal length of the imaging optical lens in the first state as fa, and the combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6 as f456, which satisfies the following relational expression: -3.00 ≤ fa / f456 ≤ -2.00. This specifies the ratio of the total focal length of the system to the combined focal length of the lens group composed of the fourth lens L4, the fifth lens L5, and the sixth lens L6 that can move along the optical axis direction. Within the range of the conditional expression, by reasonably distributing the optical focal lengths of the optical system, the optical system has better imaging quality and lower sensitivity.

[0070] Define the overall optical length of the imaging optical lens as TTL, and the on-axis distance from the image side of the sixth lens L6 to the image plane Si in the first state as BF. The following relational expression is satisfied: 0.40 ≤ BF / TTL ≤ 0.81. Within the range of the conditional expression, not only can miniaturization be achieved, but on this basis, the back focal length can be controlled within the range of the conditional expression, which is beneficial to the assembly of the module and can effectively control the total length of the optical system at the same time.

[0071] When the above conditional expression is satisfied, the imaging optical lenses 10, 20, and 30 have good optical performance and can meet the design requirements of large aperture, long focal length, and miniaturization; according to the characteristics of the imaging optical lenses 10, 20, and 30, the imaging optical lenses 10, 20, and 30 are particularly suitable for mobile phone imaging lens assemblies and WEB imaging lenses composed of imaging elements such as high-pixel CCDs and CMOSs.

[0072] Based on the above conditional expression and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0073] Define the focal length of the second lens L2 as f2, the central curvature radius of the object side of the second lens L2 at the paraxial region as R3, and the central curvature radius of the image side of the second lens L2 at the paraxial region as R4. The following relational expression is satisfied: 0.30 ≤ f2 / (R3 - R4) ≤ 0.60. Within the range of the conditional expression, the surface shape of the second lens L2 is reasonably controlled, which is beneficial to reducing the sensitivity of the optical system, improving the manufacturing yield by reducing the forming difficulty, and at the same time can also reduce the stray light generated by the imaging optical lens and improve the imaging quality of the imaging optical lens.

[0074] Define the focal length of the imaging optical lens as f, the on-axis thickness of the fourth lens L4 as T4, the on-axis thickness of the fifth lens L5 as T5, the on-axis thickness of the sixth lens L6 as T6, the on-axis distance from the image side of the fourth lens L4 to the object side of the fifth lens L5 as T45, and the on-axis distance from the image side of the fifth lens L5 to the object side of the sixth lens L6 as T56. The following relational expression is satisfied: 4.00 ≤ (T4 + T5 + T6) / (T45 + T56) ≤ 5.50. Within the range of the conditional expression, by reasonably distributing the air gaps between the lenses, the degree of light deflection passing through the lenses can be alleviated, the chromatic aberration can be effectively corrected, and the chromatic aberration |LC| ≤ 2.4 μm.

[0075] Define the central curvature radius of the object side of the fourth lens L4 at the paraxial region as R7, and the central curvature radius of the image side of the fourth lens L4 at the paraxial region as R8, satisfying the following relational expression: 1.40 ≤ (R7 + R8) / (R7 - R8) ≤ 2.80. This defines the shape of the fourth lens L4. Within the range of the conditional expression, it is beneficial to correct the astigmatism and distortion of the imaging optical lens, such that the distortion |Distortion| ≤ 0.5%, and reduce the possibility of vignetting.

[0076] The first prism P1 has positive or negative refractive power. The object side of the first prism P1 is convex at the paraxial region, the first reflecting surface of the first prism P1 is flat, and the image side of the first prism P1 is concave or flat at the paraxial region. The object side and the image side of the first prism P1 can also be set to other concave and convex distribution situations. By setting the object side and / or the image side of the first prism P1 as surfaces with curvature, the convergence or divergence of light can be more flexibly controlled to adapt to different focal length requirements. By optimizing the curvature of the aspherical prism, the scattering of light at the edge can be reduced, the light input efficiency can be improved, especially in low-light environments, it helps to retain more details, reduce noise, and at the same time can also take into account the requirement of the device being thin and light, which helps the imaging optical lens to develop towards high image quality and multi-function.

[0077] The focal length of the first prism P1 is f1, and the focal length of the imaging optical lens in the first state is fa, satisfying the following relational expression: -1.68 ≤ f1 / fa ≤ 21.13. This defines the ratio of the refractive power of the first prism P1 to the overall focal length. When within the specified range, the light input efficiency is improved, the noise is reduced, and the optical performance of the periscope telephoto imaging optical lens is significantly improved.

[0078] The on-axis thickness of the first prism P1 is T1, and the overall optical length of the imaging optical lens is TTL, satisfying the following relational expression: 0.14 ≤ T1 / TTL ≤ 0.22. Within the range of the conditional expression, it is beneficial to achieve miniaturization.

[0079] The object side of the second lens L2 is convex at the paraxial region, and the image side is convex at the paraxial region. The second lens L2 has positive refractive power. The object side and the image side of the second lens L2 can also be set to other concave and convex distribution situations.

[0080] The focal length of the second lens L2 is f2, and the focal length of the imaging optical lens in the first state is fa, satisfying the following relational expression: 0.24 ≤ f2 / fa ≤ 0.66. By controlling the positive optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberration of the optical system.

[0081] The central curvature radius of the object side of the second lens L2 at the paraxial region is R3, and the central curvature radius of the image side of the second lens L2 at the paraxial region is R4, satisfying the following relational expression: -0.40 ≤ (R3 + R4) / (R3 - R4) ≤ 0.60. This defines the shape of the second lens L2. When within this range, with the development of miniaturization, it is beneficial to correct problems such as axial chromatic aberration.

[0082] The on-axis thickness of the second lens L2 is T2, and the overall optical length of the imaging optical lens is TTL, satisfying the following relational expression: 0.01 ≤ T2 / TTL ≤ 0.11. When within the range of this conditional expression, it is beneficial to achieve miniaturization.

[0083] The object side of the third lens L3 is convex or concave at the paraxial region, and the image side is concave or convex at the paraxial region. The third lens L3 has a negative refractive power. The object side and image side of the third lens L3 can also be set to other concave and convex distribution situations.

[0084] The focal length of the imaging optical lens in the first state is fa, and the focal length of the third lens L3 is f3, satisfying the following relational expression: -3.87 ≤ f3 / fa ≤ -1.56. Through reasonable distribution of the optical power, the system has better imaging quality and lower sensitivity.

[0085] The central curvature radius of the object side of the third lens L3 at the paraxial region is R5, and the central curvature radius of the image side of the third lens L3 at the paraxial region is R6, satisfying the following relational expression: -1.01 ≤ (R5 + R6) / (R5 - R6) ≤ 2.20. This defines the shape of the third lens L3. When within this range, with the development of miniaturization, it is beneficial to correct problems such as axial chromatic aberration.

[0086] The on-axis thickness of the third lens L3 is T3, and the overall optical length of the imaging optical lens is TTL, satisfying the following relational expression: 0.002 ≤ T3 / TTL ≤ 0.030. When within the range of this conditional expression, it is beneficial to achieve miniaturization.

[0087] The object side of the fourth lens L4 is convex at the paraxial region, and the image side is concave at the paraxial region. The fourth lens L4 has a negative refractive power. The object side and image side of the fourth lens L4 can also be set to other concave and convex distribution situations.

[0088] The focal length of the imaging optical lens in the first state is fa, and the focal length of the fourth lens L4 is f4, satisfying the following relational expression: -0.34 ≤ f4 / fa ≤ -0.20. Through reasonable distribution of the optical power, the system has better imaging quality and lower sensitivity.

[0089] The on-axis thickness of the fourth lens L4 is T4, and the overall optical length of the imaging optical lens is TTL, satisfying the following relationship: 0.001 ≤ T4 / TTL ≤ 0.028. Within the range of this conditional expression, it is beneficial to achieve miniaturization.

[0090] The object side of the fifth lens L5 is convex near the paraxial region, and the image side is concave near the paraxial region. The fifth lens L5 has positive refractive power. The object side and the image side of the fifth lens L5 can also be set to other concave and convex distribution cases.

[0091] The focal length of the imaging optical lens in the first state is fa, and the focal length of the fifth lens L5 is f5, satisfying the following relationship: 0.41 ≤ f5 / fa ≤ 0.81. By restricting the fifth lens L5, it can effectively make the light angle of the imaging optical lens gentle and reduce the tolerance sensitivity.

[0092] The central curvature radius of the object side of the fifth lens L5 near the paraxial region is R9, and the central curvature radius of the image side of the fifth lens L5 near the paraxial region is R10, satisfying the following relationship: -5.71 ≤ (R9 + R10) / (R9 - R10) ≤ -2.11. This specifies the shape of the fifth lens L5. When within the range, with the development of miniaturization, it is beneficial to correct problems such as axial chromatic aberration.

[0093] The on-axis thickness of the fifth lens L5 is T5, and the overall optical length of the imaging optical lens is TTL, satisfying the following relationship: 0.01 ≤ T5 / TTL ≤ 0.11. Within the range of this conditional expression, it is beneficial to achieve miniaturization.

[0094] The object side of the sixth lens L6 is convex near the paraxial region, and the image side is concave near the paraxial region. The sixth lens L6 has positive refractive power or negative refractive power. The object side and the image side of the sixth lens L6 can also be set to other concave and convex distribution cases.

[0095] The focal length of the imaging optical lens in the first state is fa, and the focal length of the sixth lens L6 is f6, satisfying the following relationship: -1.86 ≤ f6 / fa ≤ 1.05. By restricting the sixth lens L6, the optical system can have better imaging quality and lower sensitivity.

[0096] The central curvature radius of the object side of the sixth lens L6 near the paraxial region is R11, and the central curvature radius of the image side of the sixth lens L6 near the paraxial region is R12, satisfying the following relationship: -7.55 ≤ (R11 + R12) / (R11 - R12) ≤ 7.30. This specifies the shape of the sixth lens L6. When within the range, with the development of miniaturization, it is beneficial to correct problems such as axial chromatic aberration.

[0097] The on-axis thickness of the sixth lens L6 is T6, and the overall optical length of the imaging optical lens is TTL, satisfying the following relationship: 0.001 ≤ T6 / TTL ≤ 0.020. Within the range of this conditional expression, it is beneficial to achieve miniaturization.

[0098] The overall optical length of the imaging optical lens is TTL, and the image height at a 1.0 field of view of the imaging optical lens is IH, and they satisfy the following relationship: 13.90 ≤ TTL / IH ≤ 19.62. Within the range of this conditional expression, it is beneficial to achieve miniaturization.

[0099] The F-number FNO of the imaging optical lens is less than or equal to 3.500, thereby achieving a large aperture and good imaging performance of the imaging optical lens.

[0100] The imaging optical lens of the present invention will be described below with examples. The symbols described in each example are as follows. The units of focal length, on-axis distance, central radius of curvature, and on-axis thickness are mm.

[0101] f: refers to the effective focal length of the imaging optical lens;

[0102] fa: refers to the effective focal length of the imaging optical lens in the first state;

[0103] fb: refers to the effective focal length of the imaging optical lens in the second state;

[0104] TTL: overall optical length (the on-axis distance from the object side of the first prism P1 to the image plane Si), with the unit of mm;

[0105] F-number FNO: refers to the ratio of the effective focal length of the imaging optical lens to the entrance pupil diameter.

[0106] Next, the technical solution of the present invention will be specifically described with three embodiments.

[0107] (First Embodiment)

[0108] Figure 1 Shown is the imaging optical lens 10 in the first state of the first embodiment of the present invention;

[0109] Figure 1 Shown is the imaging optical lens 10 in the second state of the first embodiment of the present invention.

[0110] Tables 1, 2, and 3 show the design data of the imaging optical lens 10 of the first embodiment of the present invention.

[0111]

Table 1

[0112]

[0113] Table 2 shows the relevant optical parameters of the imaging optical lens 10 according to the first embodiment of the present invention in the first state and the second state respectively.

[0114] [Table 2]

[0115]

[0116]

[0117] Among them, the meanings of the symbols are as follows.

[0118] OBJ: Object;

[0119] S1: Aperture;

[0120] R: Radius of curvature at the center of the optical surface;

[0121] R1: Central radius of curvature of the object side surface of the first prism P1 at paraxial region;

[0122] Rf1: Central radius of curvature of the first reflecting surface of the first prism P1 at paraxial region; R2: Central radius of curvature of the image side surface of the first prism P1 at paraxial region;

[0123] R3: Central radius of curvature of the object side surface of the second lens L2 at paraxial region;

[0124] R4: Central radius of curvature of the image side surface of the second lens L2 at paraxial region;

[0125] R5: Central radius of curvature of the object side surface of the third lens L3 at paraxial region;

[0126] R6: Central radius of curvature of the image side surface of the third lens L3 at paraxial region;

[0127] R7: Central radius of curvature of the object side surface of the fourth lens L4 at paraxial region;

[0128] R8: Central radius of curvature of the image side surface of the fourth lens L4 at paraxial region;

[0129] R9: Central radius of curvature of the object side surface of the fifth lens L5 at paraxial region;

[0130] R10: Central radius of curvature of the image side surface of the fifth lens L5 at paraxial region;

[0131] R11: Central radius of curvature of the object side surface of the sixth lens L6 at paraxial region;

[0132] R12: Central radius of curvature of the image side surface of the sixth lens L6 at paraxial region;

[0133] R13: Central radius of curvature of the object side surface of the second prism P2 at paraxial region;

[0134] Rf2: The central radius of curvature of the second reflecting surface of the second prism P2 at the paraxial region;

[0135] Rf3: The central radius of curvature of the third reflecting surface of the second prism P2 at the paraxial region;

[0136] R14: The central radius of curvature of the image side surface of the second prism P2 at the paraxial region;

[0137] R15: The central radius of curvature of the object side surface of the optical filter GF at the paraxial region;

[0138] R16: The central radius of curvature of the image side surface of the optical filter GF at the paraxial region;

[0139] d: The on-axis thickness of the lens, the on-axis distance between the lenses;

[0140] T0: The on-axis distance from the aperture S1 to the object side surface of the first prism P1;

[0141] T1f: The on-axis distance from the object side surface of the first prism P1 to the first reflecting surface of the first prism P1;

[0142] Tf2: The on-axis distance from the first reflecting surface of the first prism P1 to the image side surface of the first prism P1;

[0143] T12: The on-axis distance from the image side surface of the first prism P1 to the object side surface of the second lens L2;

[0144] T2: The on-axis thickness of the second lens L2;

[0145] T23: The on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

[0146] T3: The on-axis thickness of the third lens L3;

[0147] T34: The on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

[0148] T4: The on-axis thickness of the fourth lens L4;

[0149] T45: The on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

[0150] T5: The on-axis thickness of the fifth lens L5;

[0151] T56: The on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

[0152] T6: The on-axis thickness of the sixth lens L6;

[0153] T67: The on-axis distance from the image side of the sixth lens L6 to the object side of the second prism P2;

[0154] T7f: The on-axis distance from the object side of the second prism P2 to the second reflecting surface of the second prism P2;

[0155] Tff: The on-axis distance from the second reflecting surface of the second prism P2 to the third reflecting surface of the second prism P2;

[0156] Tf8: The on-axis distance from the third reflecting surface of the second prism P2 to the image side of the second prism P2;

[0157] T8G: The on-axis distance from the image side of the second prism P2 to the object side of the optical filter GF;

[0158] TG: The on-axis thickness of the optical filter GF;

[0159] TGI: The on-axis distance from the image side of the optical filter GF to the image plane Si;

[0160] nd: The refractive index of the d-line (the d-line is green light with a wavelength of 550 nm);

[0161] nd1: The refractive index of the d-line of the first prism P1;

[0162] nd2: The refractive index of the d-line of the second lens L2;

[0163] nd3: The refractive index of the d-line of the third lens L3;

[0164] nd4: The refractive index of the d-line of the fourth lens L4;

[0165] nd5: The refractive index of the d-line of the fifth lens L5;

[0166] nd6: The refractive index of the d-line of the sixth lens L6;

[0167] nd7: The refractive index of the d-line of the second prism P2;

[0168] ndg: The refractive index of the d-line of the optical filter GF;

[0169] vd: Abbe number;

[0170] v1: Abbe number of the first prism P1;

[0171] v2: Abbe number of the second lens L2;

[0172] v3: Abbe number of the third lens L3;

[0173] v4: Abbe number of the fourth lens L4;

[0174] v5: Abbe number of the fifth lens L5;

[0175] v6: Abbe number of sixth lens L6;

[0176] v5: Abbe number of the second prism P2;

[0177] vg: Abbe number of the optical filter GF.

[0178] Wherein, d(∞) refers to the relevant parameters of each lens when the object distance between the object and the camera optical lens 10 is infinite, that is, when the camera optical lens 10 is in the first state; d(1000) refers to the relevant parameters of each lens when the object distance between the object and the camera optical lens 10 is 1000 mm, that is, when the camera optical lens 10 is in the second state.

[0179] Table 3 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0180]

Table 3

[0181]

[0182]

[0183] For convenience, the aspheric surface of each lens surface is represented by the aspheric surface shown in the following formula (1). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (1).

[0184] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0185] Among them, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance from the point on the aspheric curve to the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface with a distance r from the optical axis and the tangent plane at the vertex of the aspheric surface on the optical axis).

[0186] Figure 5 、 Figure 2 respectively show the axial aberration and chromatic aberration of magnification diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm after passing through the imaging optical lens 10 in the first state of the first embodiment. Figure 3 shows the field curvature and distortion diagrams of light with a wavelength of 555 nm after passing through the imaging optical lens 10 in the first state of the first embodiment. Figure 4 The field curvature S of

[0187] Figure 4 、 Figure 6 respectively show the axial aberration and chromatic aberration of magnification diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm after passing through the imaging optical lens 10 in the second state of the first embodiment. Figure 7 shows the field curvature and distortion diagrams of light with a wavelength of 555 nm after passing through the imaging optical lens 10 in the second state of the first embodiment.

[0188] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 12.249 mm, the image height IH of the full field of view (1.0 field of view) is 3.500 mm, and the field of view angle FOV in the diagonal direction of the full field of view (1.0 field of view) is 9.31°. The imaging optical lens 10 meets the design requirements of large aperture, long focal length, and miniaturization, and its axial and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0189] It can be understood that the image height of the 1.0 field of view refers to half of the diagonal length of the effective pixel area of the sensor; the FOV in the diagonal direction of the 1.0 field of view refers to the field of view angle corresponding to the effective pixel area of the sensor.

[0190] (Second Embodiment)

[0191] The symbol meanings in the second embodiment are the same as those in the first embodiment.

[0192] Figure 8 Shown is the imaging optical lens 20 in the first state of the second embodiment of the present invention;

[0193] Figure 9 Shown is the imaging optical lens 20 in the second state of the second embodiment of the present invention.

[0194] Tables 4, 5, and 6 show the design data of the imaging optical lens 20 of the second embodiment of the present invention.

[0195]

Table 4

[0196]

[0197]

[0198] Table 5 shows the relevant optical parameters of the imaging optical lens 20 of the second embodiment of the present invention in the first state and the second state, respectively.

[0199]

Table 5

[0200] Figure 13 In the first state f 41.76 40.16 In the second state 9.57 9.42 FOV 3.498 3.548 T34 0.050 0.389 T67 4.500 4.161

[0201] Table 6 shows the aspherical data of each lens in the imaging optical lens 20 of the second embodiment of the present invention.

[0202]

Table 6

[0203]

[0204]

[0205] FNO , Figure 10 respectively show the axial aberration and chromatic aberration of magnification diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm after passing through the imaging optical lens 20 in the first state of the second embodiment. Figure 11 shows the field curvature and distortion diagrams of light with a wavelength of 555 nm after passing through the imaging optical lens 20 in the first state of the second embodiment. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0206] Figure 12 , Figure 14 respectively show the axial aberration and chromatic aberration of magnification diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm after passing through the imaging optical lens 20 in the second state of the second embodiment. Figure 15 shows the field curvature and distortion diagrams of light with a wavelength of 555 nm after passing through the imaging optical lens 20 in the second state of the second embodiment.

[0207] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 11.932 mm, the image height IH at the full field of view (1.0 field of view) is 3.500 mm, and the field of view angle FOV in the diagonal direction of the full field of view (1.0 field of view) is 9.57°. The imaging optical lens 20 meets the design requirements of large aperture, long focal length, and miniaturization. Its axial and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0208] (Third Embodiment)

[0209] The symbol meanings in the third embodiment are the same as those in the first embodiment.

[0210] Figure 16 Shown is the imaging optical lens 30 in the first state according to the third embodiment of the present invention;

[0211] Figure 17 Shown is the imaging optical lens 30 in the second state according to the third embodiment of the present invention.

[0212] Tables 7, 8, and 9 show the design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[0213]

Table 7

[0214]

[0215]

[0216] Table 8 shows the relevant optical parameters of the imaging optical lens 30 according to the third embodiment of the present invention in the first state and the second state respectively.

[0217]

Table 8

[0218] Figure 21 In the first state f 43.70 41.29 In the second state 9.14 9.09 FOV 3.499 3.521 T34 0.064 0.390 T67 1.166 0.841 <http: / / www.example.com / <http: / / www.example.com /

[0219] Table 9 shows the aspherical data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0220]

Table 9

[0221]

[0222]

[0223] FNO 、 Figure 18 Show the axial aberration and chromatic aberration of magnification diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm after passing through the imaging optical lens 30 in the first state according to the third embodiment respectively. Figure 19It shows a schematic diagram of the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30 in the first state of the third embodiment. Figure 20 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0224] Figure 20 、 Figure 22 It respectively shows schematic diagrams of the axial chromatic aberration and magnification chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm after passing through the imaging optical lens 30 in the second state of the third embodiment. Figure 23 Figure 24 It shows a schematic diagram of the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30 in the second state of the third embodiment.

[0225] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 12.485 mm, the image height IH of the full field of view (1.0 field of view) is 3.500 mm, and the field of view angle FOV in the diagonal direction of the full field of view (1.0 field of view) is 9.14°. The imaging optical lens 30 meets the design requirements of large aperture, long focal length, and miniaturization. Its axial and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0226] Table 10 shows the values of the relevant conditional expressions and the values of the relevant parameters in each embodiment of the present invention.

[0227]

Table 10

[0228]

[0229] Those of ordinary skill in the art can understand that the above embodiments are specific implementation manners of implementing the present invention. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. An imaging optical lens, characterized in that, The imaging optical lens includes, in order from the object side to the image side: a first prism having refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having refractive power, and a second prism; a first reflecting surface is provided between the object side surface and the image side surface of the first prism, and a second reflecting surface and a third reflecting surface are provided between the object side surface and the image side surface of the second prism; the light rays emerging from the image side surface of the sixth lens sequentially pass through the object side surface of the second prism, the second reflecting surface, and the third reflecting surface and then emerge from the image side surface of the second prism; the lens group composed of the fourth lens, the fifth lens, and the sixth lens can move along the optical axis direction so that the imaging optical lens switches between a first state and a second state; Wherein, the focal length of the imaging optical lens in the first state is fa, the combined focal length of the fourth lens, the fifth lens, and the sixth lens is f456, the overall optical length of the imaging optical lens is TTL, and the on-axis distance from the image side surface of the sixth lens to the image plane in the first state is BF, and the following relational expressions are satisfied: -3.00 ≤ fa / f456 ≤ -2.00; 0.40 ≤ BF / TTL ≤ 0.

81.

2. The imaging optical lens according to claim 1, wherein The focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens at the paraxial region is R3, and the central curvature radius of the image side surface of the second lens at the paraxial region is R4, and the following relational expressions are satisfied: 0.30 ≤ f2 / (R3 - R4) ≤ 0.

60.

3. The imaging optical lens according to claim 1, wherein The on-axis thickness of the fourth lens is T4, the on-axis thickness of the fifth lens is T5, the on-axis thickness of the sixth lens is T6, the on-axis distance from the image side surface of the fourth lens to the object side surface of the fifth lens is T45, and the on-axis distance from the image side surface of the fifth lens to the object side surface of the sixth lens is T56, and the following relational expressions are satisfied: 4.00 ≤ (T4 + T5 + T6) / (T45 + T56) ≤ 5.

50.

4. The imaging optical lens according to claim 1, wherein: The central curvature radius of the object side surface of the fourth lens at the paraxial region is R7, and the central curvature radius of the image side surface of the fourth lens at the paraxial region is R8, and the following relational expressions are satisfied: 1.40 ≤ (R7 + R8) / (R7 - R8) ≤ 2.

80.

5. The imaging optical lens according to claim 1, wherein The object side surface of the first prism is convex at the paraxial region; The focal length of the first prism is f1, and the on-axis thickness of the first prism is T1, and the following relational expressions are satisfied: -1.68 ≤ f1 / fa ≤ 21.13; 0.14 ≤ T1 / TTL ≤ 0.

22.

6. The imaging optical lens according to claim 1, characterized in that, The object side surface of the second lens is convex at the paraxial region, and the image side surface of the second lens is convex at the paraxial region; The focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens at the paraxial region is R3, the central curvature radius of the image side surface of the second lens at the paraxial region is R4, and the on-axis thickness of the second lens is T2, and the following relational expressions are satisfied: 0.24 ≤ f2 / fa ≤ 0.66; -0.40 ≤ (R3 + R4) / (R3 - R4) ≤ 0.60; 0.01 ≤ T2 / TTL ≤ 0.11。 7. The imaging optical lens according to claim 1, wherein, The focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens at the paraxial region is R5, the central curvature radius of the image side surface of the third lens at the paraxial region is R6, and the on-axis thickness of the third lens is T3, and the following relational expressions are satisfied: -3.87 ≤ f3 / fa ≤ -1.56; -1.01 ≤ (R5 + R6) / (R5 - R6) ≤ 2.20; 0.002 ≤ T3 / TTL ≤ 0.030。 8. The imaging optical lens according to claim 1, wherein The object side surface of the fourth lens is convex at the paraxial region, and the image side surface of the fourth lens is concave at the paraxial region; The focal length of the fourth lens is f4, and the on-axis thickness of the fourth lens is T4, and the following relational expressions are satisfied: -0.34 ≤ f4 / fa ≤ -0.20; 0.001 ≤ T4 / TTL ≤ 0.028。 9. The imaging optical lens according to claim 1, wherein, The object side surface of the fifth lens is convex at the paraxial region; the image side surface of the fifth lens is concave at the paraxial region; The focal length of the fifth lens is f5, the central curvature radius of the object side surface of the fifth lens at the paraxial region is R9, the central curvature radius of the image side surface of the fifth lens at the paraxial region is R10, and the on-axis thickness of the fifth lens is T5, and the following relational expressions are satisfied: 0.41 ≤ f5 / fa ≤ 0.81; -5.71 ≤ (R9 + R10) / (R9 - R10) ≤ -2.11; 0.01 ≤ T5 / TTL ≤ 0.11。 10. The imaging optical lens according to claim 1, wherein The object side surface of the sixth lens is convex at the paraxial region; the image side surface of the sixth lens is concave at the paraxial region; The focal length of the sixth lens is f6, the central curvature radius of the object side surface of the sixth lens at the paraxial region is R11, the central curvature radius of the image side surface of the sixth lens at the paraxial region is R12, and the on-axis thickness of the sixth lens is T6, and the following relational expressions are satisfied: -1.86 ≤ f6 / fa ≤ 1.05; -7.55 ≤ (R11 + R12) / (R11 - R12) ≤ 7.30; 0.001 ≤ T6 / TTL ≤ 0.020。

Images