imaging optical lens

Abstract

The present invention discloses an imaging optical lens, which comprises a first optical element having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens, arranged sequentially from the object side to the image side. The object side of the first optical element is curved and convex near the axis, the image side of the first optical element is curved and concave near the axis, and a reflective surface is provided between the object side and the image side of the first optical element. The radius of curvature of the image side of the first optical element is R2, the Abbe number of the first optical element is vd1, the radius of curvature of the object side of the second lens is R3, and the following relationships are satisfied: vd1≧60.00, 4.50≦R2 / R3≦50.00. The imaging optical lens of the present invention can improve performance after tilting an aspherical prism, realize a large aperture periscope type design, and has good optical performance.

Description

[Technical Field]

[0001] The embodiments of the present invention relate to the field of optics, and more particularly to imaging optical lenses. [Background technology]

[0002] With the rapid development and widespread adoption of smartphones, camera research and development and design have also advanced rapidly. Furthermore, current electronic products are characterized by superior functionality and a thin, lightweight design, and miniaturized cameras with good image quality are now the mainstream in the market.

[0003] Telephoto cameras can meet consumers' needs to photograph specific targets, but the optical length of conventional telephoto cameras is too large and does not meet the design requirements for thin smartphones. However, the design of periscope-type telephoto cameras can significantly shorten the optical length of the imaging optical lens when the telephoto design is met. However, the optical performance of the imaging optical lens of conventional periscope-type telephotos still does not meet the demand. [Overview of the project] [Problems that the invention aims to solve]

[0004] The objective of the embodiments of the present invention is to provide an imaging optical lens that can realize a large aperture periscope type design and has good optical performance. [Means for solving the problem]

[0005] To solve the above technical problems, a first aspect of the present invention provides an imaging optical lens comprising a first optical member having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens, which are arranged sequentially from the object side toward the image side. The radius of curvature of the object side of the first optical member is R1, the radius of curvature of the image side of the first lens is R2, the Abbe number of the first optical member is vd1, the radius of curvature of the object side of the second lens is R3, and the following relationship is satisfied. vd1≧60.00, 4.50 ≤ R2 / R3 ≤ 50.00.

[0006] Selectively, the on-axial thickness of the second lens is d5, the focal length of the second lens is f2, and the following relationship is satisfied. -12.00 ≤ f² / d⁵ ≤ -10.00.

[0007] Selectively, the on-axial thickness of the fourth lens is d9, the on-axial distance between the fourth lens and the fifth lens is d10, and the following relationship is satisfied. 0.95 ≤ d9 / d10 ≤ 3.10.

[0008] Selectively, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the object side of the fourth lens is R8, satisfying the following relationship. -5.70 ≤ R7 / R8 ≤ -1.60.

[0009] Selectively, the focal length of the photographic optical lens is f, and the image height of the photographic optical lens satisfies the following relationship. f / IH ≤ 4.50.

[0010] Selectively, the focal length of the first optical element is f1, the focal length of the imaging optical lens is f, the radius of curvature of the object side surface of the first optical element is R1, and the on-axial thickness from the object side surface of the first optical element to the reflective surface is d1, satisfying the following relationship. 1.83 ≤ f1 / f ≤ 8.63, -22.32≦(R1+R2) / (R1-R2)≦2.86, 0.08 ≤ d1 / TTL ≤ 0.27.

[0011] Selectively, the second lens has negative refractive power, its object side is concave near the axis, and its image side is concave near the axis. The radius of curvature of the image side of the second lens is R4, the focal length of the second lens is f2, the on-axial thickness of the second lens is d5, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied. -1.83≦(R3+R4) / (R3-R4)≦6.10, -1.65 ≤ f² / f ≤ -0.49, 0.02 ≤ d5 / TTL ≤ 0.07.

[0012] Selectively, the third lens has a positive refractive power, its object side is convex near the axis, and its image side is concave near the axis. The radius of curvature of the object side of the third lens is R5, the radius of curvature of the image side of the third lens is R6, the focal length of the third lens is f3, the on-axial thickness of the third lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied. -1.51≦(R5+R6) / (R5-R6)≦-0.49, 0.15 ≤ f3 / f ≤ 0.50, 0.04 ≤ d7 / TTL ≤ 0.14.

[0013] Selectively, the fourth lens has a negative refractive power, its object side is convex near the axis, and its image side is convex near the axis. The radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, the focal length of the fourth lens is f4, the on-axial thickness of the fourth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied. -1.02≦f4 / f≦-0.24, 0.02 ≤ d9 / TTL ≤ 0.08.

[0014] Optionally, the fifth lens has a positive refractive power, its object side is concave near the axis, and its image side is concave near the axis. The radius of curvature of the object side of the fifth lens is R9, the radius of curvature of the image side of the fifth lens is R10, the focal length of the fifth lens is f5, the on-axis thickness of the fifth lens is d11, and the overall optical length of the imaging optical lens is TTL. -5.45 ≦ (R9 + R10) / (R9 - R10) ≦ -1.30, 0.32 ≦ f5 / f ≦ 1.16, 0.02 ≦ d11 / TTL ≦ 0.10.

[0015] Optionally, the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, the focal length of the sixth lens is f6, the on-axis thickness of the sixth lens is d13, and the overall optical length of the imaging optical lens is TTL. -208.82 ≦ (R11 + R12) / (R11 - R12) ≦ 17.08, -8.06 ≦ f6 / f ≦ 6.55, 0.01 ≦ d13 / TTL ≦ 0.04.

Advantages of the Invention

[0016] The beneficial effects of the present invention are as follows. The first optical member adopts an aspherical prism design, which can improve the optical performance of the imaging optical lens after the aspherical prism is tilted, realize anti-shake, and set the Abbe number of the aspherical prism, the shapes of its object side and image side, so as to realize a large-aperture periscope design and have good optical performance.

Brief Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings necessary for the description of the embodiments are briefly introduced below. However, the accompanying drawings described below are only some embodiments of the present invention, and it is obvious that those skilled in the art can obtain other drawings from these accompanying drawings without creative labor. [Figure 1] This is a schematic diagram of the imaging optical lens according to the first embodiment of the present invention. [Figure 2] Figure 1 is a schematic diagram showing the field curvature and distortion of the imaging optical lens. [Figure 3] Figure 1 is a schematic diagram of the magnification chromatic aberration of the imaging optical lens shown. [Figure 4] Figure 1 is a schematic diagram of the axial chromatic aberration of the imaging optical lens shown. [Figure 5] This is a schematic diagram of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] Figure 5 is a schematic diagram showing the field curvature and distortion of the imaging optical lens. [Figure 7] Figure 5 is a schematic diagram of the chromatic aberration of the imaging optical lens shown. [Figure 8] Figure 5 is a schematic diagram of the axial chromatic aberration of the imaging optical lens shown. [Figure 9] This is a schematic diagram of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] Figure 9 is a schematic diagram showing the field curvature and distortion of the imaging optical lens. [Figure 11] Figure 9 is a schematic diagram of the chromatic aberration of the imaging optical lens shown. [Figure 12] Figure 9 is a schematic diagram of the axial chromatic aberration of the imaging optical lens shown. [Modes for carrying out the invention]

[0018] To further clarify the object, technical solutions, and advantages of the embodiments of the present invention, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in each embodiment of the present invention for the reader to better understand. However, the technical solutions protected by the claims of the present invention can be realized without these technical details and the various changes and modifications based on the embodiments below.

[0019] Referring to the attached drawings, the technical solution of the present invention provides imaging optical lenses 10, 20, and 30 comprising a first optical member L1 having positive refractive power, a second lens L2 having negative refractive power, an aperture ST, a third lens L3 having positive refractive power, a fourth lens L4 having negative refractive power, a fifth lens L5 having positive refractive power, and a sixth lens L6 arranged sequentially from the object side to the image side. The object side surface of the first optical member L1 is curved, and the area near the axis is convex, and the image side surface of the first optical member L1 is curved, and the area near the axis is concave. A reflective surface is set between the object side surface and the image side surface of the first optical member. The radius of curvature of the image side surface of the first optical member L1 is R2, the Abbe number of the first optical member L1 is vd1, the radius of curvature of the object side surface of the second lens L2 is R3, and the following relation is satisfied. vd1≧60.00 (1) 4.50 ≤ R² / R³ ≤ 50.00 (2) Here, the first optical member L1 is formed by bonding a first prism PL and a first lens SL, the first lens SL being closer to the image side than the first prism PL, the object side of the first prism PL being the object side of the first optical member L1, the image side of the first lens SL being the image side of the first optical member L1, and the bonding surface RG being provided perpendicular to the optical axis of the imaging optical lenses 10, 20, and 30 and close to the image side of the first optical member L1. The first optical member L1 may be an integrally molded structure in which the first prism PL and the first lens PL are integrally molded. The object side of the first prism PL is aspherical. Preferably, the image side of the first prism PL is a standard surface, and the object side of the first lens SL is also a standard surface, thereby reducing the difficulty of bonding the first prism PL and the first lens SL. Selectively, the image side of the first lens SL may be spherical or aspherical.

[0020] If the first optical component L1 is a combination of a first prism PL and a first lens SL, then when the first prism PL rotates and / or tilts in a direction perpendicular to the optical axis, the aspherical design of the first prism PL and the spherical / aspherical design of the first lens SL can improve the optical performance of the first prism PL after tilting, thereby realizing OIS optical vibration isolation.

[0021] The object side surface of the first optical member L1 is convex near the axis, and the image side surface is concave near the axis. In this way, when the first optical member L1 rotates and / or tilts in a direction perpendicular to the optical axis, optical vibration isolation of the imaging optical lens 10 can be achieved, and this planar design and arrangement can improve the optical performance of the aspherical prism PL after tilting.

[0022] Conditional equation (1) defines the Abbe number vd1 of the first optical element L1, and contributes to reducing dispersion and improving luminous flux. Note that when the first optical element L1 is bonded to the first prism PL and the first lens SL, the first prism PL and the first lens SL are made of the same material.

[0023] Conditional equation (2) defines the range of the ratio between the image side curvature radius R2 of the first optical element L1 and the object side curvature radius R3 of the second lens, thereby controlling the shape of the image side of the first optical element L1 and the object side of the second lens L2, contributing to the smoothness of light ray propagation in the imaging optical lenses 10, 20, and 30 after the first prism PL is placed at an angle, and providing the system with good image quality and low sensitivity.

[0024] When several of the above conditions are met, by providing multiple lenses (L1, L2, L3, L4, L5, L6), specifying the shape and Abbe number vd1 of the first optical element L1, and defining the range of the ratio between the radius of curvature R2 of the image side surface of the first optical element L1 and the radius of curvature R3 of the object side surface of the second lens L2, a large aperture periscope type design of the imaging optical lenses 10, 20, and 30 can be realized, and good optical performance can be provided, especially for smart devices such as smartphones, tablets, smartwatches, and laptop computers.

[0025] Based on the above conditions and feasible functions, the characteristics of each lens can be further detailed as follows:

[0026] Preferably, the on-axial thickness of the second lens L2 is d5, the focal length of the second lens L2 is f2, and the following relationship is satisfied. -12.00 ≤ f² / d⁵ ≤ -10.00 (3) Conditional equation (3) defines the range of the ratio between the focal length f2 of the second lens L2 and its on-axial thickness d5. Under this limited condition, it helps to buffer the change in the incident angle of wide-angle light rays, allowing them to propagate smoothly within the lens group, while simultaneously maintaining the refractive power of the fifth lens L5, thereby improving chromatic aberration and enhancing image quality.

[0027] Preferably, the on-axial thickness of the fourth lens L4 is d9, the on-axial distance between the fourth lens L4 and the fifth lens L5 is d10, and the following relationship is satisfied. 0.95 ≤ d9 / d10 ≤ 3.10 (4) Conditional equation (4) defines the range of the ratio between the on-axial thickness d9 of the fourth lens L4 and the on-axial thickness d10 between the fourth lens L4 and the fifth lens L5. In this way, the on-axial thickness and air gap of each lens can be rationally distributed, which is advantageous in reducing the sensitivity of the imaging optical lenses 10, 20, and 30 and improving the production yield, while at the same time making the structure of the optical system more compact and realizing an ultra-thin design for the imaging optical lenses 10, 20, and 30.

[0028] Preferably, the radius of curvature of the object side of the fourth lens L4 is R7, and the radius of curvature of the image side of the fourth lens L4 is R8, satisfying the following relationship. -5.70 ≤ R7 / R8 ≤ -1.60 (5) Conditional equation (5) defines the range of the curvature radius of the side surface of the fourth lens L4. Within this range, the field curvature of the imaging optical lenses 10, 20, and 30 can be well balanced, the field curvature offset of the central field of view can be reduced to less than 0.01 mm, and the imaging effect can be improved.

[0029] Preferably, the focal length of the imaging optical lenses 10, 20, and 30 is f, the image height of the imaging optical lenses 10, 20, and 30 is IH, and the following relationship is satisfied. f / IH ≤ 4.50 (6) Conditional equation (6) defines the range of the ratio between the focal length f of the imaging optical lenses 10, 20, and 30 and its maximum image height IH, and it is explained that within this range, the imaging optical lenses 10, 20, and 30 satisfy the telephoto design.

[0030] Preferably, the focal length of the first optical member is f1, the focal length of the imaging optical lens is f, the radius of curvature of the object side surface of the first optical member is R1, the on-axial thickness of the first optical member L1 from the object side surface to the reflective surface is d1, and the total optical length of the imaging optical lenses 10, 20, and 30 is TTL, satisfying the following relationship. 1.83 ≤ f1 / f ≤ 8.63 (7) -22.32≦(R1+R2) / (R1-R2)≦-2.86 (8) 0.08 ≤ d1 / TTL ≤ 0.27 (9) Conditional equation (7) defines the range of the ratio between the focal length f1 of the first optical member L1 and the focal length f of the imaging optical lenses 10, 20, and 30, within which the ratio contributes to improving the optical performance of the imaging optical lenses 10, 20, and 30, and more preferably 2.93 ≤ f1 / f ≤ 6.91. Conditional equation (8) defines the shape of the object side surface and the image side surface of the first optical member L1, and contributes to improving the image formation quality of the imaging optical lenses 10, 20, and 30, and more preferably 13.95 ≤ (R1 + R2) / (R1 - R2) ≤ -3.57. Conditional equation (9) defines a range for the ratio of the on-axial thickness d1 of the first optical member L1 from the side surface of the object to the reflective surface to the total optical length TTL of the imaging optical lenses 10, 20, and 30, within which the ratio contributes to the design of the imaging optical lenses 10, 20, and 30 to be thinner, and more preferably 0.13 ≤ d1 / TTL ≤ 0.22.

[0031] The second lens L2 has a negative refractive power, its object side is convex near the axis, and its image side is concave near the axis. The object side and image side of the second lens L2 may have other concave and convex distributions.

[0032] The radius of curvature of the image side of the second lens L2 is R4, its focal length is f2, its on-axial thickness is d5, the total optical length of the imaging optical lenses 10, 20, and 30 is TTL, and the following relationship is satisfied. -1.83≦(R3+R4) / (R3-R4)≦6.10 (10) -1.65 ≤ f² / f ≤ -0.49 (11) 0.02 ≤ d5 / TTL ≤ 0.07 (12) Conditional equation (10) defines the shape of the second lens L2, and within this range, as the imaging optical lens develops to be ultra-thin and wide-angle, it is advantageous for correcting axial chromatic aberration, and more preferably 2.94 ≤ (R3 + R4) / (R3 - R4) ≤ 4.88. Conditional equation (11) defines the range of the ratio between the focal length f2 of the second lens L2 and the focal lengths of the imaging optical lenses 10, 20, and 30, and is advantageous for improving the optical performance of the imaging optical lenses 10, 20, and 30, and more preferably -1.03 ≤ f2 / f ≤ -0.61. Conditional equation (12) defines the range of the ratio between the axial thickness d5 of the second lens L2 and the optical total length TTL of the imaging optical lenses 10, 20, and 30, and within this range, it is advantageous for realizing ultra-thinness, and more preferably 0.03 ≤ d5 / TTL ≤ 0.06.

[0033] The third lens L3 has a positive refractive power, its object surface is convex near its axis, and its image surface is convex near its axis. The object surface and image surface of the third lens L3 may have other concave and convex distributions.

[0034] Preferably, the radius of curvature of the object side of the third lens L3 is R5, the radius of curvature of the image side of the third lens L3 is R6, the focal length of the third lens L3 is f3, the on-axial thickness of the third lens L3 is d7, the optical total length of the imaging optical lenses 10, 20, and 30 is TTL, and the following relationship is satisfied. 1.51≦(R5+R6) / (R5-R6)≦-0.49 (13) 0.15 ≤ f³ / f ≤ 0.50 (14) 0.04 ≤ d7 / TTL ≤ 0.14 (15) Conditional equation (13) defines the shape of the third lens L3, and within this limited range, it is advantageous for correcting axial chromatic aberration associated with the progress towards ultra-thin and wide-angle imaging optical lenses 10, 20, and 30, and more preferably -0.94 ≤ (R5 + R6) / (R5 - R6) ≤ -0.61. Conditional equation (14) defines the range of the ratio between the focal length f3 of the third lens L3 and the focal length f of the imaging optical lenses 10, 20, and 30, and within this range, it contributes to the reduction of aberration and the improvement of the image quality of the imaging optical lenses 10, 20, and 30, and more preferably 0.24 ≤ f3 / f ≤ 0.40. Conditional equation (15) defines the range of the ratio between the on-axial thickness d7 of the third lens L3 and the total optical length TTL of the imaging optical lenses 10, 20, and 30. Within the range of the conditional equation, it is advantageous for realizing an ultra-thin design of the imaging optical lenses 10, 20, and 30.

[0035] The fourth lens L4 has a negative refractive power, its object side is concave near its axis, and its image side is concave near its axis. The object side and image side of the fourth lens L4 may have other concave and convex distributions.

[0036] Preferably, the radius of curvature of the object side of the fourth lens L4 is R7, the radius of curvature of the image side of the fourth lens L4 is R8, the focal length of the fourth lens L4 is f4, the on-axial thickness of the fourth lens L4 is d9, the optical total length of the imaging optical lens 10 is TTL, and the following relationship is satisfied. -1.02≦f4 / f≦-0.24 (16) 0.02 ≤ d9 / TTL ≤ 0.08 (17) Conditional equation (16) defines a range for the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the imaging optical lenses 10, 20, and 30, contributing to the improvement of the performance of the optical system, and more preferably -0.64 ≤ f4 / f ≤ -0.30. Conditional equation (17) defines a range for the ratio of the on-axial thickness d9 of the fourth lens L4 to the optical total length TTL of the imaging optical lenses 10, 20, and 30, and within this parameter range, contributes to the ultra-thinning of the imaging optical lenses 10, 20, and 30, and more preferably 0.03 ≤ d9 / TTL ≤ 0.06.

[0037] The fifth lens L5 has a positive refractive power, its object side is convex near its axis, and its image side is concave near its axis. The object side and image side of the fifth lens L5 may have other concave and convex distributions.

[0038] Preferably, the radius of curvature of the object side of the fifth lens L5 is R9, the radius of curvature of the image side of the fifth lens L5 is R10, the focal length of the fifth lens L5 is f5, the on-axial thickness of the fifth lens is d11, and the optical total length of the imaging optical lenses 10, 20, and 30 is TTL. -5.45≦(R9+R10) / (R9-R10)≦-1.30 (18) 0.32 ≤ f5 / f ≤ 1.16 (19) 0.02 ≤ d11 / TTL ≤ 0.10 (20) Conditional equation (18) defines the shape of the fifth lens L5, and within the range defined by this conditional equation, it is advantageous for correcting aberrations such as off-axis angle of view, and more preferably -3.41 ≤ (R9 + R10) / (R9 - R10) ≤ -1.63. Conditional equation (19) defines the range of the ratio between the focal length f5 of the fifth lens L5 and the focal length f of the imaging optical lenses 10, 20, and 30, and within the range of this conditional equation, it is advantageous for reducing aberrations and improving image quality, and more preferably 0.51 ≤ f5 / f ≤ 0.93. Conditional equation (20) defines the range of the ratio between the on-axial thickness d11 of the fifth lens L5 and the optical total length TTL of the imaging optical lenses 10, 20, and 30, and within this range, it is advantageous for making the imaging optical lenses 10, 20, and 30 ultra-thin, and more preferably 0.04 ≤ d11 / TTL ≤ 0.08.

[0039] The sixth lens L6 has a positive refractive power, its object side is convex near the axis, and its image side is concave near the axis. The sixth lens L6 may also have a negative refractive power, and the object side and image side of the sixth lens L6 may have other concave and convex distributions.

[0040] Preferably, the radius of curvature of the object side of the sixth lens L6 is R11, the radius of curvature of the image side of the sixth lens L6 is R12, the focal length of the sixth lens L6 is f6, the on-axial thickness of the sixth lens L6 is d13, and the optical total length of the imaging optical lenses 10, 20, and 30 is TTL. -208.82≦(R11+R12) / (R11-R12)≦17.08 (21) -8.06 ≤ f6 / f ≤ 6.55 (22) 0.01 ≤ d13 / TTL ≤ 0.04 (23) Conditional equation (21) defines the shape of the sixth lens L6, and within that range, the radius of curvature of the object side and image side of the sixth lens L6 has a wide range of choice, which helps to arbitrarily set the parameters according to the demands of actual production processing, and more preferably -130.51 ≤ (R11 + R12) / (R11 - R12) ≤ 13.67. Conditional equation (22) defines the range of the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the imaging optical lenses 10, 20, and 30, and within that range, the sixth lens L6 has an appropriate negative refractive power, which contributes to the reduction of system aberrations, as well as to the ultra-thinning and wide-angle of the lens, and more preferably -5.04 ≤ f6 / f ≤ 5.64. Conditional equation (23) defines the range of the ratio between the axial thickness d13 of the sixth lens L6 and the total optical length TTL of the imaging optical lenses 10, 20, and 30, and contributes to the ultra-thinning of the imaging optical lenses 10, 20, and 30, more preferably 0.02 ≤ d13 / TTL ≤ 0.04.

[0041] Preferably, the aperture value FNO of the imaging optical lenses 10, 20, and 30 satisfies the following relationship. FNO ≤ 2.2 (24) Thus, this is advantageous for realizing the large aperture design of the imaging optical lenses 10, 20, and 30.

[0042] In the present invention, the material of the first optical member L1 is glass, and the materials of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all resin. In other feasible examples, the first optical member L1 and each lens may be made of other materials.

[0043] In the present invention, an optical element such as an optical filter GF is provided between the sixth lens L6 and the image plane Si, and the optical filter GF may be a cover glass or an optical filter. In other examples, the optical filter GF may be provided at other positions.

[0044] The imaging optical lens 10 according to the present invention can improve the performance after tilting the aspherical prism, realize a large aperture periscope type design, and has good optical performance.

[0045] The imaging optical lens according to the present invention will be described below using examples. The reference numerals used in each example are as follows. The units for focal length, axial distance, central radius of curvature, axial thickness, inflection point position, and stationary point position are in mm. TTL: Optical total length (the on-axial distance from the side of the object to the image plane Si of the first lens L1), in units of mm. Aperture value FNO: This is the ratio of the effective focal length to the entrance pupil diameter of the imaging optical lens.

[0046] Preferably, the object side and / or image side of the lens are also provided with inflection points and / or stationary points to satisfy the requirements for high-quality imaging. Next, the technical solution of the present invention will be specifically described using three embodiments, and comparative embodiments will be presented as reference explanations to show that the technical effects of the present invention cannot be realized when the range of the above-mentioned conditional expression is exceeded.

[0047] First Embodiment Figure 1 is a schematic diagram of the configuration of the imaging optical lens 10 in the first embodiment. The design data for the imaging optical lens 10 in the first embodiment of the present invention is shown below.

[0048] Table 1 shows the radius of curvature R of the object side and image side of the first lens L1 to the sixth lens L6 constituting the imaging optical lens 10 in the first embodiment of the present invention, the on-axial thickness of the lens, the on-axial distance d between the lenses, the refractive index nd, and the Abbe number vd. Table 2 shows the conicity coefficient k and asphericity coefficient of the imaging optical lens 10. In this embodiment, the units of distance, radius, and thickness are all millimeters (mm). JPEG0007874732000001.jpg166163

[0049] The meanings of each of the symbols above are as follows: R: This is the radius of curvature of the optical surface. ST: This refers to the aperture. R1: This is the side surface of the first optical component L1. RF: This is the reflective surface of the first optical element L1. RG: This is the bonding surface of the first optical component L1. R2: This is the image side of the first optical element L1. R3: This is the object side of the second lens L2. R4: This is the image side of the second lens L2. R5: This is the object side of the third lens L3. R6: This is the image side of the third lens, L3. R7: This is the object side of the fourth lens L4. R8: This is the image side of the fourth lens, L4. R9: This is the object side of the fifth lens L5. R10: This is the image side of the fifth lens, L5. R11: This is the object side of the sixth lens L6. R12: This is the image side of the sixth lens, L6. R13: This is the side surface of the optical filter GF. R14: This is the image side of the optical filter GF. d: This is the axial thickness of the lens or the axial distance between adjacent lenses. d0: The on-axis distance from aperture ST to the side of the object on the first lens L1. d1: This is the on-axial thickness from the side surface of the first lens L1 to the reflective surface of the aspherical prism. d2: This is the on-axial thickness of the first optical component from the reflective surface to the bonding surface. d3: This is the on-axial thickness from the bonding surface to the image side of the first optical component (the on-axial thickness of the first lens SL). d4: This is the on-axis distance from the image side of the first optical element L1 to the object side of the second lens L2. d5: This is the on-axial thickness of the second lens L2. d6: This is the on-axis distance from the image side of the second lens L2 to the object side of the third lens L3. d7: This is the axial thickness of the third lens L3. d8: This is the on-axis distance from the object side of the third lens L3 to the image side of the fourth lens L4. d9: This is the on-axial thickness of the fourth lens L4. d10: This is the on-axis distance from the image side of the fourth lens L4 to the object side of the fifth lens L5. d11: This is the on-axial thickness of the fifth lens L5. d12: This is the on-axis distance from the image side of the fifth lens L5 to the object side of the sixth lens L6. d13: This is the axial thickness of the sixth lens, L6. d14: This is the on-axis distance from the image side of the sixth lens L6 to the object side of the optical filter GF. d15: This is the on-axial thickness of the optical filter GF. d16: This is the on-axis distance from the image side of the optical filter GF to the image plane Si. nd: This is the refractive index of the d line. nd1: This is the refractive index of the first optical element L1. nd2: This is the refractive index of the second lens L2. nd3: This is the refractive index of the third lens, L3. nd4: This is the refractive index of the fourth lens, L4. nd5: This is the refractive index of the fifth lens, L5. nd6: This is the refractive index of the sixth lens, L6. ndg: This is the refractive index of the GF optical filter. vd is the Abbe number. vd1: This is the Abbe number of the first optical element L1. vd2: This is the Abbe number of the second lens L2. vd3: This is the Abbe number of the third lens L3. vd4: This is the Abbe number of the fourth lens L4. vd5: This is the Abbe number of the fifth lens L5. vd6: This is the Abbe number of the sixth lens, L6. vg: This is the Abbe number of the optical filter GF. JPEG0007874732000002.jpg245163JPEG0007874732000003.jpg195163

[0050] In addition, for the aspherical surfaces of each lens in the present embodiment, an aspherical surface represented by the following formula (25) is used. However, the specific form of the following formula (25) is just an example, and in reality, it is not limited to the aspherical polynomial form represented by the formula (25). 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 (25) Here, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between the point at r from the optical axis on the aspherical surface and the cross-section tangent to the vertex on the optical axis of the aspherical surface).

[0051] FIG. 2 shows a schematic diagram of spherical aberration, field curvature, and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 10 of the first embodiment. FIG. 3 shows a schematic diagram of lateral chromatic aberration after light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm passes through the imaging optical lens  10 of the first embodiment. FIG. 4 shows a schematic diagram of axial chromatic aberration after light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm passes through the imaging optical lens 10 of the first embodiment.

[0052] In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 8.224 millimeters, an image height IH of the entire field of view of 3.594 millimeters, and an angle of view FOV of 24.49°. The imaging optical lens 10 improves the optical performance after tilting the first optical member L1, realizes anti-vibration and a large aperture periscope design, has good optical performance, sufficiently corrects axial and off-axis chromatic aberrations, and has excellent optical characteristics.

[0053] [[ID= Figure 5 is a schematic diagram of the configuration of the imaging optical lens 20 in the second embodiment, and the meaning of the reference numerals is the same as in the first embodiment. Tables 3 and 4 show the design data for the imaging optical lens 20 in the second embodiment of the present invention. JPEG0007874732000004.jpg167163 JPEG0007874732000005.jpg238163JPEG0007874732000006.jpg195163

[0054] Figure 6 shows a schematic diagram of astigmatism, field curvature, and distortion after passing light with a wavelength of 546 nm through the imaging optical lens 20 of the second embodiment. Figure 7 shows a schematic diagram of lateral chromatic aberration after passing light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm through the imaging optical lens 20 of the second embodiment. Figure 8 shows a schematic diagram of axial chromatic aberration after passing light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm through the imaging optical lens 20 of the second embodiment.

[0055] In this embodiment, the imaging optical lens 20 has an entrance pupil diameter of 8.7292 mm, a total field of view image height IH of 3.728 mm, and a diagonal field of view of 24.07°. The imaging optical lens 20 improves the optical performance after tilting the first optical member L1, achieves vibration damping and a large aperture periscope design, has good optical performance, has sufficiently corrected on-axis and off-axis chromatic aberration, and possesses excellent optical characteristics.

[0056] Third Embodiment Figure 9 is a schematic diagram of the configuration of the imaging optical lens 30 in the third embodiment. The third embodiment is basically the same as the first embodiment, and the meaning of the reference numerals is the same as in the first embodiment. However, only the differences are listed below. Tables 5 and 6 show the design data for the imaging optical lens 30 in the third embodiment of the present invention. JPEG0007874732000007.jpg167163JPEG0007874732000008.jpg238163JPEG0007874732000009.jpg195163

[0057] Figure 10 is a schematic diagram of astigmatism, field curvature, and distortion after passing light with a wavelength of 546 nm through the imaging optical lens 30 of the third embodiment. Figure 11 is a schematic diagram of lateral chromatic aberration after passing light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm through the imaging optical lens 30 of the third embodiment. Figure 12 is a schematic diagram of axial chromatic aberration after passing light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm through the imaging optical lens 30 of the third embodiment.

[0058] In this embodiment, the imaging optical lens 30 has an entrance pupil diameter of 6.99 mm, a total field of view image height of 3.353 mm, and a diagonal field of view of 24.23°. The imaging optical lens 30 improves the optical performance after tilting the first optical element L1, achieves vibration damping and a large aperture periscope design, and has excellent optical characteristics in which on-axis and off-axis chromatic aberration is sufficiently corrected.

[0059] Table 7, shown later, shows that the various numerical values ​​in each embodiment 1, 2, and 3 correspond to the parameters defined in the conditional expression. JPEG0007874732000010.jpg167164

[0060] The imaging optical lenses provided by embodiments of the present invention have been described in detail above. This specification has described the principles and embodiments of the present invention using specific examples. The above description of embodiments is intended to help understand the concept of the present invention, and there may be changes in specific embodiments and scope of application. For this reason, the contents of this specification should not be understood as limiting the present invention.

Claims

1. It is an imaging optical lens, The imaging optical lens is composed of a first optical element having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens, which are arranged sequentially from the object side to the image side. An imaging optical lens characterized in that the object side surface of the first optical element is curved and the side near the axis is convex, the image side surface of the first optical element is curved and the side near the axis is concave, a reflective surface is placed between the object side surface and the image side surface of the first optical element, the radius of curvature of the image side surface of the first optical element is R2, the Abbe number of the first optical element is vd1, the radius of curvature of the object side surface of the second lens is R3, and the following relation is satisfied. vd1 ≥ 60.00, 4.50 ≤ R2 / R3 ≤ 50.

00.

2. The imaging optical lens according to claim 1, characterized in that the on-axial thickness of the second lens is d5, the focal length of the second lens is f2, and the following relation is satisfied. -12.00 ≤ f² / d⁵ ≤ -10.

00.

3. The imaging optical lens according to claim 1, characterized in that the on-axial thickness of the fourth lens is d9, the on-axial distance between the fourth lens and the fifth lens is d10, and the following relation is satisfied. 0.95 ≤ d9 / d10 ≤ 3.

10.

4. The imaging optical lens according to claim 1, characterized in that the radius of curvature of the object side surface of the fourth lens is R7, the radius of curvature of the image side surface of the fourth lens is R8, and the following relation is satisfied. -5.70 ≤ R7 / R8 ≤ -1.

60.

5. The imaging optical lens according to claim 1, characterized in that the focal length of the imaging optical lens is f, the maximum image height of the imaging optical lens is IH, and the following relation is satisfied. f / IH≧4.

50.

6. The imaging optical lens according to claim 1, characterized in that the focal length of the first optical member is f1, the focal length of the imaging optical lens is f, the radius of curvature of the object side surface of the first optical member is R1, the on-axial thickness from the object side surface of the first optical member to the reflective surface is d1, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied. 1.83 ≤ f1 / f ≤ 8.63, -22.32≦(R1+R2) / (R1-R2)≦-2.86, 0.08 ≤ d1 / TTL ≤ 0.

27.

7. The imaging optical lens according to claim 1, characterized in that the object side surface of the second lens is convex near the axis, the image side surface of the second lens is concave near the axis, the radius of curvature of the image side surface of the second lens is R4, the focal length of the second lens is f2, the on-axial thickness of the second lens is d5, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied. -1.83≦(R3+R4) / (R3-R4)≦6.10, -1.65 ≤ f² / f ≤ -0.49, 0.02 ≤ d5 / TTL ≤ 0.

07.

8. The imaging optical lens according to claim 1, characterized in that the object side surface of the third lens is convex near the axis, the image side surface of the third lens is convex near the axis, the radius of curvature of the object side surface of the third lens is R5, the radius of curvature of the image side surface of the third lens is R6, the focal length of the third lens is f3, the on-axial thickness of the third lens is d7, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied. -1.51≦(R5+R6) / (R5-R6)≦0.49, 0.15 ≤ f³ / f ≤ 0.50, 0.04 ≤ d7 / TTL ≤ 0.

14.

9. The imaging optical lens according to claim 1, characterized in that the object side surface of the fourth lens is concave near the axis, the image side surface of the fourth lens is concave near the axis, the focal length of the fourth lens is f4, the on-axial thickness of the fourth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied. -1.02 ≤ f⁴ / f ≤ -0.24, 0.02 ≤ d9 / TTL ≤ 0.

08.

10. The imaging optical lens according to claim 1, characterized in that the object side surface of the fifth lens is convex near the axis, the image side surface of the fifth lens is concave near the axis, the radius of curvature of the object side surface of the fifth lens is R9, the radius of curvature of the image side surface of the fifth lens is R10, the focal length of the fifth lens is f5, the on-axial thickness of the fifth lens is d11, and the total optical length of the imaging optical lens is TTL. -5.45≦(R9+R10) / (R9-R10)≦-1.30, 0.32 ≤ f5 / f ≤ 1.16, 0.02 ≤ d11 / TTL ≤ 0.

10.

11. The imaging optical lens according to claim 1, characterized in that the object side surface of the sixth lens is convex near the axis, the image side surface of the sixth lens is concave near the axis, the radius of curvature of the object side surface of the sixth lens is R11, the radius of curvature of the image side surface of the sixth lens is R12, the focal length of the sixth lens is f6, the on-axial thickness of the sixth lens is d13, and the total optical length of the imaging optical lens is TTL. -208.82≦(R11+R12) / (R11-R12)≦17.08, -8.06 ≤ f 6 / f ≤ 6.55, 0.01 ≤ d13 / TTL ≤ 0.

04.

12. The imaging optical lens according to claim 1, wherein the first optical member comprises a first prism and a first lens bonded together, the first lens is closer to the image side than the first prism, the object side of the first prism is the object side of the first optical member, the image side of the first lens is the image side of the first optical member, and the bonding surface is provided perpendicular to the optical axis of the imaging optical lens and close to the image side of the first optical member.

13. The imaging optical lens according to claim 1, characterized in that the first optical member has an integrally molded structure.

14. The imaging optical lens according to claim 1, characterized in that the first optical member is made of glass.

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